供电网络系统的可靠性分析

研究了生命线工程系统中供电网络系统的可靠性分析方法。在元件可靠性分析的基础上,进行供电网络系统工程地震可靠性分析,提出了供电网络系统功能失效分级及失效等级的判定方法,并建立了功能失效系数的概念,给出了供电网络系统功能失效系数的计算方法,从而实现了供电网络系统功能失效分析的定量化。     

国家地震紧急救援训练基地废墟训练场训练功能设计

本文简要介绍了国家地震紧急救援训练基地废墟训练场废墟构筑物A的背景和工程概况,主要从搜索功能训练和救援功能训练两个方面对废墟进行了功能设计：针对废墟构筑物A在训练功能实现过程中存在的问题进行了讨论,并提出了解决方法,为废墟A能更好的满足训练功能的要求提出了建议。     

远程故障诊断监控系统中心软件的设计与应用

介绍了远程故障诊断监控系统中心软件的组成及功能,详细阐述了该软件功能的实现方法。     

功能梯度复合材料圆柱壳固有频率解

本文建立了功能梯度复合材料圆柱壳的基本动力方程，给出了各类功能梯度复合材料圆柱壳固有频率的一般解析解法，并具体导出了两端简支功能梯度圆柱壳各阶固有频率解的解析表达式，十分简明、实用。     

西安阎良供水系统地震功能失效状态分析

采用供水系统震害预测及功能失效状态分析方法,对西安市阎良区供水系统在不同强度的地震作用下的震害情况和功能失效状态进行了分析,并大致估计了系统功能恢复到震前状态所需要的时间。     

LDAWYZ-Ⅰ型压力水位仪网站设计与实现

对LDAWYZ-1型压力水位仪的网站设计与制作以及功能的实现进行介绍,详细阐述了实时监测功能以及数据下载功能的设计思路以及实现过程。     

LDAWYZ-I型压力水位仪网站设计与实现

对LDAWYZ-1型压力水位仪的网站设计与制作以及功能的实现进行介绍,详细阐述了实时监测功能以及数据下载功能的设计思路以及实现过程.     

流域因素与人类活动对黄河下游河道输沙功能的影响

从泥沙收支平衡的概念出发定义了河道的输沙功能, 提出了河道输沙功能的定量指标, 研究了流域自然因子和人类活动对黄河下游河道输沙功能的影响. 这种影响可以用不同水沙来源区的降水量、进入黄河下游的大于0.05 mm粗泥沙占来沙量百分比、黄河上游水库对汛期清水基流的调节程度(以兰州站汛期径流量占全年百分比表示)、高含沙水流频率、流域内水土保持措施实施面积等来定量表达. 运用多元回归分析方法, 建立了黄河下游河道输沙功能指标与上述7个因子之间的多元回归方程. 表明不同水沙来源区降水量的减少对下游河道输沙功能的影响是不同的. 河口镇以上清水区和龙门至三门峡之间年降水量减少, 将导致下游河道输沙功能指标降低; 河口镇至龙门间降水减少, 将导致下游河道输沙功能指标增高. 来沙的组成强烈地影响下游河道输沙功能指标, 进入黄河下游的大于0.05 mm粗泥沙占来沙量百分比越大, 则河道输沙功能指标越低. 因此, 小浪底水库拦截粗泥沙、排出细泥沙, 将有利于提高下游河道输沙功能指标. 兰州站汛期径流量占全年百分比越低, 下游河道输沙功能指标越低, 说明黄河上游水库大量拦截汛期清水基流, 是下游河道输沙功能降低的原因之一.     

国家地震速报灾备中心技术系统介绍

灾备中心作为我国地震速报业务功能备份中心,主要承担我国地震速报业务的功能备份和全国测震数据实时转发服务。本文介绍了国家地震速报灾备中心平台的技术构成、业务数据库系统、承载业务功能及流程等情况,对平台的技术特点和功能特性进行总结,通过对平台应用成效的初步统计分析,提出了平台的下一步完善计划。     

基于GIS的城市建筑物震害预测信息系统设计与开发

城市建筑物震害预测信息系统是基于GIS平台开发的信息系统.文中主要讨论了系统的结构设计、数据库设计、系统基本的图形显示和图形编辑等GIS功能, 以及地震危险性分析功能、地震结构易损性分析功能、建筑物震害损失分析功能等专业功能及实现.此系统能够为城市防震减灾工作的开展提供科学依据,能够满足防震减灾工作的需要.     

渤海常见土类剪切波速与埋深关系分析

土层的剪切波速是岩土地震工程中重要的物理量,本文利用多年来在渤海海域地震安全性评价中积累的资料,研究了渤海常见土类剪切波速和埋深的关系。利用非线性最小二乘法,采用指数函数、一次函数、二次函数、幂函数、"幂函数+常数函数"、"幂函数+一次函数" 6种回归模型对各类土的剪切波速和埋深的关系进行了回归分析,以拟合优度以及最小二乘拟合的误差平方和为评价指标对比了各种模型拟合效果的优劣。结果表明,"幂函数+一次函数"回归模型的拟合效果最好。此外,本文给出了该海域常见的7类土在此回归模型下的拟合公式的系数,以供工程中参考。     

Mapping crustal S—wave velocity structure with SV—component receiver function method

In this article,we analyze the characters of SV-component receiver function of teleseismic body waves and its advantages in mapping the S-wave velocity structure of crust in detail.Similar to radial receiver function,SV-component receiver function can be obtained by directly deconvolving the P-component from the SV-component of teleseismic recordings.Our analyses indicate that the change of amplitude of SV-component receiver function against the change of epicentral distance is less than that of radial receiver function.Moreover,the waveform of SV-component receiver function is simpler than the radial receiver function and gives prominence to the PS converted phases that are the most sensitive to the shear wave velocity structure in the inversion.The synthetic tests show that the convergence of SV-component receiver function inversion is faster than tnat of the radial receiver function inversion.As an example,we investigate the S-wave velocity structure beneath HIA sta-tion by using the SV-component receiver function inversion method.     

利用SV分量接收函数反演地壳横波速度结构

详细讨论了远震体波SV分量接收函数的特点及其在反演地壳S波速度结构中的优势．与径向接收函数类似，SV分量接收函数可通过对远震体波的SV分量直接反褶积P分量获得．研究分析表明:与径向接收函数相比，SV分量接收函数的振幅随震中距的变化更加稳定，波形简单且突出了对结构最敏感的PS转换波信息．理论数值实验显示:在反演地壳S波速度结构时，SV分量接收函数比径向接收函数具有更好的收敛性．作为实例，利用SV分量接收函数反演方法反演了海拉尔台下的S波速度结构．      

A FAST METHOD FOR DETERMINING THE LAYER DISTRIBUTION FROM THE RAISED KERNEL FUNCTION IN GEOELEGTRICAL SOUNDING*

In a previous publication (Koefoed 1968) a function called the “raised kernel function” has been introduced as an intermediate function in the interpretation of resistivity sounding data, and methods have been described both for the determination of the raised kernel function from the apparent resistivity function, and for the determination of the layer distribution from the raised kernel function. In the present paper a procedure is described by which the second step in this interpretation method–i.e. the determination of the layer distribution from the raised kernel function–is considerably accelerated. This gain in interpretation speed is attained by the use of a standard graph for a function which defines the reduction of the raised kernel function to a lower boundary plane.     

CT断层重建中滤波函数设计的新方法

滤波函数在CT图像重建过程中起着非常重要的作用,直接关系到重建图像质量。为了提高CT重建图像质量,本文从加权平均的思想出发,根据FBP重建算法的理论基础,提出一种设计滤波函数的新思路,并分析了五点加权平均滤波函数性能比较。最后针对Shepp-Logan模型数据和实际的海螺投影数据,设计出一种新的滤波函数并与S-L和R-L滤波函数的重建效果进行了比较。从比较结果可以看出,新设计的滤波函数重建的图像效果在整体性能上最好,在局部地方,其密度分辨率有所提高。本文为滤波函数的设计提出了一种新的想法和思路。     

磁通门磁变仪状态函数对电磁转换函数测定值的影响

分析了磁通门磁变仪定向状态函数对电磁转换函数测定位的影响，指出在利用转换函数分析预报地震时，定向状态函数的影响不容忽视。     

2D Laplace-Domain Waveform Inversion of Field Data Using a Power Objective Function

The wavefield in the Laplace domain has a very small amplitude except only near the source point. In order to deal with this characteristic, the logarithmic objective function has been used in many Laplace domain inversion studies. The Laplace-domain waveform inversion using the logarithmic objective function has fewer local minima than the time- or frequency domain inversion. Recently, the power objective function was suggested as an alternative to the logarithmic objective function in the Laplace domain. Since amplitudes of wavefields are very small generally, a power <1 amplifies the wavefields especially at large offset. Therefore, the power objective function can enhance the Laplace-domain inversion results. In previous studies about synthetic datasets, it is confirmed that the inversion using a power objective function shows a similar result when compared with the inversion using a logarithmic objective function. In this paper, we apply an inversion algorithm using a power objective function to field datasets. We perform the waveform inversion using the power objective function and compare the result obtained by the logarithmic objective function. The Gulf of Mexico dataset is used for the comparison. When we use a power objective function in the inversion algorithm, it is important to choose the appropriate exponent. By testing the various exponents, we can select the range of the exponent from 5 × 10^?3 to 5 × 10^?8 in the Gulf of Mexico dataset. The results obtained from the power objective function with appropriate exponent are very similar to the results of the logarithmic objective function. Even though we do not get better results than the conventional method, we can confirm the possibility of applying the power objective function for field data. In addition, the power objective function shows good results in spite of little difference in the amplitude of the wavefield. Based on these results, we can expect that the power objective function will produce good results from the data with a small amplitude difference. Also, it can partially be utilized at the sections where the amplitude difference is very small.     

INTERPRÉTATION DIRECTE DES COURBES DE SONDAGE ÉLECTRIQUE ET LE PROBLÈME DE DIFFÉRENTS DISPOSITIFS DE MESURE *

Direct interpretation methods of resistivity curves are discussed, which use the kernel function of the apparent resistivity. This function results from the consideration of the problem of diverse electrodes configurations. Several expressions for the determination of the kernel function of the potential from the kernel function of the apparent resistivity are given.     

矩形和钟形震源时间函数对地震动模拟结果的影响比较

首先介绍了用于地震动数值模拟的国际通用软件COMPSYN程序,并对此进行了二次开发,将其震源时间函数由矩形函数改为钟形函数,通过与全空间的解析解计算结果的对比,验证了修改后程序的正确性。通过对比2种震源时间函数的频谱特点,指出矩形函数的高频成分丰富,不利于地震动的模拟。2种震源时间函数下用COMPSYN程序对同一观测点地震动模拟的结果表明,矩形函数模拟的时程出现＂振铃＂和＂锯齿＂现象,且随截止频率的增加而加重,影响了对模拟地震图的识别,而钟形函数模拟的时程较为平滑,说明采用钟形函数进行地震动数值模拟是比较合理的。     

Electron velocity distribution function in a plasma with temperature gradient and in the presence of suprathermal electrons: application to incoherent-scatter plasma lines

The plasma dispersion function and the reduced velocity distribution function are calculated numerically for any arbitrary velocity distribution function with cylindrical symmetry along the magnetic field. The electron velocity distribution is separated into two distributions representing the distribution of the ambient electrons and the suprathermal electrons. The velocity distribution function of the ambient electrons is modelled by a near-Maxwellian distribution function in presence of a temperature gradient and a potential electric field. The velocity distribution function of the suprathermal electrons is derived from a numerical model of the angular energy flux spectrum obtained by solving the transport equation of electrons. The numerical method used to calculate the plasma dispersion function and the reduced velocity distribution is described. The numerical code is used with simulated data to evaluate the Doppler frequency asymmetry between the up- and downshifted plasma lines of the incoherent-scatter plasma lines at different wave vectors. It is shown that the observed Doppler asymmetry is more dependent on deviation from the Maxwellian through the thermal part for high-frequency radars, while for low-frequency radars the Doppler asymmetry depends more on the presence of a suprathermal population. It is also seen that the full evaluation of the plasma dispersion function gives larger Doppler asymmetry than the heat flow approximation for Langmuir waves with phase velocity about three to six times the mean thermal velocity. For such waves the moment expansion of the dispersion function is not fully valid and the full calculation of the dispersion function is needed.