Magnetostratigraphic dating of mammalian fossils in Junggar Basin；northwest China

IEECAS SKLLQG

应用生态学的现状与展望

应用生态学是迅猛发展的现代生态学的主体 .寻求解决人口、资源、环境等问题是应用生态学发展的主要动力 .经过 4 0年的发展 ,应用生态学已发展成为一个庞大的学科门类 .应用生态学未来的发展应更多地关注受人类影响和管理的生态系统并将人视为生态系统的组成成分 .应用生态学在当前和今后应给予优先重视的研究领域 ,包括生态系统与生物圈的可持续利用、生态系统服务与生态设计、转基因生物的生态学评价、生物入侵生态学、流行病生态学、生态预报、生态过程及其调控等 .在今后若干年内 ,围绕这些领域 ,可能会出现广泛而活跃的研究热潮以及一些新的特点 .

Temperature sensitivity of soil respiration is affected by prevailing climatic conditions and soil organic carbon content: A trans-China based case study

National Natural Science Foundation of China [30590381]; Knowledge Innovation Program of the Chinese Academy of Sciences [KZCX2YW-432]; International Partnership Project

Reaction Mechanism of Palladium-Catalyzed Silastannation of Allenes by Density Functional Theory

The reaction mechanism of Pd(O)-catalyzed allenes silastannation reaction is investigated by the density functional method B3LYP. The overall reaction mechanism is examined. For the allene insertion step, the Pd-Si bond is preferred over the Pd-Sn bond. The electronic mechanism of the allene insertion into Pd-Si bond to form sigma-vinylpalladium (terminal-insertion) and sigma-allylpalladium (internal-insertion) insertion products is discussed ill terms of the electron donation and back-donation. It is found that the electron back-donation is significant for both terminal- and internal-insertion. During allene insertion into Pd-Si bond, internal-insertion is preferred over terminal-insertion. By using methylallene, the regio-selectivity for the monosubstituted allene insertion into Pd-Si and Pd-Sn bond is analyzed.

Electrically-controlled near-infrared chiroptical switching of enantiomeric dinuclear ruthenium complexes

Enantiomerically pure dinuclear ruthenium complexes with 1,2-dicarbonylhydrazide as a bridging ligand are optically active in the visible and near infrared spectral regions depending on the oxidation states of the metal centers and are useful as an electrochemically driven near infrared chiroptical switch.

Vacuum ultraviolet optical properties of (La,Gd)PO4 : RE3+ (RE = Eu, Tb)

Vacuum ultraviolet excitation spectra of phosphors (La,Gd)PO4:RE3+ (RE = Eu or Tb) and X-ray photoelectron spectra of LaPO4 and GdPO4 are investigated. The vacuum ultraviolet excitation intensity of (La,Gd)PO4:RE3+ is enhanced with the increasing of Gd3+ content, which implies that Gd3+ plays an intermediate role in energy transfer from host absorption band to RE3+. When Gd3+ is doped into LaPO4:Eu, charge transfer band (CT band) begins to shift to higher energy region and the overlap degree of CT band and the host absorption band gets greater with more Gd3+ doped into LaPO4. These results suggest that the dopant (Gd3+) gives an important influence on energy transfer efficiency. The top of LaPO4 valance band is formed by the 2p level of O2-, whereas that of GdPO4 valance band is formed by the 2p level of O2- and the 4f level of Gd3+, showing the differences in band structures between LaPO4 and GdPO4.

高效液相色谱-蒸发光散射检测法测定那保胶囊中黄芪甲苷含量

目的：采用高效液相-蒸发光散射检测器（HPLC-ELSD）法测定藏药那保胶囊中黄芪甲苷的含量。方法：色谱柱为KromasilC_(18)柱（4．6mm×250mm，5μm）；流动相为乙腈-水（36：64）；ELSD（蒸发光散射检测器）检测。结果：黄芪甲苷在1-10μg范围内具良好的线性关系（r=0．999），平均回收率为99．05，RSD为2．48％。结论：该法简便可行，重复性好，适用于那保胶囊的质量控制。

企业综合自动化系统体系结构

阐述了一般综合自动化系统的二维层次体系结构，以及系统的功能、信息、资源、组织四视图在三个层次的内涵及相互关系。

混凝—臭氧氧化预处理垃圾渗滤液的实验研究

利用以水玻璃、硫酸、硫酸铝和废铁屑为原料研制出的聚硅酸硫酸铝铁类混凝剂（PSAFCS），结合臭氧氧化预处理某垃圾填埋场渗滤液。实验结果表明，经过该处理工艺，垃圾渗滤液CODCr去除率达70.6%，BOD5去除率达75.4%，色度去除率为94%，说明该方法是行之有效的。