Electrodynamic response of a nanosphere

The electrodynamic response of electron gas on the surface of a nanosphere in a weak magnetic field is studied. The case of the photon polarization vector oriented parallel to the magnetic field (the Faraday geometry) is considered. An analytic expression for the coefficient of electromagnetic-radiation absorption by the nanosphere is derived. It is shown that, at low temperatures, the absorption curve has, in the general case, two resonance peaks. The curve also exhibits breaks.     

Electrodynamic trap for neutral atoms

An electrodynamic trap is proposed that stores cold neutral atoms or nonpolar molecules in their ground state as well as in excited states by means of the quadratic Stark effect. The trap uses an oscillating hexapole field and a superposed static homogeneous field. The dynamics of an atom in this trap can be described as a harmonic oscillation in a static pseudopotential. Stability criteria and sample parameters for a number of atomic species are given. Received: 7 August 1998 / Received in final form: 7 January 1999     

Anomalous Electrodynamic Explosions in Liquids

The recently reported Graneau experiments on electrodynamic explosions in liquids, which reveal anomalous longitudinal electrodynamic forces of the order of 104 times greater than expected, verify the need for a term in the law of electrodynamics that corresponds to the ion/electron mass ratio. This confirms an earlier theoretical interpretation of the anomalous cathode reaction forces found in the vacuum arc.     

Electrodynamic equations in noninertial reference frames

The formalism for analysis of exterior spatial differential forms developed by the present author is used to study the equations of electrodynamics in noninertial reference frames. General covariant differential and integral relationships which generalize the corresponding laws of classical three-dimensional electrodynamics in inertial reference frames are obtained.Translated from Izvestiya Vysshykh Uchebnykh Zavedenii, Fizika, No. 7, pp. 97–104, July, 1978.The author expresses his sincere gratitude to V. I. Rodichev for his constant interest in the study and valuable advice.     

Electrodynamic features of anisotropic hard superconductors

The low-frequency electromagnetic response of superconducting plates characterized by strong anisotropy of current-carrying capacity in the plane of the sample is studied experimentally and theoretically. Measurements are made on polycrystalline textured plates of the Y-123 system with the c axis lying in the plane of the sample and on a single crystal with a single preferred direction of twinning boundaries. It is shown that the shape of the curves describing the dependence of the relative losses q on the ac field amplitude h ₀ is quite sensitive to the orientation of vector h ₀ in the sample plane. As in the case of isotropic samples, the q(h ₀) dependence is characterized by a single size peak if vector h ₀ is oriented along one of the principal symmetry directions of the anisotropic critical current density. If h ₀ deviates considerably from principal directions, two size peaks are observed on the q(h ₀) curve. A detailed analysis of the evolution of the q(h ₀) curves upon a rotation of vector h ₀ in the sample plane is carried out.     

Electrodynamic radiation reaction and general relativity

We argue that the well-known problem of the instabilities that are associated with the self-forces (radiation reaction forces) in classical electrodynamics are possibly stabilized by the introduction of gravitational forces via general relativity.     

Electrodynamic Plasma Thruster with Capillary-Porous Electrode

Technical Physics - A scheme of a spacecraft thruster based on a stationary electrodynamic plasma accelerator with capillary-porous electrodes is proposed. Such electrodes are renewable and...     

Electrodynamic properties of plane wire grids

The method of submillimetre BWT-spectroscopy is used to measure electrodynamic parameters of the grids wound from conductors with circular cross sections. The coefficients of transmission and reflection, reflected wave phase, and ohmic losses in conductors are measured in the range of small values of diffraction parameteræ=D/<1 ( is the wavelength,D is the grid spacing) for the case where the wave vector E is directed along the conductors (E1). In the diffraction region (0.5<æ<2.2), transmission spectra of the grids are measured for both polarizations. The data obtained are compared to those of different theoretical methods for describing grid electrodynamics. In particular, the transmission spectra are shown to have some peculiarities in the vicinity of sliding pointsæ=1;2 (E1), unpredicted by corresponding theories.     

Electrodynamic acceleration of small conducting particles

The possibility of separation of conducting submillimeter particles from nonconducting elements of a friable rock is theoretically substantiated in the present work. It is suggested to accelerate particles upon exposure to a nonstationary and nonuniform magnetic field created by a system of magnetic coils. Approximate analytical expressions for the velocity of a conducting particle are derived in the paper for the simplest configuration of fields of two induction coils. It is demonstrated that in the present stage of development of high-current electronics, it is technically possible to obtain the velocity of translational particle motion of a few tens of centimeters per second. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 90–95, January, 2008.     

Electrodynamic Anomalies in Arc Discharge Phenomena

The assumption that two electric particles are insufficient by their mutual action to develop a torque makes the Lorentz law a special case of a more general law of electrodynamics, of importance when electrodynamic closed circuit interactions involve charge carriers of different mass. Experimental anomalies evident in the mutual electrodynamic behaviour of ions and electrons are reviewed. It is argued that there is now sufficient evidence for this more general law of electrodynamics to be given attention by the electrical engineer interested in plasma and discharge phenomena.     

Electrodynamic Analysis of T-Shape Waveguide Junction Cells

An original cells for testing parameters of magnetodielectric materials are proposed. A rigorous electodynamic models for microwave signal transmission through such cell containing a sample being tested have been constructed. It has been found that maximum transmission coefficients are observed at frequencies of eigen and quasi-eigen modes depending on selected regime of the cell. Numerous experiments prove that the test cell in quasi-eigen mode regime is essentially more sensitive than in eigen one.     

超对称电动力学系统的Faddeev-Senjanovic量子化

用Faddeev-Senjanovic量子化方法对超对称电动力学系统在一般情况下进行了量子化, 得到了格林函数的生成泛函. 通过对一些约束作线性组合获得了另一个第一类约束, 构造出了该体系的规范生成元, 导出了该系统的规范不变的对称变. 由一个规范条件的自恰性导出了另一个规范条件, 发现超对称电动力学系统的次级第一类约束对应物理电荷守恒律, 从而使过去要算很多次级约束才能截断的约束自然截断, 因而使超对称电动力学系统在一般情况下的Faddeev-Senjanovic量子化被简化.     

Electrodynamic theory of coupled dielectric fin lines

An electrodynamic theory is constructed for a shielded model of coupled identical dielectric fin lines for use in EHF three-dimensional integrated circuits (TDIC) as transmission lines or as a foundation for the EHF TDIC component base. The analysis is based on a system of integral equations, whose algebraization is performed by the Budnov-Galerkin method. The desired fields are represented in the form of expansions in Chebyshev polynomials of the first and second kind, which allows the characteristics of the electromagnetic field near the fins of the examined transmission line to be taken into account directly. The system of linear algebraic equations is reduced in the course of a numerical experiment. Data on the two main (even and odd) waves and a few higher modes are obtained. Approximate results obtained earlier are evaluated (by the transverse-resonance method, expansion in an incomplete system, etc.).Institute of Radio Engineering and Electronics, Russian Academy of Sciences. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vo.. 36, No. 1, pp. 74–87, January, 1993.     

Electrodynamic thermal breakdown of a capacitor insulator

Technical Physics - A mechanism of the electrical breakdown is proposed for modern metal-field capacitors with the well-known property of self-healing of the breakdown strength. Upon an increase in...