试论多要素协同提升西安高新区自主创新能力

西安高新区是我国建设世界一流高科技园区的首批六个试点园区之一.在分析西安高新区在自主创新能力建设方面存在不足的基础上,提出了充分发挥企业、政府、大学、科研单位、金融部门及中介服务机构等多要素的协同作用,共同提升西安高新区自主创新能力的途径.     

Binary discrimination methods for high-dimensional data with a geometric representation

Four binary discrimination methods are studied in the context of high-dimension, low sample size data with an asymptotic geometric representation, when the dimension increases while the sample sizes of the classes are fixed. We show that the methods support vector machine, mean difference, distance-weighted discrimination, and maximal data piling have the same asymptotic behavior as the dimension increases. We study the consistent, inconsistent, and strongly inconsistent cases in terms of angles between the normal vectors of the separating hyperplanes of the methods and the optimal direction for classification. A simulation study is done to assess the theoretical results.     

The estimation for Lévy processes in high frequency data

In this article, a generalized Lévy model is proposed and its parameters are estimated in high-frequency data settings. An infinitesimal generator of Lévy processes is used to study the asymptotic properties of the drift and volatility estimators. They are consistent asymptotically and are independent of other parameters making them better than those in Chen et al. (2010 Chen, S. X., Delaigle, A., Hall, P. (2010). Nonparametric estimation for a class of Lévy processes. Journal of Econometrics 157:257–271.[Crossref], [Web of Science ®] , [Google Scholar]). The estimators proposed here also have fast convergence rates and are simple to implement.     

扭带管内油的受迫对流换热实验

以30~#透平油为工质,对在光管内插入三种不同扭率扭带的受迫流动的冷、热态流阻及换热性能进行了实验。实验的雷诺数为200～1150,普朗特数为320～590,实验结果表明:在本实验范围内,插有不同扭率的全长连续扭带管的换热系数为光管的1.7～2.6倍,而阻力系数为光管的3～7.5倍;且扭率的大小对扭带的流阻与换热影响较大。另外,还对间断扭带管内油的受迫对流换热进行了实验。     

高校青年教师课堂教学质量的问题、原因与解决之道

高校青年教师在课堂教学工作上存在教学经验不足、教学基本功不过硬和教学模式单一等五大问题,其主要原因包括“重科研轻教学”的政策导向、教师招聘标准不科学、青年教师培训体系不完善等。可通过改变高校办学理念、加强青年教师师德建设、完善教师培训体系等措施解决问题。     

中学教师工作压力与职业倦怠的成因分析及解决方法

职业倦怠问题是目前中学教师培养乃至于学校发展中所遇到的无法回避的问题之一。研究中学教师的职业倦怠的成因对于解决教师职业倦怠问题,促进教师素质培养和学校发展具有十分重要的意义。文章通过研究和分析教师职业倦怠问题的原因探讨了如何解决教师职业倦怠问题。     

兵团精神与高校大学生核心价值观培育研究

以＂热爱祖国、无私奉献、艰苦创业、开拓进取＂为主要内涵的兵团精神,是社会主义核心价值体系的重要组成部分,是高校培育大学生核心价值观的优质资源,运用兵团精神培育大学生核心价值观要不断丰富兵团精神的育人内涵和精神实质,将兵团精神融入大学生核心价值观教育的教学内容,增强大学文化的育人功能,提高教育的针对性和有效性。     

Unpacking Court Divorce Decrees,Children’s Outcomes,and Three Unconfounded Determinants: An Evidence-Based Look

This article examines evidence on 3 determinants of the outcomes of children of divorce that are shaped but neither confound or are confounded by court decrees for custody and parenting time: father contact or involvement, high interparental conflict, and domestic violence. This evidence is brought to bear in an analysis that contrasts predictions based on the rationales for sole maternal versus joint custody and explores implications for judicial decision making. It is found that the best-interests-of-the-child standard better serves children in contested cases when this evidence is taken into account. A call is made for rebuttable presumptions for joint custody and commensurate parenting time except when parent-perpetrated violence or other patterns of abusive behavior are substantiated. Steps for judicial reform are proposed.     

THE END OF THE ART CONNOISSEUR? EXPERTS AND KNOWLEDGE PRODUCTION IN THE VISUAL ARTS IN THE DIGITAL AGE

In this digital age, declarations surface of the death of the expert and the democratization of information. Crowd wisdom is seen as the new guide in constructing and evaluating knowledge. In the context of the art world, this tension between the amateurs and the experts becomes particularly pronounced as popular meets high culture. Questions arise such as: what is the role of the expert in the evaluation of art in contemporary times? Do social media dismantle age-old hierarchies and established priesthoods in the art world? And can we assume that mass participation in valuation results in better judgments? This article addresses such popular notions of participation and expertise concerning social media in the art world through a historical lens by re-examining and positioning art experts from past to present. Particularly, characteristics of intermediaries in the art market are examined closely regarding their strategies in knowledge production and the establishment of expertise. This historical situatedness enables us to move beyond the hype of new media expectations, generating more appropriate avenues of investigation to better grasp possible changes amongst actors within the contemporary art world. This examination is not just theoretically relevant but practically so, given current pressures on art institutions to embrace and reach out to new audiences online.     

Indo-China: Storm Center of Southeast Asia

The authors report the findings of a survey study in which they investigated high school social studies teachers' current practices, challenges, and needs in relation to instruction of English language learners (ELLs). Thirty-three high school social studies teachers in six English as a second language (ESL)-centered schools in central Virginia participated in the study. Drawing on the findings, three themes demand particular attention: the challenges that social studies teachers face teaching ELLs; the accommodations teachers currently make for ELLs; and the types of support teachers need to teach ELLs social studies more effectively. The authors include findings from the field of second-language education to raise social studies teachers' consciousness about their ELLs' needs and conclude with a number of practical suggestions related to instruction and differentiation that are crucial for social studies teachers to help ELLs learn effectively. Further dialogues are needed, particularly regarding ESL inclusion and teachers' critical awareness of serving this particular group of students.