Inter-manufacturer Difference and Temperature Dependency of the Fall-Rate of T-5 Expendable Bathythermograph

The fall-rate of the T-5 expendable bathythermograph (XBT) produced by Tsurumi Seiki (TSK) Co., Ltd and that by Sippican Inc., are intercompared by a series of contemporaneous and colocated measurements with conductivity-temperature-depth (CTD) profilers. It is confirmed that the fall-rates of the two manufacturers' T-5 differ by about 5 percent, despite the fact that they had been believed to be identical for many years. The cause of the difference is discussed on the basis of a detailed cross-examination of the two T-5 models. It is found for the first time that the two models are different in several respects. The manufacturer's fall-rate equation is only applicable to the Sippican T-5, for which Boyd and Linzell's (1993) equation seems to be slightly more accurate. Kizu et al.'s (2005) equation gives a clearly less biased depth than the manufacturers' equation for the TSK T-5. It is also found that the fall-rates of both T-5 models are dependent on water temperature, perhaps because of viscosity. The temperature-dependency of the fall-rate of the TSK T-5 is larger than that of the Sippican T-5.     

地下水不稳定混合抽水的模型及模拟方法

本文指出在混合井抽水量已知的情况下,不能预先分配各层的分流量,只能从刻画混合抽水的模型运转中获取。提出“窜流”是混合井孔的最基本特征,建立了符合混合抽水机理的渗流-管流耦合模型.文中提出“折算（层流）渗透系数K1”的概念及其表达式,解决了管流与渗流耦合的困难,并提出了混合井井流的模拟方法。     

矿区工程测量长度变形问题的处理

结合新疆煤矿矿山井巷工程,主要介绍了井巷施工测量长度变形问题的处理,抵偿高程面的选择、测量控制点坐标的归算,使实际测量长度与国家控制点反算长度之差在规定的误差范围内.     

分层密度流体的边界波动在不透水刚性底床的运动行为——Ⅰ造波条件对波型演化的关系

在一座二维内波实验水槽(12 m×0.7 m×0.5 m)、于总水深H等于40 cm的条件下,以淡、盐水依密度分层布置的两层流体,从事孤立内波生成的研究。内波水槽内的上下层水深比H₁/H₂、造波区位能差(η₀)、上下层的密度比皆为实验主要的控制变因。在各种不同实验条件配合之下,试验及比较以上变因对内波振幅能量及相关传递系数的影响,进而产生几种不同的波动特性:上举型孤立内波、下沉形孤立内波、非周期性的重力内波等,且不同形式的重力内波需要配合固定的造波条件使能达成。     

基于组件技术的GIS数据格式转换研究

多源数据格式之间的转换是目前GIS深入应用遇到的重要问题,本文探讨了不同GIS数据之间的转换问题,提出了以组件技术为基础的数据转换自定义接口开发的思路,保证了数据转换的完整性和安全性,优化了GIS数据从制作到发布的流程。并以MapGIS和GeoMed ia为实例叙述了数据转换实施的过程。     

GIS空间数据转换为DXF格式的方法研究

G IS空间数据具有多源性的特征,为数据综合利用和数据共享带来不便,解决多格式数据源集成一直是近年来G IS应用系统开发中需要解决的重要问题[5]。DXF格式作为一种空间数据转换的事实上的标准,对于G IS软件来说,实现两者的数据转换具有重要意义。本文分析了G IS空间数据与AutoCAD数据模型的组织特征,在比较分析的基础上设计了转换方案,并就实现过程中的关键技术进行了论述。     

Receiver functions in northeast China - implications for slab penetration into the lower mantle in northwest Pacific subduction zone

Seismic studies of the subducting lithosphere and the upper mantle discontinuities in the northwest Pacific subduction zone beneath Japan and northeast China have suggested contrary subduction scenarios. There was little consensus on the issue whether the subducting slab penetrates the upper mantle discontinuities into the lower mantle or it is deflected atop of the 660-km discontinuity over several hundred kilometers. We calculate receiver functions from a recent seismic broadband station network located in northeast China and find topographic variations of the upper mantle discontinuities. A deeper-than-normal 660-km discontinuity is observed over an area of 400 km and it coincides with the stagnant slab imaged by seismic tomography. The 660-km discontinuity is locally depressed by more than 35 km and the transition zone is thickened by more than 20 km in the east of the region where it encounters the slab. These observations provide evidence of the slab accumulating in the mantle transition zone and locally penetrating into the lower mantle.     

瑞利波勘探的波长解释法新探

从理论上探讨了瑞利波勘探中波长与深度的内在依托关系,计算了不同泊松比时瑞利波质点运动椭圆轨迹的椭圆率随单位波长深度的关系曲线;通过大量的正演模型计算,探索了瑞利波波长与对应探测深度之间的转换关系问题。