氟利昂R12及其替代物的分子构型和特征光谱研究

采用密度泛函理论对氟利昂R12及其替代物R134a在B3LYP/6-311G++（d,p）基组水平上进行结构优化和特征光谱计算.首次在该高精度基组下优化得到了R12和R134a的键长、键角和二面角等分子构型参数,且通过进一步的计算,得到了这两种分子的红外光谱和拉曼光谱.其中R12红外光谱的计算结果与美国国家标准局数据库（NIST）提供的实验结果基本吻合,说明了计算结果的准确性.另外通过从头算CIS方法对能量进行计算,得到了R12和R134a的紫外可见吸收光谱.计算结果可为进一步保护大气臭氧提供有用的数据参考.     

金融危机前后基于垂直专业化的中国出口价值份额分析

2008年全球金融危机使中国出口增速放缓,也给中国提升出口贸易的质量效益带来了机会。利用2007年和2010年中国30省区市区域间投入产出表计算了中国和省域以及国外在中国出口中分享的单位出口价值份额。研究结果发现,金融危机后在中国单位出口中,全国分享的经济收益整体有所提升,进一步从省域格局来看,分享中国单位出口经济收益较高的省域主要分布在东部沿海地区,而从出口部门来看,全国带有技术含量的制造业分享的经济收益在2007~2010年增长最多,而依赖资源和劳动力投入的低端产品制造分享的经济收益下降最多,沿海出口大省仍然是分享制造业出口价值份额最主要的地区,地理区位依旧是出口贸易最有利的条件之一。尽快淘汰落后产能,推动产业升级转型,加大科技含量,才能促使“中国制造”尽快完成向“中国智造”转变。     

浙江乐清湾海岸带功能区划分与海洋产业发展

乐清湾为浙江省重点海湾之，资源的多宜性与不同行业开发利用的矛盾冲突是当前海湾可持续发展面I临的主要障碍。本文从乐清湾海岸带地区的自然环境与社会经济条件出发，探讨了开展海岸带功能区划的必要性，提出了区划的基本方案。在分析乐清湾海岸带地区海洋产业发展现状与问题的基础上，运用层次分析法研究了该湾近期海洋产业的发展方向与主导产业。最后，讨论了实现海洋产业协调发展的若干对策与建议。     

Limiting similarity, niche filtering and functional diversity in coastal lagoon fish communities

The fundamental idea behind the study of biodiversity patterns is the presumed connection between the shape of species assemblages and the functional ways in which they are organized, this functional organization referring to how species are related to one another, as competitors or members of a web of interactions and to how species are facing similar environmental constraints. Amongst the different facets of biodiversity, functional diversity is certainly a key for ecosystem processes in coastal areas. However, surprisingly, patterns of functional diversity have received little attention until now. After presenting a common framework linking functional diversity patterns to species coexistence theories, the aim of our study was twofold: (1) to seek assembly rules in brackish lagoon fish communities drove by functional traits. To this aim we used null models to examine the influence of two opposing forces acting on community structure: interspecific competition that might prevent the coexistence of the most similar species, and environmental filters that might result in the most similar species to coexist. (2) To seek relationships between fish functional diversity and environmental gradients, if any. Fish sampling was carried out in two coastal lagoons where stations differ considerably in terms of physicochemical parameters. Using morphological functional traits, functional diversity of fish communities was estimated using two recently published indices as well as a new proposed index. Firstly our study was not able to demonstrate a limitation of similarity in coexisting lagoon fishes due to interspecific competition. Conversely our results support the niche filtering hypothesis preventing species too dissimilar from one another to co-occur at the same station. Secondly, salinity was positively related to the functional diversity of fishes in both lagoons suggesting that within species assemblages near the channel species are less redundant than at stations far from the channel where species tend to be functionally similar (benthic and eating zooplankton).     

N阶中立型泛函微分方程新的振动准则

作者对一类N阶中立型泛函微分方程给出了新的区间振动准则。文中的结果推广和改进了由Lalli等人得到的广义Kamenev型准则及其它已知结果。     

Construction and screening of a functional metagenomic library to identify novel enzymes produced by Antarctic bacteria

A metagenomic fosmid library of approximately 52 000 clones was constructed to identify functional genes encoding cold-adapted enzymes. Metagenomic DNA was extracted from a sample of glacial meltwater,...     

无居民海岛功能定位初探

根据无居民海岛的自然属性和社会属性,考虑到海岛环境的特殊性、资源承载的有限性、空间开发功能的衍生性,以及与国家主体功能区规划和全国海洋功能区划的衔接性,从海岛开发适宜性和海岛可持续保护的角度,研究无居民海岛功能分类方法,构建海岛功能分类评价指标体系,确定海岛功能分类的适宜性评价因子及评价标准,并引入综合评判理论,量化指标因子,构建综合评判模型,在此模型的基础上,借助GIS技术实现无居民海岛功能定位。     

C3、C4作物的光保护机制差异的光谱探测研究

本文设计了大豆(C3作物)和玉米(C4作物)日变化光谱探测试验,提取了太阳光照条件下叶绿素荧光信号和光化学指数PRI。结果表明,首先大豆和玉米叶绿素荧光强度的日变化特征有较大差异,上午大豆的叶绿素荧光比例呈现快速增加的趋势,而玉米的叶绿素荧光未出现增加趋势;其次,下午高温胁迫条件下C3、C4叶绿素荧光光谱比值的变化差异显著,大豆在760nm和688nm波段的叶绿素荧光比值快速增加,而玉米未出现显著变化;最后,研究证实了C3作物中午受到强光抑制出现光合作用"午休"现象,即午后光合恢复后其光合效率快速增加,表现为C3作物的热耗散降低、PRI快速增加,而C4作物无"午休"现象,午后PRI增加较小。本文研究表明,强光和高温环境胁迫下C3、C4作物的叶绿素荧光和热耗散变化特征有较大差异,利用胁迫条件下的多时相、高光谱遥感数据,提取C3、C4作物的叶绿素荧光和PRI,有可能实现C3、C4作物的遥感分类目标。     

Teaching Historical Geographies of American Film Production

Abstract

The geographies of Hollywood are multiple, contradictory, ephemeral and tangible. Our preconceived conceptions of space and place play a dynamic role in what elements we tend to focus on when discussing the cultural industry of American cinema. This essay uses Hollywood as a metaphor for the American film production industry and a historical geography of production as a framework to explore major spatial and structural changes within this industry from its inception to the present. It highlights teaching methods and materials from the course A Geography of Film at Southern Connecticut State University. Mode of production relates to the economic process where capital, labor, knowledge and imagination are blended to produce a culturalized product for consumption. The American film industry is a fine example of the commodification of culture.