Synthesis and Determination Extinction Coefficient of Gold Nanoparticles with Different Sizes and Different Capping Ligands

Synthesis and Determination Extinction Coefficient of Gold Nanoparticles with Different Sizes and Different Capping Ligands

Extinction coefficients of gold nanoparticles with different sizes were determined by Zetasizer particle analyser and UV ndash;vis absorption spectroscopic measurement. Four different types of gold nanoparticles were prepared and studied: citrate-stabilized nanoparticles in two different sizes; ionic liquid-protected gold nanoparticles and CTAB-protected gold nanoparticles. A linear relationship between the logarithms of extinction coefficients and core diameters of gold particles was found ...

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Implementation of TBLT on L2 Learners’ Task Performance at Different Proficiency Levels

Implementation of TBLT on L2 Learners’ Task Performance at Different Proficiency Levels

The present study will investigate the effect of Task Based Language Teaching on accuracy , fluency and complexity of low and high proficiency level Iranian EFL learners. This quasi-experimental study uses two intact classes , one at each level of proficiency , there are 52learners in each proficiency level amp; all of them are male . A pretest is administrated to provide the researcher with the necessary information about the learner rsquo;s knowledge of speaking skills. After pretest the ...

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Fuzzy Sliding-Mode Controller Design for Two 4-D Different Hyperchaotic System

Fuzzy Sliding-Mode Controller Design for Two 4-D Different Hyperchaotic System

This paper presents a fuzzy sliding mode controller for synchronization of two 4-D hyperchaotic systems. This paper describes two 4-D hyperchaotic systems a LU system and a Newton-Leipnik system. A LU system is defined as master system and the Newton-Leipnik system is defined as the slave system. In the controller design, an additional controller is designed using a sliding surface to ensure the sliding motion through the entire state trajectory. The method of designing a fuzzy sliding mode ...

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A novel SVM-GCM model for prediction of surface tension of some ionic liquids at different temperatures

A novel SVM-GCM model for prediction of surface tension of some ionic liquids at different temperatures

In this study, a novel group contribution method (GCM) is developed to predict the surface tension of ionic liquids (ILs) using support vector machine (SVM) algorithms. A data set including 1225 experimental data for 133 ionic liquids collected from various references is used to develop and assess the predictive capability of the model. The data set covers a temperature range of 278.15 through 470.56 K and a surface tension range of 19.15 through 70.30 mN.m-1. It employs a total of 45 ...

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