一种简易快速的时域地震波衰减补偿算法

针对地震波的能量随着传播时间的增加而递减,提出了一种时间补偿方法。通过调试与传播时间有关的两个可调参数进行地震波振幅补偿。模型试验证实了该方法可以有效地补偿能量的损失,而且在地层中地震波振幅衰减与品质因子Q值有关时,其中的一个可调参数可以用另一个可调参数和Q值来表示。也就是说,本文方法同样是一种反Q滤波方法。     

公路隧道雷电防护研究

通过对太行山区隧道机电设备频遭雷击事件的调研,分析了雷击灾害频发的河北省邢和隧道的地理、气象环境,并对雷击现场进行多次测试研究,对隧道防直击雷和雷电电磁脉冲两方面采取以下5项防雷措施:①建筑物及室外电力设施的直击雷防护,②高压线路的雷电过电压防护,③低压配电及弱电设备的过电压防护,④屏蔽,⑤等电位连结。经过几年的实地验证,防雷措施初见成效。     

动力及环境集中监控系统应用中问题的分析及建议

介绍了通讯专网机房集中监控系统的整体情况,组网方式,重点讨论了动力及环境集中监控系统在使用过程中存在的一些问题,提出了改进建议,最后对监控系统的管理问题提出了看法.     

Comparison between real‐time dynamic substructuring and shake table testing techniques for nonlinear seismic applications

Results from real‐time dynamic substructuring (RTDS) tests are compared with results from shake table tests performed on a two‐storey steel building structure model. At each storey, the structural system consists of a cantilevered steel column resisting lateral loads in bending. In two tests, a slender diagonal tension‐only steel bracing member was added at the first floor to obtain an unsymmetrical system with highly variable stiffness. Only the first‐storey structural components were included in the RTDS test program and a Rosenbrock‐W linearly implicit integration scheme was adopted for the numerical solution. The tests were performed under seismic ground motions exhibiting various amplitude levels and frequency contents to develop first and second mode‐dominated responses as well as elastic and inelastic responses. A chirp signal was also used. Coherent results were obtained between the shake table and the RTDS testing techniques, indicating that RTDS testing methods can be used to successfully reproduce both the linear and nonlinear seismic responses of ductile structural steel seismic force resisting systems. The time delay introduced by actuator‐control systems was also studied and a novel adaptive compensation scheme is proposed. Copyright © 2010 John Wiley & Sons, Ltd.     

A new computational strategy for solving two‐phase flow in strongly heterogeneous poroelastic media of evolving scales

We develop a new computational methodology for solving two‐phase flow in highly heterogeneous porous media incorporating geomechanical coupling subject to uncertainty in the poromechanical parameters. Within the framework of a staggered‐in‐time coupling algorithm, the numerical method proposed herein relies on a Petrov–Galerkin postprocessing approach projected on the Raviart–Thomas space to compute the Darcy velocity of the mixture in conjunction with a locally conservative higher order finite volume discretization of the nonlinear transport equation for the saturation and an operator splitting procedure based on the difference in the time‐scales of transport and geomechanics to compute the effects of transient porosity upon saturation. Notable features of the numerical modeling proposed herein are the local conservation properties inherited by the discrete fluxes that are crucial to correctly capture the fingering patterns arising from the interaction between heterogeneity and nonlinear viscous coupling. Water flooding in a poroelastic formation subject to an overburden is simulated with the geology characterized by multiscale self‐similar permeability and Young modulus random fields with power‐law covariance structure. Statistical moments of the poromechanical unknowns are computed within the framework of a high‐resolution Monte Carlo method. Numerical results illustrate the necessity of adopting locally conservative schemes to obtain reliable predictions of secondary recovery and finger growth in strongly heterogeneous deformable reservoirs. Copyright © 2011 John Wiley & Sons, Ltd.     

雷达无损检测技术及其在钢混构（物）件质量检测中的应用效果

本文从检测之系统性，科学性，准确性说明了雷达技术用于工程质量检测方面具有较大优越性，在扼要阐明雷达波在混凝土介质中的传播规律与特征的基础上，详细分析了雷达技术在无损检测混凝土构（物）件质量的分辨率，以2个无损检测工程实例，说明了该项技术在无损检测混凝土构（物）件质量的有效性和实用性。     

Probabilistic critical excitation for MDOF elastic–plastic structures on compliant ground

Earthquake ground motions and their effects on structural responses are very uncertain even with the present knowledge. It is therefore desirable to develop a robust structural design method taking into account these uncertainties. Critical excitation approaches are promising and a new random critical excitation method is proposed for MDOF elastic–plastic shear‐building structures on compliant ground. The power (area of power spectral density (PSD) function) and the intensity (magnitude of PSD function) are fixed and the critical excitation is found under these restrictions. In contrast to linear elastic structures, transfer functions and simple expressions for response evaluation cannot be defined in elastic–plastic structures and difficulties arise in describing the peak responses except by laborious elastic–plastic time‐history response analysis. Statistical equivalent linearization is used to estimate the elastic–plastic stochastic peak responses approximately. The critical excitation responses are obtained for several examples and compared with those of the corresponding recorded earthquake ground motion. Copyright © 2001 John Wiley & Sons, Ltd.     

Mapping Globalisation

As a form of restructuring with new winners and losers, globalisation begets resistance, and these processes occur in particular places that have distinctive features. A map of globalisation may be drawn by showing the spaces of resistance, many of which are found at the local level, sometimes with transnational links involving formal or informal networks. To do so, one must first assess the variety of meanings that have been assigned to the concepts of globalisation and resistance. Noting shades of meaning from the natural sciences, medicine, history, philosophy, law, and feminist and other branches of social theory, this paper argues that different frames may be used in conjunction with one another to help explain Southeast Asia's diverse encounters with globalisation. The frames show that resistance is not merely a negation of the jarring effects of globalisation, but also a matter of imagining, in a non-utopian manner, something better. Remapping globalisation is a quest for an appropriate temporal and spatial scale of social organisation.     

方差分析法在定点核旋观测资料质量检验中的应用

本文以地磁场的空间相关性为物理依据，以测点间测值线性回归方程的显著程度，为测点测值的质量检验标准，采用方差分析和相关系数法，以月为时段，分别计算了省内１９９２年１至１０月，１０个地磁台站的Ｆ，ｒ，Ｓ检验结果。结果表明，两种方法的检验效果相似。而方差分析法，在分辨率和准确性方面，明显优于相关系数法。按计算时段，选取标准台的办法，利于克服单一标准台的不足和空间磁场差异性变化对测点测值质量评估的影响。