11~＃住宅楼沉降监测及其变形规律分析

建筑物沉降观测，是高层建筑变形测量重要项目之一。本文以实测１１＃住宅楼为例，介绍了其沉降监测的实施方法和观测成果的分析；并得出施工阶段沉降变化规律。其结果对验证地基与基础的可靠性，工程结构的设计方案具有一定的参考价值。     

A survey to determine levels of chlorinated pesticides and PCBs in mussels and seawater from the Mid-Black Sea Coast of Turkey

A mussel and seawater monitoring survey was conducted at six sampling points between Yalikoy (Ordu) and Sinop in 1999-2000 along the Mid-Black Sea Coast of Turkey in order to assess concentrations of organochlorine pesticides (OCs) and polychlorinated biphenyls (PCBs). Chlorinated pesticides and PCBs were measured in the mussel Mytilus Galloprovincialis and in seawater. In the mussel samples, the most common pollutants in terms of average concentration per g of wet weight (ww), were DDT (max. 1800 pg/gww, min. 240 pg/gww) and its metabolites DDD (max. 5400 pg/gww, min. 240 pg/gww) and DDE (max. 2800 pg/gww, min. 70 pg/gww). Also, dieldrin, heptachlor and HCB were notable contaminants in the mussel samples. PCBs were determined in none of the biota or seawater samples. The concentrations of the OCs and PCBs in mussels were higher in coastal areas receiving river discharges and close to the largest city of the region, Samsun (especially in sampling points in the harbour area). The well-known long persistence of DDTs and other chlorinated compounds was confirmed by residues of these pollutants measured in mussels. On the other hand, even though the usage of such kind of persistent compounds in Turkey was banned, there may still be illegal usage and it is not certain whether the application of these compounds did end in the region.     

精确提取非色散波的CT—谱估计方法

本文从非色散谱性质出发,针对声波全波列测井数据处理相似处理法的缺点及非色散谱与信号的CT关系,导出CT—谱估计方法。实验结果表明:采用CICB算法的CT—谱估计法提取横波波这精度高达99％。     

GIS在矿产资源开发状况遥感动态监测中的应用

为建立全国性的矿产资源开发状况数据库系统，以山西省晋城市和江西省崇义县矿产资源开发状况遥感动态监测成果为基础 ，通过GIS 强大的空间数据管理功能，对所收集的数据进行管理，建立了具有浏览编辑、查询检索、统计分析及动态监测等特点的空 间数据库系统。本文就建立这一数据库系统的技术方法、设计思路、系统组成和GIS的应用等方面进行了阐述。     

Structure of the Transkei Basin and Natal Valley, Southwest Indian Ocean, from seismic reflection and potential field data

Marine geophysical data from the southern Natal Valley and northern Transkei Basin, offshore southeast Africa, were used to study the structure of the crust and sedimentary cover in the area. The data includes seismic reflection, gravity and magnetics and provides information on the acoustic basement geometry (where available), features of the sedimentary cover and the basin's development. Previously mapped Mesozoic magnetic anomalies over a part of the basin are now recognized over wider areas of the basin. The ability to extend the correlation to the southeast within the Natal Valley further confirms an oceanic origin for this region and provides an opportunity to amplify the existing plate boundary reconstructions.The stratigraphic structure of the southern Natal Valley and the northern Transkei Basin reflects processes of the ocean crust formation and subsequent evolution. The highly variable relief of the acoustic basement may relate to the crust formation in the immediate vicinity of the continental transform margin. Renewed submarine seismicity and neotectonic activity in the area is probably related to the diffuse boundary between the Nubia and Somalia plates.2.5-D crustal models show that a 1.7–3.2-km-thick sediment sequence overlies a 6.3±1.2-km-thick normal oceanic crust in the deep southern Natal Valley and Transkei Basin. The oceanic crust in the study area is heterogeneous, made up of blocks of laterally varying remanent magnetization (0.5–3.5 A/m) and density (2850–2900 kg/m³). Strong modifications of accretionary processes near ridge/fracture zone intersections may be a reason of such heterogeneity.     

Flow and turbulence structure across the ripple–dune transition: an experiment under mobile bed conditions

Current knowledge of flow and turbulent processes acting across the sand bed continuum is still unable to unequivocally explain the mechanism(s) by which ripples become dunes. Understanding has been improved by comparative high-resolution studies undertaken over fixed bedforms at different stages in the continuum. However, these studies both ignore the role of mobile sediment and do not examine flow structure during the actual transition from ripples to dunes. The aims of the paper are: (i) to describe flow and turbulence characteristics acting above mobile bedforms at several stages across the transition; and (ii) to compare these data with those arising from experiments over fixed ripples and dunes. Laboratory experiments are presented that examine the turbulence structure across seven distinct stages of the transition from ripples to dunes. Single-point acoustic Doppler velocimeter sampling at three flow heights above a developing mobile boundary was undertaken. Time-averaged statistics and the instantaneous quadrant record reveal distinct changes in flow structure either side of the change from ripples to dunes. Initially, shear-related, high-frequency vortex shedding dominates turbulence production. This increases until two-dimensional (2D) dunes have formed. Thereafter, turbulence intensities and Reynolds stress decline and three-dimensional dunes exhibit values found over 2D ripples. This is the result of shear layer dampening which occurs when the topographically-accelerated downstream velocity increases at a faster rate than flow depth. Activity at reattachment increases due to high velocity fluid imparting high mass and momentum transfer at the bed and/or wake flapping. Suspended sediment may also play a role in turbulence dampening and bed erosion. Ejections dominate over sweeps in terms of event frequency but not magnitude. Strong relationships between inward interactions and sweeps, and ejections and outward interactions, suggest that mass and momentum exchanges are dependent upon activity in all four quadrants. The results contradict the notion present in most physical models that larger bedforms exhibit most shear layer activity. Consequently an improved model for the ripple–dune transition is proposed.     

基于ASP.NET的滑坡实时监测数据网上发布系统设计与实现

基于Asp．Net是目前数据库开发应用的新趋势。文章分析了Asp．Net特点的条件下，提出利用．net技术，采用Ado．Net数据访问组件，建立基于用户层、数据库服务层、业务逻辑层的3层结构框架的地质灾害实时数据发布系统。并从数据库表设计、功能设计等方面进行了系统构建的分析，结合身份验证、监测数据的发布、监测曲线的发布等方面说明了系统实现过程，最后给出了一个基于此设计建立的实例，说明了通过Internet采用最新的．net技术，可以便利地建立耦合最新的、实时的、多类滑坡动态监测数据、滑坡基础灾害资料、实时气象数据等于一体的图文并茂的滑坡灾害网上实时发布系统。     

斯通利波在碳酸盐岩储层解释中的应用

在塔河油田碳酸特岩裂缝性储层中，采用声波全波列测井及偶极横波测井来获取丰富信息，主要成分波有纵波、横波、斯通利波，主要采用时域和频域2种信启、提取方法，来获得声波时差、频率和能量信息．其能量衰减和能量值的大小可以反映地层渗透性能，斯通利波能量的相对变化可用来定性划分渗透层，反射波能量反映渗透性地层的裂缝分布，为划分渗透层提供了良好的条件．     

Monitoring land subsidence in Semarang,Indonesia

Semarang is one of the biggest cities in Indonesia and nowadays suffering from extended land subsidence, which is due to groundwater withdrawal, to natural consolidation of alluvium soil and to the load of constructions. Land subsidence causes damages to infrastructure, buildings, and results in tides moving into low-lying areas. Up to the present, there has been no comprehensive information about the land subsidence and its monitoring in Semarang. This paper examines digital elevation model (DEM) and benchmark data in Geographic Information System (GIS) raster operation for the monitoring of the land subsidence in Semarang. This method will predict and quantify the extent of subsidence in future years. The future land subsidence prediction is generated from the expected future DEM in GIS environment using ILWIS package. The procedure is useful especially in areas with scarce data. The resulting maps designate the area of land subsidence that increases rapidly and it is predicted that in 2020, an area of 27.5 ha will be situated 1.5–2.0 m below sea level. This calculation is based on the assumption that the rate of land subsidence is linear and no action is taken to protect the area from subsidence.