自相似结构壳模型

为了扩展以简谐振子为基矢的常规壳模型（ＳＭ）计算到晕核，提出了自相似结构壳模型（ＳＳＭ）．通过对简谐振子动能项和势能项的重度规以及单粒子平均场模拟，可以得到ＳＳＭ中的单粒子轨道有态相关的圆频率，在ＳＳＭ中，晕核大的均方根半径、厚的中子皮以及Ｂｏｒｒｏｍｅａｎ晕核和的束缚态性质能够再现出来。     

A model of fads,fashions, and group formation

I develop a model of consumer behavior where agents purchase goods in order to signify personal characteristics. Agents purchase goods in order to imitate agents similar to them and agents they want to emulate. Depending on parameter values of consumer preferences the model generates stable groups, fads, and fashion cycles, or a mixture of both. The model is unique to the economic literature on fads in that the extinction of fads occurs endogenously in the model. © 2004 Wiley Periodicals, Inc. Complexity 9: 51–61, 2004     

光学偏振实验仿真设计

采用计算机工具软件，成功地设计和编制了偏振现象实验的仿真程序，用于计算机辅助教学     

基于语义的软件服务故障自动诊断模型

模仿学习是机器人仿生机制研究的主要内容之一,即通过观察、理解、学习、模仿示教行为实现机器人的仿生特性。基于高斯过程分别表达采集离散示教信号所构成的示教轨迹和含有未知参数策略的模仿轨迹,构建模仿学习方法框架,将概率模型匹配引入到模仿学习中,以KL散度为代价函数比较两种轨迹的概率分布,运用梯度下降法寻求使KL散度最小的最优模仿控制策略,将策略应用于模仿机器人以完成与示教相同的模仿任务。以关节型机器人的机械臂摆动行为模仿为学习任务进行仿真,结果表明基于概率轨迹匹配的模仿学习方法能够实现机械臂摆动行为模仿,学习过程较传统方法简易且学习效果较好。     

隐性技术、贸易溢出和模仿策略

本文构建了一个扩展的南北贸易模型,将北方创新、南方模仿和进口产品隐性技术作为内生变量,分析进口国如何选择模仿策略以最大程度地获得进口产品的内生技术溢出效应.结果表明,进口产品中隐性技术含量会影响南方厂商的模仿策略:进口产品隐性技术含量低时,原始模仿是南方厂商的理性选择;进口产品隐性技术产量较高时,南方厂商的模仿策略取决于模仿的预期边际收益与单位模仿成本的对比关系:模仿的预期边际收益大于单位模仿成本时,内生模仿是南方厂商的最优选择,反之原始模仿.     

An unusual phenomenon observed when anodising CP titanium to produce coloured surfaces for jewellery and other decorative uses

The unpredictability of the evenness of colour developed on titanium surfaces for use in jewellery has led to a research project at Central Saint Martin's College of Art and Design (CSM) to investigate the detailed structure of the thin oxide films that produce the interference colours.In the course of some initial investigations an unusual phenomenon was observed when a specific material was anodised. Examination of the anodised surface by scanning electron microscopy (SEM) showed a profusion of flower-like ‘oxide growths’ developed in random orientations from about 30 V with increasing density up to 110 V.In honour of the late Professor Harvey Flower these features are currently referred to as ‘Flower oxides’ or ‘flowers’.Further work is continuing to clarify the nature of these growth features and their structure and composition.     

Potentiometric determination of silver(I), palladium(II) and gold(III) in mixtures by use of an iodide-selective electrode

Two procedures are proposed for the potentiometric determination of Ag(I), Pd(II) and Au(III) in binary mixtures, by titration with potassium iodide solution, and use of a commercial iodide electrode as sensor. In the first procedure, two aliquots of the mixture are titrated, at pH 2.0 ± 0.2 and 9.0 ± 0.2, adjusted with dilute sulphuric acid and ammonia solution. At pH 2.0, the titrant reacts with both metals, whereas at pH 9.0, Ag(I) is the only reactant. The second procedure utilizes titration of two aliquots of the mixture in the presence and absence of a selective masking agent. The methods have been applied to the determination of these metals in some jewellery alloys.     

Absolutely expedient imitative behavior

This paper analyzes a model of learning by imitation, where besides the decision maker, there is a population of individuals facing the same decision problem. We analyze a property called Absolute Expediency, which requires that the decision makers expected payoff increases from one round to the next for every decision problem and every profile of realized actions taken by the population. We give a simple characterization of the expediency property and show that its basic feature is proportional imitation: the change in the probability attached to the played action is proportional to the difference between the received and the sampled payoff (the sampled payoff plays the role of an aspiration level). Received October 2001     

仿真饰品中邻苯二甲酸酯类增塑剂的含量测定和迁移风险考察

建立了仿真饰品中14种邻苯二甲酸酯类增塑剂的含量和迁移量测定的气相色谱-质谱(GC-MS)检测方法。考察了微波萃取、超声波萃取、快速溶剂萃取和索氏提取4种前处理方法对增塑剂含量测定的影响。在模拟人体温度及汗液环境下,考察了0～168 h内塑料仿真饰品中邻苯二甲酸二丁酯(DBP)、邻苯二甲酸二(2-乙基己基)酯(DEHP)和邻苯二甲酸二辛酯(DOP)3种增塑剂的迁移风险。结果表明微波萃取法的提取效率优于其余3种方法。所建立方法的定量限为5 mg/kg (邻苯二甲酸二异壬酯(DINP)、邻苯二甲酸二异癸酯(DIDP)为25 mg/kg),在0.1～50 mg/L(DINP、DIDP在0.5～250 mg/L)范围内,线性相关系数在0.99以上,在3个添加水平下的回收率在90.95%与98.67%之间。在模拟条件下,DEHP的迁移风险较高,浸泡72 h后约有0.75%溶出,而DBP和DOP的溶出风险较低。该法的灵敏度高、回收率高、选择性好,能满足实际工作的要求。     

气相色谱―质谱法测定仿真饰品中磷酸酯类增塑剂含量

建立了仿真饰品中6种磷酸酯类增塑剂含量的气相色谱―质谱测定法。对提取方法、色谱条件及质谱参数进行了研究。结果表明,采用正己烷/丙酮(体积比1∶1)微波萃取样品35 min可获得良好的提取效果。所建立的微波萃取―气相色谱―质谱法的定量限为1～2.5 mg/kg,在1～2个数量级浓度范围内,线性相关系数R2在0.999以上,在三个添加水平下回收率在86.63%～98.13%之间。对市售9种塑料仿真饰品的测定结果表明磷酸酯的存在风险极低。