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Synthesis of Metallic Nanoparticles Based on Green Chemistry and Their Medical Biochemical Applications:Synthesis of Metallic Nanoparticles

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Journal of Renewable Materials 2023年第6期11卷 2575-2591页

作者： kakudji kisimba Anand krishnan Mbuso Faya kahumba Byanga kabange kasumbwe kaliyapillai vijayakumar Ram Prasad Department of Pharmaceutical Sciences University of Kwazulu-NatalPrivate Bag X54001DurbanSouth Africa Department of Chemical Pathology School of PathologyFaculty of Health SciencesUniversity of the Free StateBloemfonteinSouth Africa Faculty of Pharmaceutical Sciences University of LubumbashiLubumbashiDemocratic Republic of Congo Department of Biotechnology and Food Sciences Durban University of TechnologyDurbanSouth Africa Department of Chemistry M.Kumarasamy College of EngineeringKarurTamilnaduIndia Department of Botany Mahatma Gandhi Central UniversityMotihariBiharIndia

Nanoparticles have distinct properties that make them potentially valuable in a variety of *** a result,emerging approaches for the manufacture of nanoparticles are gaining a lot of scientific *** biological pathway of nanoparticle synthesis has been suggested as an effective,affordable,and environmentally safe *** of nanoparticles through physical and chemical processes uses unsafe materials,expensive equipment and adversely affects the *** a result,in order to support the increased utilization of nanoparticles across many sectors,nanotechnology research activities have shifted toward environmentally safe and cost-effective techniques that outperform chemical and/or biological *** use of organisms to produce metal nanoparticles is among the most frequently discussed *** appear to be the best candidates among these organisms for large-scale nanoparticle *** plants have been employed as reducing agents and NP stabilizers to minimize the toxicity of NPs in both the environment and the human ***,the presence of certain functional components in plant extracts may be extremely useful and effective for the human ***,for example,which may have antioxidant properties,might intercept free radicals before they interact with other biomolecules and cause considerable *** current article analyzes the most recent developments and improvements in the green synthesis of metal nanoparticles by different plants and the use of these nanoparticles for various biomedical applications and hopes to provide insights into this exciting research frontier.

关键词： Biosynthesis nanoparticles antimicrobial anticancer antioxidant medicinal plants

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Effect of Flow Field Geometry on Hydrodynamics of Flow in Redox Flow Battery

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Energy Engineering 2022年第1期119卷 201-217页

作者： M.Narendra kumar S.Manoj kumar G.C.vijayakumar k.kadirgama M.Samykano krishna Venkatesh H.B.Murlidhara Center for Incubation Innovation Research and Consultancy(CIIRC)Jyothy Institute of TechnologyBangalore560082KarnatakaIndia Department of Mechanical Engineering Jyothy Institute of TechnologyBangalore560082KarnatakaIndia Faculty of Mechanical and Automotive Engineering Technology University Malaysia PahangPahang26600Malaysia Centre for Automotive Engineering Universiti Malaysia PahangPahang26600Malaysia College of Engineering Universiti Malaysia PahangPahang26600Malaysia

This study computationally investigates the hydrodynamics of different serpentine flow field designs for redox flow batteries,which considers the Poiseuille flow in the flow channel and the Darcy flow porous *** Fluid Dynamics(CFD)results of the in-house developed code based on Finite Volume Method(FVM)for conventional serpentine flow field(CSFF)agreed well with those obtained via *** deviation for pressure drop(ΔP)was less than 5.1%for all the flow rates,thus proving the present CFD analysis’s validity on the modified variation of serpentine flow *** serpentine flow field-2(MSFF2)design provided least pressure drop across the channel and maximum velocity penetration across the porous substrate when compared to the other *** increases its wetting ability,which is very important in terms of mass transfer over potential for electrochemical reaction happening in the porous substrate to achieve effective electrochemical cell performance.

关键词： Pressure drop velocity distribution serpentine flow field porous substrate redox flow battery

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Beneficiation of a low grade limestone sample

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Mining Science and Technology 2011年第5期21卷 631-636页

作者： Rao Danda Srinivas vijayakumar Tadiparthi Venkata Subba Rao Sripada Bhaskar Raju Guntamadugu Prabhakar Swarna National Metallurgical Laboratory Madras Centre CSIR Madras Complex Chennai 600 113 India

Pilot scale column flotation studies were conducted on a low grade siliceous limestone ore. Silica content was reduced to less than 13g in the concentrate so that it became satisfactory for use in the paper or rubber industries. The limestone sample was crystalline and constituted primarily of calcite that contained quartz, feldspar, pyroxene, and biotite as gangue minerals. Quartz is the major silicate gangue whereas feldspar, pyroxene, and biotite exist in minor to trace quantities. Traces of pyrite were also observed within the sample. A reverse flotation process was adopted where the silicate gangue minerals were floated using two different commercial cationic collectors： Chem-750 F or Floatamine-D. The studies clearly suggest it is possible to produce a limestone concentrate assaying around 96-97% CaCO3 containing less than 1 % Si02. The effect of feed flow rate, percent solids, froth depth, and wash water on the grade and recovery of the CaC03 concentrate is discussed.

关键词： Low grade limestoneReverse flotationColumn flotationCationic collector

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Some Physical Aspects of Summer Monsoon Clouds-Comparison of Cloud Model Results with Observations

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Advances in Atmospheric Sciences 1991年第1期8卷 111-124页

作者： A. Mary Selvam R. vijayakumar A. S. R. Murty Indian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 India

The physical characteristics of the summer monsoon clouds were investigated. The results of a simple cloud model were compared with the aircraft cloud physical observations collected during the summer monsoon seasons of 1973, 1974, 1976 and 1981 in the Deccan Plateau *** model predicted profiles of cloud liquid water content (LWC) are in agreement with the observed profiles. There is reasonable agreement between the model predicted cloud vertical thickness and observed *** observed cloud-drop spectra were found to be narrow and the concentration of drops with diameter > 20um is either low or absent on many occasions. In such clouds the rain-formation cannot take place under natural atmospheric conditions due to the absence of collision-coalescence process. A comparison of the model predicted and observed rainfall suggested that the precipitation efficiency in cumulus clouds of small vertical thickness could be as low as 20 per *** clouds forming in the Deccan Plateau region during the summer monsoon are, by and large, cumulus and strato-cumulus type. The vertical thickness of the cumulus clouds is in the range of 1.0-2.0 km. The LWC is found to be more in the region between 1.6-1.9 km A. S. L. , which corresponds to the level at almost 3 / 4 th of the total vertical thickness of the cloud and thereafter the LWC sharply decreased. Nearly 98 per cent of the tops of the low clouds in the region are below freezing level and the most frequent range of occurrence of these cloud-tops is in the range of 2.0-3.0 km A. S. L. The dominant physical mechanism of rain-formation in these summer monsoon clouds is the collision-coalescence process.

关键词： heat Some Physical Aspects of Summer Monsoon Clouds-Comparison of Cloud Model Results with Observations

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Enteric Red Mouth disease and its causative bacterium, Yersinia ruckeri, in Indian Major Carps from culture ponds in Andhra Pradesh, India

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Aquaculture and Fisheries 2021年第3期6卷 289-299页

作者： Shameem Ummey Sharmila khan P.P.N vijayakumar Adanki Ramya Department of Zoology Andhra UniversityVisakhapatnam530003India Advanced Analytical Laboratory Andhra UniversityVisakhapatnam530003India

During the present investigation,studies were carried out to investigate the outbreak of Redmouth disease in culture ponds situated at krishna,West Godavari and East Godavari districts of Andhra *** Red Mouth disease or Yersiniosis is a serious infectious bacterial disease,sometimes responsible for causing severe economic loss to fish farming *** disease is clinically characterized by symptoms like bleeding at the base of fins,inside and around mouth,bilateral exophthalmia with or without haemorrhage,and per-ocular and peri-oral *** the present study,live or moribund fish showing lesions similar to enteric redmouth disease were collected and the causative agent was isolated by culture *** identification was carried out by conventional biochemical methods and molecular polymerase chain *** extracted from isolated pathogen was subjected to PCR amplification with a pair of *** specific *** PCR product was run on 1.5%agarose gel electrophoresis and positive bands with a molecular size of approximately 500bp were *** is similar to that given for PCR products with primers specific for ***.

关键词： Yersinia ruckeri PCR Enteric Red Mouth Disease Indian Major Carps Andhra Pradesh

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Geochemical assessment of a siliceous limestone sample for cement making

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Chinese Journal Of Geochemistry 2011年第1期30卷 33-39页

作者： Rao D.S. vijayakumar T.V. Prabhakar S. Bhaskar Raju G. National Metallurgical Laboratory-Madras Centre CSIR Madras Complex Taramani Chennai-600 113 India

A low grade siliceous limestone sample from the Jayantipuram mine of Andhra Pradesh, India, has been investigated for its suitability for cement making. Petrological as well as X-ray diffraction pattern studies indicated that the limestone sample was crystalline and dominantly composed of calcite and quartz. They are simple in mineralogy, and yet they have variable silica and lime contents. Geochemical analysis results of twenty five hand picked samples indicated that the limestone from the Jayantipuram mine shows a wide range of variations in LOI (29.94% to 40.64%), SiO2 (6.14% to 27.18%), CaO (37.93% to 50.78%), Al2O3 (0.49% to 2.27%) and Fe2O3 (0.28% to 2.4%). MgO, k2O, Na2O, TiO2 and MnO2 are present in traces. CaO with LOI shows a strong positive correlation where as CaO with SiO2 shows a strong negative correlation because of mineralogical factors. The chemical composition of the limestone reflects its mineralogical composition. The distribution of various elements in the acid-soluble fraction has been studied by the factor analysis method in order to interpret in terms of their mineralogy, sedimentary environment and diagenesis. Mineralogy, recrystallization and other diagenetic changes are the main factors affecting the distribution of the elements and their mutual relationships in the limestone. The aim of this paper is also to analyze how significantly the two parameters, silica modulus and lime saturation factor, influence this low grade siliceous limestone sample from the Jayantipuram mine of Andhra Pradesh, India, for the cement making process from the geochemical data.

关键词：灰岩样品水泥生产地球化学硅质石灰石矿评估因子分析方法化学数据处理

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Maximizing Solar Potential Using the Differential Grey Wolf Algorithm for PV System Optimization

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Energy Engineering 2024年第8期121卷 2129-2142页

作者： Ezhilmathi Nagarathinam Buvana Devaraju karthiyayini Jayamoorthy Padmavathi Radhakrishnan Santhana Lakshmi ChandraMohan vijayakumar Perumal karthikeyan Balakrishnan Department of Electrical and Electronics Engineering Pandian Saraswathiyadav Engineering CollegeSivagangaiTamil Nadu630561India Department of Electrical and Electronics Engineering Sri Balaji Chockalingam Engineering CollegeArniTamil Nadu632317India Department of Information Science and Engineering New Horizon College of EngineeringBangalore560103India Department of Electrical and Electronics Engineering Rajalakshmi Engineering CollegeChennaiTamil Nadu602105India Department of Electrical and Electronics Engineering Sona College of TechnologySalemTamil Nadu636005India School of Electronics Engineering Vellore Institute of TechnologyChennaiTamil Nadu600127India Department of Electrical and Electronics Engineering Sri Krishna College of Engineering and TechnologyCoimbatoreTamil Nadu641008India

Maximum Power Point Tracking(MPPT)is crucial for maximizing the energy output of photovoltaic(PV)systems by continuously adjusting the operating point of the panels to track the point of maximum power production under changing environmental *** work proposes the design of an MPPT system for solar PV installations using the Differential Grey Wolf Optimizer(DGWO).It dynamically adjusts the parameters of the MPPT controller,specifically the duty cycle of the SEPIC converter,to efficiently track the Maximum Power Point(MPP).The proposed system aims to enhance the energy harvesting capability of solar PV systems by optimizing their performance under varying solar irradiance,temperature and shading *** results demonstrate the effectiveness of the DGWO-based MPPT system in maximizing the power output of solar PV installations compared to conventional MPPT *** research contributes to the development of advanced MPPT techniques for improving the efficiency and reliability of solar energy systems.

关键词： DGWO SEPIC converter MPPT PV module

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Ultimate Physical Reality of the Universe

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Journal of Modern Physics 2018年第3期9卷 387-394页

作者： Moolathurai Rangasamy vijayakumar Bharathiar University Coimbatore India

According to modern concepts, space continues in all directions, and has no known limits. The sun and billions of other stars make up a giant galaxy whirling through space. Countless other galaxies are scattered throughout space as far as man can see with the largest telescopes. The Newtonian uni-verse, Minkowski universe, Einstein’s General Relativistic Universe and the Big-Bang and Steady State models deal with creation and evolution of the universe. Following Einstein, Milne, Friedman, Lemaitre, De Sitter, Bondi and Gold, Hoyle, Narlikar and Brons Dicke have given their own models and tried to explain the nature of the universe. All the above mentioned concepts and models are not able to explain the Ultimate Physical Reality of the Universe. Here I suggest for the first time, the Ultimate Physical Reality of the Universe by explaining that there is no separate “space” without the presence of matter. I give the answer for the unexplained puzzling question: “What the universe expands into?” and explain that the universe is just closed and finite. I explain that the universe is ever expanding. I also give answers to important unan-swered questions so far.

关键词： Ultimate Reality of the Universe

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Laplace Decomposition Method for Time-Fractional Fornberg-Whitham Type Equations

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Journal of Applied Mathematics and Physics 2021年第2期9卷 260-271页

作者： Thilagarajah Mathanaranjan Dayalini vijayakumar Department of Mathematics and Statistics University of Jaffna Jaffna Northern Province Sri Lanka

In this study, the closed form of series solutions of the original and modified nonlinear time-fractional Fornberg-Whitham equations are derived by means of the Laplace decomposition method (LDM). The fractional order derivatives are expressed in the sense of Caputo. For the specific choice of parameters, the obtained solutions are compared with the exact solutions to validate the accuracy of this method. Numerical solutions are represented graphically which illustrate the behavior of the solutions. Further, the computations express that the above method is straightforward, and it desires the smaller size of computation.

关键词： Fractional Derivative Fractional Fornberg-Whitham Equation Laplace Transformation Adomian Decomposition Method

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Influence of Date of Transplanting on Growth and Yield Attributes and Resultant Seed Quality of Davana

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American Journal of Plant Sciences 2013年第9期4卷 1721-1724页

作者： M. Jayanthi A. vijayakumar k. Vananagamudi k. Rajamani Department of Medicinal and Aromatic Crops TamilNadu Agricultural University Coimbatore India. Department of Seed Science and Technology TamilNadu Agricultural University Coimbatore India

A field experiment was conducted at TamilNadu agricultural university, Coimbatore during rabi 2011 to study the effect of time transplanting on growth, yield attributes and resultant seed quality of davana. The experiment was laid out with five different dates of transplanting viz., October 15th, November 1st, November 15th, December 1st and December 15th with the spacing of 15 × 7.5 cm and 125:125:75 NPk kg/ha were adopted in a randomized block design with four replications. The results revealed that the seedlings transplanted at 15th November recorded the maximum number of branches/plant, seed yield/plant, seed yield/plot, resultant seed germination and vigour index.

关键词： Date of Transplanting Davana Seed Yield and Seed Quality

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