scholarly journals INTERPRETATION POSSIBILITIES OF DISC TYPE SOURCES ELECTRIC FIELDS

2020 ◽  
pp. 28-34
Author(s):  
Y. Hloba ◽  
R. Hloba ◽  
M. Reva ◽  
S. Vyzhva
Keyword(s):  
Electric Current ◽  
Electric Fields ◽  
Protective Layer ◽  
Point Sources ◽  
Point Of View ◽  
Protective Potential ◽  
Anomalous Field ◽  
Underground Pipelines ◽  
Longitudinal Gradients ◽  
Extent Of Damage

As a result of aging of the protective insulation layer of underground pipelines, which occurs under the influence of external factors, in the insulating protective layer can form places where the insulation is damaged that cause a leakage of electric current under the protective potential of the pipe. These processes lead to a decrease in the protective potential of underground pipelines, and thus to a deterioration in the protection of underground utility system. Such damage locations are recorded by surveying the distribution of the electric potential "soil-pipe" (Usp) along the pipeline route by the remote electrode and measuring the "transverse and longitudinal gradients" of the electric field. Since the places of electric current leakage are sources of electric fields, it is important to know the features of these fields in order to assess the degree and extent of damage. From a fundamental point of view, this question comes down to solving the inverse problem of electrometry for fields created by different structure sources. In the case of detailing anomalies, it is desirable to obtain electrometric survey data with an accuracy that allows to apply for their quantitative interpretation methods that base on analytical relationships for anomalies of these parameters. In this paper there is an analysis of the possibilities of using methods which is appropriate for fields created by point sources to interpret the anomalous field caused by a source of leakage current of the disk type damage.

scholarly journals The Electrical Behaviour of a Medium Voltage Polymer Insulator with Deposited Moss Layer on the Surface

2019 ◽  
Vol 8 (4) ◽  
pp. 6409-6414
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Point Of View ◽  
Electrical Behaviour ◽  
Medium Voltage ◽  
High Frequency Structure Simulator ◽  
Polymer Insulator ◽  
Risk Areas ◽  
Proper Design ◽  
Insulation Coordination

This paper presents a study on the voltage and electric fields behaviours of a 10kV polymer insulator with moss deposited under dry (air) condition. The aim of this study is considering on the electrical behaviour of insulator by having a surface layer of moss on it that can change the withstand voltage of insulators. It should be mentioned that these moss layers are commonly crated in the jungles especially in the tropical countries. To study on the above mentioned case, simulations were carried out using ANSYS High Frequency Structure Simulator (HFSS). The simulation insulator modelling includes the computerized evaluation of voltage and electric field distribution at three different locations for both clean and moss contaminated insulators. Noted that the electric field and also voltage profiles at different parts of insulators has been determined using applied simulated model. The moss contamination polymer insulator displayed a discontinuous distribution of the electric field compared to the clean insulator and their voltage distribution decreased with distances from the source. The results indicated that electric field along the insulator surface were greatly affected by hydrophobicity characteristic of the polymer. Therefore, the surrounding air of the moss contaminated insulator was prone to initiate a flashover. This study can be helpful for designing the distribution lines especially in high risk areas to set a proper design from the point of view of insulation coordination.

scholarly journals Correlation Between the Electric Current Generated by a Bean Root Growing in Water and the Rate of Elongation of the Root

1955 ◽  
Vol 8 (1) ◽  
pp. 36 ◽  
Author(s):  
BIH Scott AL Mcaulay ◽  
Pauline Jeyes
Keyword(s):  
Electric Current ◽  
Electric Fields ◽  
Bean Root ◽  
Methods Of Measurement

Methods of measurement of the electric fields produced by plants have been developed which eliminate artefacts commonly present in such investigations.

scholarly journals Characterization of Simple and Double Yeast Cells Using Dielectrophoretic Force Measurement

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3813 ◽  
Author(s):  
Fernando-Juan García-Diego ◽  
Mario Rubio-Chavarría ◽  
Pedro Beltrán ◽  
Francisco J. Espinós
Keyword(s):  
Electric Fields ◽  
Force Measurement ◽  
Point Of View ◽  
Yeast Cells ◽  
Instrumental Method ◽  
Particle Characterization ◽  
Dielectrophoretic Force ◽  
Cell Velocity ◽  
First Time

Dielectrophoretic force is an electric force experienced by particles subjected to non-uniform electric fields. In recent years, plenty of dielectrophoretic force (DEP) applications have been developed. Most of these works have been centered on particle positioning and manipulation. DEP particle characterization has been left in the background. Likewise, these characterizations have studied the electric properties of particles from a qualitative point of view. This article focuses on the quantitative measurement of cells’ dielectric force, specifically yeast cells. The measures are obtained as the results of a theoretical model and an instrumental method, both of which are developed and described in the present article, based on a dielectrophoretic chamber made of two V-shaped placed electrodes. In this study, 845 cells were measured. For each one, six speeds were taken at different points in its trajectory. Furthermore, the chamber design is repeatable, and this was the first time that measurements of dielectrophoretic force and cell velocity for double yeast cells were accomplished. To validate the results obtained in the present research, the results have been compared with the dielectric properties of yeast cells collected in the pre-existing literature.

scholarly journals Equatorial night-time F-region zonal electric fields

1995 ◽  
Vol 13 (8) ◽  
pp. 871-878 ◽  
Author(s):  
S. S. Hari ◽  
B. V. Krishna Murthy
Keyword(s):  
Seasonal Variation ◽  
Electric Field ◽  
Electric Fields ◽  
Night Time ◽  
Equatorial Station ◽  
F Region ◽  
Vertical Drift ◽  
Longitudinal Gradients ◽  
Cycle Maximum ◽  
E Region

Abstract. Night-time F-region vertical electrodynamic drifts at the magnetic equatorial station, Trivandrum are obtained for a period of 2 years, 1989 and 1990 (corresponding to solar cycle maximum epoch), using ionosonde h'F data. The seasonal variation of the vertical drift is found to be associated with the longitudinal gradients of the thermospheric zonal wind. Further, the seasonal variation of the prereversal enhancement of the vertical drift is associated with the time difference between the sunset times of the conjugate E-regions (magnetic field line linked to F-region) which is indicative of the longitudinal gradients of the conductivity (of the E-region). The vertical drifts and the causative zonal electric fields at Trivandrum are compared with those at Jicamarca and F-region zonal electric field models. It is seen that the night-time downward drift (as also the causative westward electric field) at Jicamarca is greater than that at Trivandrum. The prereversal enhancement of the drift is greater at Jicamarca than at Trivandrum during the summer and the equinoxes, whereas during the winter the opposite is the case.

scholarly journals Four Subjects in Solar Physics from the Point of View of the Electric Current Approach

2020 ◽  
pp. 33-45
Author(s):  
Syun-Ichi Akasofu
Keyword(s):  
Solar Wind ◽  
Electric Current ◽  
Solar Flares ◽  
Solar Physics ◽  
Current Approach ◽  
Point Of View ◽  
Coronal Temperature ◽  
The Past ◽  
Electromagnetic Processes ◽  
Difficult Subjects

Four major subjects in solar physics, the heating of the corona, the cause of the solar wind, the formation of sunspots and the cause of solar flares, are discussed on the basis of the electric current approach, a sequence of processes consisting of power supply(dynamo), transmission (currents/circuits) and dissipation(high coronal temperature, solar wind, sunspots and solar flares).This is because the four subjects have hardly been considered in terms of the electric current approach in the past, in spite of the fact that these subjects are various manifestations of electromagnetic processes. It is shown that this approach provides a new systematic way of considering each subject; (1) the long-standing issue of the coronal temperature, (2)the long-standing problem on the cause of the solar wind, (3)the presence of single spots(forgotten or dismissed in the past) and its relation to unipolar magnetic regions and (4) the crucial power/energy source and subsequent explosive processes of solar flares. The four subjects are obviously extremely complicated and difficult subjects, but it is hoped that the electric current approach might provide a new insight in considering the four subjects.

scholarly journals Electrophysical characteristics of germanium MIS structures with rare-earth element fluorides

2021 ◽  
Vol 24 (2) ◽  
pp. 68-72
Author(s):  
Natalia V. Sachuk ◽  
Margarita B. Shalimova
Keyword(s):  
Rare Earth ◽  
Electric Fields ◽  
Rare Earth Element ◽  
Earth Element ◽  
Surface States ◽  
Film Structure ◽  
Point Of View ◽  
Low Leakage ◽  
Low Leakage Current ◽  
Mis Structures

The electrical properties of MIS structures with rare-earth element fluorides on germanium substrates were studied to analyze the possibility of using these materials as gate dielectrics of devices. The structures are also studied from the point of view of assessing the degradation of their electrophysical properties under the action of electric fields of ~108 V/m, which act on the dielectric during electroforming, since the MIS structures with rare-earth element fluorides have the property of bistable switching. Studies of the I-V and C-V characteristics show that all structures have approximately the same value of the density of surface states at the rare-earth element / Ge fluoride interface. The leakage currents in the MIS structures with TmF3 and SmF3 film are less than in the MIS structures with NdF3 film of greater thickness. There is also no effect of reducing the current density when using the double film structure CeF3/DyF3. The most promising material with a low leakage current at a fairly high value of the dielectric constant in germanium MIS structures is thin-film samarium fluoride.

Flow of Electrolyte With a Surface-Charged Particle in a Nano-Channel: Quasi-Steady Modeling

2009 ◽  
Author(s):  
Z.-P. Qin ◽  
Y.-S. Wang ◽  
G.-X. Wang
Keyword(s):  
Charged Particle ◽  
Electric Current ◽  
Electric Fields ◽  
Planck Equation ◽  
Coupled System ◽  
Navier Stokes Equation ◽  
Ion Concentrations ◽  
Small Pore ◽  
Nano Channel ◽  
Current Change

A Resistive Pulse Sensor (RPS) is a device for counting and characterizing small particles by recording the electrical current change (negative pulse) during the translocation of the particle through a small pore. RPS is now widely used to characterize various micro/nano size particles, including bio-particles, proteins, and DNA. This paper presents a comprehensive multi-physical model of RPS. The model involves a coupled system of the Navier-Stokes equation for flow field, the Nernst-Planck equation for electrolyte ion concentrations, and the Poisson equation for electrical field. The model is used to simulate the quasi-steady flow of electrolyte with a fixed surface charged particle in a micro/nano-channel connecting two reservoirs. The channel and reservoir are assumed to be cylindrical and a 2-D axial-symmetry system is used. The model predicts the flow and electric fields as well as the distribution of the ion concentrations in the channel. The effects of Electrical Double Layer (EDL) on the electric current change through the channel are then investigated. Conditions for the electric current change (positive and negative pulses) are then identified.

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