酚醛树脂及其复合材料研究现状

本文介绍了酚醛树脂及其复合材料的性能、市场概况以及国内外的研究情况和发展状况，并对今后的研究发展趋势进行了展望。     

Perspective on Materials Genome~

The author’s perspective on Materials Genome is presented in this paper through several related projects.Current thermodynamic and kinetic databases of multicomponent materials consist of Gibbs energy functions and atomic mobility of individual phases as functions of temperature,composition,and sometimes pressure,i.e.,with the individual phases based on crystal structures as the genome(building blocks)of materials.It is articulated that if an individual phase has its internal configurations,such as magnetic spin configurations and ferroelectric polarization,change significantly with respect to temperature,stress,and magnetic and electric fields,then those individual configurations instead should be considered as the genome of the individual phase.The‘‘mutation’’of an individual phase is governed by the entropy of mixing among the individual stable and metastable configurations,named as microstate configurational entropy,and responsible to anomalies in individual phases.Our ability to tailor the properties of those individual configurations as a function of compositions is the key for the design of materials.     

Microstructure-based multiphysics modeling for semiconductor integration and packaging

Semiconductor technology and packaging is advancing rapidly toward system integration where the packaging is co-designed and co-manufactured along with the wafer fabrication. However, materials issues, in par- ticular the mesoscale microstructure, have to date been excluded from the integrated product design cycle of electronic packaging due to the myriad of materials used and the complex nature of the material phenomena that require a multiphysics approach to describe. In the context of the materials genome initiative, we present an overview of a series of studies that aim to establish the linkages between the material microstructure and its responses by considering the multiple perspectives of the various mul- tiphysics fields. The microstructure was predicted using thermodynamic calculations, sharp interface kinetic models, phase field, and phase field crystal modeling techniques. Based on the predicted mesoscale microstruc- ture, linear elastic mechanical analyses and electromigra- tion simulations on the ultrafine interconnects were performed. The microstructural index extracted by a method based on singular value decomposition exhibits a monotonous decrease with an increase in the interconnect size. An artificial neural network-based fitting revealed a nonlinear relationship between the microstructure index and the average yon Mises stress in the ultrafine interconnects. Future work to address the randomness of microstructure and the resulting scatter in the reliability is discussed in this study.     

基于CASE推理的排样算法

优化排料的目的是根据给定待排样品对板材进行最优切割使得板材的利用率尽可能的高。本文提出一种基于ＣＡＳＥ推理的优化排样算法，基本思想是对每块板材的布局都进行ＣＡＳＥ推理，选取ＣＡＳＥ中的最佳布局，若没有相应的ＣＡＳＥ、则调用启发式算法搜索。算法不但避免了组合爆炸，加快了排料速度，而且具有满意的材料利用率。实际应用表明算法是成功的。     

“材料科学基础”课程的考核体系改革研究

讨论了"材料科学基础"课程考核存在的问题,对该课程考核体系进行考试形式多样化、过程化、理论知识和实践创新能力并重的改革研究,建立考核档案,并提供参考范本;新的考核体系有利于学生对理论知识的掌握,提高了学生应用理论知识分析和解决实际工程问题的能力,培养了学生的创新意识,使成绩评定更为科学合理和有效.     

磷石膏中污染物可溶磷的溶出特性实验研究

试验研究了磷石膏废渣中污染物可溶磷的淋溶、浸泡特性,考察了淋溶介质、浸泡时间、搅拌时间及浸泡温度等因素对可溶磷释放行为的影响。结果表明,在一系列的实验条件下,磷石膏中可溶磷均能被有效释放出来,说明磷石膏的长期堆放处置可对水环境造成严重的污染威胁。研究结果对磷石膏渣场的设计、环境影响评价及其污染防治有一定的参考价值。     

图书馆“外教中心”学科化知识服务开展研究

学科化知识服务是从学科角度出发建构的知识服务模式，是高校图书馆知识服务开展的现实要求。“外教中心”是国内以教学服务为关注重点的有学科针对性的国外教学资源、信息保障平台。本文以吉林大学图书馆外教中心为例，探讨图书馆外教中心知识服务开展的需求、服务体系、实施保障问题，为外教中心工作的开展提出相关建议。     

不确定环境下的战场物资供应任务规划

针对执行战场物资供应任务之前,不确定环境下的战场物资供应任务规划问题进行研究,并建立相应的不确定规划模型,引入一种新的启发式算法——蜂群算法,对其进行改进,构建适于解决战场物资供应任务规划问题的算法,并通过与现有算法进行性能比较,验证其有效性。最后,通过一个存在13个供应任务点的应用实例,验证提出的模型及算法的有效性。结果表明,不确定环境下得到的最佳方案更符合实际。     

饱和土体一维固结方程的稳定性分析

根据分布参数系统控制理论和半群理论的研究方法和成果对饱和土体在附加应力作用下的一维固结方程的稳定性进行了分析证明，从理论上给出了土体固结沉降的渐近稳定性结果。     

贮热材料四氯合金属酸(Ⅱ)二烷基铵固-固相变动力学

热致相变贮热材料四卤合金属酸(Ⅱ)二烷基铵具有层状钙钛矿结构,通过晶型有序-无序转变能可逆地固-固相变贮热. 合成了两种材料四氯合锰酸十二铵n-(C12H25NH3)2MnCl4和四氯合锰酸十四铵n-(C14H29NH3)2MnCl4,并在两种材料的乙醇溶液中结晶出一系列二元混合体系. 对纯组分及各个二元体系利用差示扫描量热(DSC)测定了热分析曲线,采用Kissinger和Ozawa两种动力学模型研究了材料的非等温固-固相变动力学,计算了固-固相变过程的活化能和反应级数. 两种方法的计算结果相一致. 随着C12Mn质量分数的增加,二元体系表观活化能Ea值呈波动变化. CnMn及二元体系的反应级数均接近于1.