A dynamical theory of the reflection and transmission of X-rays through a layered periodic target with three different layers in the period is developed. Expressions are obtained that describe the parameters of dynamic scattering determining the reflection and absorption of X-rays. Expressions are derived for the coefficients of the reflection and transmission of X-rays through a periodic layered structure. It is shown that by changing the ratios of the layer thicknesses and the values of the dielectric susceptibility of the media in the layered structure, it is possible to increase significantly the reflectivity of X-rays in the vicinity of the Bragg frequency. When the middle layer has weakly absorbed X-rays, the effect of anomalous photoabsorption could occur, which is similar to the Bormann effect in a single crystal.

The work investigates the diffracted transition radiation of a relativistic electron crossing a single-crystal plate in the Bragg scattering geometry. Expressions are obtained that describe the spectral-angular density of diffracted transition radiation with and without the multiple scattering of the relativistic electron in a single-crystal plate taken into account. The influence of multiple scattering on the spectrum of diffracted transition radiation of the relativistic electron is shown.

The article presents the methods and results of the analysis of the movement of a modeling manipulator such as the Hugh-Stewart platform using Adams-Matlab in order to check and develop a possible trajectory of the working body. Application of Matlab Simulink for solving kinematics problems: determining the extension length of rods along a given trajectory of the movement of the working body. A feature of the Simulink application scheme is the export of physical and mechanical parameters of a solid model from Adams. Mutual integration of Matlab Simulink and Adams View evaluate the implementation of the possibility of implementing a kinematic, comprehensive and force analysis of the mechanism, taking into account its design features due to the use of an apparent prototype. The proposed method of joint modeling is presented in the form of a detailed description of the content of Simulink circuit blocks, their interaction in modeling, the exact mathematical apparatus and the conditions for implementing mutual thoroughness of the Matlab and Adams software packages. The technique was tested on the ascent from constructive platforms while moving along a sexual character such as a given trajectory. The results of a computational experiment are proposed and an analysis is made of the coordinate correspondence of the actual trajectory obtained as a result of modeling in joint simulation with the initial given trajectory for various types of motion.

Parametric X-ray radiation generated by a beam of relativistic electrons in a single-crystal wafer is studied in the Bragg geometry under conditions of multiple electron scattering at target atoms. Expressions are obtained that describe the spectral-angular and angular radiation density under conditions of multiple electron scattering. An increase in the influence of multiple scattering on the spectral-angular radiation density is demonstrated both with an increase in the target thickness and a decrease in the energy of relativistic electrons. It is shown that the asymmetry of the electron-field reflection relative to the target surface considerably affects the spectral-angular and angular densities of parametric X-ray radiation under the condition of strong multiple scattering.

A theory of coherent X-ray radiation generated by a beam of relativistic electrons in a single crystal in the direction close to the electron-beam axis is developed in the Laue scattering geometry. The theory takes into account asymmetry of the electron-field reflection with respect to the crystal surface and the electron-beam divergence. Expressions describing the spectral-angular densities of parametric X-ray radiation near the electron-velocity direction, of transition radiation, and their interference are obtained. The influence of the electron-beam divergence and asymmetry of the electron-field reflection with respect to the target surface on the spectral-angular radiation densities is studied.

A method of nondestructive examination of the state of cooling microchannels of heavily loaded turbine blades by measuring the speed of an exiting aerosol-containing air flow using a continuous-wave coherent Doppler lidar is described. A mathematical model by use of which optimum values of parameters of gas-generator and lidar systems are determined is developed. The effect of the diameter of aerosol particles on the backscattered power is studied.

The paper describes a method of non-destructive quality control of manufacturing ventilating pinholes by measuring the speed of an expiring aerosol-containing air flow using a coherent continuous lidar. A mathematical model is developed, with the help of which the optimal values of the parameters of the gas-generating and lidar systems are determined. The effect of the diameter of aerosol particles on the backscattering power is investigated.

Статья отражает поиск некоторых закономерностей развития адаптации к нагрузкам, определяющим физиологические показатели двигательной функции юношей – бегунов на короткие дистанции 14–15 и 16– 17 лет, а также наличия степени информативности этих показателей для выявления предварительных критериев в оценке эффективности восстановительных микроциклов подготовительных периодов юных спортсменов.

The article represents essence of experimental researches directed on the study of process of development of general and special capacity under influence of unloading restoration microcycles for youths-sprinters 14-15 and 16-17 years in the annual loop of training during two setup times. Definite certain regularities of movement general and special capacity and optimality training loads of regeneration microcycles.