铝电解故障诊断的研究现状及发展趋势     

周昊  李界家  李世涛  王奔 《科技广场》2010,(9)

铝电解是一个非线性、多耦合、时变和大时滞过程,受强电场、强磁场、强热场交互干扰,故障发生频繁。本文综述了国内外铝电解故障诊断研究状况,阐述了目前铝电解故障诊断的主要方法和发展趋势,为铝电解故障诊断技术的实用化提供理论依据。  相似文献   

Socioeconomic Implications of Telecommunications Liberalization: India in the International Context     

Ben A. Petrazzini Girija Krishnaswamy 《The Information Society》1998,14(1):3-18

Telecommunications restructuring have evolved differently in Asia and Latin America. While Asian governments have moved cautiously in bringing changes to the sector, Latin American nations have implemented radical ownership and market transformations. The Indian telecommunications reform falls in between these two general regional trends. The choice of a high component of competition, increased private participation, and no privatization of the national carrier set conditions that will trigger unique socioeconomic effects. This article identifies and highlights the likely implications of the Indian reform on key economic and social issues, such as the cost of services, cross-subsidies, network interconnection, private investments, universal services, employment, and the possible rise of an information-intensive economy. It does so by comparing and contrasting the Indian experience with dominant reform strategies elsewhere in the developing world.  相似文献   

Equity in college physics student learning: A critical quantitative intersectionality investigation     

Ben Van Dusen  Jayson Nissen 《科学教学研究杂志》2020,57(1):33-57

We investigated the intersectional nature of race/racism and gender/sexism in broad scale inequities in physics student learning using a critical quantitative intersectionality. To provide transparency and create a nuanced picture of learning, we problematized the measurement of equity by using two competing operationalizations of equity: Equity of Individuality and Equality of Learning. These two models led to conflicting conclusions. The analyses used hierarchical linear models to examine student's conceptual learning as measured by gains in scores on research-based assessments administered as pretests and posttests. The data came from the Learning About STEM Student Outcomes' (LASSO) national database and included data from 13,857 students in 187 first-semester college physics courses. Findings showed differences in student gains across gender and race. Large gender differences existed for White and Hispanic students but not for Asian, Black, and Pacific Islander students. The models predicted larger gains for students in collaborative learning than in lecture-based courses. The Equity of Individuality operationalization indicated that collaborative instruction improved equity because all groups learned more with collaborative learning. The Equality of Learning operationalization indicated that collaborative instruction did not improve equity because differences between groups were unaffected. We discuss the implications of these mixed findings and identify areas for future research using critical quantitative perspectives in education research.  相似文献   

从“5W”模式看科技传播   总被引：5，自引：0，他引：5  

常本瑞  谢瑞东 《图书馆论坛》2000,20(5):19-21

从“５Ｗ”模式探讨获取最佳科技传播效果的途径与方法,以期对我国的科普工作,甚至对充发发挥图书馆传递科学的作用有借鉴意义。  相似文献   

Orientation on branching diagram analysis     

Ben M. Harris 《Studies in Educational Evaluation》1979,5(2):157-161

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A national survey of speech and hearing difficulties in primary school children in Barbados     

Garry Hornby  Ben Stabler  Bruce Alleyne  Glenroy Cumberbatch  & Kaye Sargeant 《British Journal of Special Education》2000,27(4):197-201

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Selection devices for user of an electronic encyclopedia: An empirical comparison of four possibilities     

Daniel Ostroff  Ben Shneiderman 《Information processing & management》1988,24(6)

This study measured the speed, error rates, and subjective evaluation of arrow-jump keys, a jump-mouse, number keys, and a touch screen in an interactive encyclopedia. A summary of previous studies comparing selection devices and strategies is presented to provide the background for this study. We found the touch screen to be the fastest in time, the least accurate but the overall favorite of the participants. The results are discussed and improvements are suggested accordingly.  相似文献   

Executive staffing competencies relating to human resource practices     

Wen-Rong Jerry Ho  Ben M. Harris 《Journal of Personnel Evaluation in Education》1996,10(2):161-172

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Canada's Solution (?) of the Alcohol Problem     

Ben H. Spence 《Religious education (Chicago, Ill.)》2013,108(5-6):474-481

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《国际标准书目著录》及其最新发展   总被引：2，自引：0，他引：2  

顾犇 《国家图书馆学刊》2006,34(3):56-60

《国际标准书目著录》是国际图联主持制订的一套关于文献著录的国际标准,自20世纪70年代产生以来,一直对世界各国编目工作的标准化产生着巨大作用.本文介绍《国际标准书目著录》的历史、现状、修订情况及其在中国的传播,并重点分析某些有待讨论的问题和今后发展的趋势.参考文献6.  相似文献