Electricity     

D. P. Sen Gupta 《Resonance》1997,2(10):46-53

In the early years of power generation the alternating voltage from a single coil (with 2 or more parallel paths) wascommutated to convert it to DC. Commutation essentially means reversing the negative polarity of the AC voltage so that the voltage produced does not alternately change, its sign and the current delivered by the generator flows in one direction. The purpose of producing direct current was that it could be used to run motors available in those days and light electric bulbs. AC motors which constitute more than 80% of today’s motors had not been invented at that time.  相似文献   

Accessing the elite figured world of science     

Rachel Chaffee  Preeti Gupta 《Cultural Studies of Science Education》2018,13(3):797-805

This review explores Jackson and Seiler’s “I am smart enough to study postsecondary science: A critical discourse analysis of latecomers’ identity construction in an online forum” by considering the analytic framework for figured worlds guiding this study. We consider the specific affordances of cultural production theory for examining how sociohistorical and cultural discourses of science as elite impact individuals at every level of education. We then extend this discussion by exploring how an informal learning space at a prestigious science museum was designed to explicitly tackle cultural discourses of science as elite that act as barriers to identification with science.  相似文献   

Effect of boundary conditions and convection on thermally induced motion of beams subjected to internal heating     

MALIK Pravin KADOLI Ravikiran GANESAN N. 《浙江大学学报(A卷英文版)》2007,8(7):1044-1052

Numerical exercises are presented on the thermally induced motion of internally heated beams under various heat transfer and structural boundary conditions. The dynamic displacement and dynamic thermal moment of the beam are analyzed taking into consideration that the temperature gradient is independent as well as dependent on the beam displacement. The effect of length to thickness ratio of the beam on the thermally induced vibration is also investigated. The type of boundary conditions has its influence on the magnitude of dynamic displacement and dynamic thermal moment. A sustained thermally induced motion is observed with progress of time when the temperature gradient being evaluated is dependent on the forced convection generated due to beam motion. A finite element method (FEM) is used to solve the structural equation of motion as well as the heat transfer equation.  相似文献   

A Survey of Educational Psychologists’ Views on the Delivery of Behaviour Modification     

P. Coxhead  R. M. Gupta 《Educational studies》1989,15(1):15-22

The survey reported here was principally aimed at exploring the views of practising educational psychologists in the United Kingdom as to their implementation of behaviour modification. Approximately 10‐15 questionnaires were sent to each of 22 Psychological Services randomly selected from the Directory of School Psychological Services and Child Guidance Services. Seventy‐eight questionnaires (nearly 31% of those sent out) were received in time for their contents to be analysed. Two findings of the present survey are that an overwhelming majority of practising educational psychologists do not recommend behaviour modification in its traditional form, and that few educational psychologists believe that traditional behaviour modification can or should be implemented without any adaptation. An interesting, and somewhat unexpected finding, is that a vast majority of the respondents hold somewhat ‘and’ attitudes towards the traditional form of behaviour modification, although more experienced educational psychologists are somewhat less antagonistic.  相似文献   

Effect of herbal drug on serum lipid profile in albino rabbits     

S. B. Sharma  M. Gupta  M. C. Pant 《Indian journal of clinical biochemistry : IJCB》1995,10(2):116-118

Abana, a herbal preparation of Himalaya Drug Co. significantly increases HDL—cholesterol and lowers LDL—cholesterol. Moreover, it antagonises the HDL lowering effect of metoprolol.  相似文献   

ADMINISTRATIVE SATISFACTION AND THE REGULATORY CLIMATE AT PUBLIC UNIVERSITIES   总被引：1，自引：1，他引：0  

Volkwein  James Fredericks  Malik  Shaukat M.  Napierski-Prancl  Michelle 《Research in higher education》1998,39(1):43-63

To what extent do differences in regulatory climate among states influence the satisfaction levels of campus managers? This study first measures the financial, personnel, and academic dimensions of state regulation, and examines the extent to which university and state characteristics have an effect on the regulatory climate and administrative flexibility granted to campuses. Second, the research analyzes the dimensions of managerial satisfaction and tests the hypothesis that the state's regulatory climate exercises an influence on the satisfaction levels of managers who are in functional areas impacted by state control. An array of organizational, individual, and work climate variables is used as controls. Atmospheres of administrative teamwork and interpersonal stress appear to exert the strongest positive and negative influences on administrative satisfaction.

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Students as political actors? Similarities and differences across six European nations     

Rachel Brooks  Achala Gupta  Sazana Jayadeva  Jessica Abrahams  Predrag Lažetić 《British Educational Research Journal》2020,46(6):1193-1209

Drawing on data from students, higher education staff and policymakers from six European countries, this article argues that it remains a relatively common assumption that students should be politically engaged. However, while students articulated a strong interest in a wide range of political issues, those working in higher education and influencing higher education policy tended to believe that students were considerably less politically active than their predecessors. Moreover, while staff and policy influencers typically conceived of political engagement in terms of collective action, articulated through common reference to the absence of a ‘student movement’ or unified student voice, students’ narratives tended not to valorise ‘student movements’ in the same way and many categorised as ‘political’ action they had taken alone and/or with a small number of other students. Alongside these broad commonalities across Europe, the article also evidences some key differences between nation-states, institutions and disciplines. In this way, it contributes to the comparative literature on young people’s political engagement specifically, as well as wider debates about the ways in which higher education students are understood.  相似文献   

Unmasking text plagiarism using syntactic-semantic based natural language processing techniques: Comparisons,analysis and challenges     

Vani K.  Deepa Gupta 《Information processing & management》2018,54(3):408-432

The proposed work aims to explore and compare the potency of syntactic-semantic based linguistic structures in plagiarism detection using natural language processing techniques. The current work explores linguistic features, viz., part of speech tags, chunks and semantic roles in detecting plagiarized fragments and utilizes a combined syntactic-semantic similarity metric, which extracts the semantic concepts from WordNet lexical database. The linguistic information is utilized for effective pre-processing and for availing semantically relevant comparisons. Another major contribution is the analysis of the proposed approach on plagiarism cases of various complexity levels. The impact of plagiarism types and complexity levels, upon the features extracted is analyzed and discussed. Further, unlike the existing systems, which were evaluated on some limited data sets, the proposed approach is evaluated on a larger scale using the plagiarism corpus provided by PAN¹ competition from 2009 to 2014. The approach presented considerable improvement in comparison with the top-ranked systems of the respective years. The evaluation and analysis with various cases of plagiarism also reflected the supremacy of deeper linguistic features for identifying manually plagiarized data.  相似文献   

Innovations in science education: infusing social emotional principles into early STEM learning     

Pamela W. Garner  Nuria Gabitova  Anuradha Gupta  Thomas Wood 《Cultural Studies of Science Education》2018,13(4):889-903

We report on the development of an after-school and summer-based science, technology, engineering, and mathematics curriculum infused with the arts and social emotional learning content (STEAM SEL). Its design was motivated by theory and research that suggest that STEM education is well-suited for teaching empathy and other emotion-related skills. In this paper, we describe the activities associated with the development and design of the program and the curriculum. We provide expert-ratings of the STEAM and social emotional elements of the program and present instructor and participant feedback about the program’s content and its delivery. Our results revealed that infusing the arts and social emotional learning content into science education created a holistic STEM-related curriculum that holds potential for enhancing young children’s interest in and appreciation for science and its applications. The data also suggested that the program was well-developed and, generally well-executed. However, experts rated the STEAM elements of the program more positively than the SEL elements, especially with regard to sequencing of lessons and integration among the lessons and hands-on activities, indicating that program revisions are warranted.  相似文献   

Beyond Epistemological Deficits: Dynamic explanations of engineering students’ difficulties with mathematical sense-making     

Ayush Gupta  Andrew Elby 《International Journal of Science Education》2013,35(18):2463-2488

Researchers have argued against deficit-based explanations of students’ difficulties with mathematical sense-making, pointing instead to factors such as epistemology. Students’ beliefs about knowledge and learning can hinder the activation and integration of productive knowledge they have. Such explanations, however, risk falling into a ‘deficit trap’—substituting a concepts/skills deficit with an epistemological one. Our interview-based case study of a freshman engineering major, ‘Jim,’ explains his difficulty solving a physics problem (on hydrostatic pressure) in terms of his epistemology, but avoids a deficit trap by modeling the dynamics of his epistemological stabilities and shifts in terms of fine-grained cognitive elements that include the seeds of epistemological expertise. Specifically, during a problem-solving episode in the interview, Jim reaches and sticks with an incorrect answer that violates common sense. We show that Jim has all the mathematical skills and physics knowledge he would need to resolve the contradiction. We argue that his difficulty doing so stems in part from his epistemological views that (i) physics equations are much more trustworthy than everyday reasoning, and (ii) physics equations do not express meaning that tractably connects to common sense. For these reasons, he does not view reconciling between common sense and formalism as either necessary or plausible to accomplish. But Jim’s in-the-moment shift to a more sophisticated epistemological stance highlights the seeds of epistemological expertise that were present all along: he does see common sense as connected to formalism (though not always tractably so), and in some circumstances, this connection is both salient and valued.  相似文献