中国人口与可持续发展战略

控制人口增长，调整人口结构，提高人口素质是当今中国实现可持续发展的必然选择。这一选择不仅有着深刻的历史原因，而且有着现实的紧迫性。     

国有上市公司董事会结构与公司绩效的实证研究

本文以沪市56家国有上市公司为样本，以国有上市公司的董事会规模、董事会构成以及公司资产规模为解释变量来分析董事会结构与公司绩效之间的关系。结果表明：当国有上市公司资产规模在ll～12．2亿元人民币时，董事会规模的合理区间是8～11人，董事会构成的合理区间是20％～30％，此时，公司的绩效最优；而且，让副董事长兼任公司总经理似乎更好。     

论电子商务与物流的关系

随着电子商务的发展，物流“屏颈”问题越来越突出。本文主要阐述了我国目前的电子商务与物流的关系问题。其中包括物流善电子商务的基础；电子商务影响物流业的发展。     

中西方思维差异与写作风格对比分析

英汉两种语言的写作风格在思维方式、篇章结构、语言特点等方面都存在着很大的差异，本文结合大学英语教学的实践，分析大学生在英语写作中由于受思维负迁移的影响，而普通存在的汉语作文模式现象。我们认为学生只有熟悉并掌握西方思维模式，在用英语进行写作过程中自觉地进行思维转换，才能写出地道的英语作文来。     

姊妹双星探太空

今年年底，中国科学家自主提出的“双星计划”中的两颗探测卫星之一将要升空了。这是我国空间物理探测方面一项重要计划，它与欧空局的“星簇计划”紧密合作，将实现人类第一次对地球空间的六点立体探测。随着日地空间探测和研究的发展，人类将能够预报地球空间的“暴风雨”，无优地遨游太空了。     

实施科学数据共享 增强国家科技竞争力

为了加强我国在日趋激烈的国际竞争中的主动性，加快国家创新体系建设，建立健全国家创新资源共事机制和科技基础条件支撑体系，提高国家科技竞争力，科技部在深入研究和广泛听取专家意见的基础上，向国务院提出了“关于加强科技基础条件平台建设的意见”，并将实施科学数据共事工程，实现科学数据的共事管理与有效使用作为其中的核心内容之一。科学数据作为信息时代一种最基本、影响面最宽的科技创新资源，具有显著的科技推动能力、投资引向价值、应用增值潜力和决策支持作用，它能够从根本上满足科技进步与创新、社会发展、经济增长和国家安全等多种需求，是科技创新基础条件平台的重要组成部分。当前，经济发展的全球化和全球性科技活动不断增强，导致全球范围内对科学数据信息资源的交流、互通和深度使用的强烈需求和高度依赖。面对科技创新国际竞争的严峻挑战，在我国实施科学数据资源的共事机制，发挥科学数据的最大价值，是增强国家科技竞争能力的有效途径，是信息时代全球科技发展的必然选择。     

Holocene lake deposits of Bosten Lake, southern Xinjiang, China

A 9.25-m-long sediment core from Bosten Lake,Xinjiang, provides detailed information about changes in the water budget and biological acticity over the last 8400 cal-endar years. The chronology is constructed from six AMS radiocarbon dates on the terrestrial plant remains. Based onanalyses of TOC, CO3, detrital compounds and biogenic SiO2,lake level fluctuations and periods of remarkably-negative water budget appeared at 8.4-8.2 cal ka, 7.38-7.25 cal ka,5.7-5.5 cal ka, 3.7-3.4 cal ka and 3.3-2.9 cal ka, respec-tively. As they are in-phase with low lake levels at Sumxl Co and Bangong Co in western Tibet Plateau and with paleo-lakes in Inner Mongolia, a climate-induced change to some-what drier and warmer conditions is inferred. A further drop in lake level after 1320 AD of about 200 yr duration may heattributed to a negative water balance prior to the main phase of the Little Ice Age. Deep and stable lake phases of 1500 yr and 1800 yr duration at 7.2-5.7 cal ka and 5.5-3.7cal ka coincide with maximum moisture during the Holocene Megathermai in China. The long term trend towards aridity since about 4.3 cal ka can dearly be recognised. The reduced water budget of Bosten Lake from 640-1200 AD may be attributed to local effects.     

Temperature variations on the Tibetan Plateau over the last two millennia

The paleoclimate data recovered from ice cores,tree rings and lake sediments indicate regional features of cfimatic change on the Tibeta n Plateau (TP) during the last 2000 years. The composite temperature reconstructions in-dicate that several main climatic episodes, such as the “LittleIce Age“ between 1400 and 1900, the “Medieval Warm Pe-riod“ in 1150-1400, a less warm period in 800-1100, and an earlier cold period between the 3rd and 5th centuries,occurred in the TP. In addition, temperature varied from region to region. The period from AD 800 to 1100, which waswarm in northeastern TP, was contemporaneous with cool-ing in the western and southern TP. The southern TP ex-perienced warming between 1150 and 1400. For western TP,the δ^18O records of the Guliya ice core indicate that the pe-Hod 1250-1500 witnessed a clear warming. Large-scaletrends in the temperature history from northeastern TP aremore similar to those in eastern China than are the trendsfrom the Guliya ice cap far to the west and southern TP. The most prominent similarities between the temperature varia-tions of the TP and eastern China are such cold phases as 1100-1150, 1500-1550, 1650-1700 and 1800-1850, andthe latter three cold events match with three widespreadg lacial advances which occurred on the TP during the Little Ice A2e.