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Manoj K. Harbola 《Resonance》2008,13(2):134-171
In this article we discuss how the concept of quantum of energy came into being from the analysis of black-body spectrum.
We start our discussion with the work of Wien who discovered the general form of black-body spectrum and on the basis of his
discovery proposed a formula to obtain power radiated from a black body as a function of its temperature and the frequency
of radiation. We then focus on the work of Planck who modified Wien’s formula to bring it in close agreement with the experimental
results. However, the real greatness of Planck is displayed in his interpretation of the modified formula that led him to
introduce the revolutionary concept of the quantum of energy. How Planck arrived at this conclusion is described in detail.
We conclude the article with a discussion of the generalization of the concept of quanta by Einstein to propose quantization
of radiation as well as of mechanical vibrations.
Manoj K. Harbola is a professor of physics at the Indian Institute of Technology, Kanpur. His area of research is in the field
of electronic structure of matter and he has contributed significantly to fundamental aspects of density functional theory
and applied it to study atoms, molecules, clusters and solids. 相似文献
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Twan Huybers 《Assessment & Evaluation in Higher Education》2014,39(4):496-513
An important purpose of student evaluation of teaching is to inform an educator’s reflection about the strengths and weaknesses of their teaching approaches. Quantitative instruments are one way of obtaining student responses. They have traditionally taken the form of surveys in which students provide their responses to various statements using item-by-item agree/disagree ratings. Previous research has identified shortcomings of such rating scales, including response bias and the associated lack of discrimination amongst the items evaluated. In this paper, best–worst scaling is proposed as a novel method for quantitative teaching evaluation. The way in which best–worst scaling can be used in this context is illustrated in three different applications. Two applications demonstrate how it can be used for evaluations in a small-size classroom environment. The third application is a broader evaluation of university courses on a larger scale. In comparison with conventional rating scales, the best–worst scaling approach enables better highlighting of the differences between evaluation items. In doing so, it can provide enhanced guidance to educators in their reflection about their teaching. Moreover, implementation and analysis of a best–worst scaling evaluation is relatively straightforward, which establishes it a feasible method for teaching practitioners and researchers. 相似文献
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There is a dearth of research on the work–life balance experiences of academics who undertake short-term international teaching assignments. Academics who teach offshore are also accountable for onshore activities including lecturing, research, supervision of higher degree students, mentoring, publishing and administrative obligations inter alia. These responsibilities pose further challenges to work and life. Within the context of a qualitative design, 11 academics were interviewed in depth regarding their short-term international teaching experiences. Specific issues relating to family separation, excessive work hours, poor assignment planning and lack of organisational recognition were identified. Findings have important implications for academics, and university policy and practice. 相似文献
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Errors are often perceived as undesirable events to be avoided at all costs. However, a growing body of research suggests that making errors is, in fact, beneficial for learning. Building on human resource development literature, the present review proposes a 3P framework of approaches to errors during learning: prevention (avoiding or observing errors), permission (allowing errors), and promotion (inducing or guiding errors). This framework is applied to examine and integrate the empirical evidence on errors that have been commonly investigated in cognitive, educational, and applied psychology research. The psychological mechanisms of each error approach are discussed, and implications for education are considered. This review then concludes by highlighting the ways in which the various error approaches interact with learner characteristics and learning contexts, as well as discussing the role of feedback in error correction and proposing directions for future research toward understanding how errors can be optimized in learning. 相似文献
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Politics of education researchers have long recognized the role of micropolitics in school decision-making processes. We argue that investigating micropolitical dynamics is key to an important set of school decisions that are fundamental to inequities in access to high-quality teachers: assignments of teachers and students to classrooms. Focusing on the intraorganizational political power of experienced teachers, our analysis of survey and administrative data from a large urban district suggests that more experienced teachers have more influence over which students are assigned to their classrooms. By a variety of measures, we also find that more experienced teachers are assigned fewer disadvantaged students, on average, a pattern inconsistent with goals of ameliorating educational inequality by matching more qualified teachers with the students who need them most. 相似文献
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Yue Changjun 《Chinese Education & Society》2014,47(6):12-35
Based on data from nationwide surveys of graduates conducted in 2003, 2005, 2007, 2009, and 2011 by the Institute of Economics of Education, Peking University, this article provides a statistical comparative analysis of employment results and the job search process. It examines the characteristics of college graduate employment in China, as well as changing trends since the massification of Chinese higher education. Policy implications are raised on the basis of the empirical results. 相似文献
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《师资教育杂志》2012,38(5):461-473
In this paper, I analyse the history of teacher education in Australia from 1974 to the current policy moment in which questions are increasingly being asked about the quality of teaching and teacher education. Teacher education is, and has been, a highly scrutinised domain in Australia. Since the 1970s, we have seen more than 100 reviews of teacher education in Australia, with another one recently announced in 2014. I focus on three phases in the growth and development of teacher education in the past 40 years by considering the ways in which teacher education (and teaching) has been thought about at various points in time and analysing the related policies for funding governance and regulation. I finish by focusing on the current policy moment in Australia which is positioning teacher education as a ‘policy problem’ requiring a national solution and consider the role of research in, on and for, teacher education into the future. 相似文献
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Representing Nature of Science in a Science Textbook: Exploring author–editor–publisher interactions
Maurice DiGiuseppe 《International Journal of Science Education》2013,35(7):1061-1082
Current reforms in elementary and secondary science education call for students and teachers to develop more informed views of the nature of science (NOS)—a process in which science textbooks play a significant role. This paper reports on a case study of the development of representations of the NOS in a senior high school chemistry textbook by the book's author, editor, and publisher. The study examines the multiple discourses that arose as the developers reflected on their personal and shared understandings of NOS; squared these with mandated curricula, the educational needs of chemistry students and teachers, and the exigencies of large-scale commercial textbook publishing. As a result, the team developed and incorporated, in the textbook, representations of NOS they believed were the most pedagogically suitable. Analysis of the data in this study indicates that a number of factors significantly influenced the development of representations of NOS, including representational accuracy (the degree to which representations of NOS conformed to informed views of the NOS), representational consistency (the degree to which representations of NOS in different parts of the book conveyed the same meaning), representational appropriateness (the age-, grade-, and reading-level appropriateness of the NOS representations), representational alignment (the degree to which NOS representations aligned with mandated curriculum), representational marketability (the degree to which NOS representations would affect sales of the textbook), and ‘Workplace Resources’ factors including availability of time, relevant expertise, and opportunities for professional development. 相似文献
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While teachers and practitioners are increasingly expected to conduct research on their own practice, there is a lot of educational research that is not directly involved in practice. This often leads to unilateral research perspectives on educational practice. Therefore, this article calls for an alternative model of researching educational practice, summarised through the term ‘pedagogical science’. We argue that practical and normative theories that seek to improve educational practice should be combined with theories that aim to describe and explain. It is further argued that the combination of such perspectives and theories, a so-called stereoscopic point of view, can allow for a thorough and holistic investigation of educational practice. As part of this argumentation, the article addresses critical questions of various theoretical models of educational research, models that are being used in Scandinavian, European and Anglo-American research on educational practice. With reference to interdisciplinary models of educational research, such as educational sciences, learning sciences and Bildungswissenschaften, there are trends in which pedagogy is marginalised. Thus, the second argument of the article calls for placing pedagogy at the centre of knowledge production in a broad sense, after which pedagogy is made into a source of knowledge for pedagogical science, which sets forth to test and provide empirical support for pedagogy-based knowledge. 相似文献
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Andrew Ribner Alex M. Silver Leanne Elliott Melissa E. Libertus 《Child development》2023,94(2):395-410
We explore whether training parents' math skills or playing number games improves children's mathematical skills. Participants were 162 parent–child dyads; 88.3% were white and children (79 female) were 4 years (M = 46.88 months). Dyads were assigned to a number game, shape game, parent-only approximate number system training, parent-only general trivia, or a no-training control condition and asked to play twice weekly for 8 weeks. Children in the number game condition gained over 15% SD on an assessment of mathematical skill than did those in the no-training control. After 8 additional weeks without training, effects diminished; however, children of parents in the ANS condition underperformed those in the no-treatment control, which was partially explained by changes in the home numeracy environment. 相似文献
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Oksana Parylo 《Studies in Educational Evaluation》2012,38(3-4):73-83
This sequential mixed methods study analyzed how program evaluation was used to assess educational administration and examined thematic trends in educational evaluation published over 10 years (2001–2010). First, qualitative content analysis examined the articles in eight peer-reviewed evaluation journals. This analysis revealed that numerous studies have examined educational topics; however, very few of these studies (5 in total) solely focused on evaluating educational administration. Second, quantitative comparison of articles in three select journals (N = 671) showed that in these educational journals, major foci of the published studies were on teaching and learning (20%) and assessment and achievement (13.9%). In comparison, educational administration and leadership was among the least examined (2.3%), being second only to homeschooling (1.6%). 相似文献
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Christian Geiser Samuel D. Mandelman Mei Tan Elena L. Grigorenko 《Structural equation modeling》2016,23(1):76-90
Although the use of multiple criteria and informants is one of the most universally agreed on practices in the identification of gifted children, few studies to date have examined the convergent validity of multiple informants and objective ability tests in gifted identification. In this study, we illustrate the use of the correlated traits–correlated (methods – 1) or CT–C(M – 1) model (Eid, Lischetzke, Nussbeck, & Trierweiler, 2003) to examine the convergent validity of self, parent, and teacher ratings relative to objective cognitive ability tests in a sample of 145 4th to 6th graders. The CT–C(M – 1) analyses revealed that teacher ratings showed the highest convergence with the objective assessments, whereas self-ratings had the lowest reliabilities and insufficient validity. Parent ratings were more reliable and valid than self-reports, but were outperformed by teacher ratings for most abilities. Overall, the CT–C(M – 1) analyses showed that the convergent validity of the ratings relative to the objective test battery was highest for numerical and lowest for creative abilities. Furthermore, whereas part of the shared variance between parent and teacher ratings reflected true convergent validity, agreement between parent and self-reports was entirely due to a shared rater variance. Our analyses demonstrate the usefulness and proper interpretation of the CT–C(M – 1) approach for examining convergent validity and method effects in multitrait–multimethod data. 相似文献
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Cheryl L. Blalock Michael J. Lichtenstein Steven Owen Linda Pruski Carolyn Marshall MaryAnne Toepperwein 《International Journal of Science Education》2013,35(7):961-977
The purpose of this review is to present a comprehensive evaluation of science attitude instruments based on published psychometric evidence. A multitude of instruments have been used through the years and some have been linked to career choice and school performance. Substantiating such associations is of paramount importance if researchers wish to influence educational policy. However, associations are reduced, or hard to discover, if instruments have weak psychometric properties. Several databases were searched for peer‐reviewed articles that discussed the development and use of science attitude instruments. Instruments were grouped into the following categories: attitudes toward science, scientific attitudes, nature of science, scientific career interests, and other. A data abstraction and scoring rubric was used to summarize and evaluate 150 published articles that spanned 66 instruments. Most instruments had single study usage and showed an absence of psychometric evidence. This review demonstrated that there are few instruments available with the necessary psychometric data to merit recommendation. The review quantifies the current state of the research regarding the measurement of science attitude in students; the results should elicit further discussion and encourage more rigorous analyses of instruments. The findings may assist other researchers to select an instrument and alert them to its strengths and weaknesses. This review points the way forward for research in this field. Instruments already in existence should be used in repeat studies, and reliability and validity evidence should be collected and shared. 相似文献
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As student–teacher–scientist partnerships become more widespread, there is a need for research to understand the roles assumed
by scientists and teachers as they interact with students in general and in inquiry learning environments in particular. Although
teacher roles during inquiry learning have been studied, there is a paucity of research about the roles that scientists assume
in their interactions with students. Socio-cultural perspectives on learning emphasize social interaction as a means for students
to make meaning of scientific ideas. Thus, this naturalistic study of classroom discourse aims to explore the ways scientists
and teachers help high school students make meaning during authentic inquiry investigations. Conversational analysis is conducted
of video recordings of discussions between students and teachers and students and scientists from two instances of a student–teacher–scientist
partnership program. A social semiotic analytic framework is used to interpret the actions of scientists and teachers. The
results indicate a range of common and distinct roles for scientists and teachers with respect to the conceptual, social,
pedagogical, and epistemological aspects of meaning making. While scientists provided conceptual and epistemological support
related to their scientific expertise, such as explaining scientific phenomena or aspects of the nature of science, teachers
played a critical role in ensuring students’ access to this knowledge. The results have implications for managing the division
of labor between scientists and teachers in partnership programs. 相似文献