Reactions of amidines with oxalyl chloride. II

Unsubstituted, N-alkyl(aryl)- and N-chloroamidines react with oxalyl chloride to form imidazolidine-4, 5-diones. The hydrochlorides of 1-aryl-2-alkyl(aryl)imidazolidine-4, 5-diones decompose thermally to give N-arylimidoyl isocyanates which change immediately to 4-quinazolones.     

High-Frequency Magnetoresonance and Magnetoimpedance in Co/Cu Multilayers with Variable Interlayer Thickness

The paper is devoted to the investigation of high frequency magnetic features of multilayered metallic structures (Co/Cu) demonstrating the Giant Magnetic Resistance effect (GMR-effect) and Giant Magnetic Impedance effect (GMI-effect). Dynamic features have been investigated in dependence on the distance between magnetic Co-layers and analyzed in comparison with static magnetic features. Ferromagnetic resonance response as well as non-resonance magnetoimpedance at small applied static magnetic field have been studied. Experiments were carried out at room temperatures in frequency band 20-37GHz for the ferromagnetic resonance technique and in frequency band 30-140GHz for study the low field non-resonance magnetoimpedance effects.     

Determination of Microwave Parameters of Isotropic Mediums by Using an Open Quasi-Optical Spherical Resonator

The technique for determination of dielectric parameters of substances is submitted on a base of using a high-Q whispering gallery oscillations in a quasi-optical spherical resonator. The function ability of a method is shown on an example of measurement of permittivity for several substances in the 8 mm wave band.     

Millimeter Wave Antenna with Scanning Beam

The results of theoretical analysis and experimental investigation of the millimeter waves antenna with scanning beam are presented. The operation concept of the antenna is based on the effect of transformation of the surface waves of dielectric waveguide in the volume waves. The smooth space scanning of beam has been made by means of change of wave propagation constant inside of the dielectric waveguide. All experiments were made in the four-millimeter wave range. The angle of scanning was =35° and width of directional diagram was 2° in the scanning plane. The lens and the mirror antennas were designed.