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    Wyświetlanie 1-11 z 11
    Tytuł:
    Operating temperatures of the bearing system of grinder spindle
    Temperatury pracy układu łożysk wrzeciennika szlifierki
    Autorzy:
    Strzelecki, S.
    Socha, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/189910.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    teoria smarowania hydrodynamicznego
    łożyska ślizgowe
    temperatura filmu smarowego
    theory of hydrodynamic lubrication
    journal bearings
    oil film temperature
    Opis:
    The ground for the safe operation of multilobe journal bearings at proper oil film temperature is the full knowledge of bearing thermal performances particularly the oil film temperature distribution and its maximum value. This paper describes the theoretical and experimental investigation into the operating temperatures of pericycloid, 3-lobe journal bearings supporting the spindle of grinding machine. The oil film pressure, temperature and viscosity fields have been obtained by iterative solution of the Reynolds', energy and viscosity equations. Adiabatic, laminar oil film and the static equilibrium position of the journal were assumed. Experimental investigation consisted in the measurements of temperatures in the bearings.
    Wielopowierzchniowe łożyska ślizgowe [L. 1-3], stosowane są w lekko obciążonych, wysokoobrotowych maszynach wirnikowych. W praktyce stosowane są łożyska ślizgowe 3-powierzchniowe z perycykloidalnym zarysem panewki (łożysko "falowe" – "wave") [L. 2, 3]. Przykładem ich zastosowania jest układ łożyskowania wrzeciennika szlifierki lub łożyska satelitów przekładni planetarnej [L. 3]. W części teoretycznej wyznaczono rozkłady ciśnienia i temperatury w filmie smarowym 3-powierzchnowego łożyska z zarysem perycykloidalnym rozwiązując równania Reynoldsa, energii i lepkości środka smarowego. Obliczenia przeprowadzono metodą różnic skończonych [L. 2] dla przypadku adiabatycznego filmu. W doświadczalnej części badań pomierzono temperatury na powierzchniach roboczych 3-powierzchniowych łożysk z zarysem perycykloidalnym. Stanowisko badawcze skonstruowano na bazie rzeczywistego układu łożysk ślizgowych [L. 4]. Każde z łożysk ślizgowych wyposażono w trzy czujniki temperatury umieszczone w środkowej płaszczyźnie łożyska w odległości około 0,2 mm od powierzchni roboczej panewki. Pomierzone wartości temperatur porównano z wartościami wyznaczonym teoretycznie.
    Źródło:
    Tribologia; 2011, 2; 157-167
    0208-7774
    Pojawia się w:
    Tribologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of pad offset on the stability of Jeffcott rotor operating in tilting 4-pad journal bearings
    Autorzy:
    Strzelecki, S.
    Socha, Z.
    Towarek, Z.
    Zakrzewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/127935.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    tilting-pad journal bearings
    stability of rotor
    łożysko ślizgowe segmentowe
    stateczność rotoru
    Opis:
    Tilting-pad journal bearings are applied in high-speed rotor systems. Excellent stability properties allow obtaining the reliable, vibration free, operation of bearings and rotor. There is still need for better knowledge of such bearings static and dynamic characteristics. In case of tilting-pad journal bearings the stability can be evaluated by the system damping. The system damping gives the damping reserve of the bearings-rotor system and can be obtained by the solution of basic hydrodynamic and rotor motion equations. In this paper the hydrodynamic equations were solved by means of finite difference method. As result, the dynamic characteristics of bearings in form of stiffness and damping coefficients were obtained. These coefficients were the basis for the determination of the system damping.
    Źródło:
    Vibrations in Physical Systems; 2014, 26; 273-280
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena zwrotności autobusów z uwzględnieniem stanów przejściowych ruchu
    Rating maneuverability of buses with inclusion of transient states of vehicle motion
    Autorzy:
    Lozia, Z.
    Socha, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/314374.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    autobus
    zwrotność
    stany przejściowe ruchu
    city bus
    maneuverability
    transient states of vehicle
    motion
    Opis:
    W pracy oceniono zwrotność autobusów miejskich jedno- i dwuczłonowych, bez i z uwzględnieniem stanów przejściowych ruchu. W stosunku do cytowanych prac, rozszerzono zakres obliczeń o stany przejściowe ruchu pojazdów, związane z fazą narastania i spadku kąta obrotu kierownicy do wartości wybranych przez kierowcę. Dla autobusów przegubowych uwzględniono skutki zjawiska wleczenia drugiego członu pojazdu w fazie do osiągnięcia stanu ruchu całego zestawu po torach o stałych promieniach krzywizn. Na podstawie wykonanych obliczeń porównano najmniejsze szerokości pasa skrętu pojazdu o kąt 90°oraz powierzchnie obszarów zajmowanych przez autobus w trakcie tego manewru. Wskazano na istotny wpływ stanów przejściowych ruchu na wykorzystywane miary zwrotności pojazdu.
    The study rated maneuverability of one- and two-part buses. Authors took into account the transient states of vehicle motion. In relation to the cited works they extended the scope of the calculation of transient vehicle motion associated with the phase of rise and fall in steering angle to the value selected by the driver. For two-part buses (articulated) buses they took into account the dragging effects of the trailer during the vehicle motion phase before it achieves a state of motion of the whole set on tracks with fixed radii of curvature. On the basis of the calculations it was possible to calculate the smallest width of the lane when turning vehicle at an angle of 90 deg as well as the surface areas occupied by the bus during this maneuver. Authors indicated a significant effect of transient states of vehicle motion during turning maneuver.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 8; 311-315
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation of thin brass sheets under tension-compression cyclic loading
    Autorzy:
    Kowalewski, Z. L.
    Dietrich, L.
    Socha, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/281653.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    fixture
    large deformations
    tension-compression tests
    thin metal sheet
    Opis:
    Strength and durability of thin-walled structures are usually calculated with the use of computer simulations. To perform such simulations using Finite Element Method, characteristics of a material subjected to monotonic tension or compression and tension-compression cyclic loading are necessary. Experimental determination of such kind of characteristics is usually performed on specimens cut out from a metal or composite thin sheet. Problems associated with testing on flat specimens under large deformation are discussed in this paper. A new design of fixture proposed by the authors for this kind of testing is shortly described. The results of investigations carried out on brass using the new fixture for flat specimens testing are also presented.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 757-762
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probiotyki - efekty zdrowotne
    Probiotics - health effects
    Autorzy:
    Nowak, A
    Slizewska, K.
    Libudzisz, Z.
    Socha, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/825971.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Technologów Żywności
    Tematy:
    probiotyki
    bezpieczenstwo stosowania probiotykow
    wlasciwosci zdrowotne
    walory zdrowotne
    zdrowie czlowieka
    choroby czlowieka
    choroby cywilizacyjne
    nowotwory
    otylosc
    alergie
    biegunki
    atopowe zapalenie skory
    zapalenie jelita grubego
    zespol jelita nadwrazliwego
    martwicze zapalenie jelit
    leczenie
    spozycie zywnosci
    Opis:
    W opracowaniu omówiono korzystne działanie probiotyków na zdrowie człowieka, a szczególnie ich rolę w ograniczaniu ryzyka chorób cywilizacyjnych, takich jak nowotwory, otyłość, alergie. Oddzielny rozdział poświęcono bezpieczeństwu stosowania (spożywania) produktów probiotycznych.
    Beneficial effects of probiotics on human health were discussed in this paper, and, in particular, their role in reducing risks of civilization diseases, such as: tumours, obesity, allergies. A separate chapter was devoted to the safety aspects of using (consuming) probiotic products.
    Źródło:
    Żywność Nauka Technologia Jakość; 2010, 17, 4; 20-36
    1425-6959
    Pojawia się w:
    Żywność Nauka Technologia Jakość
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differences in evaluation methods of trunk sway using different MoCap systems
    Autorzy:
    Kutilek, P.
    Socha, V.
    Cakrt, O.
    Svoboda, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/306317.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    trunk
    postural stability
    camera system
    orientation tracker
    convex hull
    confidence ellipse
    pitch versus roll
    tułów
    stabilność
    powłoka wypukła
    Opis:
    The position of the trunk can be negatively influenced by many diseases. Several methods can be used for identifying defects in balance and coordination as a result of pathology of the musculoskeletal or nervous system. The aim of this article is to examine the relationship between the three methods used for analysis of trunk sway and compare two fundamentally different MoCap systems. We used a camera system and a 3DOF orientation tracker placed on subject’s trunk, and measured inclination (roll) and flexion (pitch) during quiet stance. Ten healthy participants in the study were measured with eyes open and closed. The pitch versus roll plots of trunk were formed, and the area of the convex hull, area of confidence ellipse and total length of the trajectory of the pitch versus roll plot were calculated. The statistical analysis was performed and strong correlation between the area of the convex hull and area of the confidence ellipse was found. Also, the results show moderate correlation between the area of the confidence ellipse and total length of the trace, and moderate correlation between the area of the convex hull and total length of the trace. In general, the different MoCap systems show different areas and lengths but lead to the same conclusions. Statistical analysis of the participants with eyes open and eye closed did not show significant difference in the areas and total lengths of the pitch versus roll plots.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 2; 85-94
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ konkurencji na przyrost grubości drzew w wyżynnych lasach mieszanych o złożonej budowie
    Effect of competition on the diameter growth of trees in mixed upland forests with complex structure
    Autorzy:
    Śmigielski, A.
    Socha, J.
    Maciejewski, Z.
    Pach, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989022.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Roztoczanski Park Narodowy
    drzewostany naturalne
    drzewostany mieszane
    drzewa lesne
    grab
    buk
    jodla
    przyrost drzew
    przyrost grubosci
    wskazniki konkurencyjnosci
    competition indices
    natural stands
    roztocze national park
    Opis:
    The aim of this study was to assess the effect of competition on diameter growth of European beech (Fagus sylvatica L.), silver fir (Abies alba Mill.) and European hornbeam (Carpinus betulus L.) in forests with complex structure. For each tree we calculated set of 20 competition indexes in 4 variants for determining the scale of the competitors influence. The use of such a set of indices, allowed to describe accurately the competition between trees in the specific conditions for the particular tree species. Given species belong to the group of shade−tolerant trees. The species composition of the tree stands and their structure are the results of long−lasting natural processes, which is different than in the majority of Polish forests. The empirical material collected in the years 1993 and 2003 in four sample plots of 0.5 ha each located in natural stands of the Roztocze National Park in south−eastern Poland. The relationships between the competition and the growth were analysed using generalized additive models. This method allows to extend of the standard linear model, by taking into account non−linear function of each variable. One of the option of quantifying competition processes is the use of competition indices. The competition situation of an individual tree was described using distance−independ and distance−depend indices. Each of analysed species reacts differently on competition. Among the three analyzed species, the best competition index CI15 explained 48.3% of the variation diameter growth of European beech (tab. 2). The competition index CI3 explained only 26.1% of the variation diameter growth of European hornbeam (tab. 2). It turned out to be the worst result for the described species. The competition index CI14 explained 31.1% of the variation diameter growth of silver fir (tab. 2). Additional use of DBH in the models, increased values of the coefficient of determination, and extended the possibilities to use the developed models.
    Źródło:
    Sylwan; 2017, 161, 05; 365-378
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A preliminary study of the utilization of a low resolution ECG signal from handheld ECG monitor
    Autorzy:
    Kostorz, I.
    Kowalski, W.
    Ludwig, Z.
    Zając, J.
    Piasecki, A.
    Socha, M.
    Górka, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/332853.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    ECG signal analysis
    low resolution signals
    handheld monitor
    telemedicine
    analiza sygnału EKG
    sygnały o niskiej rozdzielczości
    monitor przenośny
    telemedycyna
    Opis:
    The paper presents the preliminary study of the utilization of a low resolution ECG signal analysis. The analysis was performed on the signals obtained from a hand-held ECG monitor usually used in primary health care. The aim. The main aim of the study was a registration of series of data by volunteers within couple of months and determination of signal quality and main ECG parameters as follows: Q, R, S waves, QRS duration as well as the end of PQ and the beginning of ST segment. Additionally, the heart rate variability was determined. Materials and methods. The data was registered by 12 volunteers aged from 35 to 55. The ECG tests were carried out for 7 months. The sample rate of the signal was 100 Hz. To determine the ECG parameters the signal processing and statistical methods was used. Results. The sensitivity of the following ECG parameters were: R wave detection - 99,2 %, Q wave detection - 99,1 %, S wave detection - 99,0 %, QRS duration - 99,2 % respectively.
    Źródło:
    Journal of Medical Informatics & Technologies; 2015, 24; 191-198
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concentration of magnesium in the serum and the ability status of patients with relapsing-remitting multiple sclerosis
    Autorzy:
    Karpińska, E.
    Socha, K.
    Soroczyńska, J.
    Kochanowicz, J.
    Jakoniuk, M.
    Mariak, Z.
    Borawska, M. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/961427.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Multiple sclerosis (MS) is the most common autoimmune disease affecting the central nervous system, characterized by the presence of scattered foci of demyelination in the brain and spinal cord. Magnesium (Mg) has a significant influence on the nervous system and the immune system. The aim of this study was to evaluate the influence of the concentration of Mg in the serum on the ability status of patients with MS. The study group consisted of 101 adults with diagnosed relapsing remitting MS. All participants were investigated on the Expanded Disability Status Scale. The control group included 41 people. The concentration of Mg in the serum was determined by the flame atomic absorption spectrometry method. The patients completed a survey and a 24-hour dietary interview. In patients with MS, the percentage of respondents with normal magnesium content was significantly lower than in the control group (p < 0.05). The study proved that patients with normal Mg serum concentration levels were in better clinical condition, particularly with respect to the function of the pyramidal tract (p = 0.007) and sphincters (p = 0.002), than patients with inadequate levels of Mg in the serum. External factors such as gender, smoking, immunomodulating medications or dietary supplements of Mg were found to have no effect on the concentration of Mg in the serum of MS patients. The results of our study suggest that an abnormal concentration of Mg in the serum of MS patients should be recognized and corrected, as this may improve the health status of people with MS.
    Źródło:
    Journal of Elementology; 2017, 22, 2
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concentration of magnesium in the serum and the ability status of patients with relapsing-remitting multiple sclerosis
    Autorzy:
    Karpińska, E.
    Socha, K.
    Sroczyńska, J.
    Kochanowicz, J.
    Jakoniuk, M.
    Mariak, Z.
    Borawska, M.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189829.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    multiple sclerosis
    magnesium
    EDSS
    environmental factors
    diet
    Opis:
    Multiple sclerosis (MS) is the most common autoimmune disease affecting the central nervous system, characterized by the presence of scattered foci of demyelination in the brain and spinal cord. Magnesium (Mg) has a significant influence on the nervous system and the immune system. The aim of this study was to evaluate the influence of the concentration of Mg in the serum on the ability status of patients with MS. The study group consisted of 101 adults with diagnosed relapsing remitting MS. All participants were investigated on the Expanded Disability Status Scale. The control group included 41 people. The concentration of Mg in the serum was determined by the flame atomic absorption spectrometry method. The patients completed a survey and a 24-hour dietary interview. In patients with MS, the percentage of respondents with normal magnesium content was significantly lower than in the control group (p < 0.05). The study proved that patients with normal Mg serum concentration levels were in better clinical condition, particularly with respect to the function of the pyramidal tract (p = 0.007) and sphincters (p = 0.002), than patients with inadequate levels of Mg in the serum. External factors such as gender, smoking, immunomodulating medications or dietary supplements of Mg were found to have no effect on the concentration of Mg in the serum of MS patients. The results of our study suggest that an abnormal concentration of Mg in the serum of MS patients should be recognized and corrected, as this may improve the health status of people with MS.
    Źródło:
    Journal of Elementology; 2017, 22, 2
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studying of Perovskite Nanoparticles in PMMA Matrix Used as Light Converter for Silicon Solar Cell
    Autorzy:
    Lipiński, M.
    Socha, R. P.
    Kędra, A.
    Gawlińska, K.
    Kulesza-Matlak, G.
    Major, Ł.
    Drabczyk, K.
    Łaba, K.
    Starowicz, Z.
    Gwóźdź, K.
    Góral, A.
    Popko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/356850.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    perovskite nanoparticles
    light converters
    solar cells
    solar energy materials
    Opis:
    The nanoparticles of CH3NH3PbBr3 hybrid perovskites were synthesized. These perovskite nanoparticles we embedded in polymethyl methacrylate (PMMA) in order to obtain the composite, which we used as light converter for silicon solar cells. It was shown that the composite emit the light with the intensity maximum at about 527 nm when exited by a short wavelength (300÷450 nm) of light. The silicon solar cells were used to examine the effect of down-conversion (DC) process by perovskite nanoparticles embedded in PMMA. For experiments, two groups of monocrystalline silicon solar cells were used. The first one included the solar cells without surface texturization and antireflection coating. The second one included the commercial cells with surface texturization and antireflection coating. In every series of the cells one part of the cells were covered by composite (CH3NH3PbBr3 in PMMA) layer and second part of cells by pure PMMA for comparison. It was shown that External Quantum Efficiency EQE of the photovoltaic cells covered by composite (CH3NH3PbBr3 in PMMA) layer was improved in both group of the cells but unfortunately the Internal Quantum Efficiency was reduced. This reduction was caused by high absorption of the short wavelength light and reabsorption of the luminescence light. Therefore, the CH3NH3PbBr3 perovskite nanoparticles embedded in PMMA matrix were unable to increase silicon solar cell efficiency in the tested systems.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1733-1739
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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