高校课堂教学质量结构方程模型构建与应用——教师评价的视角

将结构方程模型方法用于高校课堂教学质量研究,可以借助观测模型和结构模型来探索潜变量及其相互间的因果关系。基于教师评价视角,对某高等学校课堂教学质量进行调查,对构成课堂教学质量及其因果变量的相互关系进行分析和模型的路径设计,构建了高校课堂教学质量模型,并借助LISREL8.7软件进行了分析,证实模型有较好的拟合度。     

中立型方程正解的存在性

本文用初等方法得到了一类中立型微分方程正解存在的充要条件.     

The relationship between teacher’s autonomy support and students’ autonomy and vitality

Abstract

Within education, some teachers’ interpretation of professionalism emphasizes conformity to the perceived norms of collective associations. Unprofessional behaviour, often equated with ‘unethical’ behaviour, is seen by many to be that which threatens solidarity and loyalty to colleagues. Informal norms typified by casual collegial relations as well as more formal attachments to organized unions or teachers’ federations exert a significant influence on individuals’ behaviour within the group. Professional ethics, in this sense, become concerned primarily with how one relates to colleagues rather than how one fulfils moral responsibilities to students. Qualitative findings from interviews with elementary and secondary school teachers suggest that, as a result of an ethic of collegial loyalty, some teachers experience personal moral and ethical dilemmas that they find difficult to resolve. Some respondents acknowledged that this can enable serious situations to be ignored or ‘covered up’. This paper examines some of the tensions and dilemmas experienced by teachers and raises questions about the ethical adequacy of defining professionalism in terms of inter‐colleague behaviour.     

论欧盟的兼并救济指南

2008年欧盟委员会发布了关于欧盟兼并条例项下可接受救济的新指南。新指南澄清了当事方在资产剥离中的义务,制定了提交有关救济的信息的格式,并考虑了2005年欧盟委员会兼并救济研究报告的成果。但是,新指南对结构性救济的偏好以及其给予利益方有限的灵活性也反映了其缺陷。我国的兼并救济制度已初步建立起来,但仍需要进一步完善。欧盟新指南为我国兼并救济制度的完善提供了借鉴。     

Cognitive load in algebra: element interactivity in solving equations

Central to equation solving is the maintenance of equivalence on both sides of the equation. However, when the process involves an interaction of multiple elements, solving an equation can impose a high cognitive load. The balance method requires operations on both sides of the equation, whereas the inverse method involves operations on one side only. In an experiment, middle school students (N?=?71) were randomly assigned to the balance and inverse methods to complete a pre-test, an acquisition phase and a post-test. Pre-test and post-test comparisons found that the inverse group outperformed the balance group for those equations that involved high element interactivity. Instructional efficiency measures further confirmed that the balance method imposed higher cognitive load. The inverse method was capable of reducing cognitive load due to the interacting elements.     

粘弹性阻尼对非线性弹性杆内纵向应变孤波运动的影响

本文采用基于KdV方程的守恒量建立起来的孤波参数的演化方程组,重新研究了粘弹性阻尼对非线性弹性杆内纵向应变孤波运动的影响,得到了孤波参数的演化规律。结果表明,粘弹性阻尼使孤波逐渐变矮、增宽、速度减慢,最后导致孤波的消失。     

具有正负系数差分方程解的振动性

考虑一类具有正负系数的差分方程,获得它的所有解振动的充分条件．     

Decomposing trait and state variability in general and specific subjective task value beliefs

Expectancy-value researchers have theorized about the extent to which subjective task value components are more trait-like or more state-like. Using a bifactor representation of subjective task value data, the current study aimed to examine the degree of trait-state variation in general subjective task value, specific attainment value, specific intrinsic value, and specific utility value. The relations of both between and within components of the subjective task value constructs with academic self-efficacy beliefs were also examined. Results indicate that, in an undergraduate life science learning context (n = 169), the general subjective task value factor was the most trait-like of the subjective task value constructs. With respect to specific value beliefs, attainment value was composed of nearly equal amounts of trait and state variation, intrinsic value was composed of the largest amount of trait variation, and utility value exhibited the most state-like variation. Additionally, findings suggest that trait-like and state-like general subjective task value, trait-like specific intrinsic value, and state-like attainment value were positively associated with self-efficacy. Finally, we propose a model of trait- state dynamics in subjective task value.     

PAA@Co复合薄膜的制备及光学特性研究

在磷酸电解液中,利用一次阳极氧化工艺成功的制备了具有结构色的多孔氧化铝薄膜。采用交流电沉积方法在氧化铝薄膜的孔洞中沉积金属Co纳米线,得到了高机械强度且具有高饱和度结构色的复合薄膜。控制氧化时间,可以调控复合薄膜结构色的颜色。采用遮挡法,结合多次电沉积工艺,成功的制备出具有彩色图案的复合薄膜。理论分析了薄膜结构色的变化与其微观结构的关系,结果显示,理论分析和实验结果相吻合。     

一类广义Liénard方程周期解的不存在性

研究一类广义Liénard方程周期解的不存在性,给出了其周期解不存在的两个充分条件,用极限集理论与Poincaré切性曲线法证明了所得结果。