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1
Content available Computer analysis of electromotoric swivel walker movement
Varga J., Hajduk M., Świć A.
Applied Computer Science
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2016
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Vol. 12, no 4
88--95
EN
The first mechanical construction of swivel walker is from year 1963 and it was aimed for support movement of people with disabilities. This solution was very difficult and it was main reason for purpose of electromotoric module, which facilitates movement and reduce effort of people with disabilities. Therefore further research in this area are still provided. In this paper trajectory of swivel walker with electromotoric modules is described. To analyze the tilt and trajectory structure of the walker SolidWorks software was implemented.
2
Content available Optimization and design of four gripper pneumatical Rubik’s Cube solver
Hajduk M., Varga J., Durovsky F
Applied Computer Science
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2014
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Vol. 10, no 3
57--67
EN
Robotic Rubik’s solver is an excellent example of science popularizing mechatronic device, since it combines knowledge of several technological fields including computer vision techniques, advanced numerical algorithms and control of industrial pneumatic components with popula-rity of Rubik’s cube in one resulting device. First version of solver con-structed by our department was equipped only by 2 lower grippers, resul-ting in approximately four minutes for single cube solution. Proposed paper describes not only experience gained by development of upgraded 4 gripper version but includes statistical analysis of Thistlethwait’s 45 algorithm required for solving process optimization. Mechanical design, electronics, system overview, performance and limitations of upgraded 4 gripper version are explained in detail as well.
3
Content available Assessment of surface quality for chosen milling strategies when producing relief surfaces
Varga J., Stahovec J., Beno J., Vrabeľ M
Advances in Science and Technology. Research Journal
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2014
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Vol. 8, nr 22
37--41
EN
The paper deals with design and modeling of the relief surfaces that are produced in milling. Modeled and real surface quality is presented for the chosen fragments of the relief surfaces. Fragmentation of the relief surfaces has been made by the surface sampling. Milling strategies are compared with regard to surface formation. Surface quality was checked with regard to applied cutting conditions.
4
Content available Adhesive wear of selected tool steels used for injection moulds manufacturing
Greškovič F., Dulebová L., Spišák E., Duleba B., Varga J.
Tribologia
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2013
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nr 1
47--58
EN
The aim of this work is to test and select appropriate types of tool steel for the production of mould inserts for plastic forming. The contribution is focused on the adhesive wear of mould inserts used for forming PA6 plastics. The wear of five types of tool steels were evaluated by weight decrease before and after the experiment, while change of the friction coefficient of rubbing airs and change of the roughness. The mating components adhesive wear of tool steels was determined experimentally that has given the wear figures for injection moulds.
PL
Celem pracy było przetestowanie i wybór właściwej stali narzędziowej do wytwarzania form wtryskowych do elementów z tworzyw sztucznych. Publikacja jest zogniskowana na zużyciu adhezyjnym form stosowanych do formowania tworzywa PA6. Zużycie pięciu rodzajów stali narzędziowej zostało określone przez wyznaczenie spadku masy przed i po przeprowadzeniu testu, przy czym określono też współczynnik tarcia chropowatości. Zużycie adhezyjne stali narzędziowych zostało określone eksperymentalnie, co dało wartości zużycia dla form wtryskowych.
5
Content available Current and potential oncomarkers in diagnosing breast cancer
Bilecová-Rabajdová M., Urban P., Grešová A., Varga J., Gregová K., Stupák M., Mareková M.
Journal of Ecology and Health
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2012
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R. 16, nr 3
138-143
EN
Breast cancer is a very serious disease from both an economical and social point of view, because of its high incidence and mortality, as well as its prevalence. Genetic and epigenetic changes as well as the resultant deregulation of mechanisms that affect cellular processes are reflected in the final stage, like significant variability in phenotype. These changes have multiple factors in clinical, morphological but also molecular terms, and they greatly affect the possibility of accurate diagnosis of breast cancer in its early stages. Since no combination of clinical examination, mammography and ultrasonography together with CT and MRI can achieve 100% sensitivity, clinical practice is supported with diagnostic methods based on the monitoring of tumour markers with the emphasis on molecular markers. This review describes the most common molecular markers already used for earlier clinical diagnostics and also proposes new possible markers from the tumour vascular markers group. Any new oncomarkers to improve diagnostic sensitivity and specificity will be of great benefit, and in clinical practice, they may provide an opportunity for early diagnostic and therapeutic intervention, and subsequently better prognosis for the patient as well.
PL
Rak piersi jest bardzo poważną chorobą, zarówno z punktu widzenia ekonomicznego jak i społecznego, ze względu na dużą zachorowalność i umieralność, a także na zakres jego występowania. Zmiany genetyczne i epigenetyczne, jak również wynikająca z nich deregulacja mechanizmów, które wpływają na procesy komórkowe są odzwierciedlone w ostatnim stadium choroby, jak znaczna zmienność fenotypu. Zmiany te mają wiele przyczyn z punktu widzenia klinicznego, morfologicznego, ale również molekularnego oraz znacznie wpływają na możliwość dokładnego rozpoznania raka piersi w jego wczesnych fazach. Ponieważ żadna kombinacja badań klinicznych, mammografii i USG wraz z tomografią komputerową i obrazowaniem magnetyczno-rezonansowym nie może osiągnąć 100% czułości, praktyka kliniczna jest wspierana metodami diagnostycznymi opartymi na monitoringu markerów nowotworowych, ze szczególnym uwzględnieniem markerów molekularnych. Niniejsza recenzja opisuje najbardziej typowe markery molekularne wykorzystywane we wczesnej diagnostyce klinicznej, a także proponuje nowe potencjalne markery z grupy markerów nowotworowych TVMs . Wszelkie nowe markery nowotworowe poprawiające czułość i dokładność diagnostyki będą bardzo pomocne, a w praktyce klinicznej mogą pozwolić na wczesną diagnostykę i leczenie, co polepszy także rokowania pacjenta.
6
Content available remote The new trends in design moulds for plastic
Greskovic F., Dulebova L., Varga J.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2010
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z. 80 [274]
91-96
EN
The paper presents new trends and new materials used in the design of moulds for plastics processing. Application of CAD / CAM / CAE systems reduces the time of the design of forming tool. Tool materials produced by new technologies are compared with standard materials. Wear of tool materials were examined for plastics injection molding. Simulation of technology of plastic injection molding process was examined as a tool to improve the quality of plastic parts.
7
Content available remote The influence of radiation crosslinking on mechanical properties of plastics
Varga J., Greskovic F.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2010
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z. 81 [277]
115-120
EN
The presented article deals by the application area of radiation cross-linking of plastics, which follows after the processing (injection moulding, extrusion or blow moulding). The main objective of the presented article is investigation of influence irradiation dosage on mechanical properties of materials: PP filled by 15% of mineral filler - talc. Mechanical properties - tensile strength were examined in dependence on absorbed dose of the beta rays on various conditions and were compared with non-irradiated samples
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