A relativistic continuum Hartree-Bogoliubov theory description of N=3 isotones

The ground-state properties of N=3 isotones and mirror nuclei have been investigated in the Rrelativistic Continuum Hartree-Bogoliubov theory with the NLSH effective interaction. Pairing correlations are taken into account by a density-dependent δ-force. The calculations show that the proton density distributions of ⁸B and ⁹C have a long tail, the core has an increasing tendency of ⁹C and the paired off valence protons make the halo distribution shrink. The cross sections for the ⁸B(⁹C)+¹²C reaction which are consistent with the experimental data are calculated using the Glauber model. On the whole, we think that ⁸B is a one-proton halo nucleus and ⁹C is a two-proton halo nucleus.     

Application of the parametric for mulae for electromagnetic showers in unconverted γ/π~0 discrimination

In the LHC experiment, the neutral pions produced during jet fragmentation are the background sources for all physics channels with high-energy photons in their final state. In this paper, the application of the three-dimensional parametric formula for electromagnetic (EM) showers, which we developed in the Alpha Magnetic Spectrometer II experiment, is presented to distinguish the unconverted photons from the neutral pions. With the constructed electromagnetic calorimeter (ECAL) in a GEANT4 simulation, the parametric formulae were validated and the unconverted γπ⁰ discrimination was performed with the Toolkit for Multivariate Data Analysis (TMVA) package in ROOT for different transverse energies ranging from 15 GeV to 75 GeV, which is the most sensitive region for light Higgs (with mass ～120 GeV) searches with the channel H→γγ. With this discrimination method and the selected transverse energy region, we can reject π⁰ with the efficiency from ～40% (65--75 GeV) to ～90% (15--25 GeV) when keeping 90% γ efficiency.     

Cu／Fe（CN）6^3—／4—界面的动态FT—IR光谱

采用现场FT-IR光谱电化学研究了Cu/Fe(CN)_6~(3-/4-)界面的化学反应、电化学反应及其随电位、时间的变化关系,并从C≡N基振动频率的改变详细分析和讨论了Cu与Fe(CN)_6~(3-/4-)的作用及成膜过程。     

掺镧TiO2纳米薄膜材料的制备与光催化性能研究

用溶胶-凝胶法研究了掺镧TiO_2纳米薄膜材料。在钛醇盐溶液前驱体中,通过提拉方式镀膜在玻璃上,从而形成自净玻璃。论文对不同的掺镧量、不同的聚乙二醇加入量以及不同镀膜次数的TiO_2材料的透光性、光催化降解性分别进行了测试和研究,并对相关机理进行了探讨。研究表明:对于单层膜的TiO_2材料,掺镧与不掺镧对透光性的影响不大,但掺镧后光催化活性大大提高;对于单层膜的TiO_2材料,随着聚乙二醇的增多,透光率整体呈下降趋势,催化活性先增加后减小。对于多层膜的TiO_2材料,随着层数增加,在紫外光区,透光性变化不大,在可见光区,透光性有所下降。在两层膜后,层数的增多对催化活性影响不大。由实验知:在100mL基体溶液中,当掺入0.5gLa(NQ_3)_3·nH_2O,加入0.2g聚乙二醇,镀膜两层时,透光性好且光催化活性也高。     

二元域上线性群的纯数量刻画

本文给出了仅用元的阶之集对二元域上小阶线性群及其自同构群的刻画.指出并纠正了文[5]中的错误.     

Performance of C/C electric double layer capacitors with coal-based active carbon electrodes

Coal-based active carbon was prepared and used as electrodes of electric double-layer capacitors (EDLCs). The performance of EDLCs using active carbon electrodes with different pore structure was studied, including cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. With an increase of sodium hydrate/coal ratio, the pore structure of active carbon is greatly improved, resulting in larger double-layer capacitance. The capacitance of asymmetric EDLC is up to 65.98 F/g. Moreover, it is found that different pore structure of active carbon is necessary for positive and negative electrodes. Asymmetric EDLC not only exhibits high capacitance but also shows excellent charge-discharge performance, suggesting that it is very suitable and promising to design electrode materials for supercapacitors.     

A novel ferroceneylazobenzene self-assembled monolayer on an ITO electrode: photochemical and electrochemical behaviors

A novel ferroceneylazobenzene self-assembled monolayer (SAM) has been constructed on an indium-tin oxide (ITO) electrode via the covalent attachment of 4-(4'-11-ferrocenyl-undecanoxyphenylazo)benzoic acid ( FcAzCOOH) onto a silanized ITO substrate surface and verified by reflectance infrared spectroscopy and water contact angle. Atomic force microscopy (AFM) and cyclic voltammogram (CV) indicated that the FcAzCOOH formed a uniform and reproducible SAM on the ITO electrode with a surface coverage of ca. 1.9 x 10 (-10) mol/cm (2) (87 A (2)/molecule). The reversible photoisomerization behavior of the SAM was characterized by UV-vis spectra. The azo pi-pi* transition band intensity of the SAM gradually decreased with UV (365 nm) irradiation and was almost recovered again when subsequent exposure to ambient room light (400-800 nm). The increased tilt angle of the molecules on the ITO substrate after UV irradiation further confirmed the trans-to- cis isomerization of azobenzene moieties. The CV of the trans- FcAzCOOH modified ITO electrode showed a pair of waves due to redox of the ferrocene groups in the potential range of 0 to +800 mV (vs SCE), and the peak separation of the redox wave became larger after UV irradiation and almost returned to its original value after subsequent exposure to the visible light. Rate-dependent CV curves indicated that the charge transfer rate between the ferrocene species in the SAM and the ITO electrode was slowed down after UV irradiation due to the smaller porosity of the monolayer film and the more compact barrier layer between the redox species and the ITO electrode. It is the first time to directly observe the influence of photoisomerization of the azobenzene moiety on the redox behavior of redox species in the ferroceneylazobenzene-functionalized SAM. The present results provide profound insight into the role of redox microenvironment on electron transfer kinetics and also provide a simple and facile approach to the preparation of photocontrollable electrodes.     

HPLC法测定大鼠盲肠内容物中5-氨基水杨酸的含量

建立高效液相色谱法测定5-氨基水杨酸在大鼠盲肠内容物中的含量.色谱柱为依利特C18柱（Hypersil BDS,200mm×4.6mm,5μm）,流动相为磷酸盐缓冲液（含0.01mol·L^-1四丁基溴化铵,pH 6.6）∶甲醇=75∶25 （V/V）,流速1.0mL·min-1,检测波长240nm.实验结果表明大鼠盲肠内容物中的内源性物质不干扰测定;线性范围为1.0-64.0μg·mL^-1（r=0.9994）;样品日内日间精密度的RSD均小于2％,回收率在99％-101％之间.本法快捷、灵敏、准确,可用于5-氨基水杨酸大鼠盲肠内容物药物浓度的测定.     

二苯基哌嗪磺胺化合物的合成及其抗微生物活性

以乙酰苯胺和4-氯二苯甲酮为起始原料,经多步反应方便而有效地合成了二苯基哌嗪磺胺化合物,所得目标化合物及其中间体的结构经1H NMR、13C NMR、IR、MS谱和元素分析等证实.研究了化合物的体外抗微生物活性,结果表明目标化合物14和16对所测菌株的抗菌活性均优于磺胺.     

铈(Ⅳ)与氟喹诺酮类抗生素相互作用的共振瑞利散射光谱及其分析应用

在pH4.0～5.0的弱酸性介质中,Ce(Ⅳ)能与诺氟沙星(NOR)、环丙沙星(CIP)、培氟沙星(PE)、洛美沙星(LOM)和司帕沙星(SPA)等氟喹诺酮类抗生素(FLQs)反应,并最终形成Ce(HL)(OH)4型的三元混配络合物.此时,仅能引起吸收光谱的微小变化和摩尔吸光系数(ε)的少量提高,但是却能导致共振瑞利散射(RRS)的显著增强,5种体系的最大散射波长均位于381nm附近,并在534nm处出现一个较小的散射峰,散射增强(ΔI)在一定范围内与FLQs的浓度成正比,方法有高灵敏度,对不同的FLQ其检出限(3σ)除SPA(16.0μgmL-1)之外,其余FLQs在1.9～5.3ngmL-1之间.研究了Ce(Ⅳ)与FLQs相互作用对RRS光谱的影响,反应的适宜条件和影响因素,考察了共存物质的影响,表明方法有良好的选择性,可用于某些样品中FLQs的测定.还结合吸收光谱的变化和量子化学计算,讨论了反应机理及散射增强的原因.