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本文通过对雷电放电分析,研究解决微震仪有线传输的避雷问题,并介绍接收雷电信号控制传输线上电荷对地短路的“ＤＢＬ－１”避雷仪。 相似文献
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Dou Jie Yunus Ali P. Xu Yueren Zhu Zhongfan Chen Chi-Wen Sahana Mehebub Khosravi Khabat Yang Yong Pham Binh Thai 《Natural Hazards》2019,97(2):579-609
Natural Hazards - This study investigated the characteristics of rainfall-triggered landslides during the Typhoon Bilis in the Dongjiang Reservoir Watershed, China. The comparative shallow... 相似文献
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以锦屏Ⅰ级水电站为例,在实际地质调查基础上,分析整理实测地应力数据,以数值模拟为手段,对高地应力区复杂结构谷坡应力场特征进行了研究。结果表明:高地应力区具有复杂结构的河谷,遭受河谷快速下切改造后,其谷坡应力场存在"四区"分布特征,即应力降低区、应力过渡区、应力增高区及原始应力区;背景构造应力和河谷形态特征是导致谷底高地应力现象出现的2个重要因素;谷坡内的软弱带对应力场分布产生重大影响,尤其是倾坡外断层的存在,更易于谷坡应力卸荷,这是导致锦屏左岸深卸荷形成的重要原因,以及导致左岸卸荷基准面高程低于右岸的原因之一;河谷下切过程中,右岸顺倾岸坡发生应力调整的坡体范围比左岸的反倾岸坡大,因此其原始应力区在更深的深度内才出现。简单探讨了锦屏深裂缝的成因机制,认为河谷迅速下切导致的快速卸荷是锦屏深裂缝形成的原因之一。 相似文献
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JWP-2稳频电路全部采用集成电路,应用锁相环频率合成技术,频率可调,性能稳定,组装调试方便,可做为原WP-1稳频电路板的更新换代产品.适当改进功放电路部分,可用在台网的768记录器及其它中小型交流同步电机稳频稳速电路中. 相似文献
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为充分利用石质弃渣,填石路堤已经成为山区高等级公路较普遍的路堤形式,为确保填石路堤的稳定性,急需开展弃渣碎石材料性质的研究。为研究颗粒粗糙度对样本性质的影响,本文以雅泸路某隧道废弃碎石的室内大三轴试验数据为基础,开展离散元法模拟级配碎石材料大三轴试验的颗粒粗糙度效应研究。论文详细介绍了样本颗粒形态及粗糙度的模拟原理、级配碎石数值样本的生成过程。分析数值试验过程及结果表明:团粒形态样本可以更真实地模拟碎石材料的骨架-孔隙结构,样本加载前有着合理、均匀的接触力分布形式; 团粒间的镶嵌结构可以极大的提高样本强度,变形过程中体现出不规则颗粒间的咬合、滑动特征; 样本强度与颗粒粗糙度(即D4值)有着线性正比关系; 样本初始平均接触数是决定样本内摩擦角的决定性因素; 团粒形态样本平均接触数随轴向变形发展的变化规律再现了颗粒材料弹性变形的微观力学机制。 相似文献
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At the head of Tokyo Bay, coastal upwelling of oxygen-depleted bottom water, induced by northeasterly wind-driven circulation, sometimes leads to the deaths of many shellfish and other aquatic animals across large areas, resulting in substantial economic losses to coastal fisheries. One of the chemical actions associated with this dynamic process is the oxidation of hydrogen sulfide in the bottom water into a colloidal sulfur substance. When sunshine reflects off surface water containing these sulfur particles, the seawater appears milky blue. This phenomenon has been termed “Aoshio.” One of the most important issues to address concerning upwelling in relation to Aoshio is to accurately predict when it will occur as well as its area and scale. In the preliminary study described here, we propose criteria for the occurrence of wind-driven upwelling associated with Aoshio on the southeast shore of Tokyo Bay using two analytical solutions. These two solutions were derived based on some specific assumptions in the context of a two-layered fluid. Comparison with observation data suggested that the criteria were valid. The results of analyses of the sensitivity of the solutions to all of the parameters incorporated into them were also found to be in accord with our qualitative understanding of this phenomenon. 相似文献
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通过架设地震无线短波数据通信网的实践,阐述了实现地震数据通信的可行性、优越性、实施技术措施,并较详尽的介绍了设备间的接口、接口连接以及对不具备专用通信接口的电台实现数据传送的接口改进等。本文对即将建立数字通信网的部门有一定的指导作用。对已建立数字通信网的部门可做为借鉴和参考。 相似文献
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