Banach空间中一类广义混合平衡问题系统解的存在性及算法

在实Banach空间中引入和研究了一类新的广义混合平衡问题组.首先考虑了一个辅助混合平衡问题组,通过它与广义混合平衡问题组的等价性,证明了它的解的存在性和唯一性;其次构造了广义混合平衡问题组的近似解的迭代算法.在一定的条件下,证明了由算法生成的迭代序列的强收敛性,这些结果推广并改进了近期的某些结果.     

二元含铜类水滑石催化苯制苯酚反应的研究

采用共沉淀法制备二元含铜类水滑石,并用于苯直接氧化制苯酚反应的催化性能研究。结果表明,当适宜的反应条件为：反应温度65℃、反应时间6h、催化剂用量10mg、溶剂用量15mL、n（C6H6）：n（H2O2）=3：1时,CuA1-IDHs具有最强的催化活性,苯酚收率达3．5％,无副产物,经表征证明产物的存在。     

A dynamic analysis of why learners develop a preference for autonomous learners in computer-mediated communication

A large number of studies in CMC have assessed how social interaction, processes and learning outcomes are intertwined. The present research explores how the degree of self-determination of learners, that is the motivational orientation of a learner, influences the communication and interaction patterns in an online Problem Based Learning environment. Given the complexity of CMC, we expected that autonomous learners would be more willing to contribute to cognitive discourse. In time, we expected that control-oriented learners would develop a preferential attachment to contribute to discourse from autonomous learners. Data were gathered from 37 autonomous and 39 control-oriented learners who posted 1669 messages. Using a dynamic multi-method approach of content analysis of cognitive and social discourse, social network analysis, and measures of academic motivation, we find some preliminary evidence that motivational orientation influences communication and social interaction patterns amongst learners. From the beginning, most control-oriented learners develop a preference to connect to and communicate with autonomous learners, although a separate team-analysis indicates that group dynamics also influence how learners develop connections with other learners in time. Our findings further the understanding of differences found in distance learning courses about participation and drop-out.     

Mixed Mode Latent Class Analysis: An Examination of Fit Index Performance for Classification

This Monte Carlo study examines the performance of fit indices commonly used by applied researchers interested in finite mixture modeling for the purposes of classification. Conditions for the simulation study were selected to reflect conditions found in applied educational and psychological research. The factors included in the investigation were metric level of indicators, sample size, and class prevalence. All models contained a combination of categorical and continuous indicators. All categorical indicators were dichotomous, and continuous indicators were normally distributed. The fit indices examined were Akaike’s information criterion, Bayesian information criterion (BIC), sample size-adjusted Bayesian information criterion (SSBIC), integrated classification likelihood criterion with Bayesian-type approximation, and Lo–Mendell–Rubin likelihood ratio test. Overall, SSBIC tended to identify the correct solution with higher frequency than other indices. BIC tended to identify the correct solution with higher frequency than the other indices in models with more continuous than categorical indicators, or when rare classes were absent.     

基于Web的科研信息管理信息系统

开发一个基于C/S和B/S两种模式架构的高校科研管理信息系统,主要采用ASP.NET、PowerBuilder、C#、SQL Server 2000数据库等相关技术作为项目实施的技术支撑,并运用软件工程的方法给出了系统的模块设计流程,利用现有"一卡通"系统的统一身份认证平台完成用户认证,保证了系统的安全性。通过系统应用效果分析得出该系统,对于高校的网络化科研管理具有一定的理论意义和实践价值。     

基于复合指纹识别技术的西藏错那湖东岸风沙来源的定量化分析

本文通过对西藏错那湖地区基岩、第四纪沉积和风沙堆积的填图和采样,测量其化学元素成分,应用复合指纹识别技术定量化查明风沙沉积的物源组合及其贡献百分比,从而为错那湖地区更科学地进行沙漠化防治提供数据支撑和实践指导。分析结果表明：①使用复合指纹识别技术定量查明了错那湖东侧巴索曲、龙庆南沟和桑曲3个风沙分布区的物质来源,风沙主要来源于湖的东岸和北岸;②错那湖地区风沙的物质来源差异很大,以东岸贡献为主,对3个风沙区的贡献率分别为82.3%、60.4%和10.1%,呈现出自南向北逐渐减小的趋势;③结合青藏铁路分布可知,东岸物源对铁路的威胁最大,北岸物源仅对铁路以东到山坡的狭长区域有一些影响。夏季高温多雨期,巴索曲、龙庆南沟和桑曲3条河流将中上游的冻融、风化形成的细颗粒物质通过流水作用源源不断地输送到湖滨区域,来年冬春季干燥大风期时,这些暴露的细颗粒物质被大风输送到东侧形成风沙区,基于这一作用机理的认识,认为本地区风沙对铁路的威胁是持续的、长期存在的。因此,在铁路西侧防沙措施的基础上,还应加强铁路东侧的风沙的治理,并在铁路和山坡之间的狭长地带也设置一些防沙设施。     

家庭农场绿色防控技术政策偏好与补偿意愿

病虫害绿色防控技术对实现化学农药减量控害和促进农业可持发展具有重要作用。本文以黄淮海平原的371户家庭农场为例,运用选择实验法,在通过事前“暖身”和“披露”来消除排序效应,并采用推断性属性非参与方法对家庭农场忽略的属性进行信息处理的基础上,构建分层贝叶斯广义混合Logit模型,探讨家庭农场对绿色防控技术推广政策的偏好,并估计家庭农场绿色防控技术采纳的平均补偿意愿及各政策属性边际补偿意愿,以便为政府制定更具针对性和可操作性的推广政策,以及合理的补偿金额提供参考依据。研究发现：家庭农场尤其偏好政府对其进行销售、资金和技术支持;在面临相同的推广政策属性组合时,农场主务农年限越短、受教育水平越高、资产状况越充裕和劳动力数量越少的家庭农场,其绿色防控覆盖率增加的可能性越大;家庭农场的平均补偿意愿为99.66元/亩,各政策属性边际补偿意愿从高到低依次为销售支持（14.75元/亩）、信贷支持（13.75元/亩）、技术支持（12.21元/亩）和保险支持（0.27元/亩）。因此,应将推广政策聚焦于销售、资金和技术3个方面;以农场主务农年限短、受教育水平高、资产状况充裕、劳动力数量少的家庭农场为重点推广对象;结合地区各政策支持力度的变化,灵活地调整具体补贴金额。     

Students’ perceptions of an interdisciplinary global study tour: uncovering inexplicit employability skills

ABSTRACT

For higher education graduates to be effective in the workplace, they require strong technical skills and the capability to operate across diverse knowledge landscapes to solve real world problems. At an Australian university, an interdisciplinary, short-term study tour programme was utilised to enhance students’ inexplicit employability skills with a focus on managing complexity while developing agility and creativity. To investigate the effectiveness of such a programme, we examined students’ perceptions of an interdisciplinary teamwork assessment task that was undertaken in an international context via a study tour model. We achieved this by, first, introducing a purposely designed interdisciplinary teamwork assessment task, which focused on students presenting innovative ideas to peers and industry members. Second, we elicited student responses via a case study approach that incorporated mixed methods, utilising several data collection instruments prior to, during, and after students participated in a study tour. The findings suggest that integrating a purposely designed interdisciplinary teamwork assessment task, via a short-term study tour model, uncovered certain inexplicit employability skills, namely managing complexity, developing agility and creativity. We make specific recommendations to support this insight, contributing to the mobility teaching and learning research field.     

Examining the Library as a Site for Intervention: A Mixed-Methods Case Study Evaluation of the “Innovative Solutions to Homelessness” Project

Abstract

This study examined a project that delivered social work services to homeless individuals. A mixed-methods case study was conducted using quantitative and qualitative data from 93 library employees and the project’s Homelessness Prevention Outreach Worker (HPOW). There was an increase in the number of clients accessing community supports during the project, and the HPOW was integral to the provision of support and resources to homeless individuals. Staff training was associated with significantly greater knowledge, comfort, and skills in working with homeless individuals. These findings can inform the delivery and implementation of similar programs for homeless individuals.     

混业经营的利与弊

尽管我国金融业距离混业经营还有很长的一段路程要走，但是混业经营毕竟已是大势所趋。文章详细阐述混业经营的优势与弊端以及对我国商业银行产生的影响并就此作出适合我国商业银行经营模式的选择。