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Contribution to thermochemical studies of 0.8[xB_2O_3-(1-x)SiO_2]-0.2Na_2O glasses

Chinese Chemical Letters 2009年第2期20卷 245-249页

作者： a.p.ahoussou J.Rogez A.Yapi V.Mikalean A.Kone Laboratoire de Chimie-physique UFR-SSMTUniversité de Cocody22 BP 582 Abidjan 22Cte d'IvoireFrance Institut des Matériaux de Microélectroniquede Nanoscience de Provence(IM2NP)UMR 6242CNRSUniversité Paul CézanneMarseilleFaculté des Sciences et Techniques de St Jérome13397 Marseille Cedex 20France

Calorimetric measurements in 0.8[xB2O3-（1 - x）SiO2]-0.2Na2O glasses and melts are performed in I-IF calorimetry at 298 K and lead borate calorimetry at 973 K, respectively. Mixing enthalpy is affected by both temperature and composition. At 298 K, the mixing enthalpies are slightly negative and components are miscible at that temperature in the whole composition range. At 973 K, the sign of the mixing enthalpies reflect the tendency to phase separation at silica-rich compositions, which is avoided for kinetic reasons as shown by SEM results. Therefore, one is tempted to consider the quenched 0.8[xB2O3-（1 - x）SiO2-0.20Na2O] glasses and melts as single-phase materials.

关键词： Borosilicate HF calorimetry Lead borate calorimetry Mixing enthalpy

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Influence of alkali mixed effect on the mixing enthalpy in 0.75B_2O_3-0.25[xNa_2O-(1-x)K_2O]glass system

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Chinese Chemical Letters 2008年第10期19卷 1252-1255页

作者： A.Kouyate a.p.ahoussou A.Yapi D.Diabate J.Rogez A.Trokourey Laboratoire de Chimie-physique UFR-SSMTUniversité de Cocody22 BP 582 Abidjan 22Cote d'Ivoire Institut des Matériaux de Microélectroniquede Nanoscience de ProvenceIM2NPUMR 6242CNRSUniversité Paul CézanneMarseilleFaculté des Sciences et Techniques de St Jérme13397 Marseille Cedex 20France

The mixed alkali effect was investigated in the glass system 0.75B2O3-0.25[xNa2O-（1 -x）K20] through thermodynamic properties. The calorimetric measurements were performed in HF solution calorimetry at 298 K. The mixing enthalpy values show non-linear behaviour upon substitution of one alkali ion by another. This thermodynamic non-ideality is caused by the slight variations of distance between metallic cations, the macromolecular structure being unchanged. It can be explained, at least qualitatively, using electrolyte theory based on the Coulombic interactions of charged species originally developed by Debye and Hückel.

关键词： Alkali mixed effect Calorimetry Mixing enthalpy Coulombic interactions

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基于LSTM预测方法研究

基于LSTM预测方法研究

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作者： ahoussou Kouassi Rodrigue 安徽农业大学

学位级别：硕士

Forecasting stock market prices have always been challenging task for many business analyst and *** fact,stock market price prediction is an interesting area of research for *** successful investment,many investors are interested in knowing about the future situation of the *** prediction systems indirectly help traders by providing supportive information such as the future market *** mining techniques are effective for forecasting future by applying various algorithms to *** researchers have contributed in this area of chaotic forecast in their *** many year different method have been used for resolving many problem in this *** this project,we study the problem of stock market forecasting using Recurrent Neural Network(RNN)with Long Short-Term Memory(LSTM).The purpose of this project is to examine the feasibility and performance of LSTM in stock market *** test the performance of the LSTM with other types of *** Neural Network is trained on the stock quotes using the Back propagation Algorithm which is used to predict share market closing *** our work we use different inputs to build our recurrent neural network to see what the impact on the different predictions *** Accuracy of the performance of the neural network is compared with other accuracy of different *** also prove that some algorithm are good for prediction in a short period but not as a long *** our work of prediction prices,we got the data on the site of *** our work we use three different type of *** different types of technique are:the first technique used to calculate the loss error is named The technique of standard Average and the linear regression news.;the second we use is called the technique of Exponential Moving Average,and finally we use the last technique we use is called the long Short Term memory Network or also called(LSTM).After using these different methods we p

关键词： Long Short-Term Memory(LSTM) root mean square error(RMSE) prediction stock prices

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Application of Solution Calorimetry to the prediction of 20.15[(2.038+x)SiO_(2)-(1.457−x)Na_(2)O]-2.6-p_(2)O_(5)-26.95CaO Glass Bioactivity

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Advances in Chemical Engineering and Science 2013年第2期3卷 123-129页

作者： Amadou Kouyate Ange privat ahoussou Jacques Rogez pierre Benigni Laboratoire de Chimie-physique UFR-SSMTUniversitéde CocodyAbidjanCote d’Ivoire Faculte des Sciences et Techniques Campus de Saint-JéromeAix-Marseille UniversitéMarseilleFrance

Bioactive glasses in the system SiO2-Na2O-CaO-p2O5 were prepared by the conventional melting process at a high temperature in an electric furnace. The densities of the glasses as well as their glass transition temperatures were measured experimentally. Also, the glasses were characterized by solution calorimetry at 298 K in an acidic solvent consisting of HF (6 M) and HNO3 (4 M). A simulation of the bioactivity properties of these obtained glasses was carried out by thermodynamic calculations, with the purpose of understanding the in vitro results obtained.

关键词： Bioactive Glass Solution Calorimetry Free Enthalpy of Formation Reaction Number

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