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   

多频测深初探   总被引：2，自引：0，他引：2  

苏发  何继善  温佩琳 《物探与化探》1994,18(2):131-135

在频率域测深的基础上,提出了多频测深方法,实现一机多频同时观测的目的,以提高观测速度。本文讨论了多频观测方法的理论依据及工作特点,并提示实现这种观测的方案。  相似文献   

Study　on　electric　variations　of　media　in　epicentral　area　by　geomagnetic　transfer　functions   总被引：1，自引：0，他引：1  

曾小苹  林云芳  朱忠杰  续春荣  赵明  张崇阳  刘绮亮 《地震学报(英文版)》1995,8(3):413-418

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Fhe application of electromagnetic-induction on the measurement of sea ice thickness in the Antarctic     

Guo Jingxue Sun Bo Tian Gang 《应用地球物理》2007,4(3):214-220

As an important component of the cryosphere, sea ice is very sensitive to climate change. The study of sea ice physics needs accurate sea ice thickness. This paper presents an electromagnetic induction （EM） technique which can be used to measure the sea ice thickness distribution efficiently and its successful application in the Antarctic Neila Fjord. Based on the electrical properties of sea ice and seawater and the application of electromagnetic field theory, this technique can accurately detect the distance between the EM instrument and the ice/water interface to measure the sea ice thickness. Analyzing the apparent conductivity data obtained by the electromagnetic induction technique and drill-hole measurements at same location allows the construction of a transform equation for the apparent conductivity and sea ice thickness. The verification of the calculated sea ice thickness using this equation indicates that the electromagnetic induction technique is able to determine reliable sea ice thickness with an average relative error of only 5.5%. The ice thickness profiles show the sea ice distribution in Neila Fjord is basically level with a thickness of 0.8 - 1.4 m.  相似文献   

Impact of Doppler Radar Wind in Simulating the Intensity and Propagation of Rainbands Associated with Mesoscale Convective Complexes Using MM5-3DVAR System     

S. Abhilash  Someshwar Das  S. R. Kalsi  M. Das Gupta  K. Mohankumar  John P. George  S. K. Banerjee  S. B. Thampi  D. Pradhan 《Pure and Applied Geophysics》2007,164(8-9):1491-1509

Pre-monsoon rainfall around Kolkata (northeastern part of India) is mostly of convective origin as 80% of the seasonal rainfall is produced by Mesoscale Convective Systems (MCS). Accurate prediction of the intensity and structure of these convective cloud clusters becomes challenging, mostly because the convective clouds within these clusters are short lived and the inaccuracy in the models initial state to represent the mesoscale details of the true atmospheric state. Besides the role in observing the internal structure of the precipitating systems, Doppler Weather Radar (DWR) provides an important data source for mesoscale and microscale weather analysis and forecasting. An attempt has been made to initialize the storm-scale numerical model using retrieved wind fields from single Doppler radar. In the present study, Doppler wind velocities from the Kolkata Doppler weather radar are assimilated into a mesoscale model, MM5 model using the three-dimensional variational data assimilation (3DVAR) system for the prediction of intense convective events that occurred during 0600 UTC on 5 May and 0000 UTC on 7 May, 2005. In order to evaluate the impact of the DWR wind data in simulating these severe storms, three experiments were carried out. The results show that assimilation of Doppler radar wind data has a positive impact on the prediction of intensity, organization and propagation of rain bands associated with these mesoscale convective systems. The assimilation system has to be modified further to incorporate the radar reflectivity data so that simulation of the microphysical and thermodynamic structure of these convective storms can be improved.  相似文献   

电磁感应技术在南极海冰厚度探测中的研究与应用   总被引：1，自引：0，他引：1  

郭井学  孙波  田钢 《应用地球物理》2007,4(3)

  相似文献   

以热量平衡为基础的体感温度模型及气候要素的效应分析   总被引：9，自引：2，他引：9  

刘梅  于波  姚克敏 《南京气象学院学报》2001,24(4):527-535

通过对丰季人体热量平衡方程的建立与计算，结合我国不同年龄段人群的新陈谢特点，分别建立了不同的体感温度模型，经与我国目前应用较为广泛的人体舒适度统计模型的计算结果相比较，证明以热量平衡为基础的人体感温度模型更具有普遍性。还分析了风，湿度，辐射对体感温度的影响效应。这些结果将为拓宽舒适度服务范围，建立以人体舒适度为核心的城市气象服务体系提供理论依据。  相似文献   

Anisotropy of the apparent resistivity variation rate near the epicentral region for strong earthquakes   总被引：1，自引：0，他引：1  

杜学彬  阮爱国  范世宏  郝臻 《地震学报(英文版)》2001,14(3):303-314

IntroductionThe geo-electrical anisotropy before earthquake is of special significance for the prediction of earthquake location and for the research on crustal stress status near the epicentral region. The anisotropy has been studied from various aspects (CHEN, et al, 1983; QIAN, et al, 1985, 1996; LU, et al, 1990a; MAO, et al, 1995; RUAN, et al, 1999). But the anisotropic phenomena presented by geo-electrical data are not practically satisfactory and not clear as compared with the res…  相似文献   

Evolution of Pangea: paleomagnetic constraints from the Southern Alps, Italy     

Giovanni Muttoni  Dennis V. Kent  James E.T. Channell 《Earth and Planetary Science Letters》1996,140(1-4):97-112

A new early Late Triassic paleopole for Adria has been obtained from the Val Sabbia Sandstone in the Southern Alps. As Early Permian and Jurassic-Cretaceous paleomagnetic data from para-autochthonous regions of Adria such as the Southern Alps are consistent with ‘African’ APWPs[1–2], paleomagnetic data from this region can be used to bolster the West Gondwana APWP in the poorly known Late Permian-Triassic time interval. The Southern Alpine paleopoles are integrated with the West Gondwana and Laurussia APWPs of Van der Voo [1] and used to generate a tectonic model for the evolution of Pangea. The Early Permian overall mean paleopole for West Gondwana and Adria, in conjunction with the coeval Laurussia paleopole, support Pangea B of Morel and Irving [3]. The Late Permian/Early Triassic and the Middle/Late Triassic paleopoles from Adria and Laurussia support Pangea A-2 of Van der Voo and French [4]. The phase of transcurrent motion between Laurasia and Gondwana[5] that caused the Pangea B to A-2 transition occurred essentially in the Permian (at the end of Variscan orogeny) with an average relative velocity of approximately 10 cm/yr. Finally, the Late Triassic/Early Jurassic paleopoles from West Gondwana and Laurussia agree with Pangea A-1 of Bullard et al. [6], the widely accepted Pangea configuration at the time of the Jurassic breakup.  相似文献   

石膏热学性质的实验研究   总被引：2，自引：0，他引：2  

袁曦明  贾晓静 《矿物岩石》1995,15(2):26-30

用差示扫描１热仪测定石膏（ＣａＳＯ＿４·２Ｈ２Ｏ）的脱水活化能；用红外光谱仪研究掺入微量Ｅｕ￣（３＋），Ｍｎ￣（２＋），Ｐｂ￣（２＋）后，在不同温度煅烧下产物的红外光谱图，并测定其热发光性质；对石膏以及掺杂后的热学性质进行了讨论。  相似文献