Generalized Dirac-Pauli equations in the Weinberg-Salam theory of electroweak interactions

M. V. Lomonosov State University, Moscow. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 65–68, June, 1992.     

Low-frequency plasmons in coupled electronic microstructures

The plasmon spectrum and the absorption of an electromagnetic wave in an electronic two-dimensional plasma with strongly modulated density are studied. The appearance of additional plasmon modes in a system of electronic wires and islands with weak current coupling is described in a model of an electronic system covered with metallic gates. Such plasmon modes appear in the low-frequency region of the spectrum, as compared with the conventional plasma oscillations, and have recently been observed experimentally in paired wires. Fiz. Tverd. Tela (St. Petersburg) 40, 542–545 (March 1998)     

Influence of quantum fluctuations on the motion of an electron in the field of a plane electromagnetic wave

The influence of radiation on the change in the energy, the longitudinal component of the momentum, and the shape of the orbit of an electron in the field of a wave is investigated. A comparison with the analogous quantities in the limiting case of high strength of a high-frequency electromagnetic field is made.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 95–97, February, 1991.     

Thermal conditions of the Er:YAG laser under stationary diode pumping

Experimental results and calculation data for the thermal conditions of the YAG:Er laser active element shaped as a flat plate under pumping by continuous radiation of a diode array (λ = 980 nm) with fiber output are presented. The thermal field and temperature in the plate optical excitation channel are measured using the thermal imaging technique. Their dependence on the pump power is studied. A comparison of calculated and experimental data allowed the determination of the heat transfer coefficient from the YAG:Er crystal to air under conditions of natural convection.     

Dirac and Majorana neutrinos in matter

We consider the matter effects on neutrinos moving in background on the basis of the corresponding quantum wave equations. Both Dirac and Majorana neutrino cases are discussed. The effects for Dirac neutrino reflection and trapping as well as neutrino—antineutrino annihilation and ν pair creation in matter at the interface between two media with different densities are considered. The spin light of neutrinos in matter is also discussed. The text was submitted by the authors in English.     

Performance of a diode-pumped 5 W Nd3+:GdVO4 microchip laser at 1.06 μm

4 as a host for neodymium has several advantages for diode pumping in comparison with other crystals. The absorption cross section of neodymium in GdVO₄ is considerably stronger and broader than in YAG. This allows for the construction of very compact monolithical microchip lasers. In our paper, we report for the first time on a diode-pumped monolithical Nd³⁺([%at.]1.3):GdVO₄ microchip laser at 1.06 μm. A maximum output power of 5 W is achieved. The temporal and the spectral emission properties are described. The beam propagation properties are studied in detail. Received: 23 July 1998 / Revised version: 9 November 1998 / Published online: 24 February 1999     

An Investigation of the Effects of X-Ray Treatment on the Concentration of Reducing Sugars in Potatos and Their Sprouting

This study investigates the effect of X-rays on potato tubers to stop their sprouting at different periods of storage. It has been found that there is a connection between the period of storage and the dose of irradiation. To control the quality of the irradiated tubers, the concentration of reducing sugars was measured during the entire experiment and compared to the parameters of non-irradiated potato tubers.     

Treatment of Refrigerated Trout with 1 MeV Electron Beam to Control Its Microbiological Parameters

Studies on the radiation treatment of fish products using an electron accelerator with an energy of 1 MeV were carried out. Here, we report the results of the effect of the beams of accelerated electrons with an energy of 1 MeV at the doses of 100 Gy, 1 kGy, and 5 kGy on the viability of bacteria in trout meat. Escherichia coli bacteria present in the fish homogenate were shown to be more resistant to the effect of ionizing radiation than the bacteria which were without a nutrient medium.

     

Spin effects for processes with nonstandard bosons in an external electromagnetic field

A model-independent approach is used to study annihilation of a lepton-antilepton pair in a magnetic field with production of massive scalar and pseudoscalar particles and radiation of massive spinless particles by a charged lepton in a magnetic field. It follows from the investigation that the spin effects of processes initiated by a charged lepton in a magnetic field depend strongly on the type of interaction.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 90–94, February, 1991.