GS—15型重力仪滤波效能与观测稳定性的对比分析     

杨又陵  蔚晓利 《内陆地震》1998,12(3):215-221

通过观察和模拟干扰源试验,认为红山地震台ＧＳ－１５型重力仪潮汐观测曲线畸变和观测精度氏是因原配ＲＣ滤波电路的抗干扰能力差。用自制的有源贝赛尔滤波电路取代原配ＲＣ滤波电路后,观测质量得到了根本的改善,一系列参量的分析表明,ＧＳ型重力仪弹性系统手换能电路性能优良,有源滤波电路具有很强的抗干扰能力,使用数字记录代替模拟记录可以减小记录系统非线性失真,提高潮汐分析的精度和稳定性。  相似文献   

吴忠,灵武地区地壳中上部速度结构   总被引：1，自引：0，他引：1  

赵卫明  金延龙 《内陆地震》1998,12(3):256-262

应用射线追踪方法进行震源参数和速度结构联合反演,对宁夏吴忠、灵武地区地壳中上部Ｐ波速度结构进行了研究,茯结果与目前该区域地震定位所用的速度模型差异较大,与穿研究区的人工地震剖面相比,随深度的增加两者的速度值趋于一致。  相似文献   

尺度参数的Lp估计与精度评定   总被引：3，自引：0，他引：3  

周世健  陈永奇  邓康伟 《测绘学报》1998,27(4):300-307

根据定位参数与尺度参数的联合Ｍ估计,导出了尺度参数的Ｌｐ估计;当ｐ＝２时,与最小二乘估计一致,观测数据服从正态分布时,为最优无偏估计;由于尺度参数Ｌｐ估计的影响函数为无界函数,估计不具抗差性,但把残差Ｗｉｎｓｏｒ化,作者得到了尺度参数的抗差Ｌｐ估计;依据定位参数的协方差阵,可进行Ｌｐ估计的精度评定。这些结果对于Ｌｐ估计的研究和应用具有一定的参考价值。  相似文献   

基于互补性参数的港湾初级生产力遥感及GIS探测模型   总被引：2，自引：0，他引：2  

陈晓翔  邓孺孺  何执兼 《遥感学报》1998,2(4):276-279

到目前为止,港湾初级生产力的遥感探测方法基本上集中在对叶绿素的光谱探测上,由于干扰因素的存在（海面波动,水中悬浮泥砂）,使遥感探测的精度受到影响。本文提出一种基于地理信息系统方法的具有互补性参数的港湾初级生产力遥感探测模型,由于互补性参数的存在,极大地提高了模型的抗干扰能力,使探测的精度得到明显改善。在广东大亚湾的初步试验表明：水交换状态参数的引用,模型的误差从６．５％降为０．２６％,精度大大提高,从而证明该方法的可行性和有效性。  相似文献   

1997年1月21日～4月16日新疆伽师强震群综述     

陈保华  叶民权 《国际地震动态》1998,(1):26-30

１９９７年１月２１日～４月１６日,新疆伽师相继发生了７次Ｍ≥６的地震,造成了破坏与伤亡。该文就伽师强震群进行了综述,包括：地震类型和地震参数;震源机制;伽师地震的临震预报;地震现场工作等。  相似文献   

结构被动耗能减振效果的参数影响   总被引：58，自引：6，他引：52  

欧进萍  吴斌  龙旭 《地震工程与工程振动》1998,18(1):60-70

本文研究粘滞、粘弹、金属屈服和摩擦型上类与斜撑串联的被动耗能器对结构减振效果的参数影响。首先,建立了结构、耗能器和斜撑共同工作的计算模型;然后考虑不同耗能器的特点,给出了相应的运动方程;第三,通过大量的数值计算,研究了耗能器刚度（或耗能器与斜撑的组合刚度）、屈服位移等参数对结合减振结果的影响,得到了这些参数的最佳取值范围,从而为结构的耗能减振设计提供了基础。  相似文献   

动态随机有限元法   总被引：12，自引：0，他引：12  

赵雷  陈虬 《地震工程与工程振动》1998,18(1):1-7

本提出分析了不确定性结构随机动力响应的一种新的数据方法－－动态随机有限元法。经的特点是引入反映结构振动特征的动态形函数,中引出了相应的计算列式。算例表明,本方法的计算效率及数值精度均优于一般的随机有了限元法,具有应用前景。  相似文献   

Inversion of source process and related studies of the Taiwan Strait earthquake using genetic algorithm     

王海军  林邦慧  陈诗安  林奕山 《地震学报(英文版)》1998,(2)

ＩｎｖｅｒｓｉｏｎｏｆｓｏｕｒｃｅｐｒｏｃｅｓａｎｄｒｅｌａｔｅｄｓｔｕｄｉｅｓｏｆｔｈｅＴａｉｗａｎＳｔｒａｉｔｅａｒｔｈｑｕａｋｅｕｓ－ｉｎｇｇｅｎｅｔｉｃａｌｇｏｒｉｔｈｍＨＡＩ－ＪＵＮＷＡＮＧ１）（王海军）ＢＡＮＧ－ＨＵＩＬＩＮ１）（林邦慧...  相似文献   

Kalman filtering in groundwater flow modelling: problems and prospects     

U. Eigbe  M. B. Beck  H. S. Wheater  F. Hirano 《Stochastic Environmental Research and Risk Assessment (SERRA)》1998,12(1):15-32

The popularity of applying filtering theory in the environmental and hydrological sciences passed its first climax in the 1970s. Like so many other new mathematical methods it was simply the fashion at the time. The study of groundwater systems was not immune to this fashion, but neither was it by any means a prominent area of application. The spatial-temporal characteristics of groundwater flow are customarily described by analytical or, more frequently, numerical, physics-based models. Consequently, the state-space representations associated with filtering must be of a high order, with an immediately apparent computational over-burden. And therein lies part of the reason for the but modest interest there has been in applying Kalman filtering to groundwater systems, as reviewed critically in this paper. Filtering theory may be used to address a variety of problems, such as: state estimation and reconstruction, parameter estimation (including the study of uncertainty and its propagation), combined state-parameter estimation, input estimation, estimation of the variance-covariance properties of stochastic disturbances, the design of observation networks, and the analysis of parameter identifiability. A large proportion of previous studies has dealt with the problem of parameter estimation in one form or another. This may well not remain the focus of attention in the future. Instead, filtering theory may find wider application in the context of data assimilation, that is, in reconstructing fields of flow and the migration of sub-surface contaminant plumes from relatively sparse observations. Received: October 27, 1997  相似文献   

Micro-sequential contour blasting—how does it influence the surrounding rock mass?     

Agne P. Rustan 《Engineering Geology》1998,49(3-4):303-313

The optimal delay time between the contour holes in rock blasting has been studied by theoretical and empirical research in Sweden, regarding ground vibrations, increase in crack frequency, radial crack length and finally overbreak (half cast factor). The model test presented in this paper concerns controlled contour blasting in tunnelling and the full-scale blasts concern tunnelling, road cutting, and dimensional stone quarrying. The results indicate that the microsequential contour blasting technique (contour holes fired in sequence and with a delay in the order of 1–2 ms) is superior to simultaneous initiation both regarding blast-induced ground vibrations and crack frequency increase in the rock mass. Both these evaluation methods reflects the conditions deeper in the remaining rock mass. Simultaneous initiation, however, is superior to micro-sequential contour blasting both regarding the half cast factor and the length of radial cracks emanating from the blastholes. These two parameters are more related to the surface conditions after blasting. The industrial applications of this new knowledge are the use of micro-sequential contour blasting when ground vibrations are of greater concern than the contour, for example, in trench blasting or quarrying in urban areas, and the use of simultaneous initiation when an even rock surface is of high priority.  相似文献