Vol 18, No 3 (2015)

We have considered a questions associated with the analysis of the spectral characteristics of fiber Bragg gratings and periodic radio frequency in coaxial cable systems with uniform periodic structure containing a discrete phase shift. These fiber gratings are designed for measurement of temperature, linear and bending tension and allow by 1-2 orders increase their resolution. Shows the effect of increasing the sensitivity of electrophysical parameters definition using Bragg structures with a phase shift in the coaxial cable.

An approach of inertial influences plasma stabilization in the lasers fusion targets is considered in that paper. It is showing that the suggested approach allows to do analyze processes in targets by common positions. For example, the slowdown of local instabilities in the plasma targets, provide the required time laws of energy flux density change for sustained compression and heating of the target, to solve the inverse problem of plasma stability with detection of the desired material density distribution and additives in ablative and working layers of the target.

With use of criterion of a minimum of average risk and estimates of maximum likelihood of the same parameters synthesis of optimum algorithm of an identification of the objects revealed by in common functioning monitors in the conditions of aprioristic uncertainty of signs of identification is executed. Its quasi-optimum modification allowing to reduce the sizes of massifs of signs of identification due to establishment of a priority of the purposes with the maximum conditional probability of an identification is received. Statistical characteristics of efficiency of an identification of the purposes by results of an assessment of their coordinates are investigated by various monitors.

We have studied the possibility of using single-layer boron triangular and alpha-structured nanotubes as substances with proton conductivity. Proposed and studied various ways to the migration of a proton on the surface of single-walled nanotubes in the implementation of the two possible mechanisms of migration - hopping and step-by-step. We conducted semi-empirical quantum-mechanical calculations of the proton transfer process on the outer surface of boron nanotubes and constructed surface profiles of potential energy, which allowed us to calculate the activation energy of the proton hopping from one boron atom of the surface to another. This feature can be used to obtain the dependence of the nanotube relative conductivity from the temperature.

Analysing Feynman integral for one-dimensional harmonic oscillator we have found that it is possible to introduce quasiparticle of radio systems. This quasiparticle we have called «radion». One can understand «radion» as object moving along fractal trajectories in phase space of oscillator. The same arguments have led us to the conclusion about ‘natural’ fractality of all radio systems working with spectrum of signal. Under radiation of electromagnetic wave into medium with arbitrary dielectric permeability radion continues its fractal movement. Interrelations of radion and photon also have been discussed.

The paper deals with the methods of nonlinear distortion compensation for even and odd orders in the output of multistage amplifiers for radio receivers. The essence of the method is using the additional re-interactions of the base frequencies with the second harmonics and combinations to neutralize the unwanted spectral components. The optimal configuration of the dual-channel amplifier circuits FET is suggested for the simultaneous suppression of the second and third order intermodulation distortion. The advantages are shown to compensate the third order intermodulation products in the final summator relative to their minimization in separate channels.

The device for leakage current protection in three-phase network without neutral terminal feeding powerful radar station supply system was designed and developed. The device for insulation resistance measuring in three-phase network without neutral terminal with capacitors having 1200 uF at all for asymmetrical interference filtration was designed and developed. There are not such devices in Russia.