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    Tytuł:
    Wykorzystanie metody CFD do obliczania natężenia przepływu medium w zaworach przelewowych sekcji obudowy zmechanizowanej
    The use of the CFD method to calculate the fluid dynamics in by-pass valves of power supports
    Autorzy:
    Janota, M.
    Władzielczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/187271.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
    Tematy:
    sekcja obudowy zmechanizowanej
    metoda CFD
    natężenie przepływu
    power support
    CFD method
    fluid dynamics
    Opis:
    W artykule przedstawiono możliwości i sposób obliczania przepływu medium przez zawory przelewowe stosowane w układzie hydraulicznym sekcji obudowy zmechanizowanej. Dla przykładowego zaworu DN10/ø4,5 zostały wykonane obliczenia natężenia przepływu medium za pomocą programu AUTODESK SIMULATION CFD 2013. Wyniki tych obliczeń porównano z rezultatami obliczeń uzyskanych drogą analityczną. Pozwoliło to na wyciągnięcie wniosków dotyczących dokładności obu metod obliczania wartości natężeń przepływu medium przez zawory przelewowe.
    The article features the possibilities and method to calculate the dynamics of fluids passing through by-pass valves used in a hydraulic system of power supports. For a sample DN10/ø4,5 valve the dynamics of the passing fluid was calculated with the use of the AUTODESK SIMULATION CFD 2013 program. The results were compared with the results of calculations made with the use of an analytical method. This allowed to draw some conclusions about the accuracy of both methods.
    Źródło:
    Mechanizacja i Automatyzacja Górnictwa; 2014, R. 52, nr 5, 5; 49-55
    0208-7448
    Pojawia się w:
    Mechanizacja i Automatyzacja Górnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Learning Search Algorithms: An Educational View
    Autorzy:
    Janota, M.
    Šimák, V.
    Hrbček, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/116502.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Search Algorithm
    Learning Search Algorithms
    educational view
    Artificial Intelligence Method
    Search Method
    Labyrinth
    Dijkstra algorithm
    Opis:
    Artificial intelligence methods find their practical usage in many applications including maritime industry. The paper concentrates on the methods of uninformed and informed search, potentially usable in solving of complex problems based on the state space representation. The problem of introducing the search algorithms to newcomers has its technical and psychological dimensions. The authors show how it is possible to cope with both of them through design and use of specialized authoring systems. A typical example of searching a path through the maze is used to demonstrate how to test, observe and compare properties of various search strategies. Performance of search methods is evaluated based on the common criteria.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8 no. 4; 565-570
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Two Model Coupling Methods for Joint Identication
    Autorzy:
    Susen, J.
    Sulitka, M.
    Sindler, J.
    Janota, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/99775.pdf
    Data publikacji:
    2015
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tool
    mutlibody model
    component coupling
    harmonic analysis
    Opis:
    An experimental identification of joint dynamic properties requires accurate models of the joined bodies and an appropriate model coupling method. The bodies to be coupled can be described by their mass, stiffness and damping matrices (M, K, C) or by receptance matrices. Each approach has its advantages and disadvantages. The receptance matrix method requires a high number of measurements. However the measured data can be used directly and no model identification is needed. The experimental identification of the M, K, C matrices feasible for creating precise coupled models is difficult. Therefore, an approach based on a verified FE model can be employed. The two methods of model identification and coupling are discussed using a case study of two bolted beams. Several ways of the receptance matrices measurement simplification and their influence on the accuracy of the results are studied. The effect of noise, measured FRF peak accuracy and data filtering on the resulting coupled receptance matrix is studied as well. The results obtained by the receptance matrix method are compared to the results obtained by the method of coupling the verified FE models. It has been found that the method based on coupling the verified M, K, C matrices proves to be a more reliable approach, which will allow a more precise joint dynamic model identification in the next step.
    Źródło:
    Journal of Machine Engineering; 2015, 15, 1; 58-70
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of fibre composites in a spindle ram design
    Autorzy:
    Kulisek, V.
    Janota, M.
    Ruzicka, M.
    Vrba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/99939.pdf
    Data publikacji:
    2013
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    carbon fibre reinforced plastics
    finite element analysis
    experimental modal analysis
    Opis:
    When compared to steel or cast iron, carbon fibre composites offer excellent tensile and bending stiffness together with significantly smaller density. Research at the Research centre of Manufacturing Technologies in Prague has been aimed at the application of composite materials in structural parts design. Case studies on spindle rams were performed focusing on the design of experimental composite spindle rams and their benchmarking with reference steel components. The cross-section of both parts was 350x350mm and the length was 1200mm. The first design was made as a thick-walled composite body with a minimal amount of steel. The goal was to achieve static stiffness comparable to a reference steel component of the same size. The second design was manufactured as a hybrid structure composed of fibre composites with cork layers and bonded steel reinforcements. The goal was to improve damping of the structural parts in comparison with the steel components. Results of stiffness and modal properties were obtained from experiments and also using FEA. Experimentally obtained damping ratios of composite and reference steel rams were compared with and without the effect of connection interfaces on damping.
    Źródło:
    Journal of Machine Engineering; 2013, 13, 1; 7-23
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emotional and habitual overeating and dietary restrictions in the eating habits of girls and boys
    Autorzy:
    Janota, B.
    Czapla, M.
    Wlazlo, M.
    Szczepanska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087282.pdf
    Data publikacji:
    2021
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    eating habits
    eating disorders
    dietary restrictions
    adolescents
    Opis:
    Background. Eating habits are mainly shaped at the first stages of human life. Incorrect eating habits in young individuals may in the future lead to eating disorders and predispose to abnormal body weight. Objective. The aim of the study was to investigate eating habits among adolescents and verify whether there are any differences in eating habits between girls and boys. Material and methods. The study was conducted among 337 post-primary school students, including 126 girls and 211 boys. A standardised questionnaire "My eating habits" was used as a research tool. Results. Secret snacking was slightly more common among girls (27.78%) than boys (24.17%). It was also girls who mostly admitted that other people comment on their diet, as indicated by 33.33% of girls and 18.96% of boys. Girls are also more likely to be dissatisfied with their body weight (41.27% vs. 27.49%) and to occasionally avoid eating despite feeling hungry (42.06% vs. 27.01%) compared to boys. Conclusions. The eating habits of young people are mostly varied. There are differences in the dietary habits of girls and boys; girls are more likely than boys to overeat under the influence of emotions and to apply dietary restrictions to themselves. In order to promote healthy eating habits and support the mental well-being of young people, it is recommended to provide nutritional education and to implement psychological support for those in need.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2020, 71, 4; 405-411
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Eating behaviours, the frequency of consumption of selected food products, and selected elements of lifestyle among young dancers
    Autorzy:
    Szczepanska, E.
    Janota, B.
    Wlazlo, M.
    Czapla, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087078.pdf
    Data publikacji:
    2021
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Tematy:
    lifestyle
    nutrition
    dancers
    Opis:
    Background. Proper nutrition and balanced physical activity have a beneficial effect on the growth and development of young athletes, supporting their endurance and health, which is particularly important in the period of adolescence. Objective. Aim of this study was to assess eating behaviours, frequency of consumption of some food products and selected elements of lifestyle among young dancers, as well as to compare the age of the dancers and the assessed behavior. Material and methods. The study included 198 dancers aged 10-15 years. An originally developed questionnaire was used as a research tool. Results. The largest group of dancers (43%) spent on training up to 2 hours per week. The recommended 4-5 meals/day were consumed by 61.1% of dancers, with 87.4% of respondents having breakfast on a daily basis. The recommendations on the daily intake of several portions of fruit and vegetables were followed by 49% and 36.9% of dancers, respectively. It is observed, that the consumption rates of sweets increased, while the consumption rates of fruit decreased with dancers’ age. The consumption rates of packed lunch and afternoon snack increased, whereas the consumption rates of dinner decreased with an increasing number of hours spent training. Conclusions. Eating behaviours and the frequency of consumption of food products by young dancers can be described as varied. Their diet is characterised by regular consumption of meals and a correct frequency of consumption of most food products, including high intake of fruit and vegetables, yoghurt and kefir, as well as low consumption of fast food products. The selected elements of dancers’ lifestyle, such as sleep time and physical activity, are mostly correct.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2021, 72, 1; 67-76
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of formulas for processing of measured points representing road surface deformations
    Autorzy:
    Halgas, J.
    Hrubos, M.
    Pirnik, R.
    Janota, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/393361.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    laser
    skaner
    wizualizacja
    model 3D
    visualization
    3D model
    scanner
    Opis:
    The paper describes an initial approach adopted by the authors to create a system usable to monitor the road surface deformations in time and to model them in the 3D environment. To obtain measured data a 2D laser scanner is used to measure a distance of the real environment points. The main part of the paper deals with the derivation of formulas used by a measurement unit to calculate the point coordinates. The formulas result from and reflex a method of 3D measurement using an accelerometer and a gyroscope. The practical experiments have confirmed the ability of the measurement unit to scan the road deformation and the surrounding environment.
    Źródło:
    Archives of Transport System Telematics; 2012, 5, 1; 7-10
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Consumption of selected groups of food products by medical and non-medical students during the COVID-19 pandemic
    Autorzy:
    Szczepańska, E.
    Janota, B.
    Mąkosza, K.
    Zięba, N.
    Wlazło, M.
    Czapla, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/28765609.pdf
    Data publikacji:
    2022
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Opis:
    Background. A properly balanced diet should provide multiple valuable nutrients necessary for the proper functioning of the body through the proper frequency of consuming food products that are their source. This is particularly important during the pandemic when there is a need to support the immune system. Objective. The aim of the study was to assess the frequency of consumption of selected groups of food products and to determine whether this frequency differs among medical and non-medical students in the period before and during the COVID-19 pandemic. Material and methods. The study was conducted among 435 Polish and Turkish students using an original questionnaire. The proper study was preceded by a pilot study in 40 participants.The Wilcoxon test was used to assess the differences in the frequency of consumption of selected groups of products among medical and non-medical students both during and before the pandemic. A value of p<0.05 was considered statistically significant. Results. Significant differences were observed in the frequency of consumption of: sweets (p=0.02 among medical students), salty snacks (p=0.03 among both groups of students), fast food products (p=0.00 among medical and p=0.01 among non-medical students) and energy drinks (p=0.02 among medical and p=0.00 among non-medical student) in the analysed periods of time before and during the COVID-19 pandemic. Conclusions. The study showed that during the pandemic, the frequency of food products consumption in the study groups of students from medical and non-medical faculties is mostly satisfactory. There were significant differences in the frequency of consumption of sweets, salty snacks, fast food products and energy drinks in both groups of students.
    Wstęp. Odpowiednio zbilansowana dieta powinna dostarczać organizmowi wielu cennych i niezbędnych do prawidłowego funkcjonowania organizmu składników odżywczych, poprzez właściwą częstość spożycia produktów spożywczych będących ich źródłem. Jest to szczególnie ważne w trakcie pandemii ze względu na możliwość wspierania odporności. Cel. Celem pracy była ocena częstości spożycia wybranych grup produktów spożywczych i stwierdzenie czy istnieją różnice w częstości spożycia wśród studentów kierunków medycznych i niemedycznych, w okresie przed i podczas trwania pandemii COVID-19. Materiał i metody. Badanie zostało przeprowadzone wśród 435 studentów narodowości polskiej i tureckiej za pomocą autorskiego kwestionariusza ankiety. Badanie właściwe zostało poprzedzone badaniem pilotażowym, którym objęto 40 osób. Do oceny różnic w częstości spożycia wybranych grup produktów wśród studentów kierunków medycznych i niemedycznych zarówno w trakcie pandemii, jak i przed nią zastosowano test Wilcoxona. Za istotne statystycznie uznano wyniki gdzie poziom istotności p<0.05. Wyniki. W analizowanych okresach czasu przed i w trakcie pandemii COVID-19 istotne różnice zaobserwowano w częstości spożycia: słodyczy (p=0,02 wśród studentów kierunków medycznych), słonych przekąsek (p=0.03 wśród obu grup studentów), produktów typu fast food (p=0,00 wśród studentów kierunków medycznych i p=0.01 wśród niemedycznych) oraz napojów energetycznych (p=0,02 wśród studentów medycznych i p=0.00 wśród studentów niemedycznych). Wnioski. Badania wykazały, że w czasie pandemii częstość spożycia produktów spożywczych w badanych grupach studentów zarówno kierunków medycznych, jak i niemedycznych jest w większości zadowalająca. W obu grupach studentów występowały istotne różnice w częstości spożycia słodyczy, słonych przekąsek, produktów typu fast food oraz napojów energetycznych.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2022, 73, 2; 173-181
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutritional behaviours and lifestyle before and during COVID-19 pandemic: ased on data from Polish and Turkish surveys
    Autorzy:
    Wlazło, M.
    Zięba, N.
    Janota, B.
    Czapla, M.
    Mąkosza, K.
    Janion, K.
    Szczepańska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/28765161.pdf
    Data publikacji:
    2023
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Opis:
    Background. Students are a group particularly high risk of adverse effects from such restrictions introduced within counter transmission the SARS-CoV-2 pandemic. Fear felt of contracting the disease and social isolation can lead to consuming excessive amounts of energy with food, resulting in weight gain and eating disorders. Objective. The aim of the study was analysed selected lifestyle aspects of Polish and Turkish students before and during the COVID-19 pandemic and to determine the existence of differences between the lifestyles of these individuals during the two periods. Material and methods. The study was conducted at the turn of 2020-2021 among 435 students, including 331 Polish and 104 Turkish students. The research instrument was an original questionnaire created in a Google Forms, consisting of metric and a proper part regarding lifestyle before and during the pandemic. Prior to the actual study, in order to verify whether the research tool is understandable, a pilot study was conducted, which included 40 individuals. The Wilcoxon test was used to examine the differences between the lifestyle of students before and during the pandemic. A value of p<0.05 was considered statistically significant. Results. Both before and during the pandemic, most Polish students ate 4–5 meals daily (52.9% and 47.7%, respectively), while most Turkish students ate 3 meals (47.1% and 38.5%, respectively). There were statistically significant differences in: duration of sleep (p=0.001), way of spending one’s leisure time (p=0.001) and type of physical activity (p=0.001) among the Polish and Turkish students before and during the pandemic. Conclusions. The results of this study showed changes in the lifestyle of both Polish and Turkish students during the pandemic compared to the pre-pandemic period. This indicates the need to develop interventions to prevent harmful behaviour and their health consequences in the future.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2023, 74, 3; 283-294
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rehabilitation robot prototypes developed by the ITAM Zabrze
    System sterowania rodziny robotów rehabilitacyjnych
    Autorzy:
    Michnik, A.
    Brandt, J.
    Szczurek, Z.
    Bachorz, M.
    Paszenda, Z.
    Michnik, R.
    Jurkojć, J.
    Rycerski, W.
    Janota, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/139671.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rehabilitation
    PNF
    prioprioceptiv neuromuscular facilitation
    motion capture
    robot
    force sensors
    rehabilitacja
    prioprioceptywne nerwowo-mięśniowe torowanie
    opanowanie ruchu
    czujniki siły
    Opis:
    Limb physical movements disability is the result of illnesses or serious injuries, impaired execution of daily activities and limitations or even inability to perform working activity. Restoration of fitness in such cases is possible through rehabilitation that requires arduous repetition of appropriate exercises with participation of an experienced physiotherapist. Exercises using the robot to repeat movements would speed up the process of rehabilitation. The paper presents the concept of rehabilitation robot control system realizing a specified purpose.
    Niepełnosprawność ruchowa kończyn powstała w wyniku przebytych chorób lub doznanych urazów, upośledza wykonywanie czynności codziennych i ogranicza a czasem uniemożliwia aktywność zawodową. Przywracanie sprawności w takich przypadkach polega między innymi na przeprowadzeniu rehabilitacji wymagającej żmudnego powtarzania odpowiednich ćwiczeń przy udziale doświadczonego fizjoterapeuty. Ćwiczenia z zastosowaniem robota do powtarzania ruchów rehabilitacyjnych pozwoliłyby ułatwić proces rehabilitacji. Praca przedstawia koncepcje systemu sterowania robota rehabilitacyjnego realizującego wymieniony cel.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 3; 433-444
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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