State special unit standard of initial relative magnetic permeability

1981 ◽  
Vol 24 (5) ◽  
pp. 351-353
Author(s):  
A. A. Zima ◽  
S. G. Serebryakova ◽  
A. V. Serov ◽  
B. P. Filimonov ◽  
N. N. Chernousova
Keyword(s):  
Magnetic Permeability ◽  
Special Unit ◽  
Relative Magnetic Permeability ◽  
Unit Standard

MINIMIZING THE EFFECTIVE AREA OF SCATTERING BY MEANS OF CHANGING THE RELATIVE MAGNETIC PERMEABILITY

2021 ◽  
pp. 85-88
Author(s):  
А.В. Володько ◽  
С.М. Фёдоров ◽  
Е.А. Ищенко ◽  
М.А. Сиваш ◽  
Л.В. Сопина ◽  
...  
Keyword(s):  
Magnetic Permeability ◽  
Dielectric Material ◽  
Threshold Value ◽  
Effective Area ◽  
Large Object ◽  
Frequency Dependent ◽  
Relative Magnetic Permeability ◽  
Effective Scattering Area ◽  
Maximum Value ◽  
Simulation Results

Исследуется зависимость эффективной площади рассеяния (ЭПР) от относительной магнитной проницаемости материала, из которого изготавливается структура. В качестве тела моделирования был выбран шар, который изготовлен из диэлектрического материала, у которого возможно выполнять изменение относительной магнитной проницаемости. По полученным результатам моделирования построены графики зависимости максимального значения моностатической ЭПР от частоты, а также от относительной магнитной проницаемости среды. Было показано, что с увеличением относительной магнитной проницаемости материала изготовления происходит увеличение значения ЭПР объекта, а также обнаружена зависимость эффективной площади рассеяния от соотношения размеров шара и длиной волны, так при превышении порогового значения, после которого шар становится крупным объектом, ЭПР резко возрастает. По результатам исследования был построен график зависимости эффективной площади рассеяния шара от относительной магнитной проницаемости материала изготовления. Доказана возможность применения материала с частотозависимой относительной магнитной проницаемостью в качестве стелс-покрытия. В статье содержится исследуемая модель, графики полученных результатов, по которым можно легко определить зависимость ЭПР от частоты и от относительной магнитной проницаемости материала изготовления The article investigates the dependence of the effective scattering area (ESA) on the relative magnetic permeability of the material from which the structure is made. We chose a sphere as the modeling body, which is made of a dielectric material, in which it is possible to change the relative magnetic permeability. Based on the obtained simulation results, graphs of the dependence of the maximum value of monostatic ESA on frequency, as well as on the relative magnetic permeability of the medium, were constructed. It was shown that with an increase in the relative magnetic permeability of the material of manufacture, an increase in the value of the ESA of the object occurs, and the dependence of the effective scattering area on the ratio of the size of the ball and the wavelength was found, so when the threshold value is exceeded, after which the ball becomes a large object, ESA rises sharply. Based on the results of the study, a graph of the dependence of the effective scattering area of the sphere on the relative magnetic permeability of the material of manufacture was built. The possibility of using a material with a frequency-dependent relative magnetic permeability as a stealth coating was proven. The article contains the investigated model, graphs of the results obtained, by which it is easy to determine the dependence of the ESA on the frequency and on the relative magnetic permeability of the material of manufacture

scholarly journals A Method For Determination Of Specific Electrical Resistance Of Steel And Nano-Coating Sputtered On It

2015 ◽  
Vol 2 ◽  
pp. 118 ◽  
Author(s):  
Andris Martinovs ◽  
Josef Timmerberg ◽  
Konstantins Savkovs ◽  
Aleksandrs Urbahs ◽  
Paul Beckmann
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Permeability ◽  
Electrical Resistance ◽  
Skin Effect ◽  
Specific Electrical Resistance ◽  
Specific Electrical Conductivity ◽  
Relative Magnetic Permeability ◽  
Nano Coating ◽  
Cylindrical Steel

The paper describes methods developed to determine specific electrical conductivity and relative magnetic permeability of cylindrical steel items and nano-coatings deposited on them by sputtering. Research enables development of a new method for determination of thickness of vacuum deposited nano- coating that is based on application of skin effect.

Physical properties of titanomagnetite sands

Geophysics ◽  
1980 ◽  
Vol 45 (3) ◽  
pp. 394-402 ◽  
Author(s):  
D. C. Lawton ◽  
M. P. Hochstein
Keyword(s):  
Magnetic Susceptibility ◽  
New Zealand ◽  
Binary Mixture ◽  
Electric Field ◽  
Physical Properties ◽  
Magnetic Permeability ◽  
Induced Polarization ◽  
Laboratory Measurements ◽  
Relative Magnetic Permeability ◽  
Polarization Response

Laboratory measurements of density, magnetic susceptibility, remanence, resistivity, and induced‐polarization response of New Zealand titanomagnetite sands (“ironsands”) were made for different volume concentrations [Formula: see text] of titanomagnetite in the range 10 to 100 percent. Both density ρ and magnetic susceptibility κ of these sands increase monotonically with [Formula: see text]; the observed variation of κ as a function of [Formula: see text] can be explained by changes of the resultant relative magnetic permeability μ of a binary mixture of magnetic and nonmagnetic grains. The natural remanence of titanomagnetite sands is small (Koenigsberger ratio Q < 0.2). No significant induced‐polarization response could be observed even for mixtures of almost pure titanomagnetite. When placed in an electric field, the titanomagnetite sands were found to be nonconductive.

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