Coseismic effects of water temperature based on digital observation from Tayuan well, Beijing   总被引：1，自引：0，他引：1  

杨竹转邓志辉  陶京玲谷圆珠王志敏  刘成龙 《地震学报(英文版)》2007,20(2):212-223

On the basis of digital records from Tayuan well,we study coseismic effects of water temperature caused by re-mote earthquakes.The records show that the water temperature changes are consistently following the process ofdrop-rise-recovery regardless of focal mechanism or epicentral directions.The step amplitude of water temperatureincreases with the increase of earthquake magnitude,and decreases with the decrease of epicentral distances.Theyhave rather well correlation.Water temperature rising after earthquake is influenced by water level variations.Fi-nally,the mechanisms of coseismic effects of water temperature have been discussed.Preliminary study shows thataccelerated convection and mixing of different temperature water in virtue of seismic wave are the main causes ofwater temperature drops.Seismic wave accelerates water convection,which causes warm water to move up fromdeeper part of the well and cold water to go down from the upper part.Temperature probe will detect water tem-perature drops at early stage.After the occurrence of earthquake,as the fluctuation of water level gradually quietsdown,water temperature near the probe begins to rise.  相似文献   

Regional differences and determinants of built-up area expansion in China   总被引：1，自引：0，他引：1  

Huang JiKun  Zhu LiFen  Deng XiangZheng 《中国科学D辑(英文版)》2007,50(12):1835-1843

Based on remote sensing data on land use provided by the Chinese Academy of Sciences and socio-economic data collected by the authors,this paper analyzes the trends and regional differences in built-up area(BUA) expansion in China from the late 1980s to 2000,and empirically estimates the major determinants of BUA expansion in different regions in 1996―2000.In 1989―2000,although China's overall BUA expansion accelerated,the trends differed significantly among regions.BUA expansion in the central and western regions accelerated significantly,but it slowed down considerably in the east-ern region.The estimation results from our econometric analysis reveal that BUA expansion in the eastern region reached a period when economic growth had no further significant impact on per capita BUA,the land utilization in this region has become more intensive with further expansion of the economy.In the central and western regions,the BUA has expanded remarkably due to the relatively more flexible land development policies and the relatively cheap land prices.Therefore,as the econ-omy continues to grow rapidly,policies relating to BUA expansion and cultivated land reductions may face more serious challenges in the central and western regions.  相似文献   

农业气象指标数据库及应用管理系统开发     

邓彪  郭海燕何潇 《四川气象》2007,27(3):32-34

选用Microsoft SQL Server2000作为数据库系统平台,以Powerbuilder8为开发工具,开发了面向客户机/服务器体系结构的农业气象指标数据库应用管理系统。本文阐述了该系统的设计思路、结构及主要功能。  相似文献   

Regional fractures and denudation of gold ore deposits in Gangdise block,Tibet: Evidence of Ag/Au values     

Li  Shengrong  Deng  Jun  Hou  Zengqian  Xiao  Run  Yuan  Wanming  Feng  Xiaoliang  Zhao  Zhidan  Shen  Junfeng  Zhou  Su 《中国科学:地球科学(英文版)》2001,44(1):121-127

Mapping with Ag/Au ratios of mineralized rocks and ores as a parameter reveals that the deep fractures in the Gangdise block control the distribution of the high value regions which may represent the shallow zones of strongly mineralized areas. The variance gradient regions with large Ag/Au ratio may represent the boundaries between strongly mineralized areas and weakly mineralized areas. In the middle part of the Gangdise block, gold and silver mineralization centers mainly distribute along the NW extending Coqen-Xigaze region, NE extending Yangbajain region and E-W extending Lhasa-Gongbogyamda region. The gold and silver mineralized rocks and ores may have been slightly denuded in the west of the middle Gangdise block, and the denudation in the east, however, may be stronger. The primary gold and silver prospect in the west may be better than in the east.

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ANALYSIS ON SPATIAL FEATURES OF LUCC BASED ON REMOTE SENSING AND GIS IN CHINA   总被引：2，自引：0，他引：2  

GAOZhi－qiang DENGXiang－zheng 《中国地理科学(英文版)》2002,12(2):107-113

In view of the large quantities of areas,complex landform and dynamic change of resources and environ-ment in China,China has already funded abundantly a series of macro remote sensing investigation projects in land use cover change(LUCC) since 1990.Supported by the achievements of such projects,Chinese resources,environmental and remote sensing database(CRERS) was created.In this paper,we standardized the LUCC dataset of CRERS at scale of 1km,which facilitated the study of spatial features of LUCC in China.The analysis on the spatial features of LUCC and their causes of formation in China are based on the CRERS supported by the technologies of Geographic Information System(GIS) .The whole research was based on the grade index of land use,ecological environmental index and index of population density.Based on the correlation analysis,we found that the special features of LUCC were closely related with those of ecological environment and population density,which resulted form that areas with better ecological environ-ment and high production potential of land were easy and convenient for human being to live,which,furthermore,led to the aggravation of excessive exploitation of land resources there.  相似文献   

A Correlation between Proton Events and Hα Flares and its Possible Interpretation     

Kim Jik Su  Yuan-Yong Deng  Kim Kum Sok  Kim Jin Song National Astronomical Observatories  Chinese Academy of Sciences  Beijing Pyongyang Astronomical Observatory  Academy of Sciences  DPR of Korea 《中国天文和天体物理学报》2001,(6)

1 INTRoDUCTIONIt is well known that solar proton flares are maiuly correlated with strong, bright H. flares,in particular, with two ribbon flares. Ellison et al. (l961) were the first to draw attelltion tothe faCt that all cosndc-ray flares had the typical two-ribbon shape. Then, Svestka and Simon(1976) drew uP the "Catalog of Solar Particle Evellts, 195ty1969", and using this Catalog,Dodson and Hedeman could safely identify the flare sources for 50 proton events. Out of the 50idellti…  相似文献   

The Thermodynamic and Dynamical Features of Double Front Structures During 21-31 July 1998 in China   总被引：3，自引：0，他引：3  

ZHOU Yushu  DENG Guo  LEI Ting  JU Jianhua 《大气科学进展》2005,22(6):924-935

1. IntroductionDuring June and July, from the mid-lower reachesof the Yangtze River basin in China to southern Japan,a precipitation zone with intensive torrential rain ap-pears and lasts for two to three weeks. This phe-nomenon is called the "mei-yu" in …  相似文献   

植被温度条件指数在土壤墒情遥感监测中的应用   总被引：2，自引：0，他引：2  

陈怀亮  邹春辉  邓伟  祝新建 《气象科技》2005,(Z1)

利用多年极轨气象卫星遥感资料,在计算出植被条件指数和温度条件指数的基础上,计算了遥感监测土壤墒情的植被温度条件指数(TV)。通过实测土壤湿度和TV的散点图,可以得到土壤墒情遥感模型的干旱等级指标,可用于干旱等级定性监测;通过建立土壤湿度和TV的回归方程,可进行土壤墒情定量监测。该方法兼有植被条件指数和温度条件指数的优点,且计算简单,对地面气象要素依赖性小,实时性好,在作物生长旺盛期,其定量反演0~30 cm土壤墒情精度平均可达80%以上,可以替代作物缺水指数法。  相似文献   

抚顺市煤矸石对生态环境的影响及综合利用   总被引：4，自引：0，他引：4  

王长明邓军  张进德 《中国煤田地质》2005,17(1):32-35

抚顺市煤田开采悠久，煤矸石的堆积量大，对生态环境的影响显著，并且占用大量土地，严重污染环境，以及出现边坡失稳现象。本文详细地分析了煤矸石对生态环境的影响，阐述了目前煤矸石资源化的综合利用情况，以及开发利用煤矸石具有环保和经济双重意义。  相似文献   

Temperature dependence of magnetic susceptibility in an argon environment: implications for pedogenesis of Chinese loess/palaeosols   总被引：15，自引：0，他引：15  

Qingsong Liu  Chenglong Deng  Yongjae Yu  José Torrent  Michael J. Jackson  Subir K. Banerjee  Rixiang Zhu 《Geophysical Journal International》2005,161(1):102-112

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