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Wood debarking by means of debarking drums as an energy and resource- intensive process draws intensive interest of researchers. The paper presents an overview of the publications from 1964 up to the present time dealing with the results of research related to improving the quality of pulpwood cleaning by means of debarking drums. The review focuses on technologies of wood drum debarking, mathematical simulation of the process, results of experimental studies both in industrial and laboratory environments. Various methods of mathematical simulation of debarking are cited. A brief analysis is given of the effect that drum proportions, rotation speed and the degree of filling, as well as pulpwood length and diameter produce on the efficiency of the debarking process. The review focuses on cost-effective use of resources in the wood debarking process. The reviewers come to the conclusion that pulpwood interaction intensity and frequency can be used as integral indicators of the raw material parameters and the debarking mode. The efficiency of wood debarking, as well as the magnitude of wood loss are determined by the intensity of pulpwood collisions inside the drum.

The article presents an analysis of pork production problems, ways to improve the production. Based on the analysis of methods and technologies for pigs in small pig farms found that the most promising technologies are the stress-free methods of reproduction, rearing and fattening of pigs. The use of stress-free technology of reproduction, rearing and fattening pigs allows to limit or eliminate the effect of stress on the pigs, caused by forced displacements and rearrangements between the phases of the process. This allows for better productivity of the animals and thus shorten the duration of growing pigs to marketable weight. Provided a detailed analysis and describes the requirements for the five-phase stress-free technology of reproduction, rearing and fattening of pigs. Based on the established structural modeling scheme five- phase stress-free technologies have been developed graphical models of growth and weight gain of pigs. Received graphical model allowed to define mathematical models of growth and weight gain of pigs, in the form of polynomial functions of the 3rd and 2nd order, respectively. A brief description of the comprehensive mechanization and experience in the design of the object implementation five-phase stress-free technology for pigs - pig for reproduction, rearing and fattening 500 pigs per year.