Jarosław Frączek

Jarosław Frączek
University of Agriculture in Krakow | UR · Department of Mechanical Engineering and Agrophysics

About

47
Publications
15,451
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256
Citations
Citations since 2017
21 Research Items
223 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050

Publications

Publications (47)
Article
The article presents the problems of measuring the static friction force of granular materials of plant origin. Measurements as such do not have clearly defined procedures. This leads to a situation in which it is very difficult to compare the results obtained by different researchers. The tests were performed on a linear tribometer. The authors de...
Article
Full-text available
The motion of a solid particle introduced into a stream of fluid is a crucial problem in the contexts of pneumatic transport and the purification and separation of non-uniform mixtures. However, the complexity of the underlying equations of motion enforces the creation of semi-empirical models. Therefore, analysis of particle motion in a pneumatic...
Article
Full-text available
In Poland the use of solid biomass obtained from intentional plantations of energy plants is increasing. This biomass is most often processed into solid fuels. There are growing indications that renewable energy sources, in particular biomass production, will continue to develop, so the better we know the raw material, the more effectively we will...
Article
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Increasing production of waste has compelled the development of modern technologies for waste management. Certain fractions of municipal solid wastes are not suitable for recycling and must be utilised in other ways. Materials such as refuse-derived fuel (RDF) fractions are used as fuel in cement or CHP (combined heat and power) plants. The low bul...
Article
The article shows a direct relationship between the maximum frictional force Fst (static friction) and the mean frictional force Fkin (kinetic friction). The tests were carried out for three plant granular materials (peas, maize, triticale). The modified Amontons-Coulomb model of friction was proposed for the Fst and Fkin description. The additiona...
Article
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Nowadays it is necessary to define actual global research trends in disciplines in order to determine the major research topics, discoveries and global scientific networks. The goal of the work was to determine the main topics and research trends in agricultural engineering. For this caser he method of modified bibliometric analysis was applied. Su...
Conference Paper
Full-text available
Solid biofuels can be defined as processed and unprocessed biomass. By definition it can be divided into: natural fuels (as obtained) and synthetic fuels (after mechanical and chemical treatment). Raw materials for the production of solid biofuels may include: wood, stalk plants, peat, sewage sludge and grains of cereals. These raw materials can be...
Article
The article examines the influence of several factors (load, moisture, velocity) on the value of the friction force. The research was conducted on three different granular materials of biological origin (peas, maize, triticale). In addition, attention was given to the geometrical surface structure of grains on contact with the structural material....
Article
Full-text available
The paper presents the results of research aimed at determining the influence of the composition of the fertilizer mixtures and the compaction pressure on the specific density and density index of fertilizer granules. Investigated mixtures were prepared from fly ash from power plant fuelled by biomass and digestate from biogas plant. The urea, sulf...
Article
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An experimental study was performed to determine the drying characteristics of an oversized fraction of RDF alternative fuel using a laboratory scale hot air dryer at a variety air temperatures and a constant air velocity. For this research the industrial RDF was derived from a Regional Municipal Waste Treatment Facility near the city of Kraków, Po...
Article
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Paper presents a concept of the mobile line for the production of granulated fertilizer from digestates and ash mixtures. The main assumption of the designed line is its mobility which allows line work in the place of production of digestate. The premise for developing such model of line was the fact that the transport of highly hydrated digestate,...
Article
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Paper presents design process of the prototype line, dedicated for production of fertilizer pellets from digestate-ash mixture. For enrichment of the nutritional characteristics of the final product additives were also used, like urea, elemental sulphur or phosphorite, and special fungal strains from Trichoderma spieces. During this process raw mat...
Article
Internal friction in granular plant materials is a very complex phenomenon. This is due to a vast number of factors that determine the behaviour of these materials. This article looks at exploring the impact of porosity, the repose angle, and moisture on the value of the internal friction angle and cohesion. Statistical analysis showed that the inf...
Article
The issues relating to the description of friction with regard to plant granular materials are fairly complicated due to a variety of factors determining the process. Considering each factor in isolation is insufficient and offers a limited insight into the phenomenon of friction. Therefore, the paper presents the research results concerning the in...
Article
Full-text available
The comprehensive use of available domestic energy resources, mainly coal and lignite, is the basis for the development of Poland’s economy and energy security due to the country’s large resource base. The implementation of clean coal technologies (CCT) is a necessary condition for maintaining coal’s leading position in Poland. Coal gasification te...
Article
The issues concerning porosity of granular materials, especially plant materials, are considered very important matters in respect of their transport, storage, precise dosing, and tribological properties. The classic method of measuring porosity requires specialized equipment and takes time, thus often being of little use in dynamic production proc...
Article
The results of studies on external friction concerning granular plant materials that include, among others, grains, seeds of various plants, and powdered plant material, have been applied to the design of machines and devices for transport, sorting, cleaning, and blending. A separate and equally important matter is the storage of these materials in...
Article
Full-text available
The impact of biomass addition to the RDF oversize fraction on quality parameters obtained from this blend of briquettes produced under semi-industrial conditions was analysed. For the purposes related to the experiment four RDF mixtures with fragmented biomass of common willow Salix viminalis L., differing only with percentage participation of bas...
Article
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Technology of processing of agricultural raw material and production residues from agri-food industry often requires their dewatering. Digestate is one of such materials i.e. the mass remaining after the bio-gasification process, which has great hydration (above 85%). The objective of the research was to know the impact of dewatering on the change...
Article
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The objective of the paper was to carry out a bibliometric quantitative analysis of publications concerning the application of artificial neural networks in the research area - agriculture and a bibliometric quantitative analysis and subject analysis with regard to agricultural engineering. A number of scientific publications devoted to the ANN fou...
Article
Full-text available
The paper presents the results of research, the objective of which was to determine the impact of particle size distribution and density of digestates and ash on density and tensile strength of granular fertilizer obtained from mixtures of these substrates. Particle size distribution, absolute density, envelope density and porosity of substrates we...
Article
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The article presents the procedure of determination of a structural form of an agricultural machine which encompasses methodological aspects of design related to the division of the basic objective function into member functions, multi-variant solutions and synthesis of astructural form (a virtual prototype of an agricultural machine). The suggeste...
Article
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The objective of the research was to create a model which defines the relation between a fundamental contact area of a seed and the pressure force, water content in a seed and its geometrical dimensions with application of artificial neural networks (SSN). Computer program Statistica Neural Networks v. 6.0. was used for formation of a neural model....
Article
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Wykorzystanie metod wielokryterialnej optymalizacji dyskretnej AHP w ocenie stopnia nasycenia infrastrukturalnego gmin w aspekcie rozwoju przedsiębiorczości WSTĘP Infrastruktura techniczna obszarów zurbanizowanych odgrywa istotna rolę w rozwoju społeczno-gospodarczym regionów. Stopień wyposażenia zainwestowania danego obszaru w infrastrukturę techn...
Article
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Transport zwierząt podlega szczególnym, wyraźnie sprecyzowanym, rygorystycznym regulacjom prawnym. Podstawowym i najbardziej istotnym celem tych regulacji jest zapewnienie dobrostanu zwierząt podczas transportu. Proces transportu można podzielić na następujące fazy: przygotowanie zwierząt do transportu, 6129 załadunek, przewóz, wyładunek. W każdej...
Article
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W pojazdach samochodowych stosowane są obecnie dwa warianty systemu TPMS (Tyre Pressure Monitoring System) - pośredni i bezpośredni. Oferowane są testery dedykowane dla warsztatów wulkanizacyjnych umożliwiające wykonanie operacji zarówno na czujnikach kół jak i na sterownikach elektronicznych układu a także przeprowadzenie wstępnej kontroli systemu...
Article
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W obecnej chwili większość producentów pojazdów systemy TPMS wprowadziło do grupy sygnałów informacyjnych. Powoduje to, że system pełni role kontrolno-informacyjną nie ingerując w parametry trakcji oraz silnika. W pojazdach samochodowych można spotkać dwa warianty systemu TPMS (Tyre Pressure Monitoring System) - pośredni i bezpośredni. W pracy prze...
Article
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W artykule przedstawione zostały definicje i klasyfikacja Systemów Wspomagania Decyzji, możliwości zastosowania SWD w obszarze logistyki oraz przykłady opracowanych systemów. Na podstawie analizy publikacji zamieszczonych w bazie Web of Science z lat 1994-2013 określono dynamikę badań nad Systemów Wspomagania Decyzji w logistyce. Przeanalizowano ob...
Article
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Biomasa zarówno nieprzetworzona jak i przetworzona stwarza określone trudności logistyczne. W głównej mierze wynikają one z rozmaitej podatności transportowej ładunku. W literaturze brak szerszej analizy dotycej tej podatności. Z tych względów w artykule podjęto próbę jej oceny tej podatności dla różnych rodzajów biopaliw stałych. Wiedza na ten tem...
Article
The relationships between the fineness of the selected energy crops and the force of external friction have been determined. The effects of the tests indicate a statistically significant effect of the shape aspect of shredded giant miscanthus and willow on the value of static and kinetic friction. The non-linear models proposed, which describe the...
Article
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Biomass is one of the oldest renewable energy sources. It is obtained mainly from agricultural production, forestry as waste or residue production. One of the plants that can be used for energetic crops is Cutleaf coneflower Rudbeckia laciniata L. It forms dense clumps. Currently, this plant is quite common in the wild, wet positions, located along...
Conference Paper
Full-text available
The work presents the optimization of the quality characteristics of dried apples and celery obtained during the convective drying process with forced air blow and microwave-convection due to the minimization of qualitative changes, such as colour, taste and smell. For this purpose, the study was performed, during which the samples of apples and ce...
Article
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Streszczenie. Celem pracy było określenie podstawowych właściwości topinamburu heli-anthus annuus L. odmiany Rubik istotnych w procesach produkcji biopaliw oraz określenie jego podatności na w procesach aglomeracji. Materiał do badań pozyskiwany był z Wydzia-łowej plantacji roślin energetycznych położonej przy Wydziale Inżynierii Produkcji i Ener-g...
Article
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Streszczenie. W pracy przedstawiono wyniki badań energochłonności procesu mielenia zrębków wierzby na młynie bijakowym firmy POR ECOMEC model C120. Określono na-kłady ponoszone na mielenie w zależności wielkości mielonych zrębków oraz od wielkości oczek w stosowanych sitach. Energochłonność procesu zobrazowano tzw. energią jednostko-wą E j m [Wh·kg...
Article
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Streszczenie. W pracy zaprezentowano opracowaną przez autorów metodę generowania trójwymiarowych modeli nasion roślin uprawnych. Metoda opiera się na wykonaniu serii przekrojów próbki, którą tworzy nasienie zatopione w żywicy Technovit 7100, z jednoczesną akwizycją obrazów tych przekrojów. Kolejny etap to komputerowa analiza obrazów prze-krojów pol...
Article
Full-text available
The paper presents an analysis of the potential possibility of using ash-leaved maple Acer negundo L. as an energy plant. The description of this species, originating from Northern and Central America and introduced in Poland in the 17th century, was carried out. It showed that the analysed species fulfils the basic requirements for energy plants....
Article
Full-text available
The study was undertaken to examine the immunogenic potential of pea protein of Polish variety Rodan and its trypsin hydrolysates differing in degree of hydrolysis. The physicochemical characteristic of pea protein extract and its hydrolysates, DH 2.0 and 5.0, were determined by SDS-PAGE electrophoresis, chromatofocusing, affinity chromatography, a...
Article
The paper presents a mathematical model of the greenhouse substratum heating process, which occurs when tubes are positioned in the substratum. The model includes the processes of transpiration, evaporation and infiltration. The mass of water consumed by roots of cultivated vegetables was calculated as a transpiration model, treated as a source fun...
Article
The phenomenon of internal friction plays a major role in the majority of processing procedures. Thus, it is imperative to determine the internal friction coefficient for products under processing. It is not a simple objective in case of biological materials for which application of classic friction definitions is rather limited. The studies presen...
Article
Full-text available
Streszczenie. Oceniono stanu i kierunki rozwoju wybranych elementów infrastruktury tech-nicznej w gminie Biecz oraz porównano je z oczekiwaniami mieszkańców. Stwierdzono, iż większość sołectw nie jest objęta siecią wodociągową i kanalizacyjną. Rozwój infrastruktury technicznej powinien więc nastąpić głównie w tym kierunku. Przeprowadzone badania wy...
Article
Full-text available
Streszczenie. Istotny wpływ na właściwości fizyczne, a w szczególności mechaniczne pę-dów, ma ich budowa anatomiczna. Na przekroju pędów wierzby wyróżnić można następujące elementy: kora, łyko, drewno oraz rdzeń. Właściwości fizyczne tych elementów różnią się, a tym samym mają różny wpływ na procesy technologiczne np. cięcia. Z tych względów ce-lem...

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