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This paper reports research on the effects of variations in injection velocity and permeability on the heat transfer and flow
through a highly porous medium between two horizontal parallel plates situated at constant distance with constant suction
by the upper plate. Due to this type of variation in injection velocity and in permeability the flow becomes three dimensional.
The governing equations are solved by adopting complex variable notations to obtain the expressions for the velocity and temperature
field. The skin-friction along the main flow direction and rate of heat transfer are discussed with the help of graphs. 相似文献
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The quality of evaluation of essay type answer books involving multiple evaluators for courses with large number of enrollments is likely to be affected due to heterogeneity in experience, expertise and maturity of evaluators. In this paper, we present a strategy to detect anomalies in evaluation of essay type answers by multiple evaluators based on the relationship between marks/grades awarded and symbolic markers, opinionated words recorded in answer books during evaluation. Our strategy is based on the results of our survey with evaluators, analysis of large number of essay type evaluated answer books and our own experiences regarding grievances of students regarding marks/grades. Results of both survey and analysis of evaluated answer books identified underline, tick and cross as frequently used markers compared to circle and question mark. Further, both opinionated words and symbolic markers identified through the survey are used by evaluators to express either positive or negative sentiments. They have differential usage pattern of these symbols as single evaluator and as one amongst multiple evaluators. Tick and cross have well define purposes and have strong correlation with marks awarded. However, the underline marker is being used for dual purpose of expressing both correctness and incorrectness of answers. Our strategy of inconsistency detection first identifies outliers based on the relationship between marks/grades awarded and number of symbols and/or opinionated words used in evaluation. Subsequently, marks and number of symbolic markers of outliers are compared with peer non-outlier answer books having same marks but different number of markers used. Such outlier answer books are termed as anomalous. We discovered 36 anomalies out of total 425 evaluated answer books. We have developed a prototype tool to facilitate online evaluation of answer book and to proactively alert evaluators of possible anomalies. 相似文献
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Physical discipline and children's adjustment: cultural normativeness as a moderator 总被引：2，自引：0，他引：2
Lansford JE Chang L Dodge KA Malone PS Oburu P Palmérus K Bacchini D Pastorelli C Bombi AS Zelli A Tapanya S Chaudhary N Deater-Deckard K Manke B Quinn N 《Child development》2005,76(6):1234-1246
Interviews were conducted with 336 mother-child dyads (children's ages ranged from 6 to 17 years; mothers' ages ranged from 20 to 59 years) in China, India, Italy, Kenya, the Philippines, and Thailand to examine whether normativeness of physical discipline moderates the link between mothers' use of physical discipline and children's adjustment. Multilevel regression analyses revealed that physical discipline was less strongly associated with adverse child outcomes in conditions of greater perceived normativeness, but physical discipline was also associated with more adverse outcomes regardless of its perceived normativeness. Countries with the lowest use of physical discipline showed the strongest association between mothers' use and children's behavior problems, but in all countries higher use of physical discipline was associated with more aggression and anxiety. 相似文献
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Amrita Chaudhary Pradeep Kumar Vandana Rai 《Indian journal of clinical biochemistry : IJCB》2021,36(3):257
Catechol-O-methyl transferase (COMT) enzyme catalyzes the metabolism of dopamine and other catechols in the brain. Several articles investigated catechol-O-methyltransferase (COMT) Val158Met polymorphism as risk factor for alcohol dependence (AD) but the results were inconclusive. The aim of present meta-analysis was to evaluate the association of Val158Met (COMT) polymorphism with AD. Authors performed keyword search of the 4 electronic databases—Pubmed, Google Scholar, Springer Link and Science Direct databases up to December 31, 2019. Total eighteen studies that investigated the association of Val158Met polymorphism with AD were retrieved. The pooled results from the meta-analysis (2278 AD cases and 3717 healthy controls) did not show association with AD using all 5 genetic models (allele contrast model: OR = 1.02, 95% CI = 0.90–1.14, p = 0.03; homozygote model: OR = 1.06, 95% CI = 0.81–1.38, p = 0.69; dominant model: OR = 0.99, 95% CI = 0.85–1.14, p = 0.87; co-dominant model: OR = 0.97, 95% CI = 0.86–1.11, p = 0.71; recessive model: OR = 1.05;95% CI = 0.85–1.29, p = 0.61). Results of subgroup analysis showed that Val158Met is not risk for AD in Asian and Caucasian population. In conclusion, COMT Val158Met is not a risk factor for alcohol dependence. 相似文献
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肖俊洪 《中国远程教育(综合版)》2004,(7):29-32
[译者按]本文原文发表于"学习联邦"(Com-monwea]th of Learning)网站<知识系列>(Know]-edge Series)栏目(2003年).学习联邦是英联邦各成员国的政府首脑倡议成立的政府间组织,其宗旨是鼓励开发和共享开放学习和远程教育的知识、资源和技术.目前我国远程教育机构也正在开展各种形式的协作,既有电大之间的协作,也有电大与其他教育机构的协作,还有国际间的协作,但毕竟一切刚刚起步,许多地方有待于进一步完善.因此,我们认为这篇经验之谈的文章所提出的一些原则、建议、指南等对我们有一定指导意义和借鉴价值.现将其译成中文,以飨读者,并向印度甘地国立开放大学Sharma高级讲师和Chaudhary教授以及学习联邦组织致谢! 相似文献
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This paper estimates the impact of the Michigan school finance reform, Proposal A, on education inputs and test scores. Using a difference-in-difference estimation strategy, I find that school districts in Michigan used the increase in educational spending generated through Proposal A to increase teacher salaries and reduce class size to a smaller extent. Then, using the foundation allowance created by Proposal A as an instrument, I estimate the causal effect of increased spending on 4th and 7th grade math scores for two test measures – a scaled score and a percent satisfactory measure – and find positive effects of increased spending on 4th grade test scores. A 60% increase in spending increases the percent satisfactory score by one standard deviation. The positive impact of expenditures on test performance seems largely due to higher teacher salaries. 相似文献
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