By using the technique of Structural Decomposition Analysis,this paper calculates the structure share and efficiency share in the change of labor intensity of coal mining during the period 1985~2006.

5/29 hydraulic support,knocking at vat of push jack could be passed away,lift end of piston bar could not be knocked deformed,assemblage of pressing tray could not be affected,labour intensity of workers could be mitigated,productivity could be raised.

The article sites test prop-setters' labour physiolgicai parameters on mechanized coal face and simulates the impact on operators by climatic load and labour intensity.

After long and hard studing of the question,the author comes tothe conclution that the surplus value production caused by increasing of labour intensity be-longs to the absolute surplus value production.

Through its application in the flowsheet of cyanidation CIL,the disadvantages of arc and trommel screens were overcome,the labor intensity was lessened,the production cost dropped down and the process flow was stabilized,thus creating favorable conditions for improving technical index.

In order to improve the logistics,raise the efficiency,reduce the labor intensity,the authors improve the machining process of the bus iron side compartment doors.

The labor intensity and the fatigue are one of the important contents of ergonomics.

8σf,σf the dynamic fatigue strength, thediscrepancy between the dynamic fatigue strength measured by the preloading thechnique and thetrue dynandc fatigue strength of specimens can be neglected.

Objective: To explore the physical labor intensity condition of train s crew in the plateau with low pressure and oxygen deficiency enviroment, and to provide scientific evidences for making reasonable employing labor system,the work norm and the welfare treatment,and for safeguarding the railroad driving personnel s health and the traffic safety.