α—苯基—2—呋喃甲醇的一个还原反应

α—苯基—2—呋喃甲醇与PPh3在CCl4中于40℃反应1h后．得到淡黄色的固体物，加入MeCOOEt溶解，再加咪唑钠反应1h．得2—苄基呋南     

Instructional Investment or Administrative Bloat: The Effects of Charter System Conversion on Resource Allocations and Staffing Patterns

Despite the growing call for local autonomy and flexibility, few scholars have examined the role of school district–level flexibility on resource allocation and staffing patterns. Leveraging the charter system law within the State of Georgia, we utilize a generalized difference-in-differences approach to estimate the impact of flexibility of system-level expenditures and staffing changes. We find evidence of increases in central office spending and staffing post-conversion to a charter system. In addition, we find evidence that local support is replaced by the state-funded supplemental funding.     

凯恩斯和马克思对失业原因分析的比较

凯恩斯和马克思在对资本主义社会失业问题的分析上有一些相同和类似之处.他们对失业原因分析的一个最大差别是,凯恩斯主要是从人的心理以及人的动机所决定的变量关系上去寻找失业的原因;而马克思的观点是,失业是资本主义生产方式本身对资本主义生产施加的一种限制,失业只是一种相对人口过剩.     

浅析英国的"素质教育"

在英国的教育中,课堂教学所体现出的内容非常广泛,它是在课堂教学高度自由化的前提下,在融洽的课堂气氛中,以先进的教学设施为辅助,在师生互动交流中达到教学目标并满足社会需求的。同时,其教育过程高度重视对学生进行社会意识和团队精神的培养。这些教育理念和教育方法为我国开展素质教育提供了值得借鉴的经验。     

中国中小学英语教师资格认证体系构想

本文在介绍、评价和比较美、英、法、德、日等欧美发达国家和我国周边国家的中小学教师资格认证体系,及英美两国测试和教育评估认证机构设立的英语教师资格认证体系的基础上,提出我国应借鉴国际经验,完善中小学英语教师职前教育和在职培训的内容与模式,并建立一套全国统一且具有各省和直辖市特色的中小学英语教师资格准入和在职资格晋级制度。     

四元数空间形式中混合型全拟脐QR-子流形

考查四元数空间形式中混合型全拟脐QR-子流形并研究了四元数空间形式中具有某种条件下的混合型伪脐QR-子流形.进而研究了四元数K(a)ehler流形的QR-子流形,给出了一些有趣的结果.     

英国高校办学模式及思考

悠久的历史、鲜明的特色、深厚的基础、扎实的专业知识、强有力的实践技能锻炼和良好的社会声誉是英国高校的办学魅力所在,我们应该结合国情,借鉴国外的先进经验,优化我国高等教育的办学模式。     

Performance of Montessori and traditionally schooled nursery children on tasks of seriation, classification, and conservation

It was hypothesized that the Montessori curriculum accelerates the acquisition of a number of concrete operational skills. To test this, eighty 4-year-old children were given three Piagetian problems—seriation, classification, and conservation. Half of the subjects were from Montessori schools, and the other half were from more traditional nursery settings. Within each type of school, half of the children were first year and the other half were second year enrollees. Results showed that significantly more Montessori than traditional children seriated and classified objects like concrete thinkers but that there were no differences on the conservation problem. Year of enrollment did not influence performance on any of the tasks. It was concluded that the hypothesis was confirmed and that the failure to find acceleration of conservation performance was due to its advanced nature relative to the other problems and/or the tangential manner in which Montessori exercises deal with the critical concepts that underly it.     

三种贝母核型的比较研究

The present paper deals with a comparative karyotypic study of three species in Fri- tillaria-F. thuncergii Miq., F. anhuiensis S.  . Chen et S. F. Yin and F. hupehensis Hsiao et K. C. Hsia.  The karyotype of F. anhuiensis S. C. Chen et S. F. Yin is first reported.       The karyotypes of the three species of Fritillaria are rather similar, all with K(2n)=24= 2m+2sm+12t+4st+4m (SAT), showing a close interspecific relationship.  They all have two pairs of st chromosomes, one of which is the third chromosome in all the three species studied, but the other is the seventh in F. thunbergii Miq, the eighth in F. anhuiensis S. C. Chen et S. F. Yin, and the fifth in F. hupehensis Hsiao et K. C. Hsia.  It tells us that there are some differences in their karyotypes.  All of the three species possess two pairs of satellite chromosomes with the satellites located on the long arms. A heterochromatic zone is found sometimes on long arms of No. IX chromosome in each species of Fritillaria and on one of No. I chromosomes in both F. thun- bergii Miq. and F. anhuiensis S. C. Chen et S. F. Yin, a chromosome polymorphism occurring between populations of Fritillaria. In addition, three B chromosomes are always found in most root-tip cells of F. hupehensis Hsiao et K. C. Hsiao.