8-羟基喹啉-5-磺酸金属络合物的荧光特性及其应用研究

本文报道了8-羟基喹啉-5-磺酸的金属络合物在不同条件下的荧光特性,探讨了使用激光-时间分辨技术,建立镁、铝荧光分析方法的可能性.     

First Total Synthesis of (±)-13-Hydroxy-8 (14)-abietene

(±)-13-Hydroxy-8 (14)-abietene, a rare alicyclic diterpene possessing an isopropyl group and a hydroxy group at the C-13 position, was isolated from Solidago missouriensis nutt1. Many diterpenes exhibit significant bioactivities, such as antibacterial. As a part of our synthetic studies on the naturally-occurring diterpenes, we are attemping the synthesis of the rare natural compound. To our knowledge no total synthetic work has been reported yet. In order to study the further relationship b…     

N.N′-双亚香草基乙二胺稀土配合物的制备与性质

N.N′-双亚香草基乙二胺(BVEA)既有香草醛的芳香气味,又有可能与金属离子配位的-OH、-OCH_3、-C=N基团,所以试制和研究BVEA的稀土离子配合物可能在实用上有意义。文献上仅有Pujar关于BVEA的Zn~(2+),Cd~(2+),Hg~(2+)配合物的文章,至今未见到有关BVEA的稀土配合物的研究报道。     

Electrochemical determination of electroinactive guests of β-cyclodextrin at a self-assembled monolayer interface

A novel determination method of electroinactive molecules by means of electrochemical technique is presented. A new self-assembled monolayer containing cyclodextrin (CD) is prepared with mono(6-o-p-tolylsulfonyl)-β-cyclodextrin. Although this derivatization process leads to a β-CD coverage of 10% of a full monolayer, this layer shows an effective host-guest response to ferrocene. The interfacial ferrocene complexation gives a response similar to that expected for a Langmuir adsorption isotherm yielding a stability constant of 4.2 ×104 mol-1· L and a maximum ferrocene coverage of 8.6×10-12 mol/cm2. The redox peak currents of the surface-confined ferrocene decrease upon addition of competing β-CD guest species to the solution, such as m-toluic acid (mTA) and sodium dodecyl sulfonate (SDS). This principle has been used for the determination of the electroinactive molecules, mTA and SDS in the concentration ranges of 0.8-2.7 μmol/L and 5-100 nmol/L, respectively.     

SUBSTITUENT CHEMICAL SHIFT (SCS) AND THE SEQUENCE STRUCTURE OF ETHYLENE-VINYL ALCOHOL COPOLYMERS

Three ethylene-vinyl alcohol copolymers were studied by means of the substituent chemical shift (SCS) method. The SCS parameters of hydroxy (-OH) in two different solvents were obtained: in deuterium oxide/phenol (20/80 W/W ) the parameters are S_1 = 42.77±0.08ppm, S_2 = 7.15±0.06 ppm, S_3 (s)= -4.08±0.02ppm, S_3 (t) =-3.09±0.20ppm,S_4 = 0.48±0.03ppm, S_5 = 0.26±0.05ppm. In o-dichloro-benzen-d_4 S_1(s)=44.79±0.61ppm, S_2=7.40±0.00ppm, S_3(s)=-4.51±0.17ppm, S_3(t)=-3.13 ±0.00 ppm, S_4 =0.63±0.04ppm, S_5=0.36±0.00ppm.Simultaneously the ~(13)CNMR spectra of EVA copolymers were assigned by using the SCS parameters obtained.     

麦克斯韦如何构建力学模型来解释电磁感应和发现位移电流

电磁学的核心就是麦克斯韦方程组,今天它被认为是物理学中最美的方程组之一.本文主要介绍了麦克斯韦当初如何通过构建力学模型来解释电磁感应定律和发现了位移电流,从而完整地发展出了麦克斯韦方程组.     

The three-dimension model for the rock-breaking mechanism of disc cutter and analysis of rock-breaking forces

To study the rock deformation with threedimensional model under rolling forces of disc cutter,by carrying out the circular-grooving test with disc cutter rollingaround on the rock,the rock mechanical behavior underrolling disc cutter is studied,the mechanical model of disccutter rolling around the groove is established,and the theory of single-point and double-angle variables is proposed.Based on this theory,the physics equations and geometricequations of rock mechanical behavior under disc cutters oftunnel boring machine(TBM) are studied,and then the balance equations of interactive forces between disc cutter androck are established.Accordingly,formulas about normalforce,rolling force and side force of a disc cutter are derived,and their validity is studied by tests.Therefore,a newmethod and theory is proposed to study rock-breaking mechanism of disc cutters.     

Ou-Pan不等式的推广形式

Ou-Pan(2010)引入了k阶宽度函数对Chernoff不等式进行了推广,本文受Ou-Pan的启发,给出平面闭凸曲线的一个新的几何不等式,进一步推广了Ou-Pan的结论,同时给等周不等式的证明提供了一种新方法.     

真拟弱几乎周期点和拟正则点

T为紧致度量空间X上的连续映射,M（X）为X上所有Borel概率测度.设x∈X,记Mx（T）为概率测度序列{1n∑n 1i=0δTi（x）}在M（X）中的极限点的集合,其中δx表示支撑集是{x}的点测度.记W（T）和QW（T）分别为T的弱几乎周期点和拟弱几乎周期点集.本文证明,如果（X,T）非平凡且满足specifcation性质,则存在x,y∈QW（T）／W（T）（称为真拟弱几乎周期点）,分别满足μ∈Mx（T）,x∈Supp（μ）和ν∈My（T）,y∈/Supp（ν）,回答了周作领等提出的公开问题.Mx（T）在弱拓扑中是紧致连通集,所以,要么是单点集,要么是不可数集.如果x∈QW（T）／W（T）,则Mx（T）是不可数集.一个自然的问题是,怎么刻画M x（T）是单点集的点x（这时x称为拟正则点）.本文给出M x（T）是单点集的充要条件.