爱心树

爱心树（艺术天才希尔弗斯坦传世经典） 作者：[美]谢尔·希尔弗斯坦 导读：这是一个由一棵有求必应的苹果树和一个贪求不厌的孩子共同组成的温馨，又略带哀伤的动人故事。爱心树的英文“The Giving Tree”，顾名思义便是牺牲奉献的意思，但它亦是一本述说友谊的书。     

The critical period for second language pronunciation: is there such a thing?

This paper investigates the critical period hypothesis (CPH) for the acquisition of a second language sound system (phonology) in a naturalistic setting. Ten cases of successful late-starters with a native-like Hebrew pronunciation are presented in an effort to determine possible variables that may account for their exceptional accomplishment. The issue of CPH in relation to second language acquisition continues to be disputed among second language researchers.     

Diagnosis of Reading Problems: is there a case?

The argument presented in this paper is that effective instruction of children with reading difficulties relies little on accurate diagnosis either of the apparent cause of the reading problem or the nature of the reading problem. The former argument—that the diagnosis of the underlying cause of the problem is futile—is not new but bears restatement as there is no sign that the practice is abating among certain health professionals. The latter argument—that the diagnosis of the child's relative strengths and weaknesses in reading is also irrelevant to instruction—is more controversial as it contradicts standard educational practice. It is considered that standardised reading tests, if properly administered and interpreted, have a part to play in the identification of children with reading problems, but not in the diagnosis or treatment of such problems. Children with reading difficulties would be better served if more attention were paid to instruction and less to diagnosis.     

Kolb's learning styles and learning preferences: is there a linkage?

Much has been written about the relationships between learning styles and learning preferences with the aim of tailoring teaching methods to the ways that students prefer to learn. This study used a sample of 201 management undergraduates to examine the relationships between Kolb's four learning styles and four learning types, and 12 different learning preferences. Only three significant relationships were found. It is suggested that large individual differences in learning preferences within each style and type, and small differences in learning preference mean scores show that, overall, there are weak linkages between learning styles and learning preferences. It is recommended that researchers control for Type I error rates and present effect sizes when statistically significant relationships are found to prevent chance and trivial findings from influencing educators. It is recommended that educators use a variety of learning methods and encourage students to be receptive to different learning methods rather than try to link specific learning methods to specific learning styles.     

Plagiarism in UK law schools: is there a postcode lottery?

The discussion of issues relating to academic dishonesty in the UK higher education sector has become increasingly intense in recent years and has often been subject to the media spotlight. This study examines the policies, procedures and penalties at law schools across the UK when dealing with allegations of plagiarism. Data were obtained in two stages via questionnaires and structured interviews with members of staff. The considerable degree of diversity which emerges is discussed and the possible implications of such diversity are examined.     

萃取剂中微量有机胺的测定

溶剂萃取法在钨的分离、纯化、富集和回收等方面具有比较明显的优点。而萃取剂[φ(N235)=15%,(φ仲辛醇)=20%,(φ航空煤油)=65%]中有机胺的含量直接关系到钨收率的高低。利用甲基橙与有机胺反应生成黄色络合物,进而用氯仿萃取进行比色测定以监测萃取剂中有机胺的含量,从而保证生产的正常运作。     

萃取剂中微量有机胺的测定

溶剂萃取法在钨的分离、纯化、富集和回收等方面具有比较明显的优点.而萃取剂[ψ（N235）=15%,ψ（仲辛醇）=20%,ψ（航空煤油）=65%]中有机胺的含量直接关系到钨收率的高低.利用甲基橙与有机胺反应生成黄色络合物,进而用氯仿萃取进行比色测定以监测萃取剂中有机胺的含量,从而保证生产的正常运作.