The representation of solutions for problem of steady state vibrations of multilayered poroelastic half plane is considered using the superposition of corresponding solutions for homogeneous poroelastic environments. This allows to analyze the influence of individual structural layers on the forming of displacement and stress fields and also give the analysis of energy streams with the refraction boundaries and wave types separation

Keywords: multilayered half space, steady state vibrations, Biot environment, superposition principle

A compact digital voltammograph for electrochemical analysis of aqueous solutions was created. Device’s construction and drawings of the electrochemical cell for the studying of small amounts of fluids are described. Electronic circuits are assembled on modern high-precision components. The device implemented using cyclic, normal pulse and differential pulse voltammetry. Experiments were carried out with solutions of copper ions and hydrogen peroxide to test operability and characteristics of the voltammograph. All implemented methods gave reproducible results that are consistent with the theory. Typical results of the experiments with solutions of copper ions are shown.

Keywords: voltammetry, voltammograph, voltammogram, electrochemical cell, analysis of solutions

  The purpose of this work is identification of optimum methods of an as-sessment of a resistance to stress in work of the modern organizations of a services sector. This article considers the major factors influencing effective work of the personnel in a services sector under the influence of various stressful situations.  Categories of the workers who are most subject to psychological instability on workers are defined.   

Keywords: resistance to stress, testing methods, service economy

Information about authors of issue №4 (2013)

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The article describes the three main causes of marriage exactly litena production. Suggests ways to address them. 
Keywords: Marriage in precision casting, a type of marriage, the reasons for marriage.

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