套管开窗侧钻技术在水井施工中的应用     

王永全王玉春  梁凤河张书平 崔秀忠 《中国煤田地质》2007,19(A01):78-80,91

套管开窗侧钻技术是处理井内复杂情况的一种有效手段，某地热井在完井抽水后，因取水段岩层垮塌造成取水井段堵塞，采用冲、扫、捞、等方法处理均无效，地热井几近报废，后采用该技术手段，使该井顺利竣工。  相似文献   

非饱和土的一种分类方法     

李顺群  崔春义  郑刚 《岩土工程技术》2007,21(3):134-138

根据理想模型中土颗粒和孔隙水之间的几何关系、热力学原理和土力学基本理论,研究了土的非饱和性在非饱和土中引起的力系。给出了张力吸力和吸力比的定义,并在考虑基质吸力作用面积的基础上定义了等效吸力的概念。按照孔隙水弯液面是否与土颗粒表面搭接,将非饱和土分为搭接非饱和土和不搭接非饱和土两类。进而根据搭接状态将搭接非饱和土细分为水封闭非饱和土和搭接双开敞非饱和土,根据孔隙气状态将不搭接非饱和土细分为不搭接双开敞非饱和土和气封闭非饱和土。在搭接非饱和土中,出现张力吸力并对土体的强度产生增强作用;在不搭接非饱和土中,表面张力只是沿着液面传播,不对土的强度产生效应。另外,张力吸力只对强度问题有贡献,它不是渗流问题的驱动力。  相似文献   

Geochemistry of meta-volcanic rocks from the Longbohe Cu deposit, Yunnan Province, China： Implications for the genesis and tectonic setting     

CUI Yinliang QING Dexian CHEN Yaoguang 《中国地球化学学报》2007,26(3):312-324

The Longbohe Cu deposit, which is located in the southern part of the Honghe ore-forming zone, Yunnan Province, China, belongs to a typical ore field where volcanic rocks are of wide distribution and are associated with Cu mineralization in time and space. The volcanic rocks in the ore field, which have experienced varying degree of alteration or regional metamorphism, can be divided into three types, i.e., meta-andesite, meta-subvolcanic rock and meta-basic volcanic rock in accordance with their mineral assemblages. These three types of volcanic rocks in the ore field are relatively rich in Na and the main samples plot in the area of alkali basalts in the geochemical classification diagram. With the exception of very few elements, these three types of volcanic rocks are similar in the content of trace elements. In comparison to the basalts of different tectonic settings, the meta-volcanic rocks in the ore field are rich in high field strength elements (HFSE) such as Th, Nb, etc. and depleted in large ion lithophile elements (LILE) such as Sr, Ba, etc. and their primary mantle-normalized trace element patterns show remarkable negative Th and Nb anomalies and negative Sr and Ba anomalies. These three types of volcanic rocks are similar in REE content range and chondrite-normalized REE patterns with the exception of Eu anomaly. Various lines of evidence show that these three types of volcanic rocks in the ore field have the same source but are the products of different stages of magmatic evolution, their original magma is a product of partial melting of the metasomatically enriched mantle in the tensional tectonic setting within the continent plate, and the crystallization differentiation plays an important role in the process of magmatic evolution.  相似文献   

Application of Adaptive Kalman Filtering Algorithm in IMU/GPS Integrated Navigation System   总被引：5，自引：0，他引：5  

GAO Weiguang YANG Yuanxi CUI Xianqiang ZHANG Shuangcheng 《地球空间信息科学学报》2007,10(1):22-26

The IMU(inertial measurement unit) error equations in the earth fixed coordinates are introduced firstly. A fading Kalman filtering is simply introduced and its shortcomings are analyzed, then an adaptive filtering is applied in IMU/GPS integrated navigation system, in which the adaptive factor is replaced by the fading factor. A practical example is given. The results prove that the adaptive filter combined with the fading factor is valid and reliable when applied in IMU/GPS integrated navigation system.  相似文献   

图文一体化的土地办公信息系统设计探讨     

杨克  华璀  闫志刚  童新华 《四川测绘》2007,30(5):203-206

文章提出土地办公信息系统的概念,并对近年来其建设进展做了一些简要回顾,认为应对具体业务的图文一体化土地办公信息系统开展研究。并以土地权属协议书办公软件的设计与实现为例,文章结合实际开发小而灵活的办公软件,具有借鉴意义。  相似文献   

用方差分析法预测濮阳市冬小麦播种期降水量趋势   总被引：1，自引：0，他引：1       下载免费PDF全文

王春玲 崔力王树文  李改琴时凤云刘平  董建设 《气象与环境科学》2007,30(B09):123-125

使用1971--2000年濮阳市冬小麦播种期降水量资料，采用方差分析法，按不同长度周期进行排列，求出各个周期的F值，进行F检验定出第一周期，其位相值为第一周期的第一次值。将原序列减去第一周期的位相值作为新序列1，对新序列1再进行不同长度周期排列，求出各个周期的F值，再进行F检验定出第二周期。对第一、二周期进行稳定性检查，采用经稳定后的第一、二周期的第2次值各自外推，求出预报初值，计算出剩余方差，建立预报方程，进而可计算出降水量预报值。经回代检验，历史拟合率为30／30=100％；2001—2005年试报准确率为4／5=80％。  相似文献   

南极海冰北界涛动指数及其与我国夏季天气气候的关系   总被引：2，自引：0，他引：2       下载免费PDF全文

马丽娟陆龙骅  卞林根 《应用气象学报》2007,18(4):568-572

南极海冰的变化和全球大气环流关系密切。南极各区海冰的不同变化, 对南北半球大气环流有着不同的影响。文中基于对南极海冰变化的客观分区, 定义了南极海冰北界涛动指数 (ASEOI), 并结合中央气象台提供的南方涛动指数、北半球500 hPa和100 hPa高度场资料以及我国160站降水、温度资料, 利用诊断分析方法, 对ASEOI与我国夏季天气气候的关系进行了研究。研究表明:ASEOI对我国长江中下游降水及全国大部分地区温度具有指示意义。若前一年10月ASEOI偏低, 则当年7月我国长江中下游降水偏多, 引发洪涝灾害的可能性很大; 温度场上, 我国北方气温偏高, 南方气温偏低, 而高温往往伴随着少雨, 这无疑会加剧华北本就严重的旱情。  相似文献   

Validating the Runoff from the PRECIS Model Using a Large-Scale Routing Model   总被引：4，自引：0，他引：4  

曹丽娟  董文杰  许吟隆  张勇 《大气科学进展》2007,24(5):855-862

The streamflow over the Yellow River basin is simulated using the PRECIS （Providing REgional Climates for Impacts Studies） regional climate model driven by 15-year （1979-1993） ECMWF reanalysis data as the initial and lateral boundary conditions and an off-line large-scale routing model （LRM）. The LRM uses physical catchment and river channel information and allows streamflow to be predicted for large continental rivers with a 1°×1° spatial resolution. The results show that the PRECIS model can reproduce the general southeast to northwest gradient distribution of the precipitation over the Yellow River basin, The PRECIS- LRM model combination has the capability to simulate the seasonal and annual streamflow over the Yellow River basin. The simulated streamflow is generally coincident with the naturalized streamflow both in timing and in magnitude.  相似文献   

A Simple Shear Model for the Asymmetry in the Paleoproterozoic Fold Belt in Liaodong Peninsula     

Cui Yingchun  Liu Junlai  Ma Lijie  Guan Huimei 《世界地质(英文版)》2001,4(1)

Several aspects of the Liaodong Paleoproterozioc fold belt, including its components, tectonic, metamorphic and magmatic characteristics are discussed in the paper, with emphasis on the asymmetry of the fold belt and differences between the northern lineal - fold belt and the southern dome - fold belt. It is suggested that the fold belt is one magrnatic passive margin, instead of a rift zone or the classical passive continental margin. The formation and evolution of the fold belt is discussed with a simple shear model, which may best explain the co - existence of contemporaneous tectonic facies with different characteristics, the volcanic and plutonic activities, sedimentary formations and their geological attributes etc.  相似文献   

Characteristics of vertical ozone distribution in the lower troposphere in the Yangtze River Delta at Lin’an in the spring of 2001   总被引：4，自引：0，他引：4  

ZHENG Xiangdong  CHAN Chuenyu  CUI Hong  QIN Yu  CHAN Loyan  ZHENG Yongguang & LEE Yusiang . Chinese Academy of Meteorological Sciences  Beijing  China  . Department of Civil  Structural Engineering  Hong Kong Polytechnic University  Hung Hom  Hong Kong  China  . Department of Atmospheric Sciences  Peking University  Beijing  China 《中国科学D辑(英文版)》2005,48(9):1519-1528

Deterioration of air quality as a result of rapid eco- nomic development in the Yangtze River Delta (YRD) has attracted much scientific and public attention[1―7]. To explore the air quality of a region, measurement of pollutants in locations reflecting the “background” atmospheric conditions of the region is essential. The Regional Baseline Air Quality Monitoring Station of the Chinese Academy of Meteorological Sciences (CAMS) at Lin’an is located in such an area in Zhe- jiang Pro…  相似文献