Sulphur (S) cycling and implications on S fertilizer requirement in sheep-grazed pastures receiving three levels of S fertilizer at rates of 0, 30 and 60 kg S/hm 2 in 1995 and 1996 were studied using a mass-balance approach which accounted both for S inputs to and outputs from the soil-plant-animal system.

Second,based on the comparative analysis of the calculating methods of the stability indices,such as segmentation equilibrium method,summation equilibrium method,horizontal projection method,and so on,the practical si.

Applying theory of rotor balancing, the paper analyses the main facets of balancing processing how to select the number of correcting plane, confirm the position of correcting plane and select balancing technique, offers guidance for tooling system's designing, manufacturing and using.

Reason and balance method of the axial propulsive force of the centrifugal pump;

The characters,advantages and system composing of workshop dynamic balance method are introduced,the test princi- ple and balance method of workshop balance are emphasized discussed in this article.

The feasibility of the balance method was verified through test.