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介绍了GPS的工作原理和用GPS测量方位角的原理与方法,使用GPS测量方位角方法测量了琼中台6个仪器墩的方位角,取得较好的结果,并对测量结果精度和误差来源进行了分析.测量结果证明GPS测量方位角方法不受观测时间限制,受天气影响较小,对人员要求不高,观测时间只需2~3天,具有较大的应用前景.地磁台在新建、改造观测室后都必须进行方位角的测定工作.经过若干年后,为了检验观测墩和方位标的稳定性和可靠性,需要定期或不定期地进行方位角的复测工作. 相似文献
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论述大连地磁台天文方位角的测量原理、方法及观测结果,在地磁观测室未封顶的条件下,能在观测墩直接观测北极星,避免比测墩转角换算等因素增加的观测误差,观测精度提高. 相似文献
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《地震地磁观测与研究》2015,(4)
采用差分GPS和高精度水平角观测技术,精确测定蒙城地震台2个室内观测墩至7个室外观测标志的方位角,获取14个方位角参数,观测精度符合地磁技术规范要求。 相似文献
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介绍了GPS测量方位角的原理与方法。使用GPS测量了琼中地震台4个观测墩的方位角,取得较好的结果,并对测量结果的精度和误差来源进行了分析。结果证明,GPS测量方位角方法不受观测时间限制,受天气影响较小,对人员要求不高,观测时间只需2~3天,具有较大的应用前景。 相似文献
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中国地磁监测网由地磁台站和流动地磁测点构成,实现对观测网内地磁场的相对记录和绝对观测。它的绝对观测采用世界上最先进的F、D、I测量仪器组合,其中地磁偏角D是地理北和地磁北的夹角。对地磁偏角D的绝对测量要求在地磁台站投入正常观测前必须完成观测墩和观测标志的地理方位角测量,流动地磁测点在每次地磁偏角D观测前后至少进行地理方位角测量各一次。据地磁监测网《观测规范》要求,地磁偏角D的观测精度必须≤6″,所以中国地磁监测网采用天文和差分GPS地理方位角两种测量方法,且两种方法观测精度相当,均≤6″。与天文测量相比,差分GPS观测不受天气等自然因素的限制,操作简单,观测快捷,数据处理计算机程序化。随着GPS技术的普及,中国地磁监测网差分GPS地理方位角测量方法已基本取代了天文方法。本文主要介绍差分GPS在中国地磁监测网地理方位角测量中的应用。 相似文献
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山西大同数字遥测地震台网记录的震相特征 总被引:1,自引:0,他引:1
从地球及地壳的分层结构出发,使用较成熟的理论,从地震波传播的基本原理入手,结合多年的震相观察分析工作实践,选取了山西大同数字遥测地震台网近年来的一些典型震相进行了分析,得出本台网记录到震中距小于100km的地方震震相有Pg,P11,Sg,S11震中距在100km~500km的近震震相有Pn,Pg,P11,Sn,Sg,S11对比分析了在本台网内及周边地区发生的爆破与天然地震在震相上的差异性,并对其特征作了较详细的描述。 相似文献
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叙述了在FreeBSD环境下构建基于PPTP的VPN网关的过程和技术,分析了基本概念、实现方式以及在江西省地震信息网的实际应用等。 相似文献
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At present the development together with an intensification of anaerobic processes calls for methods of observation and control. It is very important to know intermediate metabolites of anaerobic microorganisms and the activity of methanogenic ones. Presented analytical methods are GLC analyses of lower fatty acids, alcohols, aldehydes and ketones and components of biogas. The chromatography using steam as a mobile phase is also mentioned. The method of determining the fluorescent coenzyme F420 was tested and modified. This coenzyme is specific for methanogenic microorganisms and is closely linked with their activity. The determination of the total activity of the hydrogenase system of anaerobic microorganisms by means of the rate of the consumption and evolution of molecular hydrogen was also presented. The applicability and effectivenes of these methods were verified on natural samples. All the methods mentioned above give satisfactory results with available equipment, materials and techniques. 相似文献
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Mostafa Baniasadi Mohammad Reza Zare' Mehrjordi Hossein Mehrabi Boshrabadi Hamid Reza Mirzaei Khalilabad Abbas Rezaei Estakhrooye 《Ground water》2020,58(4):560-570
In recent decades, increased extraction of groundwater for human and agriculture consumption has led to a substantial drop in groundwater level in large areas of across the world. Declining groundwater levels is a serious problem in itself and has multiple economic, social, cultural, political, security-related, and environmental externalities. The negative economic-environmental externalities of overextraction of groundwater in the Orzouiyeh plain in the Kerman Province, Iran, were evaluated using methods such as replacement cost, production function, market prices, shadow price, and the value of the input marginal product. After evaluating externalities, the Positive Mathematical Programming method was used to evaluate different water policies to reduce the consumption of groundwater. The total economic losses due to the externalities were calculated to equal 2.8 U.S. million dollars. The damages caused by environmental externalities were calculated to equal 436.1 U.S. million dollars. The results related to the positive planning model show that the best policy among different options, such as deficit irrigation policy or combined policies, involves implementation of pressurized irrigation systems. 相似文献
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对兰州地震研究所的三段历史作回顾,分别为国家地震局、中国地震局兰州地震研究所的体制沿革变迁,中国科学院地球物理研究所;中国科学院兰州地球物理研究所观象台早期创建;兰州地震研究所硕士点早期阶段。 相似文献
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Studia Geophysica et Geodaetica - 相似文献