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Tytuł:
Using thermovision for temperature measurements during turning process
Autorzy:
Molenda, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/245100.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
lapping
infrared measurement
lapping plate temperature
lapped surface quality
Opis:
In metal cutting industries, machining processing, especially turning operation is very basic type of machining. For certain processes in manufacturing, it is favourable and necessary to have certain knowledge about heat generation and temperature rise (including average and maximum temperature) during machining process. Increment in maximum temperature at clearance face or at rake face of cutting tool causes the reduction in life of tool. Similarly, the quality of machined surface, a metallurgical structural alteration in tool and workpiece material also depends on the maximum temperature, temperature gradient and cooling rate of both tool and workpiece. Certain physical and chemical reactions that are developed during the cutting process are directly connected with tool wear, power consumption, surface roughness on work piece material and cutting temperature. The natural low of thermal energy gives significant relationship between cutting temperature and cutting parameters in order to improvement of cutting tool’s wok efficiency, quality and accuracy. The heat distribution in cutting tool, in formed chip and in workpiece material strongly depends on (mechanical and chemical) properties of cutting tool and workpiece material, cutting speed, depth of cut, feed rate, nose radius, geometry of tool, type of coolant used and other parameters. This work presents some results of research done during turning steel 235JR realized on conventional lathe CDS 6250 BX-1000 with severe parameters. These demonstrate the necessity of further, more detailed research on turning process temperature, realized for different materials.
Źródło:
Journal of KONES; 2018, 25, 4; 293-298
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature effect on frequencies of a tapered triangular plate
Autorzy:
Khodiya, Akash
Sharma, Amit
Powiązania:
https://bibliotekanauki.pl/articles/1839862.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
temperature effect
triangle plate
frequency
vibration
częstotliwość
wibracja
metoda Rayleigha-Ritza
gradient termiczny
efekt temperaturowy
Opis:
The two dimensional temperature effect on the vibration is computed for the first time for a clamped triangular plate with two dimensional thickness. In the study we focused on isosceles, right-angled and scalene triangles only. The first three modes of vibration are computed on different variations of plate parameters using the Rayleigh-Ritz method. The objective of the study is to reduce the frequency of the plates. A comparative study of the frequencies with other available results well presents the objective of the study.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 1; 37-48
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Distribution in a Steel Beam-to-Column Joint when Exposed to Fire. Part 1: End-Plate Joint
Autorzy:
Maślak, M.
Suchodoła, M.
Woźniczka, P.
Powiązania:
https://bibliotekanauki.pl/articles/105584.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
beam-to-column steel end-plate joint
fire
temperature distribution
joint components
numerical simulation
Opis:
Temperature distribution usually observed in steel beam-to-column end-plate joint after 15 minutes of its standard fire exposure is presented and discussed in detail. Two types of joints are analysed for comparative purposes. The first one is a pure steel connection while the other is covered by a reinforced concrete slab. Numerical simulation of the considered joint heating scenario was performed using the 3D model in the ANSYS environment. Some results were additionally verified by simpler calculations carried out on 2D models using the SAFIR computer program. It is emphasized that due to the local accumulation of many massive steel plates the representative temperature values identified in particular joint components are significantly lower than those which at the same time are measured in beam and column outside the connection. This means that the classic assumption of even temperature over the entire length of all the structural elements of a frame load-bearing structure exposed to fire at any time during such fire, without distinguishing in the formal model any cooler nodal elements, is always safe but very conservative. In addition, as the fire develops the differentiation between the temperature values relating to the beam web and to the beam flanges becomes more visible. This effect is particularly significant in the presence of a massive floor slab adjacent the upper flange of a frame I-beam which effectively cools it.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 25-34
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving the problem of elasticity for round thick plates at axially symmetric strain
Autorzy:
Hvertsev, O.
Selivanova, N.
Powiązania:
https://bibliotekanauki.pl/articles/2140678.pdf
Data publikacji:
2016
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
theory of elasticity
axisymmetric function movement
temperature change
thermodynamically reversible (inverse) process
bending round plate
Opis:
An exact solution of the equations of elasticity for round plates loaded axially symmetric. The problem of bending round plates, which are under the influence of normal forces attached to any law to load any type of resistance. It is shown that pasture circular plate under axially symmetric load leads to appearance of temperature field.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2016, 1, 1; 40-48
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Results of lapping process executed in elevated temperature
Autorzy:
Molenda, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/244971.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
lapping
infrared measurement
lapping plate temperature
lapping results
Opis:
Lapping is used in the production of components of the highest quality in terms of form finish accuracy and surface integrity. A number of precision manufacturing applications use lapping process as a critical technology to achieve thickness tolerance and surface quality specification. Because of required parts accuracy tool flatness is the key to the successful machining. To avoid its excessive thermal expansion, plate temperature research was taken. This paper goal was to check the influence of temperature of executory system elements on lapping process results. In earlier work, authors investigated the dependence between time and the temperature of executory system elements. Tests showed that after five hours of machine working temperature stabilizes and slightly fluctuated around a certain value. Thus, this work concerns lapping results in this elevated temperature. Research was proceed during Al2O3 elements lapping. It was realised with use of ABRALAP 380 lapping machine. The lapping machine executory system consisted of three working conditioning rings. Executory system elements temperature was measured remotely by infrared camera Thermo Gear G100. Elements machining was started after 10, 140, and 270 minutes of machine working time. Studies showed that machine executory system elements temperature affected only the Ra parameter, which is higher for surfaces, which were processed starting from 270th minute of machine working time.
Źródło:
Journal of KONES; 2016, 23, 4; 591-596
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical predictions of laminar flow and free convection heat transfer from an isothermal vertical flat plate
Autorzy:
Belhocine, Ali
Stojanovic, Nadica
Abdullah, Oday Ibraheem
Powiązania:
https://bibliotekanauki.pl/articles/27309866.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
free convective flow
vertical flat plate
similarity solution
boundary layer flow
dimensionless temperature
Prandtl number
Runge-Kutta method
swobodny przepływ konwekcyjny
rozwiązanie podobieństwa
przepływ warstwy granicznej
bezwymiarowa temperatura
numer Prandtla
Metoda Runge-Kutty
Opis:
In this present work, the laminar free convection boundary layer flow of a two-dimensional fluid over the vertical flat plate with a uniform surface temperature has been numerically investigated in detail by the similarity solution method. The velocity and temperature profiles were considered similar to all values and their variations are as a function of distance from the leading edge measured along with the plate. By taking into account this thermal boundary condition, the system of governing partial differential equations is reduced to a system of non-linear ordinary differential equations. The latter was solved numerically using the Runge-Kutta method of the fourth-order, the solution of which was obtained by using the FORTRAN code on a computer. The numerical analysis resulting from this simulation allows us to derive some prescribed values of various material parameters involved in the problem to which several important results were discussed in depth such as velocity, temperature, and rate of heat transfer. The definitive comparison between the two numerical models showed us an excellent agreement concerning the order of precision of the simulation. Finally, we compared our numerical results with a certain model already treated, which is in the specialized literature.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 4; 749--773
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of research for solar cookers performance characteristics- analysis and comparison
Autorzy:
Raghav, Geetanjali
Sharma, Pankaj Kumar
Kumar, Suresh
Maithani, Rajesh
Powiązania:
https://bibliotekanauki.pl/articles/1833748.pdf
Data publikacji:
2021
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
solar cookers
cooking
plate temperature
thermal performance
kuchenka słoneczna
gotowanie
wydajność cieplna
Opis:
Cooking is one of the most common activity in day-to-day life of every woman. In rural areas the transportation of fuel is major problem and the increasing demand of energy for cooking applications is gaining importance and various investigations are being carried out for performance enhancement of the solar cooker. The box-type solar cooker has a complex thermal analysis due to the transient heat transfer phenomenon involved in three dimensions. A comparison of the standard correlation available are analysed for accuracy of predicted results with experimental data. The investigation involves the experimental determination of the parameters viz. wind heat transfer coefficient, side and bottom loss coefficient, inner and outer glass temperature. The extensive data is analysed with that of standard correlations and the significance of the experimental data is checked. Analysis found to have deviation of 3%-20% in experimental and correlation data, which indicates that for accuracy of performance analysis the studied parameters should be determined experimentally.
Źródło:
Acta Innovations; 2021, 39; 54--66
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magneto-thermo-mechanical buckling analysis of Mindlin plate reinforced with FG-carbon nanotubes
Analiza magnetyczno-termo-mechaniczna wyboczenia płyty Mindlina wzmacnianej nanorurkami o funkcyjnej gradacji
Autorzy:
Kolahchi, R.
Esmailpour, M.
Safari, M.
Powiązania:
https://bibliotekanauki.pl/articles/230395.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wyboczenie
pole magnetyczne
nanorurka węglowa
FG-SWCNT
wpływ temperatury
płyta Mindlina
buckling
magnetic field
carbon nanotube
temperature effect
Mindlin plate
Opis:
A buckling analysis of temperature-dependent embedded plates reinforced by single-walled carbon nanotubes (SWCNTs) subjected to a magnetic field is investigated. The SWCNTs are distributed as uniform (UD) and three types of functionally graded nanotubes (FG), in which the material properties of the nano-composite plate are estimated based on the mixture rule. The surrounding temperature-dependent elastic medium is simulated as Pasternak foundation. Based on the orthotropic Mindlin plate theory, the governing equations are derived using Hamilton's principle. The buckling load of the structure is calculated based on an exact solution by the Navier method. The influences of elastic medium, magnetic field, temperature and distribution type, and volume fractions of SWCNT are shown on the buckling of the plate. Results indicate that CNT distribution close to the top and bottom are more efficient than that distributed near the mid-plane for increasing the stiffness of the plates.
Badana jest analiza wyboczenia wbudowanych płyt zależnych od temperatury wzmacnianych jednościennymi nanorurkami węglowymi (SWCNT) poddawanych polu magnetycznemu. Nanorurki SWCNT są rozpowszechniane jako jednolite (UD), a także istnieją trzy typy rozmieszczenia FG (FGA, FGO, FGX). W celu uzyskania równoważnych właściwości materiałowych nanokompozytów dwufazowych (tj. polimer jako matryca i nanorurka węglowa jako wzmocnienie), stosuje się zasadę mieszaniny. Do modelowania matematycznego obecnej struktury stosuje ortotropową teorię płyty Mindlina. W tej teorii odkształcenie normalne i przy ścinaniu są rozpatrywane w kategoriach przemieszczenia punktu materiału na płaszczyźnie środkowej i obrotów normalnej i środkowej płaszczyzny w kierunku osi X i Y. W celu uzyskania obowiązujących równań, stosowana jest metoda energetyczna i zasada Hamiltona. Całkowita energia potencjalna płytki CNTRC to suma energii odkształcenia i pracy wykonanej przez ośrodek elastomerowy i pole magnetyczne. W przypadku energii odkształcenia, zależności przemieszczania w wyniku naprężenia są definiowane w celu uproszczenia. Ośrodek sprężysty zależny od temperatury otoczenia jest stymulowany jako podłoże Pasternaka ze stałą sprężyny i ścinania. Ponieważ ośrodek elastomerowy jest stosunkowo miękki, zakłada się, że sztywność fundamentu jest zależna od temperatury. Ponadto, w przypadku płytki poddawanej stałemu polu magnetycznemu, bierze się pod uwagę przyłożoną siłę masową oraz ocenia się elementy siły Lorentza na jednostkę płytki. Na koniec, korzystając z zasady Hamiltona i integrując wg części, uzyskuje się obowiązujące równania w zakresie wypadkowych naprężeń. Następnie, obliczając wypadkową naprężenia pod względem przemieszczenia i obrotów, uzyskuje się ostateczną formę obowiązujących równań.
Źródło:
Archives of Civil Engineering; 2016, 62, 3; 89-104
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of lapping plate temperature on roughness parameters of specimens
Autorzy:
Molenda, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/242884.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
lapping
infrared measurement
lapping plate temperature
lapped surface quality
Opis:
Lapping is used in the production of components of the highest quality in terms of form finish accuracy and surface integrity. A number of precision manufacturing applications use lapping process as a critical technology to achieve thickness tolerance and surface quality specification. Because of required parts accuracy tool flatness is the key to the successful machining. To avoid its excessive thermal expansion, plate temperature research was taken. This article goal was to check the influence of lapping wheel temperature on workpiece roughness after lapping process. In earlier work, authors investigated the dependence between time and the temperature of executory system elements. Tests showed that after five hours of machine working temperature stabilizes and slightly fluctuated around a certain value. Thus, this work concerns lapping results in this elevated temperature. Research was proceed during Al2O3 elements lapping. It was realised with use of ABRALAP 380 lapping machine. The lapping machine executory system consisted of three working conditioning rings. Executory system elements temperature was measured remotely by infrared camera Thermo Gear G100. Elements machining was started after 10, 140, and 270 minutes of machine working time. Studies showed that machine executory system elements temperature affected only the ΔRa parameter, which is higher for surfaces, which were processed starting from 270th minute of machine working time.
Źródło:
Journal of KONES; 2017, 24, 2; 147-152
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of heating plates temperature on freeze drying energy requirements and quality of dried vegetables
Analiza wplywu temperatury plyt grzejnych liofilizatora na energochlonnosc procesu i cechy jakosciowe suszu z wybranych warzyw
Autorzy:
Krzykowski, A.
Dziki, D.
Polak, R.
Rudy, S.
Powiązania:
https://bibliotekanauki.pl/articles/792446.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
lyophilization
drying
heating plate temperature
freeze dryer
specific drying energy
celery
parsley
carrot
L-ascorbic acid
quality
vegetable
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 2
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and mass transfer effect on an infinite vertical plate in the presence of hall current and thermal radiation with variable temperature
Autorzy:
Manjula, L.
Muthucumaraswamy, R.
Powiązania:
https://bibliotekanauki.pl/articles/2106450.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
efekt Halla
promieniowanie
MHD
Hall effect
radiation
vertical plate
variable temperature
Opis:
MHD and radiated heat flow on a rotating system of an electrically conducting fluid in the presence of Hall current under the influence of variable temperature is studied analytically. An exact solution of a non-dimensional form of coupled partial differential equations is obtained by the technique of Laplace transform. The effect of temperature, velocity and concentration is analyzed for various parameters like the Hall parameter [...], thermal radiation [...], rotation parameter [...], Hartmann number [...] and results are discussed in detail with the help of graphs. A mixed analysis of a rotating fluid with Hall current and thermal radiation plays a very essential role in the research area such as plasma physics, MHD generator, fluid drift sensor, cosmological and geophysical level, etc.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 131--140
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hall effects and rotation effects on MHD flow past an exponentially accelerated vertical plate with combined heat and mass transfer effects
Autorzy:
Thamizhsudar, M.
Pandurangan, J.
Mathucumaraswamy, R.
Powiązania:
https://bibliotekanauki.pl/articles/265402.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Hall effect
MHD flow
rotation
exponentially
accelerated plate
temperature
mass diffusion
magnetohydrodynamika
pole magnetyczne
prędkość osiowa
Opis:
A theoretical solution of flow past an exponentially accelerated vertical plate in the presence of Hall current and MHD relative to a rotating fluid with uniform temperature and mass diffusion is presented. The dimensionless equations are solved using the Laplace method. The axial and transverse velocity, temperature and concentration fields are studied for different parameters such as the Hall parameter (m), Hartmann number (M), Rotation parameter (Ω), Schmidt number, Prandtl number, thermal Grashof number (Gr) and mass Grashof number (Gc). It has been observed that the temperature of the plate decreases with increasing values of the Prandtl number and the concentration near the plate increases with decreasing values of Schmidt number. It is also observed that both axial and transverse velocities increase with decreasing values of the magnetic field parameter or rotation parameter, but the trend gets reversed with respect to the Hall parameter. The effects of parameters m, M, […], Gr and Gc on the axial and transverse velocity profiles are shown graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 3; 605-616
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite difference solution of unsteady flow past an oscillating semi-infinite vertical plate with variable surface temperature and uniform mass flux
Autorzy:
Muthucumaraswamy, R.
Saravanan, B.
Powiązania:
https://bibliotekanauki.pl/articles/955236.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie
płyta pionowa
strumień masy
radiation
vertical plate
finite differences
variable temperature
uniform mass flux
Opis:
A finite difference solution of an unsteady flow past an oscillating semi-infinite vertical place with variable temperature and uniform mass flux is presented here. The fluid considered here is a gray, absorbing-emitting radiation but a non-scattering medium. The dimensionless governing equations are solved by an efficient, more accurate, and unconditionally stable and fast converging implicit scheme. The steady state velocity, temperature and concentration profiles are shown graphically. The effect of velocity and temperature for different physical parameters such as the thermal radiation, Schmidt number, thermal Grashof number and mass Grashof number is studied. It is observed that the velocity decreases in the presence of thermal radiation. It is also observed that the time taken to reach a steady-state is more in the case of vertical plate than horizontal plate.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 709-724
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exponential temperature effect on frequencies of a rectangular plate of non-linear varying thickness: a quintic spline technique
Autorzy:
Gupta, A. K.
Mamta, J.
Powiązania:
https://bibliotekanauki.pl/articles/949230.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
exponentially temperature
non-linear
thickness variation
vibration
rectangular plate
Opis:
The differential equation governing the transverse motion of an elastic rectangular plate of non-linear thickness variation with thermal gradient has been analyzed on the basis of classi- cal plate theory. Following Levy’s approach, i.e. the two parallel edges are simply supported, the fourth-order differential equation governing the motion of such plates of non-linear vary- ing thickness in one direction with exponentially temperature distribution has been solved by using the quintic splines interpolation technique for two different combinations of clamped and simply supported boundary conditions at the other two edges. An algorithm for com- puting the solution of this differential equation is presented for the case of equal intervals. The effect of thermal gradient together with taper constants on the natural frequencies of vibration is illustrated for the first three modes of vibration.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 15-24
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emissivity of the one - plate lapping machine tool
Autorzy:
Molenda, J.
Barylski, A.
Powiązania:
https://bibliotekanauki.pl/articles/248024.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
lapping
infrared measurement
lapping plate temperature
lapping parameters
emissivity
Opis:
A number of precision manufacturing applications use lapping process as a critical technology to achieve thickness tolerance and surface quality specification. Typical examples of the processed components are pump parts, transmission equipments, cutting tools, hydraulic and pneumatics, aerospace parts, inspections equipment, stamping and forging. Lapping leads to a surface with low roughness and high precision. It is carried out by applying loose abrasive grains between work and lap surfaces, and causing a relative motion between them resulting in material removal. The grains activities in the working gap cause also temperature rise of the executory system elements, including lap plate. Because of required parts accuracy tool flatness is the key to the successful machining. To avoid its excessive thermal expansion, plate temperature research was taken. Temperature is the most often measured physical quantity, second only to time. All advantages of infrared technology have led it to become frequently used technique for temperature measurement. It was also used by authors for lapping process observation. To assure accurate noncontact infrared temperature measurement there is a need to keep in mind several factors, including determining appropriate value of emissivity. Incorrectly, designated emissivity results in bigger measuring error. This work presents a method for determining wheel emissivity and its value obtained by presented way. To find emissivity of the lapping plate infrared camera V-20 II produced by VIGO System S.A. and contact thermometer TES1312 Dual K-Type were used. The experiments were carried out on a plate-lapping machine ABRALAP 380 with a grooved cast-iron lapping plate and three conditioning rings. The determined emissivity was equal 0.95 and was bigger than value from the table, as was expected. During lapping wheel surface is in fact very dark due to charging and covering the waste slurry. Obtained value will be used in future measurements.
Źródło:
Journal of KONES; 2012, 19, 1; 283-288
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
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