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Wyświetlanie 16-30 z 54
Tytuł:
Transient free convective radiative flow between vertical parallel plates heated/cooled asymmetrically with heat generation and slip condition
Autorzy:
Gaur, P. K.
Sharma, R. P.
Jha, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/264930.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
wytwarzanie ciepła
promieniowanie cieplne
MHD
slip flow
heat generation
thermal radiation
Opis:
Investigation of an MHD convective flow of viscous, incompressible and electrically conducting fluid through a porous medium bounded by two infinite vertical parallel porous plates is carried out. Forchheimer-Brinkman extended Darcy model is assumed to simulate momentum transfer within the porous medium. A magnetic field of uniform strength is applied normal to the plates. The analytical results are evaluated numerically and the presented graphically to discuss in detail the effects of different parameter entering into the problem.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 365-384
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of thermal radiation and heat generation on hydromagnetic flow of nanofluid over an exponentially stretching sheet in a porous medium with viscous dissipation
Autorzy:
Murugesan, Thiagarajan
Kumar, M. Dinesh
Powiązania:
https://bibliotekanauki.pl/articles/1059429.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
MHD
Nanofluid
exponentially stretching sheet
heat generation
porous medium
thermal radiation
viscous dissipation
Opis:
This paper studies, the impacts of heat generation on MHD flow of radiative nanofluid over an exponentially stretching sheet in a porous medium with viscous dissipation are numerically analyzed. Two sorts of nanofluids, generated by solid nanoparticles with water such as alumina-water nanofluid and silver-water nanofluid were investigated. With the use of similarity transformations, to obtain a system of nonlinear ordinary differential equations. The resulting boundary value problem is solved numerically using the Nachtsheim-Swigert shooting technique scheme together with fourth-order Runge-Kutta integration method. Numerical results are obtained for the velocity, temperature distribution and concentration profiles for selected values of the governing physical parameters of combined magnetic interaction and porosity parameter, heat generation parameter, viscous dissipation parameter, thermal radiation parameter, solid volume fraction parameter, chemical reaction parameter and Lewis number are discussed. Quantities of engineering interest such as Skin friction coefficient, Nusselt number, and Sherwood number are also obtained numerically and are tabulated.
Źródło:
World Scientific News; 2019, 128, 2; 130-147
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Internal Heat Generation on the Thermal Stability of a Porous Fin
Autorzy:
Sobamowo, M. G.
Jayesimi, L. O.
Waheed, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/1031875.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Differential Transformation Method
Porous Fin
Temperature-Dependent Internal Heat Generation
Thermal analysis
Thermal performance
Opis:
In this study, the effects of internal heat generation on thermal stability of porous fin is theoretical investigated using differential transform method. The parametric studies reveal increase in the internal heat generation leads to increase in the value or the range of the thermal stability of the fin. The internal heat generation can be used to control the thermal instability in the fin. Also, as the porosity parameter increase, the rate of heat transfer from the base of the fin and consequently improve the efficiency of the fin increase. However, a high value or an excessive internal heat generation results in an undesirable situation where some of the heat energy cannot escape to the sink and instead ends up flowing into the prime surface and the fin tends to store heat rather than dissipating it. This scenario defeats the prime purpose of the cooling fin. Therefore, the operational parameters must be carefully selected to ensure that the fin retains its primary purpose of removing heat from the primary surface.
Źródło:
World Scientific News; 2020, 149; 110-127
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Similarity solutions on mixed convection heat transfer from a horizontal surface saturated in a porous medium with internal heat generation
Autorzy:
Ferdows, M.
Liu, D.
Powiązania:
https://bibliotekanauki.pl/articles/265076.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
mixed convection
horizontal porous surface
internal heat generation
konwekcja mieszana
powierzchnia porowata
wytwarzanie ciepła
Opis:
The aim of this work is to study the mixed convection boundary layer flow from a horizontal surface embedded in a porous medium with exponential decaying internal heat generation (IHG). Boundary layer equations are reduced to two ordinary differential equations for the dimensionless stream function and temperature with two parameters: ε, the mixed convection parameter, and λ, the exponent of x. This problem is numerically solved with a system of parameters using built-in codes in Maple. The influences of these parameters on velocity and temperature profiles, and the Nusselt number, are thoroughly compared and discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 253-258
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of thermoelastic transient contact interaction for binary bearing taking into account convection
Моделирование термоупругого нестационарного контактного взаимодействия в бинарном подшипнике скольжения с учетом конвективного теплообмена
Autorzy:
Kolesnikov, I.
Danilchenko, S.
Kolosova, E.
Chebakov, M.
Lyapin, A.
Powiązania:
https://bibliotekanauki.pl/articles/374611.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
bearing
friction
heat generation
convective heat transfer
temperature
łożysko
tarcie
generowanie ciepła
wymiana ciepła przez konwekcję
temperatura
Opis:
Serviceability of metal-polymeric "dry-friction" sliding bearings depends on many parameters, including the rotational speed, friction coefficient, thermal and mechanical properties of the bearing system and, as a result, the value of contact temperature. The objective of this study is to develop a computational model for the metallic-polymer bearing, determination on the basis of this model temperature distribution, equivalent and contact stresses for elements of the bearing arrangement and selection of the optimal parameters for the bearing system to achieve thermal balance. Static problem for the combined sliding bearing with the account of heat generation due to friction has been studied in [1]; the dynamic thermoelastic problem of the shaft rotation in a single and double layer bronze bearings were investigated in [2, 3].
Работоспособность полимерных подшипников скольжения «сухого трения» зависит от многих параметров, включающих в себя скорость вращения вала, коэффициент трения, термо-механические свойства элементов подшипниковой системы и, как следствие, величины результирующих контактных температур. Целью данного исследования является разработка расчётной модели работы бинарного подшипника скольжения «сухого трения» с полимерными цилиндрическими вставками, определения на ее основе распределения температур, эквивалентных и контактных напряжений в элементах подшипниковой системы и подбор оптимальных параметров подшипниковой системы, при которых достигается тепловой баланс. Статическая задача для комбинированного подшипника скольжения с учётом тепловыделения от трения была исследована в работе [1], динамическая термоупругая задача о вращении вала в однослойном подшипнике из бронзы была исследована в работе [2], двухслойного с антифрикционным покрытием в.
Źródło:
Transport Problems; 2016, 11, 4; 73-81
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady MHD mixed convection flow of a micropolar fluid over a vertical wedge
Autorzy:
Roy, N. C.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/264759.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
micropolar fluid
unsteady flow
radiation
heat generation
płyn mikropolarny
przepływ nieustalony
promieniowanie
wytwarzanie ciepła
Opis:
An analysis is presented to investigate the unsteady magnetohydrodynamic (MHD) mixed convection boundary-layer flow of a micropolar fluid over a vertical wedge in the presence of thermal radiation and heat generation or absorption. The free-stream velocity and surface temperature are assumed to be oscillating in magnitude but not in the direction of the oncoming flow velocity. The governing equations have been solved by two distinct methods, namely, the finite difference method for the entire frequency range, and the series solution for low frequency range and the asymptotic series expansion method for the high frequency range. Numerical solutions provide a good agreement with the series solutions. The amplitudes of skin friction and couple stress coefficients are found to be strongly dependent on the Richardson number and the vortex viscosity parameter. The Prandtl number, the conduction-radiation parameter, the surface temperature parameter and the pressure gradient parameter significantly affect the amplitudes of skin friction, couple stress and surface heat transfer rates. However, the amplitudes of skin friction coefficient are considerably affected by the magnetic field parameter, whereas the amplitudes of heat transfer rate are appreciably changed with the heat generation or absorption parameter. In addition, results are presented for the transient skin friction, couple stress and heat transfer rate with the variations of the Richardson number, the vortex viscosity parameter, the pressure gradient parameter and the magnetic field parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 363-391
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of non-uniform heat generation /absorption and radiation on hydromagnetic dissipative flow over a porous nonlinear stretching surface with heat and mass fluxes
Autorzy:
Anjali Devi, S. P.
Agneeshwari, M.
Powiązania:
https://bibliotekanauki.pl/articles/264962.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
strumień ciepła
strumień masy
absorpcja ciepła
MHD
heat flux
mass flux
non-uniform heat generation/absorption
Opis:
Forced convective heat and mass transfer flow of hydromagnetic, radiating and dissipative fluid over a porous nonlinear stretching sheet in the presence of non-uniform heat generation/absorption is investigated numerically. The system of nonlinear partial differential equations governing the physical problem is reduced to nonlinear ordinary differential equations by means of suitable similarity transformations and are solved numerically using Nachtsheim Swigert shooting iteration scheme together with fourth order Runge Kutta method. The effects of various physical parameters on velocity, temperature and concentration distributions are depicted graphically. The important findings of this study exhibited that the effect of non-uniform heat generation/absorption parameter and radiation parameter have significant role in controlling thermal boundary layer thickness and temperature. Numerical values of the skin friction coefficient, temperature and concentration at the wall are shown in a tabula form. A comparison is made with previously published data which results in good agreement.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 36-52
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanofluid motion past a shrinking sheet in porous media under the impact of radiation and heat source/sink
Autorzy:
Sharma, R. P.
Jha, A. K.
Gaur, P. K.
Mishra, S. R.
Powiązania:
https://bibliotekanauki.pl/articles/264665.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
promieniowanie cieplne
wytwarzanie ciepła
MHD
nanofluid
shrinking surface
thermal radiation
heat generation
porous medium
Opis:
An investigation has been carried out for the MHD 3-dimensional flow of nanofluid over a shrinking sweet saturating a porous media in the presence of thermal radiation and heat generation. Convective boundary conditions for the flow phenomena are used in the present analysis. The governing equations are reduced to ODEs employing suitable similarity transformations. The solutions of formulated differential equations have been attained mathematically by fourth order R-K technique along with the shooting method. The impact of the governing constraints on momentum, heat, and local Nusselt number, are explored. It is noticed that the momentum and heat decrease with raise in the porosity variable, temperature reduces with an enhance in the thermal radiation variable, and temperature enhances with an enhance in the heat source/sink parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 183-199
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational and experimental model of electroporation for human aorta
Autorzy:
Filipovic, N.
Saveljic, I.
Jovicic, N.
Tanaskovic, I.
Zdravkovic, N.
Powiązania:
https://bibliotekanauki.pl/articles/306780.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
elektroporacja
wytwarzanie ciepła
ablacja
kształtka wodociągowa
przewodnictwo cieplne
electroporation
heat generation
ablation
VSMC reduction
fitting
conductivity
Opis:
Purpose: In this study the computational and experimental electroporation model with human aorta tissue is made in order to examine the reduction of smooth muscle cells. Methods. The segments in native state of the aorta are treated by electroporation method through a series of electrical impulses from 50 V/cm to 2500 V/cm. For each patient we analyzed one sample with and one sample without electroporation as a control. In the computational study, electrical field distribution is solved by the Laplace equation. The Pennes Bioheat equation without metabolism and blood perfusion heating is used to solve heat transfer problems. Different conductivity values are used in order to fit the experimental results. Results: Experimental histology has shown us that there are a smaller number of vascular smooth muscle cells (VSMC) nuclei at the tunica media, while the elastic fibre morphology is maintained 24 h after electroporation. In the computational model, heat generation coupled with electrical field is included. The fitting procedure is applied for conductivity values in order to make material properties of the aorta tissue. The fitting procedure gives tissue conductivity of 0.44 [S/m] for applied electrical field of 2500 V/cm. Conclusions: Future studies are necessary for investigation of a new device for in-vivo ablation with electroporation of plaque stenosis. It will open up a new avenue for stenosis treatment without stent implantation.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 4; 15-20
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of variable viscosity on natural convection flow of an optically thick gray gas past a horizontal surface in the presence of internal heat generation
Autorzy:
Kannan, T.
Malleswaran, A.
Moorthy, M. B. K.
Powiązania:
https://bibliotekanauki.pl/articles/175425.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
assisting and opposing flows
Dufour and Soret effects
internal heat generation
natural convection
radiation
variable viscosity
Opis:
A numerical investigation to discuss the effects of radiation and variable viscosity on heat and mass transfer characteristics of natural convection over a horizontal surface embedded in a saturated porous medium in the presence of internal heat generation is carried out in this study. The working fluid for the investigation is optically thick gray gas. The Dufour and Soret effects are also taken into account. Similarity transformations are employed to obtain nonlinear ordinary differential equations from the governing equations of the present problem. The numerical results for the transformed governing equations are computed by using commercial boundary value problem solver for ordinary differential equations. The effects are discussed by varying the parameters such as radiation, Dufour and Soret numbers, buoyancy ratio, Prandtl number, Schmidt number, and variable viscosity. Presence of internal heat generation enhances the velocity profile and significantly decreases the concentration boundary layer thickness. On increasing fluid radiation, the temperature of the fluid is higher than that of the surface and the concentration boundary layer thickness decreases away from the surface.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2018, 139; 3-22
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obieg kogeneracyjny w wodnych kotłach ciepłowniczych
Autorzy:
Ostrowski, Piotr
Pronobis, Marek
Świątkowski, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/986605.pdf
Data publikacji:
2019
Wydawca:
Nowa Energia
Tematy:
kocioł ciepłowniczy
kocioł wodny
kogeneracja
energia elektryczna
wytwarzanie energii elektrycznej
ciepło
wytwarzanie ciepła
heating boiler
water boiler
cogeneration
electricity
electricity generation
heat
heat generation
Opis:
Kogeneracja - wspólne wytwarzanie energii elektrycznej i ciepła przynosi oszczędności w zużyciu paliw pierwotnych. W związku z tym przyczynia się do redukcji emisji szkodliwych substancji do atmosfery (CO2), co również oznacza zmniejszenie kosztów zewnętrznych wytwarzania energii i ciepła. Do tej pory cykle kogeneracyjne nie były stosowane w ciepłowniach wyposażonych w kotły wodne (wodno-rurowe lub płomienicowo-płomieniówkowe). W artykule przedstawiono koncepcję innowacyjnego obiegu kogeneracji, który współpracuje z wodnym kotłem ciepłowniczym lub przemysłowym, a instalacja kogeneracji nie zmienia zatwierdzenia parametrów technicznych kotła i nie ogranicza zakresu jego użytkowania. Przedstawiono opracowane obiegi porównawcze w układach h-s i T-s, pasmowy wykres energii Sankey'a oraz wykresy wybranych wskaźników kogeneracji. Ponadto przedstawiono wskaźniki ekonomiczne kogeneracji dla kotłów wodnych.
Źródło:
Nowa Energia; 2019, 1; 21-28
1899-0886
Pojawia się w:
Nowa Energia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermosensitive response of a functionally graded cylinder with fractional order derivative
Autorzy:
Lamba, Navneet Kumar
Powiązania:
https://bibliotekanauki.pl/articles/2174162.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termoczułość
naprężenia termiczne
wytwarzanie ciepła
time fractional
thermal stresses
thick hollow cylinder
internal heat generation
FGMs
thermosenstive
Opis:
The present paper deals with thermal behaviour analysis of an axisymmetric functionally graded thermosensitive hollow cylinder. The system of coordinates are expressed in cylindrical-polar form. The heat conduction equation is of time-fractional order02<α≤, subjected to the effect of internal heat generation. Convective boundary conditions are applied to inner and outer curved surfaces whereas heat dissipates following Newton’s law of cooling. The lower surface is subjected to heat flux, whereas the upper surface is thermally insulated. Kirchhoff’s transformation is used to remove the nonlinearity of the heat equation and further it is solved to find temperature and associated stresses by applying integral transformation method. For numerical analysis a ceramic-metal-based functionally graded material is considered and the obtained results of temperature distribution and associated stresses are presented graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 107--124
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internal heat loads in LUNARES analogue planetary base - a case study
Autorzy:
Kaczmarzyk, Marcin
Waśniowski, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/104701.pdf
Data publikacji:
2019
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
space building physics
internal heat gains
analogue space station
metabolic heat generation
analogowa stacja kosmiczna
metaboliczne wytwarzanie ciepła
wewnętrzne zyski ciepła
Opis:
This case study work focuses on recognising and quantifying internal heat sources in the first European analogue planetary base: the recently constructed Polish LUNARES habitat. The paper explains the necessity of conducting analogue space missions prior to an actual manned exploration of the Moon and Mars. Notions of internal heat loads and gains have been elaborated along with their significance for developing space building physics. This paper presents the results of thorough inspection of all internal heat sources, conducted by one of the authors during ICAres-1 Mars analogue mission aboard the LUNARES base. Three main sources of internal heat loads were identified and carefully studied; the habitat’s electrical equipment, the crew body heat and their personal appliances. These heat loads were calculated and total internal heat load of the base was established and discussed. The results of this study may serve as a baseline for predicting internal heat loads aboard actual planetary bases.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2019, 66, 3; 25-36
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of heat generation/absorption on mixed convection flow behaviour in the presence of Lorentz forces in a vertical micro circular duct having time periodic boundary conditions: steady periodic regime
Autorzy:
Aina, B.
Isa, S.
Powiązania:
https://bibliotekanauki.pl/articles/1839783.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja mieszana
mikrokanał
wytwarzanie ciepła
poślizg
mixed convection
micro circular duct
Lorentz force
heat generation
heat absorption
slip and jump
time
Opis:
The problem of mixed convection flow of a heat generating/absorbing fluid in the presence existence of Lorentz forces in a vertical micro circular subjected to a periodic sinusoidal temperature change at the surface has been studied taking the first-order slip and jump effects into consideration. The research analysis is carried out by considering a fully developed parallel flow and steady periodic regime. The governing equations, together with the constraint equations which arise from the definition of mean velocity and temperature, are written in a dimensionless form and mapped into equations in the complex domain. One obtains two independent boundary value problems, which provide the mean value and the oscillating term of the velocity and temperature distributions. These boundary value problems are solved analytically. A parametric study of some of the physical parameters involved in the problem is conducted. The results of this research revealed that the magnetic field has a damping impact on the flow and results in decreases in fluid velocity for both air and water. Furthermore, the presence of the heat generation parameter is seen to enhance the temperature distribution and this is reflected as an increase in the magnitude of the oscillation dimensionless velocity, whereas in the presence of heat absorption a reversed trend occurs.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 1-21
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal radiation and magnetic field effects on unsteady mixed convection flow and mass transfer over a porous stretching surface with heat generation
Autorzy:
Reddy, G. V. R.
Reddy, B. A.
Reddy, N. B.
Powiązania:
https://bibliotekanauki.pl/articles/955276.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie
wymiana masy
rozciąganie
pole magnetyczne
wytwarzanie ciepła
radiation
mass transfer
stretching surface
magnetic field
heat generation
temperature
Opis:
The effects of thermal radiation and mass transfer on an unsteady hydromagnetic boundary layer mixed convection flow along a vertical porous stretching surface with heat generation are studied. The fluid is assumed to be viscous and incompressible. The governing partial differential equations are transformed into a system of ordinary differential equations using similarity variables. Numerical solutions of these equations are obtained by using the Runge-Kutta fourth order method along with the shooting technique. Velocity, temperature, concentration, the skin-friction coefficient, Nusselt number and Sherwood number for variations in the governing thermo physical parameters are computed, analyzed and discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1151-1164
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 16-30 z 54

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