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Erosion corrosion control of 6061 aluminum alloy in multi-phase jet impingement conditions with eco-friendly green inhibitor

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Chinese Journal of Chemical Engineering 2020年第2期28卷 340-347页

作者： m.lavanya V.Ramachandra murthy Padmalatha Rao Department of Biotechnology Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnatakaIndia Department of Chemistry Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnatakaIndia

Erosion corrosion performance of 6061 aluminum alloy in simulated sea water slurry was investigated under multi-phase jet impingement conditions. The main objective of the work is to study erosion–corrosion of a material with engineering application and mitigate it using eco-friendly green inhibitor. Experiments were performed with the sand concentration of 0.3% and 0.3 μm size. The effect of temperature and flow rate on the performance of inhibitor was explored. Electrochemical methods were adopted for erosion-corrosion measurements. Experiments revealed that starch could mitigate erosion-corrosion with a maximum reduction efficiency of 58% at temperature of 303 K and flow rate of 4 L·min–1. Inhibition efficiency decreased with increase in flowrate and temperature. EIS spectrum demonstrated that the corrosion process in the presence on inhibitor was both charge transfer and mass transfer controlled. A key role of hydrodynamics in the performance of corrosion inhibitor was confirmed by the present study.

关键词： Erosion-corrosion Green-inhibitor Electrochemical studies Aluminum alloy Simulated sea water

Tight Focusing Properties of Azimuthally Polarized Pair of Vortex Beams through a Dielectric Interface

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Chinese Physics Letters 2017年第7期34卷 109-113页

作者： C. A. P. Janet m. lavanya K. B. Rajesh m. Udhayakumar Z. Jaroszewicz D. Velauthapillai Department of Physics St.Xavier's Catholic College of Engineering Nagercoil Tamilnadu India Department of Physics PSGR Krishnammal College for Women Coimbatore Tamilnadu India Department of Physics Chikkanna Government Arts College Tiruppur Tamilnadu India Institute of Applied Optics Department of Physical Optics Warsaw Poland and National Institute of Telecommunications Warsaw Poland Faculty of Engineering and Business Administration Bergen University College Bergen Norway

Tight focusing properties of an azimuthally polarized Gaussian beam with a pair of vortices through a dielectric interface is theoretically investigated by vector diffraction theory. For the incident beam with a pair of vortices of opposite topological charges, the vortices move toward each other, annihilate and revive in the vicinity of focal plane, which results in the generation of many novel focal patterns. The usable focal structures generated through the tight focusing of the double-vortex beams may find applications in micro-particle trapping, manipulation, and material processing, etc.

关键词： Tight Focusing Properties of Azimuthally Polarized Pair of Vortex Beams through a Dielectric Interface

Erosion corrosion control of 6061 aluminum alloy in multi-phase jet impingement conditions with eco-friendly green inhibitor

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Graph-Based Replication and Two Factor Authentication in Cloud Computing

中国化学工程学报（英文版） 2020年第2期

作者： m.lavanya V.Ramachandra murthy Padmalatha Rao

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Computer Systems Science & Engineering 2023年第6期45卷 2869-2883页

作者： S.lavanya N.m.Saravanakumar Sri Krishna College of Engineering and Technology Coimbatore641008TamilnaduIndia m.Kumarasamy College of Engineering Karur639113Tamil NaduIndia

many cutting-edge methods are now possible in real-time commercial settings and are growing in popularity on cloud *** incorporating new,cutting-edge technologies to a larger extent without using more infrastructures,the information technology platform is anticipating a completely new level of *** following concepts are proposed in this research paper:1)A reliable authentication method Data replication that is optimised;graph-based data encryp-tion and packing colouring in Redundant Array of Independent Disks(RAID)*** the data centre,data is encrypted using crypto keys called Key *** keys are produced using the packing colouring method in the web graph’s jump *** order to achieve space efficiency,the replication is carried out on optimised many servers employing packing *** would be thought that more connections would provide better *** study provides an innovative architecture with robust security,enhanced authentication,and low cost.

关键词： Graph-based encryption replication encryption packing coloring jump graph web graph stream cipher key stream

mining Genomic Patterns in mycobacterium tuberculosis H37Rv Using a Web Server Tuber-Gene

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Genomics, Proteomics & Bioinformatics 2011年第4期9卷 171-178页

作者： lavanya Rishishwar Bhasker Pant Kumud Pant Kamal R. Pardasani School of Biology Georgia Institute of Technology Atlanta Georgia 30332 USA Department of Information Technology Graphic Era University Dehradun Uttrakhand 248002 India Department of Bioinformatics Maulana Azad National Institute of Technology Bhopal Madhya Pradesh 462051 India Department of mathematics Maulana Azad National Institute of Technology Bhopal Madhya Pradesh 462051 India

mycobacterium tuberculosis （mTB）, causative agent of tuberculosis, is one of the most dreaded diseases of the century. It has long been studied by researchers throughout the world using various wet-lab and dry-lab techniques In this study, we focus on mining useful patterns at genomic level that can be applied for in silico functional characterization of genes from the mTB complex. The model developed on the basis of the patterns found in this study can correctly identify 99.77% of the input genes from the genome of mTB strain H37Rv. The model was tested against four other mTB strains and the homologue m. bovis to further evaluate its generalization capability. The mean prediction accuracy was 85.76%. It was also observed that the GC content remained fairly constant throughout the genome, implicating the absence of any pathogenicity island transferred from other organisms. This study reveals that dinucleotide composition is an efficient functional class discriminator for mTB complex. To facilitate the application of this model, a web server Tuber-Gene has been developed, which can be freely accessed at http：//***/tb2/.

关键词： dinucleotide composition mycobacterium tuberculosis support vector machine data mining

Discovery of natural berberine-derived nitroimidazoles as potentially multi-targeting agents against drug-resistant Escherichia coli

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Science China Chemistry 2018年第5期61卷 557-568页

作者： Guo-Biao Zhang Swetha Kameswari maddili Vijai Kumar Reddy Tangadanchu lavanya Gopala Wei-Wei Gao Gui-Xin Cai Cheng-He Zhou Institute of Bioorganic & medicinal Chemistry Key Laboratory of Applied Chemistry of Chongqing Municipality School of Chemistry and Chemical Engineering Southwest University

A series of natural berberine-derived nitroimidazoles as novel antibacterial agents were designed, synthesized and characterized by nuclear magnetic resonance(NmR), infrared spectra(IR), and high resolution mass spectra(HRmS) spectra. The antimicrobial evaluation showed that some target molecules exhibited moderate to good inhibitory activities against the tested bacteria and fungi including clinical drug-resistant strains isolated from infected patients. Especially, 2-fluorobenzyl derivative8 f not only gave strong activity against drug-resistant E. coli with the minimal inhibitory concentration(mIC) value of0.003 m m, 33-fold more active than norfloxacin, but also exhibited low toxicity toward RAW 264.7 cells and less propensity to trigger resistance. The aqueous solubility and Clog P values of target compounds were investigated to elucidate the structureactivity relationships. molecular docking and quantum chemical studies for compound 8 f rationally explained its antibacterial effect. The further exploration of antibacterial mechanism revealed that the highly active compound 8 f could effectively permeabilize E. coli cell membrane and intercalate into DNA isolated from resistant E. coli to form 8 f-DNA complex that might block DNA replication to exert the powerful bioactivities. Compound 8 f could also selectively address resistant E. coli from a mixture of various strains.

关键词： berberine nitroimidazole Escherichia coli DNA membrane permeabilization

Novel potentially antibacterial naphthalimide-derived metronidazoles:Design,synthesis,biological evaluation and supramolecular interactions with DNA,human serum albumin and topoisomeraseⅡ

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Chinese Chemical Letters 2017年第7期28卷 1369-1374页

作者： Jie Kang Vijai Kumar Reddy Tangadanchu lavanya Gopala Wei-Wei Gao Yu Cheng Han-Bo Liu Rong-Xia Geng Shuo Li Cheng-He Zhou Institute of Bioorganic&medicinal Chemistry Key Laboratory of Applied Chemistry of Chongqing MunicipalitySchool of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China School of Chemical Engineering Chongqing University of TechnologyChongqing 400054China Postdoctoral researcher from CSIR-Indian Institute of Chemical Technology Hyderabad 500007India Postdoctoral researcher Sri Venkateswara University Tirupati 517502India

A series of novel naphthalimide-derived metronidazoles as new type of antimicrobial agents were for the first time designed, synthesized and characterized by NmR, IR and HRmS spectra. Experimental results revealed that most of them displayed moderate to good antibacterial activity towards Gram-positive and negative bacteria. Especially, compound 7b was able to not only exhibit effective inhibition towards the growth of P. vulgaris（mIC = 0.002 mmol/m L） and S. dysenteriae（mIC = 0.01 mmol/m L）, but also have rapidly killing effect and prevent the development of bacterial resistance. Further research revealed that the highly active molecule 7b could not only intercalate into calf thymus DNA to form a steady supramolecular complex and thus might block DNA replication to exert the powerful bioactivities, but also be effectively transported by human serum albumin（HSA） via the formation of the 1：1supramolecular complex, in which hydrogen bonds and hydrophobic effect played important roles in the association of compound 7b with HSA. molecular docking indicated that the supramolecular interactions between 7b and topoisomerase II were driven by hydrogen bonds.

关键词： metronidazole Naphthalimide Antibacterial Supramolecular DNA

不同距离观看3D影像后视光学参数和视力疲劳症状分析（英文）

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国际眼科杂志 2018年第5期18卷 769-774页

作者： Oleeviya Joseph lavanya Kalikivayi Sajeev Cherian Jacob Venkataramana Kalikivayi Ahvliv视光学院视光科印度伯拉卡德678557 Ahvliv基础眼科医院青光眼科印度伯拉卡德678557

目的:不同距离观看3D影像后调节幅度、集合近点(NPC)及近隐斜视和视力疲劳的症状分析。方法:前瞻性研究,包括30例青年。每人每天三次分别在特定距离和不同距离观看3D影像,并连续三天进行观察,每一距离使用相同视频,相同的时间和不同的... 详细信息

目的:不同距离观看3D影像后调节幅度、集合近点(NPC)及近隐斜视和视力疲劳的症状分析。方法:前瞻性研究,包括30例青年。每人每天三次分别在特定距离和不同距离观看3D影像,并连续三天进行观察,每一距离使用相同视频,相同的时间和不同的屏幕大小。使用K-multimedia player 3D播放器。观看3D影响后立即记录立体视觉、调节幅度、调节近点及近隐斜视和视力疲劳症状等相关变量。分别使用TNO测量视功能,RAF尺测量调节幅度和集合近点,棱镜杆测量近隐斜视,封闭式问卷调查视力疲劳症状的发生情况。用描述性统计和配对t检验进行数据分析,定性数据采用卡方检测。结果:在40 cm,3 m和6 m处调节幅度分别减少了0.66 D,1.12 D和1.44 D,集合近点显著降低了0.63 cm,0.93 cm和1.23 cm,近隐斜视分别增加了0.87,2.74和2.2棱镜度。结果发现,大多数受试者在每一距离处都出现眼周疼痛,头痛和刺激等反应。在家庭环境中,头痛、盗汗、疲劳、刺激和恶心等症状会显著增加,此外,通过使用笔记本电脑观看3D可能会引起头痛和盗汗等相关不适症状。结论:观看3D前后、在三种不同距离处,调节幅度、集合近点及近隐斜视和视力疲劳的症状显著不同。在不同距离观看3D影像后,视力疲劳为主要症状。

关键词：调节幅度集合近点近隐斜视视疲劳 3D视频与立体视觉

Synthesis of Potential mRSA DNA-targeting Naphthalimide Aminothiazoles as Novel Antimicrobial Agent

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Synthesis of Potential MRSA DNA-targeting Naphthalimide Amin...