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Wyświetlanie 1-15 z 17
Tytuł:
Decay of Electric Charge on Corona Discharge Polyethylene
Autorzy:
Zhang, L.
Xu, Z.
Chen, G.
Powiązania:
https://bibliotekanauki.pl/articles/1807998.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.80.-s
81.05.Lg
84.30.Jc
Opis:
In this paper, surface potential decay after corona charge deposition has been investigated for low density polyethylene (LDPE) films. We believe that the three ways of electron charge decay on the surface of insulating polyethylene film is reasonable. The factor of neutralizing with opposite charge in air is negligible, and leakage along insulator surface or through the body is much more important for electron charge decay. Both ways are related with surface voltage of the sample. When the voltage is lower than a critical value, surface leakage contributes most. If the voltage is higher than this value, the electron energy on the surface of the sample exceeds the critical value and it is easy to cross the "deep trap". In this situation, the body leakage is more important, and the decay on the surface of sample speeds. That is why there exists decay curve crossing phenomenon.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 1197-1200
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between atmospheric positive electric charge densities and gas bubble concentrations in the Baltic Sea
Autorzy:
Klusek, Z.
Wiszniewski, A.
Jakacki, J.
Powiązania:
https://bibliotekanauki.pl/articles/48266.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
wind speed
gas bubble
concentration
atmospheric electricity
Baltic Sea
air ion
brackish water
Opis:
Simultaneous measurements of bubble density in the sea subsurface and positive ions in the lower atmosphere were performed in the Baltic Sea in the summer of 1999. Bubbles in two size ranges, around 27 and 100 μm, were measured acoustically. Airborne positive charge was measured with a Gerdien instrument. Observed concentrations of air ions varied from 60 cm−3 up to 600 cm−3. The relative role of bubbles and wind speed on the positive air ion concentrations over the brackish water of the Baltic Sea is discussed. The parameters of a model of a log-log dependence between charge concentration and bubble density are calculated. The correlation functions between time series of concentrations of positive charges over the sea and gas bubbles averaged over a depth range from 0.4 to 4 m and wind speed are presented. There was zero lag between the cross-correlation maxima of charge and bubbles, but there was a phase lag of one and a half hours between charge and wind speed.
Źródło:
Oceanologia; 2004, 46, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jump Mechanism of Electric Charge Transfer in Gallium Arsenide Exposed to Polyenergy Implantation with $H^{+}$ Ions
Autorzy:
Żukowski, P.
Węgierek, P.
Billewicz, P.
Kołtunowicz, T.
Komarov, F.
Powiązania:
https://bibliotekanauki.pl/articles/1504001.pdf
Data publikacji:
2011-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uj
61.72.Cc
72.80.Ey
Opis:
The article presents the experimental results on electric conductivity investigations of gallium arsenide, exposed to polyenergy implantations with $H^{+}$ ions, depending on alternating current frequency (50 Hz ÷ 5 MHz), testing temperature (liquid nitrogen temperature ÷ 373 K) and the temperature of 15 min isochronous annealing (293 ÷ 663 K). It has been found that the obtained dependences σ ($T_{p},$ f) result from a jump mechanism of electric charge transfer between the radiation defects that form in the process of ion implantation. Correlations between annealing of various types of radiation defects and conductivity characteristics σ ($T_{p}$, f) have also been discussed.
Źródło:
Acta Physica Polonica A; 2011, 120, 1; 125-128
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scientific and technical preconditions of electric field application at plants protection
Autorzy:
Inozemtsev, G.
Powiązania:
https://bibliotekanauki.pl/articles/410688.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
pole elektryczne
składniki pokarmowe
uprawy
electric field
electric charge
dispersity
surface tension
nutrient solutions
plants
Opis:
The questions of application of nutrient solutions in an electric field, which contribute to the stimulation of plant growth, reduce electrical and raw losses.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 1; 47-49
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conductors in Cryogenic Environment Used in Power Engineering
Przewodniki w środowisku kriogenicznym stosowane w energetyce
Autorzy:
Diodiu, Lucian
Matei, Aronel
Dragomir, Daniel Alexandru
Isaicu, Octavian
Powiązania:
https://bibliotekanauki.pl/articles/318919.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
środowisko kriogeniczne
azot
ładunek elektryczny
kriogeniczne kable
nadprzewodnictwo
cryogenic environment
nitrogen
electric charge
cryogen cables
superconductivity
Opis:
The tendency to increase the carrying capacity of the electric load in the supply networks can be done in two directions, namely: • the construction of several transmission and distribution lines linking the energy source to the consumer (current trend), having the effect of damaging the environment, or • limiting the construction of transport lines and, implicitly, the destruction of the environment by using technologies and materials capable of carrying a very large amount of electricity.
Tendencja do zwiększania obciążenia elektrycznego w sieciach zasilających może być realizowana w dwóch kierunkach, a mianowicie: budowa kilku linii przesyłowych i dystrybucyjnych łączących źródło energii z konsumentem (obecny trend), powodujących uszkodzenie środowiska, lub ograniczenie budowy linii transportowych i w efekcie ograniczenia zniszczenia środowiska poprzez zastosowanie technologii i urządzeń zdolnych do przenoszenia bardzo dużej ilości energii elektrycznej.
Źródło:
Inżynieria Mineralna; 2019, 21, 1; 69-71
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modified Coulomb law
Autorzy:
Etkin, V. A.
Powiązania:
https://bibliotekanauki.pl/articles/1179008.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Coulomb and Newton laws
attraction and repulsion
dipole representation
electric charge
equilibrium
interaction
polarization
unified field theory
Opis:
A field form of the Coulomb law is proposed, which describes the electric field as a function of the charge density gradient. This law is analogous in form to the modified Newton's law and similarly it reveals the possibility of attraction and repulsion of charges of the same sign as a function of the direction of the gradient of its density, and also the existence of electrostatic equilibrium. As an example of the use of this law, the erroneousness of the assertion that there are no free charges in the volume of the conductor is shown and a new treatment of the polarization processes is given as a result of the redistribution of charges of the same sign in it. A solution is proposed for the stability of atoms and their nuclei on the basis of electrostatic equilibrium and the wave concept of the structure of matter. Experimental confirmations of the proposed concept are presented.
Źródło:
World Scientific News; 2017, 87; 163-174
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of addition of briquettes with dust content into the charge of electric induction furnace on cast iron quality
Autorzy:
Pribulová, A.
Futáš, P.
Baricová, D.
Powiązania:
https://bibliotekanauki.pl/articles/380224.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ochrona środowiska
właściwości mechaniczne
pył odlewniczy
brykiet
elektryczny piec indukcyjny
environmental protection
mechanical properties
foundry dust
briquettes
electric induction furnace
Opis:
Foundry dust from blasting and grinding of castings contain a high amount of iron, ergo it is possible its recycling in foundry process. Dust was compacted by briquetting, two kinds of briquettes were prepared (A contained 95% magnetic part of dust from casting blasting +5% bentonite and B contained 95% mixture of dust from casting grinding and magnetic part of dust from casting blasting + 5% bentonite) and used as a part of charge into the electric induction furnace. It was found that addition of briquettes has had an influence of a chemical composition of cast iron above all on content of sulphur, phosphorus and silicon. It was not reflected in decrease in tensile strength and in microstructure. Yield of metal from briquettes was not lower then 70%.
Źródło:
Archives of Foundry Engineering; 2012, 12, 3; 95-98
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The changing shape of a liquid drop in an electric field
Autorzy:
Jayalal, A. A. S. N.
Wijewardena Gamalath, K. A. I. L.
Powiązania:
https://bibliotekanauki.pl/articles/411766.pdf
Data publikacji:
2012
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
gęstość ładunku powierzchniowego
stała dielektryczna
kąt stożka
napięcie powierzchniowe
minimalne pole elektryczne
surface charge density
dielectric constant
cone angle
surface tension
minimum electric field
Opis:
An approximate extension of the slender body theory was used to determine the static shape of a conically ended dielectric fluid drop in an electric field. Using induced surface charge density, hydrostatic pressure and the surface tension of the liquid with interfacial tension stresses and Maxwell electric stresses, a governing equation was obtained for Spender geometries for the equilibrium configuration and numerically solved for 3D. For an applied electric field, the electric energy on a spherical drop can be maximized in a weak dielectric by increasing the applied electric field. The minimum dielectric constant ratio needed to produce a conical end is 14.5 corresponding to a cone angle 31.25° .There is a sharp increment of the aspect ratio after reaching the threshold value of the applied field strength and the deformation of the fluid drop increases with the increase in dielectric constant of the fluid drop. For a particular dielectric constant ratio, the threshold electric field producing conical interface increases with the increased surface tension of the liquid. The threshold electric field for a water drop is 1.0854×104 units and the corresponding aspect ratio is 15. For the minimum dielectric ratio the cone angle of the drop decreases with applied field making the drop more stable at higher fields.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2012, 3; 24-40
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge transfer scattering in a constant electric field
Autorzy:
Zieliński, Lech
Powiązania:
https://bibliotekanauki.pl/articles/965932.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
We prove the asymptotic completeness of the quantum scattering for a Stark Hamiltonian with a time dependent interaction potential, created by N classical particles moving in a constant electric field.
Źródło:
Colloquium Mathematicum; 1999, 79, 1; 37-61
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
State of charge estimation method for lithium-ion batteries in all-electric ships based on LSTM neural network
Autorzy:
Geng, Pan
Xu, Xiaoyan
Tarasiuk, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1585036.pdf
Data publikacji:
2020
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
all-electric ships
lithium-ion battery
state of charge
neural network
Opis:
All-electric ships (AES) are considered an effective solution for reducing greenhouse gas emissions as they are a platform to use clean energy sources such as lithium-ion batteries, fuel cells and solar cells instead of fossil fuel. Even though these batteries are a promising alternative, the accuracy of the battery state of charge (SOC) estimation is a critical factor for their safe and reliable operation. The SOC is a key indicator of battery residual capacity. Its estimation can effectively prevent battery over-discharge and over-charge. Next, this enables reliable estimation of the operation time of fully electric ferries, where little time is spent at the harbour, with limited time available for charging. Thus, battery management systems are essential. This paper presents a neural network model of battery SOC estimation, using a long short-term memory (LSTM) recurrent neural network (RNN) as a method for accurate estimation of the SOC in lithium-ion batteries. The current, voltage and surface temperature of the batteries are used as the inputs of the neural network. The influence of different numbers of neurons in the neural network’s hidden layer on the estimation error is analysed, and the estimation error of the neural network under different training times is compared. In addition, the hidden layer is varied from 1 to 3 layers of the LSTM nucleus and the SOC estimation error is analysed. The results show that the maximum absolute SOC estimation error of the LSTM RNN is 1.96% and the root mean square error is 0.986%, which validates the feasibility of the method.
Źródło:
Polish Maritime Research; 2020, 3; 100-108
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electric and magnetic field of different transpositions of overhead power line
Autorzy:
Deltuva, R.
Lukočius, R.
Powiązania:
https://bibliotekanauki.pl/articles/140665.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric and magnetic field strength
linear charge density
electric and magnetic
flux density
electric and magnetic field, power line
transposition
Opis:
In Lithuanian and Polish electric power supply systems, the power transmission lines of 400 kV voltage represent one of the most potential sources of electric and magnetic fields generation. The 400 kV double-circuit overhead power transmission line and its surrounding environment were herby described and simulated through Finite Element Method using COMSOL Multiphysic software package. This study includes magnetic and electric field calculations. The study shows that the values of magnetic field strength and electric field strength present in the vicinity of a 400 kV overhead power transmission line tend to exceed limit values established in the Normative. Measurements are suggested to be taken for the purpose of finding maximum values of magnetic and electric field strength. To reduce these values, it is recommended to increase the height of supports, and restrict human personal and economic activities.
Źródło:
Archives of Electrical Engineering; 2017, 66, 3; 595-605
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comprehensive Analysis of Pre-Charge Sequence in Automotive Battery Systems
Autorzy:
Ozguc, Murat Kubilay
Ipek, Eymen
Aras, Kadir
Erhan, Koray
Powiązania:
https://bibliotekanauki.pl/articles/136243.pdf
Data publikacji:
2020
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
electric vehicles
battery systems
li-ion
charging
semiconductor
Opis:
Electric vehicles (EV) have brought promising technologies for future mobility solutions. As one of the key components of EVs, battery systems have fundamental functions which disconnect the battery during parking and in case of failure. To provide a safe system, specialized high voltage (HV) electromechanical switches are used to perform these major functions such as switch on, switch off or pre-charging. Due to these components can be easily damaged, expensive, heavy and bulky, a solution based on pure semiconductors may be desired to accomplish these operations. Many studies were exhibited on EV battery systems regarding developing solid-state systems for HV switchgear. Developing technology on semiconductor devices allows to make a safety concept based on only solid-state components. This study presents a comprehensive analysis of pre-charge sequences between conventional and semiconductor switchgear to be used in electric vehicle battery systems. Spice simulations are presented to investigate advantages and drawbacks of these systems.
Źródło:
Transactions on Environment and Electrical Engineering; 2020, 4, 1; 1-6
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of cooperation of a two-stroke combustion engine with an electric machine in the cogeneration system
Problematyka współpracy dwusuwowego silnika spalinowego z maszyną elektryczną w układzie kogeneracyjnym
Autorzy:
Marek, W.
Powiązania:
https://bibliotekanauki.pl/articles/263657.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
dwusuwowy silnik spalinowy
maszyna elektryczna
współpraca
wymiana ładunku
charge exchange
cooperation
electric machine
two-stroke combustion engine
Opis:
The paper presents the problem of charge formation process and charge exchange in a two-stroke SI engine. This problem is connected with the application of two-stroke engine with pneumatic fuel injection (according to the conception of Prof. St. Jarnuszkiewicz) in cogeneration systems. There are presented the results of simulating and laboratory investigation connected with the cooperation of combustion engine and electric machine. The machine was equipped with an electronic controller that enables electric machine protection against overload by load current limitation, charge current limitation, output voltage limitation to full battery charge voltage. Another controller tasks are: protection against battery - generator reverse current, generator protection against too high temperature, keeping required voltages, and currents apart from ambient temperature. The problems of process of fuel charge exchange was presented as the main question. It was considered from the one hand as an energetic demand of arrangement extorting, and from the other hand as obtainments of minimise exhaust gases toxic components amount.
Referat obejmuje zagadnienia kształtowania procesu wymiany ładunku w dwusuwowym silniku ZI. Problematykę tę powiązano z możliwością aplikacji silnika dwusuwowego z pneumatycznym wtryskiem paliwa (wg koncepcji prof. St. Jamuszkiewicza) w układach kogeneracyjnych. Zaprezentowano wyniki badań symulacyjnych i laboratoryjnych, związanych z zagadnieniem współpracy silnika spalinowego i maszyny elektrycznej, wyposażonej w elektroniczny regulator napięcia prądnicy, umożliwiający: zabezpieczenie maszyny przed przeciążeniem poprzez ograniczenie wartości prądu obciążenia, ograniczenie prądu do wartości maksymalnej prądu ładowania, ograniczenie napięcia wyjściowego do wartości napięcia końcowego naładowania baterii akumulatorów, zabezpieczenie przed przepływem prądu zwrotnego od baterii akumulatorów do prądnicy, ochronę prądnicy przed przekroczeniem temperatury dopuszczalnej, utrzymywanie zadanych wartości napięć i prądów niezależnie od temperatury otoczenia. Jako główne zagadnienie zaprezentowano problematykę procesu wymiany ładunku, w której uwzględniono z jednej strony energetyczne zapotrzebowanie układu wymuszającego, z drugiej zaś strony zapewnienie minimalizacji zawartości toksycznych składników w spalinach.
Źródło:
Archiwum Motoryzacji; 2008, 1; 79-90
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
LO-Phonon Band Filling by Means of Charge Carriers Accelerated in Electric Fields
Autorzy:
Raguotis, R.
Brazis, R.
Powiązania:
https://bibliotekanauki.pl/articles/1506223.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.45.+h
78.30.-j
42.55.-f
72.10.-d
72.20.Ht
Opis:
Electron and phonon distribution in momentum space is modeled using Monte Carlo method. Calculated LO phonon distribution in zinc-blende GaN deviates dramatically from the thermal equilibrium (Planck) function, and well coincides with the phonon number elucidated from the existing anti-Stokes Raman scattering experiments.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 247-249
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A self-scheduling strategy of virtual power plant with electric vehicles considering margin indexes
Autorzy:
Jiao, Fengshun
Deng, Yongsheng
Li, Duo
Wei, Bo
Yue, Chengyan
Cheng, Meng
Zhang, Yapeng
Zhang, Jiarui
Powiązania:
https://bibliotekanauki.pl/articles/949880.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric vehicle (EV)
response time margin (RTM)
scheduling strategy
state of charge margin (SOCM)
virtual power plant (VPP)
Opis:
From the perspective of a virtual power plant (VPP) with electric vehicles (EVs), a self-scheduling strategy considering the response time margin (RTM) and state of charge margin (SOCM) is proposed. Firstly, considering the response state of the state of charge (SOC) and charge-discharge state of EVs, a VPP based response capacity determination model of EVs is established. Then, RTM and SOCM indexes are introduced on the basis of the power system scheduling target and the EV users’ traveling demands. The RTM and SOCM indices are calculated and then are used to generate a priority sequence of responsive EVs for the VPP. In the process of the scheduling period and rolling iteration, the scheduling schemes of the EVs in the VPP for multiple time periods are determined. Finally, the VPP self-scheduling strategy is validated by taking an VPP containing three kinds of EV users as an example. Simulation results show that with the proposed strategy, the VPP is able to respond to the scheduling power from the power system, while ensuring the traveling demands of the EV users at the same time.
Źródło:
Archives of Electrical Engineering; 2020, 69, 4; 907-920
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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