Study on Phase Equilibrium Properties for CO_(2+) Cosolvent Binary Systems

Recently, the application of supercritical fluid technology is very interested, and it is applied in many areas for its special properties. The performance of supercritical fluid (SCF) as a solvent can be greatly affected by addition of an entrainer to the system. An entrainer can be added to a supercritical fluid to enhance its solvent strength and/or selectivity. Critical point data for these dilute supercritical fluid-cosolvent systems are imperative for the design of efficient separation …     

Three New Coumarins from Micromelum integerrimum

Micromelum integerrimum (Rutaceae) is a shrub growing in Yunnan Province. Leaves and barks of this plant have been used for the treatment of dysentery, and arthritis1. Previous researches revealed that this plant contained coumarins2-8. Micromelin, the main chemical constituent of this plant, showed significant inhibition against leukaemia P-388 cell line (T/C 149% at 10 mg/kg) but was inactive in lower doses, and also showed significant activity (T/C 228% at 1.25 mg/kg) against Lewis lung…     

液晶彩色显示

七十年代,液晶显示器(LCD)由于其独具的低电压、低功耗工作特性而得到迅速发展,其中扭曲场效应黑白显示已被广泛应用.近年来,日本、英国、瑞士、西德等国对液晶彩色显示的研究也相当活跃,并在应用于手表电视等方面获得成功. 液晶彩色显示与黑白显示一样,都是利用加电场后液晶分子排列状态发生变化,液晶盒的光学性质也随之变化的原理而构成液晶显示元件的.目前已经开发的液晶彩色显示技术按其工作方式可归为四大类:二色性方式、电控双折射方式、扭曲方式和胆甾方式.它们利用的主要液晶光学性质为:二色性、双折射、选择性反射、圆二色散和旋…     

H-Bonding Self-assembled Template-directed Synthesis of a Reactive Amide-bridged Ladder Polyvinylsiloxane

Ladder polysiloxanes (LPS) including both oxygen-bridged ladder polysilsesquioxanes (LPSQ) and organo-bridged ladder polysiloxanes (OLPS) are very important materials because of their excellent properties1. Adrianov et al. in 1960 attempted to prepare 1, …     

The Inclusion Interval of Basic Coneigenvalues of a Matrix

In this paper,a compound-type inclusion interval of basic coneigenvalues of(com- plex)matrix is obtained.The corresponding boundary theorem and isolating theorem are given.     

CONSTRUCTION OF SOLUTIONS TO M-D RIEMANN PROBLEMS FOR A2×2 QUASILINEAR HYPERBOLIC SYSTEM

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A Novel Synthesis of (-)-10-epi-α-Cyperone

The eudesmane derivative, (-)-10-epi-α-cyperone 1, is widely used as a chiral starting material for the synthesis of other fused-ring sesquiterpenes1. The first synthetic work was reported by Howe and co-workers via condensation of (+)-dihydrocarvone 2 with 1-diethylaminopentan-3-one methiodide in 32% yield2. Previously, our group reported the synthesis of compound 1 by treating ketone 2 with ethyl vinyl ketone (EVK) directly under different conditions1a, but the yields were not satisfacto…     

交换环上矩阵保逆的模自同态

本文刻划交换环上全矩阵模保矩阵逆的自同态。     

金刚石表面金属化技术

一、问题的提出 金刚右依靠其无以伦比的高硬度以及优良的机械 性能,使得金刚石工具成为加工各种硬质材料所不可 缺少的工具.目前,我国金刚石工具制造业已迅速形成年耗数千万克拉金刚石、种类齐全的新型工业部门. 由于金刚石与一般金属合金之间的界面能很高, 金刚石颗粒不能为一般低熔点会金浸润,可焊性极差. 统观我国制造的各种金属基体的金刚石工具(如钻头、 锯片启轮、砂轮修正工具等),金刚石颗垃仅仅被机械 地镶嵌在金属基体之中,在使用时,金刚石极易脱落. 笔者从大量的实践中估测孕镶式金刚石工具中金刚石 利用率仅为 60%左右,这意味着…