地震台站数据文件传输智能管理

针对FTP方式报送数据及下载文件的方法,研制开发了数据文件传输软件,可自动搜索指定日期应传输的所有文件,自动检索并下载通知及地震目录等,实现了数据文件传输的智能化管理,确保数据传输完整、准确、及时。     

南水北调中线工程征地测量数据处理系统设计

针对南水北调中线工程征地测量内外业效率的不匹配状况,本文提出征地测量数据处理系统设计思路,给出了地块面积计算原理及主程序模块,结合工程实例对系统具有的地块自动分离、分类汇总、自由分割、边长方位量测、报表和宗地图输出等功能进行了介绍。     

武当山隧道进口处滑坡稳定性分析与研究

对武当山隧道进口处Ⅰ号和Ⅱ号滑坡稳定性主要影响因素进行了分析,采用传递系数法对Ⅰ号和Ⅱ号滑坡在天然及饱和状态下的稳定性进行定量计算,利用Flac3d软件对Ⅰ号滑坡在天然及饱和状态时的应力应变进行数值模拟研究.综合分析认为,降雨入渗是加剧武当山隧道进口处滑坡活动触发因素.为保证襄渝铁路运营安全,建议对Ⅰ号滑坡进行削坡处理,对Ⅱ号滑坡在前缘设置抗滑桩进行处理.     

基于DTU的加速度强振动记录终端的设计

设计基于DTU的强振记录终端,采用SOC系列C8051F015型单片机对MEMS加速度计的输出信号进行A/D转换,监测待测体所经受的强振加速度值,并通过DTU内嵌的GPRS无线网络通讯方式将数据发送到远程数据中心.该系统具有体积小,安装与操作方便,免维护等特性.     

ICEARRAY: the first small-aperture, strong-motion array in Iceland

A small-aperture, strong-motion array, the ICEARRAY, has been deployed in South Iceland, a region with a history of destructive earthquakes, some exceeding magnitude 7. The array’s purpose is: (1) monitoring future significant events in the region, (2) quantifying spatial variability of strong-motion over short distances and (3) shedding light on earthquake source processes. The number of array stations and their arrangement were based on an optimisation of the shape of the corresponding array transfer function (ATF). The optimal ICEARRAY configuration comprises 14 stations, has an aperture of ~1.9 km and a minimum interelement distance of ~50 m and possesses a near-azimuthally independent ATF with a sharp main lobe, negligible sidelobes and a wavenumber range of 1.5–24 rad/km. Accordingly, the ICEARRAY has the intended capabilities of capturing seismic waves in the frequency range of 1–20 Hz, which is of main interest to earthquake engineering and engineering seismology applications.     

地磁转换函数方法之典型震例及数模对比

转换函数零线等值图在2003年新疆伽师-巴楚M_L7.0地震前密集交汇, 震后开始发散, 进一步证实了地磁转换函数方法对预测地震的有效性。 同时, 为适应全国地磁台站的记录数据由模拟向数字化的转变, 对模拟数据和数字化数据从时间序列和转换函数计算结果两方面进行了对比, 为下一步使用数字化数据计算转换函数进行地震预测研究打下了基础。     

A wavelet for predicting the time-domain response of vertically tethered systems

The response wavelets for tether tension and the displacement of a package on the end of a tether are derived from a linear, frequency-domain model of vertically tethered systems using inverse fourier transform techniques. These wavelets are convolved with a record of ship displacement to predict the instantaneous tension and displacement to an accuracy of better than 20% for a typical system. Although snap loads are non-linear and the response cannot be calculated while the tether is slack, the onset of zero tension — a precursor to snap loads — is predicted by the wavelet. Thus, extreme and potentially hazardous conditions are foreseeable with the wavelet and this information can be used in real-time to guide operations at sea.     

二次规划在调水决策和水分配问题中的应用

首先用二次函数建立了企业用水量与其用水效益的关系,然后根据这种关系,利用拉格朗日乘数法来确定该地区最优化水资源分配方案,并得到了该地区总的用水量与用水效益的关系,最终建立了区域调水中各地区间的调水总量的分配模型。此时原问题转化为一个典型的二次规划问题,结合各个地区的用水效益情况,可实现对各地区、各行业分水。利用假设的理想数据对模型进行检验,取得了较好的结果。对南水北调的实际情况,根据北方6个缺水地区基本的水资源及工农业用水情况进行了实际数据模拟,提出了南水北调的简单分配方案。该模型不仅可以用于区域间调水的优化控制,而且还可应用到其他水资源分配与管理。     

Space charge generation in the atmosphere and the density of mechanical transfer current to the ground

The correlation of mechanical transfer current from the atmosphere to the ground with the process of space charge formation as a result of conductivity current divergence near ground is under discussion in this research. Experimental data of conductivity current and mechanical transfer current acquired at three observation points for different meteorological conditions are analyzed. In particular, the peculiarities of mechanical charge transfer to ground under different stratifications of the surface layer are under discussion.     

On a modal damping identification model for non-classically damped linear building structures subjected to earthquakes

A simple modal damping identification model developed by the present authors for classically damped linear building frames is extended here to the non-classically damped case. The modal damping values are obtained with the aid of the frequency domain modulus of the roof-to-basement transfer function and the resonant frequencies of the structure (peaks of the transfer function) as well as the modal participation factors and mode shapes of the undamped structure. The assumption is made that the modulus of the transfer function of the non-classically damped structure matches the one of the classically damped structure in a discrete manner, i.e., at the resonant frequencies of that function modulus. This proposed approximate identification method is applied to a number of plane building frames with and without pronounced non-classical damping under different with respect to their frequency content earthquakes and its limitations and range of applicability are assessed with respect to the accuracy of both the identified damping ratios and that of the seismic structural response obtained by classical mode superposition and use of those identified modal damping ratios.