A Simulated Study about Runoffand Sediment Transportation on Channel of Loess Plateau Small Watershed;

The distribution of the high electric field and each parameter influencing the electric field are analyzed,two principles of designing the channel are proposed——lengthening the channel while lowering its impurity concentration.

The physical properties of two dimensional electron gas in the quantum well of the GaAs channel layer for AlGaAs/GaAs HEMT were discussed by using the two dimensional numerical simulation.

Machining raceway of outer ring with reformed M2110A;

The optimizing design of lemon form raceway has been made and constrain condition of raceway and contact pressure angle has been determined by mathematics analysis,the two main parameters of similar coefficient C p and load rating k have been determined by calculating contact stress.

When turning the double raceways of 3200ATN series bearing inner ring, because of the influence of ID verticality, the wall thickness difference of the second raceway has outrun the technology request.

Improvement of implement of lapping machining with grooved raceway of ball bearing;

Super-finishing method on grooved raceway of angular contact ball bearing with two-piece ring;

Analysis of grinding method of ball bearing grooved raceway;

The result indicated that the soil organic matter content in the gully with seabuckthorn flexible dam is much higher than that without the flexible dam.

)in l963～1969,the basic features of the rainfall and gully runoff-sediment yield process inloess plateau region are statistically analyzed.

Effect factors analysis of surface roughness of bearing ring groove;