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Covalently Bonded Ni Sites in Black Phosphorene with Electron Redistribution for Efficient Metal‑Lightweighted Water Electrolysis

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Nano-Micro Letters 2024年第6期16卷 233-245页

作者： Wenfang Zhai Ya Chen Yaoda Liu Yuanyuan Ma Paranthaman vijayakumar Yuanbin Qin Yongquan Qu Zhengfei Dai State key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China SSN Research Centre SSN College of EngineeringChennaiTamil Nadu 603110India

The metal-lightweighted electrocatalysts for water splitting are highly desired for sustainable and economic hydrogen energy deployments,but *** this work,a low-content Ni-functionalized approach triggers the high capability of black phosphorene(BP)with hydrogen and oxygen evolution reaction(HER/OER)*** a facile in situ electro-exfoliation route,the ionized Ni sites are covalently functionalized in BP nanosheets with electron redistribution and controllable metal *** is found that the as-fabricated Ni-BP electrocatalysts can drive the water splitting with much enhanced HER and OER *** 1.0 M kOH electrolyte,the optimized 1.5 wt%Nifunctionalized BP nanosheets have readily achieved low overpotentials of 136 mV for HER and 230 mV for OER at 10 mA cm^(−2).Moreover,the covalently bonding between Ni and P has also strengthened the catalytic stability of the Ni-functionalized BP electrocatalyst,stably delivering the overall water splitting for 50 h at 20 mA cm^(−2).Theoretical calculations have revealed that Ni–P covalent binding can regulate the electronic structure and optimize the reaction energy barrier to improve the catalytic activity *** work confirms that Ni-functionalized BP is a suitable candidate for electrocatalytic overall water splitting,and provides effective strategies for constructing metal-lightweighted economic electrocatalysts.

关键词： Black phosphorus Water electrolysis Electrocatalyst Electron redistribution Covalent functionalization

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Nickel oxide nanoparticles catalyzed synthesis of poly-substituted quinolines via Friedlander hetero-annulation reaction

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Chinese Chemical Letters 2014年第12期25卷 1595-1600页

作者： B.Palakshi Reddy P.Iniyavan S.Sarveswari V.vijayakumar Centre for Organic and Medicinal Chemistry VIT University

Reusable acidic nickel oxide nanoparticles have been synthesized,characterized and applied as a catalyst to convert 2-aminoaryl ketones and β-ketoesters/ketones into the corresponding quinolines in good yields with h... 详细信息

关键词： o-Aminoaryl ketones NiO NPs Friedlander annulation Quinolines

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Antimicrobial and antiproliferative prospective of kosinostatin-a secondary metabolite isolated from Streptomyces sp.

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Journal of Pharmaceutical Analysis 2015年第6期5卷 378-382页

作者： Vinayagam Rambabu Subramaniyan Suba Suburamaniyan vijayakumar P.G. and Research Department of Botany and Microbiology A.V.V.M. Sri Pushpam College (Autonomous) k.k Biotec Lab Service

Cancer is a communal health hazard worldwide. The present investigation attempts to evaluate anti- microbial and anticancer potential of kosinostatin on mammary carcinoma cell line （MCF-7）. The anticancer and antiproliferative activities of kosinostatin were analyzed on MCF cell line by MTT assay and cytotoxicity assays like lactate dehydrogenase （LDH） and glutathione （GSH）. The secondary metabolite kosinostatin exhibited its apoptotic nature by expressing p53 protein. Collectively, the results acquired from this study promise that kosinostatin shows the potent anticancer activity.

关键词： kosinostatin Secondary metabolite Streptomyces sp. Cytotoxic activity MCF-7

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Free radical scavenging potential of Lagenaria siceraria(Molina) Standl fruits extract

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Asian Pacific Journal of Tropical Medicine 2013年第1期6卷 20-26页

作者： vijayakumar Mayakrishnan Selvi Veluswamy krishnakumari Shanmuga Sundaram Priya kannappan Noorlidah Abdullah Institute of Biological Science Faculty of ScienceUniversity of MalayaKuala Lumpur-50603Malaysia Department of Biochemistry Kongunadu Arts and ScienceCoimbatore-641029TamilnaduIndia Department of Biochemistry.PSG college of Arts and Science Coimbatore-641029TamilnaduIndia

Objective:To elucidate free radical scavenging activity of ethanolic extract Lagenaria siceraria （***）（Molina） ***:The free radical scavenging activity of the L siceraria （Molina） fruit extract was assayed by usingα,α-diphenyl-β-picrylhydrazyl（DPPH）. 2,20-azinobis 3-ethyl henzothiazoline-6-sulfonate（ABTS）,FRAP,reducing power,chelating ability andβ-carotene bleaching ***:The IC50values of DPPH and ABTS radicalscavenging activity was found to be 1.95 mg/mL and 19 mg/mL,*** ferrous chelation assay,the percentage of inhibition was found to be 89.21%.The reducing power of ethanolic extract of L siceraria（Molina） fruit was 0.068 at 1 mg/mL and increased to 0.192 at 5 mg/mL Theβ-carotene linoleate bleaching assay was 46.7%at 5 mg/mL and antioxidant activity using FRAP at 0.305 for 1 mg/mL to 0.969 for 5 mg/mL Conclusions:The results indicate that L siceraria （Molina） fruit could be an important sources of natural radical scavengers.

关键词： Lagenaria siceraria Antioxidant DPPH ABTS Free radical

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Improved Specificity for Breast Cancer Screening Using an Oncogenic(miRNA-21)and a Gene Suppressor(miRNA-195)miRNA in the Serum for a Point of Care(POC)Screening Solution

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Biomedical and Environmental Sciences 2023年第6期36卷 549-552页

作者： krishnamoorthy kokilavani Ancy Terryna Chanayiltharayil John Bindu Salim Madhulika vijayakumar Sankar Ganesh Jeyaraj PSG Institute of Advanced Studies Avinashi RoadPeelameduCoimbatore641004 PSG Institute of Medical Science and Research Avinashi Road PeelameduCoimbatore641004 PSG Center for Molecular Medicine and Therapeutics PSG Institute of Medical Sciences and ResearchCoimbatoreTamil Nadu641004India PSG Centre for Genetics and Molecular Biology Off Avinashi RoadPeelameduCoimbatoreTamil Nadu641004India

The overall incidence and burden caused by breast cancer is increasing,affecting the global socio-economic development and life expectancy[1].According to“WHO Global Breast Cancer Initiative(GBCI)reports”,if the mortality rate due to breast cancer can be reduced by 2.4%annually,we may prevent 2.5 million breast cancer deaths between2020-2040.

关键词： Breast Cancer Serum

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Zero-DCE++Inspired Object Detection in Less Illuminated Environment Using Improved YOLOv5

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Computers, Materials & Continua 2023年第12期77卷 2751-2769页

作者： Ananthakrishnan Balasundaram Anshuman Mohanty Ayesha Shaik krishnadoss Pradeep kedalu Poornachary vijayakumar Muthu Subash kavitha Centre for Cyber Physical Systems Vellore Institute of Technology(VIT)ChennaiTamil Nadu600127India School of Computer Science and Engineering Vellore Institute of Technology(VIT)ChennaiTamil Nadu600127India School of Information and Data Sciences Nagasaki UniversityNagasaki8528521Japan

Automated object detection has received the most attention over the *** cases ranging from autonomous driving applications to military surveillance systems,require robust detection of objects in different illumination ***-of-the-art object detectors tend to fare well in object detection during daytime ***,their performance is severely hampered in night light conditions due to poor *** address this challenge,the manuscript proposes an improved YOLOv5-based object detection framework for effective detection in unevenly illuminated nighttime ***,the preprocessing strategies involve using the Zero-DCE++approach to enhance lowlight *** is followed by optimizing the existing YOLOv5 architecture by integrating the Convolutional Block Attention Module(CBAM)in the backbone network to boost model learning capability and Depthwise Convolutional module(DWConv)in the neck network for efficient compression of network *** Night Object Detection(NOD)and Exclusively Dark(ExDARk)dataset has been used for this *** proposed framework detects classes like humans,bicycles,and *** demonstrate that the proposed architecture achieved a higher Mean Average Precision(mAP)along with a reduction in model size and total parameters,*** proposed model is lighter by 11.24%in terms of model size and 12.38%in terms of parameters when compared to baseline YOLOv5.

关键词： Object detection deep learning nighttime road scenes YOLOv5 DWConv Zero-DCE++ CBAM

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Design of Energy Efficient WSN Using a Noble SMOWA Algorithm

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Computers, Materials & Continua 2022年第8期72卷 3585-3600页

作者： Avishek Banerjee Deepak Garg Victor Das Laxminarayan Sahoo Ira Nath vijayakumar Varadarajan ketan kotecha Department of Computer Science and Engineering Bennett UniversityGreater Noida201310India Department of Information Technology Asansol Engineering CollegeAsansol713305India Department of Computer and Information Science Raiganj UniversityRaiganj733134India Department of Computer Science and Engineering JIS College of EngineeringKalyani741235India School of Computer Science and Engineering University of New South WalesSydneyAustralia Symbiosis Centre for Applied Artificial Intelligence Symbiosis International(Deemed University)PuneIndia

In this paper,the establishment of efficientWireless Sensor Network(WSN)networks has been projected to minimize the consumption of energy using a new Self-adaptive Multi-Objective Weighted Approach(SMOWA)algorithm for solving a multi-objective *** Different WSN nodes deployment policies have been proposed and applied in this paper to design an efficientWireless Sensor Network to minimize energy *** that,the cluster head for each cluster has been selected with the help of the duty *** configuring the WSN networks,the SMOWA algorithms have been developed to obtain the minimum energy consumption for the *** minimization,as well as the amount of day-saving,has been calculated for the differentWSNswhich has been configured through different deployment *** major finding of the research paper is to improve the durability of Wireless Sensor Network(i)applying different deployment strategies:(Random,S pattern and nautilus shell pattern),and(ii)using a new Meta-heuristic algorithm(SMOWA Algorithm).In this research,the lifetime of WSN has been increased to a significant *** choose the best result set from all the obtained results set some constraints such as“equivalent distribution”,“number of repetitions”,“maximum amount energy storage by a node”has been set to an allowable range.

关键词： Wireless Sensor Network(WSN) Self-adaptive Multi-Objective Weighted Approach(SMOWA) deployment strategies Meta-heuristicMethods energy minimization duty cycle

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Evaluation of chemopreventive effect of Fumaria indica against N-nitrosodiethylamine and CCl_4-induced hepatocellular carcinoma in Wistar rats

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Asian Pacific Journal of Tropical Medicine 2012年第8期5卷 623-629页

作者： Talib Hussain Hefazat H Siddiqui Sheeba Fareed M vijayakumar Chandana V Rao Department of Pharmacology and Toxicology Faculty of PharmacyIntegral Universitykursi roadLucknow-226026Uttar PradeshIndia Pharmacognosy and Ethnopharmacology Division National Botanical Research Institute(CSIR)Rana Pratap MargP.B.No.436Lucknow 226 001Uttar PradeshIndia

Objective:To investigation the chemopreventive potential of Fumaria indica（***） extract（FIE） on N-nitrosodiethylamine and CCl4-induced hepatocarcinogenesis in Wislar ***:The experimental animals were divided into six groups（n=6）.Hepatocellular carcinoma was induced by single intraperitoneal injection of N-nitrosodiethylamine（NDEA） in normal saline at a dose of 200 mg/kg body weight followed by weekly subcutaneous injections of CCl4（3 mL/kg/week） for 6 weeks,as the promoter of carcinogenic *** administration of the carcinogen,200 and 400 mg/kg of FIE were administered orally once a day throughout the *** the end of 20 weeks,the body weight,liver weight and relative liver weight were *** percentage of nodule incidence and liver cancer markers such as aspartate transaminase（AST）,alanine transaminase（ALT）,alkaline phosphatase（ALP）,γ-glutamyl transferase（γ-GT）,total bilirubin level（TBL）,α-feto protein（AFP） and carcinoembryonic antigen were estimated along with histopathological investigation in experimental groups of rats. Results:Obtained results demonstrated that the cotreatment with FIE significantly prevented the decrease of the body weight and also increased in relative liver weight caused by NDEA. The treatment with FIE significantly reduced the nodule incidence and nodule multiplicity in the rats after NDEA *** levels of liver cancer markers such as AST,ALT,ALP,γ-glutamyl transferase,TBL,AFP and carcinoembryonic antigen were substantially increased by NDEA ***,FIE treatment significantly reduced the liver injury and restored the entire liver cancer *** observations of liver tissues too correlated with the biochemical ***:These finding powerfully supports that *** exert chemopreventive effect by suppressing the tumor burden and restoring the activities of hepatic cancer marker enzymes on NDEA and CCl4-induced hepatocarcinogenesis in Wis

关键词： Fumaria indica Hepatocellular carcinoma N-nitrosodiethylamine Alkaline phosphatase α-feto protein

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Enhanced Perturb and Observe Control Algorithm for a Standalone Domestic Renewable Energy System

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Intelligent Automation & Soft Computing 2023年第8期37卷 2291-2306页

作者： N.kanagaraj Obaid Martha Aldosary M.Ramasamy M.vijayakumar Electrical Engineering Department College of Engineering in Wadi Al-dawasirPrince Sattam Bin Abdulaziz UniversityWadi Al-dawasir11991Saudi Arabia Department of Electrical and Electronics Engineering K.S.R.College of EngineeringTiruchengode637215India

The generation of electricity,considering environmental and eco-nomic factors is one of the most important challenges of recent *** this article,a thermoelectric generator(TEG)is proposed to use the thermal energy of an electric water heater(EWH)to generate electricity *** improve the energy conversion efficiency of the TEG,a fuzzy logic con-troller(FLC)-based perturb&observe(P&O)type maximum power point tracking(MPPT)control algorithm is used in this *** EWH is one of the major electricity consuming household appliances which causes a higher electricity price for ***,a significant amount of thermal energy generated by EWH is wasted every day,especially during the winter *** recent years,TEGs have been widely developed to convert surplus or unused thermal energy into usable *** this context,the proposed model is designed to use the thermal energy stored in the EWH to generate *** addition,the generated electricity can be easily stored in a battery storage system to supply electricity to various household appliances with *** proposed MPPT control algorithm helps the system to quickly reach the optimal point corresponding to the maximum power output and maintains the system operating point at the maximum power output *** validate the usefulness of the proposed scheme,a study model was developed in the MATLAB Simulink environment and its performance was investigated by simulation under steady state and transient *** results of the study confirmed that the system is capable of generating adequate power from the available thermal energy of *** was also found that the output power and efficiency of the system can be improved by maintaining a higher temperature difference at the input terminals of the ***,the real-time temperature data of Abha city in Saudi Arabia is considered to analyze the feasibility of the proposed system for practical implementation.

关键词： Perturb and observe control algorithm fuzzy logic controller energy conversion efficiency maximum power point tracking thermoelectric generator

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Facile and environmentally sustainable synthesis of bone waste derived biochar-based bimetallic-LDH nanocomposite for selected dyes removal from aqueous medium

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WASTE DISPOSAL & SUSTAINABLE ENERGY 2024年第3期6卷 355-369页

作者： Viswanathan, Shanthi Prabha kuriakose, Giya Merline Njazhakunnathu, Gopika vijayakumar Neelamury, Sreekanth Prakasan Ambatt, Thomas Paili Mahatma Gandhi Univ Adv Ctr Environm Studies & Sustainable Dev ACESSD Kottayam 686560 Kerala India

The disposal of bone waste can be effectively addressed utilizing a novel approach involving the synthesis of a bovine bone-derived biochar-based Mg/Al-layered double hydroxide (LDH) nanocomposite (B-Mg/Al-NC). This nanocomposite exhibits exceptional capabilities for removing specific dyes, such as Methylene Blue (MB) and Congo Red (CR), from aqueous media. Extensive characterization using techniques confirmed the successful formation of the B-Mg/Al-NC, which possesses a high surface area, high porosity, and abundant functional groups. The Langmuir monolayer biosorption capacity was 395.56 mg g-1 and 328.25 mg g-1 at 50 degrees C for MB and CR, respectively, with rapid dye removal achieved within 25 min under alkaline pH conditions. The experimental data fit well with the pseudo-second-order kinetics model for both dyes. The remarkable dye adsorption capacity of the B-Mg/Al-NC can be attributed to the combined basic properties of the bone biochar and Mg/Al-LDH. Proposed mechanisms for enhanced dye removal include hydrogen bonding interactions, anion exchange, surface complexation, electrostatic interactions, and pore filling. Furthermore, the nanocomposite exhibited excellent reusability. In addition to its dye removal capabilities, the B-Mg/Al-NC was found to have a positive effect on seed germination and growth and salient soil health parameters, as demonstrated by a rapid seed germination test using the spent composite. Overall, the facile synthesis of the B-Mg/Al-NC via co-precipitation and ultrasonication is a highly recommended and sustainable approach for producing an eco-friendly bio-sorbent with exceptional dye removal efficiency from wastewater while also addressing the issue of bone waste disposal.

关键词： Bone waste Biochar Double-layer hydroxide Dyes Adsorption Eco-friendly Environment sustainability

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