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Based on the gently inclined medium thick phosphate rock of the deep part of the east mining section of +2150 level of Jinning-Six mine of Yunnan phosphate Co., Ltd, the similar simulation model experiment of the stability of stope roof under cemented backfilling mining of waste rock was carried out by the mine pressure plane stress modeling experimental frame of college of resource and environmental...
Key management is considered to be the prerequisite for secure communication in WSNs. However, many of those key management schemes normally either require the pre-deployment knowledge to generate keys, which is unrealistic, especially in large scale sensor networks, or consume a large amount of energy. In this paper, we present a new key management scheme named Energy-efficient Location-dependent...
Through a series of direct shear tests on the interfaces between soil-soil and soil-roots of Artemisia sphaerocephala and Sabina valgaris, friction properties of the interface were examined, and the influence of normal stress, dry density of soil, water content of soil on friction properties were analyzed. The results showed that the shear relationship of interface between soil-roots of Artemisia...
Three types of dehydrated palygorskites are prepared, and XD-172 silane coupling agents are used to modify dehydrated palygorskite by the drop height method employed to evaluate the effects of surface modification. The optimal modification process parameters are obtained by analyzing the influences of modification agents quality, modification temperature and modification time on drop height, so that...
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