在"98.7"武汉强暴雨过程中不同尺度波动的作用及其相干性   总被引：8，自引：7，他引：1  

魏凤英  朱福康  谢宇 《高原气象》2005,24(1):49-55

以Morlet复数小波函数分析方法等为基础,研究了1998年7月下旬长江中下游强暴雨过程中不同尺度波动的作用,同时用交叉谱研究了不同尺度波动的相干性。结果表明,这次强暴雨过程是一次中-β尺度能量积累与释放的过程,在2h左右的较短时周期波动中,中-α尺度对中-β尺度产生一定的干涉效应。  相似文献   

Dehydration melting of solid amphibolite at 2.0 GPa: Effects of time and temperature   总被引：3，自引：0，他引：3  

ZHOU Wenge  XIE Hongsen  LIU Yonggang  ZHENG Xiaogang  ZHAO Zhidan & ZHOU Hui . Laboratory of Material in the Earth’s Interior  Institute of Geochemistry  Chinese Academy of Sciences  Guiyang  China  . Department of Geology  China University of Geosciences  Beijing  China  . Department of Geology  Peking University  Beijing  China 《中国科学D辑(英文版)》2005,48(8):1120-1133

The dehydration melting of the natural rock at high pressure is important to investigating the magma formation in the earth’s interior. Since the 1970s, a lot of geological scientists have paid more atten- tion to the dehydration melting of the natural rock[1―5]. Previous experiments of dehydration melting and observations of fieldwork argued that the dehy- dration melting of the rock was probably the most important fashion for the melting of the lower crust rock[6―12]. The genesis of most …  相似文献   

Adjoint method for the optimum planning of industrial pollutant sources     

LIU Feng    HU Fei & ZHU Jiang . College of Environmental Sciences  Peking University  Beijing  China  . LAPC  Institute of Atmospheric Physics  Chinese Academy of Sciences  Beijing  China 《中国科学D辑(英文版)》2005,48(8):1270-1279

The deterioration of air quality is threatening the life and health of people. Scientists in China and other countries have done a great deal of research work on the details of air pollution and the methods of preven-tion and control during the past decades. Up to now, most of the achievements are concentrated on the techniques of controlling pollutant sources and the programs of reduction, which focus on the improve-ment of air quality and the restoration of environment. The techniques of con…  相似文献   

<Superscript>40</Superscript>Ar/<Superscript>39</Superscript>Ar chronology and geochemistry of high-K volcanic rocks in the Mangkang basin,Tibet     

Huihua?Zhang  Huaiyu?He  Jianghai?WangEmail author  Guanghong?Xie 《中国科学D辑(英文版)》2005,48(1):1-12

Our two newly obtained high-quality ⁴⁰Ar/³⁹Ar ages suggest that the high-K volcanic rocks of the Lawuxiang Formation in the Mangkang basin, Tibet were formed at 33.5 ± 0.2 Ma. The tracing of elemental and Pb-Sr-Nd isotopic geochemistry indicates that they were derived from an EM2 enriched mantle in continental subduction caused by transpression. Their evidently negative anomalies in HFSEs such as Nb and Ta make clear that there is an input of continental material into the mantle source. The high-K rocks at 33.5 ± 0.2 Ma in the Mangkang basin may temporally, spatially and compositionally compare with the early one of two-pulse high-K rocks in eastern Tibet distinguished by Wang J. H. et al., implying that they were formed in the same tectonic setting.  相似文献   

星系团内物理过程对宇宙微波背景辐射的影响     

吴建新  谢光中 《中国天文和天体物理学报》1992,(3)

观测表明,富星系团内存在着大量的高温热电子.它们将与微波背景光子相互作用.本文考虑了星系团集合使微波背景辐射产生的畸变.我们的理论估计表明,富星系团集合的高温热电子散射背景光子,使背景辐射谱偏离黑体辐射谱.在背景谱的维恩区,畸变小于2.74K黑体峰值强度的1％,这个结果与最近COBE卫星的探测结果是一致的.没有得到Matsumoto所探测到的在700μm附近有相当于黑体谱峰值强度10％的重大畸变.星系作为微引力透镜,对背景辐射的影响不可能探测得到.星系团内热电子的轫致辐射在微波波段更弱.  相似文献   

建平地区三座庙序列侵入岩侵位机制讨论     

费平  赵凤顺 《国土资源》1992,(4)

通过野外对三座庙序列侵入岩的岩体平面与剖面形态、岩体的内部构造、岩石与围岩的构造型式、接触带的度形特征等宏观地质特征的研究,推测岩体侵入位机制为强力挤入方式定位,即气球膨张式。笔者运用岩石的有限应变测量原理和方法,结合岩组分析及流变学、现代变形理论,对三座庙序列的侵入岩岩石做了有限应变测量和岩组分析工作,所得定量资料为确定岩体的浸位机制提供了理论依据。三种岩石有限应变测量,即:算术平均法、长短轴法、Rf/φ曲线法的富林指数k值均在0相似文献   

Spatiotemporal variations of internal P-loading and the related mechanisms in the large shallow Lake Chaohu     

Zhang Min  Xie Ping  Xu Jun  Liu Bingqin  Yang Hong 《中国科学D辑(英文版)》2006,49(1):72-81

Spatiotemporal variations of P species and adsorption behavior in water column, interstitial water, and sediments were investigated in the large shallow eutrophic Lake Chaohu. Orthophosphate (Ortho-P) and total phosphorus (TP) concentrations were significantly higher in the western part than in the eastern part of the lake, due to different nutrient inputs from the surrounding rivers. Moreover, particulate phosphorus (PP) concentration was in a similar spatial pattern to Ortho-P and TP concentrations, and also showed significantly positive correlation with the biomass of Microcystis, indicating more uptake and store of phosphorus by Microcystis than by other algae. Increase of pH and intensive utilization of P by phytoplankton were the main factors promoting P (especially Fe-P) release from the sediment to interstitial water during the cyanobacterial blooms in Lake Chaohu. Spatial dynamics in TP concentration, P species and adsorption behavior of the sediment, coupled with the statistical analyses, suggested that the spatial heterogeneity of P contents in the sediment was influenced by various factors, e.g. human activities, soil geochemistry and mineral composition. In spite of similar TP contents in the sediments, increase in proportion of Fe-P concentration in the sediment may result in a high risk of P release.  相似文献   

干旱区典型地物光谱数据库系统设计   总被引：1，自引：0，他引：1  

姬洪亮  塔西甫拉提·特依拜  张飞  夏军 《测绘科学》2012,37(5):212-215

本文在干旱区典型地物光谱和图像数据积累的基础上,以地物光谱数据,利用MS SQL Server数据库和SuperMap IS.NET平台,采用服务器/浏览器多层次架构体系进行集成,开发出基于Web的具有光谱信息管理、检索查询、可视化分析、光谱特征分析等功能的干旱区典型地物光谱数据库系统,并且能够实现无缝共享,易于维护,便于二次开发。  相似文献   

国土资源部门户网站土地市场信息整合集成实践和研究     

谢敏  贾光宇  陈卉  于洪奇  黎韶光 《国土资源信息化》2012,(1):49-53

土地市场动态监测与监管关乎国计民生,土地市场信息发布是国土资源部门户网站服务社会公众的重要功能。本文从土地市场信息整合需求分析入手,详细介绍了国土资源部门户网站内容整合规划、信息分类整合和页面集成策略,并以实际成效证明了土地市场信息整合是国土资源部门户网站推动国土资源信息社会化服务的一次成功实践。  相似文献   

鄱阳湖湿地地理信息系统建设及其关键技术研究     

陈建群  吴勰  王振兴  朱建军 《武汉大学学报(信息科学版)》2012,37(8):888-891,896,1012

以鄱阳湖湿地为研究对象,建立了集知识、模型和决策为一体的鄱阳湖湿地基础地理信息系统,在一定程度上解决了湿地生态经济建设中环境污染及水文监测、洪涝灾害预测、湿地土地规划时空演变模拟以及水利枢纽建设等不同行业相关业务之间既紧密联系又相互隔离的矛盾。  相似文献