No abstract

An analysis is presented of the impedance of a “long” p+‐n‐n+ structure of a semiconductor, compensated with impurities, forming deep doubly ionized acceptor levels in the forbidden gap, for a small alternating signal. Numerical calculations are made in the case of Si〈Zn〉 structure.

The paper touches upon a newly developed methodology for determining the automobile physical wear coefficient, taking into account some technological factors during operation that compose the rolling stock life cycle in the given operating conditions. A concept for determining the operation period of an automobile has been proposed based on maintaining the smooth operation of the rolling stock throughout the life cycle. The quantitative and qualitative indicators of automobile physical wear are determined aimed at solving the problem. The theoretical and scientific experimental research has identified the analytical connections of their interactions and relations. Given the stochastic nature of physical wear coefficient variations, it has been considered as a random value, and the characteristics of its variations pattern have been determined.

The efficiency of commercial automobiles and wheeled military vehicles mainly depends on the choice of maintenance (M) and current repair (CR) concept. In the paper the difficulties of adapting the (M) and (CR) planning strategies to the structural characteristics of modern transport facilities are pointed out. The advantages of using the (M) and (CR) random strategy for transport facilities based on the stochastic nature of failures and malfunctions are substantiated. Considering the failures and malfunctions as random values and identifying the patterns of their distribution based on γ percentage resources, it is proposed to develop a list of regulated maintenance and repair work, periodicity and labor intensity based on a random strategy, which will increase the efficiency of preserving the technical resource of the rolling stock throughout the entire life cycle of the vehicle.

No abstract