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enhancing asphaltene precipitation modeling by cubic-PR solid model using thermodynamic correlations and averaging techniques

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Petroleum Science 2020年第1期17卷 232-241页

作者： Aktham e.shoukry Ahmed H.el-Banbi Helmy Sayyouh Petroleum engineering University of WyomingLaramieWYUSA Petroleum Department Faculty of EngineeringCairo UniversityGizaEgypt Petroleum engineering American University in Cairo(AUC)GizaEgypt

Cubic equation-of-state solid models are one of the most widely used models to predict asphaltene precipitation *** parameters are needed to model precipitation under different pressures and temperatures and are usually obtained through tuning with multi asphaltene onset *** the purpose of enhancing the cubic Peng–Robinson solid model and reducing its dependency on asphaltene experiments,this paper tests the use of aromatics and waxes correlations to obtain these thermodynamic *** addition,weighted averages between both correlations are *** averaging is based on reported saturates,aromatics,resins,asphaltene(SARA)fractions,and wax *** the methods are tested on four oil samples,with previously published data,covering precipitation and onset *** proposed wax-asphaltene average showed the best match with experimental data,followed by a SARA-weighted *** new addition enhances the model predictability and agrees with the general molecular structure of asphaltene molecules.

关键词： Asphaltene precipitation Asphaltene onset pressure Asphaltene precipitation modeling Asphaltene thermodynamics Cubic equation of state

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Cytotoxic effect of Chitosan Based Nanocomposite Synthesized by Radiation： In Vitro Liver and Breast Cancer Cell Line

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Journal of Pharmacy and Pharmacology 2018年第4期6卷 305-319页

作者： A. Abaza G. A. Mahmoud e. A. Hegazy M. Amin e shoukry B. elsheikh Nuclear and Radiological Regulatory Authority (eNRRA) Cairo 11762 Egypt National Center for Radiation Research and Technology (NCRRT) Atomic Energy Authority Cairo 11762 Egypt Faculty of Science Al-Azhar University Nasr City Cairo 11371 Egypt

A silver nanoparticle (AgNP) is likely to provide an attractive object for combining a variety of biochemical properties with great therapeutic potential by using radiation. The present study explores the IC 50 value of chitosan-poly (vinyl alcohol) hydrogel (Cs/PVA) and Ag-doped chitosan-poly (vinyl alcohol) (Cs/PVA/Ag) nanocomposite in view of their anticancer application. The aim was to develop (Cs/PVA) based hydrogel synthesized by gamma radiation which could behave both as a nanoreactor for Ag nanoparticle with promising anticancer applications. The (Cs/PVA/Ag) nanocomposite was confirmed by FTIR (Fourier transform infrared) spectroscopy, XRD (X-ray diffraction) and eDX (energy dispersive X-ray) analysis. The anti-cancer activity of the prepared nanocomposites was demonstrated in human liver cancer cell line (HePG2) and breast cancer cell lines (MCF7). It has significant effects against human liver cancer cell line HePG2 compared to breast cancer cell line MCF7. Further quantitative analysis on the molecular and protein levels is still required to confirm the impact of chitosan on genotoxic effect before reaching a final conclusion and starting its biomedical application.

关键词：癌症房间细胞毒素放射乳肝应用程序 gamma

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