Vol 17, No 4 (2014)

Weak electromagnetic signals from sufficiently distant sources reveal quantum properties. The latter ones result that detection of the sources becomes probabilistic. The analysis of received quanta intensity spectra permits to evaluate the limit (by finite exposure) of distance of detection of definite class heavenly body. By the quantum interpretation of the background radiation experimental results the maximum frequency temperature (the Wien’s law) decreases in 1.77 times. In such a case the background radiation absolute temperature would to be changed from 2.73 to 4.83 degrees.

In the article it is researched influence of weight vector jitter on the statistical characteristics of adaptive antenna array with nonlinear function in correlation feedback, tuning on LMS algorithm with quadratic constraint. It is shown, that weight vector jitter leads to distortions of adaptive antenna array statistical characteristic (correlation function of output signal, output power, correlation matrix of weight vector jitter).

With use of criterion of a minimum of average risk and estimates of maximum likelihood of same parameters synthesis of algorithm of multi-alternative identification of objects by in common functioning monitors in the conditions of aprioristic uncertainty of signs of identification is executed. Statistical characteristics of efficiency of an identification of the purposes by results of independent measurements of their coordinates are investigated.

Features of ranges of absorption in concerning the magnetized single-crystal films ferroshpinely, the chemical transport reactions received by a method are considered. Existence of range of frequencies of superficial and volume magnetostatic fashions is established. The cumulative observed effect for films ferroshpinely are ostsillyation of attenuation of absorption of magnetostatic fluctuations with frequency change. Dependence of a picture of ostsillyation of attenuation on fixing parameter спинов and sizes of a constant of superficial anisotropy is found. Features in attenuation are a characteristic sign of resonant interaction of dipolar and exchange waves. Wave numbers, fixing parameters спинов, and constants of a non-uniform exchange are calculated.

The prototype of single-chip light-to-frequency converter is described. This converter is a mesa-planar photoresistor structure based on high-resistivity gallium arsenide with an N-shaped current-voltage characteristic. The converter functionality and utility for optoelectronics are showed. The main characteristics are indicated. The advantages and limitations of the proposed converter under the present analogs are analyzed.

The reasons of angular photon distribution occurrence at electron-positron annihilation are considered. It is shown, that angular photon distribution is consequence of Doppler’s effect in the reference frame of the electron and positron mass center. In the reference frame bound with moving electron the angular photon distribution is absent. But it is replaced by the Doppler’s shift of photons frequencies. The received results are applied to the analysis of a positron-emission tomograph work.