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Ananth, Antony,Dharaneedharan, Subramanian,Heo, Moon-Soo,Mok, Young Sun Elsevier 2015 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.262 No.-
<P><B>Abstract</B></P> <P>Present study deals with the preparation of differently shaped copper oxide nanomaterials (CuO NMs) using simple, reproducible wet chemical and hydrothermal approach. The influence of polyethylene glycol on the morphological control was also studied. The prepared nanomaterials exhibited new types of surface morphologies such as rice grain-like, needle-like and plate-like. The Fourier transform infrared spectra and the X-ray photoelectron spectra of all the samples showed identical chemical functional groups and did not exhibit the presence of any impurities. They exhibited good stability in the aqueous environment with the zeta potential values between −25 and −27mV. The shape dependent anti-bacterial property of the prepared CuO NMs was evaluated against two Gram-positive bacteria namely <I>Streptococcus iniae</I> and <I>Streptococcus parauberis</I> and two Gram-negative bacteria such as <I>Escherichia coli</I> and <I>Vibrio anguillarum</I>. Among three CuO NMs, the plate-like CuO NMs displayed more powerful antibacterial activity than grain or needle shaped CuO NMs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simple synthesis procedure with good reproducibility. </LI> <LI> Preparation of spherical, rice grain-like, needle-like and plate-like CuO NMs. </LI> <LI> Antimicrobial activity and mechanism. </LI> <LI> Shape dependent performance. </LI> </UL> </P>
A New Combined Homotopy-Laplace Decomposition Method for Solving DDEs of Order (1, 2)
Ananth Kumar S. R.,R. Rangarajan 장전수학회 2018 Advanced Studies in Contemporary Mathematics Vol.28 No.1
In the recent literature, nonlinear problems are solved by two powerful decomposition methods, namely, Laplace decomposition method and Homotopy analysis methods. In the present paper a new method is proposed motivated by the above two methods to solve both nonlinear differential-difference equations and integro-differential-difference equations of order (1, 2).
Analysis of Web Browser Security Configuration Options
( Ananth A. Jillepalli ),( Daniel Conte De Leon ),( Stuart Steiner ),( Jim Alves-foss ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.12
For ease of use and access, web browsers are now being used to access and modify sensitive data and systems including critical control systems. Due to their computational capabilities and network connectivity, browsers are vulnerable to several types of attacks, even when fully updated. Browsers are also the main target of phishing attacks. Many browser attacks, including phishing, could be prevented or mitigated by using site-, user-, and device-specific security configurations. However, we discovered that all major browsers expose disparate security configuration procedures, option names, values, and semantics. This results in an extremely hard to secure web browsing ecosystem. We analyzed more than a 1000 browser security configuration options in three major browsers and found that only 13 configuration options had syntactic and semantic similarity, while 4 configuration options had semantic similarity, but not syntactic similarity. We: a) describe the results of our in-depth analysis of browser security configuration options; b) demonstrate the complexity of policy-based configuration of web browsers; c) describe a knowledge-based solution that would enable organizations to implement highly-granular and policy-level secure configurations for their information and operational technology browsing infrastructures at the enterprise scale; and d) argue for necessity of developing a common language and semantics for web browser configurations.
Laplace decomposition method for solving certain differential-difference equations both of order 1
Ananth Kumar S. R,R. Rangarajan 장전수학회 2013 Advanced Studies in Contemporary Mathematics Vol.23 No.3
In the present paper, exact or approximate solution of certain differentialdifference equations both of order 1 is presented using Laplace decomposition method. The method is motivated by Laplace decomposition methods for solving differential equations and Integro-differential equations available in the recent literature. The aim of this paper is to workout an efficient iterative procedure which produces exact or approximate solution for the present problem in a simple and elegant fashion. This method transforms a first order differential-difference equation with given initial condition into an algebraic equation suitable for applying inverse Laplace transformation resulting a series expression involving unit step functions, representing the solution. The method is implemented on two interesting illustrative examples.
Ananth, Antony,Dharaneedharan, Subramanian,Seo, Hyeon-Jin,Heo, Moon-Soo,Boo, Jin-Hyo Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.322 No.-
<P><B>Abstract</B></P> <P>This manuscript discusses about size and shape-selective preparation of Zinc oxide nanomaterials (ZnO NMs) using simple and handy soft jet plasma source. The soft jet was operated in an atmospheric pressure with low energy consumption and utilized ambient air as a feed gas. The plasma synthesized ZnO NMs exhibited variety of surface morphology such as nanorods, nanosheets and micro-size flowers as compared to the conventional low temperature synthesized powders which showed spherical shape. The precursor concentrations and kinds of precursors were strongly influenced into the NMs morphology and possible growth mechanism in the presence of plasma has been proposed. It is suggested here that the soft jet plasma is an effective tool to control size and shape of ZnO NMs especially when the preparations demanding low temperature, surfactant free and cost-effective synthesis. The prepared ZnO NMs were tested for its shape dependent anti-bacterial property against Gram-positive bacteria namely <I>S. iniae</I> and <I>S. parauberis</I> and two Gram-negative bacteria such as <I>E. coli</I> and <I>V. anguillarum</I>. The flower-like ZnO NMs showed more powerful anti-bacterial activity than rod or sheet-like ZnO structures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Possibility to control surface morphology. </LI> <LI> Low cost, surfactant-free bulk synthesis. </LI> <LI> Proposed growth mechanism. </LI> <LI> Shape dependent anti-bacterial activity. </LI> </UL> </P>
Finite element analysis of shear critical prestressed SFRC beams
Ananth Ramaswamy,Job Thomas 한국계산역학회 2006 Computers and Concrete, An International Journal Vol.3 No.1
This study reports the details of the finite element analysis of eleven shear critical partially prestressed concrete T-beams having steel fibers over partial or full depth. Prestressed concrete T-beams having a shear span to depth ratio of 2.65 and 1.59 and failing in the shear have been analyzed using 'ANSYS', The 'ANSYS' model accounts for the nonlinear phenomenon, such as, bond-slip of longitudinal reinforcements, post-cracking tensile stiffness of the concrete, stress transfer across the cracked blocks of the concrete and load sustenance through the bridging of steel fibers at crack interface. The concrete is modeled using 'SOLID65?eight-node brick element, which is capable of simulating the cracking and crushing behavior of brittle materials. The reinforcements such as deformed bars, prestressing wires and steel fibers have been modeled discretely using 'LINK8'-3D spar element. The slip between the reinforcement (rebar, fibers) and the concrete has been modeled using a 'COMBIN39" non-linear spring element connecting the nodes of the "LINK8' element representing the reinforcement and nodes of the 'SOLID65' elements representing the concrete. The "ANSYS' model correctly predicted the diagonal tension failure and shear compression failure of prestressed concrete beams observed in the experiment. The capability of the model to capture the critical crack regions, loads and deflections for various types of shear failures in prestressed concrete beam has been illustrated.