SOI梯形截面光波导的模式分析

采用有效折射率和转移矩阵理论相结合的方法得到了SOI梯形光波导的本征模方程。计算得到的有效折射率与WKB法相比误差不超过10~(-5)，其垂直方向电场分布与BPM模拟结果基本相符。首次得到了SOI梯形波导的单模曲线和其近似解析表达式，此结果与修正的WKB法一致。

形变双奇核~(178)Ir转动带能级的旋称反转

利用１５２Ｓｍ（３１Ｐ，５ｎγ）１７８Ｉｒ反应产生并研究了双奇核１７８Ｉｒ的高自旋态．实验中进行了１７８Ｉｒ核的在束 γ测量，包括γ射线的激发函数测量、Ｘ－γ和γ－γ符合测量．首次建立了双奇核１７８Ｉｒ基于πｈ９／２νｉ１３／２和πｈ１１／２νｉ１３／２准粒子组态上的转动带能级纲图．发现在低自旋区，两个转动带能级均出现旋称反转．对此核区半退耦带的旋称反转作了简要的分析和讨论．

在核实验仪器中的嵌入式微机选型

简要介绍了在核物理实验设备研制和改进项目中,采用嵌入式微机的必要性和优点。根据系统改进的具体要求,调研并在实验室对几款市场上的嵌入式微机进行了具体性能测试,从而选择了具有超低功耗的x86架构嵌入式微机作为物理实验仪器中的控制器核心部件,并期望在高速数据采集和电控系统中得到应用。

不同海拔长白山岳桦的生理变化

通过分析长白山国家级自然保护区内不同海拔(A1:1700 m,A2:1800 m,A3:1900 m,A4:2000 m,A5:2050 m)梯度岳桦叶片中各种生理指标含量的变化,探讨了林线树木适应高山环境的生理机制。结果表明:随着海拔的升高,比叶面积(SLA)显著减小,A5与A1相比下降了35.90%,差异达到显著水平;叶绿素含量随海拔梯度升高而降低,但叶绿素a/b比值(Chla/Chlb)和Car的相对含量(Car/Chl)随海拔梯度升高而增加;在海拔1900 m左右,MDA含量和MP均处于最低水平,各种酶的活性均为最低;当海拔超过2000 m,接近森林分布的界限时,MDA含量和MP升高,并达到最大值,各种酶的活性都出现了一定程度的下降。综合本次研究表明,在海拔1900 m比较适合岳桦的生长;海拔超过2000 m,岳桦体内生理抗性下降,不利于岳桦的生长发育,因此高海拔限制了岳桦的分布。

Relationship between precipitation and the infiltration depth over the middle and lower reaches of the Yellow River and Yangtze-Huaihe River Valley

National Natural Science Foundation of China [40701021, 40625002, 40331013]; National Knowledge Innovation Program of Chinese Academy of Sciences [KZCX2-YW-315-2]

Studies on the Biotransformation of Arctigenin Using Electrospray Ionization Mass Spectrometry

To study the biotransformation of arctigenin, arctigenin was anaerobically incubated with Eubacterium sp. ARC-2 of human intestinal bacteria in vitro. Arctigenin formed a molecular ion [M-H](-) in negative ion mode. The arctigenin and its metabolites were investigated directly by the electrospray ionization tandem mass spectrometry ion trap and Fourier transform ion cyclotron resonance. Arctigenin was transformed to 4',4 ''-dihydroxylenterolactone by E sp. ARC-2 through 3 types of demethylation products.

Extraction of zinc(II) and cadmium(II) by using mixtures of primary amine N1923 and organophosphorus acids

The extraction of zinc(II) and cadmium(II) from a chloride medium by mixtures of primary amine N1923 and organophosphorus acids [di-(2-ethylhexyl)-phosphoric acid, 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH/EHP), isopropyl phosphonic acid 1-hexyl-4-ethyloctyl ester, bis(2,4,4-trimethylpentyl) phosphinic acid, bis(2,4,4-trimethylpentyl) monothiophosphinic acid, and bis(2,4,4-trimethylpentyl) dithiophosphinic acid] has been studied in the present paper. Results show that only the mixtures of N1923 + HEH/EHP and N1923 + Cyanex272 have synergistic effects on zinc(II), but the other mixtures have no evident synergistic effects. All six mixtures have no evident synergistic effects on cadmium(H). A possible explanation of the different extraction abilities is given based on the structure of the extractants. Furthermore, the possibilities of separating zinc(II) and cadmium(II) with these mixtures are investigated according to the extractabilities. It is possible to separate Zn2+ from bulk cadmium with N1923 and HEH/EHP mixtures and separate Cd2+ from bulk zinc with N1923 and Cyanex301 mixtures.

Blue organic light-emitting diodes based on an oxadiazole-containing organic molecule exhibiting excited state intramolecular proton transfer

A blue organic light-emitting device based on an emissive layer of 2-(2-hydroxyphenyl)-5-phenyl-1,3,4-oxadiazole (HOXD), which exhibits excited state intramolecular proton transfer (ESIPT), was presented. The device had a luminance efficiency of 0.8 cd/A and a maximum brightness of 870 cd/m(2). Our studies indicate that some EL may originate from the triplet excitation state of the enol form of HOXD.

Preparation and luminescent properties of inorganic polymer nano - Structured hybrid films doped with rare earth complexes

The inorganic/polymer hybrid films with good luminescent properties have been obtained by the sol - gel process via incorporating the polymer component doped with rare earth complexes. These films exhibit good toughness and transparency. Their fluorescence spectra and lifetimes indicate that they all have the characteristic luminescence of the central rare earth ions. The lifetimes of these films are longer than those of pure complexes. TEM have showed that the rare earth complexes are dispersed homogeneously in SiO2/PVB interpenetratiny networks, and the dispersed size is between 20 and 30 nn.