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    Wyświetlanie 1-10 z 10
    Tytuł:
    Relationship of vertical jump test with anthropomethric parameters and body composition in university students – a gender variation
    Autorzy:
    Dalui, Rishna
    Singha Roy, Anindita
    Kalinski, Michael
    Bandyopadhyay, Amit
    Powiązania:
    https://bibliotekanauki.pl/articles/1055154.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    BMI
    LBM
    VJT
    body fat
    skinfold
    Opis:
    Vertical jump test (VJT) is one of the important determinants of physical fitness. VJT score in school going children of West Bengal, India has been reported. However, pertinent data in young sedentary Indian males and females are unavailable. Moreover, the relationship of VJT with anthropometric parameters and different components of body composition has not yet been explored in Indian context. Debatable findings have been reported regarding the impact of body composition on VJT score. The present study was aimed to evaluate the VJT score in young sedentary Indian university students and its relationship with anthropometric parameters and different components of body composition with special reference to gender variation. Healthy sedentary university students (males n=40 and females n=40) with similar socio-economic background and age group of 21–25 years were randomly sampled for the study from the post-graduate section of the University of Calcutta, Kolkata, India. VJT was evaluated by Sargent Jump Test, and body composition was determined by skinfold measurements. Body height, body mass, %Fat, Total Fat (TF), LBM and VJT score depicted significant (p<0.001) difference between male and female groups. The VJT scores obtained in the male and female groups were in the range of below average and poor, respectively. Physical parameters did not influence the VJT score in both genders. In the present study the VJT score exhibited significant (p<0.001) negative correlation with %fat, individual skinfold, sum of skinfolds, and TF. Hence, body fat content posed as a hindrance to achieve higher jumping height, especially in females, where the lean mass helped to achieve greater VJT score in males.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2014, 5, 1; 83-90
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effects of inclination angle and Prandtl number on the mixed convection in the inclined lid driven cavity using lattice Boltzmann method
    Analiza za pomocą siatki Boltzmanna wpływu kąta pochylenia oraz liczby Prandtla na mieszaną konwekcję w ukośnej szczelinie domkniętej ruchomą pokrywą
    Autorzy:
    Karimipour, A.
    Nezhad, A. H.
    D’Orazio, A.
    Shirani, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/280863.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    LBM
    inclination angle
    Prandtl number
    mixed convection
    Opis:
    The laminar mixed convection in a two-dimensional rectangular inclined cavity with moving top lid is investigated using the double population thermal lattice Boltzmann method (LBM) at different values of the Richardson number, inclination angle and the Prandtl number. In this problem, velocity components are changed by both buoyancy forces and the inclination angle of the cavity. Comparison of the present results with other available data show good agreement. As the results, the velocity and temperature profiles, the Nusselt number, streamlines and isotherms are presented and discussed. It is shown that the increase of Prandtl number enhances the heat transfer rate, especially at higher values of inclination angle and Richardson number. Moreover, the average Nusselt number at the upper limit of the considered range of the Richardson and Prandtl numbers variability increases by a factor of 9.
    W pracy zajęto się problemem mieszanej konwekcji laminarnej w dwuwymiarowej, prostokątnej i ukośnie usytuowanej szczelinie domkniętej od góry ruchomą pokrywą. W badaniach zastosowano metodę siatki termicznej Boltzmanna (LBM) podwójnej populacji, uwzględniając rożne wartości liczby Richardsona, kąta pochylenia szczeliny oraz liczby Prandtla. W rozważanym zagadnieniu, składowe prędkości zostały poddane zmianom indukowanym siłami wyporu oraz kątem pochylenia szczeliny. Porównanie otrzymanych wynikow analizy z dostępnymi w literaturze danymi wykazało dobrą zgodność. Rezultatem badań w pracy są także profile rozkładu prędkości i temperatury, liczba Nusselta, linie prądu oraz izotermy, które szczegółowo przedyskutowano. Pokazano, że wzrost liczby Prandtla zwiększa transfer ciepła, zwłaszcza dla wyższych wartości kąta pochylenia szczelin i liczby Richardsona. Co więcej, średnia liczba Nusselta przy górnych wartościach przyjętego zakresu zmienności liczb Richardsona i Prandtla wzrasta 9-krotnie.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 447-462
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nano-particles transport in a concentric annulus: a lattice Boltzmann approach
    Autorzy:
    Pourmirzaagha, H.
    Hassanzadeh, A. H.
    Abouei, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/280059.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    LBM
    nano-particles
    dispersion
    removal
    Brownian motion
    thermophoresis
    Opis:
    A combination of the lattice Boltzmann method and lagrangian Runge-Kutta procedure is used to study dispersion and removal of nano-particles in a concentric annulus. The effect of aspect ratio, Rayleigh number and particles diameter are examined on particles removal and their dispersion characteristics. Simulations are performed for the Rayleigh number ranges from 103 to 105 and aspect ratio of 2, 3 and 4. Higher aspect ratios have led to weaker recirculation strength. The finest particles move on stochastic path due to the effect of Brownian motion. The Brownian motion has a greater effect on the removal of nano-particles with respect to thermophoresis.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 683-695
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lattice Boltzmann simulation of natural convection flow around a horizontal cylinder located beneath an insulation plate
    Autorzy:
    Mehrizi, A. A.
    Farhadi, M.
    Afrouzi, H. H.
    Shayamehr, S.
    Lotfizadeh, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/949135.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    free convection
    isothermal cylinder
    Lattice Boltzmann method (LBM)
    Opis:
    In this paper, two-dimensional heat transfer solution of natural convection around an isothermal cylinder located beneath an insulation wall is studied. The effects of distance ratio of the cylinder to the wall as well as the impact of the dimensionless Rayleigh number in the flow and heat transfer are taken into account. Solving the flow equations for L/D ratio with values 0.5, 0.7, and 1.5 and the Rayleigh number ranging from 1000 to 40000 is carried out. The results are compared with the experimental data which present a good agreement. The results indicate that the effect of weakened natural convection flow in the cylinder commences when decreasing L/D ratio from the value 1.5 to 0.5 leading to a decline in heat transfer and the Nusselt number. This process occurs in all values of the Rayleigh number. For the ratio number greater than 1.5, the impact of adiabatic wall is neglected, and there is no significant influence on the natural convection flow. Increasing the angle from 0◦to180◦results in a fall in the Nusselt number which is as a consequence of growth in the distances of isothermal lines.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 729-739
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Second law analysis of mhd forced convective nanoliquid flow through a two-dimensional channel
    Autorzy:
    Miri, Rached
    Abbassi, Mohamed A.
    Ferhi, Mokhtar
    Djebali, Ridha
    Powiązania:
    https://bibliotekanauki.pl/articles/2204682.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    MHD
    LBM
    channel flow
    nanoliquids
    entropy generation
    Brownian motion
    Opis:
    The present study deals with fluid flow, heat transfer and entropy generation in a two-dimensional channel filled with Cu–water nanoliquid and containing a hot block. The nanoliquid flow is driven along the channel by a constant velocity and a cold temperature at the inlet, and the partially heated horizontal walls. The aim of this work is to study the influence of the most important parameters such as nanoparticle volume fraction (0%≤ϕ≤4%), nanoparticle diameter (5 nm≤dp≤55 nm), Reynolds number (50≤Re≤200), Hartmann number (0≤Ha≤90), magnetic field inclination angle (0≤γ≤π) and Brownian motion on the hydrodynamic and thermal characteristics and entropy generation. We used the lattice Boltzmann method (LBM: SRT-BGK model) to solve the continuity, momentum and energy equations. The obtained results show that the maximum value of the average Nusselt number is found for case (3) when the hot block is placed between the two hot walls. The minimum value is calculated for case (2) when the hot block is placed between the two insulated walls. The increase in Reynolds and Hartmann numbers enhances the heat transfer and the total entropy generation. In addition, the nanoparticle diameter increase reduces the heat transfer and the irreversibility, the impact of the magnetic field inclination angle on the heat transfer and the total entropy generation is investigated, and the Brownian motion enhances the heat transfer and the total entropy generation.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 4; 417--431
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CuO–water mhd mixed convection analysis and entropy generation minimization in double-lid–driven u-shaped enclosure with discrete heating
    Autorzy:
    Mliki, Bouchmel
    Miri, Rached
    Djebali, Ridha
    Abbassi, Mohamed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2204647.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    U-shaped enclosure
    MHD mixed convection
    nanoliquids
    double lid-driven cavity
    entropy generation
    LBM
    Opis:
    The present study explores magnetic nanoliquid mixed convection in a double lid–driven U-shaped enclosure with discrete heat-ing using the lattice Boltzmann method (LBM) numerical method. The nanoliquid thermal conductivity and viscosity are calculated using the Maxwell and Brinkman models respectively. Nanoliquid magnetohydrodynamics (MHD) and mixed convection are analyzed and entropy generation minimisation has been studied. The presented results for isotherms, stream isolines and entropy generation describe the interaction between the various physical phenomena inherent to the problem including the buoyancy, magnetic and shear forces. The operating parameters’ ranges are: Reynolds number (Re: 1–100), Hartman number (Ha: 0–80), magnetic field inclination (γ: 0°–90°), nanoparticles volume fraction (ϕ: 0–0.04) and inclination angle (α: 0°–90°). It was found that the and the total entropy generation augment by increasing Re, ϕ: and γ. conversely, an opposite effect was obtained by increasing Ha and α. The optimum magnetic field and cavity inclination angles to maximum heat transfer are γ = 90° and α = 0.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 1; 112--123
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extended free surface flow model based on the lattice Boltzmann approach
    Rozszerzony model przepływów z powierzchnią swobodną oparty na metodzie siatkowej Boltzmanna
    Autorzy:
    Szucki, M.
    Suchy, J. S.
    Żak, P.
    Lelito, J.
    Gracz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/264039.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    modelowanie komputerowe
    metoda siatkowa Boltzmanna
    LBM
    przepływy dwufazowe
    numerical modeling
    lattice Boltzmann method
    two-phase flows
    Opis:
    The aim of this work was to extend numerical model of mould filling phenomena previously presented in [3]. Authors described some techniques for modeling single phase and free surface flows. Method, called "piston model", for modeling influence of liquid flow on gas behavior inside the mould and also, effect of local gas pressure on movement of metal free surface, was shown. In last part of this work, results from presented model were compared with data from the commercial simulation environment FLOW-3D.
    Celem pracy było rozbudowanie numerycznego modelu procesu zalewania formy odlewniczej o możliwość określenia pola prędkości i lokalnego ciśnienia w podobszarze formy wypełnionym przez fazę gazową. Autorzy przedstawili pokrótce techniki, oparte na metodzie siatkowej Boltzmanna, pozwalające na modelowanie przepływów jednofazowych i przepływów z powierzchnią swobodną. Zaproponowano również rozwiązanie, nazwane w niniejszej pracy "modelem tłoka", umożliwiające zarówno modelowanie wpływu ruchu fazy ciekłej na charakter i kinetykę przepływów w fazie gazowej, jak i uwzględnienie oddziaływania lokalnego ciśnienia gazu na przemieszczanie się powierzchni swobodnej metalu. W końcowej części pracy skonfrontowano wyniki uzyskane przy wykorzystaniu zaproponowanego modelu z danymi otrzymanymi w komercyjnym programie symulacyjnym FLOW-3D.
    Źródło:
    Metallurgy and Foundry Engineering; 2010, 36, 2; 113-121
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of heterogeneous surfaces by ESD and LBM
    Autorzy:
    Radek, N.
    Pliszka, I.
    Antoszewski, B.
    Świderski, B.
    Pietraszek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/111850.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    heterogeneous surfaces
    electro-spark deposition
    ESD
    laser beam machining
    LBM
    texturing
    properties
    powierzchnia heterogeniczna
    obróbka wiązką laserową
    teksturowanie
    Opis:
    The paper is concerned with testing Cu-Mo coatings deposited over carbon steel C45 which were then eroded with a laser beam. The properties were assessed by analyzing the effects of laser eroded, texturing methodology and wear tests. The tests were conducted for Mo and Cu coatings (the anode) which were electro-spark deposited over the C45 steel substrate (the cathode) and melted with a laser beam. The coatings were deposited by means of an ELFA-541. The laser processing was performed with an Nd:YAG laser. The coatings after laser processing are still distinguished by very good performance properties which make them suitable for use in sliding friction pairs.
    Źródło:
    Production Engineering Archives; 2016, 13, 4; 44-48
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Precyzyjne cięcie laserem tlenku cyrkonu IV (ZrO2)
    Precision laser cutting of zirconium dioxide
    Autorzy:
    Nowak, A.
    Wyszyński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/339818.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Zarządzania Produkcją
    Tematy:
    obróbka laserowa
    LBM
    laser Nd
    YAG
    tlenek cyrkonu IV
    precyzyjna obróbka laserowa
    materiały trudnoobrabialne
    precision laser machining
    difficult-to-machine materials
    ZrO2
    Opis:
    Precision laser machining of a difficult to machine materials is a complex issue and requires the involvement of the wide knowledge and experience in the field of science materials and physical phenomena occurring in the within the interaction site of the laser beam with the material workpiece. Correct selection of the laser source and equipment system with appropriate instrumentation allows the processing of materials in an efficient and cost-effective way and also allows to fulfill the requirements for treatment of the materials on a micro scale. From the analysis of the results it can be concluded that the edges resulting from laser treatment carried grooves are sharp (samples 9, 10, 11), which predisposes the type of processing to perform the blades of the cutting tools. Depth obtained in these tests grooves (single-pass laser beam) may indicate a high performance cutting process of cutting teeth. In view of the aforementioned facts, it is expected to shorten the preparation time of the cutting blade, thereby reducing production costs. As a result, it is possible to increase the competitiveness of companies doing good quality tools made lower than the standard cost-effectively, and thus this type of solution has the potential of development for native Polish enterprises, so that they offer can become complementary to the tycoons on the Polish market aspect of the production of custom, dedicated ie. “tailor-made” tools. Based on the study it can be concluded that the use of DPSS Nd: YAG laser (λ = 532 nm), with appropriate selection of process parameters for precise and efficient laser shaping of difficult to cut materials, such as described in the work - zirconium dioxide. Further studies will aim to establish guidelines for the planning process precision laser cutting of other materials from the group of difficult ones, such as PCD, diamond, Al.2O3 (sapphire) or c-BN. This is particularly important from the point of view of the precise shape of cutting tools used widely in the aerospace, automotive and carpentry.
    Źródło:
    Zarządzanie Przedsiębiorstwem; 2017, 20, 2; 13-19
    1643-4773
    Pojawia się w:
    Zarządzanie Przedsiębiorstwem
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Granica laminarnego przepływu wody w obsypce żwirowej studni eksploatacyjnej
    The boundary of the laminar water flow in the filter pack of a pumping well
    Autorzy:
    Matyka, M.
    Mądrala, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075640.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    obsypka żwirowa
    pompy wodne
    przepływ w ośrodku porowatym
    matoda LBM
    numer uczestnictwa
    filter packs
    water wells
    pore-scale flow
    Lattice Boltzmann Method
    participation number
    Opis:
    Structural changes of aquifers, resulting from a higher velocity of water entering a screen, may occur in the zone around wells ’ screen. Well discharge rate equations assume a laminar flow and agreement with the Darcy s law. Thus, the admissible velocity of water entering the screen should not exceed a certain limit. In this research, the microstructure of water flow velocity in the well s filter pack was studied. We took a picture of the internal structure of the aquifer s pore media in an in situ undisturbed soil sample. Because of the lack of a clear definition of the characteristic length scale in the Reynolds number, we propose to use additionally n - a dimensionless value describing the distribution of kinetic energy in the system - as a criterion for changing the flow nature. We based the study on numerical simulations offluid flow in pore space. We used the Lattice-Boltzmann Method (LBM) to simulate water flow in the filtered zone. We find that in a real porous system of the filter pack with a porosity of n = 0.49, as opposed to highly porous material at n = 0.9, the values of n increase with the decreasing and increasing Reynolds number. The distribution of the velocity field in the analyzed sections also shows the formation ofprivileged waterflow paths and the formation ofvortex structures for high flow velocities.
    Źródło:
    Przegląd Geologiczny; 2017, 65, 11/2; 1334--1338
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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