发现式学习与新课程改革

布鲁纳在20世纪60年代以结构主义理论为基础领导了美国的课程改革运动.虽然此次课程改革以失败而告终,但是发现式学习方法及其教学方法的提出却受到了广泛的关注.布鲁纳也曾就发现式学习进行了专门的论述.本文从发现式学习法的特点、作用出发来探求我国目前正在进行的第八轮新课程改革,试图为我国新课程改革中学习、教学方法的改革提供一个新的视角.     

Coincidence and Upgrade： A Typical Case Study of Rural Ecotourism Development

At present, internal rural tourism is at the stage of upgrading and renewing, and ecotourism has been considered to be the main direction. This paper discussed the concepts and criteria of rural tourism and ecotourism, analyzed a typical case of Nongke Village of Chengdu City-being considered to be the first rural tourism site in China, went deep into the problems of the contents and criteria of the development of rural ecotourism, and tried to probe into the principles of the development of rural ecotourism both theoretically and practically so as to understand the rules of the development of rural ecotourism .     

Prenatal diagnosis of partial monosomy 18p(18p11.2→pter) and trisomy 21q(21q22.3→qter) with alobar holoprosencephaly and premaxillary agenesis

A prenatal diagnosis of partial monosomy 18p(18p11.2→pter) and trisomy 21q(21q22.3→qter) in a fetus with alobar holoprosencephaly (HPE) and premaxillary agenesis (PMA) but without the classical Down syndrome phenotype is reported. A 27-year-old primigravida woman was referred for genetic counselling at 21 weeks' gestation due to sonographic findings of craniofacial abnormalities. Level II ultrasonograms manifested alobar HPE and median orofacial cleft. Cytogenetic analysis and fluorescence in situ hybridization (FISH) on cells obtained from amniocentesis revealed partial monosomy 18p and a cryptic duplication of 21q,46,XY,der(18)t(18;21)(p11.2;q22.3), resulting from a maternal t(18;21) reciprocal translocation. The breakpoints were ascertained by molecular genetic analysis. The pregnancy was terminated. Autopsy showed alobar HPE with PMA, pituitary dysplasia, clinodactyly and classical 18p deletion phenotype but without the presence of major typical phenotypic features of Down syndrome. The phenotype of this antenatally diagnosed case is compared with those observed in six previously reported cases with monosomy 18p due to 18;21 translocation. The present study is the first report of concomitant deletion of HPE critical region of chromosome 18p11.3 and cryptic duplication of a small segment of distal chromosome 21q22.3 outside Down syndrome critical region. The present study shows that cytogenetic analyses are important in detecting chromosomal aberrations in pregnancies with prenatally detected craniofacial abnormalities, and adjunctive molecular investigations are useful in elucidating the genetic pathogenesis of dysmorphism. Copyright © 2001 John Wiley & Sons, Ltd.     

金属加工过程中应力状态的分析方法

分析简单地拉伸、压缩和扭转的情况时,应力状态能容易地被确定.但是,实际上在金属加工过程中材料是承受复杂的应力状态,在模具——工件接触面上增加有摩擦力.而且,这些应力和摩擦力一般地沿着接触面变化.准确的计算或预测载荷、力、应力和温度,不但对设计适宜的设备是重要的,而且对研究工艺期间材料的变化过程也是重要的.本文将讨论材料变形过程中所运用的主要分析方法及其优缺点.     

金属探测器的现状与发展前景

目前,随着科学技术的不断发展,犯罪分子和恐怖分子也利用高新技术制造出新式的武器、爆炸物等.各个国家也对安检越来越重视.通道式安检门在整个安检过程中扮演着一个十分重要的角色.目前,在国内这个领域,国外产品占了很大一部分.国内产品与国外产品相比还有一定的技术差距.主要体现在漏报和误报.漏报是因为灵敏度达不到,误报是因为抗干扰能力较差.而国外产品在这方面却有很大的优势,因此很大一部分政府机关、企业、大型活动组织者都倾向于购买国外产品.衡量一个安检门的优势除了误报和漏报两个重要指标外,还有其它一些技术性能,也是衡量一个门质量好坏的重要参数.     

项目决策阶段清洁生产分析方法的研究

企业在建设项目决策时就应该按照清洁生产的原则，从源头控制污染。提出了在项目决策中，应从产品选择、工艺路线选择、主要设备选型和节能降耗4个方面进行清洁生产的分析方法，通过此分析方法的应用，可以避免项目决策中的环境失误和降低企业的环境风险。     

构筑防灾科技学院学生文化体系

文章从四个方面阐释学生文化体系的构成，即重在打基础，鼓励学生个性化发展；培植防灾学院自己的学生文化“精英”；创新与创业是学生文化的闪光点；培育一个好的学生文化的管理环境。做到此四点，就可办一个好的、有特点的、合格的高等学校。本文有的放矢，用事实来说话。