Adjustment of the electromagnetic field distorted by 3-D heterogeneities     

M. Menvielle  P. Tarits 《Geophysical Journal International》1994,116(3):562-570

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Existence of an Optimal Conductivity and Fréchet Differentiability In 2-D Electromagnetic Inversion     

M. E. Everett 《Geophysical Journal International》1994,117(1):111-119

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Asymptotic Theory For Diffusive Electromagnetic Imaging     

Jean Virieux  Carlos Flores-Luna  Dominique Gibert 《Geophysical Journal International》1994,119(3):857-868

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瞬变电磁法在工程地质勘察中的应用   总被引：1，自引：0，他引：1  

戴定璇  丁进  马昌今  陈道海 《物探与化探》1995,19(5):385-390

用瞬变电磁法在黄石市某矿主竖井建设地段查明了地表到地下100m的岩洞、构造破碎带、断裂带,并利用这些资料讨论了洞的成因及其与断裂破碎带的关系.圆满地完成了矿方提出的地质任务.  相似文献   

电偶源瞬变电磁测深一维全区视电阻率解释方法研究   总被引：4，自引：0，他引：4  

黄力军 《物探与化探》1995,19(5):391-397

本文从理论计算和野外实测资料处理两方面讨论了电偶源瞬变电磁测深─维全区视电阻率解释方法以及与之相关的实测数据预处理、磁场计算及─维磁场数值反演方法.  相似文献   

水平载流线圈中心点组合波频域电磁测深视电阻率定义     

苏发  何继善 《物探与化探》1995,19(5):379-384

由于近区场的复杂性及目前频域电磁测深方法的局限性,近区频域电磁测深多年来一直是地球物理领域一个悬而未决的问题.本文在近区场理论的基础上,通过引人组合波理论,提出了一种能适于近区频域电磁测深的视电阻率的定义式.该视电阻率在近区具有有效压制背景场、突出地电异常信息的功能,并能客观地反映地电断面的电性变化规律.  相似文献   

Modelling the effects of motion on primary production in the mixed layer of lakes     

John C. Patterson 《Aquatic Sciences - Research Across Boundaries》1991,53(2-3):218-238

A model of the time dependent relationship between productivity and light intensity following changes in light intensity is briefly described. The model incorporates two response timescales simulating initial response and photoinhibition, although additional timescales could easily be incorporated. The model is calibrated against one set of time dependent data, and applied to two simple models of motion in the upper mixed layer of a lake. The two models are: organised motion simulating Langmuir cells, and disorganised motion simulating the turbulent velocity field associated with surface wind stirring. The depth and therefore light histories for a number of photosynthesising particles are calculated by these models, and used by the productivity model to calculate mean productivities. The results show that the influence of the time dependent nature of the productivity relationship depends on the ratio of the mixed layer depth to the euphotic depth, and to a less extent, on the rate at which the particles circulate in the mixed layer.  相似文献   

磁偶源频率测深视电阻率曲线的正演计算     

郝志刚  朴化荣 《吉林大学学报(地球科学版)》1991,(1)

磁偶源频率测深法是一种有效的地球物理勘探方法。多年来,人们对这种方法的正演理论和反演解释进行了研究。文中利用快速汉克尔数值滤波算法计算了层状介质上直立磁偶极子的电磁场响应以及频率测深视电阻率的振幅响应,这种计算方法与常用的数值积分算法相比,具有计算速度快、精度高等特点。同时详细地讨论了磁偶源频率测深的特点及视电阻率理论曲线的特征。  相似文献   

水平电偶源频率测深中全区视电阻率定义的新方法   总被引：12，自引：2，他引：12       下载免费PDF全文

汤井田  何继善 《地球物理学报》1994,37(4):543-552

从电磁场的统一性出发，分析了水平电偶源频率测深中等效电阻率的算法原理和具体定义．分析表明，等效电阻率可明显地改善波区视电阻率在非波区场的畸变，较为形象、直观地反映出地电断面的电性变化．数值计算、三维模型计算和实际数据处理表明，等效电阻率具有良好的特性和应用前景．  相似文献   

Transient loading-related settlement of a square foundation on geogrid-reinforced sand     

B. M. Das  A. Maji 《Geotechnical and Geological Engineering》1994,12(4):241-251

Summary Laboratory model test results are presented that determine the effectiveness of using layers of geogrids as reinforcement in sand to reduce the settlement of square surface foundations subjected to transient loading. The model tests were conducted with only one type of geogrid at one relative density of compaction of sand. The maximum intensity of the transient load applied always exceeded the static ultimate bearing capacity of the foundation when supported by unreinforced sand. The settlement reduction factors for various depths of reinforcement have been determined.  相似文献