Chemical analysis of flux-cored wire NR-207 deposited metal by a method of optical emission spectrometry makes it possible to determine the influence of the composition of flux-cored wire NR-207 on the emission and chemical composition of the welding aerosol. Chemical composition of deposited metal is a complex index of chemical composition of metal cover and wire core. Such dangerous substances as compounds of manganese, fluorine, aluminum, nickel, and fluorinated gases are released during welding with wire NR-207 into the working space of a welder.

The aim of this paper is to evaluate the scale factor influence in the modeling of shockproof clothing on the basis of an alloy with shape memory effect. The article considers technical possibility of extrapolation of experimental results to other objects to generate the initial data of the mathematical model for dynamics of elastic-plastic deformation of the shockproof device with similarity of features of the external loading.

The article considers modelling of the simplest elementary link of a local electronic collector of drops of electrolyte, ejected from a galvanic bath in the process of chrome plating of metal parts. Modeling with the use of regression analysis reveals the most significant factors of the technological process and contributes to the development of effective models of above-surface electronic collectors of droplet entrainment and to determination of the optimal ratio between the design parameters and the mode of electronic collection.

The aim of this work is a theoretical study of noise emission processes created by total acoustic system of overhead cranes in production areas. The paper provides analytical dependencies of sound pressure levels at industrial personnel workplaces. The expressions of octave sound pressure levels take into account the acoustic characteristics of the main sources of the cranes themselves and the parameters of the production premises.

In the derivation of theoretical dependencies the main methods of technical vibroacoustics were used. The results of the study are the basis for selection of engineering solutions to ensure sanitary norms of noise in industrial areas.

The aim of this work is the search for methods of integrated assessment of occupational injuries at enterprises of mechanical engineering of Rostov region. The paper discusses the main approaches to risk analysis. It provides qualitative and quantitative methods for assessment of production risk, classification of methods of analysis and risk assessment.

The article provides the results of technical expertise of the eccentric shaft of jaw crusher SMD-111. The authors describe the technical expertise procedure to establish the cause of fracture of the shaft which is used to convert rotary motion into reciprocating one and to transmit force through the toggle plate to the movable cheek, which is a working body of the crusher. The analysis of source materials and the report on the fraction cause of eccentric shaft of jaw crusher SMD-111 are provided.

The paper provides the development results of the method for animal feedstuff production from alfalfa cormophyte mass waste using lactobacillus cultures. The article shows the chemical composition and energy content of the resulting feedstuff. These results led to the conclusion that a combination of mechanical dewatering of alfalfa plant mass to 60% of humidity followed by the introduction of lactobacilli cultures produces good feedstuff for ruminants. The authors have found out active and directional influence of lactobacillus cultures strains on microbiological and biochemical processes in the preserved alfalfa green mass, the suppression of unwanted microflora development, creation of the conditions for long-term storage of nutrients and biologically active substances in the feedstuff. The produced product meets the 2nd class haylage requirements to energy and nutrition value and the content of fermentation.

The article deals with the processes of complex waste water treatment, which are carried out with the sets of hair brushes and aeration, taking into account the hydrodynamic resistance of brushes to liquid stream with the definition of brushes sticking time. The simplified physical and mathematical model which considers liquid as elementary liquid cubes was developed for the calculations. These cubes interact with hair brushes and air bubbles resulting in the removal of impurities. During the study it was found that the number of hairs per unit volume and density of air bubbles greatly affects the stepping rate of impurities. It was established that it is necessary to consider the hydrodynamic resistance of brushes for a flow velocity more than 0.2 m/s. All the proposed calculations make it possible to design new devices and to upgrade the existing ones to provide a high degree of purification of liquid medium with the help of straining and aeration and to facilitate their maintenance.