Research on temporal and spatial distribution, evolutionary character and mechanism of crustal deformation field before and after the Tangshan earthquake   总被引：2，自引：0，他引：2  

周硕愚  施顺英  帅平 《地震学报(英文版)》1997,10(6):693-701

Ｒｅｓｅａｒｃｈｏｎｔｅｍｐｏｒａｌａｎｄｓｐａｔｉａｌｄｉｓｔｒｉｂｕ┐ｔｉｏｎ,ｅｖｏｌｕｔｉｏｎａｒｙｃｈａｒａｃｔｅｒａｎｄｍｅｃｈａｎｉｓｍｏｆｃｒｕｓｔａｌｄｅｆｏｒｍａｔｉｏｎｆｉｅｌｄｂｅｆｏｒｅａｎｄａｆｔｅｒｔｈｅＴａｎｇｓｈａｎ...  相似文献   

TOWARD ESTABLISHING THE CONCEPT OF PHYSICAL URBAN AREA IN CHINA   总被引：1，自引：0，他引：1  

Zhou Yixing  Shi Yulong 《地理学报(英文版)》1995,(4)

I.IntroduchollWiulegeOgraphystudiestheterritoria1systemsabouttherelationsbforeenhumanbeingSandthenature[I4],urbanmpaphyfocusesspecificallyonthespatialoopltizationandprocessofurbanterritory,anditsinteraCtionwiti1Otherterritorialsystems.Usually,wedoresearch…  相似文献   

成都城市发展对热岛强度影响的主成份回归分析     

石凤云  唐佑民 《成都信息工程学院学报》1991,(Z1)

本文对成都市总人口、建成区面积等11个因子、作了主成份回归L-S估计和M-估计,讨论了成都城市发展对“热岛”强度的主要影响因子。结果表明,城区房屋建筑面积及总人口数是影响城市气候(气温)的主要因子,其次为城市人口总户数、建成面积等。 文中,对回归方程进行了拟合计算,回归效果比较满意(尤其是稳健回归)。  相似文献   

城市河岸土地利用对河流廊道功能影响初探——以上海苏州河为例   总被引：1，自引：0，他引：1  

陈婷  杨凯 《世界地理研究》2006,15(3):82-87

城市河岸土地利用往往改变河岸的自然地理条件,对城市河流功能产生影响。通过总结城市河岸廊道功能以及国内外城市河岸规划土地利用的实践,分析了河岸土地利用对城市河流廊道功能的影响,并以上海苏州河为例进行了实证分析。结果表明,苏州河河岸规划土地利用方式提高了河岸开放带宽度,改善了河岸舒适性,控制了河岸建筑高度,有利于保护和开发苏州河河流的景观、遗产和经济廊道的功能。干流河岸在自然廊道功能方面,仍存在一定缺陷,与支流的部分河段相比仍有差距。  相似文献   

Effect of polypropylene fibre and lime admixture on engineering properties of clayey soil   总被引：2，自引：0，他引：2  

Yi Cai  Bin Shi  Charles W.W. Ng  Chao-sheng Tang 《Engineering Geology》2006,87(3-4):230-240

In order to reduce the brittleness of soil stabilized by lime only, a recent study of a newly proposed mixture of polypropylene fibre and lime for ground improvement is described and reported in the paper. To investigate and understand the influence of the mixture of polypropylene fibre and lime on the engineering properties of a clayey soil, nine groups of treated soil specimens were prepared and tested at three different percentages of fibre content (i.e. 0.05%, 0.15%, 0.25% by weight of the parent soil) and three different percentages of lime (i.e. 2%, 5%, 8% by weight of the parent soil). These treated specimens were subjected to unconfined compression, direct shear, swelling and shrinkage tests. Through scanning electron microscopy (SEM) analysis of the specimens after shearing, the improving mechanisms of polypropylene fibre and lime in the soil were discussed and the observed test results were explained. It was found that fibre content, lime content and curing duration had significant influence on the engineering properties of the fibre–lime treated soil. An increase in lime content resulted in an initial increase followed by a slight decrease in unconfined compressive strength, cohesion and angle of internal friction of the clayey soil. On the other hand, an increase in lime content led to a reduction of swelling and shrinkage potential. However, an increase in fibre content caused an increase in strength and shrinkage potential but brought on the reduction of swelling potential. An increase in curing duration improved the unconfined compressive strength and shear strength parameters of the stabilized soil significantly. Based on the SEM analysis, it was found that the presence of fibre contributed to physical interaction between fibre and soil whereas the use of lime produced chemical reaction between lime and soil and changed soil fabric significantly.  相似文献   

C++Builder结合Matlab在测量数据处理中的应用     

何凯  杨立君  陈德志 《北京测绘》2005,(2):36-39

根据测量数据处理的特点,通过对C++Builder6.0和MATLAB特点的分析,得出C++Builder6.0和MATLAB语言两者结合,能够大大提高测量数据处理效率。详细介绍了一种以C++Builder为系统开发平台,利用MATLAB进行测量数据处理的过程。并列举平差程序的一部分源码供参考。  相似文献   

QTPV Data Model and Algorithm and Its Application to Geological Exploration Engineering     

CHENGPenggen SHIWenzhong GONGJianya ZHOUGuoqing 《地球空间信息科学学报》2005,8(1):64-71

3D spatial data model and simulating are the core of 3D GIS can be adopted in different domains. A data model based on Quasi Tri-Prism Volume (QTPV) has been proposed. QTPV definition and its special cases have been discussed. Using QTPV and its special cases, irregular natural geological bodies and regular subsurface engineering can be described efficiently. The proposed model is composed of five primitives and six objects. Data structures and topological relationship of the fives primitives and three objects describing stratigraphy are designed in detail Some schemes are designed for the QTPV modelling of stratigraphy and subsurface engineering according to modelling data. The model manipulation method of QTPV cutting by an arbitrary plane is discussed. Using VC 6.0 programming language integrated with SQL database and OpenGL graphic library under windows environment, a system prototype 3DGeoMV has been developed. The experiment result shows that the QTPV model is feasible and efficient in modelling subsurface engineering.  相似文献   

东昆仑阿尼玛卿地区古特提斯火山作用和板块构造体系   总被引：37，自引：0，他引：37  

杨经绥许志琴  李海兵史仁灯 《岩石矿物学杂志》2005,24(5):369-380

东昆仑阿尼玛卿蛇绿岩带标志古特提斯洋关闭后的板块缝合带。在该缝合带及周围识别出4套与洋盆扩张和俯冲作用有关的火山岩,由南至北,分别为洋底玄武岩、岛弧火山岩、弧后盆地玄武岩和后碰撞火山岩。板块构造体系说明洋壳俯冲极性从南向北。已有年代学证据表明:阿尼玛卿洋盆的开启时代至少可以早到晚石炭世(308Ma),洋盆关闭可能在早三叠世;岛弧火山岩的时代为晚二叠世(260Ma);弧后盆地火山岩的时代为早中三叠世;后碰撞火山岩的时代为晚三叠世。三叠纪沿缝合带及其北部形成了一系列巨大的左旋走滑断裂系,包括东昆仑南缘左旋走滑断裂(200~220Ma)、阿尔金断裂的早期走滑剪切断裂系(220~230Ma)以及南祁连南缘巨型左旋走滑断裂(240~250Ma)。认为它们形成于阿尼玛卿古特提斯洋的关闭和斜向碰撞作用,但主要在俯冲板块折返阶段或逆冲岩片的抬升阶段,其时也是后碰撞岩浆活动和火山喷发阶段。  相似文献   

胶北晚中生代煌斑岩的岩石地球化学特征及其成因研究   总被引：16，自引：5，他引：16  

刘燊胡瑞忠赵军红  冯彩霞钟宏曹建劲史丹妮 《岩石学报》2005,21(3):947-958

胶北煌斑岩分别采自龙口、烟台和威海地区，包括拉辉煌斑岩、斜闪正煌岩和角闪煌斑岩，煌斑岩K—Ar全岩年龄变化于89．3～169．5Ma，为晚中生代岩浆活动的产物。在岩石化学组成上，SiO2=42．02％～54．95％，以钙碱性系列为主．岩石以富集大离子亲石元素（LILE）（Ba，U，K，Th）和LREE，亏损高场强元素（HFSE）（Nb，Ta和Ti）为特征，Mg^#=33．9～53．9，Eu／Eu^＊=0．71～0．89，^87Sr／^86Sr初始比值0．707642～0．709791，εNd（t）为-17．6～-10．4，^206Pb／^204Pb=37．588～38．431，^207Pb／^204Pb=15．423～15．531，^206Pb／^204Pb=17．204～18．179。表明煌斑岩源自俯冲陆壳（扬子下地壳）在地幔源区发生交代作用时形成的富集型地幔的部分熔融体．考虑到煌斑岩具有大陆边缘弧玄武岩的特征，我们认为煌斑岩在成因上同样与古大洋板块的俯冲作用有关，为碰撞后弧岩浆作用形成的脉岩。  相似文献   

CAPPS多箱模式中光化学模式的嵌套与城市大气臭氧数值预报   总被引：3，自引：2，他引：3       下载免费PDF全文

张恺 徐大海朱蓉  陈军明 《应用气象学报》2005,16(1):1-12

为解决城市边界层中大气O₃浓度的预报问题，选用一种简明有效的光化学反应方案建立光化学模式, 并与大气平流扩散的箱格预报模型进行了嵌套，从而将大气化学过程引入到城市空气污染数值预报系统 (CAPPS) 中。同时，根据实际需要研究了VOC (Volatile Organic Compounds) 浓度及NO_x源排放量等参数缺测时，根据前期监测浓度采用遗传算法反演未知参数的具体方法。利用2001年9月8~17日在北京舞蹈学院监测的O₃、NO_x资料及相应的气象数据，用改进后的CAPPS模式进行了单箱预报试验。预报试验结果表明，嵌套后的模式对O₃浓度的变化具备一定的预报能力。  相似文献