嵌入式Linux下AD7490驱动的实现

用AD7490对s3c2440进行了扩展,提高其数模转换精度。介绍了嵌入式Linux操作系统下AD7490驱动程序的开发原理及流程,并编写测试程序测试其功能,对于基于Linux的嵌入式系统中小型外设的开发具有借鉴意义。     

基于C／S与B／S架构的IM软件的研究与分析

IM软件是当今以Internet网络为基础的实时通信系统,在实现上主要基于两种架构,分别是基于C／S架构和B／S架构的。基于C／S架构的IM软件主要使用了TCP或UDP协议、P2P~Socket等技术,实现起来较容易,但是用户需要自己安装客户端软件;基于B／S架构的IM软件主要应用了Ajax、ServerPush、服务器轮询等技术,实现起来比较复杂,但是用户不需要安装客户端软件,只需通过浏览器即可实现网上聊天功能。     

UHV／CVD生长SiGe／Si材料分析及应用研究

以Si2H6和GeH4为生长气源,采用UHV／CVD系统在Si（100）衬底上生长了Sil—xGex合金和Sil—xGex／Si多量子阱结构。采用X射线双晶衍射仪、扫描电子显微镜和原子力显微镜等仪器设备对样品的组份、界面和表面形貌等晶体质量进行了研究。SiGe合金中Si和Ge摩尔分数的比值随着Si2H6和GeH4流量比的增加按比例线性增加,比例因子为2．57。生长的Si0．88Ge0．12合金样品的界面清晰,表面平整,平均粗糙度仅为0．4nm,位错密度低于104／cm2。六周期Si0．88Ge0．12／Si多量子阱的X射线双晶衍射摇摆曲线中存在多级卫星峰和Pendellosung条纹。这些结果表明SiGe合金和SiGe／Si多量子阱均具有很好的晶体质量。     

陶瓷外语复合型人才培养模式探究

景德镇是闻名世界的瓷都,拥有悠久灿烂的陶瓷文化历史。鄱阳湖生态经济区建设这一国家战略的确立为景德镇带来了新的机遇,同时江西省政府和景德镇市政府都强调在生态区建设中景德镇应突出优势,突出陶瓷历史文化特色。随着生态经济区战略的全面实施,景德镇对外经贸、文化交流活动将日趋频繁,且范围将逐渐扩大,地方高校应该肩负重任,力图培养和造就一大批高素质的,既掌握外语,又具有专业技术知识,熟悉国内外经贸、法律和国际规则,以及陶瓷历史文化的复合型人才。     

Field dependence/independence cognitive style and problem posing: an investigation with sixth grade students

Field dependence/independence cognitive style was found to relate to general academic achievement and specific areas of mathematics; in the majority of studies, field-independent students were found to be superior to field-dependent students. The present study investigated the relationship between field dependence/independence cognitive style and problem-posing ability among sixth grade students. The 94 students’ sample was clustered into three groups, according to the cognitive-style field dependence/independence (field dependents, field mixed and field independents). The results suggest that field-independent participants outperformed field-mixed and field-dependent ones in both problem-posing ability and the complexity of the problems posed. It was also found that the content of the task influenced the differences between the three groups of students as regards the ability in problem posing and the complexity of the problems posed; while in the first (informal context), second and fourth task differences were found between the groups, in the third task (formal context), no differences were evident. The results are interpreted in consideration to the relevant literature findings. Some educational implications are discussed and directions for future research are drawn.     

基于网络技术的虚拟课堂教学理念与策略

培养学生自主探究学习和网上学习的能力是现代教育的重要研究课题。本文提出基于网络技术的虚拟课堂教学理念、模式与策略,目的是改变原有陈旧的教学模式,创设适合中等职业学校特点的教学环境,更好地培养适应社会需求的高技能型人才。     

高职院校全程就业指导模式下的就业指导队伍建设

以就业为导向的高职教育要求将就业指导贯穿于高职教育的全过程,为此,必须加强就业指导队伍建设。针对目前高职院校就业指导队伍的现状,文章提出了高职院校要实行全程全员就业指导,并从保证数量、提高质量、改善待遇、规范考核等方面探讨了就业指导队伍建设的途径。     

泛读教学中话语分析模式的构建

以话语分析理论为依据,在分析了阅读过程中的话语分析层次的基础上,在英语专业泛读课程教学过程中,从训练阅读技能,建构文章框架,分析情感意图,提高阅读速度这四个方面来进行构建话语分析模式。并通过实证研究检验其有效性。     

Assessing Model Similarity in Structural Equation Modeling

Two models can be nonequivalent, but fit very similarly across a wide range of data sets. These near-equivalent models, like equivalent models, should be considered rival explanations for results of a study if they represent plausible explanations for the phenomenon of interest. Prior to conducting a study, researchers should evaluate plausible models that are alternatives to those hypothesized to evaluate whether they are near-equivalent or equivalent and, in so doing, address the adequacy of the study’s methodology. To assess the extent to which alternative models for a study are empirically distinguishable, we propose 5 indexes that quantify the degree of similarity in fit between 2 models across a specified universe of data sets. These indexes compare either the maximum likelihood fit function values or the residual covariance matrices of models. Illustrations are provided to support interpretations of these similarity indexes.     

Extension for organic agriculture: a comparative study between Baden-Württemberg,Germany and Crete,Greece

Purpose: The aim of this paper is to compare the extension services offered in the field of organic agriculture (OA) in Baden-Württemberg (BW), Germany and Crete, Greece.

Design/methodology approach: 16 in-depth interviews, 10 in BW and 6 in Crete, were carried out with representatives of OA extension providers; interviews were qualitatively analyzed and overall results compared between the two areas.

Findings: The structure along with extensionists' capacities and methods employed are rich, appropriate, and well functioning in BW. On the contrary, poor structure, lack of networking and facilitation in Crete jeopardizes extension performance and impact. Practical implications: Contrary to BW, the situation in Grete does not allow for much optimism concerning the successful development of OA and the implementation of European Innovation Partnerships.

Theoretical implications: Further elaboration of the characteristics of extension/advisory services and their interlinkages, including the role of the state in facilitating pluralistic services, is needed.

Originality/value: The paper demonstrates the importance of the structure of extension services and the central facilitation role of the state; furthermore, the interdependency of structure, capacity and the methods employed is demonstrated which, in turn, influences extension performance and impact especially networking and facilitation for social learning and innovation co-creation.