数字遥测地震台网数据管理与服务系统(MASS系统)的系统方案

介绍了基于Internet／Intranet标准的数字遥测地震台网数据管理与服务系统(MASS系统)通过互联网信息发布实现的方案。该方案采用Windows2000server和ⅡS5．0平台，利用ASP技术和脚本语言JavaScript，VbScript及HTML技术，响应浏览器端的动态请求，实现诸如数据管理、数据服务和在线评比等功能，并根据用户请求完成波形数据和相应处理软件的下载。     

Closed-form solution of P4P or the three-dimensional resection problem in terms of Möbius barycentric coordinates

 The perspective 4 point (P4P) problem - also called the three-dimensional resection problem - is solved by means of a new algorithm: At first the unknown Cartesian coordinates of the perspective center are computed by means of M?bius barycentric coordinates. Secondly these coordinates are represented in terms of observables, namely space angles in the five-dimensional simplex generated by the unknown point and the four known points. Substitution of M?bius barycentric coordinates leads to the unknown Cartesian coordinates (2.8)–(2.10) of Box 2.2. The unknown distances within the five-dimensional simplex are determined by solving the Grunert equations, namely by forward reduction to one algebraic equation (3.8) of order four and backward linear substitution. Tables 1.–4. contain a numerical example. Finally we give a reference to the solution of the 3 point (P3P) problem, the two-dimensional resection problem, namely to the Ansermet barycentric coordinates initiated by C.F. Gau? (1842), A. Schreiber (1908) and A.␣Ansermet (1910). Received: 05 March 1996; Accepted: 15 October 1996     

Closed form solution to the twin P4P or the combined three dimensional resection-intersection problem in terms of Möbius barycentric coordinates

The twin perspective 4 point (twin P4P) problem – also called the combined three dimensional resection-intersection problem – is the problem of finding the position of a scene object from 4 correspondence points and a scene stereopair. While the perspective centers of the left and right scene image are positioned by means of a double three dimensional resection, the position of the scene object imaged on the left and right photograph is determined by a three dimensional intersection based upon given resected perspective centers. Here we present a new algorithm solving the twin P4P problem by means of M?bius barycentric coordinates. In the first algorithmic step we determine the distances between the perspective centers and the unknown intersected point by solving a linear system of equations. Typically, area elements of the left and right image build up the linear equation system. The second algorithmic step allows for the computation of the M?bius barycentric coordinates of the unknown intersected point which are thirdly converted into three dimensional object space coordinates {X,Y,Z} of the intersected point. Typically, this three-step algorithm based upon M?bius barycentric coordinates takes advantage of the primary double resection problem from which only distances from four correspondence points to the left and right perspective centre are needed. No orientation parameters and no coordinates of the left and right perspective center have to be made available. Received 1 May 1996; Accepted 13 September 1996     

龙门山地区泥盆纪碳酸盐与硅质碎屑的混积相与混积机理

碳酸盐与陆源碎屑的混合沉积研究至今尚未引起足够重视。文献屈指可数。扬子西经缘龙门山地区盆纪发育了了这类良好的混合沉积。作者根据实际材料，首次从这一思路出发，识别该区泥盆纪Ｅｍｓｉａｎ期到Ｇｉｖｅｔｉａｎ早期的混积相四种，混积亚相约１４种，阐明了其优势混积作用；根据混积作用特征、沉积背景关系，划分出两大混积类型，即泥质背景下的混积１型和砂灰质背景下的混积Ⅱ型；对混积作用机理进行了探讨；并指出不同级次     

扬子与华北太宙基底差异的 Sm-Nd 同位素和 REE 新证据

本文通过对扬子崆岭杂岩和华北太华群和阜平群新太古代和古元古代斜长角闪岩、TTG片麻岩 Sm-Nd同位素和REE对比研究，讨论了同时代岩石对地壳主体增生时代、地幔性质和演化规律的揭示，表明两克拉通属不同大陆岩石圈陆块。     

山水风景旅游资源开发利用研究

风景是旅游资源的精华和主体，山水风景作为风景的主体，在旅游开发中既是主要的观赏客体，又起到风景总特征基本骨架作用。山水风景旅游资源开发潜力很大，以山水风景观察游鉴为主要目的旅游仍然是当前和今后旅游活动的基本形式。     

宁夏灵盐地区荒漠化灾害与农牧业持续发展

分析了宁夏灵盐地区荒漠化灾害过程中自然环境与人力活动的相互作用，并讨论了区域农牧业经济发展的“退耕还牧”治沙等社会问题。在第四纪地质时期荒漠化的发生发展是一种“气候－地貌”的自然过程；在人类历史时期是气候主控下人为叠加干扰的“自然－人为”地貌过程。自然环境与人为活动具有使荒漠化发生正向或逆转变化的双重机制。     

锇粉中杂质元素分析方法研究

利用ＩＣＰ＿ＭＳ技术建立了锇粉中痕量杂质元素的分析方法。在浓ＨＮＯ３介质中，锇以ＯｓＯ４形式挥发除去，分离锇基体后，可直接测定的痕量元素达５０余种。取样量０．１ｇ，测定限为０．２～２４６ｎｇ／ｇ，可实现质量分数ｗ（Ｏｓ）为９９．９９９９％锇粉中杂质元素测定。结合ＩＣＰ＿ＡＥＳ测定Ｋ、Ｎａ、Ｃａ、Ｍｇ、Ａｌ、Ｆｅ、Ｓｉ和Ｐ，可实现锇粉原料及产品的纯度分析。     

中子活化分析在铼—锇法年龄测定中的应用

同位素稀释中子活化分析铼与感耦等离子体质谱法测定锇相结合，应用于辉钼矿及铜＿镍硫化物矿物的铼＿锇年龄测定，取得了满意的结果，扩大了铼＿锇测年法的应用范围。     

北京西山地面塌陷的形成因素浅析

地下采矿是地面塌陷失决条件，自然重力及其他外界触发因素是其发展动因，地面塌陷受覆岩时代及岩性，采空区尺寸大小，煤层倾角，煤层厚度及开采深度，重复采动，水文条件变化，地形地势和松散盖层的影响。