基于DOM树和递归X—Y分割算法的Zone树模型

在分析DOM树的基础上提出一种基于DOM树和递归X—Y分割算法,可以根据网页的几何布局生成Zone树模型。描述了将Zone树模型和递归X—Y算法应用到文献数据检索的优越性,给出构建Zone树模型的算法。该模型主要用于在线文献的数据提取,具有速度快、准确性高等特点,优于目前大多数浏览器所采用的DOM树结构。     

黄土包气带水分运移的现场研究

本文主要介绍在核素迁移试验现场进行的黄土包气带水分运移研究的方法和主要结果。包气带水分运移试验场建有一座 9.0 m深的负压计观测竖井和二个 2 8.0 m深的中子仪测管。分别采用 WM- 1型负压计系统和 IHiii型土壤中子水分仪测量黄土剖面的基质势和含水量。一组负压计和中子仪测管在天然条件下测量 ,连续观测 2年多 ,用于水分运移特征研究 ;另一组测量停止淹灌后的水分再分配过程 ,连续观测 7个月 ,用于非饱和渗透系数测定。结果表明 :(1)降雨入渗主要影响深度、蒸发影响深度在 1.0 m以上 ;(2 )水分运移可分为 4个带 :1.0 m深度以上为强交替带 ,含水量、水势和水势梯度随时间变化快、变幅大 ,液态水的运移比较明显 ;1.0～ 7.2 m深度上为含水量和水势随时间变化小的弱交替带 ,除黄土颗粒大小变化较大的深度处 ,一般来说 ,水势梯度方向单向向下 ,其中 :含水量和水势在 1.0～ 1.6 m深度上随时间变化较大 ,液态水的运移也比较明显 ;在 5.0～ 7.2 m深度上 ,水分变化很小 ,基本趋于稳定状态 ,液态水的运移很不明显 ,微弱的热水汽扩散显现出来 ;在 7.2～ 2 3.0 m深度上 ,含水量除在黄土 -古土壤 -钙质结核层组合交界处有变化外 ,其余则基本保持与黄土颗粒大小变化相对应的稳定状态 ,为水分运移的传递带 ;2 3.     

核或辐射应急计划基本概念的最新发展

自９０年代以来,特别是切尔诺贝利事故后,ＩＣＲＰ明确提出了干预的辐射防护体系,核或辐射应急计划的很多方面有了进一步的发展,国际组织（ＩＣＲＰ、ＩＡＥＡ等）对他们原先的建议进行了若干重要修改,其中包括干预水平、应急计划类型、应急计划区、应急等级和集成应急计划等基本概念。与此同时,国际上对先进核电厂要求从设计上减少事故对场外的影响,免除对周围居民快速撤离之类的应急计划要求。本文对这些基本概念的发展及其     

黄土包气带土壤水特征曲线研究

本文主要介绍在中国辐射防护研究院野我试验场从地表到潜水ｍ深范围内４６个土芯样的水特征曲线的测量方法及测量结果。     

黄土包气带水分运移的现场研究

本文主要介绍了在核素迁移试验现场进行的黄土包气带水分运移研究的方法和主要结果。包气带水分运移试验建有一座９．０ｍ深的负压计观测竖井和二个２８．０ｍ深的中子仪测算。     

光栅衍射缝间干涉因子次极大强度对称性的菲涅耳半波带法证明

本文用菲涅耳半波带法推导出了一个非常有用的次极大位置公式,将该位置公式和振幅矢量法求出的次极大位置结合起来,方便地求出了缝间干涉因子的次极大的强度,证明了缝向干涉因子的次极大强度具有对称性。避免了对振幅矢量法求次极大位置这个方程的直接求解,因为用该方法求出的次极大强度与理论值完全符合,说明菲涅耳半波带法不但可以用来分析单缝衍射,同时还完全能够用来分析光栅衍射。     

基于菲涅尔区修正结构的多波束自适应天线

菲涅尔区相位修正结构具有类似于二次曲面的聚焦特性和更好的偏轴扫描特性,将该结构与馈源阵列相组合,并通过用改进的ＬＭＳ算法对馈源阵列输出的自适应信号处理,实现了对来波方向的估计和数字波束形成,从而构成了一类新型的多波束自适应天线。计算机模拟的有关结果证实了其可行性。     

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??Due to downhole complexities, shale-gas horizontal well fracturing in the Sichuan Basin suffered from casing deformation and failure to apply the technique of cable-conveyed perforation bridge plug. In view of these problems, a new technique of staged volume fracturing with temporary plugging by sand filling is employed. Based on theoretical analyses and field tests, a design of optimized parameters of coiled tubing multi-cluster sand-blasting perforation and temporary plugging by sand filling was proposed. It was applied in the horizontal Well ZJ-1 in which casing deformation occurred. The following results are achieved in field operations. First, this technique enables selective staged fracturing in horizontal sections. Second, this technique can realize massive staged fracturing credibly without mechanical plugging, with the operating efficiency equivalent to the conventional bridge plug staged fracturing. Third, full-hole is preserved after fracturing, thus it is possible to directly conduct an open flow test without time consumption of a wiper trip. The staged volume fracturing with temporary plugging by sand filling facilitated the 14-stage fracturing in Well ZJ-1, with similar SRV to that achieved by conventional bridge plug staged fracturing and higher gas yield than neighboring wells at the same platform. Thus, a new and effective technique is presented in multi-cluster staged volume fracturing of shale gas horizontal wells.     

汉字图形字符的输入与应用

针对微机汉字操作系统使用中遇到的一些问题,本文介绍汉字图形字符的输入与应用,文末给出用C语言编制的应用程序,该程序提供了一种显示或打印汉字图形字符区位码表的方法,同时它还可用于检查汉字操作系统所提供的显示和打印用汉字库的完整性、正确性及扩充性。     

2D BASIN MODELLING IN THE EASTERN VARISCAN FOLD BELT (CZECH REPUBLIC): INFLUENCE OF THRUSTING ON PATTERNS OF THERMAL MATURATION

This study evaluates the geothermal history of Palaeozoic sedimentary rocks from the easternmost part of the Variscan external zone in the NE Czech Republic. The objective was to investigate the geothermal history of pre‐Variscan Palaeozoic carbonates in the study area, and to assess its relationship with that of the overlying Variscan flysch. In the study area, the Palaeozoic succession occurs at the surface or is overlain by Miocene sediments of the Carpathian Foredeep. Palaeozoic nappes and the main Variscan overthrust have been documented in the subsurface at the deep Pot?tát‐1borehole. Vitrinite reflectance measurements on 38 samples from the Pot?tát‐1 well and 19 samples from nearby surface outcrops and shallow boreholes were available. A 2D thermal model was created using PetroMod and the thermal maturity evolution was modelled by EASY%Ro. The thermal model was constructed based on interpretations of two NW‐SE seismic profiles (lines 5/83 and 5/84) oriented perpendicular to the main Variscan thrusts. The results were calibrated using measured vitrinite reflectance and were adjusted with 1D models from three shallow boreholes. At the Pot?tát‐1 borehole, modelled maximum palaeo‐temperatures of the Variscan flysch (Moravice Formation) ranged from 310°C at a depth of 7.3 km (the top of the preserved succession) to 395°C at the base of the succession, resulting in thermal maturities of >4%R_r. Peak maturation occurred prior to the end of Variscan thrusting. Modelling suggests that the basal heat flow for these thrust units reached a maximum value of 63 mW/m² at 325 Ma. In addition, the modelling suggests that the maturity of the Palaeozoic carbonates was controlled by the thickness of the overlying Variscan flysch nappes. Maximum palaeo‐temperatures for the Palaeozoic carbonates ranged from 265°C at the top of the interval (at a depth of 7.1 km) to 290°C at the base, resulting in a maturity of 3.8 to >4%R_r which is within the dry gas window. The study suggests that basal heat flows in the original (pre‐thrust) Early Carboniferous sedimentary basin were slightly higher than those in the post‐thrust location for the Variscan flysch nappes. This should be taken into account when evaluating the petroleum system in the South Moravian oil province (SW Czech Republic) where a complete sedimentary sequence has not been preserved.