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应用人造多晶冰开展了正弦振动荷载和恒荷载压缩蠕变实验。振动应力的最大值为0.50MPa,最小值为0.34MPa,对时间的平均值为0.42MPa,实验频率在10^-2-5Hz范围内变动。恒荷载实验的初始应力为0.42MPa,实验温度一律为-1℃。当应变很小时(低于~0.14%)样品在一个振动周期内发生的可恢复应变随应变的增加而增加。一个振动周期内可恢复应变的量级为10^-4。振动荷载下样品最小平均应 相似文献
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本简要介绍我国学1987年以来在国内外冰流动理论和试验研究中取得的进展,包括晶粒长大规律、异向性冰的第三蠕变、压剪联合作用下冰的流动以及全新世冰和冰期冰流动性质的差别等,并加以评论。 相似文献
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中国冰川温度研究40年回顾与建议 总被引:2,自引:1,他引:1
Many temperature measurements have been made on 29 glaciers in China since 1959. The regional thermal features of glaciers are now revealed. It is distinguished that there are three categories of temperature distribution in China, i.e., cold, temperate and polythermal. Temperate glaciers are located in the southeastern Tibetan Plateau. The heat conduction in the surface layer and the heat transfer within a glacier can be quantitatively described. Two-dimensional temperature distributions are gained for the Glacier No.1 at the headwaters of the Urumqi River in the Tianshan Mountains and for the Chongce Ice Cap in the West Kunlun Mountains. Geothermal flux is derived from measurements down to or closed to the bottom. The Tibetan Plateau is an area with high geothermal flux. The author suggests to measure more ice temperature by using the boreholes for extracting ice core, however, there is no need to repeatedly measure the temperature within the near-surface layer. 相似文献
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正我和中国科学院兰州冰川冻土研究所雷玉钧处长私交不多,大多是公务.我是1961年分配到中国科学院地理研究所冰川冻土室(冰川所前身);他比我晚一年进入冰川冻土室,负责业务处.不久就流传许多雷处长抠门的传闻.那是计划经济年代,研究、办公需用一切物品,哪怕是一个信封,都得填领料单,经他批准,然后到库房去领.未经允许,不得自行采购.他崇尚节约,先给批一半,说省着用,实在不够再领. 相似文献
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