By using density functional theory G96PW91/6-31+G(3d,2p), the stabilities of series of close heteroboranes and positional isomers have been studied to prognosticate the structures for experiments.

The separation of positional isomers of bromo-alkoxylbenzen with six different polar stationary phase columns was compared.

The positional isomers of nitroaniline were separated well in less than 15 min by using the buffer of extreme pH.

The positional isomers of cresol were resolved by capillary gas chromatography with β-clyclodextnn derivatives as stationary phase.

The electronic structures of the positional isomers of C57X3 and C56X4 (X = B、 N、 P), 234 molecules in all, have been computed on a 5 8 6 micro-computer by means of CNDO/2 method.

Separation of positional isomers of some substituted benzenes with CH-B-15-C-5 as GC stationary phase was studied in this paper.

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.