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Wyświetlanie 1-15 z 63
Tytuł:
The Hall effect on MHD 2-fluid unsteady heat transfer flow of plasma in a rotating system via a straight channel between conducting plates
Autorzy:
Raju, T. Linga
Rao, B. Venkata
Powiązania:
https://bibliotekanauki.pl/articles/2174207.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wymiana ciepła
efekt Halla
plazma
unsteady flow
MHD
immiscible flow
heat transfer
Hall effect
plasma
rotating frame
conducting plate
Opis:
Hall currents are used to investigate MHD unsteady two fluid flows and heat transport of plasma along a straight channel of conducting plates. In the two liquid zones, the velocity and temperature fields for the case of conducting side plates are obtained by solving the governing equations using a two-term series under the specified conditions. The distribution profiles are graphically resolved and examined. The distributions are thought to be dependent on the electron-to-total pressure ratio. The flow and heat transfer factors are also influenced by other parameters such as the Hartmann number, Hall parameter, rotation parameter, thermal conductivity and viscosity ratio.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 137--162
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady electro-magneto hydrodynamic flow and heat transfer of two ionized fluids in a rotating system with Hall currents
Autorzy:
Raju, T. Linga
Rao, B. Venkat
Powiązania:
https://bibliotekanauki.pl/articles/2174167.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
transfer ciepła
przepływ nieustalony
plazma
pole magnetyczne
pole elektryczne
unsteady flow
magnetic field
electric field
immiscible flow
plasma
Hall effect
rotating frame
heat transfer
insulating plate
Opis:
An unsteady flow and heat transmission of ionized gases via a horizontal channel enclosed by non-conducting plates in a rotating framework with Hall currents is examined using electro-magnetohydrodynamic (EMHD) two-fluid heat flow. The Hall current impact is taken into account by assuming that the gases are totally ionized, the applied transverse magnetic field is very strong. For temperature and velocity distributions in two-fluid flow regions, the governing equations are solved analytically. For numerous physical parameters such as the Hartmann number, Hall parameter, rotation parameter, viscosity ratio, and so on, numerical solutions are visually displayed. It was discovered that an increase in temperature in the two regions is caused by the thermal conductivity ratio. It was also realized that an increase in rate of heat transfer coefficient at the plates is caused by either the Hartman number or the Hall parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 125--145
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Device for Measuring the Rotational Speed of a Chain Sprocket of a Petrol Chainsaw
Autorzy:
Wróbel, Mateusz
Jakubek, Bartosz
Rukat, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2123289.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
magnetic field
chainsaw
rotational speed measurement
chain sprocket
hall effect sensor
Opis:
The procedure for determining the frequency-weighted RMS values of vibration accelerations in the case of petrol chainsaws proposes equal time shares of three operation modes of the chainsaw. In order to assess the actual operator’s vibration exposure, it is necessary to precisely determine the above-mentioned shares. In real-life conditions operation of chainsaws is characterized by frequent and significant rotational speed changes depending on the operation mode. Therefore, a prototype of dedicated device for measuring the rotational speed of a chain sprocket was developed. The article presents development requirements, encountered problems and their solutions, the prototype itself and functional test results.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 3; 99--107
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Hall currents on unsteady magnetohydrodynamic two-ionized fluid flow and heat transfer in a channel
Autorzy:
Raju, T. Linga
Rao, V. Gowrisankara
Powiązania:
https://bibliotekanauki.pl/articles/1839879.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
czujnik Halla
wymiana ciepła
magnetohydrodynamika
Hall currents
heat transfer
magnetohydrodynamics
multi-fluid model
plasma flows
Opis:
An unsteady magnetohydrodynamic (MHD) heat transfer two-fluid flow of ionized gases through a horizontal channel between parallel non-conducting plates, by taking Hall currents into account is studied. The governing partial differential equations that describe the flow and heat transfer under the adopted conditions are solved for the velocity and temperature distributions by a regular perturbation technique. Profiles for the velocity and temperature distributions as well the rates of heat transfer coefficient are presented graphically, and a parametric study is performed. The results reveal that the combined effects of the Hartmann number, Hall parameter, and the ratios of viscosities, heights, electrical and thermal conductivities have a significant impact on an unsteady MHD heat transfer two-ionized fluid flow characteristics.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 84-106
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electro-magnetohydrodynamic two fluid flow of ionized-gases with hall and rotation effects
Autorzy:
Linga Raju, T.
Powiązania:
https://bibliotekanauki.pl/articles/2174161.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pole magnetyczne
pole elektryczne
plazma
wymiana ciepła
magnetic field
electric field
immiscible flow
plasma
Hall effect
rotating frame
heat transfer
insulating plate
Opis:
An electro-magnetohydrodynamic (EMHD) two fluid flow and heat transfer of ionized gases through a horizontal channel surrounded by non-conducting plates in a rotating framework with Hall currents is investigated. The Hall effect is considered with an assumption that the gases are completely ionized and the strength of the applied transverse magnetic field is strong. The governing equations are solved analytically for the temperature and velocity distributions in two fluid flow regions. The numerical solutions are demonstrated graphically for various physical parameters such the Hartmann number, Hall parameter, rotation parameter, and so on. It was noticed that an increment is either due to the Hall parameter or the rotation parameter reduces the temperature in the two regions.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 128--144
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
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:
Magnetotransport measurements as a tool for searching 3D topological insulators
Autorzy:
Śliż, Paweł
Sankowska, Iwona
Bobko, Ewa
Szeregij, Eugeniusz
Grendysa, Jakub
Tomaka, Grzegorz
Żak, Dariusz
Płoch, Dariusz
Jasik, Agata
Powiązania:
https://bibliotekanauki.pl/articles/2052167.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
materials science
magnetotransport
topological insulators
quantum Hall effect
Opis:
The paper covers some measurement aspects of transport of electrons through metals and semiconductors in magnetic field - magnetotransport - allowing for the determination of electrical parameters characteristic of three-dimensional (3D) topological insulators (TI) (i.e. those that behave like an insulator inside their volume and have a conductive layer on their surface). A characteristic feature of the 3D TI is also a lack of differences between the chemical composition of the conductive surface and the interior of the material tested and the fact that the electron states for its surface conductivity are topologically protected. In particular, the methods of generating strong magnetic fields, obtaining low temperatures, creating electrical contacts with appropriate geometry were presented, and the measurement methods were reviewed. In addition, the results of magnetotransport measurements obtained for two volumetric samples based on the HgCdTe compound grown with the molecular beam epitaxy method are presented.
Źródło:
Metrology and Measurement Systems; 2021, 28, 4; 725-734
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of rent in urban land and housing value and the building violations in Sanandaj city in Iran
Autorzy:
Kamanroodi, Moosa
Jafarpour Ghalehteimouri, Kamran
Powiązania:
https://bibliotekanauki.pl/articles/1038120.pdf
Data publikacji:
2020
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
Sanandaj
land and housing rents
land and housing value
building violations
city hall performance
Opis:
Rent is defined as surplus or non-productive profits that are pursued to create naturally (inherited) or fabricated scarcity from a specific product. The value of the land is about the natural and fabricated drivers influence on finalization of the land price and the value of the consumption and trading of urban lands causes “rent” and the unequal profit from the production of housing. Building violations in the city refer to processes for the building and use of which are not licensed (or licensed) or in conflict with the building permit issued by the city hall. This research paper is about the occurrence of building violations, land/housing rent, and the performance of the city hall in this regard in Sanandaj from 2003 to 2011. This research is fundamental and applied research, which has been done by the descriptive-analytical method. Data and information about this research were collected through available documents, reports, and library books, field studies, descriptive statistics, and Pearson Correlation Coefficient were interpreted and analyzed. Based on the findings of this study, out of 8,772 building licenses issued in Sanandaj from 2003 to 2011, 2,886 cases (35.75%) resulted in 6,291 violations per plot of 20,4294 square meters. The results of this study have shown that land rent and housing, a licensing process and sales of building surplus and city hall earnings have a significant effect on the occurrence had a significant impact on the spatial distribution of building violations in Sanandaj city. The most of the issuance of building permits (98.22%), sales of the floor area ratio surplus of a building, and building violations occurred in the district 3 of Sanandaj, which enjoyed higher land rent, housing, and a remarkable proportion of the city hall’s revenue, was also provided.
Źródło:
Academicus International Scientific Journal; 2020, 22; 67-89
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and analysis of MOS based Magnetic Field Sensor
Autorzy:
Kumar, Rakesh
Powiązania:
https://bibliotekanauki.pl/articles/1075557.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CMOS Technology
Hall Effect
Lorentz force
MagFET device
Magnetic sensor
Opis:
Magnetic sensors are widely used in various applications such as consumer electronic products (mobile phones, laptops), biomedical applications (brain function mapping), navigation, vehicle detection, mineral prospecting, non-contact switching (keyboard), contactless temperature measurement, wireless sensor network etc. Sensitivity of MagFET devices towards magnetic field, depends on the shape, dimensions VGS, VDS. In this paper we have measured effect of Physical design of gate on sensitivity of MagFET.
Źródło:
World Scientific News; 2019, 121; 42-47
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semiconductor contact layer characterization in a context of hall effect measurements
Autorzy:
Kowalewski, Andrzej
Wróbel, Jarosław
Boguski, Jacek
Gorczyca, Kinga
Martyniuk, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/220890.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal contact
contact layer
contact resistance
Hall effect
resistivity
van der Pauw method
MSM structure
semiconductors’ characterization
Opis:
A revision of the standard approach to characterization of thin-semiconductor-layer Hall samples has been proposed. Our results show that simple checking of I(V) curve linearity at room temperature might be insufficient for correct determination of bias conditions of a sample before measurements of Hall effect. It is caused by the nonlinear behaviour of electrical contact layers, which should be treated together with the tested layer a priori as a metal-semiconductor-metal (MSM) structure. Our approach was examined with a Be-doped p-type InAs epitaxial layer, with four gold contacts. Despite using full high-quality photolithography a significant asymmetry in maximum differential resistance (Rd) values and positions relative to zero voltage (or current) value was observed for different contacts. This suggests that such characterization should be performed before each high-precision magneto-transport measurement in order to optimize the bias conditions.
Źródło:
Metrology and Measurement Systems; 2019, 26, 1; 109-114
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of rotor position sensor fault tolerant control in electric vehicle with PM BLDC motor drives
Autorzy:
Skóra, M.
Powiązania:
https://bibliotekanauki.pl/articles/140658.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PM BLDC motor
Hall effect sensor
fault tolerant drive
ZOA
electric vehicle
Opis:
In order to develop a PM BLDC motor control system, which will be tolerant of selected faults, simulation work was first performed and then verified on a universal test stand. The results were published in earlier works. The next stage of works was the implementation of previously developed algorithms on the target research test stand – in this case, the prototype vehicle. This last stage of the laboratory work has been presented in this article, i.e. it has been presented the results of experimental research related to the reproduction of rotor angle position, used after the detection of a rotor position sensor fault. A new test stand with the laboratory prototype of a vehicle with two PM BLDC motors is presented. A zeroth-order algorithm (ZOA) was used as a fault compensation method. The effectiveness and usefulness of the previously proposed methods have been confirmed.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 725-738
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electroplastic deformation by twinningmetals
Autorzy:
Savenko, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/386875.pdf
Data publikacji:
2018
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
electroplastic deformation
ponderomotive action current
pinch effect
skin effect
pulse current
magnetic field
electric field vortex field hall
mechanical pressure
maximum axial force
Opis:
The article deals with theoretical and experimental approaches to electroplastic deformation caused by twinning of metals. The author specifies physical fundamentals of Kinetics regarding the development of twinning caused by the excitation of electronic subsystem of metals. Physical models of new channels for the realization of twinning aroused under conditions of electroplasticity have been discussed. Mechanisms of plasticized influence of a surface electric charge have been defined as well as the contribution of a dynamic pinch-effect in the elastic plastic deformation of metals with the participation of the intrinsic magnetic field of the current. The dynamic pinch effect creates ultrasonic vibration of the lattice system while Kinetics changes and plastic deformation are stimulated increasing the amplitude of the oscillations of rectilinear dislocations and the periodic change in the position of the dislocation loops with an increase in the probability of detachment of dislocations from the stoppers. When deformed above the yield point and due to the pinch effect the intrinsic magnetic field of the current diffuses into the crystal where the diffusion rate depends both on the conductivity of the metal and on the frequency of the current. It is necessary to take into account the physical conditions for the creation of ponderomotive effects in relation to specific technically important materials for the practical use of electroplastic deformation technology, especially when processing metals with pressure.
Źródło:
Acta Mechanica et Automatica; 2018, 12, 4; 259-264
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hall effect on MHD transient flow past an impulsively started infinite horizontal porous plate in a rotating system
Autorzy:
Prabhakar Reddy, B.
Powiązania:
https://bibliotekanauki.pl/articles/266176.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
płyta pozioma
metoda Galerkina
Hall current
MHD
transient
rotation
horizontal plate
Galerkin FEM
Opis:
In this paper, the effect of Hall current on an unsteady MHD transient three dimensional flow of an electrically conducting viscous incompressible fluid past an impulsively started infinite horizontal porous plate relative to a rotating system has been studied. It is assumed that the entire system rotates with a constant angular velocity about the normal to the plate and a uniform magnetic field is applied along the normal to the plate and directed into the fluid region. The magnetic Reynolds number is assumed to be so small that the induced magnetic field can be neglected. The expressions for the primary and secondary fields and shearing stress at the plate due to primary and secondary velocity fields are obtained in a non-dimensional form. The non-dimensional governing equations of the flow are solved by using the Galerkin FEM. The effects of the physical parameters, such as the Hartmann number (M), rotation parameter (Ω), porosity parameter (K) and Hall parameter (m) on primary and secondary velocities and shearing stresses τx and τy due to primary and secondary velocities are discussed through graphs and tables, and results are physically interpreted.
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 471-483
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kondensator wzorcowy 10 nF z dielektrykiem ceramicznym
10 nF reference capacitor with a ceramic dielectric
Autorzy:
Koszarny, Maciej
Jursza, Jolanta
Szutkowski, Jerzy
Jasiński, Robert
Szterk, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/952615.pdf
Data publikacji:
2018
Wydawca:
Główny Urząd Miar
Tematy:
kondensator
wzorcowanie
efekt Halla
capacitor
calibration
Hall effect
Opis:
W ramach prac badawczo-rozwojowych, w Samodzielnym Laboratorium Elektryczności i Magnetyzmu Głównego Urzędu Miar zaprojektowano, opracowano i wykonano czterozaciskowy kondensator wzorcowy o wartości 10 nF, z dielektrykiem ceramicznym. Kondensator został umieszczony w termostacie z wbudowanym elektronicznym układem sterowania, który zapewnia bardzo precyzyjne utrzymywanie określonej temperatury. Układ sterowania może być zasilany ze stacjonarnego źródła zasilania lub z dodatkowego akumulatora. Opracowany wzorzec charakteryzuje się bardzo dobrą stabilnością wartości pojemności elektrycznej dla danej częstotliwości oraz małą wartością stratności. Wzorzec ten jest niezbędnym elementem dla transferu jednostki miary pojemności elektrycznej z kwantowego efektu Halla.
In Electricity and Magnetism Laboratory of the Central Office of Measures, a four-terminal reference capacitor 10 nF (with a ceramic dielectric) was designed, developed and made. The capacitor has been placed in a thermostat with a built-in electronic control system which can be powered from a stationary power source or from an additional battery. The developed standard is characterized by a very good stability of the capacitance value for a given frequency and a low loss value tan δ. This capacitor is a necessary element for the transfer of the unit of capacitance from the quantum Hall effect.
Źródło:
Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar; 2018, 2 (21); 50-52
2300-8806
Pojawia się w:
Metrologia i Probiernictwo : biuletyn Głównego Urzędu Miar
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Spin Hall Effect in k-Cubed Rashba Model
Autorzy:
Krzyżewska, A.
Dyrdał, A.
Berakdar, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030432.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Tj
72.25.-b
72.25.Mk
73.40.-c
Opis:
Within the Matsubara Green function formalism and linear response theory we considered theoretically the temperature dependences of the spin Hall effect for a two-dimensional gas with an isotropic k-cubed form of the Rashba interaction. We utilize a standard model for treating spin-orbit phenomena in p-doped semiconductor heterostructures and also for an electron gas formed at perovskite oxides interfaces.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 558-560
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 63

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