نتایج جستجو برای: quantitative structure property relationships qspr

تعداد نتایج: 2151093  

Journal: :Energy & Fuels 2021

We present a novel probabilistic mean quantitative structure–property relationship (M-QSPR) method for the prediction of jet fuel properties considering two-dimensional gas chromatography measurements. Fuels are represented as one pseudo-structure that is inferred by weighted average over structures 1866 molecules could be in individual fuel. The allows training models on both data pure compone...

Journal: :caspian journal of chemistry 0
mohammad hossein fatemi chemometrics laboratory, faculty of chemistry, university of mazandaran, babolsar, iran zohreh gharehchahi chemometrics laboratory, faculty of chemistry, university of mazandaran, babolsar, iran

in this work, quantitative structure-property relationship (qspr) approaches were used to predict the redox potential of 42 phenolic antioxidants. the structures of all compounds optimized by the am1 semi-empirical method and then a large number of molecular descriptors were calculated for each compound in the data set. subsequently, stepwise multilinear regression was applied to select the mos...

Journal: :Risk analysis : an official publication of the Society for Risk Analysis 2003
Subhash C Basak Denise Mills Douglas M Hawkins Hisham A El-Masri

In recent years, there has been increased interest in the development and use of quantitative structure-activity/property relationship (QSAR/QSPR) models. For the most part, this is due to the fact that experimental data is sparse and obtaining such data is costly, while theoretical structural descriptors can be obtained quickly and inexpensively. In this study, three linear regression methods,...

Journal: :Molecules 2016
Mohamad Nazri Husin Roslan Hasni Nabeel Ezzulddin Arif Muhammad Imran

A topological index of graph G is a numerical parameter related to G which characterizes its molecular topology and is usually graph invariant. In the field of quantitative structure-activity (QSAR)/quantitative structure-activity structure-property (QSPR) research, theoretical properties of the chemical compounds and their molecular topological indices such as the Randić connectivity index, at...

Journal: :Journal of chemical information and computer sciences 2000
Ovidiu Ivanciuc

Quantitative structure-property relationship (QSPR) and quantitative structure-activity relationship (QSAR) studies use statistical models to compute physical, chemical, or biological properties of a chemical substance from its molecular structure, encoded in a numerical form with the aid of various descriptors. Structural indices derived from molecular graph matrices represent an important gro...

2011
Jie Xu Lei Wang Li Liu Zikui Bai Luoxin Wang

A quantitative structure-property relationship (QSPR) study was performed for the prediction of the absorption maxima of azobenzene dyes. The entire set of 191 azobenzenes was divided into a training set of 150 azobenzenes and a test set of 41 azobenzenes according to Kennard and Stones algorithm. A seven-descriptor model, with squared correlation coefficient (R) of 0.8755 and standard error of...

Journal: :journal of chemical health risks 0
mehdi nekoei department of chemistry, college of basic sciences, shahrood branch, islamic azad university, shahrood, iran

a robust linear quantitative structure-property relationship (qspr) model has been constructed to model and predict the refractivity indices of 101 organic compounds as common halo-derivatives of normal paraffin by application of the structural descriptors combined with multiple linear regression (mlr) method. in the main part of this study, theoretical molecular descriptors were adopted from t...

Mohammad Hossein Fatemi, Zohreh Gharehchahi

In this work, quantitative structure-property relationship (QSPR) approaches were used to predict the redox potential of 42 phenolic antioxidants. The structures of all compounds optimized by the AM1 semi-empirical method and then a large number of molecular descriptors were calculated for each compound in the data set. Subsequently, stepwise multilinear regression was applied to select the mos...

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