共查询到10条相似文献,搜索用时 187 毫秒
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苏州电工仪器厂生产的614系列电子交流稳压器在电网电压波动或负荷变动时能自动进行调整,供出稳压精度较高的220V交流输出电压.因此,该产品获得相当广泛地使用.仅我们单位就拥有614系列各种交流稳压器50余台.在分析室许多进口的电子精密分析仪器如直读光谱仪、极谱仪和原子吸收仪等等均用该稳压器供电.但这种稳压器有一个较严重的缺点,其整机自动电压调整电路的参考元件2D2P钨丝二极管易于损坏.一旦2D2P管烧坏, 相似文献
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前苏联科学院实验矿物研究所于1969年由世界著名的地质和岩石学家D.S柯尔仁斯基院士领导创立。现任所长V.A.Zharikov院士。该所现有320位工作人员,其中80位是科研人员,其余大多数是技术专家。全所拥有十二个研究实验室,八个技术组,一个设计组和一个实验工厂。现将该研究所主要研究领域和发展方向概述如下: 相似文献
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I号矿脉是山城金矿区中主要的工业矿体之一.黄铁矿和石英是主要的载金矿物,其标型特征是在矿脉空间上有规律的分布.矿体上部的黄铁矿以聚形晶为主,主要是八面体和立方体聚形晶以及立方体、八面体和五角十二面体聚形晶.黄铁矿的电物理性质,vnp>|-17|,α>|-120|.石英相对吸光度D1、D2、D2/D3、D3/D1、D2+3/D1相对较大.矿体下部的黄铁矿晶体形态主要是立方体单晶和立方体与八面体聚形晶,vnp<|-17|,α<|-120|,D1、D2、D2/Da、Da/D1、D2+3/D1相对较小.依据矿物标型展布规律,结合矿脉金含量的分布、载金矿物黄铁矿的晶体形态和热电性,以及石英相对吸光度的空间展布特征,建立了矿物学找矿模型,对深部矿脉进行了预测. 相似文献
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A Simple Monte Carlo Method for Locating the Three-dimensional Critical Slip Surface of a Slope 总被引:2,自引:0,他引:2
XIE Mowen Institute of Environmental Systems Kyushu University Hakozaki -- Higashi Ku Fukuok Japan College of Resource Engineering the University of Science Technology Beijing Xueyuan Ro Haidian District Beijing China 《《地质学报》英文版》2004,78(6):1258-1266
Based on the assumption of the plain-strain problem, various optimization or random search methods have been developed for locating the critical slip surfaces in slope-stability analysis, but none of such methods is applicable to the 3D case. In this paper, a simple Monte Carlo random simulation method is proposed to identify the 3D critical slip surface. Assuming the initial slip to be the lower part of a slip ellipsoid, the 3D critical slip surface is located by means of a minimized 3D safety factor. A column-based 3D slope stability analysis model is used to calculate this factor. In this study, some practical cases of known minimum safety factors and critical slip surfaces in 2D analysis are extended to 3D slope problems to locate the critical slip surfaces. Compared with the 2D result, the resulting 3D critical slip surface has no apparent difference in terms of only cross section, but the associated 3D safety factor is definitely higher. 相似文献
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