强磁场下液态金属在竖直平板外的自由对流换热

托克马克装置中面向等离子体部件在不同的位置存在很大的温差,导致面向等离子体部件表面液态金属产生自由对流。以此为背景,实验研究液态金属受横向磁场影响下竖直壁面上的自由对流换热规律。实验采用K型热电偶测量环境与壁面两侧的温度,利用多普勒超声波测速仪测量壁面上的液态金属速度,分析不同磁场强度和加热热流密度条件对竖直平板外表面的流动与换热影响规律。研究表明：竖直平板的局部换热系数与特征长度成反比,即距加热平板起始段越远换热越弱,同时增强加热功率使表面换热系数增加。在强磁场条件下,壁面边界层的流动与换热均普遍被抑制;但是在弱磁场下,增加磁场会强化平板表面的自由对流与换热,根据实验结果发现该转折点出现在磁相互作用数为1~4的范围。     

论民国学生装的文化特点及其当代价值

民国学生装以其独特的服饰形态和服饰文化成就了中国校服史上影响最为深刻的一次变革,至今依然感动着世人,它的存在对当代大学校服文化建设有着积极的借鉴作用。文章从介绍民国学生装产生的时代背景入手,通过对男女学生装不同形态和款式的介绍,揭示了民国学生装所隐喻的独特文化精髓,并提出了民国学生装对当代大学生服饰文化建设的借鉴意义。     

改善中跑(1500米)教学的试验

在中跑的教学中,运用测心率,按规定的时间匀速跑,逐渐加长跑的距离,以提高学生的兴趣,消除怕跑的心理,从而获得较好的教学效果。在对所任新生班的龙套1500米教学试验后,取得较为满意的结果,证明试验方法是可行的,中跑教学是可以使学生变被动为主动,使学生掌握一些科学的方法,同时也使学生的耐力素质得到提高。     

Helping the “Non-Law” Librarian Understand Law Library Requirements for Interlibrary Loan Copy Requests

Law library interlibrary loan departments must work under the constraints of The Bluebook Uniform System of Citation when requesting materials for cite checkers. This article discusses the issues that arise during the interlibrary loan process for requesting sources cited in legal articles.     

论阎连科《日光流年》里的生与死

阎连科的《日光流年》讲述的是在耙耧山脉深处的几乎与外界隔绝的三姓村的故事。三姓村村民全都活不过四十岁,这也注定了死亡与生育生活生存的较量。历届村长带领村民与死亡斗争,充满北方人的对“生的坚强”和“死的挣扎”。三姓村村民的“生的坚强”表现在生育、生存和生活三个方面,而“死的挣扎”则表现在死亡的方式、意义和对棺材的重视三个方面。阎连科这种对死亡和生育的变态迷恋正是出于他对生命的热爱与绝望。     

均匀遍历纹理寻址的水面散射图像去雾算法

提出一种基于均匀遍历纹理寻址的水面散射图像去雾算法,构建水面大气散射物理模型,把图像分成天空区域、海面区域和海天交界线区域等三个区域,对海天交界线是海面和天空区域的交界线进行提取,采用Canny边缘检测和Hough直线检测相结合,得到图像的边缘提取结果。采用均匀遍历纹理寻址的方法,计算各直线段的长度找出最长的线段就是海天线,实现对图像场景的恢复,实现图像去雾清晰化处理。仿真结果表明,该算法去雾效果较好,对于海面浓雾的去雾处理效果明显。研究成果将在复杂天气下成像目标识别等领域具有很好的工程应用价值。     

超磁致伸缩作动器的磁路设计

论述了超磁致伸缩作动器的基本原理,根据三种偏置磁场优缺点,选用增加单独线圈产生偏置磁场。在磁路分析的基础上,采用有限元仿真的方法,分析了不同参数和结构对各个组成部分的磁场影响。     

Indigenous students' persistence in higher education in Australia: contextualising models of change from psychology to understand and aid students' practices at a cultural interface

The need to address the substantial inequities that exist between Indigenous and non-Indigenous Australians in higher education is widely recognised. Those factors that affect the performance of Indigenous students in tertiary education have been reasonably well documented across different institutions, disciplines, and programme levels but there has, to date, been less consideration of the processes by which Indigenous students either persist or desist in higher education. This paper aims to present a conceptual understanding of academic persistence that can inform the delivery of tailored academic support interventions to Indigenous students who are at high risk of leaving higher education.     

Mastery Motivation in Children with Intellectual Disability: Is there Evidence for a Down Syndrome Behavioural Phenotype?

The main purpose of the current study was to provide empirical evidence to support or refute assumptions of phenotypic deficits in motivation for children with Down syndrome (DS). Children with moderate intellectual disability (MID) associated with etiologies other than DS were recruited in an extension of a previous study that involved children with DS and typically developing children. The participants were 29 children with MID and 33 children with DS who were matched on mental age to 33 typically developing children, aged 3–8 years. Mastery motivation was assessed on task measures of curiosity, preference for challenge and persistence, as well as parental reports. There were no significant group differences on the mastery motivation tasks. Parental ratings of mastery motivation differed, with typically developing children generally being rated more highly than each of the disability groups. The view that motivational deficits are part of the DS behavioural phenotype was not supported.     

一种基于CIEDE2000的烟叶颜色分级方法

烟叶人工分级易受主观因素影响,分级结果存在主观差异性,需要建立与人眼视觉感受相吻合的客观分级方法。本文针对烟叶颜色属性进行分级判断,给出一种基于CIEDE2000的均匀色差颜色分级方法。该方法包含了亮度、色调和饱和度综合色差视觉感受的图像评价标准,将待测烟叶与标准烟叶库中所有标准烟叶分别做色差计算,根据距离准则,寻找与当前待测烟叶色差最小的标准烟叶,同时对这个最小距离进行阈值判定,来确定当前待测烟叶的等级。实验结果表明根据CIEDE2000色差公式的颜色分级方法优于RGB颜色分级方法,与人眼视觉感受更为吻合,为建立烟叶自动分级系统提供了新的依据。