NH3在Ni(111)表面化学吸附的理论研究

本文用X_a-DV方法研究了NH_3和其分解中间体NH在Ni(111)表面的化学吸附及与表面的相互作用, 包括结合能、基态能级、电荷转移、成键特性和总态密度。     

硼掺杂多晶金刚石薄膜电极的电化学特性

用循环伏安法和恒电位法研究了硼掺杂多晶金刚石薄膜电极（ＤＦＥ）的若干电化学特性。电极面积４×４ｍｍ＾２。在０．１ｍｏｌ／Ｌ ＫＣｌ，ＮａＮＯ３，ＮａＯＨ和ＫＨ２ＰＯ４＋Ｎａ２ＨＰＯ４（ｐＨ＝６．８６）电解质溶液中电势窗口均为－５００￣＋８００ｍＶ；而在０．１ｍｏｌ／Ｌ ＨＣｌ和Ｈ２ＳＯ４溶液中电势窗口为－２００￣＋１１００ｍＶ．Ｋ３Ｆｅ（ＣＮ）６的氧化峰电位为＋５００ｍＶ，与Ｐｔ电极测量相同；校正     

柠檬酸在D354树脂上的动态交换过程

在３５℃下，实验测定了柠檬酸溶液在Ｄ３５４树脂固定床离子交换柱中的穿透曲线，研究了进口浓度、进口流速及柱高对穿透曲线的影响。用简单线性推动力模型描述固定床动态过程，考察了轴向返混对穿透曲线的影响，并从穿透曲线回归得到总传质系数，模型计算值与实验数据符合良好。同时还研究了用强酸顶替法洗脱柠檬酸。     

锂皂石修饰碳糊电极测定痕量铜的研究

报道了锂皂石修饰碳糊电极测定痕量铜，在含０．００１ｍｏｌ／Ｌ ＫＣｌ Ｃｕ＾＋２的试液中，开路富集后介质交换到０．０５ｍｏｌ／Ｌ ＫＣｌ中，用微分脉冲伏安法测定，检测限为７．０ｎｇ／ｍＬ。常见阳离子基本不干扰，可不经预先分离直接测定精金矿中铜的含量，结果良好。还探讨了Ｃｕ＾＋２在锂皂石修饰碳糊电极上的反应机理。     

Enhanced Photocatalytic Hydrolysis Performance of Chiral Molecule Loaded Titanium Disulfide Nanosheets

The photoelectrochemical (PEC) water decomposition is a promising method to produce hydrogen from water. To improve the water decomposition efficiency of the PEC process, it is necessary to inhibit the generation of H₂O₂ byproducts and reduce the overpotential required by cheap catalysts and a high current density. Studies have shown that coating the electrode with chiral molecules or chiral films can increase the hydrogen production and reduce the generation of H₂O₂ byproducts. This is interpreted as the result of a chiral induced spin selectivity (CISS) effect, which induces a spin correlation between the electrons that are transferred to the anode. Here, we report the adsorption of chiral molecules onto titanium disulfide nanosheets. Firstly, titanium disulfide nanosheets were synthesized via thermal injection and then dispersed through ultrasonic crushing. This strategy combines the CISS with the plasma effect caused by the narrow bandgap of two-dimensional sulfur compounds to promote the PEC water decomposition with a high current density.     

High performance liquid chromatography coupled on-line to capillary electrophoresis with laser-induced fluorescence detection for detecting inhibitors of Src homology 2 domain-phosphopeptide binding in mixtures

Reversed-phase HPLC was coupled on-line to a rapid, competitive affinity probe capillary electrophoresis (APCE) assay to screen mixtures for compounds that inhibit protein-ligand interactions. The Fyn Src homology 2 (SH2) domain and its phosphopeptide binding partner were used as a model interaction for demonstration of this technique. In the method, mixtures containing possible inhibitors of binding were separated by HPLC at a flow rate of 0.3 mL/min. A small portion of effluent was directed to a fluidic tee where it was mixed on-line with Fyn SH2 domain and a fluorescent phosphopeptide ("affinity probe") known to bind selectively to Fyn SH2 domain. Electropherograms of the reaction mixture were collected on-line at approximately 6s intervals using a flow-gated interface to control injections onto the capillary electrophoresis with laser-induced fluorescence system. The resulting electropherograms contained two peaks, one corresponding to the free affinity probe and the other a complex of the affinity probe and Fyn SH2 domain. Compounds that bound the protein were detected as a decrease in the peak height of the complex and an increase in the peak height of affinity probe with relative standard deviations of <5%. The assay was shown to resolve multiple peptidergic inhibitors and selectively detect them within a complex mixture of peptides. Signals were dependent upon both concentration of active peptide and its potency in binding inhibition. Detection limits were in the range of 2-11 microM depending upon the peptide. Common organic solvents used in HPLC were shown to have minimal effect in the on-line measurement up to approximately 60% in the mobile phase.     

Enantioselective Radical Addition/Cross‐Coupling of Organozinc Reagents,Alkyl Iodides,and Alkenyl Boron Reagents

A hybrid transition‐metal/radical process is described that results in the addition of organozinc reagents and alkyl halides across alkenyl boron reagents in an enantioselective catalytic fashion. The reaction can be accomplished both intermolecularly and intramolecularly, providing useful product yields and high enantioselectivities in both manifolds.     

Bredon-Illman cohomology with actions of totally disconnected groups

We study the Bredon-Illman cohomology with local coefficients for a G-space X in the case of G being a totally disconnected, locally compact group. We prove that any short exact sequence of equivariant local coefficients systems on X gives a long exact sequence of the associated Bredon-Illman cohomology groups with local coefficients.     

电子碰撞类氢离子电离非相对论跃迁矩阵元

利用BBK模型,导出了电子-类氢离子碰撞电离跃迁矩阵元的解析形式。出射道用包含三个适当的合流超几何函数,且满足适当的三体库仑边界条件的关联BBK波函数来描述,入射道考虑了入射电子与靶离子的长程库仑相互作用而包括一库仑波。含有四个合流超几何函数在内的跃迁T-矩阵元的六维空间积分已约化为一包含高斯-超几何函数的三维实参数积分。忽略入射电子与靶离子的库仑相互作用时,表示用平面波描述的入射电子与靶离子的碰撞,再取靶离子电荷数Z=1时,表示氢原子的电离;略去排斥因子(α₁₂=0)时,又表示不考虑关联的电离。从而可分析各种情况的电离性质。在目前离子的(e,2e)反应三微分截面实验数据还不具备的情况下,可先提供一些必要的理论结果。进而可广泛地应用于处理散射问题之中。     

组蛋白F1、F2b的核磁共振波谱学-光谱学研究

本文研究了组蛋白、组蛋白F₁和组蛋白F_2b的高分辨核磁共振波谱学和紫外、红外光谱学特征。研究表明,组蛋白、组蛋白F₁和组蛋白F_2b三者之间的波谱和光谱存在着显著的差异。