Total cross sections (TCSs) for electron scattering from C_3H_6 isomers: propene (C_3H_6) and cyclopropane (c- C_3H_6) have been calculated in 10～300eV employing the semi-empirical additivity rule.

The investigation on isomeric configuration stability of interlinking boranes neo-B_(20)H_(18)~(2-);

Improving the Accuracy of Isomer's PLS Prediction Model in Near Infrared Spect rum Analysis by Subtractive Spectra Technology;

Adopting the Method of Correlation Coefficient to Improve the Accuracy of the Xylene Isomer's Prediction Model;

Vapor-liquid equilibria of TDA isomeric compounds in vacuum and application;

High speed countercurrent chromatography(HSCCC) was successfully used for the separation and preparation of isomeric compounds.

In this work, quantum chemical calculation on some organic phosphonic acids, 2-phosphono-butane-1,2,4-tricarboxylic acid(PBTCA) and its isomeric compounds, which behave as scale inhibitors were carried out by using Density Functional Theory(DFT) methods of Gaussian98 program package, Onsager model was adopted to simulate the solvent effect.

Curing kinetics for two kinds of isomeric compound different proportion BPF-epoxy resin/MeTHPA/DMP-30 system is studied by means of differential scanning calorimetry(DSC)and the extreme value method.

The electrospray ionization-mass spectrometry result showed that it was an isomeric compound of losartan,which had same fragmentation pattern wi.

There are still quite a few difficulties in separating isomeric compounds nowadays.

Twenty isomers of tetrasulfur ions S~+-4 and S~--4 were acquired by means of the molecular model design.

When these isomers are designed, the germanium atoms could be in three-fold, four-fold or five-fold.

We acquired nine P 5 +, P 5 - and P 5 isomers with molecular graphics and then carried out the optimizations with molecular mechanics, PM3 semi empirical and ADF density functional calculations.