Why 3D Print? The 21st-Century Skills Students Develop While Engaging in 3D Printing Projects

The emergence of 3D printing has raised hopes and concerns about how it can be used effectively as an educational technology in school classrooms. This paper presents the results of a survey asking teachers from multiple grade levels and subject fields about the impact of 3D projects on student learning. Teachers were asked about the kinds of 3D projects they were doing with students and what skills or knowledge students were developing by participating in those projects. Participants reported that their students developed a number of skills while working on 3D printing projects, including 3D modeling, creativity, technology literacy, problem-solving, self-directed learning, critical thinking, and perseverance. Parallels between teacher-identified skills and widely cited lists of 21^st-century skills suggest that 3D projects are a promising approach to preparing students for life and work in a digital age.     

基于J2EE的数字图书馆设计

结合数字图书馆系统的开发介绍了J2EE平台的一些基本特征，以及在J2EE平台基础上实现一个数字图书馆系统的体系结构、基本功能和相关实现的细节。最后。以数字图书馆信息检索为例介绍了开发的基本过程。     

一种基于Log4J的日志输出组件的设计

在软件开发和系统的运行过程中,日志管理是一个非常重要的部分。通过对在Log4J的基础上设计出适用于特定系统的日志输出组件进行的研究,从而减少了系统中大量冗余代码,提高了开发效率及开发的一致性。     

基于JAVA技术的移动警务系统

现代无线通讯技术的发展使得移动警务系统的实现成为了可能，本文介绍了一个完整的基于JAVA技术的移动警务系统的构建与实现，主要从系统总体设计和系统安全方面提出了完整的移动警务系统的解决方案。     

宋代印刷传媒与诗分唐宋

雕版印刷作为图书传播之媒介,崛起繁荣于右文崇儒之宋代。印刷传媒挟其＂易成、难毁、节费、便藏＂,化身千万,无远弗届之优势,初与抄本、写本竞奇争辉,终则印本取代写本,成为知识传媒之新宠,促使宋代士人之阅读接受更加多元与丰富。印刷术在两宋之传媒效应,传世文献征存不多,笔者拟借镜谷登堡发明活字版印刷术,在中古欧洲改变了阅读环境,影响了接受反应,同时加速古老变革,重组文学领域,征存传统典籍,催生创新体类。凡此,两相对照,皆攸关印刷文化史之探索,堪称创新研究之课题,值得开发讨论。     

Can districts keep good teachers in the schools that need them most?

This study investigates how school demographics and their interactions with policies affect the mobility behaviors of public school teachers with various human capital characteristics. Using data from North Carolina from 1995 to 2006, it finds that teachers’ career stage and human capital investments dominate their decisions to leave public school teaching and school demographic characteristics play a dominant role in intra-system sorting. Schools serving at-risk children struggle to attract and retain teachers with desirable observable characteristics. We find evidence to suggest that across-the-board school-based pay-for-performance policies have small but significant associations with mobility decisions and appear to exacerbate inequities in the distribution of teacher qualifications.     

College selectivity and young adult health behaviors

Large literatures have shown important links between the quantity of completed education and health outcomes on one hand and the quality or selectivity of schooling on a host of adult outcomes, such as wages, on the other hand. However, little research attempts to produce evidence of the link between school quality and health. The paper presents the first evidence in the literature on the potential short and intermediate term effects of attending a selective college on health behaviors during and following college attendance. Using a variety of empirical methods, this paper shows strong evidence that college selectivity reduces tobacco and marijuana use but has small and possibly positive effects on binge drinking. The effects on weight behaviors are suggestive of reduced weight, potentially through diet, but not exercise change.     

Is it where you go or who you know? On the relationship between students, Ph.D. program quality, dissertation advisor prominence, and early career publishing success

Previous research finds that both Ph.D. program quality and relative dissertation advisor prominence are positively related to early-career publishing success. We provide insight into the relative importance of those factors by estimating early-career research productivity functions that: (1) allow relative dissertation advisor prominence to vary while holding Ph.D. program quality constant and (2) allow Ph.D. program quality to vary while holding relative dissertation advisor prominence constant. Results for a sample of 2983 economics Ph.D. recipients suggest that: (1) the estimated marginal effects of relative dissertation advisor prominence do not vary systematically within top Ph.D. programs and (2) students graduating from a program-switching advisor's higher-ranked program publish significantly more than those graduating from his or her lower-ranked program. Combined, these results might suggest that the observed correlation between dissertation advisor prominence and early-career publishing results more from students working with prominent advisors possessing the higher innate potential required to gain admission to top programs rather than strictly because they work with the more prominent advisor.     

Poisoning the mind: Arsenic contamination of drinking water wells and children's educational achievement in rural Bangladesh

Bangladesh has experienced the largest mass poisoning of a population in history owing to contamination of groundwater with naturally occurring inorganic arsenic. Prolonged drinking of such water risks development of diseases and therefore has implications for children's cognitive and psychological development. This study examines the effect of arsenic contamination of tubewells, the primary source of drinking water at home, on the learning outcome of school-going children in rural Bangladesh using recent nationally representative data on secondary school children. We unambiguously find a negative and statistically significant correlation between mathematics scores and arsenic-contaminated drinking tubewells at home, net of the child's socio-economic status, parental background and school specific unobserved correlates of learning. Similar correlations are found for an alternative measure of student achievement and subjective well-being (i.e. self-reported measure of life satisfaction), of the student. We conclude by discussing the policy implication of our findings in the context of the current debate over the adverse effect of arsenic poisoning on children.     

Keeping up with the Joneses: Institutional changes following the adoption of a merit aid policy

The increasing use by private colleges and universities of financial aid based on “merit”, as opposed to based solely on financial need has caused many to raise concerns that this type of aid will go mainly to higher income students crowding out aid to lower income students. However, some analysts suggest that by attracting more “almost full-paying” students through the use of merit aid, institutions will have more financial resources that they can use to increase their financial aid to low-income students and thus their enrollment. Results using data from the College Board's Annual Survey of Colleges and other secondary data sources suggest that the increased use of merit aid is associated with a decrease in enrollment of low-income and minority students, particularly at more selective institutions. Middle and bottom tier colleges may be offsetting costs with tuition increases, as the introduction of merit aid is accompanied by an increase in net costs.