Abstract In areas with a pronounced relief, water erosion causes great harm to agriculture and other sectors of the national economy. It leads destruction soil cover, reduction in area arable land, decrease fertility, removal products into floodplains, siltation ponds rivers road network. The scientific goal was identify influence main natural factors (snow reserves, freezing moisture) on forma...

Plow pan is one of the main obstacles to high production agricultural plants in Chongqing, China. As a minimal tilling method, subsoiling can break plow and help growth plants. There are two methods: vibrating (VS) traditional (TS). A soil model with upland field features Chongqing was established for DEM-based simulation. The simulation validated by experiments, items looseness, coefficient di...

In this paper we describe an Interior Point Method (IPM) to solve large scale NonLinear Programming (NLP) problems, tailored to the solution of a specialized Optimal Power Plow (OPF) formulation that uses bus voltages in rectangular coordinates. The distinctive feature of this OPF formulation is that the objective function and constraints are quadratic functions, and such quadratic properties a...

Preliminary reports of part of this work have appeared in abstract form in Clin. Res. 26: 503A, 1978, and in Blood. 54(Suppl. 1): 241a, 1979. Dr. Gerrard and Dr. Plow are established Investigators of the American Heart Association. Reprint requests should be addressed to Dr. Gerrard, Manitoba Institute of Cell Biology, Manitoba R3E OV9, Canada. Received for publication 15 November 1979 and in r...

The paper studies the direction turnover layers along slope and placement of working bodies on a plow for plowing fields. diagrams layout are given. It is proved that intermittent grooves ridges, according to agro technical requirements, it necessary rotate downhill. was found when installing cut-out spherical disk behind front cases, groove formed above under it. subsequent layer wrapped in an...

The pick is the working part of coal plow, cutting performance very important for efficient production mine. In order to analyze dynamic characteristics plow during process, a test platform was built. force and vibration head were obtained through test, relationship between speed depth analyzed. study influence different alloy shapes on pick, two kinds designed: with chip bit conical bit. finit...

ated with soil type, vadose zone flow and transport processes are also affected by such external factors as tillage Vadose zone flow and transport processes are known to be strongly practices. For example, Petersen et al. (1999, 2001) affected by both soil structure and soil texture. We conducted a field experiment to explore the impact of heterogeneity in soil structure showed that surface til...