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高祥真 《地震地磁观测与研究》1990,11(4):33-35
本文根据乌鲁木齐地磁台1988、1989两年的环境磁场测量结果,就地磁院内的环境磁场分布情况进行了讨论分析。并对该台如何保持长期不受环境磁场污染提出了建议。 相似文献
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使用高灵敏度的Ｇ８５６,ＤＴＺ－２型核子旋进式磁力仪,对乌鲁木齐地磁台１９９个测点的磁场梯度进行了复测,经过严格的数据校正处理,重新作出了ΔＦ等磁力线图,并分析讨论了台站院内环境磁场的变化特征,测量结果表明;乌鲁木齐地磁台仍处于磁场正常区,工作环境符合《地磁台站观测规范》要求。 相似文献
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本文通过对海南省(岛)地磁图绘制及其有关资料的分析,讨论了琼中地磁台地面磁场梯度分布,台地附近磁性环境变化特征,区域的地理位置、地质构造、磁场背景与台站观测值的关系。从而提出了琼中地磁台址磁场区城代表性的问题。 相似文献
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为了提高空间磁场探测精度,磁测卫星一般将磁强计安装在长伸杆的顶端,同时通过整星磁洁净控制,来减小磁强计安装位置的磁场干扰量.针对低轨磁测卫星的特点,提出零磁场环境下卫星极弱干扰磁场的高精度测量方法,模拟在轨地磁场环境下卫星感应磁场的标定方法,以及磁力矩器剩磁不确定量的处理方法.通过以上方法对卫星本体产生的干扰磁场实施严格的标定和数据修正,可有效减小其影响,极大提升空间磁场探测精度.该方法已应用于电磁监测卫星,将整星的磁场干扰不确定量降低一个量级,达到优于0.3 nT的水平. 相似文献
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通过对广州地磁台环境干扰源的监测，计算与分析得到：（1）不同时期产生的二个干扰源对地磁台1号墩磁场总强度测值的迭加影响为－25nT，与多台资料对比结果一致。（2）地磁台1号和5 ，1号与干扰源场区外Ⅰ号比测墩测得的磁场总强度、水平强度及垂直强度之差随时间的变化不明显，故认为广州地磁台环境干扰源目前尚属稳定。 相似文献
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左开挺 《地震地磁观测与研究》1988,(2)
广州地磁台1956年建成至今三十多年,其环境发生了很大变化。木文通过对建台以来五次台站环境磁场梯度测定方法的总结和分析结果表明:建筑物对地磁台环境磁场分布的影响,主要与距离及建筑材料有关;也与建筑物之走向有一定关系;钢筋混凝土楼房(七层以下)建筑与地磁台最小距离不得少于160m。 相似文献
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台湾花莲地震前电磁辐射异常分析 总被引：4，自引：0，他引：4
陈建毅 《地震地磁观测与研究》2003,24(1):46-48
1 台站基本情况及仪器性能 杭州地震台建于1980年，位于杭州市植物园内，地处偏僻，地形开阔，环境幽静。台站距公路2.5 km，周围无高压线、变电所和工业干扰源，观测环境较好。根据浙江省地震局“十五”前兆台站数字改造要求，杭州地震台于2002年2月架设了地震电磁辐射仪（EMAOS-L）。 超低频数字地震电磁辐射仪（EMAOS-L），频率范围0.01～10 Hz。传感器由电极和磁探头两部分组成。它们分别接收地下电场和磁场信号，测量电场和磁场的扰动变化。埋地电极的材料是1铬18镍9钛优质不锈钢，有较好的防腐和导电性能。其埋设深度为6 m。埋… 相似文献
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航天器工作环境中的地磁场可以用于定向和姿态控制，为空间飞行提供了一个天然的坐标系，但地磁场与带电、带磁的航天器相互作用又在一定程度上影响着航天器的运动参数（如自旋、定向、轨道等），地磁场的变化，特别是磁暴和亚暴期间剧烈的磁场扰动会对航天器的正常运行和航天器仪器的有效工作造成重大影响，与磁场变化相伴随的磁层、电离层扰动，高能粒子流对航天器的工作、空间通讯、对宇航员的安全都可能有严重影响。磁扰期间，中性大气的密度、温度的变化也会影响航天器的轨道和姿态，本文从地磁场结构和变化综合评价航天器工作的地磁场环境，为航天器利用地磁场和防护地磁场变化带来的有害影响提供一些背景材料。 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