足尺变刚度控制系统性能试验与计算模型     

李敏霞  欧进萍  王刚  桂丽萍 《地震工程与工程振动》2000,20(4):96-100

本文充分考虑了实际工程应用中的诸多因素,成功地研制了40吨足尺变刚度控制系统并对其进行了性能试验,实现了模型试验到实用样机的转化,性能试验结果表明,该足系统的性能满足各项设计技术要求,系统滞回曲线说明系统充分发挥了可变刚度的吸能,释能减振控制作用,在此基础上,文中研究了足尺系统的设计与控制算法,试验工况与试验结果以及计算模型。  相似文献   

Immature Oils in China and Their Genetic Mechanisms     

WANG Tieguan 《《地质学报》英文版》2000,74(3):632-640

Immature crude oils are a kind of unconventional petroleum resources. They are generated through early low-temperature biochemical/chemical reactions of some specific organic matter. Their geological reserves explored are as high as several hundred million tons in China. Based on a detailed organic geochemical study, five genetic mechanisms of immature oils have been proposed in this paper for early hydrocarbon generation from suberinite, resinite, bacteria-reworked terrestrial organic matter, biolipids and sulphur-rich macromolecules respectively.  相似文献   

Geology, Genetic Types and Metallogeny of Gold Deposits in the Eastern Tianshan, Xinjiang     

FENG Jianzhong  ZENG Yishan  FU ShuixingPeking University  Beijing Beijing Institute of Geology for Mineral Resources  Andingmenwai  Beijing 《《地质学报》英文版》2000,74(3):559-564

As a typical Palaeozoic island arc system, the eastern Tianshan area, Xinjiang, is different from eastern China but similar to the Meso-Cenozoic island arc metallogenic provinces along the coast of the Pacific Ocean in metallogenic environment, geology and geochemistry. Three types of gold deposits, ductile shear zone-hosted gold deposits (Kanggur ), magmatic hydrothermal gold deposits (Jinwozi) and volcanic- or subvolcanic-hosted gold deposits (Xitan and Mazhuangshan), have been identified in this area. Regionally, gold deposits are structurally controlled by the Kanggur Tag ductile shear zone, Shaquanzi fault, Hongliuhe fault and Yamansu fault. Generally, gold mineralization occurs in the transition zones from volcanic rocks to sedimentary rocks. The horizon bearing well-developed jasper is an important indicator for gold mineralization. Each of the three types of gold deposits has its distinctive metallogenic background and geological-geochemical characteristics.  相似文献   

Determination of 3-D Velocity Anomalies of the Nanbei Tectonic Zone of China Based on Local Earthquakes     

CHANG Xu  LIU YikeInstitute of Geology  Geophysics  Chinese Academy of Sciences  All  Datun Ro  Chaoyang District  Beijing  E-mail: changxu@mail.c-geos.ac.cn 《《地质学报》英文版》2000,74(1):102-112

In this paper, 3-D velocity images of the crust and upper mantle beneath the Nanbei tectonic zone of China are constructed using P-wave travel time residuals of earthquakes, with the data supplied by China's seismic networks and the International Seismic Centre.During the model parameterization in the tomographic inversion the interpolation function of grid node velocities is used as the space function of velocity, and the velocity function is allowed to be discontinuous. The difficulties caused by large memory demand and high computing cost in solving the system of equations are avoided by utilizing the least squares QR decomposition algorithm. Thus, the stability of the algorithm is ensured. Though resolution images are not derived in the inversion process based on the resolution theory of Backus and Gilbert, a covariance resolution method is put forward by the authors. The resolution analyses have proved the reliability of the image results. 3-D ray tracing is conducted to obtain the ray paths in a s  相似文献   

BASIN-RANGE TRANSITION AND GENETIC TYPES OF SEQUENCE BOUNDARY OF THE QIANGTANG BASIN IN NORTHERN TIBET     

Yin Fuguang  Xu Xiaosong 《地学前缘》2000,(Z1)

BASIN-RANGE TRANSITION AND GENETIC TYPES OF SEQUENCE BOUNDARY OF THE QIANGTANG BASIN IN NORTHERN TIBET  相似文献   

多尺度逐次逼近遗传算法反演大地电磁资料   总被引：44，自引：15，他引：29       下载免费PDF全文

师学明  王家映  张胜业  胡祥云 《地球物理学报》2000,43(1):122-130

遗传算法是一种随机全局搜索算法,与常规的基于局部线性化的最优化方法相比对初始模型的依赖性大为减弱,但是存在着有效基因丢失和早熟收敛问题．采用多尺度逐次逼近反演思想而建立的多尺度逐次逼近遗传算法,能有效地解决上述问题．用该算法对大地电磁资料进行反演,理论曲线和实测资料的试算结果表明多尺度逐次逼近遗传算法能够自动反演地电参数．  相似文献   

遗传算法在组分温度反演中的应用   总被引：1，自引：1，他引：0  

庄家礼  徐希孺 《国土资源遥感》2000,11(1):28-33

介绍了遗传算法的主要内容和工作原理。在连续植被热辐射方向性模型的基础上,从热红外多角度遥感数据中,同时反演混合像元组分温度、土壤比辐射率以及叶面积指数。大量试验表明,利用遗传算法反演组分温度效果非常好。在宽松的先验知识条件下,该方法可以解决不确定性反演问题  相似文献   

陆面温度反演算法——劈窗算法的敏感度分析     

张霞  朱启疆  闵祥军 《遥感学报》2000,4(1):8-13

首先给出ＣＯ２ 倍增下遥感光合作物产量的概念模型,之后分析未受ＣＯ２ 倍增的遥感光合作物产量估测模型;在考虑ＣＯ２ 倍增对作物产量的影响后,对影响干物质累积的作物光合速率的模型进行修正,进而修正遥感光合作物产量估测模型。建立ＣＯ２ 倍增下作物产量响应模型,求取各参数,并在ＣＯ２ 倍增下对我国华北地区冬小麦产量响应进行填图,表明模型的估测结果有良好的可比性。  相似文献   

求解Radon变换改进Fourer算法的误差分析     

张铁  阎家斌 《CT理论与应用研究》2000,9(1):12-16

本文将对求解Ｒａｄｏｎ变换的改进Ｆｏｕｒｉｅｒ算法进行误差分析,证明了在Ｌ２范数下改进Ｆｏｕｒｉｅｒ算法是收敛的且具有Ｏ（１／ｑ）敛阶,其中２ｑ为像素点矩陈阶数。  相似文献   

Genetic and morphological variation in the endangered crayfish species, Austropotamobius pallipes (Lereboullet) (Crustacea, Astacidae) from the Poitou-Charentes region (France)     

Frédéric Grandjean  Catherine Souty-Grosset 《Aquatic Sciences - Research Across Boundaries》2000,62(1):1-19

  相似文献