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    Wyświetlanie 1-4 z 4
    Tytuł:
    Parametric studies and simulation of PSA process for oxygen production from air
    Autorzy:
    Beeyani, A.
    Singh, K.
    Vyas, R.
    Kumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779567.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    amplituda ciśnienia adsorpcji
    model matematyczny
    symulacja
    produkcji tlenu
    MATLAB
    Zeolit5A
    pressure swing adsorption
    mathematical model
    simulation
    oxygen production
    Zeolite 5A
    Opis:
    A numerical simulation and parametric studies for the separation of air using 5A zeolite for the production of oxygen are presented for a basic two bed pressure swing adsorption (PSA) process. The simulation is based on an in-house program 'PSASOL' developed in MATLABŽ. The transient process of PSA has been described by a set of partial differential equations, which were solved using a finite difference method. Simulation results have been validated with the experimental data from literature. Based on the simulation results, an optimal set of operational parameter values has been obtained for the PSA bed. The values of the optimal parameters, viz. adsorption pressure, cycle time, feed rate, and product rate have been found to be 2.5 atm, 150 s, 15 cm3/s, and 2.55 cm3/s, respectively. For the optimal conditions, purity of 95.45% and recovery of 77.3% have been achieved. It has also been found that a longer tubular unit with the length to diameter (L/D) ratio of 10.5 is advantageous. The estimated pressure drop across the bed has been found to be negligible. Power consumption and productivity have also been computed.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 2; 18-28
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Disparity of a Seat Cushion and Its Influence on Postural Control
    Autorzy:
    Nag, P.K.
    Nag, A.
    Vyas, H.
    Shah, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/89723.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    cushion
    foam
    cotton
    centre of pressure measurements
    postural control
    kontrola postawy ciała
    postawa ciała
    siedzenie
    kontrola równowagi
    Opis:
    Properties of supporting surfaces of a seat have an influence on postural control. Centre of pressure (COP) displacement parameters reflect both the balance controlling process and movements of the centre of a mass of entire body. The subjects of the study were 9 healthy men. A seat cushion was examined with a 2-force platform setup. Force exertion at a seat pan and feet and COP displacement at a seat pan were measured to analyse postural control. Analysis of variance determined the differences in postural control depending on a cushion type among the subjects. Significant differences in COP displacement parameters were in COP trajectory length, medio-lateral COP displacement and COP velocity. The results of the study showed that foam cushion ensures better postural control.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 4; 573-581
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Postural Stability of Sitting Women
    Autorzy:
    Nag, P. K.
    Vyas, H.
    Nag, A.
    Pal, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/90231.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    woman
    chair sitting
    postural stabilometry
    kobieta
    krzesło
    stabilność postawy
    Opis:
    The study examined the utility of stabilometric dimensions and explored whether the changes in sitting postures were manifested in functional measures of postural control. Eleven women participated in the study, which used 11 chair sitting postures: arms on laps or arms right angled; armrest at a height of 17, 20 and 23 cm; with or without backrest; slouch or straight back; legs right angled at knees or crossed legs. The backrest and armrest shifted 16.3% of body weight from a seat pan. The characteristics of stabilometric dimensions evaluated the influence of seat components and sitting behaviour on postural balance. The study attempted to evaluate stability and its application in human–seat interface design.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 4; 583-595
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on thermodynamic properties of Fe³⁺-substituted yttrium iron garnets
    Autorzy:
    Modi, K.
    Jha, P.
    Raval, P.
    Vasoya, N.
    Vyas, K.
    Meshiya, U.
    Gohil, R.
    Jadav, K.
    Gohil, N.
    Sharma, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1158494.pdf
    Data publikacji:
    2016-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    05.70.-a
    Opis:
    This paper presents the molar heat capacity at constant volume C_{V} and characteristic Debye temperature θ, determination for the garnet system, Y_{3-x}Fe_{5+x}O_{12}, x=0.0, 0.1, 0.3, and 0.5 at 300 K. The θ values determined from Waldron's approach and those calculated using ultrasonic mean sound velocity, V_{mo}, are in agreement. C_{V} values calculated from the Einstein theory are consistent with the reported one and theoretically expected values using the Dulong-Petit law, but Waldron's approach based on the Debye theory and the Debye T³ law fail to estimate consistent C_{V} values. The result has been discussed in the light of key physical differences between the two theories. The applicability of the Kieffer model for molar heat capacity at constant pressure, C_{p}, determination has been tested. Finally, an attempt has been made to estimate electronic contribution and the temperature at which the lattice contribution and electronic contribution to the molar heat capacity become comparable.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 3; 778-784
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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