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Fabrication of Curcumin Encapsulated Chitosan-PVA Silver Nanocomposite Films for Improved Antimicrobial Activity

Journal of Biomaterials and Nanobiotechnology 2011年第1期2卷 55-64页

作者： k. Vimala Murali Mohan Yallapu k. varaprasad N. Narayana Reddy S. Ravindra N. Sudhak.r Naidu k. Mohana Raju 不详

The present study explores the in situ fabrication of chitosan-poly(vinyl alcohol)-silver nanocomposite films in view of their increasing applications as antimicrobial pack.ging, wound dressing and antibacterial materials. The reduction of silver ions into silver nanoparticles (AgNPs) is achieved in acidic solution of chitosan (C) and poly (vinyl alcohol) (PVA) using their functional groups (-OH, -COOH, -NH2 groups). The presence of silver nanoparticles in the chito-san-PVA film is confirmed by UV-Vis spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy and X-ray Dif-fraction (XRD) analysis. The Scanning Electron Microscopic (SEM) images illustrate the presence of embedded silver nanoparticles throughout the films. In addition, the formed silver nanoparticles have an average particle size of ~ 16.5 nm as observed by Transmission Electron Microscopy (TEM). The anti-microbial and anti-fungal activity of the chitosan-PVA silver nanoparticle films have demonstrated significant effects against Escherichia coli (E. coli), Pseudomonas, Staphylococcus, Micrococcus, Candida albicans, and Pseudomonas aeruginosa (P. aeruginosa). To improve further their therapeutic efficacy as anti-microbial agents, curcumin encapsulated chitosan-PVA silver nanocomposite films are developed which showed enormous growth inhibition of E. coli compared to curcumin and chitosan-PVA silver nanoparticles film alone. Therefore, the present study clearly provides novel antimicrobial films which are potentially useful in preventing/treating infections.

关键词： Silver Nanoparticles Chitosan Poly(Vinyl Alcohol) Curcumin Wound Dressing Hydrogel

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Optimal allocation of solar photovoltaic distributed generation in electrical distribution network. using Archimedes optimization algorithm

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Clean Energy 2022年第2期6卷 271-287页

作者： varaprasad Janamala k.Radha Rani Department of Electrical and Electronics Engineering School of Engineering and TechnologyCHRIST(Deemed to be University)Bangalore-560074KarnatakaIndia Department of Electrical&Electronics Engineering R.V.R.&J.C.College of EngineeringGuntur-522019Andhra PradeshIndia

This paper proposes to resolve optimal solar photovoltaic(SPV)system locations and sizes in electrical distribution network. using a novel Archimedes optimization algorithm(AOA)inspired by physical principles in order to minimize network.dependence and greenhouse gas(GHG)emissions to the greatest extent *** sensitivity factors are used to predefine the search space for sites,and AOA is used to identify the optimal locations and sizes of SPV systems for reducing grid dependence and GHG emissions from conventional power *** with composite agriculture loads on a practical Indian 22-bus agricultural feeder,a 28-bus rural feeder and an IEEE 85-bus feeder demonstrated the critical nature of optimally distributed SPV systems for minimizing grid reliance and reducing GHG emissions from conventional energy ***,the voltage profile of the network.has been enhanced,resulting in significant reductions in distribution *** results of AOA were compared to those of several other nature-inspired heuristic algorithms previously published in the literature,and it was observed that AOA outperformed them in terms of convergence and redundancy when solving complex,non-linear and multivariable optimization problems.

关键词： solar photovoltaic system electrical distribution network composite load modelling Archimedes optimization algorithm distributed generation

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Analysis of hard turning process： thermal aspects

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Advances in Manufacturing 2015年第4期3卷 323-330页

作者： varaprasad Bhemuni Srinivasa Rao Chalamalasetti Pavan k.mar k.nchada Venk.ta Vinay Pragada GVP School of Engineering (Technical Campus) Rushikonda Visakhapatnam India Department of Mechanical Engineering College ofEngineering (A) Andhra University Visakhapatnam India

In manufacturing sector, hard turning has emerged as a vital machining process for cutting hardened steels. Besides many advantages of hard turning operations, one has to implement to achieve close tolerances in terms of surface finish, high product quality, reduced machining time, low operating cost and environmental friendly characteristics. In the study, three dimensional （3D） computer aided engineering （CAE） based simulation of hard turning by using commercial software DEFORM 3D has been compared to the experimental results of stresses, temperatures and tool forces in machining of AISI D3 and A1SI H13 steel using mixed ceramic inserts （CC6050）. In the following analysis, orthogonal cutting models are proposed, considering several processing parameters such as cutting speed, feed and depth of cut. An exhaustive friction modelling at the tool-work.interface is carried out. Work.material flow around the cut- ting edge is carefully modelled with adaptive re-meshing simulation capability of DEFORM 3D. The process simulations are performed at constant feed rate （0.075 mm/r） and cutting speed （155 m/min）, and analysis is focused on stresses, forces and temperatures generated during the pro- cess of machining. Close agreement is observed between the CAE simulation and experimental values.

关键词： Hard turning Computer aided engineering (CAE) Computational machining Finite element method

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充满活力的新加坡国家图书馆管理局

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国家图书馆学刊 2007年第3期16卷 2-5页

作者：华拉保绍新加坡国家图书馆管理局

华拉保绍先生，1969年毕业于坎特博雷大学，获工学学士学位。1972年获奥克兰大学工学硕士学位，1980年获英国科蓝菲尔德学院哲学博士学位。1985年他在新加坡国立大学任教职，1985年-1990年任新加坡理工学院副院长，1990年-2001年任新加... 详细信息

华拉保绍先生，1969年毕业于坎特博雷大学，获工学学士学位。1972年获奥克兰大学工学硕士学位，1980年获英国科蓝菲尔德学院哲学博士学位。1985年他在新加坡国立大学任教职，1985年-1990年任新加坡理工学院副院长，1990年-2001年任新加坡淡马锡理工学院院长兼总裁，2001年-2004年任新加坡国立大学副校长，2004年到现在，任新加坡国家图书馆管理局总裁。新加坡国家图书馆管理局具有世界先进的管理理念，2007年4月16日，华拉保绍先生一行应邀做客中国国家图书馆“世界图书馆馆长论坛”，本期发表的是总裁先生在论坛上的精彩报告。

关键词：新加坡国立大学中国国家图书馆管理局理工学院图书馆馆长学士学位硕士学位博士学位

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