共查询到20条相似文献，搜索用时 187 毫秒
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分量质子旋进磁力仪定向方法的研究 总被引：1，自引：0，他引：1
朱兆才 《地震地磁观测与研究》2000,21(5):16-20
根据分量质子旋进磁力仪补偿线圈电流允许误差 ,补偿线圈轴定向应满足的关系式和给出的允许误差 ,研究并给出了实现分量质子旋进磁力仪各定向标准的实用方法。 相似文献
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用质子旋进式磁力仪作地磁场垂直分量Z的绝对测量(在纬度较高的地方),需做好补偿线圈定向、确定补偿电流和调水平三项工作。任何一项做得不好,均直接影响测量的精度和可靠性。 我们使用CHD-6型质子旋进式磁力仪,73-1 型分量仪在北京平谷县马坊地磁台进行了补偿线圈不水平试验。 本文就线圈不水平(以下称水泡偏移)对Z测量结果的影响进行分析,了解其影响的定量关系,以便根据测量精度确定对水准器水泡的 相似文献
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北京台为改善质子分量磁力仪观测质量，用国产ＤＴＺ－３型质子磁力仪和ＱＨＸＣ－７５型仪的分量线圈装置组合成质子分量磁力仪，本文介绍了其性能的检测和观测使用状况。 相似文献
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为了分析国产质子旋进磁力仪的整体性能，根据实际测试环境条件和《质子旋进磁力仪野外测试大纲》，使用128套EREV-C型质子旋进磁力仪采集野外数据。通过对比分析地磁总场数据、标准偏差、相关系数等，对EREV-C型质子旋进磁力仪的一致性、稳定性等性能进行评价。分析表明，EREV-C型质子旋进磁力仪性能良好，可满足相关测试要求，符合野外磁法测量和地磁相对观测的使用需求。 相似文献
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新型质子旋进磁力仪软件系统设计与实现 总被引：1，自引：1，他引：0
针对自主研制的新型质子旋进磁力仪的硬件系统的技术特点,结合具体测量中的一些实际情况,基于Microchip公司的P1C16F877A芯片,设计并实现了一套测控软件;系统的介绍了该软件系统各个模块的设计原理与程序流程,分析了其技术特点与优势.并在测量大地总场值的实验中,与加拿大GEM公司生产的DiDd三分量磁力仪测量进行了比较,结果表明我们的新型质子旋进磁力仪在测量精度与准确度上接近DiDd三分量磁力仪,而在成本仪器体积与重量方面,则明显优于DiDd. 相似文献
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M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
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《地震工程与工程振动(英文版)》2014,(4)
正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and 相似文献
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George W. Housner 《地震工程与工程振动(英文版)》2008,7(2):I0001-I0001
Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States. 相似文献
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《国际泥沙研究》2014,(4)
正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study 相似文献
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JianCheng Shi 《中国科学:地球科学(英文版)》2014,57(10):2281-2282
正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases 相似文献