Zirconium-mediated Selective Synthesis of Quinoline Derivatives

A series of quinoline derivatives was obtained in high yields by an efficient one-pot reaction of substituted o-diiodobenzenes with azazirconacyclopentadienes, which were conveniently prepared from one internal alkyne and one nitrile mediated by zirconocene. This proposed synthetic method provides a feasible way to the synthesis of large N-heterocyclic π-conjugated molecules.     

高性能电解水电极催化材料的设计及产品工程

随着市场竞争的加剧,以产品需求为导向精确定制符合需求的化学品成为化学工程研究发展的探索新方向。电解水制氢是生产高纯氢气并转换储存大规模可再生能源的一种有效方法。为实现高效的电-氢气转换效率,高性能的电解水析氢析氧电极是必不可少的。电解水电极材料具有复杂的化学组成及多层次的结构,其中电极表面催化材料的物理化学性质和形貌结构是决定电解水性能的最主要因素。本文结合本课题组在电解水催化方面的研究工作,综述了近几年国内外电解水电极催化材料的最新研究进展,阐述了电解水电极催化材料以反应机理为导向的催化剂设计理论、以产品性能为导向的催化剂设计方法学（包括纳米结构构筑、晶面调控、载体复合、晶相调节、杂原子掺杂、合金化和聚合物表面修饰）及应用,针对化学产品工程的发展与需要,介绍了电解水电极催化材料跨越分子尺度、微纳结构及合成应用的产品设计和产品工程研究的关键科学问题和发展方向。     

非线性退缩抛物型方程弱解的梯度的Holder连续性

本文我们讨论如下的非线性退缩抛物型方程：设为上述方程的弱解．在一些结构性条件下，我们得到△ｕ的Ｈ　ｌｄｅｒ连续性．     

Cu(I)-mediated cycloaddition reaction of zirconacyclopentadienes with fumaronitrile and application for synthesis of monocyano-substituted pentacenes

Cu(I)-mediated reactions of zirconacyclopentadienes with fumaronitrile afforded the corresponding dicyanocyclohexadiene and benzonitrile derivatives in good yields. These products were selectively prepared by controlling the reaction temperature. Furthermore, the reaction was applicable for monocyano-substituted pentacene derivatives.     

Proton/Mg2+ Co-Insertion Chemistry in Aqueous Mg-Ion Batteries: From the Interface to the Inner

Co-insertion of protons happens widely and enables divalent-ion aqueous batteries to achieve high performances. However, detailed investigations and comprehensive understandings of proton co-insertion are scarce. Herein, we demonstrate that proton co-insertion into tunnel materials is determined jointly by interface derivation and inner diffusion: at the interface, hdrated Mg²⁺ has poor insertion kinetics, and therefore accumulates and hydrolyzes to produce protons; in the tunnels, co-inserted/lattice H₂O molecules block the Mg²⁺ diffusion while facilitate the proton diffusion. When monoclinic vanadium dioxide (VO₂(B)) anode is tested in Mg(CH₃COO)₂ aqueous solution, the formation of Mg-rich solid electrolyte interphase on the VO₂(B) electrode and co-insertion of derived protons are probed; in the tunnels, the diffusion energy barrier of Mg²⁺+H₂O is 2.7 eV, while that of the protons is 0.37 eV. Thus, protons dominate the subsequent insertion and inner diffusion. As a consequence, the VO₂(B) achieves a high capacity of 257.0 mAh g⁻¹ at 1 A g⁻¹, a high rate retention of 59.1 % from 1 to 8 A g⁻¹, and stable cyclability of 3000 times with a capacity retention of 81.5 %. This work provides an in-depth understanding of the proton co-insertion and may promote the development of rechargeable aqueous batteries.     

二阶奇异微分方程边值问题正解的存在性

该文通过构造一个特殊的锥,利用锥压缩与锥拉伸不动点定理,研究了一类二阶奇异微分方程边值问题两个正解的存在性,改进了最近的一些结果.     

CONVERGENCE RATES FOR A CLASS OF EVOLUTIONARY ALGORITHMS WITH ELITIST STRATEGY

1 IntroductionOne of tlle fundamental issues about the theory of evolutionary algorithIns is their conver-gence. At present, the theoretical basis about evolutionary computation is still yery wcak['--'],especial1y for the researches into the convergeIlce rates of evolutionary a1gorithm8. Accord-illg to the literature, tllere are few results about the convergence rates[4--9], but this research..area i8 very importallt in both theory and practice. Xu and Li[l0] pointed out that the studyof the…     

Positive solutions for m-point boundary-value problems with one-dimensional p-Laplacian

In this paper, we investigate the existence of positive solutions for a classes of m-point boundary value problems with p-Laplacian. By applying a monotone iterative technique, some sufficient conditions for the existence of twin positive solutions are established.