旋转雁行断裂的三维构造型式初探─—以西华山脉状钨矿构造为例

西华山矿脉的三维雁行型式受岩体弧形界面的控制呈有规律的变化，为适应这一研究的需要，采用赤平投影方法建立了完整的三维雁行型式，并利用旋转模型模拟旋转雁行断裂的形成过程，模拟结果系统地揭示了旋转雁行断裂三维型式变化的条件和规律。三维雁行断裂型式的建立具有普遍的意义。     

Robust regression in biological assay: application to the evaluation of alternative experimental techniques

Summary Robust Huber type regression and testing of linear hypotheses are adapted to statistical analysis of parallel line and slope ratio assays. They are applied in the evaluation of results of several experiments carried out in order to compare and validate alternatives to animal experimentation based on embryo and cell cultures. Computational procedures necessary for the application of robust methods of analysis used the conversational statistical package ROBSYS. Special commands for the analysis of parallel line and slope ratio assays have been added to ROBSYS.     

基于GIS的农业地下潜水资源监测系统的分析与设计

通过对系统的需求分析，基于GIS平台的二次开发技术，设计了农业地下潜水资源监测系统。     

偶偶Cd同位素核的负宇称带研究

作者将具有正宇称的gds轨道空间扩大到包含具有负宇称的1h11/2轨道，采用修正的表面δ相互作用（MSDI），对^106Cd和^108Cd两个偶偶核作了形变Hatree-Fock(HF)计算，得到了基态和一些激发态的解，同时，还用近似角动量投影形变Hartree-Fock(PDHF)方法，对^106Cd和^108Cd进行了能谱计算，得到其正、负宇称带的解，计算结果与实验谱基本一致。     

解不确定型决策问题的投影寻踪方法

不确定型决策问题在系统工程理论与实践中具有重要意义 ,其益损值矩阵反映了该问题的复杂性和不确定性 ,同时也反映了决策者所面临的收益机会和损失机会的风险信息 ,目前常用方法利用益损值矩阵的信息都不充分 .指出求解该问题的实质 ,就是如何把益损值矩阵转换为压缩向量 ,该压缩向量的最大分量所对应的方案就是所求的最优方案 .为全面处理这种机会风险 ,提出了基于遗传算法的投影寻踪方法的新途径 .研究结果表明 ,根据益损值矩阵所反映的收益机会的风险与损失机会的风险的对比情况 ,投影寻踪方法既可积极地也可稳妥地选取最优方案 ,利用益损值矩阵的信息比常用方法充分 ,可根据决策者所面临的机会风险能进能退.     

空间两条不相交管路的最短连接的图解和计算

本文用图解对辅助平面法,换面法和旋转法进行分析比较,从中得出简易可行的最佳方法,亚进行解析运算。使空间两条不相交管路的最短连接距离在“形”与“数”两个方面得到较好解决。     

A reduction algorithm for approximating a (nonmetric) dissimilarity by a tree distance

We propose a development stemming from Roux (1988). The principle is progressively to modify the dissimilarities so that every quadruple satisfies not only the additive inequality, as in Roux's method, but also all triangle inequalities. Our method thus ensures that the results are tree distances even when the observed dissimilarities are nonmetric. The method relies on the analytic solution of the least-squares projection onto a tree distance of the dissimilarities attached to a single quadruple. This goal is achieved by using geometric reasoning which also enables an easy proof of algorithm's convergence. This proof is simpler and more complete than that of Roux (1988) and applies to other similar reduction methods based on local least-squares projection. The method is illustrated using Case's (1978) data. Finally, we provide a comparative study with simulated data and show that our method compares favorably with that of Studier and Keppler (1988) which follows in the ADDTREE tradition (Sattath and Tversky 1977). Moreover, this study seems to indicate that our method's results are generally close to the global optimum according to variance accounted for.We offer sincere thanks to Gilles Caraux, Bernard Fichet, Alain Guénoche, and Maurice Roux for helpful discussions, advice, and for reading the preliminary versions of this paper. We are grateful to three anonymous referees and to the editor for many insightful comments. This research was supported in part by the GREG and the IA² network.     

对国家标准《技术制图图样画法视图》中关于向视图及其相关问题的研究

本文对GB／T17451－1998《技术制图 图样画法 视图》中第62款向视图的定义、标注、图例进行剖析以及对相关问题的研究，从投影原理的层面上进行阐述问题。并对上述条款提出补充说明。     

对吴氏网(极射赤平投影)应用的扩展

在地质、天文、结晶等学科领域里应用吴氏网,能迅速、便利和较精确地解决许多空间角度计算问题。本文研究了利用吴氏网求解任何一地某日昼夜的长度及全年中某日太阳直射纬度(太阳赤纬),论述了太阳高度角、方位角、日期、当地纬度及当地时刻等几个参数之间的互求问题,给出了求解球面上任意两点间的球面距的方法。研究表明,吴氏网应用于机械领域中可求解任意一条水平线与任意一条正平线之交角的实际大小,在数学中可代替三角函数表。