Experimental Control of Simple Pendulum Model     

C. Medina 《Science & Education》2004,13(7):631-640

This paper conveys information about a Physicslaboratory experiment for students with some theoretical knowledge about oscillatory motion. Students construct a simple pendulum that behaves as an ideal one, and analyze model assumption incidence on its period. The following aspects are quantitatively analyzed: vanishing friction, small amplitude, not extensible string, point mass of the body, and vanishing mass of the string.It is concluded that model assumptions are easilyaccomplished in practice, within small experimental errors. Furthermore, this way of carrying out the usual pendulum experiments promotes a better understanding of the scientific modeling process. It allows a deeper comprehension of those physical concepts associated with model assumptions (small amplitude, point mass, etc.), whose physical and epistemological meanings appear clearly related to the model context. Students are introduced to a scientific way of controlling the validity of theoretical development, and they learn to value the power and applicability of scientific modeling.  相似文献   

Teamwork and Entrepreneurial Behavior among K-12 Teachers in the United States     

Roque do Carmo Amorim Neto  Vinícius Picanço Rodrigues  Kathryn Campbell  Meaghan Polega  Torrie Ochsankehl 《The Educational forum》2020,84(2):179-193

Abstract

This study attempted to identify the predictors of entrepreneurial behavior by assessing a series of variables that included teamwork skills and demographic variables, and to explore teachers’ experiences with teamwork. A sample of 367?K-12 public school teachers completed the survey. The findings indicated that teamwork predicts entrepreneurial behavior. Most participants received teamwork training through their school districts. Barriers to teamwork included time constraints, individual differences, and inability to collaborate.  相似文献   

Shared Reading by Cambodian Mothers and Children Learning English as a Second Language: Reciprocal Gains     

Ted Glynn  Vin Glynn 《International Journal of Disability, Development & Education》1986,33(3):159-172

Subjects were five Cambodian mother‐child pairs. Three mothers (Group One) had received one year's schooling, and two (Group Two) had had no schooling in Cambodia; all children were participating in regular primary school class reading programs and receiving individual help from an ESL teacher. Group One was introduced to Shared Reading in a multiple baseline across‐subjects design, while an AB design was used for Group Two. Probes were taken of mothers and children reading individually from unseen books at the same level as those used in Shared Reading. During the Shared Reading program the Group One mothers and children markedly increased their rate of progress through book levels as did the Group Two children, but the Group Two mothers did not, although there was some evidence of minor progress in word recognition. Results are discussed in terms of the importance of the interactive social context for acquiring literacy skills.  相似文献   

What Schools Need to Know About Fostering School Belonging: a Meta-analysis     

Kelly Allen  Margaret L. Kern  Dianne Vella-Brodrick  John Hattie  Lea Waters 《Educational Psychology Review》2018,30(1):1-34

Belonging is an essential aspect of psychological functioning. Schools offer unique opportunities to improve belonging for school-aged children. Research on school belonging, however, has been fragmented and diluted by inconsistency in the use of terminology. To resolve some of these inconsistencies, the current study uses meta-analysis of individual and social level factors that influence school belonging. These findings aim to provide guidance on the factors schools should emphasise to best support students. First, a systematic review identified 10 themes that influence school belonging at the student level during adolescence in educational settings (academic motivation, emotional stability, personal characteristics, parent support, peer support, teacher support, gender, race and ethnicity, extracurricular activities and environmental/school safety). Second, the average association between each of these themes and school belonging was meta-analytically examined across 51 studies (N?=?67,378). Teacher support and positive personal characteristics were the strongest predictors of school belonging. Results varied by geographic location, with effects generally stronger in rural than in urban locations. The findings may be useful in improving perceptions of school belonging for secondary students through the design of policy, pedagogy and teacher training, by encouraging school leaders and educators to build qualities within the students and change school systems and processes.  相似文献   

Transfer paths and academic performance: The primary school merger program in china     

Di Mo  Hongmei Yi  Linxiu Zhang  Yaojiang Shi  Scott Rozelle  Alexis Medina 《International Journal of Educational Development》2012

In the late 1990s and early 2000s, China's Ministry of Education embarked on an ambitious program of primary school mergers by shutting down small village schools and opening up larger centralized schools in towns and county seats. The goal of the program was to improve the teacher and building resources in an attempt to raise the human capital of students in poor rural areas, although it was recognized that students would lose the opportunity to learn in the settings of their own familiar villages. Because of the increased distances to the new centralized schools, the merger program also entailed building boarding facilities and encouraging or mandating that students live at school during the week away from their family. Given the magnitude of the program and the obvious mix of benefits and costs that such a program entails there has been surprisingly little effort to evaluate the impact of creating a new system that transfers students from school to school during their primary school period of education and, in some cases, making student live in boarding facilities at school. In this paper, our overall goal is to examine the impact of the Rural Primary School Merger Program on academic performance of students using a dataset from a survey that we designed to reflect transfer paths and boarding statuses of students. We use OLS and Propensity Score Matching approaches and demonstrate that there is a large “resource effect” (that is, an effect that appears to be associated with the better facilities and higher quality of teachers in the town and county schools) that appears to be associated with the transfers of students from less centralized schools (such as village schools) to more centralized schools. Boarding, however, is shown to have negative impacts on academic performance. However, students who transfer to county school benefit from the transfer no matter where they start and whether they board or not.  相似文献   

Meetings of Directors of the National Libraries in the socialist countries held in, 1967–1968     

Josef Vinárek 《International Information and Library Review》2013,45(1):89-91

Abstract

The years 1989–91 saw tremendous changes in the political map of Eastern Europe. These changes have resulted in varying degrees of acquisition difficulties for Slavic and Eastern European language collections in Western libraries. The following is an early assessment of the difficulties and the resultant damage done to Slavic collections in the West. Preliminary results show that, on the whole, book receipts are down considerably, prices are up considerably, and inconsistency is the only consistency. The data discussed here were gathered by means of a survey of certain aspects of Slavic¹ acquisitions. These data are supplemented throughout by qualitative material gleaned from comments made by vendors and librarians at the 1993 Slavic Librarians' Workshop held at Urbana, Illinois.  相似文献   

Effects of audiovisual stimuli on psychological and psychophysiological responses during exercise in adults with obesity     

Marcelo Bigliassi  João P. A. Greca  Vinícius Barreto-Silva  Priscila Chierotti  Arli R. de Oliveira  Leandro R. Altimari 《Journal of sports sciences》2019,37(5):525-536

The present experiment sought to further understanding of the effects of personalised audiovisual stimuli on psychological and psychophysiological responses during exercise in adults with obesity. Twenty-four participants (M_age = 28.3, SD = 5.5 years; M_BMI = 32.2, SD = 2.4) engaged in self-paced exercises on a recumbent cycle ergometer and three conditions (sensory stimulation [ST], sensory deprivation [DE], and control [CO]) were administered. Perceptual (attentional focus and perceived exertion), affective (affective state and perceived activation), and psychophysiological (heart rate variability) parameters were monitored throughout the exercise bouts. A one-way repeated measures analysis of variance was used to compare self-reported and psychophysiological variables (main and interaction effects [5 Timepoints × 3 Conditions]). The results indicate that ST increased the use of dissociative thoughts throughout the exercise session (η_p² = .19), ameliorated fatigue-related symptoms (η_p² = .15) and elicited more positive affective responses (η_p² = .12) than CO and DE. Accordingly, personally-compiled videos are highly effective in ameliorating exertional responses and enhancing affective valence during self-paced exercise in adults with obesity. Audiovisual stimuli could be used during the most critical periods of the exercise regimen (e.g., first training sessions) when individuals with obesity are more likely to focus on fatigue-related sensations.  相似文献   

Temporal nonmonotonic logical systems: Interrelationships and computational complexity     

M. M. Vin’kov  I. B. Fominykh 《Scientific and Technical Information Processing》2010,37(6):413-417

This paper considers nonmonotonic logical systems that extend linear temporal logic with clocks. Our main emphasis is on their interrelationships and on the characteristics of their computational complexity.  相似文献   

New directions in library binding: a conference report     

Kristen Kern   《Library Collections, Acquisitions, and Technical Services》1999,23(4):451-458

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Interoperability and Information Integration in an Early Online Academic Digital Library of Theses and Dissertations: The Case of BTD     

Roberto Carlos dos Santos Pacheco  Vinícius Medina Kern  Paulo Henrique S. Bermejo 《International Information and Library Review》2003,35(2-4):319

Cooperative organization has been proposed as a means to improve the usefulness of virtual libraries. Information interchange among library and other academic applications is often hindered by the lack of application interoperability. This hindrance may be overcome through the development of standards that allow for digital libraries to exchange and share information with other applications. The Graduate Program in Production Engineering (PPGEP) of the Federal University of Santa Catarina (UFSC) launched its Theses and Dissertations Bank (BTD) in 1995. BTD is possibly the first online academic digital library of theses. From a digital document repository, BTD evolved into a system that combines bibliometry and informetry features. BTD is used by students and faculty in their research activities, but also by decision makers from industry and academia. They use it, respectively, to search for specialists and to measure interest and knowledge interchange among PPGEP research areas. This article presents the history, features, and development prospects for the BTD project. The integration of BTD with other academic applications, especially those of the Brazilian national science and technology platform, is emphasized.  相似文献