scholarly journals Mathematical Modelling of Electric and Magnetic Fields of Main Pipelines Cathodic Protection in Electrically Anisotropic Media

2021 ◽  
Vol 225 ◽  
pp. 04002
Author(s):  
Vladimir Krizsky ◽  
Pavel Aleksandrov ◽  
Alexey Kovalskii ◽  
Sergey Viktorov
Keyword(s):  
Mathematical Model ◽  
Electrical Conductivity ◽  
Magnetic Fields ◽  
Electrochemical Corrosion ◽  
Azimuth Angle ◽  
Specific Electrical Conductivity ◽  
Main Pipeline ◽  
Main Pipelines ◽  
Electric And Magnetic Fields ◽  
Angle Of Rotation

A mathematical model is constructed and computational experiments are performed to study the effect of anisotropy of the specific electrical conductivity of the soil on the distribution of electric and magnetic fields generated by cathodic electrochemical corrosion protection stations of the underground main pipeline (MP). The variation of electric and magnetic fields depending on the azimuth angle of rotation of the specific electrical conductivity tensor of the soil containing the pipeline is analysed.

Study of Thermal Resistance and Mechanical Properties of Thin Sheets of Low-Alloyed Aluminum Al-Cu-Mn and Al-Mg-Si Alloys

2016 ◽  
Vol 870 ◽  
pp. 95-100
Author(s):  
E.G. Demyanenko ◽  
I.P. Popov
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Magnetic Fields ◽  
Thermal Resistance ◽  
Specific Electrical Conductivity ◽  
High Plasticity ◽  
Pulsed Magnetic Fields ◽  
Aircraft Manufacturing

The paper investigates a variety of properties of thin aluminum sheets fabricated using physical action of pulsed magnetic fields and weak pulsed current. The possibility of using thermal resistant aluminum alloys parts in aircraft manufacturing, including ones made by forming processes which require sufficiently high plasticity of initial sheets, is widely discussed. Two possible technological options have been tested for manufacturing sheet samples of Al-Cu-Mn and Al-Mg-Si alloys. A set of properties has been investigated (thermal resistance, mechanical properties, specific electrical conductivity, macrostructure of weldability zones, corrosion resistance of alloy samples. Casted workpieces were thermo-mechanically treated by heating and upsetting to 50 – 55 % with consequent hardening and aging. After that workpieces were subjected to multi-cycle rolling up to 0.3x10-3 m. The achieved results demonstrate that after 400 hours of exposure to 250°C, the thermal resistant parameters by tensile strength are higher after the exposure to weak pulsed currents than after the exposure to pulsed magnetic fields. Maximal thermal resistant parameters by tensile strength and maximal electrical conductivity was achieved in 01327+Sc (Al-Mg-Si) alloy. The mechanical properties, corrosion resistance and Erichsen formability parameters were also determined.

VARIATION OF ELECTRICAL CONDUCTIVITY WITH DEPTH BY THE MAGNETO‐TELLURIC METHOD

Geophysics ◽  
1960 ◽  
Vol 25 (5) ◽  
pp. 998-1008 ◽  
Author(s):  
E. R. Niblett ◽  
C. Sayn‐Wittgenstein
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Fields ◽  
Surface Structure ◽  
Continuous Recording ◽  
Research Station ◽  
Electric And Magnetic Fields

Apparatus has been installed at the Dominion Observatory Research Station at Meanook, Alberta, for the continuous recording of earth potentials. The theory due to Cagniard (1953) and others, in which relative amplitudes of horizontal components of electric and magnetic fields are used to interpret the sub‐surface structure, is applied in a modified form, to data from the Meanook records. Values of electrical conductivity between depths of 10 km and 100 km are estimated, and found to vary roughly between [Formula: see text] and [Formula: see text] e.m.u.

scholarly journals Dynamics of electric and magnetic fields in case of the urban environment

2021 ◽  
Vol 265 ◽  
pp. 02001
Author(s):  
Vladimir I. Sturman ◽  
Alyona N. Loginovskaya ◽  
Anastasiya A. Dolganova ◽  
Mihail V. Shirokov
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Fields ◽  
Transmission Lines ◽  
Indirect Effects ◽  
Temporal Dynamics ◽  
Weather Conditions ◽  
Line Frequency ◽  
Saint Petersburg ◽  
Electric And Magnetic Fields

This paper studies the temporal dynamics of power-line frequency electric and magnetic fields in Saint-Petersburg and environs. It is found that electromagnetic fields generated by high-voltage transmission lines (HVTL) constantly change, depending on their loading and weather conditions. The dependence on weather conditions involves both the direct effect of air electrical conductivity as a function of its humidity, and indirect effects including the dependence of energy consumption on temperature and also the correlations between meteorological characteristics. An attempt has been made to evaluate the role of influencing factors.

scholarly journals Comparative Analysis of Methods for Mathematical Modeling of Specific Electrical Conductivity of Plasma in the Channel of an Electric Discharge in Water

2021 ◽  
Vol 57 (4) ◽  
pp. 24-34
Author(s):  
V.M. Kosenkov ◽  
Keyword(s):  
Mathematical Modeling ◽  
Experimental Data ◽  
Mathematical Model ◽  
Electrical Conductivity ◽  
Comparative Analysis ◽  
Electric Discharge ◽  
Specific Electrical Conductivity ◽  
Empirical Function ◽  
Electric Discharge In Water

In the present work, a comparative analysis of three methods for determining the specific electrical conductivity of the plasma formed in the channel of an electric discharge in water is carried out for its mathematical modeling. The parameters of the empirical function are determined, at which the results of mathematical modeling are consistent with the experimental data. The necessity of using empirical functions in calculating the specific electrical conductivity of plasma has been substantiated. The obtained ratios made it possible to significantly increase the adequacy of the previously developed mathematical model of the physical discharge processes in water and to expand the range of parameters in which it can be used.

Electrical Conductivity of Thin Polycrystalline La0.83Sr0.17MnO3 Films in Pulsed High Electric and Magnetic Fields

2009 ◽  
Vol 159 (1-2) ◽  
pp. 68-71 ◽  
Author(s):  
S. Balevičius ◽  
N. Žurauskienė ◽  
V. Stankevič ◽  
S. Keršulis ◽  
A. Abrutis ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Fields ◽  
Electric And Magnetic Fields ◽  
Thin Polycrystalline

scholarly journals DEVELOPMENT OF A MATHEMATICAL MODEL OF THE ELECTRICAL CONDUCTIVITY OF FEED WATER IN TPS

2020 ◽  
Vol 2020 (2) ◽  
pp. 27-33
Author(s):  
Kh Isakhodjaev ◽  
◽  
L Alimova ◽  
N Usmonov ◽  
Z Yusupov
Keyword(s):  
Mathematical Model ◽  
Electrical Conductivity ◽  
Thermal Power Station ◽  
Water Samples ◽  
Pure Water ◽  
Thermal Power ◽  
Specific Electrical Conductivity ◽  
Feed Water ◽  
Power Station ◽  
Calculated Limit

The article deals with the development of mathematical model of electric conductivity of thermal power station TPS process waters. The ranges of possible temperatures of heat carrier (water) samples are given. The plots of empirical expressions in the range of temperatures from 0 to 120 °С and at higher temperatures are analyzed. The results obtained by these formulas for the temperature range from 0 to 100 °С are practically the same. The figures indicate changes in calculated limit motions of and ions depending on temperature. The calculated equation of reduction of specific electrical conductivity to the value at 25 °С for pure water is obtained.

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