广东天气雷达组网策略及在台风监测中的应用   总被引：2，自引：1，他引：1  

白玉洁  胡东明  程元慧  胡胜 《热带气象学报》2012,28(4):603-608

天气雷达是台风监测的重要探测工具,雷达资料实际应用过程中经常遇到多雷达运行不同步、资料采集不及时等问题的困扰。采用区域雷达服务器中央控制运行模式能有效解决这些问题。以0606号台风"派比安"为例,介绍了广东省新一代多普勒天气雷达网在台风监测方面的策略和运行模式。多雷达拼图大大拓展了雷达的监测范围,双多普勒雷达风场反演技术能够揭示台风环流的中尺度三维结构。  相似文献   

冲击反循环技术装备在大口径嵌岩钻进中的应用   总被引：1，自引：0，他引：1       下载免费PDF全文

卜长根  刘国平 《地质与勘探》2001,37(4):76-78

比较嵌岩钻进几种方法的特点，重点介绍了以双绳同步卷扬为核心部件的重锤式冲击反循环钻进技术的应用，拓展传统冲击钻和转盘钻机对地层的适应性，通过不同类型的钻具和工艺组合，以满足不同地层或不同类型槽孔对钻机的要求。  相似文献   

Relativistic electron flux enhancement at synchronous orbit during SEP event on July 14, 2000     

赵华  朱光武  王世金  高玉芬  刘振兴 《中国科学D辑(英文版)》2002,45(5):399-408

Relativistic (E >1.6 MeV) electron flux enhancements during Solar Energetic Particle (SEP) events as observed by the synchronous FY-2 satellite at orbit located at 105°E are investigated. Energetic protons during SEP events heavily contaminate relativistic electron flux measurements. The ratio of the contamination in the original measurement of relativistic electron flux was over 30% during most of the SEP event on July 14, 2000. A method has been developed to eliminate the contamination caused by the energetic protons, and a "corrected" relativistic electron flux has been obtained. The "cleaned-up" relativistic electron flux measurement shows that relativistic electron flux enhancement at synchronous orbit is well correlated with SEP events during which the IMF Bz has some southward periods. The enhancement could arise as the transport of relativistic electrons from the upstream solar wind into synchronous orbit via the magnetotail.  相似文献   

Influence of earthquake spatial variability on differential soil displacements and SDF system response     

Camillo Nuti  Ivo Vanzi 《地震工程与结构动力学》2005,34(11):1353-1374

The aim of this study is to develop design criteria, which account for the effects of earthquakes spatial variability. The two simplest forms of this problem are dealt with: differential ground displacements and differential structural displacements, for points and structures separated in space. The structures considered are linear elastic single degree of freedom oscillators. These problems may seem trivial, but some of the codes considered appear improvable on this aspect. First, the mathematical model is set up using basic random vibration theory and the code provisions critically examined. Then, the sensitivity of the ground and structural differential response is assessed. The differential displacements can be mathematically expressed in a straightforward fashion, both for the ground and the structures. These expressions are simple enough to be used as design rules. Comparison with the European and Italian Civil Protection codes shows that these can be improved on this aspect; and, for this reason, the Italian draft code for bridges has been mainly drafted following the results of this study. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

油气化探中芳烃油气性的辨识   总被引：2，自引：2，他引：2  

宋继梅  李武  胡斌 《物探与化探》2006,30(1):45-47,54

在分析全国各大油田典型油气的基础上,提出各种油气的三维荧光光谱和固定波长同步荧光光谱特征峰和共性峰。钻井过程常常加入磺化沥青或原油,通过对磺化沥青的三维荧光光谱和固定波长同步荧光光谱特征峰的分析,可以进行干扰因素的识别;原油的加入将抬高整口井钻井岩屑的荧光强度,可以视其为背景而消除。湖相和海相沉积物等含有丰富的多环芳烃,采用恒定能量同步荧光光谱分析效果更佳。此外,处理数据时还要考虑具体的地质情况。  相似文献   

一种新的航空伽马能谱测量数据改正方法   总被引：2，自引：1，他引：2  

张文斌  于长春  周锡华 《物探与化探》2007,31(2):143-148

在地形起伏较大的山区进行航空伽马能谱测量时,使用传统的方法做高度改正,往往造成不小的误差,为此笔者提出一种飞行高度与地形的同步改正的方法.该方法快捷简便,简单易行,较好地解决了上述难题.  相似文献   

吉安市区GPS地籍控制网的建立     

詹家民 《全球定位系统》2007,32(5):33-38

随着GPS导航定位技术的日臻完善，GPS定位技术在工程测量领域的应用越来越广泛，从地形测图、线路放样、到控制测量都发挥了重要的作用。本文主要叙述了应用GPS定位技术建立吉安市区地籍控制网的情况。  相似文献   

分布式地质图空间数据库数据交换系统的设计与实现     

杨林  周顺平  万波 《测绘科学》2007,32(3):151-152,116

分布式地质图空间数据库具有数据分布、数据源异构、地质实体间有着复杂语义关系的特点,而多源分布的地质图数据在实际应用中又需要统一管理,协调工作,这就提出了数据交换的要求。传统的数据库复制方案无法满足地质实体级的数据交换,本文提出了一种以地质空间要素类为交换单位的增量同步的数据交换设计方案,详细阐述了其关键的数据交换原理,数据传输方案以及上下级服务器之间的数据同步策略,该方案现已用于国家地质图空间数据库管理系统,被认为是一种行之有效的方案。  相似文献   

Graph-based synchronous collaborative mapping     

Xiaochen Kang 《国际地球制图》2015,30(1):28-47

Collaborative mapping is different from other collaborative editing systems because of spatial characterization and spatial dependence. Spatial operations on a mapping feature influence that feature and also the neighbouring features. Therefore, conflicts are likely to occur if common features or interrelated features are processed concurrently. For collaborative editing systems, the widely used multiversioning technique enables improved concurrency, which, however, is at the cost of synchronous data consistency. To maintain the synchronous consistency in collaborative mapping, a practical framework called the spatial operation dependence graph is proposed. The features are expressed as graph vertexes, while the dependences among the operations on features are expressed as graph edges. Through maintaining locking statuses of the vertexes, interdependent operations on features are arbitrated according to the temporal order, while independent operations can concurrently proceed. The utility of this framework is demonstrated through a prototype system, Co-Mapping.  相似文献   

北京良乡井水温动态初析     

赵文忠  乔振瑛  谷庭瑶  牟凤香 《地震地磁观测与研究》2006,27(4):113-117

简要介绍了北京市良乡井水温动态的观测条件与环境,系统分析了水温年月日动态特征,认识了水温的正常动态变化规律与干扰因素,研究了典型震例,发现了同震异常与远兆异常等现象。  相似文献