A model of the two‐phase structure of a metal is proposed to explain the experimentally deduced decrease of the Curie temperature and saturation magnetization in submicron‐grained nickel. One of the phases is the grain body phase which has a Curie temperature traditional for the given crystalline material. The other is the grain boundary phase the Curie temperature of which is much lower. When the specimen temperture rises, the grain body phase is transformed into the grain boundary phase, i.e. due to this transformation the submicron‐grained Ni specimen goes over into the nonferromagnetic state at a temperature lower than the Curie temperature of crystalline Ni.

Currently, the problem of environment-focused use of resources in the agricultural enterprises relevant, as one of the ways to meet the resource requirements is the use of secondary resources. The article presents the results of the analysis of lubricants consumption by agricultural enterprises of the Rostov region. On the basis of the information processing array data on the qualitative and quantitative state of machines and tractors park of agricultural enterprises of the Rostov region developed a conceptual model of a closed secondary resources cycle, assuming the implementation of the rational use of secondary resources scenarios, based on environment-focused approach to the consumption of lubricants. This article demonstrated the results of the analysis of the scenario approach to the use of secondary resources, such as waste oils. For each scenario identified the alleged economic and environmental effects of the regeneration of waste oils and their uses. In conclusion, the authors provide recommendations for the development of technological capabilities of agricultural enterprises based on environment-focused approach.

No abstract

No abstract

No abstract