Should I stay or should I go? Predictors and effects of studying abroad during high school     

《Learning and Instruction》2021

In an increasingly globalized and culturally diverse world, extended stays abroad during high school are considered important opportunities for acquiring and improving a variety of skills, most importantly, language achievement. This study examines both predictors and effects of studying abroad in an English-speaking country during high school, using population data from the second largest city in Germany (N = 5361; 13% went abroad). In order to determine the most central predictors of studying abroad, we employed logistic regression models in which students’ socioeconomic background emerged as the strongest predictor of studying abroad. To test the effects of studying abroad, we applied propensity score matching. Studying abroad had positive effects on standardized achievement, grades, and course choice in English, whereas it had hardly any effects on outcomes in math. Implications for studying abroad during high school and future research directions are discussed.  相似文献   

Where do you come from,where do you go? Assessing skills gaps and labour market outcomes for young adults with different immigration backgrounds     

《International Journal of Educational Development》2021

Using PISA and PIAAC data from twelve OECD countries, we examine the gap in cognitive skills among immigrants and natives and evaluate how those differences have evolved over time. We also consider how demographics, family background and school quality explain the development of cognitive skills of young people with immigrant backgrounds. The results show, first, that some convergence in skills occurs between second-generation immigrants and natives over time. Second, demographics, family background and school quality variables all contribute to the achievement gaps across different groups.  相似文献   

Production of green surfactants: Market prospects     

《Electronic Journal of Biotechnology》2021

Science has greatly contributed to the advancement of technology and to the innovation of production processes and their applications. Cleaning products have become indispensable in today’s world, as personal and environmental hygiene is important to all societies worldwide. Such products are used in the home, in most work environments and in the industrial sectors. Most of the detergents on the market are synthesised from petrochemical products. However, the interest in reducing the use of products harmful to human health and the environment has led to the search for detergents formulated with natural, biodegradable surfactant components of biological (plant or microbiological) origin or chemically synthesised from natural raw materials usually referred to as green surfactants. This review addresses the different types, properties, and uses of surfactants, with a focus on green surfactants, and describes the current scenario as well as the projections for the future market economy related to the production of the different types of green surfactants marketed in the world.How to cite: Farias CBB, Almeida FCG, Silva IA, et al. Production of green surfactants: Market prospects. Electron J Biotechnol 2021;51. https://doi.org/10.1016/j.ejbt.2021.02.002  相似文献   

面向幼儿发展的表现性评价实践研究     

张蕊 《科教文汇》2020,(13):151-152

本研究采用表现性评价,对x幼儿园大班一个班级39名幼儿进行为期一年的发展性评价,在真实情境中对幼儿的发展状况作出连续性评价,获悉幼儿不同阶段的发展状况,同时对评价过程进行总结和反思。  相似文献   

Using the Information Structure Model to Compare Profile-Based Information Filtering Systems     

Yuval Elovici  Bracha Shapira  Paul B. Kantor 《Information Retrieval》2003,6(1):75-97

In the IR field it is clear that the value of a system depends on the cost and benefit profiles of its users. It would seem obvious that different users would prefer different systems. In the TREC-9 filtering track, systems are evaluated by a utility measure specifying a given cost and benefit. However, in the study of decision systems it is known that, in some cases, one system may be unconditionally better than another. In this paper we employ a decision theoretic approach to find conditions under which an Information Filtering (IF) system is unconditionally superior to another for all users regardless of their cost and benefit profiles.It is well known that if two IF systems have equal precision the system with better recall will be preferred by all users. Similarly, with equal recall, better precision is universally preferred. We confirm these known results and discover an unexpected dominance relation in which a system with lower recall will be universally preferred provided its precision is sufficiently higher.  相似文献   

对我国企业体育目前的现状、不足和发展趋势的研究   总被引：4，自引：0，他引：4  

郝小刚 《南京体育学院学报(社会科学版)》2003,17(2):44-45,30

通过分析我国目前企业体育在市场经济制度下存在的不足 ,找出原因。借鉴国外企业体育的发展过程 ,从而得知职工体育俱乐部是我国企业体育的必然发展趋势。  相似文献   

美国竞技体育"霸主"地位之透析   总被引：8，自引：0，他引：8  

赵云宏  张秀华 《中国体育科技》2003,39(10):60-62

通过查阅文献资料、访问调查、数理统计等方法 ,分析了美国参加奥运会以来的实力表现 ,在此基础上 ,对导致美国竞技体育霸主地位的因素——世界政治格局变化、西方文化精神、美国的社会分层结构、黑人的先天优势、高校竞技体育、发达的职业体育、科学化训练等进行了全面的论述 ,以为我国的竞技体育决策部门提供参考。  相似文献   

论我国媒体与体育的合作态势及前景   总被引：9，自引：0，他引：9  

王蔚岚 《天津体育学院学报》2003,18(4):68-71

运用文献资料法，讨论了电视、报纸、杂志和网络4种媒体与体育的关系；分析了各类媒体在开发体育市场过程中的特点；提出各类媒体的相应市场策略；揭示了各媒体与体育的合作态势及潜在的市场变化。认为，体育电视行业如何拓展盈利模式是当务之急；网络将是电视最强有力的竞争对手；体育报纸的转型已不可避免；体育杂志则应通过精致化和娱乐化来吸引读者。整合各种体育媒体资源，组成跨媒体平台，节约成本，获得更大的利润。是未来体育媒体的发展趋势。  相似文献   

论大众竞技运动与精英竞技运动的协调发展   总被引：4，自引：0，他引：4  

陈勇军  邹国忠  王正伦  王爱丰 《南京体育学院学报(社会科学版)》2003,17(3):23-27

体育与竞技运动是两个不同的概念 ,两者都有普及与提高的问题 ,精英竞技运动的发展不是建立在大众体育和学校体育的基础之上的 ,其发展的基础是竞技运动在全社会的普及。传统的认识存在许多缺陷 ,导致在实践中产生很多偏差。讨论了大众竞技运动与精英竞技运动的异同 ,分析了西方国家管理与发展竞技运动的模式、中国发展竞技运动成功的经验及存在的问题 ,说明了应如何理解所谓大众竞技运动与精英竞技运动协调发展的问题 ,最后从 5个方面探讨了大众竞技运动与精英竞技运动协调发展的基本对策。  相似文献   

中外竞技体育后备人才培养体制的比较研究   总被引：28，自引：2，他引：26  

马志和  徐宏伟  赵鸽尔 《体育科研》2003,24(3):55-58

运用文献资料法、专家咨询等方法,对中外竞技体育后备人才培养体制进行了比较研究。结论:中国应借鉴国外社会自治型的经验,转变政府职能,在充分保障原有体制运行效率的基础上,构建教育系统一体化人才培养体系;引入市场机制,动员社会力量参与竞技体育后备人才培养。  相似文献