小学生数学交流能力表现的内涵、要素、水平与评价

数学交流能力表现是学生作为学习共同体成员,借助数学文字语言、符号、记号、图形和表达式,通过听、说、读、写的方式表达沟通、分享数学见解和学习体验的行为特征。数学交流能力贯穿小学生数学学习的各个环节,由相关要素构成,在发展过程中体现出一定的差异。细化小学生数学交流能力表现的评价指标,尽量用学生外显、具体和可观察的行为来描述。

Motivations and performance of public to private transactions： An international study

This article deals with the motivations and the different sources of value from public to private transactions in Europe, USA and Asia from 2000 to 2007. We determine eight main motivations （tax savings, incentive realignment, control, free cash flow, growth of prospects, transaction costs, takeover defence and undervaluation）. Then, we evaluate the shareholder wealth by measuring the offered premiums and the CAAR （cumulative average abnormal return）. Finally, we analyse the impact of public to private to the wealth shareholder. The main sources for firms from going private are incentive realignment, free cash flow （mostly for Asia）, the economy of cost transaction and undervaluation. Furthermore, taxation benefit is a source of wealth effects for Asia and family blockholder （for the control hypothesis） is significant for Europe. Premiums and CAAR are the most important for the USA and Asia. The main observation that we have made is that Asia gets the same behavior as the USA.

幼儿园“做中学”科学教育活动的有效开展

要促进幼儿园"做中学"科学教育活动的有效开展,需要教师树立"以幼儿为本"的理念,充分发挥幼儿学习的主动性、积极性、创造性,培养幼儿的学习兴趣和发展幼儿的创造性思维。