Fundamental and parasitic wave modes of a shielded microstrip line

Conclusions It was demonstrated that for the usually employed widths of the shield in MSL a parasitic quasi-LM₁₀ wave may propagate besides the working quasi-TEM wave; the quasi-LM₁₀ wave interacts with the working wave in the inhomogeneities of the line and may disrupt the normal operation of devices having MSL. The propagation constants of these two lower wave modes may be determined comparatively simply with an accuracy of the order of 1% by means of the first-approximation dispersion equation derived in the present paper. The system of linear algebraic equations derived in the present paper may serve for the analysis and calculation of the characteristics of the higher wave modes.Patrice Lumumba University of Friendship among Peoples. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 16, No. 1, pp. 118–128, January, 1973.     

Determination of stresses near multiple pores and rigid inclusion by relaxation elements

The relaxation element method (REM) is used to obtain the stress field for three circular pores under uniaxial tensile loading. A model for determining the sites of localized plastic deformation in polycrystal with a rigid inclusion is also presented. Here, a pore is defined as a very soft inclusion. The results are compared with those found by using the finite element method.     

On the creation of stable periodic behavior of parametrically excited dynamical systems

The problem of the realization of stable periodic behavior of dynamical systems is considered. It is shown analytically that in certain cases it is possible to achieve by parametric perturbation stable periodic behavior of systems that in the autonomous case possess only unstable oscillatory or stationary regimes or are in a stable equilibrium position.Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 104, No. 3, pp. 507–512, September, 1995.     

Phase operator properties in quantum optics

Eigenstate properties of the phase variables of quantum optics fields are investigated. Arbitrary states are expanded in them. The statistics of these states are determined. The normalformof the corresponding phase operator is found.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 44–48, December, 1972.     

Ozone production and de-NO x modeling in dry air electrical discharges

Numerical simulations are performed to assess the possibility of using different kinds of electrical discharges operating in dry air under normal conditions as ozone generators. The ozone production and NO_x destruction efficiency are investigated as a function of discharge parameters such as the reduced electric field, the energy deposition, and the electron density. The specific energy deposition becomes a key parameter to compare the different classes of ozonators. During the operative phase the electric discharge produces an appreciable amount of nitrogen oxides. Taking into consideration both the active phase of flue gas processing and the post-discharge phase it is possible to achieve a good NO_x-removal efficiency even for initial concentrations as high as 1000 ppm. The main processes and characteristic times are discussed.