Theoretical and experimental research results in the field of high-performance microwave technologies of sheet materialsare presented. Sections of two-dimensional periodic slow-wave systems are used as heating elements. Divergence of theoretical and experimental temperature distribution characteristics in the sheet material does not exceed 3%, and the temperature deviation in the material from the nominal temperature value does not exceed 5%.
In this paper we analyze details of bipolar transistors and MOSFETs electrical characteristics measurement in the presence of neutron, electron and gamma irradiation. An automated measurement subsystem is developed with its core being a measurement kernel comprising a set of measurement instrumentation as well as methods of measurement and data processing for irradiated transistors of various types. Provided are several examples of the subsystem application to BJTs and MOSFETs radiation hardness investigation as well as extraction of their SPICE model parameters for circuit design.
The intellectual three-channel frequency-code converter with high vitality is considered. Autodiagnostics and autocalibration of converter are performed without current convertions interruption.
A method for constructing traveling wave type microwave device with a transverse interaction, forming a uniform temperature distribution over the volume of polymer composite rods is proposed. The results of theoretical and experimental studies of the temperature distribution of the rod material are presented. Advantages of microwave technologies of curing of polymeric composite materials in comparison with traditional methods are shown.
We described the problem of time intervals measurements when transfer the signal from reference frequency standard. The technique of correlation measurements is described. We suggested and described the time intervals measurement method based on a technique of search and elimination of errors associated with the processing of large volumes of information in the process of data acquisition.
The problem of measuring temperatures of printing unit electo and radio elements has been studied/ The temperature sensor (thermocouple) and possible sources of error and considered/ The merhod of systemetic errors compensation for assurance of required accuracy of elements temperature measurment by means of temperatur sensor is proposed.
A new approach to the metrology of optical measurements - the quantum metrology of photons is proposed. The specific character of measurements of the quantum states of polarization of single photons and polarization-entangled photons is considered. The basic problems standing before the contemporary metrology of photons were formulated.
The methods of biomechanical systems design with artificial elements are analyzed. The data of high-precision measurements of all set of the biometric characteristics, determining of biomechanical system is a basis of mathematical model. The calculations allows to predict complications at denture installation.
Mathematical model of multichannel sensors unit based on diamond detector elements of cosmic radiation fluxes parameters monitoring module has been developed. The simulation of output of the multichannel sensors unit registering cosmic space ionizing radiation at different spaceship orbits under different sun activity has been carried out. The work was supported by the Ministry of Education and Science of the Russian Federation (unique identifier RFMEFI 60514Х0001).
A computer model and the results of a numerical experiment for a sensitive element on a planar mushroom-shaped metamaterial with cells of the "Maltese cross" type are presented. The proposed electrodynamic structure is shown to be applicable for non-destructive testing of geometric and electrophysical parameters of technological media, as well as searching for inhomogeneities in them. Resonant frequency shift and change of the attenuation coefficient value of the structure serve as informative parameters.
Efficiency of optimal static posledovatenyh criteria for weak signal detection in background noise when the signal and the noise distributed Rayleigh. The comparison criteria by mathematical modeling
The method of partially depolarized dynamic light scattering is applied to measurements of gold nanorods dimensions in liquids using translational and rotational diffusion coefficients. Compared with known method we have possibility to limit the power of the laser and increase data set for inverse problem solution. Results of lengths of nanorods calculated from diffusion coefficients are in agreement with TEM data. Aspect ratios calculated from plasmon spectrums are more in agreement with TEM.
Analytical expressions for determining the complex slowing factor and reflection coefficient are obtained using a general form of the dispersion equation of the slow-wave system and taking into account the properties of the medium surrounding it. These parameters can also be measured experimentally. It is shown that the determination of these quantities enables a simplified analysis of the transformation of waves, and the structure and space charge of the electron beam in microwave devices with prolonged interaction to be carried out, using the example of a waveguide model of a traveling-wave tube.
The developed model of cell slow-wave system type chains of linked resonators with adjacent channel filled with plasma, using the method of equivalent systems. This model represents the octal-pole, which is used for determination and calculation of electrodynamic characteristics. Calculations show that the introduction of plasma allows to extend the working width slow-wave system and increase the coupling impedance.