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   

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   

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   

论教师职业的专业化   总被引：18，自引：0，他引：18  

宋吉缮 《清华大学教育研究》2003,24(1):69-75

教师专业化是社会分化与职业分化的产物。本文首先论述了专门职业的概念，并归纳出专门职业的六大特征，即专业知识和技能、职业道德、长期的专门培养、进修制度、自主权、组织权。进而以此审视教师职业，提出教师职业是“从不成熟走向成熟的专门职业”，在教师专业化发展过程中，也需进一步加强与完善职业基本标推、专门职业观念等。  相似文献   

Larry Cuban, Why is It So Hard to Get Good Schools?     

Libia Gil 《Journal of Educational Change》2004,5(1):91-95

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The Trauma Symptom Checklist for Young Children (TSCYC): reliability and association with abuse exposure in a multi-site study     

Briere J  Johnson K  Bissada A  Damon L  Crouch J  Gil E  Hanson R  Ernst V 《Child abuse & neglect》2001,25(8):1001-1014

OBJECTIVE: The Trauma Symptom Checklist for Young Children (TSCYC) is a 90-item caretaker-report measure of children's trauma- and abuse-related symptomatology. It contains two reporter validity scales and eight clinical scales [Post-traumatic Stress-Intrusion (PTS-I), Post-traumatic Stress-Avoidance (PTS-AV), Post-traumatic Stress-Arousal (PTS-AR), Post-traumatic Stress-Total (PTS-TOT), Sexual Concerns (SC), Dissociation (DIS), Anxiety (ANX), Depression (DEP), and Anger/Aggression (ANG)], as well as an item assessing hours per week of caretaker contact with the child. This paper introduces the TSCYC and describes its psychometric properties in a multisite validity study. METHOD: A total of 219 TSCYCs administered by six clinician/researchers across the United States were analyzed for scale reliability and association with several types of childhood maltreatment. RESULTS: The TSCYC clinical scales have good reliability and are associated with exposure to childhood sexual abuse, physical abuse, and witnessing domestic violence. The PTS-I, PTS-AV, PTS-AR, and PTS-TOT scales were most predictive, followed by SC in the case of sexual abuse and DIS in the case of physical abuse. There were a small number of age, sex, and race effects on TSCYC scores. CONCLUSIONS: The TSCYC appears to have reasonable psychometric characteristics, and correlates as expected with various types of trauma exposure. Subject to continued validation and the development of general population norms, its use as a clinical measure is supported.  相似文献   

Jewish Education,Past and Present: Israel Friedlaender Re-Visited     

Gil Graff 《Journal of Jewish Education》2016,82(4):311-328

A century ago, Israel Friedlaender—scholar, communal activist, and educator—played a key role in such educational institutions as the Teachers Institute of JTS, the Bureau of Jewish Education, the Menorah Society, Young Israel, and Young Judea. A JTS professor and prolific writer, Friedlaender has been described as “the teacher of the Jewish youth of that generation.” Yet, scant attention has been devoted to exploring his educational thought and action agenda. This retrospective focuses on Friedlaender’s activities and impact in advancing Jewish education and considers the relationship of his legacy to current directions in the field.  相似文献