屏障隔振系统失效机理的探讨          下载免费PDF全文

邱畅  高广运  岳中琦  谭国焕 《地震工程学报》2003,25(3):198-203

屏障隔振是一种用来阻碍或改变外围振波向受保护区(屏蔽区)传播的工程方法，由于其机理的探讨尚不深入，工程实践中常出现隔振系统失效的现象．本假设屏障是埋入土介质的中厚弹性板，采用薄层法分析了该弹性板在振波作用下的振动响应和屏蔽区内位移变化规律；研究了影响屏障隔振效果的主要参量；发现了使屏障隔振效率降低甚至失效的入射波全透射现象．结果表明柔性屏障易发生波的全透射，并指出了避免屏障失效的措施．  相似文献   

利用全数字摄影测量方法生产1:1万基础地理信息数据的方法探讨     

罗冀华 《测绘技术装备》2003,5(2):32-33

介绍了利用全数字摄影测量工作站制作3D产品制作过程中的经验技巧和方法,仅供同行参考.  相似文献   

努力为北京奥运、城建提供测绘保障     

洪立波 《北京测绘》2003,(1):3-6,11

简介北京奥运城市建设信息概况 ,提出努力为“奥运”提供多方位测绘保障服务的设想。  相似文献   

《星载合成孔径雷达干涉测量》简介     

萧月 《测绘信息与工程》2003,28(5):49-49

作为有源系统 ,合成孔径雷达(SAR)具有全天候、全天时工作能力 ,可在不同的微波频段 ,不同极化状态下得到地面目标的高分辨率图像 ,广泛地应用于地形测绘、地质勘探、防灾减灾 ,农林生产和海洋研究等各个领域。合成孔径雷达干涉测量技术 (InSAR)是利用合成孔径雷达的相位信息 ,提取地表的三维信息和高程变化信息的一项技术。它能获取高精度的地形信息 ,同时还可以监测地球陆地表面和冰雪表面的微小变化 ,监测的时间间隔从几天到几年 ,可以获得全球高精度的 (毫米级 )、高可靠性(全天时、全天候 )地表变化的信息。由于其可以直接从空中测…  相似文献   

对目前岩石“全曲线”测试的若干看法   总被引：1，自引：0，他引：1  

马世民  马宇博 《岩土力学》2003,(Z1)

从电液伺服岩石压力试验机工作机理的角度,对目前岩石应力-应变全过程曲线(以下简称“全曲线”)测试中的一些问题进行了分析,提出了自己的看法,目的是为了解决“全曲线”测试的2个问题,即如何测出“全曲线”;如何使测出的“全曲线”真实反映岩石的力学特性,并将其用到工程中。  相似文献   

Theory and Method of Mineral Resource Prediction Based on Synthetic Information     

WangShicheng YeShuisheng ZhouDongdai 《中国地质大学学报(英文版)》2003,14(3):207-214

Metallogenic prognosis of synthetic information uses the geological body and the miaeral resource body as a statistical unit to interpret synthetically the information of geology, geophysics, geo-chemistry and remote sensing from the evolution of geology and puts all the information into one entire system by drawing up digitalized interpretation maps of the synthetic information. On such basis, differ-ent grades and types of mineral resource prospecting models and predictive models of synthetic informa-tion can be established. Hence, a new integrated prediction system will be formed of metallogenic prog-nosis (qualitative prediction), mineral resources statistic prediction (determining targets) and mlaeral resources prediction (determining resources amount).  相似文献   

Theoretical Study on Stochastic Modeling of Combined Gravity-Magnetic-Electric-Seismic Inversion and Its Application     

YanHanjie YanHong LiYunping ZhangXiaofeng 《中国地质大学学报(英文版)》2003,14(3):227-233

As gravity field,magnetic field,electric field and seismic wave field are all physical fields,their object function,reverse function and compound function are certainly infinite contiuously differentiable func-tions which can be expanded into Taylor (Fourier) series within domain of definition and be further reduced in-to solving stochastic distribution function of series and statistic inference of optimal approximation,This is the basis of combined gravity-magnetic-electric-seismic inversion built on the basis of separation of field and source gravity-magnetic difference-value(D-value)trend surface,taking distribution-independent fault sys-tem as its unit,depths of seismic and electric interfaces of interests as its corresponding bivariate compound re-verse function of gravity-magnetic anomalies and using high order polynomial(high order trigonometric func-tion)approximating to its series distribution,The difference from current dominant inversion techniques is that,first,it does not respectively create gravity-seismic,magnetic-seismic deterministic inversion model from theoretical model,but combines gravity-magnetic-electric-seismic stochastic inversion model from stochastic model;second,after the concept of equivalent geological body being introduced,using feature of independent variable of gravity-magnetic field functions,taking density and susceptibility related to gravity-magnetic func-tion as default parameters of model,the deterministic model is established owing to better solution to the con-tradictioc of difficulty in identifying strata and less test analytical data for density and susceptibility in newly explored area;third,under assumption of independent parent distribution,a real modeling by strata,the prob-lem of difficult plane closure arising in profile modeling is avoided,This technology has richer and more detailed fault and strata information than sparse pattern seismic data in newly explored area,successfully inverses and plots structural map of Indosinian discontinuty in Hefei basin with combined gravity-magnetic-electric-seismic inversion,With development of high precision gravity-magnetic and overall geophysical technology,it is certain for introducing new methods of stochastic modeling and computational intelligence and promoting the develop-ment of combined gravity-magnetic-electric-seismic inversion to open a new substantial and promoting the develop-ment of combined gravity-magnetic-electric-seismic inversion to open a new substantial path.  相似文献   

用非线性多因子动态组合方法作降水概率预报   总被引：1，自引：0，他引：1       下载免费PDF全文

邵明轩刘凤辉  程维中魏建明窦以文  陈大刚 《气象科技》2003,31(4):206-210

将逐时段定点降水预报这个以往一般作为非连续量处理的预报问题转化为对一个连续的降水可能函数的预报问题。降水可能函数为一由实况值确定的函数。因为现在模式变化较快，且许多因子和降水可能函数为非线性关系，文章采用一种新的非线性多因子动态组合方法，通过对降水可能函数的预报，作客观分站降水概率预报。  相似文献   

全数字摄影测量中的内业地物量测     

陈玲 《现代测绘》2003,(Z1)

本文就运用Virtuozo V3.3全数字摄影测量系统采集地物的内容、方法和一些技巧,以及对如何合理、准确地量测地物进行了探讨。  相似文献   

全数字化摄影测量系统(VirtuoZo NT)     

白杉  子荫 《全球定位系统》2003,28(3):52-52

全数字化摄影测量系统VirtuoZo NT作为可以直接从数字影像中获取测绘信息的软件平台是一个全软件化设计、功能齐全、高度智能化的摄影测量解决方案,可提供从自动空中三角测量到测绘地形图的整体作业流程。VirtuoZo NT采用国际最先进的超快速匹配算法确定同名点,匹配速度高达500—1000点/秒,可处理航空影像、SPOT影像和近景影像,包括8bit黑白影像和24bit彩色影像。多种高效、实用的测图模式及与  相似文献