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刘连生邱金铭焦永斌陆哲祥 《工程爆破》2013,(6):46-49
在工程爆破实践中,盲炮产生后未爆炸的炸药在地下要占据一定的空间,硐室爆破盲炮检测可归结为探测在地下一定范围内硐室爆破盲炮点物理性质异常的问题。高精度磁法即在硐室内预置磁性体建立物理场源,炸药爆炸后磁性体被破坏,物理场源消失。理论上,通过对比硐室爆破前后地面磁场的变化,可实现硐室爆破盲炮的检测。现场试验研究表明,在现有技术与经济条件下,高精度磁法用于硐室爆破盲炮检测依旧是个难题。 相似文献
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《中国标准化(英文版)》2009,(2):4-4
Joe Bhatia Visits SACJoe Bhatia,the CEO of American National StandardsInstitute (ANSI),was greeted by Ji Zhengkun,administratorof SAC,on 10th Feb in Beijing.The meeting at SAC head-quarters included discussions of standardization and op-portunities for international cooperation between SAC andANSI. 相似文献
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Anil Mital Paul T. Kemmerling Robert D. Dryden Tom B. Leamon Donald L. Morelli Bahador Ghahramani 《IIE Transactions》1993,25(3):99-104
There is a growing concern in die labor sector to reduce stresses in the work place and the associated strains and adverse effects on health which result from newer forms of tasks that workers are increasingly called upon to perform. One approach to reducing stresses is to reduce the work-week (fewer hours per week). Social expectation of longer vacations and leisure time, demographic changes, and changes in the nature of die work and attitudes towards work also support this trend. The objective of this position paper is to consider the implication of such a move and the feasibility of this approach. Specifically, we consider the effects of a shorter work-week on productivity and economy and discuss the various patterns of shorter work-week. Finally, we present our position on die pattern of the shorter work-week in the United States in the future. 相似文献
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综述了近年来高分子材料在生物传感器的应用研究进展,介绍了高分子复合物,水凝胶,溶胶-凝胶,改性聚合物,电生聚合物,氧化还原聚合物,离子交换聚合物和具有特殊结构的聚合物在酶和电子媒介体固定化方面的应用以及由其制备的生物传感器的性能,对应用于生物传感器的高分子材料的分类,制备方法和原理及其特性进行了深入的探讨,并指出了目前其存在的主要问题及解决方法,对高分子材料在生物传感器中的应用前景予以展望。 相似文献
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Roberta Valtorta 《Photographies》2019,12(2):155-175
In the 1980s and the beginning of the 1990s many Italian photographers worked so intensely on the transformation of contemporary landscape, often participating in group projects and in public commissioned projects. The phenomenon was so large and important that we can talk about an “Italian landscape photography school”, although these photographers were different from one another. They were looking for a different idea of landscape, far from the stereotypes of the “Beautiful Country”, as Italy is called, and far from tourist and folklore clichés. Their artistic and civil engagement contributed to change and update Italian photography and to “institutionalize” it, bringing it into public archives and museum collections. 相似文献
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Conventional images of the French political economy portray a country stuck in a regressive dynamic, which hinders the construction of competitive industries. Recent developments question this interpretation of the French production regime: labour productivity and corporate profitability are high, the country has known an export boom, and has become the largest recipient of foreign direct investment on the continent. This paper attempts to analyse and explain these successes in French economic performance. It argues that the reorganization of the French economy owes much to a shift in the operation of the state-centred corporate governance system. While the state withdrew from direct involvement in the economy, it utilized its influence directly to pressure large firms to restructure internally, giving them the space to do so. The paper examines shifts in patterns of work organization, skills formation and firm-supplier networks as sources of increased competitiveness, along with shifts towards regional production networks within metropolitan France that have given new forms to the national innovation system. 相似文献
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水凝胶研究的最新进展 总被引:11,自引:0,他引:11
10余年来,有关刺激响应性水凝胶的理论和应用研究取得了长足的进展,在生物医学领域,水凝胶作为药物释放载体,软骨支架,细胞外基质更显示出巨大的应用前景。文中简要介绍了凝胶中水的特异性的研究进展,并综述了多糖和多肽凝胶的创建方法和其在组织工程中的应用。 相似文献