上海市大气降水中~(210)Pb、~7Be的变化特征

7Be、210Pb等放射性核素已被广泛应用于区域及全球物质传输途径示踪的研究中。2009年8月到2010年10月在上海市普陀区华东师范大学校园设采样点采集了51场大气降水样品,分析了单次降水事件中7Be和210Pb的含量以及湿沉降通量的变化特征,并对比不同季节的变化特征。结果表明:1)单次降水事件中7Be的浓度变化范围为0.21~5.99 Bq/L,210Pb浓度的变化范围为0.01~0.90 Bq/L。7Be和210Pb的月均浓度具有明显的季节变化特征:7Be的浓度高值出现在冬季,夏季浓度最低;210Pb浓度高值出现在秋、冬季节,夏季浓度最低;7Be/210Pb高值主要出现在春、秋季节。2)7Be、210Pb沉降通量与降水量有一定相关性,但单次降水事件7Be和210Pb浓度与降水量并没有很好的相关性。7Be和210Pb沉降通量存在着较好的相关性,指示7Be、210Pb沉降路径有着较好的一致性。     

Energy performance certification and time on the market

This paper analyzes whether energy performance certificates (EPCs) serve as means to reduce the information asymmetry among market participants during the sale of homes. Using a sample of 876,000 single-family homes in the Netherlands, we examine the impact of EPC adoption on the speed of sale. Our results indicate that energy-rated homes sell faster than non-energy-rated homes, an effect that varies by 7–12 percent depending on model specifications and increases when positive (green) ratings are granted. The information conveyed by these certificates reduces the information asymmetry between buyers and sellers, which helps to reduce the uncertainty of quality.     

全球实施《21世纪议程》的主要进展与趋势

从全球角度对世界环境与发展大会以来《21世纪议程》的主要实施进展进行了总结.分析表明,全球经济实现了大幅增长,在消除贫困、推进城市化、节约集约利用资源等方面取得积极进展,但在有关国际公约和承诺的履行方面尚需付出巨大努力.通过对当前全球可持续发展面临的重大挑战和未来趋势进行的分析,认为当前全球可持续发展主要面临三大挑战,即重大全球性环境问题对人类生存构成的直接威胁加大、发展空间争夺更趋激烈和全球性民生问题凸显;全球可持续发展主要呈现四大趋势,即可持续发展进一步由理念向全球行动转化、全球向绿色发展转型、新兴发展中国家成为全球可持续发展的重要推动力和可持续发展领域国际关系呈现竞争性合作.     

Sand-dust Storm, Population and Environment in Northwest China

Sand-dust storms are the result of the integrated influences of climate, geography, society and human factors. A theoretical framework is built to explain the coherence of population growth, agriculture change and environmental degradation. On the basis of the analysis of the causes of the sand-dust storm in terms of human factors, a discussion will be given to show that these factors are internally consistent with the theoretical framework. After that, it will look at China's Agenda 21 and try to find relevant measures to reduce such large sand-dust storms happening in Northwest China and eventually make this area develop sustainably.     

Human impacts on the terrestrial ecosystem of Fildes Peninsula of King George Island, Antarctica

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面向21世纪的内蒙古地区水资源开发利用

本文着重论述内蒙古自治区２１世纪水资源可持续利用，水在人口增长和经济发展，农业用水量增加趋势，特别随着西部大开发，现有淡水资源有限，水资源利用将变的越来越复杂和昂贵，水资源的开发和管理，必须考虑节水和改善环境以实现经济可持续发展。     

Prenatal diagnosis in a female carrying a deletion close to the duchenne locus

Family studies including the proband are usually needed before a prenatal diagnosis may be performed for Duchenne muscular dystrophy. We report here on prenatal diagnosis in a family where the solitary index case was dead, and where the consultand and her mother were assumed to be carriers by independent evidence. DNA anaylsis revealed that both the consultand and her mother had an X chromosome deleted for DNA material in the Xp21 region. The female fetus also carried the deleted X chromosome.