Frequency Effects of Fine Thin Layer

ＦｒｅｑｕｅｎｃｙＥｆｆｅｃｔｓｏｆＦｉｎｅＴｈｉｎＬａｙｅｒ￥ＺｈａｎｇＳｈｕａｎｇｘｉ（ＥｅｐａｒｔｍｅｎｔｏｆＧｅｏｐｈｙｓｉｃｓ，ＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆＧｅｏｓｃｉｅｎｃｅｓ，Ｗｕｈａｎ４３００７４）ＹｕａｎＴａｏ；ＺｈａｎｇＷｅ...     

TROPICAL ATMOSPHERIC NONLINEAR STEADY RESPONSE SOLUTION UNDER EFFECTS OF PAIRED HEAT SOURCES OF CONTRASTING NATURE*

Based on steady semi-geostrophic model equations,analysis is carried out of the linear and nonlinear modification/response of the tropical atmosphere to the forcing of ideal paired heat sources of contrasting nature.Resuits show that the linear part is dominant in the steady response but the nonlinear modification is quite noticable in the neighborhood of the heat source and between the paired sources,and the barotropic mode and second baroclinic mode play a different role in the modification,with the barotropic(second baroclinic)mode modification depending largely on the Rossby wave self-interaction(the magnitude due to the Kelvin-Rossby wave interaction)between the paired sources.     

Transient electromagnetic response due to a pair of horizontal conducting sheets in a loop field

The transient electromagnetic response due to a pair of horizontal conducting sheets induced by a loop field is obtained. The response characteristics in the three different regions (above the upper sheet, between the two sheets and below the lower sheet) are briefly discussed. In the first and second regions the composite response is characterised by an overburden response asymptote during early times and a target response asymptote during late times. The transition zones are characterised by shoulder-like bends. In the third region, the composite response increases in direct proportion to the induction number, eventually merging with the target response for large values of the induction number.     

加卸载响应比理论在中强地震（7〉M≥6）预测中的应用

本文运用加卸载响应比理论对中强地震前的加卸载响应比的变化进行了研究。结果表明，中强地震前加卸载响应比明显上升，表现为三种不同的形态，持续时间为半年到两年。     

疏勒河断裂中段VLF响应特点及地质解释

疏勒河断裂带中段为一隐伏基底断裂。由于规模较大，并且充填了低阻的构造角砾岩，因此对ＶＬＦ有很好的响应。本文分析了该构造的ＶＬＦ响应特点，指出在本区用ＶＬＦ方法寻找隐伏构造的有效性和局限性。     

端承桩基础轴向地震反应分析

本文对分层弹性地基中端承桩基础通过特性分析建立了合理的力学模型，通过动力分析，给出了端承桩基础轴向自振特性及在竖向地震载荷作用下强迫反应的解析解。文中的解析公式为分层弹性地基中的端承桩基础轴向动力反应分析提供了一种新的解析方法。     

珠江三角洲通信系统震害预测

基于珠江三角洲通信建筑物的调查资料，对典型的通信建筑物做了时程地震反应分析和单体震害预测；对另一些建筑物做了群体震害预测；并就通信设备震害预测问题做了简单评述。     

Field of vertical crustal deformation in North China and the feature of its dynamic evolution

ＦｉｅｌｄｏｆｖｅｒｔｉｃａｌｃｒｕｓｔａｌｄｅｆｏｒｍａｔｉｏｎｉｎＮｏｒｔｈＣｈｉｎａａｎｄｔｈｅｆｅａｔｕｒｅｏｆｉｔｓｄｙｎａｍｉｃｅｖｏｌｕｔｉｏｎ王若柏，洪汉净，许忠淮，耿世昌，孙东平，韩月萍Ｒｕｏ－ＢａｉＷＡＮＧ；Ｈａｎ－ＪｉｎｇＨＯＮ...     

A new theoretical solution of the effect of atmospheric pressure on water level

Based on the partial differential equation governing the effect of atmospheric pressure on water level of confined well, deriving the boundary condition and considering the seepage water between well and aquifer, the author obtained the analytical solution of water level change in time domain under the action of an atmospheric pressure history with the Laplace transform method. This solution is composed of two terms:stable and retarded terms. The stable term is the multiplication of barometric efficiency and simultaneous atmospheric pressure, and it implies the value of water level after infinite time when the atmospheric pressure is a constant from the time in question. The retarded term is the transient process due to the time lag of water exchange between well and aquifer. From the solution, it is obtained that the interference of atmospheric pressure on water level is the integral superimposition of the contribution of all atmospheric pressure changes before the time in question. So that, we further found out the response function of pulsive atmospheric pressure history. Calculation shows: (1) The pulsive response function starts from zero and tends to a steady value, which is proportional to the barometric efficiency, when the time tends to infinity; (2) The retarded time depends on the mechanical property of aquifer and the radius of well. The larger the seepage coefficient, the smaller the radius of well and the thicker the aquifer, then the shorter the retarded time gets. This solution can be used as the theoretical basis for further analysis of the atmospheric effect and practical correcting method in the future.     

The effects of torsional ground motion on thin cylindric shell structures

Ｔｈｅｅｆｆｅｃｔｓｏｆｔｏｒｓｉｏｎａｌｇｒｏｕｎｄｍｏｔｉｏｎｏｎｔｈｉｎｃｙｌｉｎｄｒｉｃｓｈｅｌｌｓｔｒｕｃｔｕｒｅｓ王君杰Ｊｕｎ－ＪｉｅＷＡＮＧ（ＩｎｓｔｉｔｕｔｅｏｆＥｎｇｉｎｅｅｒｉｎｇＭｅｃｈａｎｉｃｓ，ＳｔａｔｅＳｅｉｓｍｏｌｏｇｉ...