In this paper, LDPE/CaCO 3 blends and LDPE/SBS blends were mixed by disc mixing extruder and single screw extruder, and dispersion degree and unifromity of blends were studied by micrograph and photograph analysis set.

By analysis of naturally observed sediment typical gradation, the relationship between the heterogeneous degree parameter d50/dcp and the gradation and content of sediment is set up.

Through nonlinear finite element analysis,this paper discusses the load distribution state of crowded shear stud group,the factors influencing the uneven level of the shear force of shear studs are analyzed.

Analysis of relationships among different parameters of irrigation uniformity in fully-compensated micro-irrigation system;

Experimental research on drip irrigation uniformity at low-pressure

Furthermore,a mathematical equation of irrigation intensity and uniformity of the menbrane hole irrigation has also been abtained and the conflict of irrigation uniformity and extending length is solved.

The application of the BP model shows that the simulated efficiency of the application Ea and the distribution uniformity DU from two models have similar variatio.

Field experiments were conducted to investigate the influences of border dimensions and irrigation variables on the performance of water advance under straw mulch,irrigation efficiency and distribution uniformity(DU).

For a typical field, the resulting performance parameters, such as application efficiency and distribution uniformity were appreciably reduced with increase in the standard deviation of field surface elevations (S d), which was used to evaluate the land.