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Wyszukujesz frazę "low pressure" wg kryterium: Temat


Tytuł:
Performance of three turbulence models in 3D flow investigation for a 1.5-stage turbine
Autorzy:
Karczewski, M.
Błaszczak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1943250.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska
Tematy:
turbulence modeling
numerical research
low-pressure turbine
Opis:
The object of this study was to investigate the flow phenomena in a cold air turbine built at the Institute of Jet Propulsion and Turbomachinery at Aachen Technical University (IST RWTH Aachen, Germany). The said turbine had been studied previously both experimentally and numerically on an IST’s flow solver called Panta Rhei. Since that time certain improvements, computational-wise, have been implemented in the code. In order to test them, new simulation runs were conducted. The detailed studies of the measured and computed flow angles as well as a flow velocity analysis are the means for this evaluation.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2008, 12, 3-4; 185-195
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza czasu transportu kontenerów intermodalnych z Chin do UE za pomocą technologii Hyperloop
Analysis of time of intermodal container transport from China to the EU by means of Hyperloop technology
Autorzy:
Rumin, Rafał
Kozioł, Kamil
Polak, Joanna
Hyla, Paweł
Blaut, Jędrzej
Powiązania:
https://bibliotekanauki.pl/articles/310216.pdf
Data publikacji:
2019
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
Hyperloop
FlexSim
kolej niskociśnieniowa
low-pressure railway
Opis:
Artykuł przedstawia potencjał ekonomiczny drzemiący w wymianie handlowej pomiędzy Chinami, a Unią Europejską przy użyciu nowego środka transportu - kolei niskociśnieniowej. Technologia opiera się na przewożeniu dóbr w kapsułach, poruszających się wewnątrz szczelnie zamkniętej tuby, w której ciśnienie obniżone jest do około 100Pa. Dzięki niskiemu ciśnieniu, opór powietrza wewnątrz tuby również jest bardzo niski, co pozwala kapsule na poruszanie się w niej bez znaczących strat energii. W przyszłości umożliwi to bardzo szybki i ekonomiczny transport dóbr pomiędzy Chinami i Europą. Uważa się, że kapsuła będzie w stanie osiągnąć prędkość około 1000km/h. W oparciu o te założenia, zaistniały nowe perspektywy w obszarze wymiany handlowej Europy z Chinami. Dotyczy to w szczególności okręgów przemysłowo- przeładunkowych jak Sinchuan, Yunnan, Kweichow czy Chongqing. Potencjał tych regionów to 200 milionowa populacja, terytorium o powierzchni dwukrotnie większej od Francji oraz szybki wzrost gospodarczy - około 10%. W 2016 roku, pociąg z Chengu do Łodzi wyruszył 463 razy, natomiast w 2017 było już około 1000 kursów. Gospodarka Sinchuan opiera głównie się na: rolnictwie, energetyce wodnej, dużych zasobach gazu, przemyśle ciężkim i elektronice. Gospodarka Chongqing bazuje na: motoryzacji, przemyśle ciężkim, elektronice oraz przemyśle chemicznym. W Yunnan natomiast dominują przetwórstwo rolne, zasoby naturalne oraz przemysł ciężki. Z punktu widzenia interesów Polski, na największą uwagę zasługują okręgi Sinchuan i Chongqing. To one czerpią największe korzyści z rozwoju chińskiej gospodarki. Współtworzą również Nowy Jedwabny Szlak - projekt OBOR (ang. One Belt One Road) i aspirują do stania się handlowym, finansowym, technologiczno-naukowym i telekomunikacyjno-transportowym centrum świata.
The article presents the economic potential of trade between China and the European Union using a new means of transport - low-pressure railways. The technology is based on the transport of goods in capsules, moving inside a tightly closed tube, in which the pressure is lowered to about 100Pa. Thanks to the low pressure, the resistance of the air inside the tube is also very low, which allows the capsules to move in it without significant energy losses. In the future, this will make it possible to transport goods very quickly and economically between China and Europe. It is believed that the capsule will be able to reach a speed of about 1000km/h. Based on these assumptions, there are new prospects for Europe's trade with China. This applies in particular to industrial and transhipment districts such as Sinchuan, Yunnan, Kweichow and Chongqing. These regions have a population of 200 million, a territory twice as large as France, and rapid economic growth of around 10%. In 2016, the train from Cheng to Łódź set off 463 times, while in 2017 there were already about 1000 chickens. The economy of Sinchuan is mainly based on: The economy of Sinchuan is mainly based on: agriculture, hydroelectricity, large gas resources, heavy industry and electronics. Chongqing's economy is based on: The Chongqing economy is based on: automotive, heavy industry, electronics and chemical industry. Yunnan is dominated by agricultural processing, natural resources and heavy industry. The Sinchuan and Chongqing districts deserve the most attention from the point of view of Polish interests. They benefit most from the development of the Chinese economy. They also co-create the New Silk Road - the OBOR (One Belt One Road) project and aspire to become a commercial, financial, technological, scientific and telecommunication and transport centre of the world.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2019, 20, 1-2; 452-457
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of pumping units equipped with oscillating hydraulic pressure intensifiers for displacement of cylinders with heavy loads over the entire stroke
Autorzy:
Popescu, Teodor-Costinel
Chiriță, Alexandru Polifron
Popescu, Ana-Maria Carla
Popescu, Alina-Iolanda
Powiązania:
https://bibliotekanauki.pl/articles/27324338.pdf
Data publikacji:
2022
Wydawca:
Instytut Techniki Górniczej KOMAG
Tematy:
low-pressure pumping unit
oscillating hydraulic pressure intensifier
high pressure
hydraulic cylinder
Opis:
Working and moving in confined, limited and narrow spaces, specific to underground mining activities, also requires the use of hydraulically operated equipment, capable of developing large forces, with small dimensions. An example of such equipment includes pumping units comprising low-pressure electric pumps and oscillating hydraulic pressure intensifiers. They use low pressure in the primary side of the intensifier and generate high pressure in the secondary side of the intensifier. Such pumping units are usually used to achieve and maintain high pressure, either in the volumes of closed spaces (in strength tests on pipes and tanks) or at the end of the active stroke of hydraulic cylinders (in hydraulic presses). On an experimental laboratory bench, which comprises a test cylinder, powered by a pumping unit, equipped with an oscillating hydraulic pressure intensifier, and a load cylinder, powered by another pumping unit, with the possibility of load control, the authors show that: the application range of these pumping units can be extended in the third direction, too, useful for underground mining activities, namely for drive of hydraulic cylinders with low gauge / displacement speeds and constant high load (high working pressure) over the entire working stroke length; the uniformity of displacement of these cylinders, with load throughout the stroke length, which are powered and driven with such pumping units, is slightly affected by the pulsating mode of operation of the hydraulic pressure intensifier. A set of experimental measurement results is presented for a constant value of the load over the entire displacement stroke of the test cylinder.
Źródło:
Mining Machines; 2022, 40, 4; 238--248
2719-3306
Pojawia się w:
Mining Machines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous extraction of vanadium and chromium from vanadium slag using low-pressure liquid phase oxidation method
Autorzy:
Xia, J.-P.
Zheng, S.-L.
Wang, S.-N.
Liu, B.
Zou, X.
Powiązania:
https://bibliotekanauki.pl/articles/110818.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium slag
low pressure leaching
liquid phase oxidation
kinetics
Opis:
A low-pressure liquid oxidation method was proposed and proven to be effective to extract vanadium and chromium simultaneously from the vanadium slag in concentrated NaOH aqueous solutions. The effect of temperature, NaOH mass concentration, liquid-to-solid mass ratio, stirring speed and pressure on the extraction of vanadium and chromium in NaOH aqueous solutions were systematically investigated. Under the optimal reaction conditions (temperature of 473 K, liquid-to-solid mass ratio of 6:1, stirring speed of 700 rpm, NaOH mass concentration of 50%, pressure of 1 MPa and reaction time of 180 min), the vanadium and chromium recovery reached 95% and 90%, respectively. It was found that the reaction temperature and NaOH concentration were important factors for the extraction of vanadium and chromium. The kinetics of the decomposition of vanadium slag in concentrated NaOH aqueous under low pressure was analyzed using the shrinking core model, and the results indicated that the extraction of vanadium and chromium were both governed by the internal diffusion step, with apparent activation energies calculated to be 26.22 and 32.79 kJ/mol, respectively.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 609-619
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of the dielectric barrier discharge for helium ash measurements in the divertor region
Autorzy:
Książek, I.
Brosławski, A.
Janus, H.
Pawelec, E.
Powiązania:
https://bibliotekanauki.pl/articles/148807.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dielectric barrier discharge (DBD)
low pressure discharge
fusion plasma
Opis:
Controlled fusion based on the magnetic confinement of the plasma is one of the main aims of the Eurofusion programme. In the fusion device, the hydrogen isotopes, in nuclear reactions, will produce helium nuclei. The products, as the ash, will be removed from the plasma in the region of the so-called divertor. Controlling the helium to hydrogen ratio in this ‘exhaust gas’ will provide information about the efficiency of the fusion process as well as of the efficiency of the helium removal system. One of the methods to perform this task is to study the properties of the discharge conducted in such exhaust gas. In this paper, the applicability of the dielectric barrier discharge (DBD) is studied. This preliminary experiment shows a great potential in applicability of this kind of discharge. The optical as well as pulse-height spectra were studied, both revealing very promising properties. In the optical spectrum, one can observe well separated hydrogen and helium spectral lines, with intensities of the same order of magnitude. Moreover, in the registered spectral region, the molecular spectra are negligible. The pulse-height spectra reveal very distinct shape in helium and hydrogen. Checking of this spectrum could provide parallel (redundant) information about the partial pressure of helium in the magnetic confinement fusion (MCF) device exhaust gas.
Źródło:
Nukleonika; 2016, 61, 2; 99-102
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distortion of 16MnCr5 steel parts during low-pressure carburizing
Autorzy:
Dybowski, K.
Niewiedzielski, R.
Powiązania:
https://bibliotekanauki.pl/articles/102321.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
thermo-chemical treatment
low pressure carburizing
distortion
gas quenching
Opis:
One of the many advantages of low pressure carburizing (LPC) is that it can be combined with high-pressure gas quenching. This makes it possible to achieve workpieces with pure metallic surfaces, less distortion hardening, and, above all, it allows a more reliable and repeatable treatment than conventional oil quenching. This article presents a study of the distortion rate of workpieces carburized at low pressure then quenched in nitrogen at 1.4 MPa. By comparing the distortion which takes place during the carburizing stage only and the carburizing combined with post-carburizing heat treatment it will be possible to assess the distortion rate and its causes at the different stages of the heat treatment process.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 1; 201-207
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of sodium sulfide waste water recycling on the separation of chalcopyrite and molybdenite
Autorzy:
Wu, D.
Peng, H.
Abdalla, M.
Powiązania:
https://bibliotekanauki.pl/articles/110657.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
vanadium slag
low pressure leaching
liquid phase oxidation
kinetics
Opis:
The effect of sodium sulfide waste water recycling on the separation of chalcopyrite and molybdenite was investigated in this work. The waste water, which was separated from the slurry after selective flotation, was recycled in the flotation system. This operation significantly improved the subsequent flotation of chalcopyrite and saved the reagent. The results showed that the depression efficiency of sodium sulfide gradually disappeared in the recycling tests due to the consumption. The consumption of sodium sulfide in the separation was not only caused by the adsorption on mineral surfaces but also resulted from the precipitation of metal ions which released from minerals. These effects decreased the solution reducibility and the adsorption of hydrosulfide ions, finally resulting in the less depression for chalcopyrite flotation. After adding a certain amount of sodium sulfide to the recycling, the depression of chalcopyrite performed well and the pulp potential maintained at a relatively lower level. Moreover, the pulp potential was an available parameter to control the flotation separation of chalcopyrite and molybdenite, which made the method easily applied to industry.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 629-638
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D multistage computations of turbine flows using different state equations
Autorzy:
Rusanov, A. V.
Yershov, S.
Lampart, P.
Świrdyczuk, J.
Gardzielewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/1931597.pdf
Data publikacji:
2002
Wydawca:
Politechnika Gdańska
Tematy:
3D RANS model
state equation
low pressure steam turbine
Opis:
The paper describes the implementation of a modified state equation for perfect gas and Tammann equation into a 3D RANS solver FlowER. In the modification the specific heats are assumed as linear functions of temperature. A 5-stage LP steam turbine stage is calculated, and the comparison of results for constant and variable specific heats is illustrated. The modification significantly improves the correctness of determination of thermodynamic parameters in the entire flow region, especially in the exit stage.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 4; 591-600
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eshhjo raz o radiusakh ehlektrichnogo kolesa
Once again about radius of elastic wheel
Autorzy:
Pozhidaev, S.
Powiązania:
https://bibliotekanauki.pl/articles/77220.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
elastic wheel
rolling radius
ultra low pressure
energy conservation
linear velocity
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 3
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental verification of integrity of low-pressure injection piles structure – pile internal capacity
Autorzy:
Pachla, H.
Powiązania:
https://bibliotekanauki.pl/articles/178587.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
contact surface
foundation design
low-pressure injection pile
pile internal capacity
Opis:
The idea of strengthening the foundation using injection piles lies in transferring loads from the foundation to the piles Anchorage in existing structure and formed in the soil. Such a system has to be able to transfer loads from the foundation to the pile and from the pile onto the soil. Pile structure often reinforced with steel element has to also be able to transfer such a loading. According to the rules of continuum mechanics, the bearing capacity of such a system and a deformation of its individual elements can be determined by way of an analysis of the contact problem of three interfaces. Each of these surfaces is determined by different couples of materials. Those surfaces create: pile-foundation anchorage, bonding between reinforcement and material from which the pile is formed and pilesoil interface. What is essential is that on the contact surfaces the deformation of materials which adhere to each other can vary and depends on the mechanical properties and geometry of these surfaces. Engineering practice and experimental research point out that the failure in such structures occurs at interfaces. The paper is concentrating on presenting the experiments on interaction between cement grout and various types of steel reinforcement. The tests were conducted on the special low pressure injection piles widely used to strengthen foundations of already existing structures of historical buildings due to the technology of formation and injection pressure.
Źródło:
Studia Geotechnica et Mechanica; 2017, 39, 4; 77-85
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-tier low pressure cylinders for condensing steam turbines
Autorzy:
Zaryankin, A.
Powiązania:
https://bibliotekanauki.pl/articles/175404.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-tier stage
two-tier low pressure cylinder
fork-shaped blade
Opis:
The paper deals with new construction of low pressure cylinder (LPC) for condensing steam turbines. The flow path of these cylinders is formed on the base of new two-tier stages. As opposed to well known Baumann’s stages newer two-tier stages is a combination of two independent stages with own blades set. Such construction allows to decrease the number of LPC in the existing turbines or to ensure their operation with very high vacuum in the condenser or increases in 1.5 times power capacity of new turbines without increasing of the last stage blade length and LPC number.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2014, 126; 123-130
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical solution for improve the efficiency of the steam turbines
Autorzy:
Bilyk, Y.
Martsinkovsky, V. S.
Nosowa, O.
Tarelnik, V.
Yurko, V.
Powiązania:
https://bibliotekanauki.pl/articles/175480.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-tier stage
two-tier low pressure cylinder
fork-shaped blade
Opis:
This paper presents effective ways to increase the carrying and reliability of thrust bearings. Technical solutions implemented by TRIZ Ltd have been considered. In comparative characteristics of the bearing took into account such factors as: capacity, peripheral speed at the average radius, speed at the periphery, specific pressure, specific lubricant consumption. Comprehensive analysis of the working conditions of bearing was aimed to protect against electroerosion.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 130; 31-55
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected plasma nitriding methods usable for the thermo-chemical treatment of aircraft parts
Autorzy:
Grzesiak, G.
Zahorski, T.
Stypniak, M.
Walkowicz, J.
Jurczyszyn, R.
Powiązania:
https://bibliotekanauki.pl/articles/244738.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
plasma nitriding
aircraft part
Direct Current Plasma Nitriding
Low Pressure Nitriding in AEGD plasma
Low Pressure Nitriding in Arc Enhanced Glow Discharge plasma
active screen plasma nitriding
Opis:
The aim of the work was to review selected methods of plasma nitriding, which according to the authors might he used in the thermo-chemical treatment of aircraft parts. The introduction explains the nitriding process and presents the requirements on the thermo-chemical treatment of aircraft parts. Three methods of plasma nitriding have been described: Direct Current Plasma Nitriding (DCPN), Active Screen Plasma Nitriding (ASPN) and Low Pressure Nitriding in AEGD (Arc Enhanced Glow Discharge) plasma. While describing DCPN plasma nitriding method, authors drew attention to known problems, which occur in this process such as edge effect or hollow cathode effect. The Keller's model, the Marchand's model and the Walkowicz's model of nitriding process, which can be found in the literature, were also presented in this work. Another purpose of this work was to present hypotheses about the transportation of nitrogen during Active Screen Plasma Nitriding process and to show that in this nitriding method, defects typical for Direct Current Plasma Nitriding do not occur. While describing Low Pressure Nitriding in AEGD plasma, authors also presented the model of nitriding mechanism in this process, which shows four nitrogen diffusion paths (physisorption, chemisorption, adsorption ofNj, ion implantation). Examples of layers obtained by applying described nitriding methods were presented. The measurement ofnitrided layers confirmed that it is possible to obtain a layer without E film on the surface.
Źródło:
Journal of KONES; 2014, 21, 4; 145-152
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of new make-ups of surfactants for foam production
Autorzy:
Turitsyna, M. V.
Yakovlev, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/298910.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
drilling
productive layer
abnormally low pressure
well cleanout
liquid-gas mixtures
surfactants
Opis:
An analysis and estimation of deposits with zones of abnormally low formation pressure of a productive layer of the Perm region, Western and Eastern Siberia have been carried out. Some questions related to well cleanout with the use of liquid-gas mixtures have been considered. Some experiments with surfactants for producing foam have been conducted.
Źródło:
AGH Drilling, Oil, Gas; 2012, 29, 2; 389-393
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions of proper interaction of low-pressure injection piles (LIP) with structure and soil, carrying capacity of pile anchorage in foundation
Autorzy:
Pachla, H.
Powiązania:
https://bibliotekanauki.pl/articles/178602.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
low-pressure injection pile
pile anchorage in foundation
contact surface
foundation design
Opis:
The formation of a pile in the existing foundation and soil creates a new foundation construction which has a structure of foundation-pile-soil. This construction must be able to transfer loads from the foundation to the pile and from the pile to the soil. The pile structure has to transfer an imposed load. From the point of view of continuum mechanics determination of the capacity of such a system is preceded by the analysis of contact problem of three contact surfaces. Each of these surfaces is determined by different pairs of materials. The pair which creates a pile anchorage is a material from which the foundation is built (structure of stone and grout, brick and grout, concrete or reinforced concrete and grout. The pile structure is formed by grout and steel rebar. The pile formed in soil is created by a pair of grout and soil. What is important is that on contact surfaces the materials adhering to one another are subjected to different deformation types that are controlled by mechanical properties and geometry of these surfaces. In the paper, additional conditions that should be fulfilled for the foundation-pile-soil system to make load transfer from foundation to soil possible and safe are presented. The results of research done by the author on foundation-pile contact surface are discussed. The tests were targeted at verifying the bearing capacity of anchorage and deformation of piles made of grout and other materials from which foundations are built. The specimens were tested in tension and compression. The experiments were conducted on the amount specimens which is regarded as small sample to enable the statistical analysis of the results.
Źródło:
Studia Geotechnica et Mechanica; 2016, 38, 4; 33-49
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł

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