Electrical engineering and nontechnical design variables of multiple inductive loop systems for auditoriums     

Alterovitz G 《Journal of deaf studies and deaf education》2004,9(2):202-209

This research analyzed both engineering and nontechnical issues involved in the use of Induction Loop Amplification (ILA) devices in auditoriums or large gathering places for hard-of-hearing individuals. A variety of parameters need to be taken into account to determine an optimal shape/configuration for the ILA device. In many cases, an optimal configuration is different from those proposed for classroom use (Ross, 1969; Hodgson, 1986; Clevenger, 1992). Experimental results were obtained for a double-loop configuration in such a setting (a university gymnasium/auditorium in this case). The results demonstrate that a double-loop configuration is a viable possibility for auditorium use. Several variables using this configuration were examined, and experimentation was done. Various implications, including consequent nontechnical issues specific to this application, are discussed as well. Technical and nontechnical aspects of the ILA configuration need to be examined together when designing an optimal system.  相似文献   

中国古代人口质量观初探   总被引：1，自引：0，他引：1  

段塔丽 《陕西师范大学继续教育学报》2002,19(1):43-46

人口问题是关系到一个国家或地区经济与社会可持续发展的大问题，而人口质量则是构成人口问题的重要内容之一，中国古代人口思想相当丰富，挖掘其理论宝库，特别是吸取和总结中国古代思想家们有关人口质量的问题的论述，对于我国目前控制人口数量，提高人口素质，不无一定的借鉴作用。  相似文献   

How specific is the shape bias?     

Diesendruck G  Bloom P 《Child development》2003,74(1):168-178

Children tend to extend object names on the basis of sameness of shape, rather than size, color, or material-a tendency that has been dubbed the "shape bias." Is the shape bias the result of well-learned associations between words and objects? Or does it exist because of a general belief that shape is a good indicator of object category membership? The present three studies addressed this debate by exploring whether the shape bias is specific to naming. In Study 1, 3-year-olds showed the shape bias both when asked to extend a novel name and when asked to select an object of the same kind as a target object. Study 2 found the same shape bias when children were asked to generalize properties relevant to category membership. Study 3 replicated the findings from Study 1 with 2-year-olds. These findings suggest that the shape bias derives from children's beliefs about object kinds and is not the product of associative learning.  相似文献   

An examination of the interactions between museum educators and students on a school visit to science museum     

Neta Shaby  Orit Ben-Zvi Assaraf  Tali Tal 《科学教学研究杂志》2019,56(2):211-239

Today, science is a major part of western culture. Discussions about the need for members of the public to access and understand scientific information are therefore well established, citing the importance of such information to responsible citizenship, democracy, socially accountable scientific research and public funding (National Research Council [2009] Learning science in informal environments: People, places, and pursuits. National Academies Press). In recent years there has been an increased interest in investigating not just what visitors to informal environments have learnt after a visit, but also how visitors interact and engage with exhibits during the visit (Davidsson & Jakobsson [2012] Understanding interactions at science centers and museums: Approaching sociocultural perspectives. Rotterdam: Sense Publishers). Within the field of school visits to science museums, however, interactions between students and museum educators (MEs) remain relatively unexplored. In our study of such school visits, we are mainly interested in the interactions that take place between three agents—the students, the museum educator and the physical setting of the exhibit. Using moment-to-moment fine grain analysis of multiple interactions allowed us to identify recurring patterns between students and the museum educators around exhibits, and to examine the MEs’ mediational role during the interactions, and the practices they employ to engage students with exhibits. Our study revealed that most interactions between MEs and students consist of technical explanations of how to operate the exhibits. The interactions that do move past this stage often include two main practices, which the MEs use to promote students’ engagement with the exhibits: physical instruction and engaging the students emotionally. Understanding what is actually happening in the learning process that occurs during students’ interactions with exhibits can help museum educators and exhibit designers improve the experiences of students on school visits.  相似文献   

Skipping class in college and exam performance: Evidence from a regression discontinuity classroom experiment     

Carlos Dobkin  Ricard Gil  Justin Marion 《Economics of Education Review》2010,29(4):566-575

In this paper we estimate the effect of class attendance on exam performance by implementing a policy in three large economics classes that required students scoring below the median on the midterm exam to attend class. This policy generated a large discontinuity in the rate of post-midterm attendance at the median of the midterm score. We estimate that near the policy threshold, the post-midterm attendance rate was 36 percentage points higher for those students facing compulsory attendance. The discontinuous attendance policy is also associated with a significant difference in performance on the final exam. We estimate that a 10 percentage point increase in a student's overall attendance rate results in a 0.17 standard deviation increase in the final exam score without adversely affecting performance on other classes taken concurrently.  相似文献   

Impact of question-answering tasks on search processes and reading comprehension     

Raquel Cerdán  Eduardo Vidal-Abarca  Tomás Martínez  Ramiro Gilabert  Laura Gil 《Learning and Instruction》2009,19(1):13-27

This study examined the effect of (a) high- and low-level questions and (b) reading the text before the questions asked on performance, delayed text recall, and deep text comprehension, as well as on specific text-inspection patterns. Participants were 37 undergraduate students who answered either high- or low-level questions using the software Read&Answer to read and answer questions on the computer screen. Additionally, half of the sample read first a text and then answered the questions (reading-first condition), whereas the other half answered the questions without having read the text in advance (no-reading-first condition). All participants had the text available to search for the answer. Results indicated that high-level questions facilitated deep comprehension but not immediate performance or delayed recall of text, independently of the reading condition, and that high- and low-level questions differentially affected text-inspection patterns.  相似文献   

Resistive pulse sensing of magnetic beads and supraparticle structures using tunable pores     

Willmott GR  Platt M  Lee GU 《Biomicrofluidics》2012,6(1):14103-1410315

Tunable pores (TPs) have been used for resistive pulse sensing of 1 μm superparamagnetic beads, both dispersed and within a magnetic field. Upon application of this field, magnetic supraparticle structures (SPSs) were observed. Onset of aggregation was most effectively indicated by an increase in the mean event magnitude, with data collected using an automated thresholding method. Simulations enabled discrimination between resistive pulses caused by dimers and individual particles. Distinct but time-correlated peaks were often observed, suggesting that SPSs became separated in pressure-driven flow focused at the pore constriction. The distinct properties of magnetophoretic and pressure-driven transport mechanisms can explain variations in the event rate when particles move through an asymmetric pore in either direction, with or without a magnetic field applied. Use of TPs for resistive pulse sensing holds potential for efficient, versatile analysis and measurement of nano- and microparticles, while magnetic beads and particle aggregation play important roles in many prospective biosensing applications.  相似文献   

Higher education and equity in Portugal     

Belmiro Gil Cabrito 《Tertiary Education and Management》2013,19(1):23-39

Abstract

The main topic of this article is to consider the role of the State in providing higher education in Portugal, paying attention to the fact that the privatisation of higher education has been in place since the eighties (Amaral 1999) and also that it is difficult for students and their families to find the monetary resources needed for attendance at university (Cabrito 1999). The discussion focuses on the funding of higher education in a quasi‐market situation (Le Grand et al. 1993), as Portugal hasn't escaped the universal trend towards privatisation of education (Whitty et al. 1998). In the last decade, the relationship between State, universities and students has been changing rapidly (Acherman et al. 1989; Barr et al. 1993; Williams 1990; Henkel et al. 1999), and some arguments are presented that equity in access to higher education must be guaranteed (Mora 1997; UNESCO 1998; Williams 1992). In this connection, the need is argued for free attendance on higher education and State subsidies to students to cover the costs of education. Firstly, the economic and social condition of university students is presented. Using data from two periods, one academic year from the 60s and one from the 90s, the increase in the degree of equity that the university system had known in recent decades can be verified. According to the analysis, the Portuguese population in general is better represented in the university student body nowadays, than in the 60s. Therefore, it is possible to discuss the maintenance of a low degree of equity in the Portuguese university system. For this, the economic and social condition of university students is compared with ‐ that of the Portuguese population in the 90s. Secondly, the expectations of the students of higher education are presented, in order to understand the value attached by them to a university degree, which explains the social demand for education. Finally, the costs of higher education, both private and public, are evaluated. From this evaluation, it is possible to conclude that the principal source of funding of higher education costs is the student and his/her family and to discuss the need for a more interventionist State in higher education financing.  相似文献   

Multiple Outcomes of Class Visits to Natural History Museums: The Students’ View   总被引：2，自引：0，他引：2  

Yael Bamberger  Tali Tal 《Journal of Science Education and Technology》2008,17(3):274-284

The purpose of this study was to describe and understand the range of outcomes of class visits to natural history museums. The theoretical framework is based on the multifaceted process of learning in free choice learning environments, and emphasizes the unique and individual learning experience in museum settings. The study’s significance is in highlighting several possible cognitive as well as non-cognitive learning effects in museums class visits, by providing the student’s point of view. Data was collected by semi-structured interviews with 50 students in grades 6–8 on the day following the visit. We present evidence that students expressed several learning outcomes, connected directly and indirectly to the scientific content of the visit. Content oriented outcomes included acquiring scientific knowledge and making connections to prior knowledge; social oriented outcomes were identified in students’ statements regarding communicating knowledge and social aspects of learning; and interest oriented outcomes were evidenced by students’ expressions about emotions, interest and curiosity. The aggregate data addressed the common outcomes and the impact of class visits to natural history museums in the short term. Comparisons between two types of museums show significant differences in several aspects, regarding the exhibit and/or the activity type. Practical ideas for structuring the ultimate experience are included.  相似文献   

Learning about agriculture within the framework of education for sustainability     

Tali Tal 《Environmental Education Research》2008,14(3):273-290

The last two decades have seen increased threats to agricultural landscapes in Israel. Key factors include population growth, strong pressure from construction entrepreneurs and possible profit to land owners who benefit from a legal conversion of farmland into lands allocated for construction. While each Israeli elementary school student used to participate in agriculture classes, most students no longer experience this and their overall exposure to farming in schools is limited. The main objective of this study was to explore the ways farming is presented and addressed in the national curriculum and in learning materials. Additionally, it examines the actual status of teaching about agriculture and explores how farming is addressed in teachers' pre‐service programmes. The main finding is that very little teaching about agriculture and land management is carried out at most school levels. Only one college prepares agriculture teachers and science education programmes rarely address agriculture as a course topic. The paper also outlines an education for sustainability framework for integrating science, agriculture and environmental education.  相似文献