变形交通线路图自动制作方法

城市交通网络规模的不断扩大使得交通线路图成为一种常用地图。为了提高信息的传输效率，更好地保证图形的清晰易读性，出现了变形交通线路地图^[1]。本文分析了变形交通线路图特性并对其自动制作过程进行了总结。为解决制作过程中地图符号冲突问题，提出了作用力驱动站点位移的交通线路图变形压缩方法。建立交通线路图中站点受力移动模型并设计了以坐标轴为轴心的移位算法。试验表明，该算法能够有效解决地图符号冲突问题，为完全自动制作变形交通线路图建立了基础。     

Couplex Benchmark Computations Obtained with the Software Toolbox UG

This paper describes the numerical results for the COUPLEX benchmark obtained with the simulation software UG using vertex centered finite volume and higher order discontinuous Galerkin schemes. Multigrid solvers on unstructured grids, local mesh refinement and parallel computation are employed to yield very accurate solutions. Since the full range of results required in the benchmarks is too large to be displayed in this paper we focus on the comparison of discretization schemes, assessment of numerical errors and the presentation of parallel computations.     

Use of Systematic, Palaeoflood and Historical Data for the Improvement of Flood Risk Estimation. Review of Scientific Methods

The catastrophic floods recently occurring in Europe warn of the critical need forhydrologic data on floods over long-time scales. Palaeoflood techniques provideinformation on hydrologic variability and extreme floods over long-time intervals(100 to 10,000 yr) and may be used in combination with historical flood data (last1,000 yr) and the gauge record (last 30–50 yr). In this paper, advantages anduncertainties related to the reconstruction of palaeofloods in different geomorphologicalsettings and historical floods using different documentary sources are described.Systematic and non-systematic data can be combined in the flood frequency analysisusing different methods for the adjustment of distribution functions. Technical toolsintegrating multidisciplinary approaches (geologic, historical, hydraulic and statistical)on extreme flood risk assessment are discussed. A discussion on the potential theoreticalbases for solving the problem of dealing with non-systematic and non-stationary data ispresented. This methodology is being developed using new methodological approachesapplied to European countries as a part of a European Commission funded project (SPHERE).     

二维介质柱的电磁成像研究

从体等效原理出发得到用介质柱介电参数表示的体等效电流,并得到一个积分方程组求解散射问题．利用变分原理,对此方程组求变分,并化为矩阵方程组,消去含介质柱内总场变化的项,得到散射场变化与介质柱介电参数变化之间关系的矩阵方程．即反演方程．用算例检验此法的反演精度、收敛性能、多目标反演能力、抗噪声性能及利用不完备测量散射信息反演目标的能力．结果表明,此法是一种实用性很强的二维介质柱电磁成像方法．     

Advanced argillic lithocaps in the Bolivian tin-silver belt

Zones of advanced argillic alteration constituting lithocaps are commonplace in the shallow parts of porphyry copper systems. Similar lithocaps are also recognized in the shallowly eroded southern part of the Bolivian tin-silver belt, where mineralization typically is centred on felsic volcanic domes. A well-preserved lithocap at Potosí is dominated by vuggy residual quartz and contained the world's largest silver resource, whereas the basal remnant of a lithocap at Pulacayo is composed of barren quartz-alunite. Minor gold occurs in the structurally controlled roots of a lithocap at Tasna. The mineralization in these lithocaps is of high-sulphidation type and was generated in the epithermal environment. In contrast, the tin- and base metal-bearing massive sulphide veins and associated sericitic and quartz-tourmaline alteration that underlie the Bolivian lithocaps are typified by sulphides of low sulphidation state, but are dominantly mesothermal rather than epithermal in character. Magma chemistry is believed to account for the characterization of Bolivian lithocaps by silver-tin-antimony and porphyry copper lithocaps by gold-copper-arsenic. Low-grade, bulk-tonnage silver mineralization within Bolivian lithocaps and high-grade tin-bearing veins concealed beneath them both constitute attractive exploration objectives. Received: 13 February 1998 / Accepted: 11 March 1998     

内蒙古乌拉山金矿带硫同位素特征研究

本文对乌拉山金矿带西段硫同位素组成特征进行了研究,同时参照前人对东段硫同位素研究成果,对比东、西两段硫同位素组成特点。同时计算了硫化物沉淀时同位素的平衡温度,探讨了硫的来源。认为硫主要来源于深源重熔岩浆热液。在乌拉山金矿形成过程中,亦有非岩浆物质——变质岩中轻硫成分的混入。     

超临界流体萃取技术的应用及展望

简介了超临界流体萃取（ＳＦＥ）技术的发展,包括超临界流体（ＳＦ）的性质、可以形成最好的ＳＦ的物质、ＳＦ仪器、ＳＦＥ技术的历史及应用研究现状和对ＳＦＥ技术的展望。引用主要文献３７篇。     

大气有机污染分析和评价：Ⅲ.美国迈阿密市大气有机污染监测与分析

自１９９４年６月至１９９５年３月对（美）迈阿密市大气颗粒物及干、湿沉降物中的多种有机化合物进行了定量分析与监测，并依据分析结果结合分子参数对有机污染水平的季节性变化、气候条件影响和清除机理等进行了探讨。     

小肝癌的MR诊断：几种序列FMPPGR动态增强及延迟扫描的特点

小肝癌的ＭＲ诊断：几种序列ＦＭＰＰＧＲ动态增强及延迟扫描的特点刘爱莲，郎志谨，袁越，傅维利大连医科大学附属一院放射科，１１６０１１大连市友谊医院外科摘要：本文总结了３６例经病理及临床证实的小肝癌的ＭＲ征象，探讨了小肝癌的Ｔ１ＭＩ，Ｔ２ＷＩ抑脂ＳＥ序列...     

古丝绸之路与新亚欧大陆桥：河西走廊经济发展思考

河西走廊在古丝绸之路中占有重要的地位和作用。新亚欧大陆桥开通之后，河西能否依桥再现辉煌，必须从古丝路与新陆桥的特点出发，作对比研究。本文分析了沿海和沿桥的历史特点与现状，提出了河西经济发展应采取的积极主动对策，即主动上桥、逼桥赐惠；人车分离与千方引客；西进东出、走出封闭。