怀来地震台体应变异常与特征分析     

李海孝  宋晓冰 《地震地磁观测与研究》2005,(Z1)

介绍了怀来台体应变仪器概况,据原始观测资料异常图形,讨论了怀来体应变资料在震前出现的异常特征和映震效果。  相似文献   

2005年北极冰川首期GPS监测   总被引：5，自引：1，他引：5       下载免费PDF全文

艾松涛  鄂栋臣  闫明  任贾文 《极地研究》2006,17(1):1-8

2005年7月至8月,中国北极黄河站第二次科学考察期间,科考队员针对黄河站附近首次队踏勘选定的两条典型冰川(AustreLov啨nbreen和Pedersenbreen),开展了以监测冰川物质平衡和冰川运动为主要内容的研究课题。本文分析了利用差分GPS进行北极冰川运动监测的可行性和优越性;初步处理了首期GPS监测的数据,并进行了精度分析,得出了较为满意的结果;针对北极冰川特殊的地理环境,探讨了在北极冰川上进行GPS测量应该注意的问题。  相似文献   

Surface roughness length dynamic over several different surfaces and its effects on modeling fluxes     

《中国科学D辑(英文版)》2006,(Z2)

Roughness length and zero-plane displacement over three typical surfaces were calculated iteratively by least-square method, which are Yucheng Experimental Station for agriculture surfaces, Qianyanzhou Experimental Station for complex and undulant surfaces, and Changbai Mountains Experimental Station for forest surfaces. On the basis of roughness length dynamic, the effects of roughness length dynamic on fluxes were analyzed with SEBS model. The results indicate that, aerodynamic roughness length changes with vegetation conditions (such as vegetation height, LAI), wind speed, friction velocity and some other factors. In Yucheng and Changbai Mountains Experimental Station, aerodynamic roughness length over the fetch of flux tower changes with vegetation height and LAI obviously, that is, with the increase of LAI, roughness length increases to the peak value firstly, and then decreases. In Qianyanzhou Experimental Station, LAI changes slightly, so the relationship between roughness length and LAI is not obvious. The aerodynamic roughness length of Yucheng and Changbai Mountains Experimental Station changes slightly with wind direction, while aerodynamic roughness length of Qianyanzhou Experimental Station changes obviously with wind direction. The reason for that is the terrain in Yucheng and Changbai Mountains Experimental Station is relatively flat, while in Qianyanzhou Experimental Station the terrain is very undulant and heterogeneous. With the increase of wind speed, aerodynamic roughness length of Yucheng Experimental Station changes slightly, while it decreases obviously in Qianyanzhou Experimental Station and Changbai Mountains Experimental Station. Roughness length dynamic takes great effects on fluxes calculation, and the effects are analyzed by SEBS model. By comparing 1 day averaged roughness length in Yucheng Experimental Station and 5 day averaged roughness length of Qianyanzhou and Changbai Mountains Experimental Station with roughness length parameter chosen by the model, the effects of roughness length dynamic on flux calculation is analyzed. The maximum effect of roughness length dynamic on sensible heat flux is 2.726%, 33.802% and 18.105%, in Yucheng, Qianyanzhou, and Changbai Mountains experimental stations, respectively.  相似文献   

A new combined European permanent network station coordinates solution     

N. Panafidina  Z. Malkin  R. Weber 《Journal of Geodesy》2006,80(7):373-380

The EUREF [International Association of Geodesy (IAG) Reference Frame Sub-Commission for Europe] network of continuously operating GPS stations (EPN) was primarily established for reference frame maintenance, and also plays an important role for geodynamical research in Europe. The main objective of this paper is to obtain an independent homogeneous time series of the EPN station coordinates, which is also available in SINEX format. A new combined solution of the EPN station coordinates was computed. The combination was performed independently for every week, in three steps: (1) the stated constraints on the coordinates were removed from the individual solutions of the Analysis Centers; (2) the de-constrained solutions were aligned to ITRF2000; (3) the resulting solutions were combined using the Helmert blocking technique. All the data from GPS weeks 900 to 1302 (April 1997–December 2004) were used. We investigated in detail the behavior of the transformation parameters aligning the new combined solution to ITRF2000. In general, the time series of the transformation parameters show a good stability in time although small systematic effects can be seen, most likely caused by station instabilities. A comparison of the new combined solution to the official EUREF weekly combined solution is also presented.  相似文献   

南极长城站科考队员度夏期心功能的变化   总被引：2，自引：0，他引：2       下载免费PDF全文

邓希贤  薛全福  于永中  杨勇  刘文利  周晓梅 《极地研究》1998,10(3):72-77

中国第六次南极考察队长城站男性队员２８人分为两个年龄组：１组ｎ＝１７,３０．８±１．１岁;２组ｎ＝１１,４８．０±１．７岁。借助美国Ｂｏｍｅｄ公司ＮＣＣＯＭ－３型无创心功能监护仪对他们心功能的动态变化进行了检测,结果表明：所有受试者夏季在长城站短期停留和工作心功能均无明显变化,但低年龄组心脏的适应能力优于高年龄组。  相似文献   

南极中山站极夜、极昼期间S_q~p、S_D的变化规律及特征     

杨友华  刘春节  汪阳 《地震地磁观测与研究》1996,(2)

本文利用１９９１年度南极中山站的地磁资料，分析研究极夜（５、６、７月）及极昼（１１、１２月）期间Ｓ、ＳＤ的变化特征。研究结果表明，Ｈ、Ｄ、Ｚ三个分量的Ｓ、ＳＤ在极夜期间的变化幅度都小于极昼期间的变化幅度，Ｓ在世界时ＵＴ６时左右出现极值。这是由于在５、６、７月的太阳直射点在北半球，太阳紫外辐射和Ｘ射线辐射减少，在１１、１２月太阳的直射点在南半球，太阳紫外线和Ｘ射线辐射增大，致使空间电高层等效电流发生变化所产生。  相似文献   

On　the　problems　concerned　in“The　subter－ranean　electrical　conductivity　structure　at　the　ChineseGreatWalStationonAntarctic（CG┐WSA）”byXiaopingZeng，YunfangLinandYuechenZhao     

陈伯舫 《地震学报(英文版)》1996,(3)

Ｏｎｔｈｅｐｒｏｂｌｅｍｓｃｏｎｃｅｒｎｅｄｉｎ“Ｔｈｅｓｕｂｔｅｒ┐ｒａｎｅａｎｅｌｅｃｔｒｉｃａｌｃｏｎｄｕｃｔｉｖｉｔｙｓｔｒｕｃｔｕｒｅａｔｔｈｅＣｈｉｎｅｓｅＧｒｅａｔＷａｌＳｔａｔｉｏｎｏｎＡｎｔａｒｃｔｉｃ（ＣＧ┐ＷＳＡ）”ｂｙＸｉａｏ...  相似文献   

自由设站的高效测设技术研究     

杜晓梅  杨武 《四川测绘》1997,20(2):79-82,58

本文在开发研究全站型电子速测仪的专用功能的基础上，结合工程测施工放样的若干应用，提出了一系列自由设站的高效，实用的测设方法。  相似文献   

Atmospheric trace gas measurements at Palmer Station,Antarctica: 1982–83     

E. Robinson  W. L. Bamesberger  F. A. Menzia  A. S. Waylett  S. F. Waylett 《Journal of Atmospheric Chemistry》1984,2(1):65-81

In early 1982 a station capable of sampling atmospheric trace gas constituents on a continuous basis was established at Palmer Station, Anvers Island, adjacent to the Antarctic Peninsula (64° 46S 64° 04W). Sampling operations began about 1 February 1982. This is an initial report on this station, its location, equipment and general research objectives along with some initial sampling results. The constituents being measured and recorded were: ozone, methane, carbon dioxide, carbon monoxide, CCl₃F (fluorocarbon-11), CCl₂F₂ (fluorocarbon-12), carbontetrachloride, methylchloroform, nitrous oxide, and Aitken nuclei (CN). Data storage, data processing, and sampling system control is handled by a Hewlett-Packard 85 system. Preliminary analyses of about the first 20–22 months of data are presented and show not only the expected long-term trends but also shorter period concentration cycles that seem to be related to synoptic meteorology.  相似文献   

高速遥感多星通用格式化同步器的设计与实现     

陈星燎  陈金树  葛成辉 《遥感学报》2003,7(5):386-392

格式化同步器是卫星地面站的关键设备之一。本文利用快速发展的FPGA技术设计出了高速遥感多星通用格式化同步器，同时分析了若干关键技术参数及系统性能。该同步器可接收绝大部分国内外卫星，并且单机独立，集成度高，体积小，抗干扰能力强，与系统互联方便。  相似文献