尾年金分布的存在性和结构

本文主要是在年金分布的基础上, 推广、定义并研究了一类$r$尾年金分布的存在性和结构, 给出了这类分布的存在性条件, 证明了在一定条件下, $r$尾年金分布是年金分布与某一特殊$r$尾年金分布的混合.     

Self-Assembly of Micro-Parts onto Si Substrates at Liquid-Liquid Interface

We report a new approach for the self-assembly of cuboid micro-parts onto Si substrates to construct three-dimensional microstructures. To perform assembly, the Si substrates are prepared with a deep cavity array as binding sites. An aggregate composed of hundreds of uniformly aligned micro-parts is formed at the C10F18-H2O interface. The micro-parts are arranged by passing the substrate through the aggregate of micro-parts, thus the micro-parts are left on the substrate, and then the substrate is vibrated ultrasonically in the solution, making it possible for the micro-parts to fall into the cavities on the substrate. Finally the substrate is pulled out of the solution after assembly. This technique could give a high yield of up to 70%, providing a new method for micro-assembly.     

Phenylene vinylene‐based electroluminescent polymers with electron transport block in the main chain

We report a new route for the design of soluble phenylene vinylene (PV) based electroluminescent polymers bearing electron‐deficient oxadizole (OXD) and triazole (TZ) moieties in the main chains with the aryloxy linkage. Both series of the PV‐based polymers were prepared by Wittig reaction. By properly adjusting the OXD and/or TZ content through copolymerization, we can achieve an enhanced balance of hole‐ and electron injections, such that the device efficiency is significantly improved. Light‐emitting diodes fabricated from P1, P2, P3, P4, P5, P6, and P7 with the configuration of Indium–Tin Oxide (ITO)/Poly (styrene sulfonic acid) doped poly (ethylenedioxythiophene) (PEDOT)/polymer/Ca/Al, emit bright green light with the maximum peak around 500 nm. For the device using the optimal polymer (P4) as emitting layer, a maximum brightness of 1300 cd/m² at 20 V and a maximum luminance efficiency of 0.325 cd/A can be obtained. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3469–3478, 2006     

Synthesis and application as polymer electrolyte of hyperbranched polyether made by cationic ring‐opening polymerization of 3‐{2‐[2‐(2‐hydroxyethoxy)ethoxy]ethoxymethyl}‐3′‐methyl‐oxetane

A novel cyclic ether monomer 3‐{2‐[2‐(2‐hydroxyethoxy)ethoxy]ethoxy‐methyl}‐3′‐methyloxetane (HEMO) was prepared from the reaction of 3‐hydroxymethyl‐3′‐methyloxetane tosylate with triethylene glycol. The corresponding hyperbranched polyether (PHEMO) was synthesized using BF₃·Et₂O as initiator through cationic ring‐opening polymerization. The evidence from ¹H and ¹³C NMR analyses revealed that the hyperbranched structure is constructed by the competition between two chain propagation mechanisms, i.e. active chain end and activated monomer mechanism. The terminal structure of PHEMO with a cyclic fragment was definitely detected by MALDI‐TOF measurement. A DSC test implied that the resulting polyether has excellent segment motion performance potentially beneficial for the ion transport of polymer electrolytes. Moreover, a TGA assay showed that this hyperbranched polymer possesses high thermostability as compared to its liquid counterpart. The ion conductivity was measured to reach 5.6 × 10^?5 S/cm at room temperature and 6.3 × 10^?4 S/cm at 80 °C after doped with LiTFSI at a ratio of Li:O = 0.05, presenting the promise to meet the practical requirement of lithium ion batteries for polymer electrolytes. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3650–3665, 2006     

HER磁镜上硬X射线和热电子测量

一、引言 磁镜运行中,为了要知道它在电子回旋共振加热(ECRH)下形成热电子的参数,我们测量了硬X射线能谱、硬X射线发射的时间特性、不同磁场强度下形成热电子环的位置、以及热电子的脉冲幅度分布等。 HER是中国科学院等离子体物理研究所简单型磁镜装置,它的几何尺寸是,真空室长     

氧化物担载铑原子簇催化剂的金属载体相互作用的考察——Ⅱ.金属载体非强相互作用

本文用XPS从Rh_4(CO)_(12)在真空条件下的脱羰过程和在氢氧中的还原过程两方面考察了一些非还原性氧化物担载Rh_4(CO)_(12)催化剂的金属载体相互作用,并把这种相互作用称为金属载体非强相互作用(non-strong metal-support interaction,缩写NSMSI).结果表明,铑与一些载体的非强相互作用的顺序是MgO>ZrO_2>γ-Al_2O_3>SiO_2-Al_2O_3≈SiO_2;Rh与载体的非强相互作用形成Rh—O键,使Rh的还原性减弱;形成M—O键是产生NSMSI效应的重要特征;这种相互作用能增加铑羰基物的稳定性,使其在真空中脱羰速率减慢.铑与非还原性氧化物载体间的非强相互作用可用酸-碱机制解释.     

Cu(Ⅱ)与N-(2-羟苄基)-DL-丙氨酸、4，4′-联吡啶三元配合物的合成与晶体结构

近年来，基于金属和有机配体间的配位键合作用来设计和构筑具有多孔结构的超分子体系已成为现代化学、材料科学领域内非常活跃和充满前景的研究主题之一。为实现这目标，探求决定配合物配位几何构型的因素及通过配体的设计来控制配合物的结构已引起化学家们广泛的兴趣。     

铜(Ⅱ)-黄原酸配合物微粒体系的光谱研究及其在废水分析中的应用

采用分光光度法和共振散射光谱法研究了Cu(Ⅱ)-黄原酸配合物微粒体系。该配合物微粒体系在410nm处有一吸收峰,其吸光度与黄原酸浓度在1.0～40×10-5mol/L范围成良好线性关系,检出限(3σ)为0.5×10-5mol/L。据此建立了一个测定废水中黄原酸含量的分光光度法.该法灵敏、简便、快速、准确、重复性好,平均回收率为98%～100%,相对标准偏差RSD为0.9%～1.9%.共振散射光谱研究结果表明,该体系存在Cu(Ⅱ)-黄原酸配合物微粒,该微粒在360nm处存在共振散射效应.     

染料中间体间氨基-N-取代-苯磺酰胺的合成研究

以间氨基苯磺酸为原料，经乙酰化保护氨基，用氯磺酸／氯化亚砜将磺箕转变为磺酰氯，再分别与氨基G酸、吐氏酸、γ－酸、6－氨基－1，3－萘二磺酸、5，6－二氨基－1，3－萘二磺酸胺化缩合，水解去乙酰基，较高收率地合成了间氨基－N－取代－苯磺酰胺类染料中间体。产物结构经元素分析、红外、核磁和质谱确证。     

Chiral Salen Manganese Complex Immobilized on SBA-15： A New Heterogenized Enantioselective Catalyst for the Epoxidation of Alkenes

Jacobsen‘s catalyst was immobilized onto SBA-15 by multi-step grafting, and this heterogenized catalyst exhibited comparable catalytic performance with the corresponding homogeneous counterpart for the epoxidation of alkenes, and the catalyst could be recycled effectively several times.