Myzafere Limani

Myzafere Limani
Academy of Sciences and Arts of Kosovo · Natural sciences

Prof. Dr.

About

74
Publications
134,993
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122
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September 1978 - December 2013
University of Prishtina
Position
  • Head of Department of Electronics

Publications

Publications (74)
Article
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The degree, to which the concept of transformational analogy of electromagnetic field can be applied to other fields such as acoustics and optics, remains an open question. In this paper, the analogy between the acoustic and magnetic field is shown by the action of Lorentz's force. The Lorentz's force (the force acting on currents in a magnetic fie...
Article
Full-text available
The use of SPWM and SV-PWM Voltage Source Inverters are the common type of Variable Frequency Drive (VFD) for 3-phase induction motors in the industry. Even though the SPWM technique has an easier implementation, the SV-PWM has easier digital realization and better utilization of the DC link. Every 3-Phase PWM-Inverter that uses these two modulatio...
Article
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In this paper, we analyze the method of passive over/under voltage for protection and distribution of PV systems connected to the utility grid. The method in question is analyzed by non-detection area and based on the possibility of degradation of output power quality, which is a known weak point of this method. The analysis focuses on the worst ca...
Article
Full-text available
Choosing the appropriate control technique in Variable Speed Drive (VSD) is very important to avoid faults on the hoisting system of molten metal. This paper analyzes the sensitivity of the hoist system in crane applications from the three various control techniques of variable speed drives of induction motors: V/f open-loop control, V/f closed-loo...
Article
Full-text available
The objective of this paper is to research the impact of electrical and physical parameters that characterize the complementary MOSFET transistors (NMOS and PMOS transistors) in the CMOS inverter for static mode of operation. In addition to this, the paper also aims at exploring the directives that are to be followed during the design phase of the...
Preprint
The objective of this paper is to research the impact of electrical and physical parameters that characterize the complementary MOSFET transistors (NMOS and PMOS transistors) in the CMOS inverter for static mode of operation. In addition to this, the paper also aims at exploring the directives that are to be followed during the design phase of the...
Article
Full-text available
Nowadays, variable speed AC motors are widely used in industry and there are many speed adjustment techniques available. In the last decade there has been a trend towards the use of space vector PWM–IGBT inverters, due to easier digital realization and better utilization of the DC bus. Every power inverter produces a total harmonic distortion (THD)...
Article
Full-text available
The goal of this paper is to determine the influence of the main electrical and physical parameters that characterize MOSFET (the NMOS transistor), which control the device behaviour that depends on the selected parameter values. Furthermore, the paper provides directives that need to be followed during the design phase of MOSFET, which shall enabl...
Conference Paper
Full-text available
The relationship between information technology (IT) and science and engineering (S&E) can be seen from two points of view: IT as a target for S&E, which results carried out IT in changes in S&E; the influence of IT in the pipeline for S&R through the higher demand for human resources with technical skills and through the use of IT at all levels of...
Article
Full-text available
The aim of this paper is to show the influence of the threshold voltage and transconductance parameters that characterize the NMOS transistors on the behavior of NMOS inverters in static and switching conditions of operation, as well as set directive that should be followed during the design phase of NMOS inverters that enable designers to design N...
Conference Paper
Full-text available
Tensionet etike si pjesë e praktikës së përditshme të punës kërkimore shkencore shtjellohen nga dy aspekte: ballafaqimi i shkencëtarëve me problemet etike që paraqiten në punën e tyre kërkimore shkencore dhe mundësia e definimit të kornizave konceptuale të cilat duhet ndjekur që të mbrohet kodi etik në punën kërkimore shkencore.
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Drejtuesi njëfazor i gjysmëvalës është tipi më i thjeshtë, i cili zakonisht nuk përdoret në zbatime industriale, por ai është megjithate i përshtatshëm për kuptimin e parimit të punës së këtyre qarqeve. Diagrami i qarkut me ngarkesë rezistive është paraqitur në fig.3.1a. Gjatë gjysmëciklit pozitiv të tensionit hyrës, dioda D përcjell dhe tensio...
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6.1 HYRJE Tiristori zakonisht kyçet me aplikimin e sinjalit të gejtit. Kur tiristori është në modin përcjellës, rënia e tensionit në te është e vogël, në brez prej 0.25 deri 2 V, dhe kjo, gjatë analizës së qarqeve në këtë kapitull, nuk është përfillur. Tiristori njëherë i kyçyr i cili i ka përmbush kërkesat e daljes, zakonisht duhet të shkyçet....
Conference Paper
Full-text available
The objective of this paper is to show the influence of the parameters that characterize the NMOS transistors on the behavior of NMOS inverters in static operation mode, as well as set directive that should be followed during the design phase of NMOS inverters that enable designers to design inverters with the best possible performance, depending o...
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ABSTRACT The grating structure as the most fundamental element of SAW (Surface Acoustic Wave) devices is discussed. The modeling based on the periodic modulation of basic properties is included. Diffraction characteristics of general planar (slab) gratings and surface-relief (corrugated) gratings are presented. An exact formulation of grating diffr...
Conference Paper
Full-text available
In this paper are presented and analyzed techniques for modulating a single phase VSI using new perspectives of the fundamental principles of PWM which are dependent of inverter topology and modulation strategy. For analyze are taken two cases which affect the harmonic performance of PWM systems. The modulation schemes aim to create trains of switc...
Article
Full-text available
Qëllimi i këtij punimit është të tregojë ndikimin e parametrave që i karakterizojnë transistorët NMOS në sjelljen e invertorit NMOS për kushte statike të punës, si dhe të përcaktojë direktivat që duhen të ndiqen gjatë fazës së projektimit të invertorit NMOS të cilat i mundësojnë projektuesit të projektojë invertor me veçori sa më të mira, varësisht...
Article
Full-text available
Në ketë punim është analizuar ndikimi i indeksit të modulimit amplitudor në praninë e harmonikëve të tensionit në dalje dhe të rrymës së ngarkesës te invertorët sinus - PWM trefazorë të tensionit. Invertori i tensionit i prezantuar këtu është i fuqisë së mesme dhe si elemente ndërprerës shfrytëzon IGBT-të, sepse kombinojmë përparësitë e transistorë...
Article
Full-text available
Analysis of the dynamic sharing currents at turn-on process in power PWM inverter system with switching Metal-Oxide-Semiconductor-Field-Effect-Transistors (MOSFET's) connected in parallel is presented. The inverter circuit presented in this paper is low power inverter which can be used as a charger too. The influence of the diferent rise time drivi...
Conference Paper
Full-text available
Analysis of the dynamic sharing currents at turn-on process in power PWM inverter system with switching Metal-Oxide-Semiconductor-Field-Effect-Transistors (MOSFETs) connected on parallel is presented. The inverter circuit presented in this paper is low power inverter which can be used as a charger too. The influence of the parameters mismatch betwe...
Article
Full-text available
The pseudo-NMOS logic can be used in special applications to perform special logic function. The pseudo-NMOS logic is based on designing pseudo-NMOS inverter which functions as a digital switch. During the design phase of pseudo-NMOS inverters and logic gates based on MOS technologies, it is necessary to take into consideration many parameters whic...
Article
Full-text available
During the design phase of different logic gates based on MOS technologies, it is necessary to take into consideration many parameters which characterise MOS transistors. One of the parameters which characterizes all types of MOSFET transistors is the threshold voltage that has impact in static and dynamic performances of the different logic gates....
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In this paper is presented a novel approach for fulfilling the data security criteria in a Student Lifecycle Management System at the University of Prishtina. The four main criteria of data security such as: privacy, authentication, integrity and non-repudiation are fulfilled through carefully selected security policies. Student data privacy is ach...
Article
Full-text available
In this paper is presented a novel approach for fulfilling the data security criteria in a Student Lifecycle Management System at the University of Prishtina. The four main criteria of data security such as: privacy, authentication, integrity and non-repudiation are fulfilled through carefully selected security policies. Student data privacy is ach...
Conference Paper
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In this paper is presented a novel software solution for the implemention of a Student Management Information System at the University of Prishtina. The novelty of implemented solution is based on extending the subject name in X.509 digital certificates and using this certificate for securing student grades. The issued X.509 digital certificate is...
Conference Paper
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In this paper is analyzed three-phase VSI. A VSI used to supply a variable frequency voltage to a three phase AC motor in a variable speed application. A suitable Pulse Width Modulation strategy (Holtz, 1992) is employed to obtain the required output voltage in the inverter. In this paper used two strategies. Sine-triangle PWM, three phase referenc...
Conference Paper
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Ndikimi i PWM-së në komponentët harmonikë të tensionit në dalje të invertorëve push pull njëfazorë dhe në ndërprerësit MOSFET The influence of PWM in output voltage harmonics components in single phase push-pulls inverters and MOSFET switches Invertorët DC-AC japin tension dalës alternativ "sinusoidë e modifikuar" sepse ata e konvertojnë tensionin...
Article
Full-text available
The aim of this paper is to research the impact of physical parameters which characterize the MOSFET transistors structure on the threshold voltage values and its influence on critical voltage values which characterize digital circuits that contain the MOSFET transistors. The results obtained emphasize the impact of each single physical parameter o...
Book
Full-text available
The aim of this paper is to research the impact of physical parameters which characterize the MOSFET transistors structure on the threshold voltage value. The MOSFET threshold voltage value will have influence in behaviour of electronic device which contain MOSFET transistors. The results obtained emphasize the impact of each single physical parame...
Chapter
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Veshi i njeriut si marrës i zërit, njëkohësisht është edhe mjet i fuqishëm për pranimin e informatave. Kjo në esencë do të thotë se njeriu ka aftësi që të ndiej dhe ta dalloj një numër të madh të karakteristikave të zërit të cilat rrjedhin qoftë nga burimi, qoftë nga sistemi përcjellës, qoftë nga ambienti akustik në vendin e pranimit. Aftësi të til...
Chapter
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Në këtë kapitull do të analizohen karakteristikat themelore që janë të rëndësishme për kualitetitn e pranimit të zërave domethënëse për njeriun, dhe të cilat i shërbejnë për përcjelljen e informatave të dobishme (të dëshiruara). Sinjalet më të rëndësishme akustike janë të folurit dhe muzika, por njeriu në jetën e përditshme prodhon, pra edhe pranon...
Chapter
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Analiza përhapjes së valëve akustike në hapësirë të mbyllur është më e komplikuar kur kemi hapësirë të kufizuar, dimensionet e së cilës nuk janë të vogla në krahasim me gjatësin valore. Është e qartë se atëherë valët akustike përhapen në të gjitha drejtimet, shumëherë reflektohen nga muret kufizuese të hapësirës, - gjatë kësaj zakonisht humbet një...
Conference Paper
Full-text available
Në invertorët njëfazorë, si elemente ndërprerëse përdoren zakonisht MOSFET-ët e fuqisë (HEXFET-ët). Gjatë ndërrimit të gjendjeve nga regjimi alternativ (AC) në regjim të invertimit (DC) shfaqen vonesa kohore (në milisekonda) gjatë komutimit të MOSFET-ave, të cilat ndikojnë në vonesat totale kohore gjatë tranzicioneve AC-DC dhe anasjelltas. Si pasoj...
Conference Paper
Full-text available
The aim of this paper is to research the impact of physical parameters which characterize the MOSFET transistors structure on the threshold voltage value. It is also analysed the role of substrate (the body effect) on the threshold voltage. The MOSFET threshold voltage value will have influence in the dynamic and static work regime (mode) of device...
Article
Full-text available
Advanced development of technological processes influenced a wide use of MOSFET transistors in design of integrated digital circuits with high density packages (VLSI). However, in MOSFET transistors parasitic capacitances are present, which will influence on speed of operation in the circuits and dynamic dissipation power. The aim of this paper is...
Conference Paper
Full-text available
The aim of this paper is to calculate the MOSFET parasitic capacitances, and then based on the results obtained we can further see the impact of MOSFET physical parameters on these parasitic capacitances. These capacitances have a direct impact in the speed of operation of MOSFET circuits. Therefore, in order to increase the speed of operation, it...
Book
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Me eksploatimin e potencialit të kodit digjital për urëzimin e mediumeve të komunikimit, multimedia paraqet një hapësirë që ofron mundësi të reja dhe të pakufizuara. Ajo ofron mundësi për paraqitje dhe analizë të materialeve të cilat është e pamundur të inkorporohen në tekstet dhe monografitë tradicionale dhe ato të shpërndahen në audiencën e gjerë...
Conference Paper
Full-text available
Abstract: This paper analyzes the influence of load impedance nonlinearity in weighted THD of three-level inverter. While block modulation is still used to produce a variable frequency AC supply in some applications, it has largely been supplanted by more sophisticated modulation strategies such as pulse width modulation, which have the major advan...
Conference Paper
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Përmbledhje: VDMOSFET-i është MOSFET me difuzion të dyfishtë, me strukturë vertikale. Kur MOSFET-i i fuqisë është në gjendje ON atëherë do paraqitet një sjellje rezistive ndërmjet Drejnit dhe Sorsit RDson , e cila është shuma e rezistencave elementare të pjesëve përbërëse të tij. Në ketë rezistencë kontribuon: rezistenca e Sorsit (RS), rezistenca e...
Article
Full-text available
In this paper, SAW propagation in surface-relief (corrugated) gratings is rigorously analyzed using multi-wave coupled-wave theory. Using this method of solution, it is possible to calculate the diffraction efficiencies of surface-relief gratings to an arbitrary level of accuracy. The analysis contains no restrictions with respect to grating profil...
Article
Full-text available
The grating structure as the most fundamental element of SAW (Surface Acoustic Wave) devices is discussed. The modeling based on the periodic modulation of basic properties is included. Diffraction characteristics of general planar (slab) gratings and surface-relief (corrugated) gratings are presented. An exact formulation of grating diffraction pr...
Article
Full-text available
In this work are reviewed physical parameters according to which in idealized form is determined the threshold voltage of NMOS transistors with enhancement (long) chanel. The threshold voltage is a controlled value according to the technological process. It is reviewed the dependence of the threshold voltage from the thickness of oxide layer and bi...
Article
Full-text available
Qëllimi i këtij punimi është që të analizohen parametrat fizikë, sipas të cilëve përcaktohet vlera e tensionit të pragut të përçueshmërisë së transistorëve NMOS. Meqenëse tensioni i pragut është i përcaktuar sipas procesit teknologjik të ndërtimit të tyre, andaj, duke ndryshuar parametrat fizikë sipas mundësive të proceseve teknologjike mund të arr...
Conference Paper
Full-text available
The grating structure as the most fundamental element of SAW (Surface Acoustic Wave) devices is discussed. The modeling based on the periodic modulation of basic properties is included. Diffraction characteristics of general planar (slab) gratings and surface-relief (corrugated) gratings are presented. An exact formulation of grating diffraction pr...
Book
Full-text available
Libri "Elektronika energjetike" është paraparë si tekst për lëndën “Elektronika Energjetike” për studentët e energjetikës dhe të elektronikës. Ky mund të shfrytëzohet edhe si libër referent për inxhinierët nga praktika, të cilët merren me projektimin dhe zbatimet e elektronikës energjetike. Parakusht për përcjelljen e shtjellimit në këtë lëmi duhet...