Nonlinear whistler wave – electron interaction in the presence of direct current electric fields

1985 ◽  
Vol 63 (4) ◽  
pp. 479-482
Author(s):  
I. M. L. Das ◽  
R. P. Singh
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Direct Current ◽  
Relative Phase ◽  
Finite Amplitude ◽  
Angular Frequency ◽  
Whistler Wave ◽  
Electron Interaction ◽  
Direct Current Electric Field ◽  
Current Electric Field

The nonlinear interaction between an electron and a whistler wave propagating in a magnetoplasma has been studied and expressions for the resonance velocity, equilibrium relative phase angle, and the angular frequency of amplitude oscillations have been derived, taking into account the finite amplitude of the whistler wave, direct current electric field, and medium inhomogeneity. The parallel electric field and inhomogeneity cause detrapping of the particles.

scholarly journals Comparative analysis the performance of electrochemical water softening between high frequency electric fields and direct current electric fields based on orthogonal experimental methods

2021 ◽  
Vol 83 (7) ◽  
pp. 1677-1690
Author(s):  
Wei Lin ◽  
Zhonghao Wang ◽  
Wei Wang ◽  
Qi Chen ◽  
Jianmin Xu ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Direct Current ◽  
High Frequency ◽  
Feed Concentration ◽  
Water Softening ◽  
Direct Current Electric Field ◽  
High Frequency Electric Field ◽  
Hardness Removal ◽  
Current Electric Field

Abstract Electrochemical water softening has been widely used in industrial circulating cooling water systems; however, their low deposition efficiency is the main drawback that limits usage in medium to large enterprises. In this work, the effect of different parameters on the hardness removal efficiency and energy consumption of the electrochemical water softening system is experimentally studied, and the performance of water softening applied by high frequency electric fields and direct current electric fields are comparative analyzed. The impact factors of the electrochemical water softening system are as follows: initial feed concentration of solute, magnitude of voltage, inter-electrode distance, area of cathode and frequency of power supply. To improve the analysis efficiency, the L25 (55) orthogonal table is used to investigate the five different factors at five levels. The experimental results are shown that the initial feed concentration of solute is the most significant factor affecting the hardness removal efficiency. The optimal combination for water softening in the group applied by high frequency electric field and direct current electric field are A3B2C1D4E3 and A2B5C3D1 respectively. The energy utilization of the device applied by high frequency electric field is 3.2 times that applied by direct current electric field. The practice shows that direct current electric fields have a better softening effect, and are is more suitable for scaling ion removal. Particle image velocimetry (PIV) was used to observe the flow field induced by the electrolysis and found that the vertical and horizontal velocities of the flow field at low voltage are conducive to the migration of scaled ions to the cathode, and then the electrolytic reaction and deposition reaction synergy effect is the optimal.

The influence of alternating current and direct current electric fields on the rheological behavior of electrorheological fluids with particles of the different crystalline structure

2019 ◽  
Vol 31 (2) ◽  
pp. 277-287
Author(s):  
Evguenia Korobko ◽  
Leonid Makhnach ◽  
Zoya Novikova ◽  
Inga Kharlamova ◽  
Katya Novik
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Direct Current ◽  
Rheological Behavior ◽  
Electrorheological Fluids ◽  
Dielectric Characteristics ◽  
Direct Current Electric Field ◽  
Alternating Electric Fields ◽  
Influence Of Temperature On ◽  
Current Electric Field

The rheological behavior of electrorheological fluids with dispersed fillers whose particles have different crystalline structures is investigated in direct and alternating electric fields. The dielectric characteristics of the materials were measured and the influence of the strength, frequency, and shape of the signal of electric field was investigated, and the influence of temperature on the shear stress in electrorheological fluids was estimated in direct current electric field.

Kinetics of colloidal deposition, assembly, and crystallization in steady electric fields

Soft Matter ◽  
2015 ◽  
Vol 11 (18) ◽  
pp. 3599-3611 ◽  
Author(s):  
Joseph A. Ferrar ◽  
Michael J. Solomon
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Crystallization Kinetics ◽  
Direct Current ◽  
Colloidal Spheres ◽  
Direct Current Electric Field ◽  
Colloidal Deposition ◽  
Kinetics Of ◽  
Current Electric Field

We quantify and model the deposition and crystallization kinetics of initially dilute colloidal spheres due to application of a steady, direct current electric field in the thin gap between parallel electrodes.

scholarly journals Direct-Current Electric Field Distribution in the Brain for Tumor Treating Field Applications: A Simulation Study

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Yung-Shin Sun
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Fields ◽  
Direct Current ◽  
Electric Field Distribution ◽  
Total Power ◽  
Head Model ◽  
Direct Current Electric Field ◽  
The Brain ◽  
Current Electric Field

Tumor Treating Fields (TTFields) in combination with chemotherapy and/or radiotherapy have been clinically reported to provide prolonged overall survival in glioblastoma patients. Alternating electric fields with frequencies of 100~300 kHz and magnitudes of 1~3 V/cm are shown to suppress the growth of cancer cells via interactions with polar molecules within dividing cells. Since it is difficult to directly measure the electric fields inside the brain, simulation models of the human head provide a useful tool for predicting the electric field distribution. In the present study, a three-dimensional finite element head model consisting of the scalp, the skull, the dura, the cerebrospinal fluid, and the brain was built to study the electric field distribution under various applied potentials and electrode configurations. For simplicity, a direct-current electric field was used in the simulation. The total power dissipation and temperature elevation due to Joule heating in different head tissues were also evaluated. Based on the results, some guidelines are obtained in designing the electrode configuration for personalized glioblastoma electrotherapy.

Direct measurement of the characteristic three-body electron attachment time in the atmospheric air in direct current electric field

2013 ◽  
Vol 103 (3) ◽  
pp. 034106 ◽  
Author(s):  
A. V. Shutov ◽  
I. V. Smetanin ◽  
A. A. Ionin ◽  
A. O. Levchenko ◽  
L. V. Seleznev ◽  
...  
Keyword(s):  
Electric Field ◽  
Direct Measurement ◽  
Direct Current ◽  
Electron Attachment ◽  
Atmospheric Air ◽  
Direct Current Electric Field ◽  
Three Body ◽  
Current Electric Field

Combustion of ethanol fuel droplet in vertical direct current electric field

2011 ◽  
Vol 33 (2) ◽  
pp. 2005-2011 ◽  
Author(s):  
O. Imamura ◽  
B. Chen ◽  
S. Nishida ◽  
K. Yamashita ◽  
M. Tsue ◽  
...  
Keyword(s):  
Electric Field ◽  
Direct Current ◽  
Fuel Droplet ◽  
Ethanol Fuel ◽  
Direct Current Electric Field ◽  
Current Electric Field

CFD-DEM study of the effects of direct current electric field on gas-solid fluidization

2020 ◽  
Vol 362 ◽  
pp. 416-427
Author(s):  
Guodong Liu ◽  
Pengwei Liao ◽  
Junnan Zhao ◽  
Shuai Wang ◽  
Yao Wu ◽  
...  
Keyword(s):  
Electric Field ◽  
Direct Current ◽  
Direct Current Electric Field ◽  
Current Electric Field

Influence of Uniform Electric Field in Bioremediation of Oil-Contaminated Soils

2013 ◽  
Vol 777 ◽  
pp. 253-257
Author(s):  
Jin Lan Xu ◽  
Dong Dong Sun ◽  
Ting Lin Huang ◽  
Long Fei Han
Keyword(s):  
Electric Field ◽  
Direct Current ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Control Treatment ◽  
Uniform Electric Field ◽  
Direct Current Electric Field ◽  
Inoculation Treatment ◽  
Current Electric Field ◽  
Electric Field Treatment

Electrokinetic remediation is an effective technology to enhance bioremediation of oil-contaminated soil as the transport process of non-polar organic contaminants in soil was promoted under low-power direct current electric fields. In this study three treatments including the application of electric field treatment alone, inoculation treatment alone, and combination of the application of electric field and inoculation treatment were carried out. The results indicated that highest removal efficiency was 83% in couple of the application of electric field and inoculation treatment. TPH concentration decreased from 6000 mg.kg-1 to 2000 mg.kg-1 when a 30 voltage direct current electric field was applied to oil-contaminated soil for 10 min after 4 days. It was observed that dehydrogenase activity had no increase after application direct current electric field. However, the TPH degradation efficiency was 52% higher than the control treatment. GC analysis showed that n-alkanes (C14-C31) were preferentially degraded, and soil remaindered more low quality compounds after the application of electric field treatment applied 52 days. These results indicated that the application of electric field improved degradation of inoculated bacteria through promoting the transport of nutrients, such as nitrogen and phosphorous and electron acceptors.

Optically isotropic state in bent core nematic mixtures with rod like molecules induced by direct current electric field

2013 ◽  
Vol 103 (16) ◽  
pp. 163501 ◽  
Author(s):  
Omaima Elamain ◽  
Gurumurthy Hegde ◽  
Katalin Fodor-Csorba ◽  
Lachezar Komitov
Keyword(s):  
Electric Field ◽  
Direct Current ◽  
Isotropic State ◽  
Direct Current Electric Field ◽  
Current Electric Field
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