基于可持续发展综合国力的生态系统服务评价研究——13个国家生态系统服务价值的测算

分析了生态系统服务的内涵 ,探讨了生态系统服务评价的意义 ,对比分析了生态系统服务评价的方法 ,最后测算了澳大利亚、巴西、英国、加拿大、中国、法国、德国、印度、意大利、日本、俄罗斯、南非、美国等 1 3个国家的生态系统服务价值.     

超低频地磁信号谱分析系统研究与实现

针对超低频地磁信号谱的特点,利用MATLAB的数据显示与分析功能,完成了超低频地磁信号谱分析系统,系统共分为数据文件格式化、原始数据显示、数据谱分析三大模块,能够对采集到的数据按指定条件进行批量格式化并显示为二维分布图,同时可以对数据进行傅里叶变换或小波分析,也可以观察其维格纳分布图,实现了与国外同类软件相同的功能;采用本软件,对安阳信号采集站1980年5月12日的数据进行了处理,达到了预期效果.本系统具有自有知识产权,可有效提高地磁研究工作者的研究效率.     

Characterization of PM2.5/PM2.5-10 and source tracking in the juncture belt between urban and rural areas of Beijing

Coarse （PM2.5-10） and fine （PM2.5） atmospheric particulate samples were collected in summer and winter during 2005-2007 in the juncture belt between urban and rural areas of Beijing. Elements, ions, organic/elemental carbon （OC/EC） and polynuclear aromatic hydrocarbons （PAHs） were determined to obtain some latest information about the particulate pollution in the juncture belt of Beijing. Particulate matter levels at this site were high as compared with the levels at other sampling sites in Beijing. Pollution elements, secondary ions and PAHs were enriched in fine particles rather than in coarse particles. An obvious seasonal variation of the chemical composition of PM was observed. Source apportionment results showed that secondary components were the largest mass contributor of PM2.5, accounting for 28%; whereas soil-related sources were the largest contributor of PM2.5-10, explaining about 49% of the total mass. The abnormal levels of soil heavy metals at the electronic waste disassembly site in the upwind villages suggested the potential impact of such activities to the environment.     

Decoration of C60 nanorods with nickel and their magnetic properties

We studied the coating of C60 nanorods with nickel by electroless plating method and investigated their magnetic properties. The morphology and structure of the nickel layer coated on C60 nanorods were characterized by transmission electron microscopy （TEM）, energy-dispersive X-ray spectroscopy （EDX）, X-ray diffraction （XRD） and Raman spectroscopy. The coated nickel is in the form of nano-sized crystals and becomes a continuous layer as reaction time increases. The hysteresis loop shows a super paramagnetic characteristic similar to that of nanometer-sized nickel particle. These results suggest that the average size of nickel particles on C60 rods is below 10 nm. Our study has shown that electroless plating is an efficient and simple method for coating C60 nanorods with nickel.     

Apoptosis induced by titanium dioxide nanoparticles in cultured murine microglia N9 cells

Owing to the rapidly increasing output of nano-scale titanium dioxide （TiO2） particles, their potential risk for central nerve system （CNS） has elicited much concern recently. Microglia is the resident macrophage in CNS and essential for the homeostasis of the CNS microenvironment. They are supposed to response to nanoparticles depositing in the brain tissues. Therefore, we investigated the cytotoxic effects of TiO2 NPs on microglia N9 cells in vitro. Results of propidium iodide/fluorescein diacetate （PI/FDA） double staining and MTT test clearly showed that TiO2 NPs more efficiently affected the viability of microglia N9 cells. Further Hoechst 33258 staining and flow cytometric analysis proved that nano-scale but not normal scale TiO2 induced apoptosis in vitro, These data suggest that TiO2 NPs can elicit apoptosis of N9 cells in vitro and thus present a potential risk for CNS.     

基于非线性频率响应函数的输电线路故障在线监测方法

提出了基于非线性频率特性分析的输电线路状态监测与故障诊断新方法。通过电力载波信号对输电线路进行在线监测,运用非线性频率响应函数对系统固有特性描述的唯一性,建立输电线路不同运行状态的频率响应模式,根据发生故障后传输线频率响应特性的变化,进行故障征兆模式的特征抽取与识别,从而实现输电线路故障的在线监测与诊断。通过对不同故障类型的仿真实验,验证了所提方法的有效性。     

形状形容词“直”的逻辑语义分析

“直”是高频的形状形容词，在传统词汇语义分析的基础上，运用逻辑语义学理论以“直”为个案考察形状形容词“直”在不同分布中的语义结构关系，旨在初步建立汉语形状形容词的逻辑语义模型及理解模式，可以为进一步形式化提供语义信息和知识，从而为中文信息处理的词义分析提供一种新的思路。     

一类三角插值多项式在Hlder度量下的逼近

研究在H lder度量下 ,双周期 (0 ,m)三角插值多项式 (m为偶数 )的逼近与饱和 ,确定了饱和阶与饱和类     

龙胆合理密植及遮阳网对其影响研究

经龙胆田间试验表明：龙胆种植方式以15-20x 8-10cm,每穴2－3株，每平方米180－200株为宜；覆盖遮阳网可明显降低植株发病率，增加龙胆产量，较对照增产为39.97%。