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Abstract The nature of physics as a scientific discipline is largely determined by the models of reality it utilizes. It is therefore appropriate that teachers of physics have a sound knowledge of the origin and nature of these models, their functions and the role they play in the development of the discipline. The results of a study with regard to the perceptions of models held by prospective physical science (a combination of physics and chemistry) teachers studying at South African universities are reported in this paper. The overall conclusion drawn from the study is that these students are far from prepared to incorporate models properly in their teaching. General misconceptions about models have also been identified. These misconceptions can have far‐reaching effects on the structuring of the physics knowledge of pupils exposed to them. 相似文献
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This study aims to increase our understanding of the dynamics of the Palestinian media and the conditions and circumstances in which they work, including both the conflict with Israel and the internal political strife within Palestinian society. It is based on the use of qualitative research methods and was conducted in two stages. First, we performed a mapping of Palestinian media outlets. Data on these Palestinian media outlets were collected online from the West Bank-based Palestinian Authority’s Ministry of Information website, the Gaza-based Hamas government’s Ministry of Information website, and statements published by Palestinian media outlets on their websites describing their affiliation and ownership. Second, to gain a more in-depth understanding of the dynamics and experience of practicing journalism in a situation of asymmetrical conflict, semistructured in-depth interviews were conducted with 25 professional local Palestinian journalists working for local media outlets in the Gaza Strip, the West Bank, and East Jerusalem. Through this study we aim to learn more about how groups shape and express their narratives and agendas through the media when restricted by the conditions, pressures, and limitations of asymmetrical conflict. 相似文献
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The present study employed a think‐aloud method to explore the origin of centrality deficit (i.e., poor recall of central ideas) in individuals with Attention Deficit Hyperactivity Disorder (ADHD). Moreover, utilizing the diverse think‐aloud responses, we examined the overall quality of text processing employed by individuals with ADHD during reading, in order to shed more light on text‐level deficiencies underlying their poor comprehension after reading. To address these goals, adolescents with and without ADHD were asked to state aloud whatever comes to their minds during the reading of two expository texts. After reading, the participants freely recalled text ideas and answered multiple‐choice questions on the texts. Compared to controls, participants with ADHD generated fewer responses that reflect deep, efficient text processing, and reinstated fewer prior text ideas, particularly central ones, during reading. Moreover, the proportions of deep processing responses positively associated with participants’ performance on recall and comprehension tasks. These findings suggest that individuals with ADHD exhibit poor text comprehension and memory, particularly of central ideas, because they construct a low‐quality, less‐connected text representation during reading, and produce fewer, less‐elaborated retrieval cues for subsequent tasks after reading. 相似文献
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A humane method (from the perspective of faculty and of students) to improve the writing of students, from freshmen to graduate, is described. This method follows the standard procedure of submission of a paper to a journal, whereby the students (peer) review each other's work, revise their papers in light of the referee's comments (or rebut them). Then acceptance for publication by the editor is marked by a high grade. It has been used in a variety of physics-related courses (astronomy, high-fidelity sound, biophysics), and also in general university-wide courses (The Atomic Bomb, The Bhagavad-Gita). The method introduces students to broadly-accepted scholarly communication modes of communicating ideas, with anonymous reviews. With suitable organization the time spent by faculty can be readily reduced, and faculty efficiency improved, to make the method convenient and viable. Also, it seems that other disciplines can use this method to advantage. 相似文献
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This paper deals with the computation of the values of two functionals which are defined over the sample paths of a randomly rotating rigid body. It is assumed that the body is subjected to two different kinds of perturbation. The first kind of perturbation is represented by the standard Wiener process and the second kind by a homogeneous process with independent increments, finite second-order moments, mean zero and no continuous sample functions. In order to measure quantitatively the stochastic stability of the body's motion, two functionals are defined over its sample paths. It is shown that each of these functionals is a solution to a corresponding partial integro-differential equation. A numerical procedure for the solution of these equations is suggested, and its efficiency and applicability are demonstrated with examples. 相似文献
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The present study employed a think-aloud method to explore the origin of a centrality deficit (i.e., poor recall of central ideas) found in poor comprehenders (PC). Moreover, utilizing the diverse think-aloud responses, we examined the overall quality of text processing employed by PC during reading, in order to shed more light on the cognitive underpinnings underlying their poor comprehension and memory after reading. To address these goals, adolescents with good and poor comprehension, matched on reading (decoding) skills, were asked to state aloud whatever comes to their mind during the reading of two expository texts. After reading, the participants freely recalled text ideas and answered multiple-choice questions on the texts. Results indicated that PC exhibited lower performance than good comprehenders (GC) on the recall and comprehension tasks. The think-aloud protocols indicated that PC generated fewer responses than GC that reflect high-level, deep text processing, and more responses that reflect low-level, surface text processing. Furthermore, compared to GC, PC reinstated fewer prior text ideas, with this reduction being significantly greater for central than for peripheral ideas. Finally, the proportions of deep processing responses in general were positively associated with participants’ performance on recall and comprehension tasks. These findings suggest that PC exhibit poor text comprehension and memory, particularly of central ideas, because they construct a low-quality, poorly-connected text representation during reading, and produce fewer, less-elaborated retrieval cues for subsequent text comprehension and memory. This explanation is further illuminated in the context of previous findings and theoretical accounts.
相似文献9.
A controversy has recently developed regarding the hypothesis that developmental dyslexia may be caused, in some cases, by a reduced visual attention span (VAS). To examine this hypothesis, independent of phonological abilities, researchers tested the ability of dyslexic participants to recognize arrays of unfamiliar visual characters. Employing this test, findings were rather equivocal: dyslexic participants exhibited poor performance in some studies but normal performance in others. The present study explored four methodological differences revealed between the two sets of studies that might underlie their conflicting results. Specifically, in two experiments we examined whether a VAS deficit is (a) specific to recognition of multi-character arrays as wholes rather than of individual characters within arrays, (b) specific to characters’ position within arrays rather than to characters’ identity, or revealed only under a higher attention load due to (c) low-discriminable characters, and/or (d) characters’ short exposure. Furthermore, in this study we examined whether pure dyslexic participants who do not have attention disorder exhibit a reduced VAS. Although comorbidity of dyslexia and attention disorder is common and the ability to sustain attention for a long time plays a major rule in the visual recognition task, the presence of attention disorder was neither evaluated nor ruled out in previous studies. Findings did not reveal any differences between the performance of dyslexic and control participants on eight versions of the visual recognition task. These findings suggest that pure dyslexic individuals do not present a reduced visual attention span. 相似文献
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