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ICAS 2022 BOOK OF ABSTRACTS

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Abstract

The ICAS 2022 Conference will be attended by the economic authorities such as the 8 big companies from Banja Luka, Prijedor, Stanari, Kotor Varos, Laktasi, Nova Topola, MINISTRY OF SCIENTIFIC AND TECHNOLOGICAL DEVELOPMENT, HIGHER EDUCATION AND INFORMATION SOCIETY AND INFORMATION SOCIETY, REPUBLIC OF SRPSKA, REPUBLIC OF SRPSKA and the City of Banja Luka. With 164 papers from 10 countries, ICAS achieved a goal to be the first international conference for applied science in the Republic of Srpska, Bosnia and Herzegovina. Having a strong belief that the ICAS conference has already achieved international standards in Romania, we also believe that bringing such a conference to Banja Luka can contribute to the linking of all the Balkan countries, the EU, and the countries all over the world, in scientific as well as economic and cultural sense. Prof. dr Tihomir Latinović, University of Banja Luka, Faculty of Mechanical Engineering, e-mail:tihomirlatinovic@mf.unibl.org, tihomirlatinovic@live.com
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10th INTERNATIONAL CONFERENCE OF APPLIED SCIENCE
Supported by:
MINISTRY OF SCIENTIFIC AND TECHNOLOGICAL DEVELOPMENT, HIGHER EDUCATION
AND INFORMATION SOCIETY, REPUBLIC OF SRPSKA AND
CITY OF BANJA LUKA
Organizer and publisher:
UNIVERSITY OF BANJA LUKA
FACULTY OF MECHANICAL ENGINEERING
Co-organizer:
UNIVERSITY OF TIMISOARA
FACULTY OF ENGINEERING HUNEDOARA
Sponsored by:
City of Banja Luka
ArcelorMittal, Prijedor
EFT Stanari, Stanari
METAL MAS d.o.o Teslic
EKO TOPLANE, Banja Luka
Elas Metalexpert, Banja Luka
Mistrade, Nova Topola
Simtehnics, Kotor Varos
For publisher:
Prof. Aleksandar Milašinović, PhD
Editor-in-chief:
Prof. Tihomir Latinović, PhD
Design:
Ass. Prof. Ljilja Šikman, PhD
Publisher
Grafid, Banja Luka
© No part of this book may be photocopied, reprinted or reproduced in any other way.
All rights reserved by the publisher.
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University of Banja Luka
Faculty of Mechanical Engineering
and
Polytechnic University of Timisoara
Faculty of Engineering, Hunedoara
ICAS 2022 CONFERENCE
BOOK OF ABSTRACTS
Banja Luka 2022
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The ICAS Conference was launched in 2013 through a project organized between
Interdisciplinary Scientific Values for Education and Research Society (SCIVERS), Wuhan
University, China, Huazhong University of Science and Technology of China and the
Polytechnic University of Timisoara.
The Conference had an international character from the start and conference papers
were published in the IOP Conf. Series: Materials Science and Engineering, the journal
indexed in the Thomson list. The organizers of the ICAS 2014 included "Henri Coanda"
Air Force Academy from Brasov, Romania and several companies such as Arcelor Mittal
SA, SC Eurosport DHS SA, etc.
The Faculty of Mechanical Engineering, University of Banja Luka was added to the
list as one of the organizers of the ICAS 2017 which was held in Hunedoara, Romania,
and it actively participated in its work.
Before the ICAS 2017 Conference took place, the Faculty of Mechanical Engineering
in Banja Luka and the Polytechnic University of Timisoara established a Memorandum
of Understanding and a special agreement that specified the organization of the
Conference. According to those two documents, the Conference should be held every
year, with the conference venues alternating between two countries, one year in
Romania and the following one in Banja Luka. The ICAS 2018 Conference will be held in
Banja Luka.
125 researchers from seven countries (France, USA, Germany, Slovakia, Serbia,
Bosnia and Herzegovina and Moldova) took part in the last conference. During the three
conference days, there were five plenary lectures and 125 scientific papers orally
presented.
All members of the Scientific Committee have more than 3 research papers
published on the ISI lists, with some having over 10. Each section is chaired by two
professors, one from Romania and one from the Faculty of Mechanical or Electrical
Engineering, University of Banja Luka.
The ICAS 2022 Conference will be attended by the economic authorities such as the
8 big companies from Banja Luka, Prijedor, Stanari, Kotor Varos, Laktasi, Nova Topola,
MINISTRY OF SCIENTIFIC AND TECHNOLOGICAL DEVELOPMENT, HIGHER EDUCATION
AND INFORMATION SOCIETY AND INFORMATION SOCIETY, REPUBLIC OF SRPSKA ,
REPUBLIC OF SRPSKA and the City of Banja Luka. With 106 papers from 10 countries,
ICAS achieved a goal to be the first international conference for applied science in the
Republic of Srpska, Bosnia and Herzegovina.
Having a strong belief that the ICAS conference has already achieved international
standards in Romania, we also believe that bringing such a conference to Banja Luka can
contribute to the linking of all the Balkan countries, the EU and the countries all over the
world, in scientific as well as economic and cultural sense.
Prof. dr Tihomir Latinović, University of Banja Luka, Faculty of Mechanical
Engineering, e-mail:tihomirlatinovic@mf.unibl.org, tihomirlatinovic@live.com
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ORGANIZING COMMITTEE
Presidents
Milašinović Aleksandar, University of Banja Luka
Tirian Ovidiu, University Politehnica Timisoara
Conference Coordinators
Borojević Stevo, University of Banja Luka
Ratiu Sorin, University Politehnica Timisoara
Program Coordinators
Tanasić Zorana, University of Banja Luka
Kiss Imre, University Politehnica Timisoara
Chairman:
Tihomir Latinović, University of Banja Luka, Republic of Srpska, B&H
Video-conferences Coordinators
Grahovac Zoran, University of Banja Luka
Muscalagiu Ionel, University Politehnica Timisoara
Chairmen of Plenary Speakers Session
Golubovic Bugarski Valentina, University of Banja Luka
Bordeasu Ilare, University Politehnica Timisoara
Chairmen of Fundamental Sciences Session
Vojvodic Biljana, University of Banja Luka
Bistrian Diana, University Politehnica Timisoara
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Chairmen of Computers Engineering Session
Tihomir Latinovic, University of Banja Luka
Panoiu Manuela, University Politehnica Timisoara
Chairmen of Electrical Engineering Session
Prša Miroslav, University of Novi Sad
Deaconu Sorin, University Politehnica Timisoara
Chairmen of Mechanical Engineering Session
Rogić Miroslav, University of Banja Luka
Pinca-Bretotean Camelia, University Politehnica Timisoara
Chairmen of Materials Session
Dobras Dragoslav, University of Banja Luka
Ardelean Erika, University Politehnica Timisoara
Members:
Aleksandar Milašinović, University of Banja Luka
Tihomir Latinović, University of Banja Luka
Mirko Dobrnjac, University of Banja Luka
Stevo Borojević, University of Banja Luka
Zorana Tanasić, University of Banja Luka
Zoran Grahovac, University of Banja Luka
Valentina Golubović Bugarski, University of Banja Luka
Biljana Vojvodić, University of Banja Luka
Branko Blanuša, University of Banja Luka
Miroslav Rogić, University of Banja Luka
Dragoslav Dobraš, University of Banja Luka
Mladen Todić, University of Banja Luka
Branislav Sredanović, University of Banja Luka
Dijana Đeorđić, University of Banja Luka
Jovica Ilić, University of Banja Luka
Goran Jotić, University of Banja Luka
Saša Laloš, University of Banja Luka
Tihomir Mačkić, University of Banja Luka
Milisav Marković, University of Banja Luka
Ivana Savković, University of Banja Luka
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Jovan Škundrić, University of Banja Luka
Sanja Maglov, University of Banja Luka
Boro Marić, University of Banja Luka
Nedeljka Putnik Sladojević, University of Banja Luka
Jelena Rokvić, University of Banja Luka
Ratiu Sorin, University Politehnica Timisoara
Kiss Imre, University Politehnica Timisoara
Muscalagiu Ionel, University Politehnica Timisoara
Bordeasu Ilare, University Politehnica Timisoara
Bistrian Diana, University Politehnica Timisoara
Panoiu Manuela, University Politehnica Timisoara
Deaconu Sorin, University Politehnica Timisoara
Pinca-Bretotean Camelia, University Politehnica Timisoara
Ardelean Erika, University Politehnica Timisoara
Abrudean Cristian, University Politehnica Timisoara
Ardelean Marius, University Politehnica Timisoara
Benea Laura, University Politehnica Timisoara
Birtok-Baneasa Corneliu, University Politehnica Timisoara
Dinis Corina, University Politehnica Timisoara
Gherman Lucian, University Politehnica Timisoara
Popa Gabriel, University Politehnica Timisoara
Popa Mihaela, University Politehnica Timisoara
Socalici Ana, University Politehnica Timisoara
Josan Ana, University Politehnica Timisoara
Berdie Adela, University Politehnica Timisoara
Rob Raluca, University Politehnica Timisoara
Serban Sorina, University Politehnica Timisoara
Gaianu Oana, University Politehnica Timisoara
Secretariat:
Jelena Rokvić, University of Banja Luka, Republic of Srpska, B&H
Nedeljka Putnik-Sladojević, University of Banja Luka, Republic of Srpska, B&H
Berdie Adela, University Politehnica Timisoara, Romania
Boro Marić, University of Banja Luka, Republic of Srpska, B&H
Josan Ana, University Politehnica Timisoara
Rob Raluca, University Politehnica Timisoara, Romania
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Honorary Committee:
Srdan Rajcevic, Ministry of Scientific and Technological Development, Higher Education
and Information Society
Dragoljub Mirjanic, Academy of Science and Arts of Republic of Srpska
Draško Stanivuković, Mayor of Banja Luka
Mladen Jelaca, Director of Arcelor Mittal S.A., Prijedor
Savo Markovic, Director of Thermal Power Plant Stanari
Dragiša Marković, METAL MAS d.o.o Teslic
Stipo Maric, SIM TECHNIK D.O.O.
Željko Petrovic, Elas Komerc D.O.O.
Eko toplane, Banja Luka, Vladislav Jovišević
Posavljak Strain, Vice-Rector of the University of Banja Luka for Teaching and Student
Affairs
Tirian Ovidiu, University Politehnica Timisoara
Popoviciu Octavian Mircea, Academy of Romanian Scientists
Pacuretu Anton, Ambassador of Romania in Bosnia and Herzegovina
Harau Carmen, S.C. Micro-Mega HD S.A
Pawar Dayanada Rao, C.E.O. Arcelor Mittal S.A.
Xi Yang, S.C. Eurosport DHS S.A.
SCIENTIFIC COMMITTEE:
Chair:
Lemle Ludovic Dan, Polytechnic University of Timisoara, Romania
Members:
Mijakovski Vladimir, University St. Kliment Ohridski-Bitola
Emeric Szabo, University Szent Istvan
Alić Izet, Univerzitet u Tuzli
Emir Skejić, Univerzitet u Tuzli
Nerdina Mehinović, Univerzitet u Tuzli
Nermin Sarajlić, Univerzitet u Tuzli
Topčić Alan, Univerzitet u Tuzli
Sorin Aurel Moraru, Transilvania University of Brașov
Lindita Mukli, Aleksander Moisiu University
Cornelia Anghel Drugarin, Babes-Bolyai University
Doina Frunzaverde, Babes-Bolyai University
Gilbert Girlich, Babes-Bolyai University
Nedelcu Dorian, Babes-Bolyai University
Hennry TAUBMANN , C3 Prozess und Analysentechnik Gmbh
9
Szabo Atila, Dunajvaros University
Kaouka Alaeddine, Ecole Normale Superieure de Laghouat
Vasile Horga , Gheorghe Asachi University of Iassy
Jalba Klaus , Hochschule Neu-Ulm
Djula Mester, Hungarian Academy
Hasan KIVRAK , Istanbul Technical University
Arkhypova Liudmyla, Ivano-Frankivsk National Technical University of Oil and Gas
Kopei Volodymyr, Ivano-Frankivsk National Technical University of Oil and Gas
Lesya Shkitsa, Ivano-Frankivsk National Technical University of Oil and Gas
Onysko Oleh, Ivano-Frankivsk National Technical University of Oil and Gas
Panchuk Vitalii, Ivano-Frankivsk National Technical University of Oil and Gas
Livia Dana Beju, Lucian Blaga University of Sibiu
Ahmed Ould Brahim , Mohammed V University
Souad Abderafi, Mohammed V University
Huseyin HAKLI , Necmettin Erbakan University
Szabo Gyla, Obuda University
Suman Sabrina, Polytechnic of Rijeka
Tomljenovic Ljerka, Polytechnic of Rijeka
Ribaric Eda, Polytechnic of Rijeka
Nemedi Imre, Polytechnical Engineering College of Subotica
Dr. Eng. Marcin Pelic , Poznan University of Technology
Magdalena DIERING, Poznan University of Technology
Remigiusz Labudzki, Poznan University of Technology
Patricia Carolina Pedrali, Regional University of Northwestern Rio Grande do Sul
Orwat Justyna, Silesian University of Technology
Holubek Radovan, Slovak University of Technology in Bratislava
Ružarovský Roman, Slovak University of Technology in Bratislava
Velisek Karol, Slovak University of Technology in Bratislava
Cristian Barz, Technical University of Cluj Napoca
Erdei Zoltan, Technical University of Cluj Napoca
Ungreanu Nicolae, Technical University of Cluj Napoca
Erdei Zoltan , Technical University of Cluj Napoca
Nicolae Ungureanu, Technical University of Cluj Napoca
Bjoern Solvang, UiT - The Arctic University of Norway
Sziebig Gabor, UiT Arctic University of Norway
Nor Azni Shahari, Universiti Teknologi MARA Seremban Campus
Annie Yusni Hanan , Universiti Teknologi MARA Seremban Campus
H.A.Hasnan, Universiti Teknologi MARA Seremban Campus
Khairul A. Rasmani , Universiti Teknologi MARA Seremban Campus
N.A.H. Noor Ishak, Universiti Teknologi MARA Seremban Campus
Nur Amira Mat Saffie , Universiti Teknologi MARA Seremban Campus
10
Borojevic Stevo, University of Banja Luka
Gvero Petar, University of Banja Luka
Knezevic Darko, University of Banja Luka
Latinovic Tihomir, University of Banja Luka
Milasinovic Aleksandar, University of Banja Luka
Milovanovic Zdravko, University of Banja Luka
Petkovic Snezana, University of Banja Luka
Biljana Vojvodić, University of Banja Luka
Cica Djordje, University of Banja Luka
Čiča Đorđe, University of Banja Luka
Dobraš Dragoslav, University of Banja Luka
Globočki-Lakić Gordana, University of Banja Luka
Golubović-Bugarski Valentina, University of Banja Luka
Janjić Goran, University of Banja Luka
Knežević Bojan, University of Banja Luka
Knežević Darko, University of Banja Luka
Milovanovic Zdravko, University of Banja Luka
Rogic Miroslav, University of Banja Luka
Sredanović Branislav, University of Banja Luka
Tanasić Zorana, University of Banja Luka
Tica Milan, University of Banja Luka
Todic Mladen, University of Banja Luka
Vranješ Biljana, University of Banja Luka
Kotur Milovan, University of Banja Luka
Trisovic Natasa, University of Belgrade
Aleksandar Marinković, University of Belgrade
Lazovic Tatjana, University of Belgrade
Lecic Milan, University of Belgrade
Trišović Nataša, University of Belgrade
Zrnić Nenad, University of Belgrade
Damir Hodžić, University of Bihac
Edin Mujčić, University of Bihac
Edis Softić, University of Bihac
Esad Bajramović, University of Bihac
Fatka Kulenović, University of Bihac
Hodžić Atif, University of Bihac
Jasna Hamzabegović, University of Bihac
Karabegovic Isak, University of Bihac
Minka Ćehić, University of Bihac
Samir Vojić, University of Bihac
Sefik Behrem, University of Bihac
11
Ćirić Kostić Snežana, University of Kragujevac
Kosec Borut, University of Ljubljana
Fras Zemljic Lidija, University of Maribor
Zivkovic Predrag, University of Nis
Gordana Stefanovic, University of Nis
Milan Rackov, University of Novi Sad
Dezso Gergely, University of Nyíregyháza
Labudzki Remigiusz, University of Poznan
Gencho Popov, University of Ruse
Krasimir Tujarov, University of Ruse
Cohodar Maida, University of Sarajevo
Kruszelnicka Weronika, University of Science and Technology in Bydgoszcz
Barb Carmen Sorina, UNIVERSITY OF SIBIU "LUCIAN BLAGA"
Miroslavljevic Krunislav, University of Slavonski Brod
Goran Simunovic, University of Slavonski Brod
Ana Socalici, University Politehnica Timisoara
Benea Laura, University Politehnica Timisoara
Diana Alina Bistrian Topor, University Politehnica Timisoara
Iagar Angela, University Politehnica Timisoara
Imre Kiss, University Politehnica Timisoara
Marius Benea, University Politehnica Timisoara
Ovidiu Tirian, University Politehnica Timisoara
Rusu-Anghel Stela, University Politehnica Timisoara
Sorin Deaconu, University Politehnica Timisoara
Sorin Ratiu, University Politehnica Timisoara
Stoica Diana, University Politehnica Timisoara
Vasiu Teodor, University Politehnica Timisoara
Lemle Ludovic Dan, University Politehnica Timisoara
Cioata Vasile, University Politehnica Timisoara
Cuntan Corina, University Politehnica Timisoara
12
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CONTENTS
KEYNOTE LECTURES...................................................................................... 23
5G ˗ FIFTH GENERATION OF MOBILE PHONE NETWORK ........................................... 25
MIROSLAV PRŠA, KAROLINA KASAŠ˗LAŽETIĆ ............................................................ 25
THE CASE STUDY OF NEW APPROACH TO ROBOT PROGRAMMING AND LAYOUT
DESIGN BY SUPPORTING VIRTUAL AND AUGMENTED REALITY ................................. 26
X RADOVAN HOLUBEK1, Y MARTINA KUSÁ1, Z ROBERT BOČÁK1 .............................. 26
PYDIGITIZER A PYTHON MODULE FOR DIGITIZING 2D CURVES .............................. 27
DORIAN NEDELCU1, TIHOMIR LATINOVIC2, LJILJA SIKMAN3 ..................................... 27
NANOTECHNOLOGY ADVANCES IN NOVEL MATERIALS FOR ENERGY AND
ELECTRONICS APPLICATIONS .................................................................................... 28
ZLATAN AKSAMIJA, ASSOCIATE PROFESSOR OF MATERIALS SCIENCE AND
ENGINEERING ........................................................................................................... 28
FUNDAMENTAL SCIENCE ........................................................................... 32
MULTI CRITERIA DECISION MODELING: CRUCIAL ISSUE IN BACKCASTING SCENARI TC
"METALLOGRAPHIC ANALYSIS OF PRECIPITATION-HARDENED STATE RH950 STEEL 17-
7PH OF MODIFIED" \F C \L "1" O DEVELOPMENT ASSESSMENT................................ 33
METALLOGRAPHIC ANALYSIS OF PRECIPITATION-HARDENED STATE RH950 STEEL 17-
7PH OF MODIFIED .................................................................................................... 33
DJORDJE VOJINOVIC1, PETAR GVERO2 AND SRDJAN VASKOVIC3 ............................... 33
THE MATHEMATICS APPROACHES IN THE ANALYSIS OF MATHEMATICS SYLLABUSES
SIMILARITIES AMONG JAPANESE AND BOSNIA AND HERZEGOVINA UNIVERSITIES .. 34
MIRJANA MILIJEVIĆ1, DRAGANA PRERADOVIĆ KULOVAC2 ........................................ 34
TITLE: WATER PURIFYING FROM THE WELLS OF THE LOWER WATER AQUIFERS ....... 35
AUTHORS: TRIŠOVIĆ ZAGA ....................................................................................... 35
ELECTROCHEMICAL DISINFECTION OF WATER BY INSITU OBTAINING HYPOCHLORITE
FROM DILUTE CHLORIDE SOLUTIONS IN A FLOWING ELECTROCHEMICAL CELL WITH
SPIRAL ELECTRODES ................................................................................................. 36
AUTHORS: TRIŠOVIĆ TOMISLAV, TRIŠOVIĆ ZAGA ..................................................... 36
A NEW SOLUTION FOR SOLVING CERTAIN CLASS OF NEGATIVE PELL’S EQUATIONS
AND BINARY TREES. .................................................................................................. 37
JOVAN MIKIĆ ............................................................................................................ 37
DROP OUT ANALYSIS IN STEAM DISCIPLINES AT UNIVERSITY OF BANJA LUKA ......... 38
PRERADOVIC KULOVAC, D. ....................................................................................... 38
TOXICITY OF DRINKING WATER ASSESSMENT OF THEIR POTENTIAL RISK TO HUMAN
HEALTH ..................................................................................................................... 39
IR SUICA-BUNGHEZ1, RM SENIN1, R STOICA1, ID DULAMA2, IA BUCURICA2, AL BANICA2
................................................................................................................................. 39
NUMERICAL STUDIES ON AERODYNAMIC PERFORMANCE OF NACA 0018 PROFILE IN
FUNDAMENTAL AND RESEARCH APPLICATION OF THE AEROSPACE INDUSTRY ........ 40
14
ELIZA IOANA APOSTOL1, AUREL MIHAIL TITU2 .......................................................... 40
SPECIFIC ASPECTS OF QUALITY AND SAFETY MANAGEMENT IN AEROSPACE FIELD .. 41
ELIZA IOANA APOSTOL1, PETRICĂ TERTEREANU2, IULIANA MOISESCU3, AUREL MIHAIL
TITU4 ......................................................................................................................... 41
TREATMENT OF SALT WATER FORMED DURING DRILLING OPERATIONS BY
ELECTROCOAGULATION ............................................................................................ 42
MUHAMMED KAMIL ÖDEN ...................................................................................... 42
UNPOLARIZED RAMAN SPECTRA SHIFT IN SOLIDIFIED OIL-WATER-SALTWATER ....... 43
SH DHOBI1, B KOIRALA2, R WAIBA3, K PAUDEL4, K YADAV5, AK SHAH6, JJ NAKARMI7 43
MAGNETO-OPTICAL PROPERTIES OF WATER AND SALTWATER IN PRESENCE OF
MAGNETIC FIELD ...................................................................................................... 44
R WAIBA, SH DHOBI, B KOIRALA, K PAUDEL, K YADAV, AK SHAH, JJ NAKARMI ......... 44
GREEN’S FUNCTION IN QUANTUM STATISTICAL PHYSICS ......................................... 45
JOVAN P. ŠETRAJČIĆ1, STEVO K. JAĆIMOVSKI2, SINIŠA M. VUČENOVIĆ3 .................... 45
MICROSTATES OF ELEMENTARY EXCITATIONS IN SANDWICH NANO-STRUCTURES .. 46
JOVAN P. ŠETRAJČIĆ1, SINIŠA VUČENOVIĆ2 ............................................................... 46
MATERIALS ENGINEERING ........................................................................ 48
NEW METHODS OF WELDING THIN STEEL PLATES USING PULSED CURRENT............. 49
AUTHORS: L. ZGRIPCEA, M. ARDELEAN, V. PUTAN AND C. BIRTOK BĂNEASĂ ........... 49
SUSTA INABLE DEVELOPMENT INDICATORS IN THE STEEL INDUSTRY
.... 50
AUTHORS: I., FĂRCEAN, G., PROȘTEAN, AND A., SOCALICI ........................................ 50
ON THE MODIFICATION OF THE CAVITATION RESISTANCE OF THE ALUMINUM ALLOY
2017 A, THROUGH THE PARAMETERS OF THE HEAT TREATMENT OF AGING ............ 51
CL SALCIANU, C GHERA, I BORDEAȘU, B GHIBAN, M L MICU, I DIONISIE, O.P. ODAGIU
AND A LUCA7 ............................................................................................................ 51
INSIGHT INTO THE ELECTRO-OPTICAL BEHAVIOR OF CARBAZOLE-BASED DONOR-
ACCEPTOR OLIGOMERS ............................................................................................ 52
AUTHORS: M. SOROCEANU, C.-P. CONSTANTIN AND M.-D. DAMACEANU ............... 52
RADIOGRAPHIC FILM WASTE MANAGEMENT AND RECOVERY ................................. 53
ARDELEAN ERIKA1, ARDELEAN MARIUS2, GALFI CORINA3, SOCALICI ANA4, JOSAN
ANA5 ......................................................................................................................... 53
APPLICATION OF LASER SURFACE WELDING IN TOOL REPAIRING ............................. 54
DRAGOSLAV DOBRAŠ1, MILISAV MARKOVIĆ2, JOVAN MARIĆ3 .................................. 54
SURFACE WELDING TECHNOLOGY IN REPAIR OF CAST IRON CASTINGS G42CRMO4 . 55
MILISAV MARKOVIĆ1, DRAGOSLAV DOBRAŠ2, SLAVIŠA SAVIĆ3 ................................ 55
GEOMETRY AND COMPOSITION OF DUST PARTICLES IN DENTAL LABORATORIES .... 56
BORUT KOSEC1,2, ZORANA TANASIĆ3, MILANA ILIĆ MIĆUNOVIĆ4, VALENTINA
VESELINOVIĆ5, GORAN JANJIĆ3, ALEŠ NAGODE1 ........................................................ 56
HEAT TRANSFER PARAMETERS IN THE MELT-SPINNING PROCESS ............................ 57
BLAŽ KARPE1, BORUT KOSEC1,2, MIRKO GOJIĆ3, MILAN BIZJAK1 ................................ 57
THERMAL PROPERTIES OF METAL DENTAL MATERIALS ............................................ 58
15
BORUT KOSEC1,2, MATEJA VODLAN3,1, BLAŽ KARPE1, ALENKA PAVLIČ4, ALEŠ NAGODE1
................................................................................................................................. 58
BORUT KOSEC1,2, MATEJA VODLAN3,1, BLAŽ KARPE1, ALENKA PAVLIČ4, ALEŠ NAGODE1
................................................................................................................................. 58
MEASUREMENT OF THERMAL CONDUCTIVITY OF THE CORTICAL BONE:
EXPERIMENTAL STUDIES AND COMPARATIVE ANALYSIS .......................................... 59
PAWEŁ ZAWADZKI 1,*, ADAM PATALAS 1, REMIGIUSZ ŁABUDZKI 1, RAFAŁ TALAR 1 . 59
SCIENCE OF METALS THROUGH STORY OF TTT DIAGRAMS AND MICROSTRUCTURES
................................................................................................................................. 60
BELMA FAKIĆ1, ADISA BURIĆ1, EDIB HOROZ1 ............................................................ 60
METALLOGRAPHIC ANALYSIS OF PRECIPITATION HARDENED STATE RH950 STEEL 17-
7PH OF MODIFIED CHEMICAL COMPOSITION ........................................................... 61
BELMA FAKIĆ1, DIANA ĆUBELA1 ................................................................................ 61
CHEMICAL PROCESSES FOR THE SYNTHESIS OF PVDF-CNT-CO3O4 NANOCOMPOSITE 62
V. ȚUCURREANU1, G. CRĂCIUN1, C. ROMANIȚAN1, C. MIHĂILESCU1, A. MATEI1 ........ 62
ANALYSIS OF YELBEYI (BOZKIR TURKEY) MANGANESE MINERALIZATION WITH
GEOSTATISTICAL METHODS ...................................................................................... 63
ALICAN OZTURK1, BILGEHAN YABGU HORASAN*2 ABDÜLHEKIM DEMIR1 .................. 63
TECHNOLOGICAL DETAILS ABOUT THE DEOXIDATION OF STEELS ON AN EBT-LF-MTC
TECHNOLOGICAL FLOW ............................................................................................ 64
RADU1, HEPUT1, ERICA ARDELEAN1, MARIUS ARDELEAN1 ......................................... 64
STUDY OF DISC−SHAPED ZNO BASED VARISTORS DOPED WITH V2O5, SB2O3, CO3O4,
SNO2, AND CR2O3 ...................................................................................................... 65
M. V. LUNGU1, A. CARAMITU2, D. PĂTROI3, V. MARINESCU4, G. SBARCEA5, M.
LUCACI6, M. MARI7, D. TĂLPEANU8 AND P. GODEANU9 ............................................. 65
SPARK PLASMA PROCESSING OF ALCOCRFENI2 .1 HIGH ENTROPY ALLOY ................... 66
M. LUCACI1, M. V. LUNGU2, D. TĂLPEANU3, V. TSAKIRIS4, V. MARINESCU5, G.
SBARCEA6, M. MARIN7, D. CIRSTEA8 ......................................................................... 66
STUDY OF THE CAVITATION BEHAVIOR OF THE 7075 ALUMINUM ALLOY STRUCTURE
BY AGING TREATMENT ............................................................................................. 68
N. LUCA1, I BORDEASU2, L M MICU3, C GHERA4, B. GHIBAN5, A.M. DEMIAN6 AND A .D.
BUZATU7 ................................................................................................................... 68
AGEING MAINTAINING TIME INFLUENCE OF CAVITATION RESISTANCE OF 6082
ALUMINUM TYPE ALLOY ........................................................................................... 69
C GHERA1, I DIONISIE2, I BORDEAȘU3, B GHIBAN4, O P ODAGIU5, CL SALCIANU6, M L
MICU7, A LUCA8 ........................................................................................................ 69
RESEARCH ON THE IMPROVEMENT OF THE PHYSICAL AND MECHANICAL
CHARACTERISTICS OF STEELS FOR CONICAL GEARING THROUGH
NITROCARBURATION ................................................................................................ 70
G MIHUȚ1, M ARDELEAN2 ......................................................................................... 70
16
EXPERIMENTAL MODELING OF ABRASIVE WATER-JET CUTTING PROCESSES OF
KEVLAR FIBER-REINFORCED POLYMER COMPOSITES ................................................ 71
D. GUBENCU1, C. LAZĂR1 ........................................................................................... 71
CHANGES IN THE MECHANICAL AND DIELECTRICAL PROPERTIES OF SOME DIELECTRIC
ELASTOMERS ............................................................................................................ 72
A SOROCEANU .......................................................................................................... 72
ORGANIC-INORGANIC POLYMERIC SILOXANES FILLED WITH SCHIFF-BASE METAL
COMPLEXES .............................................................................................................. 73
A SOROCEANU .......................................................................................................... 73
LOW COST SYNTHESIS OF HYDROXYAPATITE USING A RENEWABLE MARINE SOURCE
OF CALCIUM ............................................................................................................. 74
RADU BANICA1, ALEXANDRA IOANA BUCUR2, RAUL ALIN BUCUR3, CRISTINA
MOSOARCA4, MIHAI-COSMIN PASCARIU5, ZOLTAN SZABADAI6 ................................ 74
PLANT MEDIATED GREEN SYNTHESIS OF SILVER NANOPARTICLES: TUSSILAGO
FARFARA VS. HELICHRYSUM ARENARIUM VS. ARTEMISIA ABSINTHIUM .................. 75
SORESCU ANA ALEXANDRA1, SUICA BUNGHEZ IOANA RALUCA2, SENIN RALUCA3,
STOICA RUSANDICA4, GANCIAROV MIHAELA5 .......................................................... 75
AN OVERVIEW OF METHODS AND TECHNOLOGIES FOR THE PRODUCTION OF
ALTERNATIVE DIESEL FUEL FROM USED ENGINE OIL ................................................. 76
RAȚIU SORIN AUREL1, ARMIONI DIANA MIRUNA2 .................................................... 76
COMPOSITIONAL AND MICROSCOPIC CHARACTERIZATIONS OF A SRI LANKAN BRICK
CLAY VARIETY TOWARDS SOME ADVANCED CHEMICAL CATALYTIC APPLICATIONS.. 77
SURESH ALUVIHARA1, C.S.KALPAGE2, P.W.S.K. BANDARANAYAKE3 .......................... 77
MECHANOCHEMICAL DESTABILIZATION OF MGH2-V NANOCOMPOSITES FOR
HYDROGEN STORAGE ............................................................................................... 78
Z. SEKULIĆ1, I. MILANOVIĆ2, B. BABIĆ2, M. PRVULOVIĆ2, J. GRBOVIĆ.NOVAKOVIĆ2, V.
ASANOVIĆ3 ............................................................................................................... 78
MECHANICAL ENGINEERING ..................................................................................... 82
COMPUTING THE VALUE OF UNEVEN RAISING OF BUILDING CONSISTING OF NINE
SEGMENTS DEFLECTED FROM VERTICAL DUE TO MINING EXPLOITATION ................ 83
KRZYSZTOF GROMYSZ1, JUSTYNA ORWAT2 ............................................................... 83
DESIGN AND OPTIMIZATION STUDY OF A RESISTANCE STRUCTURE FOR AN
INDUSTRIAL STORAGE PLATFORM SUPPORTING INJECTION MOLDING TOOLS FOR
THE AUTOMOTIVE INDUSTRY ................................................................................... 84
AUTHORS: D ALIC, C PINCA BRETOTEAN ................................................................... 84
INFLUENCE OF THE DRAG COEFFICIENT OF A SINGLE BUBBLE IN VERTICAL UPWARD
TURBULENT BUBBLY FLOWS ..................................................................................... 85
AUTHORS: M. RAKOVIĆ, D. RADENKOVIĆ, A. ĆOĆIĆ AND M. LEČIĆ ........................... 85
TECHNICAL DESIGN OF A PROTOTYPE OF A SPECIAL PURPOSE MILLING MACHINE ... 86
TECHNICAL DESIGN OF A PROTOTYPE OF A SPECIAL PURPOSE MILLING MACHINE ... 86
DESIGN CONTROL SYSTEM BASED ON OPTIMAL CRITERION ..................................... 87
17
ZORAN GRAHOVAC1, DRAGAN ERCEG2, BOJAN KNEZEVIC3, ...................................... 87
PLATFORM INDEPENDENT INDUSTRIAL CONTROL .................................................... 88
ZORAN GRAHOVAC1, BOJAN KNEZEVIC2, DRAGAN ERCEG3 ....................................... 88
CALCULATION OF OPTIMAL STRUCTURES MADE OF ARTICULATED BARS ................. 89
AUTHORS: 1ITU RAZVAN BOGDAN, 2APOSTU SUSANA ECATERINA AND 3MARC
BOGDAN IOAN .......................................................................................................... 89
SOLVING PRACTICAL ENGINEERING PROBLEMS OF STRUCTURAL STRENGTH-
APPLICATION OF DYNAMIC REANALYSIS METHOD AND MODEL TESTING ................ 90
AUTHORS: PETROVIĆ ANA, WEI LI, TRIŠOVIĆ NATAŠA, MOMČILOVIĆ NIKOLA .......... 90
DEPENDENCE OF THERMAL STRESS ON PERFORATION OF PREMIXED CYLINDRICAL
GAS BURNER............................................................................................................. 91
BILJANA PROCHASKA1, SRETEN LEKIC2, PETAR GVERO3 ............................................. 91
MULTI-CRITERIA DECISION MODELING OF THE OPTIMAL COMBINATION FOR ENERGY
SUPPLY SCENARIO: TEST MODEL FOR DANISH ENERGY SECTOR DATA...................... 92
MAJA MRKIĆ BOSANČIĆ, PETAR GVERO AND SRĐAN VASKOVIĆ .............................. 92
STEREO VISION BASED ROBOT WELDING .................................................................. 93
AUTHORS: D ERCEG, B Z KNEZEVIC AND Z GRAHOVAC ............................................. 93
CONTROL ALGORITHM OF THE UNSTABLE 3DOF SYSTEM ......................................... 94
AUTHORS: D ERCEG, Z GRAHOVAC AND B Z KNEZEVIC ............................................. 94
METHODOLOGIES FOR DETERMINING SUSTAINABLE TRANSPORT IN TOURISM ....... 95
SNEŽANA PETKOVIĆ 1, VALENTINA GOLUBOVIĆ BUGARSKI 2, GORDANA GLOBOČKI
LAKIĆ3 , ŽELJKO ĐURIĆ 4 ............................................................................................ 95
EXAMINATION OF DILATATION WITH COLD WATER TESTING IN STEEL AND
COMPOSITE SCBA BOTTLES ...................................................................................... 96
ALEKSANDAR MAJSTOROVIĆ 1, MLADEN TODIĆ 2, TIHOMIR LATINOVIĆ 3, VINKO
BABIĆ4 ...................................................................................................................... 96
INVESTIGATION OF DYNAMIC BEHAVIOUR OF ONE COMPLEX STEEL STRUCTURE .... 97
VALENTINA GOLUBOVIĆ-BUGARSKI1, BRANISLAV SREDANOVIĆ2, SNEZANA
PETKOVIĆ3, MLADEN TODIĆ4 .................................................................................... 97
TITLE: ELECTRIC CARS - DIRECTIONS OF DEVELOPMENT AND CRITICAL POINTS ........ 98
AUTHORS: A CRNKIC, I MIKULIC, A HODZIC AND M DOBRNJAC ................................ 98
STUDY CONCERNING CONNECTING SYSTEM BETWEEN LOCOMOTIVE BODY AND THE
BOGIE AT CFR 060-EA 5100KW LOCOMOTIVE ........................................................... 99
LUISA IZABEL DUNGAN1, MIRCEA ADRIAN DUNGAN2, ADRIAN CIOABLĂ3, UNA
MACETA4.................................................................................................................. 99
TRIBOLOGICAL ASPECTS OF NANO-PARTICLE FLUID BASED COOLING AND
LUBRICATION IN MILLING PROCESS ........................................................................ 100
B. SREDANOVIC1, G. GLOBOCKI-LAKIC1, P. DUGIC2, A. SINIK2, D. DOBRAS1 .......... 100
HARMFULNESS DURING TECHNICAL INSPECTION OF ROAD VEHICLES ................... 101
MLADEN TODIĆ1, SNEŽANA PETKOVIĆ2, BILJANA VRANJEŠ3.................................... 101
18
HEAT PUMP EXERGY EFFICIENCY COMPARISON WITH USE OF DIFFERENT WORKING
SUBSTANCES ........................................................................................................... 102
N KORUGA1, N DOBRNJAC2, M DOBRNJAC3, I ALIC4 ................................................ 102
TECHNICAL AND ENVIRONMENTAL CHARACTERISTICS OF UTILIZING THE POTENTIAL
OF THE “GORNJA DRINA” HYDROPOWER SYSTEM IN REPUBLIC OF SRPSK ............. 103
O KASIKOVIC1, N DOBRNJAC2, D GOLUBOVIC3, M DOBRNJAC4, D KALABIC5 ............ 103
X-RAY ANALYSIS OF WELDING PARAMETERS INFLUENCE ON PRESSURE VESSEL
STEEL P355 N ........................................................................................................ 104
CIOROAGĂ BOGDAN-DOREL1, CIOATĂ VASILE GEORGE2 ......................................... 104
DEFORMATION STATE OF THE LOAD-BEARING STRUCTURE OF A FOUR-COLUMN
PRESS ..................................................................................................................... 105
MLADEN TODIC1, VALENTINA GOLUBOV-BUGARSKI1, MIRSAD MERDANIĆ2,
TIHOMIR LATINOVIĆ1 .............................................................................................. 105
BROWN FIELD DIGITALIZATION AND DIGITAL TWIN ............................................... 106
MILOVAN LAZAREVIĆ1, ACO ANTIĆ1, GORDANA OSTOJ1, MITAR JOCANOVIĆ1,
MIJODRAG MILOŠEVIĆ1 .......................................................................................... 106
MATHEMATICAL MODELS FOR PV MODULE TEMPERATURE USING WEATHER DATA
............................................................................................................................... 107
DANIJELA KARDAŠ ANČIĆ1, MIRKO KOMATINA2 ..................................................... 107
ENERGY EFFICIENCY OF THE PROCESS PLANNING DESIGN IN THE SCOPE OF INDUSTRY
4.0 .......................................................................................................................... 108
STEVO BOROJEVIĆ1, BRANISLAV SREDANOVIĆ2, MIJODRAG MILOŠEVIĆ3, MILENKO
SEKULIĆ4, SERGEJ JANKOVIĆ5 .................................................................................. 108
PRESSURE AND FLOW CONTROL LOOP FOR SERIAL AND PARALLEL HYDRAULIC
SYSTEMS POWERED BY THE FREQUENCY CONVERTERS .......................................... 109
Z KLINCOV1, B Z KNEZEVIC2, D ERCEG2 AND Z GRAHOVAC2 ..................................... 109
ANALYSIS OF CONTROL MODES IMPLEMENTED IN FREQUENCY CONVERTERS FROM
THE ASPECT OF INCREASING ENERGY EFFICIENCY ................................................... 110
Z KLINCOV1, B Z KNEZEVIC2, Z GRAHOVAC2 AND D ERCEG2 ..................................... 110
TOPOLOGICAL OPTIMIZATION OF VICE JAWS MODEL FOR PIPE CLAMPING............ 111
M MUMOVIĆ1, N ŠIBALIĆ1, A VUJOVIĆ1 AND J JOVANOVIĆ1.................................... 111
INFLUENCE OF AGING HEAT TREATMENT DURATION AT 1800C UPON CAVITATION
EROSION OF LAMINATED 5083 ALUMINUM ALLOY ................................................ 112
I BORDEASU 1, 2*, C GHERA2, L M MICU3*, C L SALCIANU4, I DIONISIE5, B GHIBAN6, A
LUCA7 AND D GUBENCU8 ........................................................................................ 112
STUDY AND ANALYSIS OF SANDWICH PANELS FOR USE IN THE CONSTRUCTION OF
CABIN ROOFS USED ON CONSTRUCTION EQUIPMENT ............................................ 113
R M BLEOTU1, C PREDA1 .......................................................................................... 113
MULTI-PURPOSE STAND IN THE FIELD OF HYDROSTATIC DRIVES ............................ 114
RADU RĂDOI1, MARIAN BLEJAN1, LILIANA DUMITRESCU1, DORIN BORDEAȘU2,
CRISTIAN GHERA2 ................................................................................................... 114
19
THE INFLUENCE OF THERMAL STRESSES ON THE PHENOMENON OF THERMAL
FATIGUE OF ROLLING CYLINDERS ........................................................................... 115
PINCA-BRETOTEAN CAMELIA1, JOSAN ANA2, ARUN KUMAR SHARMA3 .................. 115
JOVICA ILIĆ1, MLADOMIR MILUTINOV2, MILIJA KRAIŠNIK3 , DEJAN MOVRIN4 ...... 116
FABRICATION OF DEEP DRAWING TOOL COMPONENTS USING AN INDIRECT RAPID
TOOLING PROCEDURE ............................................................................................ 117
JOVICA ILIĆ1, MLADOMIR MILUTINOV2, MILIJA KRAIŠNIK3 , DEJAN MOVRIN4 ...... 117
INCREASING THE FATIGUE STRENGTH OF THREADED JOINTS OF OIL AND GAS
EQUIPMENT BY PLASTIC DEFORMATION OF THE THREAD UNDER HIGH LOAD BEFORE
MAKE-UP ................................................................................................................ 118
V B KOPEI1, O R ONYSKO2, V G PANCHUK3, Z M ODOSII4, T V LUKAN5 ..................... 118
INFLUENCE OF SIDE RAKE ANGLE OF A LATHE CUTTER ON THE THREAD PITCH
DIAMETER ACCURACY. THEORETICAL INVESTIGATION ........................................... 119
OLEH ONYSKO1, VOLODYMYR KOPEI2, CRISTIAN BARZ,3 VESNA RODIC4 ................. 119
SINGLE BUBBLE IN VERTICAL UPWARD TURBULENT BUBBLY FLOWS ...................... 120
M. RAKOVIĆ1, D. RADENKOVIĆ1, A. ĆOĆIĆ1, M. LEČIĆ1 ............................................ 120
MODELING OF INFLUENTIAL BENDING PARAMETERS OF NATURAL FIBER-BONDED
HARDBOARD .......................................................................................................... 121
A HODŽIĆ1, D HODŽIĆ1, D RAMIĆ1, H TALIĆ1 ............................................................ 121
TENSILE STRENGTH OF HARDBOARD WITH WOOD AND NATURAL WOOL FIBRES .. 122
A HODŽIĆ1, D HODŽIĆ1, D RAMIĆ1, H TALIĆ1 ............................................................ 122
MEASUREMENT OF STRAIN AND DETERMINATION OF STRESS STATE USING A MULTI-
CHAMBER VERTICAL CYLINDRICAL TANK MODEL .................................................... 123
ISLAMOVIĆ FADIL1, BAJRAMOVIĆ ERMIN1, BAJRAMOVIĆ ESAD1, BAJRAMOVIĆ EMIR1
............................................................................................................................... 123
MANAGEMENT OF THE PROCESS OF MOULDING-CASTING A STEEL PART IN ORDER
TO OPTIMIZE IT ....................................................................................................... 124
A JOSAN1, E ARDELEAN2, M ARDELEAN3 ................................................................. 124
DETERMINING THE POSSIBILITIES OF OPTIMAL CONTROL OF THE PRODUCT ROUTING
CONTROL SYSTEM AT THE GRAIN ELEVATOR .......................................................... 125
S TYMCHUK1, V MARDZIAVKO1, M SYROTENKO1, A PISKAREV1, O MIROSHNYK1, T
SHCHUR2, W KRUSZELNICKA3, A TOMPOROWSKI3, R. KASNER3 .............................. 125
THE DEPENDANCE OF BREAKAGE ENERGY ON THE GRAIN SIZE FOR SELECTED
BIOMATERIALS ....................................................................................................... 126
DEVELOPMENT OF THE STRUCTURE AND METHODOLOGICAL SUPPORT OF THE
SYSTEM FOR ANALYSIS OF THE DETAILS SHAPING USING THE TECHNOLOGICAL
INHERITABILITY OF THEIR QUALITY PARAMETERS .................................................. 127
YAROSLAV KUSYI1, OLEH ONYSKO2, ANDRII KUK3, OLHA KOSTIUK3, BOHDAN
SOLOHUB3 .............................................................................................................. 127
ANALYSIS OF THE POSSIBILITY OF THE DEVELOPMENT OF THE LIFE CYCLE OF FOOD
PACKAGING CONSTRUCTION .................................................................................. 128
20
PATRYCJA BAŁDOWSKA-WITOS .............................................................................. 128
ANALYSIS OF THE QUALITY MANAGEMENT OF THE FOOD PACKAGING LIFE CYCLE. 129
PATRYCJA BAŁDOWSKA-WITOS .............................................................................. 129
DYNAMIC STUDY THROUGH NUMERICAL SIMULATIONS OF MACPHERSON TYPE
SUSPENSION AND STATIC ANALYSIS OF SHOCK ABSORBER COMPONENTS ............ 130
C PREDA1, R M BLEOTU2, C PINCA-BRETOTEAN3 ...................................................... 130
RESEARCH REGARDING THE INFLUENCE OF WATER INJECTION UPON
THE COMBUSTION PROCESS IN A COMPRESSION IGNITION ENGINE 131
AUTHORS: C C SUCIU1[0000-0002-8754-534X], S V IGREȚ 2[0000-0001-5649-0617], I IONEL1[0 000-0002-2999-
1210] ......................................................................................................................... 131
PROGRAMMABLE LOGICAL CONTROLLER (PLC) IN MANUFACTURING EXECUTION
SYSTEM (MES) SYSTEM ........................................................................................... 132
MILOŠ BOŽIĆ1, BOGDAN SAVKOVIĆ1, SREĆKO ĆURČIĆ2 ........................................... 132
ELECTRICAL ENGINEERING...................................................................... 135
ADVANCED MODELLING AND CONTROL FOR MANAGING A FLUCTUATING AND
INTERMITTENT POWER SOURCE IN OPERATING A MULTI PUMPING SYSTEM WITH
WATER STORAGE .................................................................................................... 138
AUTHORS: D BORDEAȘU AND O PROȘTEAN .......................................................... 138
ANALYSIS OF THE PERFORMANCE OF PHOTOVOLTAIC SYSTEMS IN THE NORTH-WEST
REGION ................................................................................................................... 139
ZOLTAN ERDEI1, CRISTIAN BARZ1, ALEXANDRU GRIB2, TAMASAN CRISTINA2 .......... 139
USING 3D BUILDER IN DESIGNING A 3D PUZZLE ..................................................... 140
CRISTIAN BARZ1, ZOLTAN ERDEI1, ŽIVKOVIĆ PREDRAG2, OLEH ONYSKO3, MIHALI
MARIA1 ................................................................................................................... 140
REDUCTION OF AC MAGNETIC FIELD APPLYING DIFFERENT SCREENS ..................... 141
KAROLINA KASAŠ-LAŽETIĆ1, TEODORA GAVRILOV1, GORANA MIJATOVIĆ1, MIROSLAV
PRŠA2 ...................................................................................................................... 141
SOME ASPECTS REGARDING THE CONTRIBUTION OF HYDROELECTRIC PLANTS TO THE
ELECTRICITY PRICE AT FINAL CONSUMERS IN ROMANIA ........................................ 142
NEGREA DANIELA1, SZABO EMERIC REMUS2, LOLEA SAVU3, GALE SORIN4 .............. 142
SEVERAL ISSUES ABOUT ASSESSMENT OF THE HYDROELECTRIC AGGREGATES
AVALILABILITY ........................................................................................................ 143
NEGREA DANIELA1, SZABO EMERIC REMUS2, LOLEA SAVU3, GALE SORIN4 .............. 143
SEVERAL ISSUES ABOUT ASSESSMENT OF THE HYDROELECTRIC AGGREGATES
AVALILABILITY ........................................................................................................ 143
ROMANIA IN THE ENERGY TRANSITION, FOR SMALL PROSUMERS - POST PANDEMIC
AND THE UKRAINE WAR ......................................................................................... 144
MIHAI ALEXANDRU BLAJ1, SORIN IOAN DEACONU2, ............................................... 144
COMPUTER AIDED DESIGN OF LOW VOLTAGE ELECTRICAL INSTALLATIONS ........... 145
M.F PREDUS1, C.M MUSCAI1,2, C POPESCU3, C HATIEGAN1 ...................................... 145
XILINX CONTROL CIRCUIT MADE TO HIGHLIGHT INJECTED FUEL FLOW ................... 146
21
BACIU I.1, CUNTAN C.D.1, POPA G.N.1, IAGAR A.1 .................................................... 146
A FEW CONNECTIONS BEETWEEN ELECTRICITY PRICES AND HYDROGEN PRODUCTION
............................................................................................................................... 147
AUTHORS: 1LOLEA MARIUS AND 2DZITAC SIMONA ................................................. 147
FUZZY LOGIC APPLYING FOR ASSESSMENT ELECTRICITY AVAILABILITY IN
CONVERSION SYSTEMS WITH RENEWABLE ENERGY SOURCES(RES) ....................... 148
AUTHORS: 1LOLEA MARIUS AND 2DZITAC SIMONA ................................................. 148
COMPUTER ENGINEERING...................................................................... 151
TITLE: CONDUCTING REUSABLE BIG DATA ANALYSES ON AIR POLLUTION AND PUBLIC
HEALTH ................................................................................................................... 152
AUTHORS: A TRISOVIC ............................................................................................ 152
THE IMPORTANCE OF ACCOUNTING INFORMATION IN THE DECISION-MAKING
PROCESS ................................................................................................................. 153
TIREAN GELU OVIDIU1, TUȘA ANA1 ......................................................................... 153
THE IMPACT OF CLOUD MANUFACTURING ON IOT E. M. CIORTEA ......................... 154
E. M. CIORTEA: ....................................................................................................... 154
KEY ELEMENTS IN THE INTEGRATION OF URBAN INFRASTRUCTURE WITH
INTELLIGENT TRANSPORTATION SYSTEMS IN SMART CITIES................................... 155
MĂDĂLIN-DORIN POP ............................................................................................ 155
A MODEL OF A SUSTAINABLE INFORMATION SECURITY MANAGEMENT SYSTEM IN
HIGHER EDUCATION INSTITUTIONS ........................................................................ 156
LJILJA SIKMAN1, TIHOMIR LATINOVIC2, NERMIN SARAJLIC3, GORAN SIKANJIC4, ADINA
POP-VADEAN5......................................................................................................... 156
A COMPARISON BETWEEN SMART CITY INITIATIVES FROM ROMANIA AND BOSNIA
AND HERZEGOVINA IN IMPROVING ROAD TRAFFIC MANAGEMENT ....................... 157
M D POP1, T LATINOVIC2 ......................................................................................... 157
AGILE SOFTWARE DEVELOPMENT: MODEL, METHODS, ADVANTAGES AND
DISADVANTAGES .................................................................................................... 158
A DŽANIĆ1, A TOROMAN2, A DŽANIĆ3 ..................................................................... 158
ANALYSIS OF THE PROBLEMS OF ACQUISITION OF DIGITAL PHOTOGRAPHS INTENDED
TO DETERMINE THE REQUIRED DIMENSIONAL ACCURACY OF THE PRODUCT ......... 159
D. TURINSKI1, I. SVALINA2, T. ŠAR3, R. LUJIĆ4, S. HAVRLIŠAN5............................... 159
MANAGEMENT OF EXPERIMENTAL DATA RESULTING FROM THE INVESTIGATION OF
APPLICATIONS IMPLEMENTED THROUGH SAP UI TECHNOLOGIES .......................... 160
A.D.BERDIE1, R.S.ROB1, C.L.RAT1, A.A.BERDIE2, A.PAUN3 ........................................ 160
OPTIMIZING THE OPERATION OF PHOTOVOLTAIC PANELS USING MATHEMATICAL
REGRESSION MODELS ............................................................................................. 161
C L RAT1, C I ICHIM-BURLACU2, D A BISTRIAN3 ........................................................ 161
A BRIEF SURVEY OF DIGITAL TWIN APPLICATIONS IN HUMAN-ROBOT
COLLABORATION .................................................................................................... 162
X RUŽAROVSKÝ1, Y MATÚŠOVÁ1, Z SKÝPALA1 ......................................................... 162
22
DIGITAL TOOLS FOR PRODUCTION PLANNING AS PART OF DECISION-MAKING
PROCESSES IN MANUFACTURING SYSTEMS ............................................................ 163
X MATÚŠOVÁ1, Y RUŽAROVSKÝ1, Q DELGADO SOBRINO1, Z HRUŠKOVÁ1 ............... 163
23
KEYNOTE LECTURES
24
25
5G ˗ FIFTH GENERATION OF MOBILE PHONE NETWORK
MIROSLAV PRŠA1, KAROLINA KASAŠ˗LAŽETIĆ1
1Faculty of Engineering, University of Novi Sad, Novi Sad, Serbia
E-mail: prsa@uns.ac.rs, kkasas@uns.ac.rs
Abstract
This presentation offers several approaches to the 5G mobile communications
network's understanding. It is adapted to a wide range of listeners, mostly engineers.
For this reason, it starts with short explanations of several terms and two expressions,
necessary to follow the story. After that, a principle of mobile communication is
presented, together with its short history and the reasons why the fifth generation was
necessary to be introduced. The main role of 5G is in affordable autonomous mobility
and remote operations of any kind.
The expectation of the 5G network and the 5G networks standards were listed in an
appropriate table, followed by principles of the new mobile phone generation. The
differences between 5G and previous generations were emphasized in detail, together
with the new components embedded in 5G.The next contribution to the text is the
description of electromagnetic fields present in our environment, together with
international standards, which suggest the maximal allowed values of electric and
magnetic field quantities. The Serbian choice of suggested values is presented as well.
Several misconceptions, that occurred in certain social networks, were presented
and discussed amusingly, showing how absurd the explanations could be.
Some reflections about the role of the mobile phone itself is also discussed and
followed by my own opinion about the 5g mobile phone appearance and future.
In this talk, first, an introduction to fractional calculus and the hybrid functions are
given. Then, an efficient numerical method based on hybrid functions for solving the
FDEs is presented. The numerical solutions are compared with available exact or
approximate solutions to assess the accuracy of the proposed method.
In this talk, first, an introduction to fractional calculus and the hybrid functions are
given. Then, an efficient numerical method based on hybrid functions for solving the
FDEs is presented. The numerical solutions are compared with available exact or
approximate solutions to assess the accuracy of the proposed method.
Finally, the main conclusion of this talk is that the 5G network is expected to be less
dangerous than the previous mobile phone network generations at least at the
frequencies up to some tenth of GHz; at the higher frequencies, some unknown new
effects could appear.
Keywords: mobile phone networks, 5G, standards, misconceptions in social
networks, application safety
26
THE CASE STUDY OF NEW APPROACH TO ROBOT
PROGRAMMING AND LAYOUT DESIGN BY SUPPORTING
VIRTUAL AND AUGMENTED REALITY
RADOVAN HOLUBEK1, MARTINA KUSÁ2, Z ROBERT BOČÁK3
1 Radovan Holubek: Slovak University of Technology in Bratislava, Faculty of Materials Sciences and
Technology in Trnava, Trnava, Slovakia, radovan.holubek@stuba.sk
2 Martina Kusá: Slovak University of Technology in Bratislava, Faculty of Materials Sciences and Technology in
Trnava, Trnava, Slovakia, martina.kusa@stuba.sk
3 Robert Bočák: Slovak University of Technology in Bratislava, Faculty of Materials Sciences and Technology in
Trnava, Trnava, Slovakia, robert.bocak@stuba.sk
Abstract
In currently designed robotic systems, great emphasis is focused on the optimal
choice of the appropriate position (smart place) of a particular type of industrial robot.
Depending on the chosen application, whether it is a handling, technological or
assembly operation, it is very important to choose a suitable type of robot and end
effector. Many problems in actually deployed production systems arise from the
inappropriately chosen kinematic structure of an industrial robot, where either the
robot cannot achieve the required production cycle, its size or load capacity is incorrectly
selected for a given type of the operation, or in some cases, the robot does not achieve
all required robot targets of the future robotic workplace. In the currently available
methods of designing future robotic systems, the pre-production phase of designing and
creating various robotic simulation scenarios has a very important role to verify the
robot's reachability to the required positions, as well as eliminating possible collisions
states with different peripherals, etc. This article aims to point out the new possibilities
of deploying modern technologies in the form of the use of virtual and augmented
reality in the chosen case study. The authors aim to show and verify in the VR and AR
environment the suitability of the selected type of industrial robot for the selected
operation, to simulate and validate the proposed robotic trajectories as well as the final
robotic Pick and Place operation for the selected case study.
27
PYDIGITIZER A PYTHON MODULE FOR DIGITIZING 2D
CURVES
DORIAN NEDELCU1, TIHOMIR LATINOVIC2, LJILJA SIKMAN3
1“Babes-Bolyai” University of Cluj-Napoca, Romania, Faculty of Engineering, Resita,
dorian.nedelcu@ubbcluj.ro
2University of Banja Luka, Faculty of Mechanical Engineering, Bosnia and Herzegovina, Banja Luka,
tihomir.latinovic@mf.unibl.org
3University of Banja Luka, Faculty of Technology, Bosnia and Herzegovina, Banja Luka,
ljilja.sikman@tf.unibl.org
Abstract
The digitizing process consists of extracting a curve numerical coordinates from an
explicit image. The paper describes the PyDigitizer module for digitizing 2D curves from
images, created with the help of free and Open Source resources, using Python as a
programming language, wx.Python as a graphical user interface toolkit and its
associated modules Matplotlib, NumPy, SciPy, SQLite, pywin32, pandas.
Digitizing is done manually, only for XY graphs type, by placing mouse points with
left-clicking over the curves in the image. After digitization, spline interpolation curves
can be plotted over the image curves, their intersection points can be accurately
calculated for specified X or Y values and the coordinates of the digitized points can be
displayed in tabular form; moreover, regression digitized curves can be generated, the
results can be exported to an Excel file or saved in a dataset to be restored later. It is
also possible to open Excel files, with point coordinates of one or more curves, to
operate intersections for the X or Y-axis.
The installation kit is available as a dataset at Mendeley by entering 'PyDigitzer' in
the 'Find research data' field. [Nedelcu, Dorian; Latinovic, Tihomir (2022), “PyDigitizer
A Python module for digitizing 2D curves”, Mendeley Data, V1, DOI:
10.17632/jnwyr7jzrd.1, https://data.mendeley.com/] for free install and use of it.
PyDigitizer is released under CC0 1.0 license: “You can copy, modify, distribute and
perform the work, even for commercial purposes, all without asking permission”. The
operating procedure is detailed in a video on the YouTube channel:
https://youtu.be/WifxfTgQKcY. The application was generated and tested with Python
2.7 version installed through "Python(x,y)" package (https://python-xy.github.io/ ) on
WINDOWS 10 operating system.
28
NANOTECHNOLOGY ADVANCES IN NOVEL MATERIALS FOR
ENERGY AND ELECTRONICS APPLICATIONS
ZLATAN AKSAMIJA, ASSOCIATE PROFESSOR OF MATERIALS SCIENCE AND ENGINEERING
University of Utah, e-mail: zlatan.aksamija@utah.edu
Thermal dissipation in increasingly scaled MOS devices has prompted strong interest
in both phonon emission and subsequent thermal transport in semiconductor
nanostructures. New multi-gate device designs further exacerbate thermal issues by
further localizing heat dissipation. Simultaneously, dwindling energy resources have
created renewed interests in thermoelectric (TE), or solid-state, energy conversion and
refrigeration using semiconductor-based nanostructures, such as nanowires,
nanoribbons, and superlattices. TE conversion is also an attractive approach for targeted
cooling of local hotspots inside integrated circuits due to inherently no moving parts,
ease of miniaturization and on-chip integration, and the nanostructures’ enhanced TE
conversion efficiency. In addition, thermoelectric power generation enables the reuse
of waste heat in a variety of applications, from low-power and energy-efficient designs
all the way up to internal combustion engines and solar cells. Beyond mere dissipation,
nanoscale thermal effects can be used in a broad range of applications such as thermal
rectification, sensing, and detection. In this talk, I will present techniques for numerical
simulation and modeling of phonon transport in a broad range of nanostructures,
focusing primarily on modeling extrinsic and disorder effects such as grain/sample
boundaries, interfaces, edges, and alloy mass disorder. The talk revolves around
numerically solving the phonon Boltzmann transport equation (pBTE), while the salient
feature of the work is that it employs a full phonon dispersion combined with a
momentum-dependent model of phonon boundary scattering. Our results show that
phonon transport in Si-Ge alloy nanowires exhibits super-diffusive behavior
characteristic of Levy-flight dynamics.
Two-dimensional (2D) materials have tremendous potential for next-generation
nano- and optoelectronics. However, heat dissipation and its removal from hot spots in
the monolayer remains a critical concern to the design of 2D-based devices. Thermal
currents flowing in an atomic layer can either dissipate through source/drain contacts
in a transistor configuration, or through a supporting substrate via van der Waals (vdW)
coupling to it. When a 2D material is supported by a substrate, the interfacial area
formed between it and the substrate is often far larger than the lateral source/drain
contact area. Thus, the majority of waste heat is removed across the 2D-substrate
interface and then via the substrate. The thermal boundary conductance (TBC) between
the 2D layer and substrate should be well characterized for reliable 2D device
performance. Interfaces formed between 2D vdW materials and 3D substrates are
fundamentally different than same-dimension 3D-3D and 2D-2D interfaces due to the
29
presence of a vdW gap and the different dimensionalities of the phase spaces on either
side of the interface. In this talk, I will review the progress in understanding lattice
thermal transport, both in-plane and cross-plane, in 2D mono and few-layer materials.
Next, I will introduce my recent work aimed to tackle the question of selecting the best
substrate for each 2D material from the point of view of heat dissipation. Then my talk
will review some recent work in length scaling of thermal conductivity in long graphene
ribbons, caused by collective phonon hydrodynamics, as well as thermal transport
between 2D materials and 3D substrates on which they are typically supported.
30
31
FUNDAMENTAL SCIENCES
32
33
MULTI CRITERIA DECISION MODELING: CRUCIAL ISSUE IN
BACKCASTING SCENARIO DEVELOPMENT ASSESSMENT
DJORDJE VOJINOVIC1, PETAR GVERO2 AND SRDJAN VASKOVIC3
1University of Banjaluka, Faculty of Technology, Banjaluka , B&H, djordje.vojinovic@tf.unibl.org
2 University of Banjaluka , Faculty of Mechanical Engineering, Banjaluka , B&H, petar.gvero@mf.unibl.org
3University of East Sarajevo, Faculty of Mechanical Engineering, East Sarajevo , B&H,
srdjan_vaskovic@yahoo.com
Abstract
In Bosnia and Herzegovina, sustainable development and climate change is
increasingly considered as a matter of key strategic importance, especially by local
authorities and the academic community. The State development vision is that by 2030
Bosnia and Herzegovina (B&H) will be a sustainable and progressive 'green economy'.
Backcasting approach, having in mind its descriptive character and the problem solving
at the very beginning, is much more convenient for solving long-term problems and
offering long-term sustainable solutions. Therefore, it is better to consider backcasting
as an approach rather than a method. Furthermore, backcasting studies should provide
decision-makers and the public in an entirely acceptable and interesting picture of the
future of the whole society on which an opinion should be formed for quality decision
making. Therefore, the scenarios of the development using the backcasting approach
should provide a wide description of the solutions that should be considered for the
adoption of final options of different future. It has been confirmed that the backcasting
approach is particularly promising in cases of complex problems, the need for radical
changes, in cases where dominant trends are part of the problem and external
influences that cannot be sufficiently addressed in the current market. The aim of this
article is the identification of the optimal scenario in the selected sectors using the
backcasting approach, and their analysis through the Multi-Criteria Decision Modeling
(MCDM),by application of DEXi software, to evaluate their acceptability and the
possibilities of their use in B&H.
Keywords: backcasting, scenario development, MCDM, DEXi
34
THE MATHEMATICS APPROACHES IN THE ANALYSIS OF
MATHEMATICS SYLLABUSES SIMILARITIES AMONG JAPANESE
AND BOSNIA AND HERZEGOVINA UNIVERSITIES
MIRJANA MILIJEVIĆ1, DRAGANA PRERADOVIĆ KULOVAC2
1University of Banja Luka, Faculty of Economics, Bosnia and Herzegovina, mirjana.milijevic@ef.unibl.orgt
2University of Corvinus, Doctoral School of Business, Management and Informatics, Budapest, Hungary.
University of Banja Luka, Faculty of Economics, Banja Luka, Bosnia and Herzegovina,
dragana.preradovic@ef.unibl.org
Abstract
We analyze and compare curricula of pure mathematics courses that are taught to
students of economics in Japan and in Bosnia and Herzegovina. It was noticed that
students in Bosnia and Herzegovina do not understand very strong relation between
mathematics and economics, especially when it comes to application of mathematics to
real life problems in economics.
Data set contains math syllabuses in school year 2021/22 from six public universities
in Bosnia and Herzegovina and 7 from Japan. Data preparation and modeling are
implemented in Python. We used TF-IDF (Term Frequency Inverse Document
Frequency) algorithm to find similarity among Japanese and Bosnia and Herzegovina
math syllabuses.
The goal of our research is improvement of mathematics curriculum and
popularization of mathematics among students of economics in developing countries.
Keywords: TF-IDF algorithm, similarity analysis, text mining, mathematics, linear
regression
35
WATER PURIFYING FROM THE WELLS OF THE LOWER WATER
AQUIFERS
AUTHORS: TRIŠOVIĆ ZAGA
Abstract: Purification of drinking water plays an important role in maintaining public
health because water is the most essential element of life and the main agent for basic
hygiene. Given the importance, the parameters of the chemical and bacteriological
quality of water are defined by the regulation from 1998 which identifies the maximum
allowable concentrations of chemical substances and bacteria in drinking water.
Bacteriological quality of water is relatively easily achieved by dosing an oxidant, usually
chlorine, in the water, while in the case of high concentration of the chemical substances
in the water physic-chemical methods are necessary to remove them. The most
common is the increased concentration of dissolved gases, calcium, magnesium, and
iron in the wells that do not draw water from the first water aquifers. This paper, based
on the chemical and bacteriological analysis and consumption of the drinking water, is
presented the technical solution of the lower raw water aquifer with increased
concentration of dissolved gases, magnesium, and iron, purified to obtain drinking water
quality defined by national regulations.
36
ELECTROCHEMICAL DISINFECTION OF WATER BY INSITU
OBTAINING HYPOCHLORITE FROM DILUTE CHLORIDE
SOLUTIONS IN A FLOWING ELECTROCHEMICAL CELL WITH
SPIRAL ELECTRODES
AUTHORS: TRIŠOVIĆ TOMISLAV1, TRIŠOVIĆ ZAGA2
Affiliation of authors
1Trišović Tomislav: Institute of Technical Sciences of the Serbian Academy of Sciences and Arts,
Belgrade, Serbia, e-mail: trisa@tmf.bg.ac.rs
2Trišović Zaga: University of Belgrade, Belgrade, Serbia, e-mail: zaga.trisovic@gmail.com
Abstract
Disinfection is the basic and obligatory treatment of drinking water. Several
compounds are used as disinfectants: chlorine gas, sodium hypochlorite, chlorine
dioxide, dichlorocyanourate, hydrogen peroxide, potassium permanganate and others.
The latest devices currently in use in the world are devices that produce disinfectants in
situ at the point of need. The most famous devices are sodium hypochlorite generators
that convert kitchen salt into active chlorine (hypochlorite) in an electrochemical cell.
Electrochemical reactions take place on the surface of the catalyst since the compounds
that oxidize or reduce, take (anodic reaction) or give (cathodic reaction) electrons from
the surface of the catalyst. The most common limitations in reaction rate are ion
transport to the catalyst surface. To increase the reaction rate, the solution is mixed with
a stirrer or recirculated with pumps. Another even more important factor is the
maximum current density, ie the limit current density, which represents the maximum
current strength per unit area of the catalyst and is most often expressed in (mA / cm2).
The synthesis of chlorine gas takes place at current densities of the order of 1 A / cm2,
while the electrochemical synthesis of hypochlorite from dilute chloride solutions with
over fifty times lower current density from 5 to 80 mA / cm2. The only way to obtain the
desired product production is to increase the catalyst surface area. In this paper, new
construction of electrochemical cells with increased catalyst surface area is proposed.
The cells are much smaller in size with spirally bent electrodes as catalyst supports,
where the circulation of electrolytes through the interelectrode space is achieved by a
dosing pump, and pulsation of the electrolyte.
37
A NEW SOLUTION FOR SOLVING CERTAIN CLASS OF NEGATIVE
PELL’S EQUATIONS AND BINARY TREES.
JOVAN MIKIĆ
University of Banja Luka, Faculty of Technology, Banja Luka, Bosnia and Herzegovina,
jovan.mikic@tf.unibl.org
Abstract
We present two new solutions for a well-known negative Pell’s equation
=−. Both solutions are based on the method of infinite descent. By using
elementary number theory, it is shown that all solutions belong to a binary tree. We
show that the same idea can be used for solving negative Pell’s equations of the form
− =−, where is an odd prime number such that =+.
Keywords: Negative Pell’s equation, method of infinite descent, binary tree, number
theory.
38
DROP OUT ANALYSIS IN STEAM DISCIPLINES AT UNIVERSITY
OF BANJA LUKA
PRERADOVIC KULOVAC, D.
Corvius University of Budapest, Doctoral school of Business, Management and Informatics, Hungary;
University of Banja Luka, Faculty of Economics, Bosnia and Herzegovina, dragana.preradovic@ef.unibl.org
Abstract
Drop out is the number or rate of students who left university without obtaining a
degree. The aim of this paper is, for the first time in Bosnia and Herzegovina, to
contribute to the Education Data Mining field by analyzing the drop out among STEAM
disciplines at the University of Banja Luka. Here are presented and analyzed drop out
rates in STEAM disciplines for 2007-2018 time frame and compared with other European
and world countries. Using regression models for 16.413 students we were able to
explain and predict the most important variables in student churn.
Keywords: drop out, STEM, regression, linear, high education, predict
39
TOXICITY OF DRINKING WATER ASSESSMENT OF THEIR
POTENTIAL RISK TO HUMAN HEALTH
IR SUICA-BUNGHEZ1, RM SENIN1, R STOICA1, ID DULAMA2, IA BUCURICA2, AL BANICA2
1National Institute for Research & Development in Chemistry and Petrochemistry, Bucharest, Romania,
emails: raluca.bunghez@icechim.ro (IRSB); raluca.senin@icechim.ro (RMS); rusandica.stoica@icechim.ro
(RS)
2Valahia University of Targoviste, Institute of Multidisciplinary Research for Science and Technology, 130004
Targoviste, Romania, e-mails: dulama.ioana@icstm.ro (IDD); bucurica_alin@icstm.ro (IAB);
banica.andreea@icstm.ro (ALB)
Abstract
Drinking water is the primary source of toxic metals intake by humans. In Romania,
the water pipes (the majority of them) are made of iron-based alloys and are outdated
and degraded. On the other side, the wells or surface waters - used as the main resource
for drinking water - are affected by environmental pollution. This study aimed to
determine the concentrations of the toxic metal in drinking water, and assess non-
carcinogenic/carcinogenic health risks via daily human intake.
Water samples (from local networks or wells) were collected during the spring
season. The nitrites, nitrates and ammonium content were evaluated using
spectrophotometric methods. Total organic carbon and total nitrogen were performed
thru Multi N/C Analytic Jena Analyzer. The chlorides content was tested using a
titrimetric method and calcination residue thru the gravimetric method. The toxic metal
content is determined by inductive coupled plasma mass spectrometry (ICP-MS).
Estimated daily intake (EDI) and health risk index (HRI) were calculated to assess the
potential risk to human health - adults and children. Another contribution of this study
is the degradation assessment of drinking water pipes.
40
NUMERICAL STUDIES ON AERODYNAMIC PERFORMANCE OF
NACA 0018 PROFILE IN FUNDAMENTAL AND RESEARCH
APPLICATION OF THE AEROSPACE INDUSTRY
ELIZA IOANA APOSTOL1, AUREL MIHAIL TITU2
1 APOSTOL ELIZA-IOANA: University Politehnica of Bucharest, Faculty of Industrial Engineering and Robotics,
313 Splaiul Independenţei, 6 District, Bucharest, Romania, albuelizaioana@yahoo.com
2 TITU AUREL MIHAIL: “Lucian Blaga“ University of Sibiu, 10 Victoriei Street, Sibiu, Romania,
mihail.titu@ulbsibiu.ro
Abstract
This scientific work offers a technical and managerial framework regarding the
presentation of the activities that can be carried out within some research institutions
for a good functioning of the activities carried out within the research institutions in the
aerospace field. The scientific work offers a personal point of view related to the
aerodynamic characteristics of standard metal profiles using the subsonic tunnel for
research. How the research is addressed is based on certain experimental tests
conducted in the laboratory in the aerodynamic tunnel dedicated to such research and
the result is based in the final results that can be reported on a real scale for structural
integrity but also to succeed. of the technical performances of the concept.
Within this scientific work, the issue of fluid separation, resistance and pressure
distribution on the aircraft wing is also addressed. This aspect can allow, that later, we
can bring improvements in the profiles analyzed through the porch and reduce the
resistance to advancement.
The research presented in this scientific work is also presented by the studies
conducted by the authors regarding the geometry of an aircraft of type Naca0018 for
different attack angles and Reynolds numbers. The scientific work was also aimed at
finding technical solutions for improving performance, increasing accuracy and quality
of tests but also increasing the competitiveness of the installations used for such
research.
41
SPECIFIC ASPECTS OF QUALITY AND SAFETY MANAGEMENT IN
AEROSPACE FIELD
ELIZA IOANA APOSTOL1, PETRICĂ TERTEREANU2, IULIANA MOISESCU3, AUREL MIHAIL TITU4
1 APOSTOL ELIZA-IOANA: University Politehnica of Bucharest, Faculty of Industrial Engineering and Robotics,
313 Splaiul Independenţei, 6 District, Bucharest, Romania, albuelizaioana@yahoo.com
2 TITU AUREL MIHAIL: “Lucian Blaga“ University of Sibiu, 10 Victoriei Street, Sibiu, Romania,
mihail.titu@ulbsibiu.ro
3 TERTEREANU PETRICA: County Police Inspectorate Valcea, 95 Calea lui Traian Street, Rm. Valcea, Romania,
tertereanupetrica@yahoo.com
4 MOISESCU IULIANA: Polytechnic University of Bucharest, Ministry of Culture, 22 Unirii Boulevard, 3rd
District, Bucharest, Romania, iuliana_moise@yahoo.com
Abstract
One of the most important technical characteristics of the aerospace field being
safety, through this scientific work we want to define and operationalize concepts such
as security, risk and risk management. Improvement of safety must represent, a
reflection of the management of the first-class risks of the aeronautical industry and the
increasing ability to identify real problems before they become an imminent danger.
Investigations on air accidents and aircraft safety inspections can now be more efficient,
while improved technology and better quality control also make safe aircraft. The
strategy of continuous improvement can be made more precisely to the management
of the aerospace safety that is based on the continuous improvement of the performers
of the aircraft through the use of testing means by certain advanced technical systems.
Safety management can play an extremely important role has the role of analyzing risks
and in addition, it can give the possibility to improve the performance of aircraft in the
real mode. The organizations in the sphere of the analyzed domain have continuously
invested in resources as a way to maintain their survival in a global market, but it can be
stated-something demonstrated in the work-they have difficulty evaluating the effect of
quality improvement processes and more to Identifying certain key factors that can
ensure the expected success in quality assurance. The scientific work provides plus the
required value in the research area and offers the necessary explanations regarding the
management of aerospace safety.
42
TREATMENT OF SALT WATER FORMED DURING DRILLING
OPERATIONS BY ELECTROCOAGULATION
MUHAMMED KAMIL ÖDEN
Department of Environmental Protection Technologies, Sarayönü Vocational High School, Selcuk University,
Konya, Turkiye, Orcid: 0000-0002-0573-5634, muhammedkoden@selcuk.edu.tr
Abstract
In this study, the treatability of wastewater originating from the drilling process in
the salt lake basin, where a natural gas storage area was created, was investigated by
the electrocoagulation (EK) process using iron and copper electrodes. To determine the
optimum operating conditions, the Response-Surface method was used and the
experimental sets were formed by the central composite design. In the optimization
study using the response-surface method, maximum COD, sulfate, chloride, sodium,
magnesium, and Ca/Mg removal were found as a function of current density, reaction
time, and initial pH value affecting the electrocoagulation process. The ANOVA results
showed the fit of the second-order regression with the experimental data. The COD and
Sodium removal were found to be 48 and 25 mA/cm2, the reaction time was 10 and 27
minutes, and the initial pH value was 6 and 10 for iron and copper electrodes,
respectively, under optimum conditions, and removal efficiencies of >82% and >86%
were obtained. Magnesium, sulfate and chloride removal efficiencies were calculated
as 64.31%, 67.42% and 66.95%, respectively, in the treatment with iron-copper
electrode pair. As a result of this study, it has been determined that iron and copper
electrodes and especially COD and sodium pollutants are removed from wastewater
with high removal efficiencies and the response-surface method is a powerful technique
to determine optimum operating conditions in optimization studies. Likewise, it is
successful in removing magnesium, sulfate and chloride contaminants.
Keywords: Electrocoagulation, Removal, RSM, Wastewater, Iron, Copper
Acknowledgments: The experimental part of this study conducted with the iron&copper
electrode was supported by Selcuk University The Scientific Research Coordinator (BAP
No: 20401047).
43
UNPOLARIZED RAMAN SPECTRA SHIFT IN SOLIDIFIED OIL-
WATER-SALTWATER
SH DHOBI1, B KOIRALA2, R WAIBA3, K PAUDEL4, K YADAV5, AK SHAH6, JJ NAKARMI7
1 SH Dhobi: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
saddam@ran.edu.np
2 B Koirala: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
koiralabibek456@gmail.com
3 R Waiba: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
Waiba2016rina@gmail.com
4 K Paudel: Department of Physics, St. Xavier’s College, Tribhuvan University, Kathmandu-44600, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal. kuldippaudel222@gmail.com
5 K Yadav: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
yadavkishori70@gmail.com
6 AK Shah: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal.
runshahpmc@gmail.com
7 JJ Nakarmi: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700,
Nakarmijj@gmail.com
Abstract
The objective of this work is to study the transmittance, absorbance, Raman shift
spectra with unpolarized visible spectrum at low temperature -10 oC of water, soybean
oil and saltwater. The experimental observation shows, those transmittance properties
of decrease with an increase in wavelength, but the absorbance increase with the
increase in wavelength. The nature of transmittance and absorbance was observed as
nonlinear (bumping) because of rotational and vibrational molecules. In addition, the
observation of intensity ratio after and before increase shows two Gaussian peak one in
between 2000cm-1 to 4000cm-1 and another 5000cm-1 to 8000cm-1 for water, soybean
oil and saltwater. The intensity ratio for water and the water-soybean oil-saltwater
sample is greater when observed with Raman spectra shift. This is because of the
polarizability of the molecules is high due to the vibration of the molecules and dipole
moment.
44
MAGNETO-OPTICAL PROPERTIES OF WATER AND SALTWATER
IN PRESENCE OF MAGNETIC FIELD
R WAIBA1, SH DHOBI2, B KOIRALA3, K PAUDEL4, K YADAV5, AK SHAH6, JJ NAKARMI7
1R Waiba: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
Waiba2016rina@gmail.com
2SH Dhobi: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
saddam@ran.edu.np
3B Koirala: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
koiralabibek456@gmail.com
4K Paudel: Department of Physics, St. Xavier’s College, Tribhuvan University, Kathmandu-44600, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal. kuldippaudel222@gmail.com
K Yadav: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
yadavkishori70@gmail.com
5AK Shah: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal.
arunshahpmc@gmail.com
6JJ Nakarmi: Department of Physics, Patan Multiple Campus, Tribhuvan University, Lalitpur-44700, Nepal;
Innovative Ghar Nepal, Lalitpur-44700, Nepal; Robotics Academy of Nepal, Lalitpur-44700, Nepal.
Nakarmijj@gmail.com
Abstract
The magneto-optical (transmittance, absorbance, and reflectance) characteristics of
water and saltwater in the presence of a magnetic field (0T to 0.880T) are investigated
in this study. The authors study Raman spectra shift and the magneto-optical response
of water and saltwater in magnetic fields. In the case of water, the transmittance is high
in a high magnetic field, but in the case of saltwater, the transmittance is low at the low
wavelength of the spectrum. The transmittance of water was found to be 0.7 percent
higher in the presence of a high magnetic field of 0.88T than in the absence of a magnetic
field at the wavelength of 651nm655.67nm. Similarly, under the same magnetic field
(0.88T), the transmittance of seawater was found to be 0.9 percent higher at 401.44nm
and absorbance was found to be 3.4 percent higher at 622.72nm and 646nm. High
magnetic fields, on the other hand, have higher absorbance and reflectance in saltwater
than 0.222T and 0T. The MO response was found to be larger in water at 0.880T than in
saltwater at 0.222T. At 0.880T, the maximal MO response of water and saltwater is
reported to be 0.004983 and 0.009804, respectively, at wavelengths of 668.2 nm and
400 nm. When compared to 0T, the intensity ratio of water is deflected more in a high
magnetic field than in a low magnetic field, whereas the intensity ratio of saltwater is
deflected less in a high magnetic field than in non-magnetic and low magnetic fields.
45
GREEN’S FUNCTION IN QUANTUM STATISTICAL PHYSICS
JOVAN P. ŠETRAJČIĆ1, STEVO K. JAĆIMOVSKI2, SINIŠA M. VUČENOVIĆ3
1Academy of Sciences and Arts of Republic of Srpska, Banja Luka, Republic of Srpska, Bosnia and
Herzegovina, jovan.setrajcic@gmail.com;
2University of Criminal Investigation and Police Studies, Zemun Belgrade, Serbia, jacimovskis@gmail.com;
3University of Banja Luka, Faculty of Natural Sciences and Mathematics, Banja Luka, Republic of Srpska,
Bosnia and Herzegovina, sinisa.vucenovic@pmf.unibl.org
Abstract
One of the very popular, powerful and reliable theoretical methods of research in
quantum statistical physics or solid-state physics is the Green's functions method. This
method represents a completely closed formalism, where in this framework one can
completely solve the problem of particle and quasiparticle systems, i.e. calculate the
energies and lifetimes of elementary excitations and, as well as the statistical mean
values of the corresponding physical quantities. This makes it one of the most efficient
instruments of theoretical analysis of phenomena in condensed matter. Green's
functions depend on both spatial and time variables, this method could also be applied
to the study of specific and unusual properties of nanostructured samples. In this paper,
we have introduced the general - definition procedure of the theory of Green's functions
and the way of manipulating it to calculate the properties of the observed physical
system. In the second part, this procedure will be demonstrated in the determination of
the temperature dependence of magnetization in ferromagnetic and in the analysis of
the optical properties of molecular crystals.
Keywords: Quantum statistical physics, Green's functions, correlation functions, Pauli
operators, magnetization, kinematic optical excitations.
46
MICROSTATES OF ELEMENTARY EXCITATIONS IN SANDWICH
NANO-STRUCTURES
JOVAN P. ŠETRAJČIĆ1, SINIŠA VUČENOV2
1 Academy of Sciences and Arts of Republic of Srpska, Banja Luka, Republic of Srpska Bosnia and
Herzegovina, jovan.setrajcic@gmail.com;
2 University of Banja Luka, Faculty of Natural Sciences and Mathematics, Banja Luka, Republic of Srpska
Bosnia and Herzegovina, sinisa.vucenovic@pmf.unibl.org
Abstract
This paper analyzes micro-characteristics (single-particle wave functions, the
dispersion law of elementary excitations) of sandwich nano-structures. Such structures
have exceptional properties and have become current issues in the light of recent
discoveries in structures such as boron nitride-graphene-boron nitride. In our case,
structures with a simple cubic lattice are analyzed, but the results can be applied to the
structures with monoclinic and triclinic lattices.
Keywords: Sandwich nano-structure, one-particle wave function, dispersion spectra of
elementary excitations.
47
MATERIALS ENGINEERING
48
49
NEW METHODS OF WELDING THIN STEEL PLATES USING
PULSED CURRENT
AUTHORS: L. ZGRIPCEA, M. ARDELEAN, V. PUTAN AND C. BIRTOK BĂNEASĂ
Politehnica University of Timisoara, Department Engineering and Management, Hunedoara, Romania,
laurentiu.zgripcea@student.upt.ro
Abstract
The paper presents new technology of welding thin steel plates using pulsed weld
currents. Trials were focused on optimization of current parameters (peak current, base
current, ratio and frequency) in order to obtain a better weld shape measured in section.
Another scope of the study was to optimize the pulse frequencies versus plate thickness.
50
Sustainable Development Indicators in the Steel Industry
AUTHORS: I., FĂRCEAN, G., PROȘTEAN, AND A., SOCALICI
Affiliation of authors
I., Fărcean: University Politehnica of Timisoara/ Faculty of Management in Production and
Transportation, Timisoara, Romania, ioana.farcean@student.upt.ro
G., Proștean: University Politehnica of Timisoara/ Faculty of Management in Production and
Transportation, Timisoara, Romania, gabriela.prostean@upt.ro
A., Socalici: University Politehnica of Timisoara/Faculty of Engineering Hunedoara, Hunedoara, Romania,
virginia.socalici@fih.upt.ro
Abstract
Sustainability indicators of the steel industry, developed by WorldSteel, measure the
performance of sustainability in the social, economic, and environmental field. They
provide a wide perspective on the effects of steel plants. The activity of measuring and
monitoring indicators makes significant contributions to the process of implementing
and increasing sustainability in the steel sector. Most steel companies voluntarily
provide data on sustainability, including CO2 emissions and the frequency of accidents
over time. The paper presents an analysis of the indicators for the sustainability of steel
companies, based on data provided by the WorldSteel Association. Particular attention
was paid to the pandemic period, the period that had a different influence on the
indicators analyzed.
51
ON THE MODIFICATION OF THE CAVITATION RESISTANCE OF
THE ALUMINUM ALLOY 2017 A, THROUGH THE PARAMETERS
OF THE HEAT TREATMENT OF AGING
CL SALCIANU, C GHERA, I BORDEAȘU, B GHIBAN, M L MICU, I DIONISIE, O.P. ODAGIU AND A LUCA7
1Politehnica University of Timisoara, Timisoara, Romania, ilarica59@gmail.com,
2 Politehnica University of Timisoara, Timisoara, Romania, cghera@yahoo.com,
3 University of Agricultural Sciences and Veterinary Medicine of Banat King Mihai I from Romania,
laviniapetanec@yahoo.com
4 Politehnica University of Timisoara, Timisoara, Romania, salcianu.laura@yahoo.com
5 Politehnica University of Bucharest, Bucuresti, Romania, dionisieistrate@yahoo.com
6 Politehnica University of Timisoara, Bucuresti, Romania, ghibanbrandusa@yahoo.com,
7 Politehnica University of Timisoara, Timisoara, Romania, alexandruluca03@gmail.com,
Abstract
The aluminum based alloy type 2017 A is characterized by high values of mechanical
properties, which is why it is used for parts subjected to various mechanical stresses, in
the fields of automotive, aviation and even hydraulic equipment. Lately, as a result of
the evolution of machines and mechanical processing processes, its application to high-
speed propeller blades and rotors of heat engine cooling pumps has been sought. As
these parts work in cavitation mode, in order to increase the resistance to erosion
created by micro-jets and shock waves, specialists are investigating the effect of various
techniques applied for this purpose. The results of the research on the behavior and
strength of the 2017A alloy, heat treated by three aging regimes (1800C, 1400C și 1200C),
with the same maintenance duration (24 hours), to the erosion produced by the
cavitation generated by vibration are also included in this direction. The analysis of
surface degradation, performed based on photographic images from various times and
microscopic ones at the end of the cavitation attack, as well as based on the evolution
of characteristic curves and parameter values recommended by ASTM G32-2016, it is
found that the most appropriate treatment is from 120°C.
52
INSIGHT INTO THE ELECTRO-OPTICAL BEHAVIOR OF
CARBAZOLE-BASED DONOR-ACCEPTOR OLIGOMERS
AUTHORS: 1M. SOROCEANU, 2C.-P. CONSTANTIN AND 3M.-D. DAMACEANU
Affiliation of authors
1Marius Soroceanu “Petru Poni” Institute of Macromoecular Chemistry, Aleea Grigore Ghica Voda 41A,
700487, Iasi Romania soroceanu.marius@icmpp.ro
2Catalin-Paul Constantin “Petru Poni” Institute of Macromoecular Chemistry, Aleea Grigore Ghica Voda 41A,
700487, Iasi Romania constantin.catalin@icmpp.ro
3Mariana-Dana Damaceanu “Petru Poni” Institute of Macromoecular Chemistry, Aleea Grigore Ghica Voda
41A, 700487, Iasi Romania damaceanu@icmpp.ro
Abstract
Organic compounds containing carbazole moieties attracted large interest in the
recent years due to the easy functionalization of this heterocycle, their structural and
other useful characteristics, such as light-emitting and hole-transporting ability, that
recommend the use of these materials in optoelectronic applications. Carbazole-based
derivatives were applied either as small molecules or polymer-based active layers in
various devices, such as OLEDs, solar cells or transistors.1 On the other hand, imine-
based conjugated compounds as alternatives to the vinylene counterparts in the
growing field of organic electronics2 received considerable interest due to their
straightforward synthesis and appealing semiconducting and optoelectronic properties.
When carbazole as an electron donor unit is integrated with an electron acceptor unit
like naphthylimide through the imine bond, a donor-acceptor (D-A) architecture is
obtained, which is expected to display unique optoelectronic features.
In this regard, the present work is focused on the synthesis of two D-A imines based
on carbazole and naphthylimide and their advanced characterization. Due to their
donor-acceptor topology, intramolecular charge-transfer transitions were generated.
The morphologies of the thin films prepared from these compounds, varied functions
on the solvent utilized for deposition. Besides high thermal stability, the investigated
films exhibited both p- and n-type doping capabilities, and hence ambipolar charge
transport properties. Based on electrochemical data, the bandgap energy of the
oligomers was determined and then compared to that obtained by the Tauc method.
The findings of this study may contribute to the knowledge of the D-A imines and their
use as active layers in optoelectronic applications.
Acknowledgments
This work was supported by a grant of the Ministry of Research, Innovation and
Digitization, CNCS/CCCDI UEFISCDI, project number PN-III-P1-1.1-PD-2019-1026,
within PNCDI III
53
RADIOGRAPHIC FILM WASTE MANAGEMENT AND RECOVERY
Ardelean Erika1, Ardelean Marius2, Galfi Corina3, Socalici Ana4, Josan Ana5
1 University of Timisoara, Faculty of Engineering Hunedora, Romania, erika.ardelean@fih.upt.ro
2 University of Timisoara, Faculty of Engineering Hunedora, Romania, marius.ardelean@fih.upt.ro
3 Dragomir Hurmuzescu” Energy Technological High School Deva, Romania, galfi.corina@gmail.com
4 University of Timisoara, Faculty of Engineering Hunedora, Romania, virginia.socalici@fih.upt.ro
5 University of Timisoara, Faculty of Engineering Hunedora, Romania, ana.josan@fih.upt.ro
Abstract
Health facilities in Romania generate hundreds of thousands of tons of medical
waste (hazardous and non-hazardous) annually. It is, therefore, necessary to apply
rigorous management of this waste, in compliance with applicable regulations,
especially in the case of waste with a high potential for harmfulness. In the context of
the global PANDEMIC of COVID 19, the amount of radiographic films generated has
increased, using the classic variant when the modern investigative devices was no longer
available. The legislation requires hospitals and clinics to follow certain rules regarding
the management of X-ray films. These are considered private information and must be
managed according to the legislation, but silver and other chemicals in the film are toxic
to the environment when disposed of uncontrolled. Recycling companies prefer to
recover silver from effluents used to obtain classical radiography, a recovery that is done
by electrolysis and does not require large investments.
The paper presents a relatively simple technology of recycling the radiographic films
starting from laboratory studies, by leaching them in sodium hydroxide solution and the
implications from the point of view of managing such activities.
Keywords: Waste management, Radiographic films, Recycling
54
APPLICATION OF LASER SURFACE WELDING IN TOOL
REPAIRING
DRAGOSLAV DOBRAŠ1, MILISAV MARKOVIĆ2, JOVAN MARIĆ3
1University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, Bosnia and Herzegovina,
dragoslav.dobras@mf.unibl.org
2University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, Bosnia and Herzegovina,
milisav.markovic@mf.unibl.org
3 Mandeks Modeling d.o.o. Laktaši, jovanmaric120124@gmail.com
Abstract
Tool steels are carbon steels or alloy steels, with a carbon content greater than 0.6%,
intended for cold or hot operation. They are required to have sufficient toughness and
the required hardness of the surface layer, which is achieved by subsequent heat
treatment. Although tool steels are of increased hardness, wear occurs during
operation, which causes defects in the product. Tool sharpening is reflected in the
reduction of volume, and in some cases requires re-heat treatment. To preserve the
volume of the tool, worn surfaces can be welded. Due to the high carbon content and
previous heat treatment, tool steels belong to the group of hard-to-weld steels. The
analysis of the structure and hardness of weld and HAZ achieved by laser surface welding
process on steel marked 1.2343 in the raw state and previously hardened to a hardness
of 52 HRC was performed.
Keywords: tool steel 1.2343, laser surface welding, the structure of weld and HAZ
55
SURFACE WELDING TECHNOLOGY IN REPAIR OF CAST IRON
CASTINGS G42CRMO4
MILISAV MARKOVIĆ1, DRAGOSLAV DOBRAŠ2, SLAVIŠA SAVIĆ3
1University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, Bosnia and Herzegovina,
milisav.markovic@mf.unibl.org
2University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, Bosnia and Herzegovina,
dragoslav.dobras@mf.unibl.org
3University of Banja Luka, Faculty of Mechanical Engineering, Banja Luka, Bosnia and Herzegovina,
slavisa.savic@mf.unibl.org
Abstract
Steel castings are used to make parts of complex shape and specific requirements
for mechanical properties. During casting, imperfections can occur which can be
repaired by welding, depending on the size and type of imperfection, as well as the
conditions of exploitation of the casting. Due to the high carbon content and previous
heat treatment, cast iron marked G42CrMo4 belongs to the group of difficult-to-weld
steel materials. The paper presents the surface welding technology as well as the results
of the surface welding technology qualification.
Keywords: surface welding, G42CrMo4, surface welding technology qualifications
56
GEOMETRY AND COMPOSITION OF DUST PARTICLES IN
DENTAL LABORATORIES
BORUT KOSEC1,2, ZORANA TANASIĆ3, MILANA ILIĆ MIĆUNOVIĆ4, VALENTINA VESELINOVIĆ5, GORAN
JANJIĆ3, ALEŠ NAGODE1
1University of Ljubljana, Faculty of Natural Sciences and Engineering, Aškerčeva c. 12, 1000 Ljubljana,
Slovenia borut.kosec@ntf.uni-lj.si
2University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva c. 6, 1000 Ljubljana, Slovenia
3University of Banja Luka, Faculty of Mechanical Engineering, S.Stepanovića 71, 78000 Banja Luka, RS, BiH
4University of Novi Sad,Faculty of Mechanical Engineering, Trg D. Obradovića 6, 21000 Novi sad, Serbia
5University of Banja Luka, Faculty of Medicine, S.Mrkalja 14, 78000 Banja Luka, RS, BiH
Abstract
When working in dental laboratories, dust particles are formed, which in most cases
have a negative effect on the health of those who are exposed to them. Their impact is
determined by measuring the number of particulate matter emissions, particle
geometry, particle chemical composition, and particle size and their size distribution.
The methods for measuring and evaluating these parameters are regulated by the
standard ISO 13322-1.
In our study, the emitted particles were performed with the personal particle
sampler EGO PLUS TT, the weighing of the particles was performed on an electronic
balance, while particle size, their geometry and chemical composition were determined
with a field emission scanning electron microscope.
Keywords: Dental laboratory, Materials, Dust particles, Measurements, Analysis,
Geometry, Composition
57
HEAT TRANSFER PARAMETERS IN THE MELT-SPINNING
PROCESS
BLAŽ KARPE1, BORUT KOSEC1,2, MIRKO GOJ3, MILAN BIZJAK1
1 University of Ljubljana, Faculty of Natural Sciences and Engineering, Aškerčeva cesta 12, 1000 Ljubljana,
Slovenia
2 University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva cesta 6, 1000 Ljubljana, Slovenia,
borut.kosec@ntf.uni-lj.si
3 University of Zagreb, Faculty of Metallurgy, Aleja narodnih heroja 3, 44103 Sisak, Croatia
Abstract
In the case of continuous casting of metal ribbons with the melt-spinning process on
the industrial scale, a larger quantity of melt could lead to slow excessive warming of
the chilling wheel, which would further lead to the solidification of a ribbon at non-
uniform conditions and increased wearing of the wheel. The primary goal of our work
was to determine to what extent the release of heat during contact of the melt/ribbon
on the circumferential surface of the chilling wheel affects its surface temperature rise,
and inversely how much elevated temperature of the chill wheel surface affects on
metal ribbon cooling rate and its solidification velocity.
Based on a developed mathematical model, a computer program was made and
used for analyses of heat transfer in the melt-spinning process. The calculations show
that contact resistance between metal melt and the chilling wheel has a great influence
on melt/ribbon cooling and chill wheel heating rate, and must not be neglected in
numerical calculations, even if its value is very low. In the case of continuous casting, a
significant “long-term” surface temperature increase may take place, if the wheel is not
internally cooled. But inner cooling is effective only if wheel casing thickness is properly
chosen.
A new method for determining contact resistance through variable heat transfer
coefficient is introduced which takes into account physical properties of the casting
material, process parameters and contact time/length between metal melt/ribbon and
substrate and enables cooling rate prediction before the experiment execution. In the
case of continuous casting, the heat balance of the melt-spinning process is calculated
and the influence of the chill wheel cooling mode on the cooling rate of the metallic
ribbon is analyzed.
Keywords: Melt-spinner, Heat Transfer, Metallic Materials, Rapid Solidification,
Modeling, Heat Transfer Coefficient
58
THERMAL PROPERTIES OF METAL DENTAL MATERIALS
BORUT KOSEC1,2, MATEJA VODLAN3,1, BLAŽ KARPE1, ALENKA PAVLIČ4, ALEŠ NAGODE1
1 University of Ljubljana, Faculty of Natural Sciences and Engineering, Aškerčeva cesta 12, 1000 Ljubljana,
Slovenia, borut.kosec@ntf.uni-lj.si
2 University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva cesta 6, 1000 Ljubljana, Slovenia
3 LEK d.d., Verovškova 57, 1526 Ljubljana, Slovenia
4 University of Ljubljana, Faculty of Medicine, Korytkova 2, 1000 Ljubljana, Slovenia
Abstract
The mechanical properties and microstructure of the most conventional metal
dental alloys are relatively well known, while data on thermal properties are not
available. In the frame of our investigation work, the thermal properties of titanium alloy
TiAl6V4 and CoCr alloy will be determined.
In the first part of the work, a study and evaluation of the operation of the device for
determining the thermal properties of Hot Disk TPS 2200, today one of the most modern
and high-quality instruments for determining thermal properties will be done.
In the second part of the work, the measurements and analysis of thermal properties
(thermal conductivity, specific heat and temperature conductivity) of both alloys:
TiAl6V4 and CoCr following the standard ISO 22007-2 at ambient and elevated
temperatures will be done.
Keywords: Thermal properties, Dental materials, Measurements
59
MEASUREMENT OF THERMAL CONDUCTIVITY OF THE
CORTICAL BONE: EXPERIMENTAL STUDIES AND
COMPARATIVE ANALYSIS
PAWEŁ ZAWADZKI 1,*, ADAM PATALAS 1, REMIGIUSZ ŁABUDZKI 1, RAFAŁ TALAR 1
1 Poznan University of Technology, Piotrowo 3, Poznan 60-965, Poland, pawel.zawadzki@put.poznan.pl
Abstract
Thermal conductivity is an ambiguous material property of bone tissue that directly
impacts the surgical procedure and the patient's convalescence (thermal necrosis). The
study aimed to determine the thermal coefficient experimentally and compare the
results with previous results. The comparative method was used with the reference
material, PMMA, with a coefficient value of 0.167 W*(mK)-1 to measure the thermal
conductivity. Thanks to the obtained results, the thermal diffusivity coefficient was also
determined. The results allowed us to choose the coefficient of thermal conductivity at
the level: 0.26-0.34 W*(mK)-1 and thermal diffusivity: 0.103-0.135 mm2*s-1. The
confrontation of the results established their compliance with the latest research. The
thermal conductivity coefficient varies depending on the condition of the tissue (dry or
fresh) and its porosity. Due to its anisotropic structure, bone tissue can change its
thermal properties depending on its location (body or head). Further extensive
experimental evaluation of these properties is required.
Keyword: thermal conductivity, thermal diffusivity, cortical bone, thermal necrosis
60
SCIENCE OF METALS THROUGH STORY OF TTT DIAGRAMS
AND MICROSTRUCTURES
BELMA FAKIĆ1, ADISA BURIĆ1, EDIB HOROZ1
1University of Zenica, Zenica, Bosnia and Herzegovina, belma.fakic@unze.ba
1University of Zenica, Zenica, Bosnia and Herzegovina, adisa.buric@unze.ba
1University of Zenica, Zenica, Bosnia and Herzegovina, edib.horoz@unze.ba
Abstract
Metallic materials based on iron have a very wide possibility of changing their
properties. The properties are related to the temperature and chemical composition of
alloys. In this paper will be to present a little story and micrographs of the possibility to
get some properties from the same chemical composition of steel 16MnCr5 which is an
engineering material typically used to manufacture piston bolts, camshafts, levers, and
other vehicle and mechanical engineering components. A combination TTT diagram,
Jominy curve, and microstructures give a good view of a metallic material.
61
METALLOGRAPHIC ANALYSIS OF PRECIPITATION HARDENED
STATE RH950 STEEL 17-7PH OF MODIFIED CHEMICAL
COMPOSITION
BELMA FAKIĆ1, DIANA ĆUBELA1
1University of Zenica, Zenica, Bosnia and Herzegovina, belma.fakic@unze.ba
1University of Zenica, Zenica, Bosnia and Herzegovina, diana.cubela@unze.ba
Abstract
Aging is a relatively low-temperature thermal treatment that hardens the material
by precipitation secondary phases from a solid solution. The first degree of hardening of
steel 17-7PH is the transformation of austenite into martensite. Cryogenic heat
treatment of this material gives possibilities to get an appropriate combination of
martensite and austenite.
62
CHEMICAL PROCESSES FOR THE SYNTHESIS OF PVDF-CNT-
CO3O4 NANOCOMPOSITE
V. ȚUCURREANU1, G. CRĂCIUN2, C. ROMANIȚAN3, C. MIHĂILESCU4, A. MATEI5
1National Institute for Research and Development in Microtechnologies, Bucharest, Romania,
vasilica.tucureanu@imt.ro
2National Institute for Research and Development in Microtechnologies, Bucharest, Romania,
gabriel.craciun@imt.ro
3National Institute for Research and Development in Microtechnologies, Bucharest, Romania,
cosmin.romanitan@imt.ro
4National Institute for Research and Development in Microtechnologies, Bucharest, Romania,
carmen.mhailescu@imt.ro
5National Institute for Research and Development in Microtechnologies, Bucharest, Romania,
alina.matei@imt.ro
Abstract
Recently, there has been a growing interest in the integration of oxide nanoparticles
with carbon materials, creating the premises for the development of composite
materials that can be used in applications in the field of sensors (gas, biosensors),
storage media (lithium-ion batteries, storage hydrogen) combustion cells (catalyst
support), solar cells, etc. This article refers to processes for the synthesis of Co3O4
(cobalt (II, III) oxide) nanoparticles, purification and oxidation of CNTs (carbon
nanotubes) and incorporation into the polymer matrix of PVDF (poly (vinylidene
fluoride)) to develop nanocomposites with improved properties for electrochemical
applications. Co3O4 was obtained by the co-precipitation method, the carbon material
was purified and oxidized using acid mixtures. The ex-situ method was used for the
synthesis of the PVDF-CNT-Co3O4 nanocomposite. The structure and morphology of the
developed nanomaterials were studied using FTIR and EDX spectroscopy, X-ray
diffraction, and SEM microscopy. From the structural point of view, the formation of
high purity Co3O4 was found, purification and oxidation of CNTs and embedding in the
polymeric matrix without the structural change of the filler materials. SEM microscopy
revealed nanostructuring of fillers and embedding them in the polymer matrix. The
percolation capacity of the PVDF-CNT-Co3O4 nanocomposite was determined using the
goniometric method. The ability of PVDF-CNT-Co3O4 nanocomposites to store charge
was evaluated via cyclic voltammetry.
63
ANALYSIS OF YELBEYI (BOZKIR TURKEY) MANGANESE
MINERALIZATION WITH GEOSTATISTICAL METHODS
ALICAN OZTURK1, BILGEHAN YABGU HORASAN*2 ABDÜLHEKIM DEMIR1
1Konya Technical University, Geological Engineering Department, Selçuklu, Konya, Turkey
alicanozturktr@gmail.com, https://orcid.org/0000-0003-2748-6322
2Selcuk University Sarayonu Vocational School of Higher Education Department of Environmental Protection
and Technologies Sarayonu / Konya, bilgehanyabgu@gmail.com, https://orcid.org/0000-0003-1899-0041
Abstract
Rapidly developing technology and accordingly, the need for raw materials cause
new alternative research all over the world. The demand for manganese, which is the
basic material of iron and steel, agriculture and energy sectors, is increasing every year.
The deposits, which have low values in terms of grade and reserve, have gained
economic value due to the development of technology, new production methods and
increasing demands.
In this study, the genesis and formation mechanism of the mineralization were
investigated by using geostatistical-geochemical methods of manganese mineralizations
in Yelbeyi (Bozkır-Turkey) region. For this purpose, chemical analysis (main-oxide and
trace element) concentration values of the samples collected from the region and basic
statistical methods, as well as Cluster / AHC, PCA (main component analysis-TBA),
correlation and factor analyzes were carried out. According to the correlation analysis,
there is a positive correlation between MnO and Ba, Cs, Ga, Sr, Cr2O3 and Na2O; there is
a negative correlation relationship between Ce, Nb and Nd. These relationships were
also found to be significant in the regression analysis. According to the results of the
Cluster/AHC analysis, the components were grouped into 4 groups. Manganese
formation was included in Group 3. Factor analysis was performed on manganese
mineralizations and the first 7 factors (eigen values > 1) of the components constituting
91.41% of the total variation were evaluated. According to the PCA analysis, it was
determined that MnO in the 1st region and SiO2 in the 2nd and 3rd regions were
effective and had similar characteristics. Genetically, the mineralization in the region is
located in a close region of the hydrothermal area due to its low Al and Fe and high Mn
content. In addition, the mineralizations in the region remain within the hydrothermal
area according to the U-Th diagram.
Keywords : AHC, PCA, Geostatistics, Manganese, Bozkır
64
TECHNOLOGICAL DETAILS ABOUT THE DEOXIDATION OF
STEELS ON AN EBT-LF-MTC TECHNOLOGICAL FLOW
RADU1, HEPUT1, ERICA ARDELEAN1, MARIUS ARDELEAN1
1 Politehnica University of Timisoara, Engineering and Management Department, 5 Revolution Street,
Hunedoara, 331128, Romania, mihairadu_66@yahoo.com
Abstract
The extremely rapid progress of continuous steel casting, both metallurgically and
in terms of plant construction, has allowed this process to spread widely in the industry.
Concerns in this area relate mainly to the possibility of increasing the amount of cast
steel and improving its quality. The research considered a weak alloy steel brand S275JO
with the addition of titanium developed on an EBT-LF-MTC technological flow, in an EBT
type oven with a capacity of 100 tons and cast on MCT with 5 wires. The paper presents
the results of research on the variation of titanium oxide contents contained in the slags
taken from processing in the LF pot and the slag deposited on the immersion tubes from
continuous casting to the last batch of the casting sequence. Based on the research
conducted, it was possible to establish the causes that cause deviations from the
required chemical composition as well as defects in the casting process. The results
obtained have applicability in research and practice.
65
STUDY OF DISC−SHAPED ZNO BASED VARISTORS DOPED WITH
V2O5, SB2O3, CO3O4, SNO2, AND CR2O3
M. V. LUNGU1, A. CARAMITU2, D. PĂTROI3, V. MARINESCU4, G. SBARCEA5, M. LUCACI6, M. MARI7,
D. TĂLPEANU8 AND P. GODEANU9
1 National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA),
Bucharest, Romania, magdalena.lungu@icpe-ca.ro
2 INCDIE ICPE-CA, Bucharest, Romania, alina.caramitu@icpe-ca.ro
3 INCDIE ICPE-CA, Bucharest, Romania, delia.patroi@icpe-ca.ro
4 INCDIE ICPE-CA, Bucharest, Romania, virgil.marinescu@icpe-ca.ro
5 INCDIE ICPE-CA, Bucharest, Romania, gabriela.sbarcea@icpe-ca.ro
6 INCDIE ICPE-CA, Bucharest, Romania, mariana.lucaci@icpe-ca.ro
7 INCDIE ICPE-CA, Bucharest, Romania, mihai.marin@icpe-ca.ro
8 INCDIE ICPE-CA, Bucharest, Romania, dorinel.talpeanu@icpe-ca.ro
9 Maira Montaj SRL, Bucharest, Romania, petre@maira.ro
Abstract
This study outlines the effects of additives on the microstructure and properties of
some disc−shaped metal oxide varistors (MOVs) (Ø28 mm x 12 mm) manufactured by
powder metallurgy. The molar content of MOV powders was designed as 97.5 % ZnO
and 4 dopants (0.5 % V2O5 + 0.5 % Sb2O3 + 0.5 % Co3O4 + 1 % SnO2, denoted as
MOV−D4) or 5 dopants (0.5 % V2O5 + 0.5 % Sb2O3 + 0.5 % Co3O4 + 0.5 % SnO2 + 0.5 %
Cr2O3, denoted as MOV−D5). The crystalline nature of the sintered and annealed MOVs
was revealed by X−ray diffraction (XRD), scanning electron microscopy, and UV−Vis
spectroscopy. The Rietveld refinement of the XRD data disclosed a majority phase of
ZnO (82.99−83.22 wt.%) with a crystallite size of 138.5−155.2 nm, and a minority phase
of Zn(Zn1.1Co0.23Sb0.61)O4 (16.7817.01 wt.%) with a crystallite size of 95.0−120.4
nm. All MOVs exhibited homogeneous microstructure, absorbance maxima in UV and
visible regions, and a lower direct band gap (1.954−2.123 eV) than that of bulk ZnO (3.37
eV). Low apparent porosity (3.2−5 %) and high bulk density (min. 5.15 g/cm3) were
determined by the water displacement method. The MOVs with Ag electrodes on both
planes surfaces yielded nonlinear electrical properties with leakage current densities up
to 0.2 mA/cm2 in AC testing at 1001300 V, high relative permittivity (299−474), and
low dissipation factor (0.272−0.3) at 1 kHz that are suitable for medium voltage surge
arresters.
Acknowledgments
This work was supported by the Romanian Ministry of Research, Innovation and
Digitalization (MCID), CCCDI-UEFISCDI, project number PN-III-P2-2.1-PED-2019-5337,
contract number 327 PED/2020 “Development of reliable metal oxide varistors for the
enhancement of the protective effect of surge arresters” within PNCDI III, and project
66
number 25PFE/30.12.2021 “Increasing R-D-I capacity for electrical engineering-specific
materials and equipment with reference to electromobility and "green" technologies”
within PNCDI III, Programme 1.
SPARK PLASMA PROCESSING OF ALCOCRFENI2.1 HIGH
ENTROPY ALLOY
M. LUCACI1, M. V. LUNGU2, D. TĂLPEANU3, V. TSAKIRIS4, V. MARINESCU5, G. SBARCEA6, M.
MARIN7, D. CIRSTEA8
1 National Institute for Research and Development in Electrical Engineering ICPE-CA (INCDIE ICPE-CA),
Bucharest, Romania, e-mail: mariana.lucaci@icpe-ca.ro
2INCDIE ICPE-CA, Bucharest, Romania, e-mail: magdalena.lungu@icpe-ca.ro
3INCDIE ICPE-CA, Bucharest, Romania, e-mail: dorinel.talpeanu@icpe-ca.ro
4INCDIE ICPE-CA, Bucharest, Romania, e-mail: violeta.tsakiris@icpe-ca.ro
5INCDIE ICPE-CA, Bucharest, Romania, e-mail: virgil.marinescu@icpe-ca.ro
6INCDIE ICPE-CA, Bucharest, Romania, e-mail: gabriela.sbarcea@icpe-ca.ro
7INCDIE ICPE-CA, Bucharest, Romania, e-mail: mihai.marin@icpe-ca.ro
8INCDIE ICPE-CA, Bucharest, Romania, e-mail: diana.cirstea@icpe-ca.ro
Abstract
The paper presents the research results obtained for AlCoCrFeNi2.1 high entropy alloy
(HEA) processed by a modern powder metallurgy technology such as spark plasma
sintering (SPS) of the mechanically alloyed HEA powder for 30 hours. The fast
consolidation of the HEA powder by the SPS process was performed under vacuum, at a
pressure of 60 MPa, a sintering temperature of 1000oC with a dwell time of 5 minutes,
and a heating/cooling rate of 100oC/min, so that cylindrical samples with a diameter of
20 mm and a height of 3−4 mm were obtained. The field−assisted sintering was
conducted using two different DC pulsed current schemes, in which the pulse duration
(ms), the pause between pulses (ms), the number of pulses on a spark, and the pause
between sparks (ms) were varied. The synthesized materials were characterized from
the point of view of microstructural evolution and mechanical properties behavior. The
obtained sintered materials present a multiphase structure consisting of at least a
majority fcc solid solution, and a minority bcc solid solution. The microstructure of the
developed HEA materials consists of at least two types of equiaxed grains highlighted by
different colors. The sintered materials have a value of the yield strength (YS = 1.5 GPa)
very close to that of the compressive strength of 1.7 GPa, proving that the synthesized
materials exhibit an elastic deformation behavior in all the range of the applied stresses.
Acknowledgments
67
This work was supported by the Romanian Ministry of Research, Innovation and
Digitalization (MCID), CCCDI-UEFISCDI, project number PN-III-P2-2.1-PED-2019-5337,
contract number 327 PED/2020 – “Development of reliable metal oxide varistors for the
enhancement of the protective effect of surge arresters” within PNCDI III, contract
number 46N/2019, project PN number 19310102/2019 Advanced metallic materials
and micro/nanostructured composites with high-performance properties for practical
applications in priority areas within Core Programme 2019 2022, and project number
25PFE/30.12.2021 “Increasing R-D-I capacity for electrical engineering-specific
materials and equipment with reference to electromobility and "green" technologies”
within PNCDI III, Programme 1.
68
STUDY OF THE CAVITATION BEHAVIOR OF THE 7075
ALUMINUM ALLOY STRUCTURE BY AGING TREATMENT
N. LUCA1, I BORDEASU2, L M MICU3, C GHERA4, B. GHIBAN5, A.M. DEMIAN6 AND A .D. BUZATU7
1 Politehnica University of Timisoara, Timisoara, Romania, alexandruluca03@gmail.com
2 Politehnica University of Timisoara, Timisoara, Romania, ilarica59@gmail.com,
3 University of Agricultural Sciences and Veterinary Medicine of Banat King Mihai I from Romania,
laviniapetanec@yahoo.com
4 Politehnica University of Timisoara, Timisoara, Romania, cghera@yahoo.com,
5 Politehnica University of Bucharest, Bucuresti, Romania, ghibanbrandusa@yahoo.com,
6 Politehnica University of Bucharest, Bucuresti, Romania, demianalin96@yahoo.com
7 Politehnica University of Bucharest, Bucuresti, Romania,buzatuandreead@yahoo.com
Abstract
Aluminum-based alloy type 7075 is known for its good ductility, high mechanical
strength, toughness and high fatigue strength, which is why it is mainly used in the
construction of dynamically stressed parts in the structure of airplanes, vehicles, and
ships. Although it has these qualities, at present its behavior has not been studied at the
hydrodynamic stresses that allow it to be used in parts that work in cavitation
conditions, such as pump rotors and boat propeller blades. Therefore, the research in
this paper highlights the behavior of laminated semi-finished structures and obtained
by heat treatment of artificial aging at 180°C, with a maintenance time of one hour. of
the 7075 alloys at the demands generated by the vibrating cavity, created by the
standard vibrating device with piezoceramic crystals (frequency of 20 kHz, amplitude of
50 µm and electrical power of 500 W). Analysis based on the curves MDE (t) and MDER
(t), of the specific parameters of cavitation erosion MDEmax and MDERs as well as of
the macro and microscopic images of the eroded structures of cavitation show that,
compared to the delivered state (semi-finished), by the heat treatment applied the
microstructure does not change cavitation.
69
AGEING MAINTAINING TIME INFLUENCE OF CAVITATION
RESISTANCE OF 6082 ALUMINUM TYPE ALLOY
C GHERA1, I DIONISIE2, I BORDEAȘU3, B GHIBAN4, O P ODAGIU5, CL SALCIANU6, M L MICU7, A
LUCA8
1 Politehnica University of Timisoara, Timisoara, Romania, cghera@yahoo.com
2 Politehnica University of Bucharest, Bucuresti, Romania, dionisieistrate@yahoo.com
3 Politehnica University of Timisoara, Timisoara, Romania, ilarica59@gmail.com,
4 Politehnica University of Timisoara, Bucuresti, Romania, ghibanbrandusa@yahoo.com,
5 Politehnica University of Timisoara, Bucuresti, Romania, ghibanbrandusa@yahoo.com
6 Politehnica University of Timisoara, Timisoara, Romania, salcianu.laura@yahoo.com
7 University of Agricultural Sciences and Veterinary Medicine of Banat King Mihai I from Romania,
laviniapetanec@yahoo.com
8 Politehnica University of Timisoara, Timisoara, Romania, alexandruluca03@gmail.com
Abstract
The use of aluminum-based alloys in components of thermal machines, and
hydraulic machines, which work in cavitation currents, required the finding of solutions
to reduce the erosive effect of the surface eroded by micro-jets and shock waves
produced during cavitation. In this direction is also included the research of the
resistance to vibration cavitation erosion of alloy 6082 subjected to heat treatment of
aging at 180°C, with three durations of the heat regime (one hour, 12 hours and 24
hours), generated by the standard vibrating device, with crystals. piezoceramic, from
the Cavitation Erosion Research Laboratory, of the Polytechnic University of Timișoara.
The results of the research, compared to the gauge sample, taken from the rolling state,
and analyzed based on the curves and parameters recommended by the ASTM G32-
2016 standards, show that the best resistance is obtained for the 24-hour regime. Macro
and microscopic photographic images show differences between the erosions produced
on the surfaces, as a result of changes in structure and mechanical properties, created
by the maintaining times at the aging temperature and which are consistent with the
values of the reference parameters that characterize the erosion resistance by
cavitation.
70
RESEARCH ON THE IMPROVEMENT OF THE PHYSICAL AND
MECHANICAL CHARACTERISTICS OF STEELS FOR CONICAL
GEARING THROUGH NITROCARBURATION
G MIHUȚ1, M ARDELEAN2
1 Politehnica Timișoara University, Timișoara, România, gabriela.mihut@fih.upt.ro
2 Politehnica Timișoara University, Timișoara, România, marius.ardelean@fih.upt.ro
Abstract
The automotive industry is one of the most important consumers of materials and
especially of metallic materials. Competition in this domain, technical progress and
vehicle exigencies require knowledge of materials properties, and processing
technologies to ensure exploitation requirements, reliability, and aesthetic
requirements, with minimal costs.
This work is part of the modern trends of superficial surface improvement, mainly
used in the automotive industry and beyond. A nitrocarburation study is presented on
the conical gears that make up the car's differential, as well as the optimization of the
nitrocarburation technology.
The paper describes the subcritical and cementation annealing process as the
primary thermal treatment to which conical gears are subjected, as well as the
objectives of the nitrocarburisation, the materials used for this purpose, ending with
defects that can occur after the nitrocarburisation, as well as the properties obtained
after nitrocarburation.
71
EXPERIMENTAL MODELING OF ABRASIVE WATER-JET
CUTTING PROCESSES OF KEVLAR FIBER-REINFORCED
POLYMER COMPOSITES
D. GUBENCU1, C. LAZĂR1
1 Politehnica University of Timișoara, Timișoara, Romania, dinu.gubencu@upt.ro
1 Politehnica University of Timișoara, Timișoara, Romania, lazar_crystyan@yahoo.com
Abstract
In recent decades, the use of composite materials has spread widely in a variety of
industries, from consumer goods to aeronautics and automotive. This trend is mainly
explained by the functional properties of these materials, such as specific strength or
specific stiffness, which make them suitable for structural applications.
Kevlar fiber-reinforced polymer composites are difficult to process using
conventional methods, so non-traditional ones, like abrasive water jet machining,
became an alternative. This process has some advantages, such as the ability to cut
complicated shape parts of different sizes and thicknesses, with high precision.
However, the selection of operating parameters to provide a complete database,
tailored to carry out efficient and effective processes, remains a challenge.
Due to the complexity of the phenomena in the workspace, the analytical modeling
of the process is difficult and has limited validity by the simplified hypotheses
formulated previously. On the contrary, the models developed following empirical
research have proved their importance in industrial practice, leading to the estimation
of processing results, with high confidence levels.
Therefore, the experimental study was performed by applying the design of
experiments methods, to test the influence and to model the action of process
parameters on the material removal rate of abrasive water jet cutting. The research also
focused on the precision characteristics of the cut parts. Finally, the response surfaces
and contour plots were represented, useful for identifying the sets of the process
parameters that provide the required values for the objective functions investigated.
72
CHANGES IN THE MECHANICAL AND DIELECTRICAL
PROPERTIES OF SOME DIELECTRIC ELASTOMERS
A SOROCEANU
Institute of Macromolecular Chemistry “Petru Poni”, Iasi, Romania, lazar.alina@icmpp.ro
Abstract
Silicone-based dielectric elastomer polymers are sensitive polymeric materials with
the qualities needed for actuation and energy harvesting: high energy density, quick
response times, low Young's modulus, and a high breaking strain value. Furthermore,
silicone-based materials benefit from chemical and structural stability throughout a
wide range of environmental and technical conditions, including temperature, humidity,
and the electrical frequency of the applied current.
This presentation focuses on changes in dielectrical and mechanical properties
for dielectric elastomers obtained by reaction between polydimethylsiloxane polymers,
having different molecular weights, and Schiff-base metal complexes obtained by
condensation reaction between 1,3-bis(aminopropyl)tetramethyl disiloxane and 3,5-di-
bromo-2-hydroxybenzaldehyde. All of the findings show how a silicone polymer's
molecular weight affects mechanical and electrical properties, and they can aid in the
selection of silicones with the best molecular weight for specific applications based on
the desired combination of mechanical strain, dielectric constant, strength and
conductivity, and water vapor sorption. The fillers employed are clearly defined because
they contain an organosiloxane chain in a metal complex structure that ensures silicone
matrix empathy.
Acknowledgments: This work was supported by a grant of the Ministry of National
Education, CNCS UEFISCDI, project number PN-III-P1-1.1-PD-2021-0687 (Contract
33/2022).
73
ORGANIC-INORGANIC POLYMERIC SILOXANES FILLED WITH
SCHIFF-BASE METAL COMPLEXES
A SOROCEANU
Institute of Macromolecular Chemistry “Petru Poni”, Iasi, Romania, e-mail: lazar.alina@icmpp.ro
Abstract
Organic-inorganic polymeric siloxanes containing siloxane units have many
important characteristics of great interest to scientific researchers. They are recognized
for their good low-temperature flexibility and high permeability to gases and vapors,
having highly elastic behavior, but with low values of dielectric constant. By
incorporating into this polymer of various fillers we can obtain large dielectric constant
values.
Three composite dielectric elastomers with improved dielectric characteristics,
synthesized with three metal complexes of the azomethinic ligand generated by
condensation reaction between 1,3-bis(aminopropyl)tetramethyl disiloxane and 3,5-di-
bromo-2-hydroxybenzaldehyde, are the subject of the research.. The presence in the
structure of the tetramethyl disiloxane unit assignor a good compatibility whit the
siloxane matrix, while the presence of the metal changes the dielectric properties of
compounds. The obtained material composites were investigated by SEM, EDX, Stress-
strain, dielectric and mechanical measurements to estimate if these dielectric
elastomers films can be used in electronic devices. The use of metal complexes with
siloxane ligands to generate silicone polymeric composites is advantageous. Al the
obtained results demonstrated that the breaking strain and the dielectric properties can
be enhanced for samples that contain metal complexes compared to the siloxane
reference sample.
Acknowledgments: This work was supported by a grant of the Ministry of National
Education, CNCS UEFISCDI, project number PN-III-P1-1.1-PD-2021-0687 (Contract
33/2022).
74
LOW COST SYNTHESIS OF HYDROXYAPATITE USING A
RENEWABLE MARINE SOURCE OF CALCIUM
RADU BANICA1, ALEXANDRA IOANA BUCUR2, RAUL ALIN BUCUR3, CRISTINA MOSOARCA4,
MIHAI-COSMIN PASCARIU5, ZOLTAN SZABADAI6
1 National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara,
Romania, radu.banica@yahoo.com
2 National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara,
Romania, alexandra.i.bucur@gmail.com
3 National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara,
Romania, raul_alin_bucur@yahoo.com
4 National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara,
Romania, mosoarca.c@gmail.com
5 National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara,
Romania, mihai.cosmin.pascariu@gmail.com
6 National Institute for Research and Development in Electrochemistry and Condensed Matter, Timisoara,
Romania, szabadai@umft.ro
Abstract
Hydroxyapatite was deposited on the surface of marine exoskeletons, which served
as a substrate and also provided the calcium required in the synthesis. The reaction took
place in closed glass tubes, using reaction times between 4 and 112 hours and at a
temperature of only 90 degrees Celsius. X-ray diffraction and FTIR spectra were used to
confirm the structure of the obtained products. To increase the confidence of
hydroxyapatite’s identification, the sample obtained in 112 hours of reaction time was
calcined at 200 and 350 degrees Celsius to improve its crystallinity. A higher temperature
was not applied to avoid the conversion of exoskeletons’ aragonite into calcite. As
expected, the higher crystallinity improved the reflection intensities in the XRD
spectrum. Additionally, the sample that was produced in 16 hours was subjected to a
special FTIR analysis which implied using a variable temperature stage for heating the
sample in the 23-200 degrees Celsius temperature domain during infrared data
acquisition. The degree to which the phosphate ions were consumed during this lower
temperature synthesis was determined using a dedicated phosphate
spectrophotometer, and the results indicate a nucleation process taking place in the first
4 hours.
75
PLANT MEDIATED GREEN SYNTHESIS OF SILVER
NANOPARTICLES: TUSSILAGO FARFARA VS. HELICHRYSUM
ARENARIUM VS. ARTEMISIA ABSINTHIUM
SORESCU ANA ALEXANDRA1, SUICA BUNGHEZ IOANA RALUCA2, SENIN RALUCA3, STOICA
RUSANDICA4, GANCIAROV