2. The boundary value problem on the magnetic vector potential A is derived by introducing the magnetic vector potential A and using Maxwell's equations.

The boundary element equations, represented by the magnetic vector potential in exterior region of an axisymmetrical transverse magnetic model and combined with the impedance boundary condition formulation,for electromagnetic field problems in coreless induction meting furnace are direved.

A mathematical model was deduced to describe the finite element method(FEM) simulation of induction heating with the magnetic vector potential with the ANSYS software.

Taking the conjugate variation of the simplified vector potential,combining the magnetic vector potential and electric one,as the weighting function,a finite-element method is first developed for three-dimentional travelling- wave eddy-current field and thus the calculation problem of the eddy-current field, accounting for the action of shield but neglecting the action of field winding,is effectively solved.

Two kinds of methods particularly suitable to shape optimization, semi-analytic method and local difference method, are proposed to calculate the first-order derivatives of magnetic flux density with respect to the design variables on the basis of solving sensitivity equations of the magnetic vector potential.

In this paper we introduced that the magnetic vector potential was used for computing the magnetic fields due to current distribution of a circular loop antenna and derived the relations between impedance and wavelength.

This paper gives a method to graph magnetic induction line in a plane magnetic field through calculating contour of the magnetic vector potential of steady current's magnetic field.

Aimed at the detector of a capacitance proximity fuze, this paper discusses the basic characteristics of its detection field according to its operating frequency and the basic structure features of electrodes through setting up the models of the magnetic vector potential and scarlar potential of the capacitance detection field. After demonstrating its operating field zone, this paper comes to the conclusion that the field zone in which the capacitance fuze works is a quasi electrostatic field.

Based on solving the magnetic vector potential of a ferromagnetic cylinder,the laws of eddy current density and power loss of the cylinder in an alternating magnetic field perpendicular to its axis are derived.

Established satellite kinematic and dynamics equation. Use the magnetic vector for the observation information, the paper estimate the location and rate of the satellite, analysis of simulation results and the sources of error. To further enhance navigation accuracy, the paper study the Unscented Kalman Filter, compare with the Extend Kalman Filter.

According to the TDIE method, the scattered field can be expressed by use of the magnetic vector and electric scalar potentials and they can be calculated by using the surface current.

It is proved that in magnetic flux leakage testing, across the interface between magnetoconductive medium with different permeabilities, if the continuity conditions for tangential component of magnetic vector potential was got strengthened, the continuity condition of the normal component of the magnetic vector potential would be the natural interface conditions provided automatically by means of inherent in the variational procedure.

By means of calculating the magnetic vector potential approximately, the magnetic field distribution of the closely round solenoid carrying static current is obtained.

The rotation, during metamorphism, of magnetic grains (magnetite, ilmenite etc.) enclosed in the lenticular rock-forming minerals causes deviation of the magnetic vector from its original position.

A new instrument for measuring the magnetic vector of rock specimens while they are being heated is described and the performance and advantages of the instrument are discussed.

We confirm the fact that the magnetic vector makes a small angle (25 °) with the long axis of the prominence.

The inclination of the magnetic vector increases from ψ = 0 ° at r = 0 to ψ = 90 ° at the penumbra-photosphere border, its variation across the spot is not consistent with a purely radial (poloidal) field.

The averaged fluid velocity corresponds to the magnetic vector-potential, the perturbation of the averaged pressure to the scalar potential, and the body force due to nonuniformity of Reynolds stresses corresponds to the electric field.

The system of transfer equations of the four Stokes parameters I, Q, V, V under the action of the magneto-optical effect (i.e. Unno-Beckers equations) are numerically solved in this paper for the magneto-sensitive lines FeI λλ 6302.499 and 5324.191 with an appropriate sunspot model. The errors in the expressions of the. coefficients ρ_R and ρ_W in Beckers' paper [2] have been corrected for. From the results of calculations some properties of the profiles of the Stokes parameters in connection with the magnetic...

The system of transfer equations of the four Stokes parameters I, Q, V, V under the action of the magneto-optical effect (i.e. Unno-Beckers equations) are numerically solved in this paper for the magneto-sensitive lines FeI λλ 6302.499 and 5324.191 with an appropriate sunspot model. The errors in the expressions of the. coefficients ρ_R and ρ_W in Beckers' paper [2] have been corrected for. From the results of calculations some properties of the profiles of the Stokes parameters in connection with the magnetic vector have been found. Our computations also show that the magnetooptical effect should be taken into consideration in the measurements of vector magnetic fields. In the fourth section of this paper we have established a simple and convenient method for obtaining the information of the magnetic vector (including the strength of magnetic field B, the angle between the direction of magnetic field and the line of sight γ as well as the azimuth of magnetic field X) from the profiles of the Stokes parameters. Our method consists of the following three steps: (1) The value of B can be determined from the distance of the highest point in the V-profile from the central line. (2) When B becomes known, γ may be found from V_(max), i.e. the maximum value of V. (3) When both B and γ are known, one may obtain the angle X from Q_0, i.e. the value of Q at line center.

The process of karst development in carbonate rocks is the result of combined effect of various factors. The paleoclimate and paleoenvironment acted as the major factor controlling the paleokarst development in Hebei Province. The southern part of Hebei Province during the Eogene period of the Himalayan phase is characterized by tropic-subtropic climate. According to the magnetic vector values obtained from the Paleomagnetic survey, the ancient latitude of Xingtai-Neiqiu area in Hebei province was calculated...

The process of karst development in carbonate rocks is the result of combined effect of various factors. The paleoclimate and paleoenvironment acted as the major factor controlling the paleokarst development in Hebei Province. The southern part of Hebei Province during the Eogene period of the Himalayan phase is characterized by tropic-subtropic climate. According to the magnetic vector values obtained from the Paleomagnetic survey, the ancient latitude of Xingtai-Neiqiu area in Hebei province was calculated to be 20.6°, about 16°S apart from the present latitude. The Eogene period was the period dominated by paleokarst development in Hebei Province. Karst caves at various levels formed during that period have been found scattering in the Taihang Mts, the Yanshan Mts and the hidden ancient mountains thousands of metres deep under the Hebei plain. The paleokarst not only existed in Hebei Province but also developed intensely. Therefore it cannot be denied that there were ancient karsts in North China under the con-dition of modern climate. However, paleokarst features cannot be confused with modern karst ones.

By means of calculating the magnetic vector potential approximately, the magnetic field distribution of the closely round solenoid carrying static current is obtained.