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A review on transition metal oxides based photocatalysts for degradation of synthetic organic pollutants

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Journal of Environmental Sciences 2024年第5期139卷 389-417页

作者： Athira Krishnan Anna Swarnalal Divine Das midhina Krishnan viswanathan S.Saji SmAShibli Department of Chemistry Amrita Vishwa VidyapeethamAmritapuriKerala690525India Interdisciplinary Research Center for Advanced materials King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Department of Chemistry University of KeralaKariavattom CampusThiruvananthapuramKerala695581India

This review provides insight into the current research trend in transition metal oxides(TmOs)-based photocatalysis in removing the organic colouring matters from water.For easy understanding,the research progress has been presented in four generations according to the catalyst composition and mode of application,viz:single component TmOs(the firstgeneration),doped TmOs/binary TmOs/doped binary TmOs(the second-generation),inactive/active support-immobilized TmOs(the third-generation),and ternary/quaternary compositions(the fourth-generation).The first two generations represent suspended catalysts,the third generation is supported catalysts,and the fourth generation can be suspended or supported.The review provides an elaborated comparison between suspended and supported catalysts,their general/specific requirements,key factors controlling degradation,and the methodologies for performance evaluation.All the plausible fundamental and advanced dye degradation mechanisms involved in each generation of catalysts were demonstrated.The existing challenges in TmOs-based photocatalysis and how the researchers approach the hitch to resolve it effectively are discussed.Future research trends are also presented.

关键词： photocatalysis Dye degradation Transition metal oxides and composites Supported catalysts Suspended catalysts

A green path to extract carbon quantum dots by coconut water:Another fluorescent probe towards Fe^(3+) ions

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particuology 2021年第5期19卷 251-258页

作者： manoharan preethi Chinnuswamy viswanathan Nagamony ponpandian Department of Nanoscience and Technology Bharathiar UniversityCoimbatore 641046India

In recent years,carbon quantum dots(CQDs)have been of great enthrallment in the fluorescent probe field.Carbon precursors with interesting physicochemical properties may be derived from natural sources.In this research,for the first time,coconut water has been used as a source of carbon to prepare blue fluorescent CQDs without any modification and functionalization.The preparation of CQDs is very simple and cost-effective,when compared with other conventional techniques.The reaction parameters temperature and pH were varied to obtain monodispersed spherical CQDs with an average grain size of ∼5 nm.The CQDs exhibit blue emission with a wavelength of 487 nm with an excitation wavelength of 390 nm and are used for Fe^(3+) ions detection.Fe^(3+) ions have been observed to quench the fluorescence intensity of the CQDs than other heavy metals.In the presence of Fe^(3+) ions,the fluorescent CQDs are quenched due to the interaction of CQDs and Fe^(3+) ions.A spectroscopic result shows that Fe^(3+) ions can be observed within a concentration of 0-700μm,as well as the detection limit is 0.30μm.The CQDs provide a unique pathway for potential application in the environmental monitoring of heavy metal ions.

关键词： Green preparation of CQDs Coconut water Stirrer-assisted technique Detection of metal ions Quenching efficiency Nonfluorescence

Optimizing Service Stipulation Uncertainty with Deep Reinforcement Learning for Internet Vehicle Systems

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Computers, materials & Continua 2023年第3期74卷 5705-5721页

作者： Zulqar Nain B.Shahana Shehzad Ashraf Chaudhry p.viswanathan m.S.mekala Sung Won Kim Department of Information and Communication Engineering Yeungnam UniversityGyeongsan-siKorea Department of Computer Science and Engineering KLEFIndia Department of Computer Engineering Faculty of Engineering and ArchitectureIstanbul Gelisim UniversityIstanbul34310Turkey School of Computer Science and Engineering VIT UniversityVelloreIndia

Fog computing brings computational services near the network edge to meet the latency constraints of cyber-physical System(CpS)applications.Edge devices enable limited computational capacity and energy availability that hamper end user performance.We designed a novel performance measurement index to gauge a device’s resource capacity.This examination addresses the offloading mechanism issues,where the end user(EU)offloads a part of its workload to a nearby edge server(ES).Sometimes,the ES further offloads the workload to another ES or cloud server to achieve reliable performance because of limited resources(such as storage and computation).The manuscript aims to reduce the service offloading rate by selecting a potential device or server to accomplish a low average latency and service completion time to meet the deadline constraints of sub-divided services.In this regard,an adaptive online status predictive model design is significant for prognosticating the asset requirement of arrived services to make float decisions.Consequently,the development of a reinforcement learning-based flexible x-scheduling(RFXS)approach resolves the service offloading issues,where x=service/resource for producing the low latency and high performance of the network.Our approach to the theoretical bound and computational complexity is derived by formulating the system efficiency.A quadratic restraint mechanism is employed to formulate the service optimization issue according to a set ofmeasurements,as well as the behavioural association rate and adulation factor.Our system managed an average 0.89%of the service offloading rate,with 39 ms of delay over complex scenarios(using three servers with a 50%service arrival rate).The simulation outcomes confirm that the proposed scheme attained a low offloading uncertainty,and is suitable for simulating heterogeneous CpS frameworks.

关键词： Fog computing task allocation measurement models feasible node selection methods performance metrics

Free vibration of layered cylindrical shells filled with fluid

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Applied mathematics and mechanics(English Edition) 2016年第6期37卷 803-820页

作者： m.D.NURUL IZYAN K.K.viswanathan Z.A.AZIZ K.pRABAKAR UTm Centre for Industrial and Applied mathematics Ibnu Sina Institute for Scientific & Industrial ResearchUniversiti Teknologi Malaysia Department of mathematical Sciences Faculty of ScienceUniversiti Teknologi Malaysia Department of Electrical and Computer Engineering Pusan National University

The vibration of the layered cylindrical shells filled with a quiescent, incompressible, and inviscid fluid is analyzed. The governing equations of the cylindrical shells are derived by Love＇s approximation. The solutions of the displacement functions are assumed in a separable form to obtain a system of coupled differential equations in terms of the displacement functions. The displacement functions are approximated by Bickley-type splines. A generalized eigenvalue problem is obtained and solved numerically for the frequency parameter and an associated eigenvector of the spline coefficients. Two layered shells with three different types of materials under clamped-clamped （C-C） and simply supported （S-S） boundary conditions are considered. The variations of the frequency parameter with respect to the relative layer thickness, the length-to-radius ratio, the length-to-thickness ratio, and the circumferential node number are analyzed.

关键词： Love＇s shell theory cylindrical shell spline method

Overcoming the challenges of conducting translational research in cell therapy

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Frontiers of medicine 2011年第4期5卷 333-335页

作者： Sowmya viswanathan Armand Keating Cell Therapy program Princess Margaret HospitalUniversity Health NetworkTorontoONM5G 2M9Canada Division of Hematology Department of MedicineUniversity of TorontoTorontoONM5G 2M9Canada

Cell therapy holds promise in addressing a number of unmet medical needs but despite its considerable impetus,faces numerous challenges including support for translational research in this area.Here,we examine the challenges confronting cell therapy research including the limited funding available for translational research partly due to the uncompetitive nature of required validation studies in cell therapy that of necessity are not hypothesis-driven.Other issues include lack of standardization of definitions of cell products,uncertainty regarding optimum preclinical animal models,duplication of efforts to secure regulatory approval and a lack of uniformity of nomenclature for some cell products.Nonetheless,several initiatives to address all of these issues are underway.

关键词： stem cells clinical trials funding animal models standardization common definitions

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SDN在Ip网络演进中的作用

电信科学 2014年第5期30卷 1-13页

作者： mark m.Clougherty Christopher A.White Harish viswanathan Colin L.Kahn 阿尔卡特朗讯首席技术官办公室美国新泽西州莫雷山079740636 阿尔卡特朗讯贝尔实验室美国新泽西州莫雷山079740636

Web已经改变了一切。新的服务每天都在出现,并且有些服务一夜之间就能够获得巨大的用户量,导致网络中的使用方式和流量模式完全难以预测。过去所建立的基础设施难以适应这些新变化,为了满足这些需求,网络必须能够快速、自动、经济地适... 详细信息

Web已经改变了一切。新的服务每天都在出现,并且有些服务一夜之间就能够获得巨大的用户量,导致网络中的使用方式和流量模式完全难以预测。过去所建立的基础设施难以适应这些新变化,为了满足这些需求,网络必须能够快速、自动、经济地适应新的变化。软件定义网络(SDN)和网络功能虚拟化(NFV)就是其中两个能灵活地使能上述需求的技术。本文描述了SDN在Ip网络领域中所起的作用(包括在实现NFV方面的关键作用),并介绍了关于网络如何引入SDN和NFV的场景和多个使用案例,用于说明SDN和NFV如何使得网络更加敏捷、可编程、优化地支持业务和用户的特殊需求。

关键词： SDN NFV Ip网络网络演进

TiO_2担载镍催化剂上硝基苯液相加氢(英文)

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催化学报 2012年第8期33卷 1299-1305页

作者： K.Joseph Antony RAJ m.G.pRAKASH R.mAHALAKSHmY T.ELANGOVAN B.viswanathan National Centre for Catalysis Research Indian Institute of Technology-Madras Chennai 600036 India pG & Research Department of Chemistry Thiagarajar College Madurai 625009 India

The catalytic hydrogenation of nitrobenzene to aniline employing nickel impregnated on rutile,anatase,and high surface area titania supports has been investigated.The nickel is present in elemental state as fcc phase on the catalyst as evidenced by X-ray diffraction results.The Ni crystallite size was found to be greater for Ni/anatase.The temperature-programmed reduction results suggest a greater metal-support interaction for Ni/rutile.The observed order of catalytic activity for the hydrogenation of nitrobenzene is Ni/rutile > Ni/anatase > Ni/TiO2.A conversion of 99% was observed for Ni/rutile at 140 oC and hydrogen pressure of 1.96 mpa.Interestingly,aniline is the only product formed which demonstrates the catalytic hydrogenation of nitrobenzene proceeds with atom economy.Both Ni/rutile and Ni/anatase exhibited a better stability than Ni/TiO2.The hydrogenation proceeds with the preferential adsorption of hydrogen on nickel present in the catalyst surface,possibly assisted by TiOx species.

关键词： hydrogenation nitrobenzene nickel titania aniline

Galvanic corrosion of AZ31B joined to dual-phase steel with and without Zn layer by ultrasonic and friction stir welding

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Journal of magnesium and Alloys 2023年第2期11卷 462-479页

作者： Jiheon Jun Vineet V.Joshi Alasdair Crawford Vilayanur viswanathan Donovan N.Leonard Jian Chen piyush Updadhyay Yong Chae Lim Zhili Feng Oak Ridge National Laboratory Oak RidgeTNUSA pacific Northwest National Laboratory RichlandWashingtonUSA

Galvanic corrosion of AZ31B joined with bare or Zn-coated Dp590 steel by ultrasonic spot welding or linear friction stir welding was quantitatively studied by pre-defining anode and cathode in the lap joint samples. Corrosion volume and depth from mg anode surfaces exposed to 0.1 m sodium chloride solution was analyzed as functions of cathode surface type and welding method. Characterization of as-welded joints was performed to identify any microstructural feature of the bonding zone that could impact galvanic corrosion behavior.COmSOL modeling with modified user subroutine was conducted to simulate the progression of mg corrosion in the same joint and electrode configurations used for the corrosion experiments. The experimental results indicated that Zn-coated cathode surface can reduce mg galvanic corrosion significantly as galvanic polarization and cathodic current on Zn-coated surface remained relatively low for mg in the weld joints.COmSOL modeling described the growth of mg galvanic corrosion in a reasonable manner but showed limitation by underestimating the corrosion volume as it did not capture self-corrosion.

关键词： mg alloy Zn coating Ultrasonic spot welding Friction stir welding Galvanic corrosion

Efficacy and safety of tadalafil taken as needed for the treatment of erectile dysfunction in Asian men： results of an integrated analysis

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Asian Journal of Andrology 2009年第4期11卷 423-433页

作者： Ying-Lu Guo Vijay p viswanathan Han-Sun Chiang Hyung Ki Choi Andrew Wai Chun Yip Wei Shen Vladimir Kopernicky Andrology Center Peking University First Hospital Peking University Beo＇ing 100009 China m. V. Hospital for Diabetes and Diabetes Research Centre Chennai 600013 India School of medicine Fu Jen Catholic University Taipei 24205 Taiwan China Department of Urology Yongdong Severance Hospital Seoul 135720 Korea Department of Surgery Kwong Wah Hospital Hong Kong China Lilly USA LLC Indianapolis IN 46285 USA

We evaluated the efficacy and safety of as-needed tadalafil in a diverse clinical population （with varying patient demographics, disease severity, and comorbid medical conditions） of Asian men with erectile dysfunction （ED）. An integrated analysis of five double-blind, placebo-controlled trials （N = 1 046） was performed. patients were randomly assigned to receive 10 mg tadalafil （N = 185）, 20 mg tadalafil （N = 510）, or placebo （N = 351）. Efficacy assessments included the International Index of Erectile Function （IIEF）, Sexual Encounter profile （SEp） diary and Global Assessment Question （GAQ）. patients receiving 10 mg or 20 mg tadalafil showed significant improvement from baseline-to-end point on the Erectile Function domain of the International Index of Erectile Function （IIEF-EF） domain score in all clinical sub-populations analyzed, compared with patients receiving placebo （p 〈 0.001）. The 10-mg and 20-mg tadalafil groups showed a mean success rate of 64.1% and 70.5% for sexual intercourse attempts （SEp3, successful intercourse）, respectively, compared with 33.4% in the placebo group （p 〈 0.001）, and 85.5% and 85.4% reported improved erections at end point GAQ, respectively, versus 43.5% in the placebo group （p 〈 0.001）. Tadalafil was well tolerated across all groups studied. Headache and back pain were the most frequently reported adverse events. Overall, tadalafil was effective and well tolerated across a diverse clinical spectrum of Asian men with ED.

关键词： Asia comorbidity erectile dysfunction phosphodiesterase inhibitors tadalafil