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《Rocks & Minerals》2013,88(1):51-55
The History of Mineral Collecting, with Notes on 1200 Early Mineral Collectors by Wendell E. Wilson, vol. 6, no. 6 issue of the Mineralogical Record. Published by the Mineralogical Record, P.O. Box 35565, Tucson, AZ 85740, 264 pages; 1994; $49 hardbound. $24 softbound (plus $1 postage and handling). Reviewed by Si and Ann Frazier Software: MINLOG: The Gem and Mineral Collector's Information Manager by Beaver Software Development, Inc., P.O. Box 1608, Marietta, GA 30061–1608; $225 (demo disk $5). Reviewed by Dr. Robert Cook 相似文献
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突出预测钻屑量指标的探讨 总被引:4,自引:0,他引:4
在综述目前钻屑量理论的基础上,利用有效应力原理,对钻孔周围煤体进行弹塑性力学分析,得出突出危险煤体钻屑量与钻孔直径、地应力、煤体强度以及瓦斯压力之间的关系,对突出预测预报有一定的指导意义。 相似文献
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