用蒙特-卡罗方法模拟质子X荧光分析中的荧光增强因子

本文用蒙特-卡罗方法模拟质子激发X荧光分析中的一次和二次荧光强度,从而得到荧光增强因子。文中利用模拟计算程序,在改变入射质子能量、入射角、x射线出射角及分析样品的成分和含量的条件下,分别计算了荧光增强因子。此外,还计算了质子激发标准合金钢样品的荧光增强因子,得到的     

A NEW POLYMER-BOUND 1,2-DIOL AS A PROTECTING AGENT FOR SYMMETRICAL DIALDEHYDE

A novel polymer-bound 1,2-diol, 3-polystyrylsulfonyl-1,2-propanediol (6) had been prepared by the reaction of sodium polystyrylsulfinate with allyl bromide, followed by oxidation and. hydrolysis or directly with 3-chloro-1,2-propanediol in the presence of a phase transfer catalyst, n-tetrabutylammonium iodide. The capacity of resin 6 for terephthaidehyde reached 1.43 mmol/g. The aldehydic groups attached to polymer 6 reacted with hydroxylamine hydrochloride or reduced by sodium borohydride giving p-formylbenzaldoxime (yield: 89%)and p-formyl-benzalcohol (yield: 734%), respectively. The high yields of these polymer-supported reactions showed that the polymer 6 possessed the effective isolation of its reactive sites.     

对称常微分算子的两种自伴延拓形式之间的联系

建立了对称常微分算子von N eum ann自伴延拓与以边条件形式表达的自伴延拓之间的对应关系,给出了相互转换的方法.     

Some studies on mathematical models for general elastic multi-structures

The aim of this paper is to study the static problem about a general elastic multi-structure composed of an arbitrary number of elastic bodies, plates and rods. The mathematical model is derived by the variational principle and the principle of virtual work in a vector way. The unique solvability of the resulting problem is proved by the Lax-Milgram lemma after the presentation of a generalized Korn's inequality on general elastic multi-structures. The equilibrium equations are obtained rigorously by only assuming some reasonable regularity of the solution. An important identity is also given which is essential in the finite element analysis for the problem.     

网站用户登录信息挖掘特征规则

本文首先研究了基本的面向属性归纳，提出了从网站用户登录信息中挖掘用户特征规则的思路。问题从解决多属性归纳着手，特点是首先建立概念树，然后用条件属性组合与约束的方法进行挖掘。实验表明，本文设计的模型能客观地描述客户行为，为从Web信息挖掘客户特征规则提出了一条有效的途径。     

基于约束放松的电子商务协同谈判模型

在众多的自动谈判模式中，协同谈判是一种新型的多线程谈判形式。文章分析了面向电子商务的协同谈判中的冲突问题，提出了解决谈判冲突的方法——满意度函数法。该方法在谈判模型中用约束网来表示谈判中的变量和约束关系，通过约束放松来解决谈判中的冲突。作者在对约束及约束网进行详细分析的基础上设计了约束传播算法，用它来求解约束网问题。文章通过实例验证了提出的论点和方法的正确性。采用这种基于约束放松的协同谈判模型可以有效地解决谈判中的冲突，提高谈判的效率。该方法的应用可为解决多个谈判的组合问题提供一种新的思路。     

完全3-部图K_(1，10，n)的交叉数

在上世纪五十年代初,Zarankiewicz猜想完全2-部图Km,m(m≤n)的交叉数为[m/2][m-1/2][n/2][n-1/2](对任意实数x,[x]表示不超过x的最大整数),目前只证明了当m ≤ 6时,Zarankiewicz猜想是正确的.假定Zarankiewicz猜想对m=11的情形成立,本文确定完全3-部图K1,10,n的交叉数.     

褪色光度法测定微量硫化物的研究

根据Ｓ＾２－对４－（对磺酸基苯基）－卟啉（ＴＳＰＰ）与铅显色反应的褪色干扰作用，建立了一种测定Ｓ＾２－的新方法，该方法对Ｓ＾２－的检出限为１０μｇ／Ｌ，选择性较好，用于含硫废水中痕量Ｓ＾２－的测定，结果令人满意。     

Enantioselective Alkynylzinc Addition to Carbonyl Compounds by Tf-based Sulfamide-amine Alcohol Catalysis

The new Tf‐based sulfamide‐amine alcohol 3a was found to be very effective in catalyzing the enantioselective alkynylzinc addition to both aromatic aldehydes and unactivated aromatic ketones without using another metal species under mild condition, providing up to 92% ee and 90% ee for aldehydes and ketones, respectively.