一类随机微分效用的风险厌恶性

通过倒向重随机微分方程引入了一类随机微分效用,讨论其风险厌恶性。     

Subordination and superordination properties of multivalent functions defined by certain integral operator

For normalized multivalent functions, we study different applications of the theory of differential subordination and superordination, that are connected to a recent linear operator defined by Liu and Owa.     

基于P（x）-Laplace流的向量值图像恢复模型

提出一种基于变指数型扩散方程的向量值图像（例如RGB图像或多谱图像）恢复模型。在新的模型中,我们利用光滑后向量值图像的几何流形特征来判断图像的真假边缘,利用P（x）-Laplace型扩散系数来控制扩散量和扩散方向。由于扩散系数具有良好的自适应判断边缘能力,新的模型在图像恢复的同时良好地保持了图像边缘。通过数值实验,对比以往的全变差模型,所提模型具有更好的图像恢复效果,明显减少了＂块状＂效应。     

差序格局学术社会中同行评议制度实施之困

在破“五唯”政策背景下,完善同行评议制度对我国教育文化事业高质量内涵式发展具有重要意义。同行评议制度作为一种“舶来品”,在成为我国学术评价制度的重要组成部分之后,其实施原则由西方的“知识本位”转化为我国的“社会本位”。然而,我国学术社会在发展过程中形成了差序格局,具有自我主义和等级差序的特征,表征为师门流派和学术差等现象。在差序格局学术社会中,自我主义导致评议专家产生评议偏好,等级差序阻碍学术新人显露头角,人治社会削弱了评议的规范性,不利于同行评议制度的有效实施,影响着我国教育文化事业的高质量内涵式发展。     

B样条在常微分方程组中的应用

骈条函数在数值逼近中有很广泛的应用.本文主要利用三次B条插值给出了一阶常微分方程组的数值解,给出一个具体的数值例子,通过例子进一步验证了该方法具有较高的精度.     

Examining type I error and power for detection of differential item and testlet functioning

In this study, the effectiveness of detection of differential item functioning (DIF) and testlet DIF using SIBTEST and Poly-SIBTEST were examined in tests composed of testlets. An example using data from a reading comprehension test showed that results from SIBTEST and Poly-SIBTEST were not completely consistent in the detection of DIF and testlet DIF. Results from a simulation study indicated that SIBTEST appeared to maintain type I error control for most conditions, except in some instances in which the magnitude of simulated DIF tended to increase. This same pattern was present for the Poly-SIBTEST results, although Poly-SIBTEST demonstrated markedly less control of type I errors. Type I error control with Poly-SIBTEST was lower for those conditions for which the ability was unmatched to test difficulty. The power results for SIBTEST were not adversely affected, when the size and percent of simulated DIF increased. Although Poly-SIBTEST failed to control type I errors in over 85% of the conditions simulated, in those conditions for which type I error control was maintained, Poly-SIBTEST demonstrated higher power than SIBTEST.     

关于微分形式不变性的应用

微分形式不变性对于隐函数（组）求偏导,无需知道各变量之间的关系,只要把所有变量都看成独立变量来处理,就可以给类似这样的求偏导带来许多方便。此外,微分形式不变性在多元函数求极值上也有应用。     

基于压力的旅游者旅游行为分异特征研究

旅游可以改善人们的生活状态,深入探究旅游与压力的关系,让旅游消费活动成为更直接的解压途径,充分体现旅游的民生意义。湛江市是一个具有多元旅游产品的旅游目的地,可以满足旅游者多种旅游消费需求。通过对湛江主要景区旅游者的抽样调查,采用聚类方法得到不同压力源的旅游者类型,发现不同压力类型旅游者的旅游行为在旅游花费、出游方式、获取信息渠道三个方面表现出明显的分异色彩,在出游目的、目的地类型、旅游住宿、交通工具四个方面的分异不明显。     

Do the rich get richer and the poor poorer?: The effects of an intervention programme on reading in the home and school language in a high poverty multilingual context

There is little research on differential reading performance in multilingual contexts in less than ideal learning conditions. This article reports on a reading intervention project in a poor multilingual primary school in South Africa where reading levels in Northern Sotho (home language) and English (language of schooling) were initially very low amongst Grade 7 learners. The nature of the reading intervention is briefly sketched and the outcomes after three years of implementation presented. Results at the intervention school showed some Matthew effects in both languages. Differential reading performance is discussed in relation to the high poverty and multilingual context of the school. Although this is a single case longitudinal study, implications for reading interventions and classroom instruction are considered in the context of disadvantaged multilingual primary schools.     

学术期刊媒体融合发展的逻辑、模式与实践

【目的】 探索学术期刊内容生产、知识供给、定点推送和差异服务的深度融合之道。【方法】 通过文献研究法、访谈法以及对国内个别学术期刊媒体融合的实践分析,探索学术期刊媒体融合发展的新模式。【结果】 在媒体融合发展逻辑的指导下,学术期刊应积极顺应媒体融合之大势,主动关注领域重点、热点及前沿学术议题,抢占先发优势,积极谋求权威媒体的间接传播,拓宽信息传播渠道,开展多种数据格式的网络出版,实现信息定点推送和差异服务,以建构“学术期刊+移动互联网+服务”的“121”融合模式,构筑“作者—读者—编者”之间无障碍实时交互机制。【结论】 学术期刊媒体融合的“121”模式能够有效推动学术期刊媒体融合进程,实现学术信息的广泛传播。