CAWS600型自动站采集器供电系统故障分析与检修方法

针对采集器电源供电系统出现的各种故障进行分析,提出检测流程和解决措施。     

The man swimming against the stream knows the strength of it : Hydraulics and social relations in an Argentinean irrigation system

In this paper we discuss hydraulic behavior of irrigation infrastructure within a context of spatially distributed power relations in an Argentinean irrigation system. In the Río Dulce basin, the irrigation area known as the Proyecto Río Dulce (PRD, command area 350,000 hectares) is the main irrigated area. An interesting characteristic of the PRD is that the larger landowners are mainly situated in tail end areas. Despite this potentially disadvantageous position, downstream farmers do not encounter problems in terms of water availability. This should not be regarded as self-evident: the hydraulic properties of the canals induce a need for downstream farmers to take deliberate action to ensure proper water delivery to their farms. When upstream farmers do not irrigate, too much water can flow downstream; when they irrigate too much, or manipulate cross regulators, downstream water scarcity can be the result; when canals are not maintained, extensive plant growth will increase hydraulic resistance and decrease discharges. It is not a coincidence that the downstream farmers invest heavily in canal operation and maintenance. These investments appear to be appropriate, as larger farmers tend to irrigate much more on average, compared to the smaller farmers upstream. The Argentinean case brings up issues on the structuring effects of irrigation systems, which need stronger theoretical understanding.     

我国极区冬季电离层加热实验研究

通过对非相干散射雷达观测数据的处理分析,研究了2008年1月我国在挪威Troms进行的冬季电离层加热实验效应.研究结果表明,电离层临界频率大于泵波频率的O波加热事件扰动效应明显,电子温度存在60%~120%的增强,扰动范围从150 km一直延伸到400 km,电子密度扰动不显著,最大可以观察到12%的密度衰减.受加热影响,离子声波频率有1~2 kHz的增加,离子线谱峰谷比增加,有时伴随有高阶谐振线出现.离子线和等离子线功率存在过冲现象,等离子线的功率剖面存在单峰、双峰和三峰结构,等离子线的功率增强幅度随频率负指数衰减.     

地震噪声异常实时监测

本文采用福建省85个测震台站2012年全年噪声资料的垂直向记录作为研究对象,将噪声记录以每5min为单位进行分段,求出每小段的功率谱,应用概率分布函数方法绘出台站的PDF图,之后利用网格概率法确定出台站的高低噪声参照线。另外,根据85个台站的PDF图异常,将噪声异常分成四类：缺数异常、低噪处异常、高噪处异常、中噪处异常。依据四类异常的特征分别研究出四类异常的挑选方法,再将这四种挑选方法结合形成地震噪声实时监测系统。选取福建省85个测震台站2013年7月份的噪声记录进行验证,结果表明：85个台站应用地震噪声实时监测系统识别出来的异常正确率都达到90%以上,挑选效果很好,并可应用于台站噪声实时监测。     

2015年尼泊尔8.1级地震前后拉萨地电场观测数据变化分析

2015年4月25日尼泊尔8．1级强烈地震前后,拉萨地磁台(以下简称“拉萨台”)地电场观测数据出现了长时间、大幅度异常变化。在对拉萨台地电场观测条件、观测系统以及观测结果进行初步讨论的基础上,利用“能量合成累加”和“MSA功率谱分析”等数据处理方法,从“时间域”和“频率域”两个方面,对该异常变化的主要特征和演化过程进行了分析。结果显示,尼泊尔8.1级地震前后,拉萨台的地电场观测数据异常变化,经历了“趋势变化一扰动变化一发震期一恢复期”等发展阶段,以及“低频变化一高频变化一平稳变化高频变化”等演化过程。综合分析认为,拉萨台地电场观测异常变化特征和演化过程,与相关现象和机理研究结果基本吻合,能够完整反映强烈地震孕育、发生和发展全过程,是具有一定客观性、典型性和代表性的珍贵资料。     

新疆测震台站部分常发故障分析与讨论

对新疆测震台站各类仪器设备经常出现的部分故障进行总结,内容涵盖地震数据采集系统、台站电源系统、台站数据通信系统经常出现的各类故障,阐述了故障表象,对故障产生原因进行分析与总结,并提出相应解决方案。对多种类型地震专业设备、多类台站通信方式进行对比分析,阐述了在实际使用中各自的优缺点与适用性,以期在台站改造与建设中起到参考作用。     

句容抽水蓄能电站工程场地稳定性及地震动效应研究

本文结合国家重点工程——句容抽水蓄能电站工程的具体情况研究了地震地质条件、地震活动环境及断裂构造对建设抽水蓄能电站工程的影响,研究了场地的稳定性及地形地貌对场地地震动效应的影响。经二维波动有限元分析,主坝坝基处的地震动峰值加速度要比地震危险性分析给出的平坦基岩场地放大11.6％～14．5％,地形地貌对场地地震动效应的影响是存在的,但相对较小,对本工程的抗震设防影响不大。本文研究成果已在工程设计中采用,该成果对其它同类工程也有一定借鉴作用。     

Proximity and power within investment relationships: The case of the UK private equity industry

The role of power in economic activity has been researched across the social sciences but there has been little engagement with the spatialities of power relations. This paper thus draws on a recent reinvigorated interest in power within economic geography to develop an approach for understanding how the spatiality of power relations in economic practices are constituted through different forms of proximity. It argues that proximity needs to be conceptualised as multi-dimensional including physical, cultural, virtual and organizational proximity between firms and actors. It further contends that the development of different forms of proximity shape the agency of empowered actors in industry clusters and regional economies. This general proposition is explored by presenting research into a case study: the UK-based private equity industry. The research focuses on the nature, role and development of different forms of proximity between private equity firms and the investee firms that are the subject of investments.