Preliminary results of seismic hazard assessment in the Sannio-Matese area of Southern Italy

The seismic hazard in the Sannio-Matese area has been worked out by a modification of the McGuire (1976) computing programme, taking into account the influence of nine potential seismic source zones.The method uses truncated-quadratic intensity-frequency distribution and azimuth-dependent intensity attenuation derived from isoseismal maps for each of the seismogenetic sources. A new modification has been introduced to take into account different decay of the intensity in the near (to VIII degree) and far (from VIII degree) field.Different assumptions about maximum possible intensities and truncation of intensity-frequency laws are used to evaluate the effects of the uncertainties on the computed hazard at high intensities. Intensities associated with different level of annual probability are computed for five test sites in the considered area. Maps displaying the expected intensity for a mean return period of 500 years (pa 0.002) are presented and compared with observed intensities.Presented at the XXIst General Assembly of the European Seismological Commission, Symposium on Methods of Seismic Hazard Assessment in Europe, Sofia, 23–27 August 1988.     

Centralized power and divided space: `Fractured regions' in the Israeli `ethnocracy'

This paper uses a critical political-geographical perspective to account for the high centrality of power found in Israel. It suggests that the concentration of power have not been solely caused by national solidarity and integration or by metropolitan development, as commonly explained, but also by the territorial `fracturing' of the main social and ethnic groups in Israel/Palestine. This has prevented the emergence of effective pressure for regional devolution. Israel's character as a settler and settling state, and its central project of Judaizing contested territories, enabled the Israeli `ethnocracy' and its (mainly Ashkenazi and secular) elites to create a political geography of `fractured ethnic and social regions'. Dispersing minorities and legitimizing segregation and inequality, all in the name of the `national interest', achieved this. The Israeli political landscape is therefore organized as `fractured regions', each representing a distinct and interconnected, yet geographically dispersed, set of localities, and resembling a `chain of beads'. The logic of dispersal and segregation, in turn, has also influenced patterns of development and residential separation within Israel's main urban areas. Thus, ethnic and social fragmentation and conflict, and not a putative process of national or metropolitan integration, can explain much of Israel's highly centralized power structure.     

定向钻进敷设电缆保护管轨迹优化设计研究

在老旧城区内采用定向钻进敷设地下管线,常常需要从已有的各类地下建（构）筑物或管线下方穿过,方案设计时就应考虑新建管道与之安全距离的取值问题。以厦门市某110 kV电力电缆的定向钻进工程的实际需求为出发点,在对国内现有规程规范及工程实例调查的基础上,对电力电缆保护管定向钻进敷设安全距离取值的影响因素进行分析,优化工程定向钻进敷设方案,指导该工程的建设,并为类似工程建设提供参考。     

双层地基水平受荷桩受力变形分析

基于双层地基中的水平受荷桩的特性,对其受力变形进行了分析。将水平受荷桩视为竖直放置的弹性地基梁,基于Winkler弹性地基梁理论,考虑桩土共同工作得到水平受荷桩位移控制微分方程及其幂级数解答,进而根据内力与位移的连续条件得到了由桩顶受力及变形条件表示任一深度处桩身的水平位移、转角、弯矩及剪力的计算矩阵表达式。通过一具体算例将幂级数解计算结果与《公路桥涵地基与基础设计规范》推荐的简化计算公式计算结果进行了比较。结果表明：当第1层地基土的厚度在某一定值时,《规范》简化计算方法所得结果与幂级数解接近;但当层厚不在该值附近时,两个方法计算结果存在差异。     

豫西地区铝土矿中镓的分布规律研究

镓是一种价格昂贵的稀散金属，其应用前景十分广阔。豫西地区的铝土矿石中含有丰富的镓资源。通过对区内铝土矿石中镓的分布特征做了多方面的对比研究，归纳出镓的分布规律：空间上，在不同铝土矿区的矿石中镓的平均质量分数变化显著，在矿体平均厚度最大的张窑院矿区，矿石中的镓高度富集。时间上，沉积成矿相对较早的铝土矿层，因其长期遭受强烈的表生富集作用，矿石中镓的平均品位较高。从矿石结构类型来看，土状和峰窝状矿石中的镓品位明显高于短、鲕状和致密状矿石。另外，矿石中镓平均含量的变化总与铝土矿富矿体的产出位置关系密切。并且，探讨了铝土矿中镓分布规律的控制因素。     

高密度电法在电力工程勘测中的应用

该文通过工程实例，分析了高密度电法在电力工程勘测中的应用前景、应用效果及发展方向。     

A wavelet method for detecting S‐waves in seismic data

Seismic signals consist of several typically short energy bursts, called phases, exhibiting several patterns in terms of dominant frequency, amplitude and polarisation. We present a fast algorithm to detect the so‐called S‐phase in a three‐component seismic signal. This new approach combines traditional S‐phase detection methods and the discrete wavelet transform. This revised version was published online in July 2006 with corrections to the Cover Date.     

大功率激电在双阳煤田找矿应用

大功率激电法在双阳煤田找煤的应用中,证实了山河推覆构造的存在;在充分研究工作区的地质、地球物理特征前提下,恰当地选用了方法技术,并正确理解异常的地质、地球物理意义,取得了较好的找煤效果,在Ⅰ号剖面的激电异常上经钻探和坑探证实磨盘山组灰岩下存在质量较好的可采煤层。     

某抽水蓄能电站输水系统下平段区围岩渗透薄弱部位探测

对于地下工程围岩渗透薄弱部位的探测是一项具有隐蔽性和复杂性的地质工程。为避免或减少采用单一探测方法可能出现的不确定性,以一抽水蓄能电站为例,并行采用了4种方法对研究区进行了探测：（1）放射性法;（2）高密度电法;（3）天然示踪法;（4）水质分析法。就其原理而言,前2种方法属于应用地球物理范畴,而后2种方法则属于应用地球化学范畴。根据探测成果,认为区内岩体渗透薄弱部位是存在的,而以 射线强度负异常、低电阻、渗漏水点水温及其他水质指标含量比较接近其补给源作为标志。就其形成机制而言,为多场耦合作用的产物;其中,水动力作用、水化学作用及其耦合作用为最活跃的因素。