冰芯气候环境记录研究：从科学到政策

冰芯是过去气候环境变化信息的重要载体。文章着重阐述了三极(南极、北极和第三极)冰芯研究在揭示过去气候变化、大气温室气体含量变化、太阳活动、火山活动及人类活动等方面所取得的成就,并说明冰芯研究对相关环境政策制定(如含铅汽油禁用政策、温室气体减排政策)的推动作用。建议国家尽快建立冰芯档案储藏库,以拯救冰芯资源,为后世科学研究与国家发展服务。     

两阶段相结合的广义投影类算法

讨论了非线性不等式约束最优化问题，利用一种新的广义投影技术建立问题的一类算法，该算法的初始点可任意选取，且能自动地将初始化和最优化两阶段统一起来。算法不但无需作任何转轴运算，而且只采用ε－约束集内函数梯度确定广义投影阵，方法结构简单，计算量小，具有普遍意义。     

气候变化问题与我国的应对战略

全球气候变化是全球变化的核心问题,已经成为国际环境外交和国家可持续发展中的重大问题之一。我国政府对气候变化及其影响的重视与日俱增,已经确定了解决气候变化问题的基本原则,并初步确立了响应气候变化问题的立场和战略构想。本文从气候变化问题的由来、观测与研究的现状和问题、我国当前的政策和措施等方面,进一步思考应对气候变化影响和国际谈判的战略部署问题,并提出初步对策建议。     

我国化学领域青年科技人才论文产出分析——以前5批青年千人为例

[目的/意义]目前，高层次人才引进已经成为我国提升科研实力的重要举措，考察人才引进后的论文产出情况，有助于掌握人才计划的实施效果。[方法/过程]文章通过Web of Science数据库下载题录信息，借助Bibexcel、CiteSpace和VOSViewer软件对前5批化学领域青年千人引进后发表论文的数量、结构、影响力、合作网络和基金支持情况进行分析。[结果/结论]研究发现，青年千人发表论文总数呈逐年上升趋势，论文平均被引高于化学领域国内和国际平均水平；存在若干已经形成规模的作者合作网络和机构合作网络，机构合作以国内机构合作为主；通过软件分析，青年千人研究的内容可以分为5个主要类别，分别是化学生物学、有机合成化学、新化学能源研究、高分子化学与物理、无机纳米材料；论文获得基金资助的水平高于全国论文项目资助的平均水平。研究提出通过建立合作网络、扩大合作网络规模，增加高影响力期刊发文数量，加强国际合作发表论文等建议提高中国化学研究的国际竞争力。     

Pre-service teachers’ attempts at debating contemporary issues in science education: A case study from Botswana

This paper constitutes an attempt to explore trends, issues and challenges that emerge when three different cohorts of pre-service teachers debate contemporary issues in science education at the University of Botswana. Apart from the author's experience of teaching the course, the impetus for this study also comes from a growing interest in the contemporary literature in the need for teachers who, in the context of globalization and knowledge economy, are ‘self-reforming’ through continually addressing the key issues of their profession. Unfortunately, the current situation is such that this burden of interrogation falls heaviest on teachers, despite their lack of skills in undertaking the task.     

Human dignity within teacher education: A matter of individualism, competitiveness, and strategic rationality

Human dignity is a grand concept that is assumed to play an important role in education. However, no widely accepted universal definition of human dignity exists. The aim of this study was to examine the Discourse of Human Dignity within teacher education, especially with respect to how Swedish teacher educators make meaning of the concept of human dignity. Findings show that four subdiscourses are involved in the Discourse of Human Dignity within teacher education. These discursive constructions are influences by outcomes of, for example, life-science research, and British and/or American media discourses.     

Face-to-face versus computer-mediated discussion of teaching cases: Impacts on preservice teachers’ engagement, critical analyses, and self-efficacy

Two frequently-used discussion protocols were investigated as part of a program to implement teaching cases in undergraduate educational psychology classes designed for preservice teachers. One protocol involved synchronous face-to-face (FTF) discussion of teaching cases, which occurred in class after students had individually completed written case analyses as homework outside of class. The other was asynchronous computer-mediated (CM) discussion taking place outside of class, simultaneous to students’ completion of their written case analyses. Six class offerings of an undergraduate child development course taught by two instructors (three classes by each instructor) were randomly assigned within instructor in a quasi-experimental design to one of the three discussion conditions: FTF, CM, or no discussion of the cases across the semester. Findings indicated that both CM and FTF discussion conditions were associated with positive outcomes relative to the control condition. Both CM and FTF discussion related to higher cognitive–affective engagement with the cases than the control condition; and the CM discussion condition was associated with higher cognitive–affective engagement than FTF discussion. In contrast, FTF discussion, but not CM discussion, was associated with higher-than-control-condition case analysis ability at the end of the semester. Potential explanations for these findings and directions for future research are discussed.     

全球传播进程中我国体育文化再审视

在全球化浪潮的裹挟和冲击下,中国体育文化受到巨大冲击。有必要对我国体育文化在全球传播进程中所面临的具体语境、文化心态、价值冲突与融合等问题进行审视,分析其成因,寻求解决之道。研究表明,体育文化系统要素具有独特性,与全球传播之间存在天然的亲缘关系。体育物质文化、身体文化、制度文化、价值文化四要素相互依存、相互作用,分别从硬实力、显实力、巧实力、软实力等方面构成并完善体育文化系统。认为,体育价值文化决定着体育文化的价值和方向,应克服文化语境差异带来的障碍,把握好价值传播的主旋律,对各种体育要素文化进行创新和改革,才能实现中国体育文化价值在全球化时代的复兴和超越。     

不可压渗流方程解的衰减性

考虑不可压渗流方程,利用半群e^-t（-d）n算子的性质,研究当初值充分小时,方程的解在空间PM^n＋1-2a（Rn）中的整体衰减速率。