共查询到20条相似文献，搜索用时 593 毫秒
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K. B. Athreya 《Resonance》2007,12(11):22-31
If several objects grow with time the one with the highest rate of growth will dominate the rest over time. In this article this is discussed for three cases: when the number of objects is finite, countably infinite and a continuum. 相似文献
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通过指导学生初步实施研究性课题“生长素类似物对植物生长发育的影响”的活动，学生自己解决了生长素促进植物生长的原理问题，揭开了生长素类似物在抑制根生长的同时是不可能促进茎生长的迷惑，增加了学生的探究兴趣，在培养学生实践能力方面有较好效果。 相似文献
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《International Journal of Educational Development》1999,19(2):111-126
As part of a major study of Ugandan secondary education to support planning for the next 10 years, an Excel spreadsheet-based model for predicting school demands was developed. This allows variables, such as GER, population growth rate, to be changed to see the effects on school enrolments. It differs from other models in that it takes into account the widely varying considerable range of ages per year class of school students at primary and secondary levels in Uganda and the growing age cohorts. 相似文献
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The authors argue that the usefulness and legitimacy of measuring student growth depend upon the purpose for which the scores will be used. The investigator or instructor should not attempt to discriminate among individual students on the basis of gain scores because of the unreliability of such scores. The ranking of students in terms of gains is almost always too unreliable to be useful or defensible. On the other hand, the problem of unreliability creates much less difficulty when one is interested in measuring overall treatment effectiveness or in discriminating among situations rather than individuals. The authors conclude that there are many situations in education in which the measurement of student growth is possible, justifiable, and informative. 相似文献
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熊小江 《闽西职业技术学院学报》2009,11(1)
根据中国统计年鉴的数据,采用中国国有工业企业生产函数模型和经济计量方法,推导中国国有工业企业的税负承担能力;采用中国城镇居民消费函数模型和经济计量方法,推导中国居民的税负承担能力.综合两者及其它因素分析得出结论:今后几年为促使中国经济保持持续增长,中国税收增长速度应保持在7%-12%之间. 相似文献
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