共查询到20条相似文献，搜索用时 62 毫秒
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《高原地震》2016,(3)
基于对5口流体观测井使用的3种数字化水位仪的校测对比实验及与气温、气压、供电交流电压等因素的相关性分析,对数字化水位仪的零漂特征及影响因素进行了研究,结果表明:1水位仪的零漂变化呈非线性的特征,每种水位仪、甚至每台水位仪的零漂变动规律均不完全相同,相比较而言,SWY-1A型水位仪的零漂变动更平稳,变幅较小;2水位仪零漂与气温、气压和供电交流电压的相关系数较低,基本可以排除气温、气压和电源电压对水位仪零漂的影响;3水位仪零漂源于探头,主要受探头老化等因素的影响。探头安装时对探头线测量的精准度、探头线因重力作用的拉长、调整探头埋深时对探头线测量的精准度以及水位校测的人为误差等,往往会导致零漂计算结果上的偏差;4数字化水位观测应定期、规范化地进行水位校测并根据零漂变化对观测数据予以校正,以确保观测数据真实、可靠,能更好地发挥地震预测效能。 相似文献
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对五山地震台地下流体数字化观测系统的运行状况进行了总结和统计,分析了水位仪和地热仪在实际运行及管理中存在的问题,并对数字化改造后的观测资料内在质量及现存问题进行了讨论。 相似文献
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详细介绍了用于测量水流量水堰的种类、结构、测量原理和方法,根据数字化水位仪投入式压力传感器的特点,结合地震观测的实际情况,主要介绍了利用水位仪在三角水堰中测量水流量的方法、计算公式及测量范围,并通过应用实例对比分析了人工与仪器的测量结果,为开展此项工作的地震台站提供了设计制造水堰的具体参数和观测方法。 相似文献
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选取广西“十五”地震前兆网络项目地下水位数字化观测与模拟观测资料,利用固体潮形态、水震波、相关性、内在质量等方法进行了对比分析,结果表明：两种观测的动态变化基本一致;在仪器正常运行、无故障情况下,两者数据的相关性良好。综合分析认为数字化观测的信息量大,灵敏度高,跟踪速度等明显优于模拟观测。随着仪器稳定性能的提高,用数字化水位观测仪器取代模拟水位观测仪器是可行的。 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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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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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