Increase of axle load and wagon numbers of heavy haul train would generate larger longitudinal train impulse in the condition of shunting impact, and it beaker creatures series 1 would result in some dangerous problems.On the basis of draft gear dynamic modification model, the vehicle impact equation and vehicle-coupler-vehicle series model, the ef
The white gold new victory theater aim of the research was to determine the role and significance of natural, economic and social conditions influencing the development of family farms keeping animals of conservative breeds in conditions of sustainable agriculture.Family farms are conducive to the sustainable development of agriculture, particularl
The paper presents orion bar key west partial overview of the mathematical synthesis and the physical realization of metasurfaces, and related illustrative examples.The synthesis consists in determining the exact tensorial surface susceptibility functions of the metasurface, based on generalized sheet transition conditions, while the realization de
In this paper, data of almost 8 million loans of books recorded for 15 years by the Korea University Library are analyzed by using big data analytic techniques.During this period, book circulation decreased with an average annual rate of decline of 4.4%.The use factor of books in each Dewey decimal classification (DDC) class was evaluated to measur