智能大厦接地电阻检测中应注意的问题

根据目前常用接地电阻检测仪器的测量原理，对在日常检测中所出现导致接地电阻检测数据失真的情况进行了分析和探讨，同时针对不同的成因，提出了不同的解决方法。     

三维正交各向异性孔隙介质震电波场数值模拟研究

各向异性等介质物性参数会对震电波场的传播产生影响.为了定量研究介质物性参数对震电波场传播的影响, 本文首先研究了三维正交各向异性介质的震电耦合方程, 然后采用时域有限差分方法模拟了爆炸源在该介质中的震电响应.在数值模拟中, 首先计算地震波场, 然后把地震波场作为输入来计算伴随电场.为了验证数值算法的精度, 我们将数值结果与从Pride方程获得的解析解进行了对比, 结果表明数值解可以很好地近似解析解.我们设计了几种各向异性模型, 分析了介质物性参数对震电波场的影响, 结果表明爆炸源在各向异性孔隙介质中会产生四种地震波, 分别是快慢纵波和两个可分离的横波.产生的地震波都会在均匀各向异性孔隙介质中产生伴随电场.弯曲度对慢纵波的传播有影响, 当弯曲度为各向异性时, 慢纵波的波场快照为椭圆形, 当弯曲度为各向同性时, 慢纵波的波场快照为圆形.

     

Numerical Investigation of the Galactic Problem by Computing Families of Periodic Solutions

The galactic dynamical system expressed by a third-order axisymmetric polynomial potential is investigated numerically by computing periodic solutions. We define as Sthe compact set of initial conditions generating bounded motions, and as S ^p , with S ^p ? S, the countable set of all initial conditions generating periodic solutions. Then, we consider the subsets S _s ^p and S _a ^p of S ^p , where S _s ^p ∪ S _a ^p = S ^p , S _s ^p S _a ^p = Ø, the first of which corresponds to symmetric periodic solutions, and the second to asymmetric solutions. Then, we approximate the set S _s ^p , leaving treatment of the set S _a ^p of asymmetric solutions for a future publication. The set S _s ^p is known to be dense in S (‘Last Geometric Theorem of Poincar;’, Birkhoff, 1913). Using a computer programme capable to locate all elements of the set S _s ^p that generate symmetric periodic solutions that re-enter after intersecting the axis of symmetry from 1 to ntimes. The results of the approximation of S _s ^p in the total domain and in the sample sub-domains of zooming, we present in graphical form as family curves in the (x, C) plane. The solutions located with the largest periods re-enter after 440 galaxy revolutions while the families calculated fully (initial conditions, period, energy, stability co-efficient) include solutions that re-enter after 340 galaxy revolutions. To advance further the approximation of the set S _s ^p thus obtained, we applied the same procedure inside eight sub-domains of the domain Sinto which we ‘zoomed’ through selection of finer search steps and double maximum periods. The family curves thus calculated presented in the (x, C) plane do not intersect anywhere in some sub-domains and their pattern resembles that of laminar flow. In other sub-domains, however, we found family curves from which branching families emanate. The concepts of completeand non-completeapproximation of S _s ^p in sub-domains of laminar and sub-domains with branching family curves, respectively, is introduced. Also, the concept of basic family of order1, 2, ..., n, are defined. The morphology of individual periodic solutions of all families is investigated, and the types of envelopes found are described. The approximate set S _s ^p was also checked by computing Poincar; sections for energy values corresponding to the mean energy range of the eight sub-domains of zooming mentioned above. These sections show that most parts of the compact domain in Sgenerating non-periodic but bounded solutions correspond to with well-shaped tori that intersect the x-axis, a fact that implies that dominant to exclusive type of periodic solutions are the symmetric ones with two normal crossings of this axis. The presence of non-symmetric periodic solutions as well as of chaotic regions is encountered. All calculations reported here were performed using the variable step R-K 8th-order direct integration and setting the allowable energy variation Δ C= |C _start? C _end| < 10^?13. The output, consisting of many thousands of families and their properties (initial conditions, morphology, stability, etc.), is stored in a directory entitled ‘Atlas of the Symmetric Periodic Solution of the Galactic Motion Problem’.     

Hydrochemistry and solution rates in gypsum karst: case study from the Western Ukraine

The gypsum karst in the Western Ukraine spreads through a large territory covering more than 20,000 km² and is represented by a range of stages (evolutionary types), from deep-seated through subjacent to entrenched. Correspondingly, hydrogeological settings of karst development, circulation patterns and chemical characteristics of groundwaters differ substantially between the respective areas. Based on 1,800 analyses, this paper summarises hydrochemistry of the gypsum-hosting Miocene aquifer. The majority of sampling has been performed in conjunction with a study regime of gypsum solution rates by means of standard tablets. In this study, which included 53 tablet stations representing varying conditions of water-rock interaction, 644 weight-loss measurements were made over the period 1984–1992. The highest rates are characteristic of entrenched karst although active dissolution is localised along well-defined sinking streams with short underground courses, rare vertical percolation paths and the water table. Lower but still quite substantial rates are characteristic of subjacent and deep-seated (confined) karst. However, the overall dissolution removal is greater due to higher flow through the gypsum and the larger area of rock-solvent contact. The results are generalised in order to derive the approximate solution rates characterising major situations and to be suitable for modeling purposes.     

红土型金矿中痕量金分析应用研究

总结红土型金矿运用痕量金分析的理论基础,对不同金标样样品进行准确度、精密度检查,表明痕量金分析可以满足矿点的检查、异常查证的基本要求。与室内法相比,本法有方便、快捷、低成本、高效率及易掌握等特点。     

面向地质导向的地层智能评价解决方案

地质导向系统基于井下实时测量的地质、地球物理和钻井参数,优化三维井轨迹到油气藏指定位置以获得最大的泄油面积和最佳的采收率,成为提高单井油气产量和油田开发效益的前沿技术,面临低孔-低渗-强非均质储层等地质难题和高温-高压-强振动等钻井工程难题.本文在梳理地质导向系统硬件、软件和人员等组成的基础上,将地质导向系统划分为基于地层构造的轨迹地质导向、识别储层岩性的油藏地质导向和面向地层成分的产能地质导向三个阶段;以分辨率更高、更直观的露头为例,阐述了地质导向系统构造-岩性-成分三个层次的逻辑关系.本文提出数据采集-信息融合-态势感知-地层智能评价的地质导向智能评价方案：按照学科门类,考虑数据的来源、采集时间和空间分辨率等因素,梳理出地层智能评价所需的数据类型与数据特征;提出地质导向多源异构数据数据级-特征级-决策级信息融合分类,并梳理了相关算法;根据数据模型与先验经验对当前钻井状态、地质环境进行态势评估,采用机器学习等算法对钻井模型和地质模型进行态势预测;提出初导和精导的理念,按照构造-岩性-成分三个层次厘定了地层智能评价的精导技术要点.该地质导向智能评价方案应用到实际油田的地质导向作业,验证了技术方案的可靠性和实用性,可为未来的井下智能闭环研究提供借鉴.     

突出重点 讲求效益：切实加强溶浸地质工作

本文从目前我国铀矿地质面临的形势和国内外铀矿地质发展的实际情况出发论述了寻找经济可采用可溶浸的铀矿床是我国铀矿地质工作目前的必然选择。铀矿地质工作必须以经济效益为中心，近期的主攻方向是寻找经济可溶浸的铀矿床，尤其是寻找可地浸砂岩型铀矿床。文中还提出了确保铀矿地质找矿目标顺利实际的几项措施。     

江西桃山大布铀矿床实验室溶浸工艺试验研究

本文介绍了大布铀矿床的物质成分、该类型铀矿提取和回收工艺条件的研究及取得的最佳溶浸工艺参数。试验表明,大布矿床铀浸出性能好,酸耗低,用溶浸法开采具有良好的前景。与常规工艺试验相比,该研究工作的主要特点表现为：溶浸剂的硫酸配方改变了常规工艺从高到低的布液方式,采用由低到高再低的方式,有效地避免了硫酸钙的沉淀;选择了廉价高效的氧化剂,提高了浸出率。通过工艺试验为下一步开展堆浸或原地破碎浸出半工业试验,重新评价桃山矿田提供了技术依据。     

电解质水溶液的结构

本文叙述了盐湖中主要离子Ｌｉ＋、Ｎａ＋、Ｋ＋、Ｍｇ２＋、Ｃａ２＋、Ｃｌ－、ＳＯ＿４￣２－、ＮＯ＿３和纯水的结构，介绍了主要研究方法Ｘ射线衍射．分析了溶液结构研究历史和现状，对溶液结构研究的未来进行了展望．     

溶液结构的X射线衍射研究—1实验技术

本文介绍了Ｘ射线衍射法测定液体结构的一些实验技术，包括光源波长和稳定性、单色Ｘ射线的获得、测量条件的选择、实验数据的校正等。