陶瓷偏角仪的两点改进

陶瓷偏角仪在全国推广以来,多数反映仪器调好有困难,照相纪录时动镜光点成相不清晰,且光源灯炮又易烧坏。这些问题的存在降低了资料的可靠性,给使用者增加了麻烦,更影响仪器的推广。我县陶瓷偏角仪(以下简称陶偏仪)78年改成照相纪录时,就针对仪器结构上的缺陷,一面改进光源灯,一面改进读数箱上的玻璃介质窄缝。通过采取这些措施,光源灯由采用6V、0.4A的灯泡改为6V、0.15,降低了灯泡功耗,同时     

倾斜仪时号·光源灯控器的改进

为解决地震台光记录倾斜仪灯光系统故障率高的问题 ,研制了一种时号·光源灯控器。采用了数字钟报时及定闹信号对直接延时时号灯进行控制的措施 ,使仪器的无故障运行期及蓄电池的使用寿命得以延长 ,明显提高了观测质量。     

时号·光源灯控器的精简设计

山西阳泉地震台倾斜观测一直采用光记录倾斜仪 ,在以往的工作中 ,灯光系统的故障率最高 ,其中尤以时号灯控制部分为甚。多年来随着工作的需要 ,不断改革和研究 ,笔者最新设计并制作了精巧简捷的时号·光源灯控器 ,于 1 998年 9月安装运行至今从未发生过任何故障。时号·光源灯控器主要由电源、光源灯、数字钟、时号灯控制、简易智能故障诊断指示等部分组成。整个电路全部采用分立元件 ,简单灵活。其电原理见图 1。1　电源及光源灯部分的工作原理电源部分采用 6V供电制 ,效率为普通 1 2 V供电制仪器的两倍 ,交流部分设计为简单的开关自控间…     

巴里坤地震台SQ-70DSi水平摆观测数据干扰分析

基于2018—2021年巴里坤地震台水平摆观测资料,选取典型受干扰曲线,分析其变化趋势,总结仪器运行中存在的各类干扰因素。研究发现,干扰主要包括自然干扰(降雨、气压、雷击)、人为干扰(进洞巡检、调零标定、仪器维修)、仪器自身故障(数采故障、光源灯故障)等。     

金属摆倾斜仪光源自动控制器

本控制器主要是为金属摆光源灯、时号灯提供交直流电源转换,光源灯、时号灯烧毁自动报警,以及用石英钟时号脉冲作为时号灯的开启信号,准时点燃,日差小于0.2秒。时号灯的点燃时间可控范围为10～60秒。本控制器自1979年安装于广西地震局灵山地震台地倾斜组,使用至今性能良好,动作可靠。为该组获得良好资料提供了可靠保证。近几年该组质量上乘,连续为国家地震局评为先进单位。     

DQG综合监控仪

自1966年邢台地震后,地震系统开始研制、使用光记录水平摆倾斜仪。水平摆虽具有角放大倍率高,能较好地记录地倾斜的特点,但由于仪器洞室潮湿、台站供电不正常(停电或电压不稳定等),光源灯和时号灯常烧坏熄灭,推动钟(滚筒)生锈或发条、固紧螺钉、     

基式地震仪辅助设备的改进

本文介绍了在原有基式地震仪辅助设备上稍加改进,获得了显著的效益。主要对GDJA型记录电源、报警器的光源灯接线;报警、增光系统进行了改进;增设推动钟停走报警。     

光控大震报警器和增光控制器

我国测震台站的大震报警系统通常可见记录是采用电压信号触发方式报警(如DD-1、DK-1),而光记录地震仪的报警系统是采用光信号触发报警和增光(如SK,763仪)。长期的实践证明这两种方式各有利弊。电压信号触发报警抗干扰能力和静态稳定性能都不够理想,灵敏度也难于控制,对不同频率的地震电压报警灵敏度也不一致。用于光记录地震仪的报警和增光控制系统是放置在暗室中,靠光源灯通过狭缝聚焦后反射到光电管顶端触发报警。所以,光源灯的强弱、聚焦效果和记录光点的扫描速度都会直接影响报警的灵敏度和增光效果。综合我台具体情况,我们对原有的报警增光系统进行了改进。在不影响原仪器性能的基础上,利用DK-1记录器的记录笔杆摆幅来控制大震的报警灵敏度和光记录仪的增光控制。有     

Mcseis──150型地震仪在浅层地震勘探中的应用

本文介绍了对日本产Ｍｃｓｅｉｓ—１５０型地震仪器的技术改进。实践证明，改进后的Ｍｃｓｅｉｓ—１５０型地震仪器系列可满足一般场地的浅层地震勘探与其它工程物探方法的观测需要，并获得了较好的探测效果。     

地磁记录灯检测报警及备用系统

本文主要介绍了地磁台上的地磁光源灯检测报警装置和备用灯自动启动电路,适合地磁台安装使用。     

A Monte Carlo study of rainfall forecasting with a stochastic model

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.     

Earthquake Engineering and Engineering Vibration Aims And Scope

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     

Foreword

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.     

WORLD ASSOCIATION FOR SEDIMENTATION AND EROSION RESEARCH(WASER)

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     

Enhancing remote sensing research on global change to improve our understanding on Earth system processes

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     

SCIENCE CHINA Earth Sciences SUBJECT INDEX TO VOLUME 57(2014)

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