一类新的泛圈图

本文所说的图都是简单无向图。未定义的术语和记号参见[2]。设 G=(V,E)的 n 阶图(n≥3),若 G 中含有 Hamilton 圈,则称 G 是 H-图。若G 中含有从3到 n 的所有长度的圈,则称 G 为泛圈图。如下两个定理是众所周知的。定理1 (Ore,1960)。若在 n 阶图 G 中,有uv(?)E(G)(?)d(u) d(v)≥n,则 G 是 H-图。     

利用发射光谱进行常压介质阻挡放电等离子体诊断及其在材料表面改性上的应用(英文)

使用介质阻挡放电光谱诊断装置,对常压介质阻挡放电在材料改性过程中的等离子体发射光谱进行测量,记录和比较了空气、氦气和氩气常压介质阻挡放电等离子体发射光谱,并运用氩元素谱线的相对强度来诊断电子温度等物理参量,以达到对材料表面改性过程的实时监控。工作的结果对常压介质阻挡放电及其在材料改性上的应用具有重要的意义     

AlGaAs/GaAs异质结中的平行电导效应

本文计算了AlGaAs/GaAs异质结在大栅压下,出现“平行电导效应”时的栅压与平行导电层中电荷的关系。由此给出了高电子迁移率晶体管(HEMT)在大栅压时跨导变化的特性,与实验进行了比较,符合较好。 关键词：     

Some studies on mathematical models for general elastic multi-structures

The aim of this paper is to study the static problem about a general elastic multi-structure composed of an arbitrary number of elastic bodies, plates and rods. The mathematical model is derived by the variational principle and the principle of virtual work in a vector way. The unique solvability of the resulting problem is proved by the Lax-Milgram lemma after the presentation of a generalized Korn's inequality on general elastic multi-structures. The equilibrium equations are obtained rigorously by only assuming some reasonable regularity of the solution. An important identity is also given which is essential in the finite element analysis for the problem.     

褪色光度法测定微量硫化物的研究

根据Ｓ＾２－对４－（对磺酸基苯基）－卟啉（ＴＳＰＰ）与铅显色反应的褪色干扰作用，建立了一种测定Ｓ＾２－的新方法，该方法对Ｓ＾２－的检出限为１０μｇ／Ｌ，选择性较好，用于含硫废水中痕量Ｓ＾２－的测定，结果令人满意。     

An X‐shaped π‐conjugated polymer comprising of fluorene units and anthracene units with high efficiency. Synthesis and optical and electrochemical properties

A new X‐shaped π‐conjugated monomer comprising of fluorene units and anthracene units was synthesized, and it was used to fabricate the new X‐shaped π‐conjugated polymers and investigate the properties of the new polymers. Using different molar ratios between such monomer and a fluorene monomer gave three polymers that showed higher absolute PL quantum yields than the linear polyfluorene (PF) in the solid state. After thermal annealing at 200 °C for 4 h, the linear PF showed an additional bathochromic emission at about 550 nm, whereas such red‐shifted emission was fully eliminated for the X‐shaped polymers. The electroluminescent devices based on the X‐shaped polymers with a configuration of ITO/PEDOT:PSS/polymer/LiF/Ca/Al displayed blue emission with low turn‐on voltage and high brightness. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 5616–5625, 2008     

反向Chrystal不等式

利用控制不等式理论建立了三个反向Chrysta l不等式,并给出了若干应用.     

Ytterbium triflate hydrate catalyzed Michael addition and cyclocondensation of α,β-unsaturated ketones with active methylene compounds

Catalyzed by ytterbium(Ⅲ) triflate hydrate [Yb(OTf)3.xH2O], the Michael addition and cycloeondensation of α,β-unsaturated ketones with active methylene compounds to afford the 1,4-adducts and benzo[b]pyran derivatives, respectively were studied.     

关于有限群不可约特征标零点的一点注记

在这篇文章中,我们分类了每一个非线性不可约特征标的零点集最多由$3$个共轭类组成的有限亚交换群的结构.