烷基苯热力学性质与分子结构之间的关系研究

计算并研究了烷基苯类化合物拓扑指数n、J、L与其热力学性质△Hf(g)^0、△Gf(g)^0、S(g)^0、logKp之间的相关性和选择性。该文所构建经验公式其相关性近于倪才华的结果，而选择性优于倪才华的。     

空间极值距离的一个不等式及其应用

本文在讨论空间极值距离的基础上,建立了一个关于极值面积的不等式,并由此建立了关于空间K—Q·C映照的一个偏差定理。所得的结果可以看做Ahlfors关于平面相应结果在空间中的推广形式。     

关于闭集的距离及分离性的讨论

章主要指出[1]中一种不确切的说法，并就R^D中闭集的距离及分离分有界和无界情形进行了讨论，同时给出了较直观的证明。     

弹性支座连续墙梁的有限元分析研究

针对连续墙梁编制了专用的有限元法分析程序。通过大量的计算分析，得到了系列结果，研究表明，支座刚度对墙梁的应力分布影响很大，对于支座刚度较柔的墙梁，会明显出现荷载向边支座转移的跨越作用。     

龙头锰矿缓倾斜多层邻近薄矿体采矿方法试验研究

本文根据龙头锰矿试验矿块的地质条件和试采一年多以来的实测数据,以及室内相似材料模拟试验结果,分析研究缓倾斜多层邻近薄矿体的开采方法。研究表明,矿层群的开采,特别是近距、低品位矿层群的开采,多以分采为宜;只要合理选择凿岩爆破参数,和采取正确的台阶形式,能安全回采多层矿体而又不破坏厚度仅为2.7～2.9米的隔层。     

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.     

己知基圆半径求解凸轮机构最佳中心距的解析方法

从摆动从动杆平面凸轮机构的类速度图出发，对最佳中心距ａ＊的客观存在性给予了清晰、直观的几何解释和论证，并由此建立起了求解最佳中心距ａ＊的解析法。     

New weighting factors assignment of evidence theorybased one vidence distance

1.INTRODUCTION Dempster Shafertheoryiswidelyusedinmanyfields suchasinformationfusionanddecision making[1,2].Anditisaverysimpleandstraightforwardwayofex tendingclassicalprobabilitytheory.However,Demp ster’scombinationoperatorisapoorsolutionforthe managementoftheconflictbetweenthevariousinfor mationsourcesatthenormalizationstep.Severalau thorshavecriticizeditandsomehaveproposedother solutions[3,4].InRef.[4],Lefevrehaspointedout thatthecoreofalotofmodifiedmethodistheassign mentoftheconfli…     

女生800米跑教学新尝试

针对女生800米跑教学中普遍存在的问题,采取了一系列方法措施,特别是将已往的集中考试划分为阶段性测验,并在两个女生班进行了对比实验,成绩按统计学原理处理,证明了该措施的有效性。     

面向农民的现代远程教育学习测评改革初探——以教育部“一村一名大学生计划”为例

通过现代远程教育手段开展面向农民的学历教育学习测评多沿用普通高校的学习测评体系,存在测评理念陈旧、方向偏差,主体单一、手段落后,注重结果评价、忽略过程评价等问题;需从加大形成性考核和开卷考试比例、注重过程和能力测评,建设网络题库、促进学测评一体化,实时推出预约考试、满足多样化需求等几个方面进行改革和探索,为学生提供灵活多样的学习测评服务.