缺陷交互作用对陶瓷半导体导电性能的影响

本文借助于缺陷化学反应过程，分析了陶瓷半导体内缺陷间的交互作用，得到了陶瓷半导体实验研究的三个重要启示：（1）强还原（或氧化）或施主（或受主）掺杂对同一样品不能同时起到最佳效果；（2）本征原子空位对施主或受主的补偿导致电导率的非线性增长；（3）缺陷的缔合降低了半导化杂质的有效浓度，从而使电导性能发生异常变化。     

Automated Support for Building and Extending Expert Models

Building a knowledge-based system is like developing a scientific theory. Although a knowledge base does not constitute a theory of some natural phenomenon, it does represent a theory of how a class of professionals approaches an application task. As when scientists develop a natural theory, builders of expert systems first must formulate a model of the behavior that they wish to understand and then must corroborate and extend that model with the aid of specific examples. Thus there are two interrelated phases of knowledge-base construction: (1) model building and (2) model extension. Computer-based tools can assist developers with both phases of the knowledge-acquisition process. Workers in the area of knowledge acquisition have developed computer-based tools that emphasize either the building of new models or the extension of existing models. The PROTÉGÉ knowledge-acquisition system addresses these two activities individually and facilitates the construction of expert systems when the same general model can be applied to a variety of application tasks.     

High temperature low cycle fatigue

Fatigue at high temperature is a complex phenomenon as it is influenced by a number of time-dependent processes which become important at elevated temperatures. These processes include creep, oxidation, phase instabilities and dynamic strain ageing (DSA), acting either independently or synergistically influence fatigue behaviour, often lowering the fatigue life. Current design approaches employ linear summation of fatigue and creep damage with suitable factors on permissible damage to take care of uncertainties in interaction between cyclic and time-dependent processes. It is, therefore, important to develop a deeper understanding of the processes that occur during high temperature fatigue so that realistic life predictions could be made. Results on the high temperature fatigue behaviour of austenitic stainless steels, ferritic steels and nickel base alloys are presented here. The important mechanisms of interaction of high temperature time-dependent processes with fatigue under various conditions are discussed in detail. Emphasis is placed on cyclic stress response, fatigue life, deformation substructure and fracture behaviour. This is followed by a review of important life prediction techniques under combined creep-fatigue loading conditions. Life prediction techniques considered here include linear damage summation, strain range partitioning, ductility exhaustion approach, frequency modified and frequency separation methods, techniques based on hysteresis energy and damage rate models, and methods based on crack-cavitation interation models.     

严格环境管理提高环境意识

环境伴随着经济的发展越来越体现了它的重要性,全社会应重视环境、保护环境,以预防为主,加强综合治理,使我们的天更蓝、水更净、草更绿,到处充满着春的意境.     

A simple correlation for estimating viscosities of solutions of salts in aqueous,non-aqueous and mixed solvents applicable to high concentration,temperature and pressure

A new correlation is proposed to correlate the viscosities of salt solutions in aqueous, non-aqueous solvents and their mixtures. The correlation involves two parameters i.e. solvation number and ion-solvent interaction coefficient, which are well-documented quantities in the literature. The proposed correlation has been examined on the experimental viscosity data of salt solutions in aqueous, non-aqueous and their mixtures up to 473 K and 31 MPa pressure. The salts with various ionic charges were employed for testing the proposed correlation. Several non-aqueous solvents like dimethyl sulphoxide, alcohols and formamide were included for the data regression. The viscosities of these solutions can be correlated to within 0.7%.     

地基基础与上部结构共同作用和结构次生应力问题

本文考虑到上部结构与地基基础共同作用的事实,着重分析上部结构参与共同作用导致的内力重分布——次生应力问题。通过多个理论与实验的结果,对不同地基和基础条件下的次生应力进行了定量分析,探讨了造成次生应力的各种因素以及对建筑结构带来的危害。     

离聚物对PET／LDPE共混物的结构与性能研究

用双螺杆挤出机反应性挤出的方法合成了低密度聚乙烯接枝马来酸镧（ＬＤＰＥ－ｇ－ＭＡＬａ）离聚物。与其它方法相比，该法具有工艺简单，易于工业化生产的特点。我们将离聚物与ＰＥＴ，ＬＤＰＥ在双螺杆挤出机上熔融共混挤出，并用注射成型机制备标准样条，对共混物力学性能进行了测试，发现离聚物有显著的增韧效果，另外，通过ＩＲ，ＤＳＣ，溶解性实验，分子量的测定等还考察了离聚物对ＰＥＴ／ＬＤＰＥ共混体系的结构影响。     

新媒体时代的物联网信息设计与展望

在互联网发展的基础上,物联网可将信息的交流与沟通扩展到任何物体与物体之间,故其将成为新媒体时代改变人类生活的新变量。在探索智能化信息交互与设计的过程中,文章紧跟物联网的发展趋势,不断思索物联网的崛起给新媒体时代的文化、生产与生活带来的需求、挑战与可能性,同时指出了在这样的背景下,物联网这个新媒体时代的新形势对信息设计所带来的新启示。     

基于WebGIS的田间环境监测系统平台的设计与实现

为了实现田间环境信息的可视化查询分析与统计,本文借助于无线传感网络和GPRS通信网络硬件平台以及TopMap软件平台,开发了基于WebGIS的田间环境监测系统。该系统采用了C/S与B/S模式相结合的运行体系结构,ASP.NET为前台开发工具,SQL SERVER2005为后台数据库,TopMap World 6为WebGIS开发平台。系统实现了田间环境信息的动态交互、实时更新以及基于地图的田间环境信息空间查询、统计分析和生成报表等功能。     

基于交互事件流模型的GUI测试用例生成

根据GUI基于事件驱动的特点,对事件流思想在GUI测试中的应用进行研究。针对事件流模型对GUI事件之间的关系描述过于薄弱,生成大量冗余测试用例的问题,在事件流模型中加入用来描述事件间交互关系的信息。同时指出事件交互的本质是事件处理程序之间的变量共享和消息传递。最后给出生成有效交互测试用例的具体算法,并在实例中验证了其有效性。