Coating structure formation under magnetron spraying of titanium and carbon cathodes and combined cathodes, namely cobalt (EP 131) – nickel, tungsten – carbon have been investigated under conditions of carbide separate synthesis within the temperature range of 650–1200 °C. Usage of cobalt and nickel particles as matrix material leads to their rapid thermal expansion under heating during sintering process in the dilatometer. Subsequent plastic deformation of sintered samples provides obtaining a composite powder material that is a composite with framing structure of cobalt, titanium and tungsten carbides in the coatings.

The paper presents an investigation and a comparative analysis of wear resistance of boride coatings using newly developed composite powder media and an out-of-furnace metallothermy method. Recommendations on their usage in relation to loading rate are given in the paper.

The paper presents results of investigations on structure and mechanical properties of technological equipment elements made of heat-resistant steels. A scale of chrome and molybdenum steel microstructure degradation based on evaluation of  coagulated carbide size and material mechanical properties (a point from 0-operation without time limits, up to 4-operation prohibition) has been proposed in the paper. It has been  established that an analysis of  steel microstructure directly on equipment elements by means of a portable microscope is an efficient express method for evaluation of equipment condition and structures due to control of material structure degradation rate of a diagnosed object.

The paper considers peculiar features of artificial diamond powder synthesis process and also direct and indirect methods for temperature measurement in a reaction cell of high-pressure apparatus. Differences in temperature regimes of diamond synthesis associated with time fixation of strain and heating power have been analyzed in the paper. The paper  reveals their impracticability.

Theoretical methodology for temperature correction in the reaction cell has been proposed in the paper. An algorithm controlling cell material heating has been developed on the basis of a microcontroller and it makes it possible to stabilize temperature in the reaction mixture that permits to improve quality and strength characteristics of the obtained diamond powders. The paper contains a graphic interpretation of calculation results with the help of the proposed algorithm.

 

The paper presents investigations of processes pertaining to surface charge accumulation and running of fluoropolymer-4 products using vibrating capacitor method. Modification of a measurement technique allowing to register distribution of dielectric surface potential without disturbance of the surface charged state has been described in the paper. The paper contains graphics of spatial distribution of surface potential of fluoropolymer-4 products after various treatments. The paper reveals that thermal treatment (tempering) reduces static characteristics of fluoropolymer-4.

The paper proposes methods for treatment of oncological diseases while applying ultrasound as an independent method and modifier of radiation therapy.

Experimental and clinical investigations show effectiveness of ultrasound as an independent remedy against malignant tumors and its usage in combination with other anti-tumor agents. However combination effect of ultrasound and radiation on malignant neoplasms and mechanisms of radiation-sensitizing action of low-frequency ultrasonic radiation is still understudied. Influence of ultrasound input direction in malignant tumor zone has not been investigated yet and there are no rational designs of waveguides for controllable vibration impact on skin neoplasms.

The paper presents a thermodynamic model reflecting interrelation of information and energy characteristics  pertaining to the  process of an intellectual  sensor  system  operation.  Sequence of parameter transformations has been analyzed in the process of sensor control while using the sensor with self-generation and without it. It has been shown that while executing high-accuracy control data amount is determined by relative accuracy algorithm and while carrying out rough control of physical values the given parameter depends on relative accuracy square. The paper contains a dependence of enthropy efficiency value of sensor control on its relative error. Evaluation of energy complexity pertaining to the execution of the given procedure has been analyzed for thermodynamic model of sensor data processing. The paper proposes a thermodynamic model where an input signal is realized in the form of separate energy abrupt changes and reveals the possibilities to reduce energy complexity of data process in the sensor control

The paper contains calculations of  interaction energy for different functional groups of chemical additives with hydrated tricalcium silicate.

The paper presents analytical dependences for calculating water reduction effectiveness of plasticizer additives and super-plasticizer C-3 with due account of molecular dipole moment value, additive and cement consumption in the concrete mixture.

The influence of adding carbon nanomaterials (CNM) to a cement stone on mechanical properties of the latter has been studied. Two test methods have been applied: nanoindentation and ultrasonic testing. Results obtained show that there is some uncertainness on influence of CNM on mechanical properties of cement stone due to deviation of measurements.

 

The paper proposes a supportive maneuvering device for course reversal of a wheeled tractor unit on a smooth flat ploughing, its novelty is proved by a patent for an invention. Application of the supportive maneuvering device does not require any changes in design of commercial tractors. Theoretical and experimental investigations have been carried out in order to determine moments of resistance to course reversal according to minimum radius and time for such manouevre.

Safety provision for the operated auto-transport facilities is of great significance all over the world. The problem is also considered as an actual one for the automotive transport of theRepublicofBelarus. Provision of higher brake system reliability for the operated vehicles is one of the directions to solve the problem pertaining to improve traffic safety.

The paper contains an analysis of basic national standard documents which regulate brake characteristics for the operated vehicles, evaluates checking methods of braking efficiency and vehicle stability at the moment of braking, considers some problems pertaining to methods used for checking and estimation of braking control systems of transport facilities.

 

A theoretical analysis of colmatation regularities pertaining to high disperse particles from gas streams in various porous materials has been carried out in the paper. The paper reveals that under usual conditions the colmatation efficiency of high disperse particles having diameter 0.5 microns and less basically depends on a stream velocity and size of  filter fibers that is higher velocity and larger fiber diameter entail lower colmatation efficiency. An increase in density of filter material packing makes insignificant impact on the rate of particles catching but leads to growth of resistance and correspondingly to reduction of the filter productivity. A joint action of diffusion mechanisms, a contact, and partially inertia is observed at high stream velocities.

An equilibrium condition on a wedge-type counterpart without external stresses and with approaches of dislocation mezoscopic model has been derived in the paper. The paper describes balanced length dependencies of the wedge-type counterpart on forces that resist to motion of twinning dislocations.

A mathematical model for  calculation of a jet power impact on a barrier consisting of a corrosive deposit layer  has been proposed on the basis of an upper-bound method and accepted assumptions. A variational problem associated with determination of a minimum destruction pressure has been solved and a theoretical dependence for pressure calculation at the point of jet-barrier collision with due account of mechanical properties of the destroyed material and kinematic jet parameters has been obtained in the paper. Comparison of experimental data obtained by means of the EDP-30 sensor with the theoretical ones has shown a divergence of 15–19 % within velocity range of the jet impact from 150 to 300 m/s.