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    Wyświetlanie 1-24 z 24
    Tytuł:
    Different Ignition Responses of Powdery and Bulky 1,3,5-Triamino-2,4,6-trinitrobenzene (TATB) Based Polymer-bonded Explosives under Ultra-high Voltage Electrostatic Discharge
    Autorzy:
    Lyu, Z.
    Long, X.
    Li, Z.
    Dai, X.
    Deng, C.
    He, S.
    Li, M.
    Yao, K.
    Wen, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/358240.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    electrostatic spark sensitivity
    ultra-high voltage electrostatic discharge
    thermal effect
    electric field effect
    Opis:
    The electric spark induced ignition mechanism for explosives needs further study. The ignition of powdery and bulky TATB by electrostatic discharge (ESD) was investigated. Up to 200 kV ultra-high voltage ESD was applied to powdery and bulky explosives of two TATB-based polymer-bonded explosives (named PBX-1 and PBX-2). The results showed that the spark sensitivities of powdery and bulky explosives are extremely different for the same formulation. The 50% ignition voltages of powdery PBX-1 and PBX-2 were 10.8 kV and 8.5 kV, respectively, while the values for the bulky samples (tablets) were not less than 200 kV. Both heat and the electric field can be transmitted into the powdery samples, on the other hand only the electric field can be transmitted into the bulk samples. The electric field has a smaller contribution while the heat has a larger contribution to the ignition during an ESD, i.e., the thermal effect plays a main role in the ignition process. Our experimental results are in good agreement with recent results calculated by density functional theory.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 2; 283-298
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Field Prediction for a Human Body-Electric Machine System
    Autorzy:
    Ioannides, M. G.
    Papadopoulos, P. J.
    Dimitropoulou, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/90184.pdf
    Data publikacji:
    2004
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    ELF EMF
    electric field effect
    electric machines
    human
    risk factor
    czynniki ryzyka
    pole elektryczne
    elektryczność
    maszyny
    prąd elektryczny
    zagrożenia zdrowia
    Opis:
    A system consisting of an electric machine and a human body is studied and the resulting electric field is predicted. A 3-phase induction machine operating at full load is modeled considering its geometry, windings, and materials. A human model is also constructed approximating its geometry and the electric properties of tissues. Using the finite element technique the electric field distribution in the human body is determined for a distance of 1 and 5 m from the machine and its effects are studied. Particularly, electric field potential variations are determined at specific points inside the human body and for these points the electric field intensity is computed and compared to the limit values for exposure according to international standards.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2004, 10, 1; 87-100
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of electric field on dispersion of a solute in an MHD flow through a vertical channel with and without chemical reaction
    Autorzy:
    Umavathi, J. C.
    Kumar, J. P.
    Gorla, R. S. R.
    Gireesha, B. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/265686.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    dyspersja Taylora
    magnetohydrodynamika
    reakcja chemiczna
    Taylor dispersion
    immiscible fluids
    conducting fluid
    MHD
    chemical reaction
    Opis:
    The longitudinal dispersion of a solute between two parallel plates filled with two immiscible electrically conducting fluids is analyzed using Taylor’s model. The fluids in both the regions are incompressible and the transport properties are assumed to be constant. The channel walls are assumed to be electrically insulating. Separate solutions are matched at the interface using suitable matching conditions. The flow is accompanied by an irreversible first-order chemical reaction. The effects of the viscosity ratio, pressure gradient and Hartman number on the effective Taylor dispersion coefficient and volumetric flow rate for an open and short circuit are drawn in the absence and in the presence of chemical reactions. As the Hartman number increases the effective Taylor diffusion coefficient decreases for both open and short circuits. When the magnetic field remains constant, the numerical results show that for homogeneous and heterogeneous reactions, the effective Taylor diffusion coefficient decreases with an increase in the reaction rate constant for both open and short circuits.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 683-711
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ impulsowego pola elektrycznego na straty przechowalnicze bulw ziemniaka
    Effect of impulse eclectic field on storage losses of potato tubers
    Autorzy:
    Marks, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/289806.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    impulsowe pole elektryczne
    straty przechowalnicze
    odmiana
    przechowywanie
    bulwa
    czas ekspozycji
    natężenie prądu
    impulse magnetic field
    storage losses
    variety
    tuber storage
    exposure time
    electric current intensity
    Opis:
    Celem pracy było określenie wpływu impulsowego pola elektrycznego na trwałość przechowalniczą bulw ziemniaka. Bulwy ziemniaka poddano działaniu pola elektrycznego o natężeniu 24 W/m. 30 kV/m, 40 Mini 60 kV/m, i czasach ekspozycji 100 µs, 300 µs, 600 µs. Do badań przyjęto trzy odmiany ziemniaka: Drop, lrga, Salto. Badania przeprowadzono w latach 2002-2004. Trwałość przechowalniczą określono wskaźnikami strat całkowitych, ubytków naturalnych, strat w wyniku kiełkowania i strat chorobowych podczas długotrwałego okresu przechowywania (6 miesięcy). Zastosowanie impulsowego pola elektrycznego dało pozytywny elekt w postaci zmniejszenia strat całkowitych i strat chorobowych oraz brak widocznego wpływu na proces kiełkowania bulw i ubytki naturalne.
    The aim of this study was to asses the effect of impulse electric field on the storage life of potato tubers. Potato tubers were subjected to an electric field of 24 kV/m, 30 W/m, 40 Min and 60 kV/m intensity and 100 µs, 300 µs, 600 µs exposure times. Three potato varieties: Drop. Irga. and Salto were studied. The study was conducted in 2002-2004. The storage life was assessed according to the ratio of total losses, natural losses, sprouting losses and disease losses during a long storage period (6 months). The application of electric field had a positive effect as it decreased total and disease losses and had no visible influence on tuber sprouting and natural losses.
    Źródło:
    Inżynieria Rolnicza; 2005, R. 9, nr 10, 10; 303-309
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ pola elektrycznego na tarcie wybranych elastomerów po stali w środowisku silnikowych olejów bazowych
    The effect of an electric field on the friction of selected elastomers against steal in a motor base oil’s environment
    Autorzy:
    Gajewski, J. B.
    Głogowski, M. J.
    Wieleba, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/188744.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    pin-on-disc
    tarcie
    pole elektryczne
    olej bazowy
    elastomer
    dodatek uszlachetniający
    friction
    electric field
    base oil
    additive
    Opis:
    W artykule przedstawiono wyniki badań nad wpływem zewnętrznego stałego pola elektrycznego na współczynnik tarcia wybranych elastomerów podczas tarcia o powierzchnię stalową na stanowisku „pin-on-disc”. W celach porównawczych prowadzono także badania bez zewnętrznego pola elektrycznego. W badanym układzie stosowano próbki trzech różnych elastomerów, syntetyczne oleje bazowe PAG i PAO oraz ich mieszaniny z dodatkami uszlachetniającymi – przeciwzatarciowym (ZDDP) i modyfikatorem tarcia (IRGALUBE F10A), a także stalowy przeciwelement.Wybrane do badań elastomery stosowane są do wytwarzania uszczelnień wargowych. Stwierdzono, że zewnętrzne stałe pole elektryczne istotnie wpływa na współczynnik tarcia, a wielkość tego wpływu zależy od rodzaju elastomeru oraz oleju bazowego i jego mieszanin z dodatkami uszlachetniającymi.
    The paper presents the experimental results of research on the effect of an external DC electric field on the coefficient of friction of selected elastomers during their rubbing against a steel surface in the “pin–on– disc” experimental set-up. The tests were also carried out without any external DC electric field to compare the coefficients of friction obtained in both cases. In the tests, three different elastomers were used: pure PAG and PAO synthetic base oils and their blends with two additives – antiwear (ZDDP) and friction modifier (IRGALUBE F10A), and a steel counterface. The elastomers selected and used in the tests are those applied to the manufacture of rotary lip seals. It was found that the external DC electric field exerts a significant effect on the coefficient of friction, which in turn depends on the type of elastomer and the base oil and its blends with the additives used.
    Źródło:
    Tribologia; 2015, 3; 21-31
    0208-7774
    Pojawia się w:
    Tribologia
    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:
    Crystal electric field parameters determination for R2Fe14B compounds based on Yamada - Kato model
    Autorzy:
    Bogacz, B. F.
    Pędziwiatr, A. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/147342.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal electric field parameters
    model Yamada-Kato
    Mössbauer effect
    permanent magnet materials
    spin reorientation
    Opis:
    Semi-empirical model developed by Yamada-Kato enables calculation of magnetic spin directions for R2Fe14B compounds, based on minimization of free energy, and - in further steps - determination of spin reorientation temperatures for transitions from basal plane to axial easy magnetization direction. In our study, this model has been successfully used to determine crystal field and exchange field parameters for Er2-xCexFe14B compounds based on spin reorientation temperatures obtained experimentally from Mössbauer measurements.
    Źródło:
    Nukleonika; 2013, 58, 1; 31-33
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Return Electrode Position on Induced Electric Fields for Electrical Stimulation of Retinal Ganglion Cells
    Autorzy:
    Celik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031744.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    electrical stimulation
    electric field
    current density
    temperature
    retina
    visual prostheses
    Opis:
    Age-related macular degeneration and retinitis pigmentosa are the most countered eye diseases that damage photoreceptors and cause to lose the visual sense. To regain the visual sense, studies are focused on the electrical stimulation of nerve cells remain intact. The electrical stimulation is carried out with the electrode arrays that include a certain number of stimulation electrodes and a common return electrode. In this study, the retinal stimulation is modelled using a computational model to investigate stimulation performance depending on the return electrode position and its geometrical properties. Stimulation induced electric field, current density and temperature over the retinal tissue are examined. It is seen that closer placement of return electrode and stimulation electrodes causes high electric field intensity and current density between electrodes, which is quite risky for long term chronic implementation by the reason of the increase in the temperature beyond the safe limits. It is concluded that there is an indispensability for the distances, three to five times of the electrode diameter, between electrodes to avoid electrode corrosion and tissue damage.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 493-495
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Field Control of Magnetic Coupling in a Double Quantum Dot System and Related Parasitic Electric Dipole Effect
    Autorzy:
    Bak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1534865.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    73.90.+f
    75.75.Lf
    Opis:
    We prove that tunable magnetic interaction in a two-qubit spintronic device can arise due to the mutual competition of the Ruderman-Kittel-Kasuya-Yosida and double-exchange interactions. The values of induced electric dipoles (which arise when magnetic coupling is manipulated by the electric field) are calculated. We show that the dissipation of the energy during logic operations due to these parasitic dipoles can destroy quantum coherence in any quantum dot system.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 957-958
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution growth of ZnO sub-micro rods enhanced by electric field
    Autorzy:
    Pisarkiewicz, T.
    Kenig, T.
    Rydosz, A.
    Maziarz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200101.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanowires
    electrodeposition
    dielectrophoretic effect
    zinc oxide
    Opis:
    Recently the one-dimensional ZnO nanostructures have attracted much attention in gas sensor applications owing to their increased role of the surface. The authors have obtained ZnO rods of sub-micron size using the solution growth method with the growth temperature below 100.C. Investigations indicate that the rods have a well-defined hexagonal morphology and a wurtzite structure. The best uniformity and alignment of the sub-micron crystals was however obtained when electrodeposition from aqueous solution was developed. Sizes of these rods depend on the growth parameters. Moreover electrodeposition leads to a faster growth rate of ZnO sub-micron rods (2 hrs) as compared to the growth from solution (8 hrs). After electrodeposition the rods can be easily reoriented in external electric fields by using substrates with electrodes of appropriate geometry and configuration (dielectrophoretic effect). This enables the preparation of samples which can be used in gas sensor technology.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 425-428
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of External Electric Field on Time of Nonlinear Optical Reorientational Effect in Nematics
    Autorzy:
    Bajdecki, W. K.
    Karpierz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035684.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    42.70.Df
    Opis:
    Nonlinear reorientation phenomena in nematic liquid crystals cause extremely large refractive index changes. However, this effect is relatively slow and the determination of the time necessary to appearing or disappearing of the nonlinear effect is an important issue. In this work we present measurements of the time of increasing the nematics reorientation induced by the light beam passing through the liquid crystalline layer. The influence of external low-frequency electric field suppressing reorientation is also reported. The obtained results describing relations between time and optical power of light as well as between time and external electric field intensity are in good agreement with theory.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 2-3; 187-193
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of polarization molecules reagents of the burning reaction on the efficiency of equipment for thermogeneration
    Autorzy:
    Kovalyshyn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/411199.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    energy efficiency
    burning
    electric field
    high voltage
    activation
    polarization
    Opis:
    The aspects of physical and chemical nature of oxidizing-reduction processes of burning were investigated. The communication of efficiency of fuel equipments with polarizing and activating of molecules-reagents was exposed. Application of molecules electro-activation for optimization of the chemical reactions at burning passed at incineration of gaseous hydrocarbon fuels in the oxidizing air environment was grounded experimentally.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2013, 2, 2; 31-35
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of low-frequency electric field screening on motility of human sperm
    Autorzy:
    Górski, R.
    Kotwicka, M.
    Skibińska, I.
    Jendraszak, M.
    Wosiński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2085910.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    human spermatozoa
    male infertility
    50 Hz EMF – 50 Hz electromagnetic field
    dielectric screen
    ADR Technology®
    Opis:
    Introduction. The human body is constantly exposed to an extremely low electromagnetic field (ELF-EMF), in particular at 50 Hz, emitted by power lines, domestic distribution lines, electrical appliances, etc. It is assumed that the increase in electromagnetic exposure may cause adverse effects upon human health, as well as raising concerns regarding the impact on human fertility. Objective. The aim of this in vitro study was to investigate the influence of ELF-EMF with a frequency of 50 Hz on the motility of human sperm. At the same time, the effectiveness of the dielectric screen constructed by ADR Technology® in absorbing the emitted radiation was examined. Materials and method. Semen samples of 20 patients were exposed to the influence of an extremely low electromagnetic field. After 5, 15 and 30 min., spermatozoa motility was analysed using a computer-assisted spermatozoa motility analysis system. The following sperm motility parameters were examined: 1) velocity straight linear motility; 2) cross-beat frequency; 3) lateral head displacement; 4) homogeneity of progressive motility velocity. Results. It was found that the ELF-EMF presented a negative effect on the motility of human spermatozoa. A significant decrease in spermatozoa motility speed and a significant increase in lateral head deviation values were observed under the influence of the electromagnetic field. ELF-EMF did not show an effect on either lateral head displacement or homogeneity of progressive motility velocity. Conclusions. A positive effect of the dielectric screen ADR Technology® was found. This effect compensated spermatozoa motility changes induced with ELF-EMF.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2020, 27, 3; 427-434
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    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:
    The effect of magnetic field on the efficiency of a silicon solar cell under an intense light concentration
    Autorzy:
    Zoungrana, M.
    Zerbo, I.
    Soro, B.
    Savadogo, M.
    Tiedrebeogo, S.
    Bathiebo, D. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/102700.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    conversion efficiency
    electric power
    fill factor
    light concentration
    magnetic field
    optimal charge load
    Opis:
    This work put in evidence, magnetic field effect the electrical parameters of a silicon solar cell illuminated by an intense light concentration: external load electric power, conversion efficiency, fill factor, external optimal charge load. Due to the high photogeneration of a carrier in intense light illumination mode, in addition of magnetic field, we took into account the carrier gradient electric field in the base of the solar cell. Taking into account this electric field and the applied magnetic field in our model led to new analytical expressions of the continuity equation, the photocurrent and the photovoltage. In this work, we used the electric power curves versus junction dynamic velocity (Sj) to determine, according to magnetic field, the maximum electric power Pelmax and we calculate the solar cell conversion efficiency (η). We also used the J-V characteristics to determine the solar cell short circuit density current (Jcc) and the open circuit voltage (Vco) under magnetic field and we calculate the fill factor (FF). Finally, we used simultaneously the J-V characteristics and equipower curves to determine the optimal external load resistance. The results of this study have showed that the maximum electric power and the conversion efficiency are higher than those of monofacial and bifacial silicon solar cells illuminated by conventional light but they decreased with the increase of magnetic field.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 2; 133-138
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Epitaxial Layer Thickness on Built-in Electric Field in Region of AlGaAs/SI-GaAs Interface: A Photoreflectance Study
    Autorzy:
    Ochalski, T. J.
    Żuk, J.
    Vlasukova, L. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968408.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Fd
    78.20.-e
    Opis:
    We present a study of detailed line shapes of photoreflectance spectra for Al$\text{}_{0.3}$Ga$\text{}_{0.7}$ As/SI-GaAs epitaxial layers grown by MBE. All measurements were performed at 80 K under UHV conditions with a special care for the samples surface quality. A set of the photoreflectance spectra was collected for photon energies close to the GaAs and Al$\text{}_{0.3}$Ga$\text{}_{0.7}$As band gaps (E$\text{}_{0}$). The photoreflectance spectra originated in the vicinity of the Al$\text{}_{0.3}$Ga$\text{}_{0.7}$As/SI-GaAs interface were analyzed using the complex Airy function model of Franz-Keldysh oscillations. To examine the effect of the epitaxial layer thickness on parameters characterizing the interface, a step-by-step chemical etching was applied for stripping the top layers. The built-in electric field intensity, field inhomogeneity and phenomenological broadening parameter for interface regions were determined as a function of the epilayer thickness.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 935-939
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of non-stationary temperature field generated by a shaftless screw conveyor heated by Joule-Lenz effect
    Autorzy:
    Ledakowicz, Stanisław
    Piddubniak, Olexa
    Powiązania:
    https://bibliotekanauki.pl/articles/2086780.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    screw reactor
    rotating shaftless screw
    electric heating
    non-stationary temperature field
    analytico-numerical method
    reaktor śrubowy
    obrotowa śruba bezwałowa
    ogrzewanie elektryczne
    niestacjonarne pole temperatury
    metoda analityczno-numeryczna
    Opis:
    The non-stationary problem of temperature distribution in a circular cylindrical channel of infinite length filled with a homogeneous biomass material moving with a constant velocity in the axial direction was investigated. The heat source was a shaftless helical screw (or auger), which was heated with an electric current due to the Joule–Lenz effect and rotated uniformly around the axis of symmetry of the channel. Similar problems arise in the thermal processing of biomaterials using screw conveyor in pyrolysis and mass sterilization and pasteurization of food products. The problem is solved using the expansion of given and required functions in Fourier series over angular coordinate and integral Fourier and Laplace transforms over axial coordinate and time, respectively. As a result, the temperature field is obtained as the sum of two components, one of which, global, is proportional to time, and the other, which forms the microstructure of the temperature profile, is given by Fourier–Bessel series. The coefficients of the series are determined by the integrals calculated using the Romberg method. Based on the numerical calculations, the analysis of the space-time microstructure of the temperature field in the canal was performed. A significant dependence of the features of this microstructure on the geometric, kinematic and thermodynamic characteristics of the filling biomass and the screw was revealed.
    Źródło:
    Chemical and Process Engineering; 2021, 42, 2; 119--137
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boundary effects on electrothermal convection in a dielectric fluid layer
    Autorzy:
    Ravisha, M.
    Raghunatha, K. R.
    Mamatha, A. L.
    Shivakumara, I. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240648.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    boundary effect
    dielectric fluid
    AC electric field
    thermal convection
    konwekcja termiczna
    płyn dielektryczny
    warunki brzegowe
    Opis:
    The instability characteristics of a dielectric fluid layer heated from below under the influence of a uniform vertical alternating current (AC) electric field is analyzed for different types of electric potential (constant electric potential/ electric current), velocity (rigid/free) and temperature boundary conditions (constant temperature/heat flux or a mixed condition at the upper boundary). The resulting eigenvalue problem is solved numerically using the shooting method for various boundary conditions and the solution is also found in a simple closed form when the perturbation heat flux is zero at the boundaries. The possibility of a more precise control of electrothermal convection (ETC) through various boundary conditions is emphasized. The effect of increasing AC electric Rayleigh number is to hasten while that of Biot number is to delay the onset of ETC. The system is more stable for rigid-rigid boundaries when compared to rigid-free and least stable for free-free boundaries. The change of electric potential boundary condition at the upper boundary from constant electric potential to constant electric current is found to instill more stability on the system.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 1; 3-19
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A simple semi-analytical model for the Kink effect for the intrinsic n-channel polysilico thin film transistors
    Autorzy:
    Siddiqui, M. J.
    Qureshi, S.
    Alshariff, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/378435.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
    Tematy:
    cienkie warstwy
    tranzystory
    jonizacja
    pole elektryczne
    model analityczny
    efekt Kinka
    polisilikon
    thin films
    tranzistors
    ionization
    electric field
    analylical model
    Kink effect
    polysilicon
    Opis:
    In order to improve the modeling of Polysilicon thin film transistors (Poly-Si-TFTs) a precise evaluation of the excess current due to impact ionization is needed. In this paper we have proposed a simple model for the excess current resulting from the impact ionization occurring at high drain biases. Model is based on the estimation of the electric field in the saturated part of the channel. The electric field in the saturated region is obtained by the solution of the two- dimensional Poisson's equation. The model is semi-analytical and uses only one fitting parameter which is desirable for circuit simulation. The simulation results with the developed impact ionization current model are in excellent agreement with the available experimental output characteristics of the intrinsic n-channel Poly-Si-TFTs.
    Źródło:
    Electron Technology : Internet Journal; 2007, 39, 1; 1-4
    1897-2381
    Pojawia się w:
    Electron Technology : Internet Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of pulsed electric field (PEF) on mass transfer and quality parameters of osmodehydrated fruits – a review
    Wpływ pulsacyjnego pola elektrycznego (PEF) na wymianę masy i jakość owoców odwodnionych osmotycznie - przegląd badań
    Autorzy:
    Tylewicz, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/5303.pdf
    Data publikacji:
    2017
    Wydawca:
    Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
    Tematy:
    fruit
    quality
    dehydration
    osmotic dehydration
    mass transfer
    pulsed electrical field
    food product
    moisture
    minimally processed product
    Źródło:
    Nauki Inżynierskie i Technologie; 2017, 4(27)
    2449-9773
    2080-5985
    Pojawia się w:
    Nauki Inżynierskie i Technologie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Różnorodność składu betonu i jego wpływ na natężenie pola elektrycznego
    The variety of concrete components and its effect on the on the electric field intensity
    Autorzy:
    Choroszucho, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/378359.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    natężenie pola elektrycznego
    beton
    parametry elektryczne betonu
    względna przenikalność elektryczna
    konduktywność
    Opis:
    Celem artykułu jest dokładna analiza wpływu ściany wykonanej z betonu zwykłego na wartości natężenia pola elektrycznego. Rozpatrywano dwa warianty ścian o różnej grubości. W analizie uwzględniono zmienność parametrów elektrycznych betonu (względna przenikalność elektryczna oraz konduktywność), które są używane w dostępnej literaturze. Wartości natężenia pola elektrycznego zostały wyznaczone przy dwóch częstotliwościach stosowanych w komunikacji bezprzewodowej (f = 2,4 GHz oraz f = 5 GHz). Różnice w natężeniu pola elektrycznego wynikające z dwukrotnego zwiększenia grubości ściany otrzymane przy tej samej częstotliwości zostały opisane za pomocą współczynnika st1. Do analizy wykorzystano numeryczną metodę różnic skończonych w dziedzinie czasu (FDTD).
    The aim of the article is detailed analyze the influence of a wall made of ordinary concrete on the values of the electric field intensity. Two variants of walls of different thickness were considered. The analysis includes the variability of electrical parameters of concrete (relative electrical permittivity and conductivity), which are used in the available literature. The values of the electric field intensity were determined at two frequencies used in wireless communication system (f=2.4 GHz and f=5 GHz). The differences in the intensity of the electric field resulting from the double increase in the wall thickness obtained at the same frequency have been described using the coefficient st1. For the analysis all cases, the finite difference time domain method (FDTD) was used.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 93; 193-204
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical 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:
    Wpływ pulsacyjnego pola elektrycznego na akumulację selenu w drożdżach Rodothorula rubra
    The effect of pulsed electric field on selenium incorporation in the yeast Rodothorula rubra
    Autorzy:
    Jamroz, J
    Pankiewicz, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/9730080.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    pole elektryczne pulsacyjne zob.pulsacyjne pole elektryczne
    pulsacyjne pole elektryczne
    akumulacja
    Rodothorula rubra
    selen
    wzbogacanie drozdzy
    stezenie selenu
    drozdze
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura; 2004, 59, 4; 2053-2059
    0365-1118
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio E. Agricultura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of rotation on the onset of electrohydrodynamic instability of an elastico-viscous dielectric fluid layer
    Autorzy:
    Rana, G. C.
    Chand, R.
    Sharma, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/199843.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Walters' fluid
    (model B’ fluid
    rotation
    AC electric field
    electrohydrodynamics
    viscosity
    viscoelasticity
    rotacja
    pole elektryczne
    elektrohydrodynamika
    lepkość
    lepkosprężystość
    płyn Waltersa
    elasto-lepki płyn Waltersa
    Opis:
    In this paper the combined effect of uniform rotation and AC electric field on the onset of instability in a horizontal layer of an elastico-viscous fluid stimulated by the dielectrophoretic force due to the variation of dielectric constant with temperature is studied. Walters’ (model B’) fluid model is used to describe rheological behaviour of an elastico-viscous fluid. The onset criterions for stationary and oscillatory convection are derived for the case of free-free boundaries. It is observed that Walters’ (model B’) fluid behaves like an ordinary Newtonian fluid and rotation has stabilizing influence whereas AC electric field has destabilizing influence on the stability of the system. The necessary condition for the occurrence of oscillatory convection is also obtained. The present results are in good agreement with the earlier published results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 143-149
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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