检索结果-南通市图书馆

Open Journal of Fluid Dynamics 2022年第1期12卷 56-68页

作者： Mahesh Kumar Ramachandraiah savitha basavaraju MES Pre-University College of Arts Commerce and Science Bengaluru India Raja Rajeswari College of Engineering Bengaluru India

This paper investigated the buoyancy and surface tension-driven ferro-thermal-convection (FTC) in a ferrofluid (FF) layer due to influence of general boundary conditions. The lower surface is rigid with insulating to temperature perturbations, while the upper surface is stress-free and subjected to general thermal boundary condition. The numerically Galerkin technique (GT) and analytically regular perturbation technique (RPT) are applied for solving the problem of eigenvalue. It is analyzed that increasing Biot number, decreases the magnetic and Marangoni number is to postponement the onset. Additionally, magnetization nonlinearity parameter has no effect on FTC in the non-existence of Biot number. The results under the limiting cases are found to be in good agreement with those available in the literature.

关键词： Marangoni Number Ferrothermal Convection Insulating Regular Perturbation Technique Galerkin Technique

Synthesis of plant-based biogenic jarosite nanoparticles using Azadirachta indica and Eucalyptus gunni leaf extracts and its application in Fenton degradation of dicamba

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Water Science and Engineering 2024年第2期17卷 157-165页

作者： Shivaswamy Bhaskar basavaraju Manu Marikunte Yanjarappa Sreenivasa Arlapadavu Manoj Department of Civil Engineering National Institute of Technology CalicutKozhikode 673601KeralaIndia Deparment of Civil Engineering National Instute of Techogy KamatakaSurahalP.Srinivasnaga Mangaore5725Indi Department of Studies in Microbiology University of MysoreMysuru 570006KarnatakaIndia Department of Civil Enginering Siddaganga Institute of TechnologyTumkur 572103India

Bio-jarosite,an iron mineral synthesized biologically using bacteria,is a substitute for iron catalysts in the Fenton oxidation of organic *** nanocatalysts have been widely used as Fenton catalysts because they have a larger surface area than ordinary catalysts,are highly recyclable,and can be treated *** study aimed to explore the catalytic properties of bio-jarosite iron nanoparticles syn-thesized with green methods using two distinct plant species:Azadirachta indica and Eucalyptus *** focus was on the degradation of dicamba via Fenton *** synthesized nanoparticles exhibited different particle size,shape,surface area,and chemical composition *** particles were effective in removing dicamba,with removal efficiencies of 96.8%for *** bio-jarosite iron nano-particles(ABFeNPs)and 93.0%for *** bio-jarosite iron nanoparticles(EBFeNPs)within 120 min of *** the catalyst dosage by 0.1 g/L resulted in 7.6%and 43.0%increases in the dicamba removal efficiency for EBFeNPs and ABFeNPs with rate constants of 0.025 min^(-1) and 0.023 min^(-1),respectively,confrming their catalytic ***,the high efficiency of both catalysts was demonstrated through five consecutive cycles of linear pseudo-first-order Fenton oxidation reactions.

关键词： Acidithiobacillus ferrooxidans Fenton process Jarosite Herbicide Dicamba Azadirachta indica Eucalyptus gunni

Bismuth Modified Porous Silica Preparation,Characterization and Photocatalytic Activity Evaluation for Degradation of Isoproturon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2013年第7期29卷 639-646页

作者： Anil Kumar Reddy Police Srinivas basavaraju Durga Kumari Valluri Subrahmanyam Machiraju Inorganic and Physical Chemistry Division Indian Institute of Chemical TechnologyHyderabad 500607India

Porous silica prepared by using an acrylic emulsion has been impregnated with bismuth ion resulting in Bi2Si05 species containing surface. The as-prepared materials have been characterized by X-ray diffraction spectroscopy （XRD）, X-ray photoelectron spectroscopy （XPS）, UV-Vis diffuse reflectance spectroscopy （UV-Vis DRS）, scanning electron microscopy （SEM）, energy dispersive analysis of X-ray （EDAX）, transmission electron microscopy （TEM）, Fourier transform infrared spectroscopy （FTIR） and N2 adsorption/desorption techniques. EDAX analysis confirms the penetration of bismuth ions into the framework of silica to form Bi2SiO5, which is substantiated by XRD. The UV-Vis DRS shows that the catalysts are optically active and XPS confirms the inclusion of bismuth into the framework of silica. FTIR spectra illustrate the formation of Bi-O-Si linkages in the porous silica framework. SEM and TEM show the spherical morphology, whereas N2 adsorption/desorption study confirms the porosity of the prepared materials. The photocatalytic activity of the material is evaluated for the degradation of isoproturon herbicide and it is found that the material is active as compared to the commercial P-25 Degussa TiO2.

关键词： Acrylic emulsion Emulsion polymerization technique Porous silica Bi2SiO5 Photocatalyfic degradation lsoproturon

Glass and Mineral Chemistry of Northern Central Indian Ridge Basalts:Compositional Diversity and Petrogenetic Significance

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2009年第6期83卷 1122-1135页

作者： Dwijesh RAY Ranadip BANERJEE Sridhar D IYER basavaraju BASAVALINGU Subir MUKHOPADHYAY4 National Centre for Antarctic and Ocean Research National Institute of Oceanography CSIR Department of Studies in Geology University of Mysore Department of Geological Sciences Jadavpur University

The glass and mineral chemistry of basaits examined from the northern central Indian ridge （NCIR） provides an insight into magma genesis around the vicinity of two transform faults： Vityaz （VT） and Vema （VM）. The studied mid-ocean ridge basalts （MORBs） from the outer ridge flank （VT area） and a near-ridge seamount （VM area） reveal that they are moderately phyric plagioclase basalts composed of plagioclase （phenocryst [An60-90] and groundmass [An35-79]）, olivine （Fo81-88）, diopside （Wo45-51, En25-37, Fs14-24）, and titanomagnetite （FeOt -63.75 wt% and TiO2 -22.69 wt%）. The wholerock composition of these basalts has similar Mg# [mole Mg/mole（Mg＋Fe2＋）] （VT basalt： -0.56-0.58; VM basalt： -0.57）, but differ in their total alkali content （VT basalt： -2.65; VM basalt： -3.24）. The bulk composition of the magma was gradually depleted in MgO and enriched in FeOt, TiO2, P2O5, and Na2O with progressive fractionation, the basalts were gradually enriched in Y and Zr and depleted in Ni and Cr. In addition, the ∑REE of magma also increased with fractionation, without any change in the （La/ Yb）N value. Glass from the VM seamount shows more fractionated characters （Mg#： 0.56-0.57） compared to the outer ridge flank lava of the VT area （Mg#： 0.63-0.65）. This study concludes that present basalts experienced low-pressure crystallization at a relatively shallow depth. The geochemical changes in the NCIR magmas resulted from fractional crystallization at a shallow depth. As a consequence, spinel was the first mineral to crystallize at a pressure 〉10 kbar, followed by Fe-rich olivine at 〈10 kbar pressure.

关键词： mineral chemistry fractional crystallization petrogenesis northern central Indian ridge

Effect of copper nanoparticles exposure in the physiology of the common carp(Cyprinus carpio):Biochemical,histological and proteomic approaches

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2016年第1期1卷 15-23页

作者： Yugantak Raj Gupta Durai Sellegounder Monica Kannan Seetharam Deepa Balasubramanian Senthilkumaran Yaraguntappa basavaraju Department of Animal Biology School of Life SciencesUniversity of HyderabadP.O.Central UniversityHyderabad 500046TelanganaIndia

Copper nanoparticles(Cu-NPs)are serious water pollutants but their impact in teleosts performance remains poorly *** the present study,we have exposed juvenile carps(Cyprinus carpio),a freshwater teleost edible in India to two different doses(20 and 100 mg/L)of Cu-NPs for seven *** doses selected were eco-relevant considering the contamination levels of certain water *** results indicated that the activity oxidative stress enzymes catalase,superoxide dismutase,and glutathione-S-transferase were significantly increased in the kidney,liver and gills of the treated groups when compared to *** analysis revealed that after exposure,disruption of the secondary lamellae of gills,liver damage with pyknotic nuclei and structural disarray of the kidney *** analysis of the liver showed down-regulation of several proteins including the ferritin heavy chain,rho guanine nucleotide exchange factor 17-like,cytoglobin-1 and up-regulation of diphosphomevalonate decarboxylase and selenide&water *** together,the results of suggest that short-term exposure of juvenile carp to Cu-NPs causes oxidative stress and impart serious deleterious effects in the tissues which may affect fish growth and development.

关键词： Catalase Superoxide dismutase Glutathione S-transferase Oxidative stress

Almond gum assisted synthesis of Mg doped Fe_(2)O_(3) NPs:Structural analysis,electrochemical sensing,and optical applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ChemPhysMater 2022年第4期1卷 330-337页

作者： Madanakumara Hanumanthappa Jayanna Halepoojar Siddalingappa Yellamagad Channabasaveshwara Soundeswaran Sundararajan Mruthyunjaya Vishwas Shyamala Kurki Srinivasaiah Surendra Boppanahalli Siddegowda basavaraju Nandeesh Department of Physics Dr Ambedkar Institute of TechnologyBangalore 560056India Department of Physics Kuvempu UniversityShankaraghatta Shimoga 577451India Yellamagad Channabasaveshwara c Soundeswaran Sundararajan Mruthyunjaya Vishwas e Shyamala Kurki Srinivasaiah fSurendra Boppanahalli Siddegowda School of Physics and Geology Nrupathunga UniversityBangalore 560001India Department of Physics Mount Carmel CollegeBangalore 560001India Department of Chemistry Dayananda Sagar College of EngineeringBengaluru 560078India Department of Physics East West Institute of TechnologyBangalore 560091India

Mg-doped Fe_(2)O_(3)nanoparticles(M-FNPs)are successfully prepared first time by facile green-aided(almond gum)combustion *** structural analysis of synthesized nanoparticles was well analyzed by Powder X-ray Diffrac-tion(PXRD),Fourier Transform Infrared spectroscopy(FT-IR),Scanning Electron Microscope(SEM),Raman spec-troscopy and UV-Visible spectral *** showed a nanocrystalline nature and determined the average particle size to be 85 *** surface morphologies of the prepared nanocomposite was measured by SEM tech-nique reveals the porous and spongy like *** photodegradation activity on 20×10^(−6)of Fast Orange Red(FOR)organic model dye using M-FNPs(50 mg)under UV light irradiation was investigatedin ***-trochemical examination of the prepared material was conducted using graphite-M-FNP electrode paste in 0.1 M KCl solution,and its performance in redox reaction was determined to be very good via cyclic voltammetry and electrochemical impedance ***,an extension to sensor studies revealed broad differences in redox positions for paracetamol sensors,at 0.64 V and 0.41 V,confirming highly chemical sensor activity in alkaline medium for 1∼5 mM concentrations.

关键词： Mg doped Fe_(2)O_(3)photocatalyst Green combustion Electrochemical analysis Photocatalysis

Estimation of Reducing Sugar by Acid Hydrolysis of Sunflower (Helianthus annuus) Husk by Standard Methods

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Sciences 2016年第5期7卷 322-325页

作者： Siddegowda Chandraju Rachnayak Venkatesh Chandraju Sadolalu Chidan Kumar basavaraju Ajay Kumar Department of Studies in Sugar Technology and Chemistry Sir M. Vishweshwaraya Post-Graduate Center University of Mysore Mandya India Department of Engineering Chemistry Alva’s Institute of Engineering & Technology Shobhavana Campus Moodbidri India

Sunflower husk consists the primary and secondary plant nutrients—phosphorus (10.94% P2O5), potassium (25.84% K2O), calcium (19.07% CaO), magnesium (18.58% MgO), and also some micronutrients (zinc, copper, cobalt, manganese, iron, and molybdenum). The sunflower husk has low plasticity, and the granulation process occurs better when binding materials (sugar factory lime, molasses, urea formaldehyde resin) are used. Sun flower husk is a polysaccharide source that can be converted to reducing sugars. Sunflower husk was hydrolyzed using sulphuric acid (0.2N) at a temperature of 65°C - 70°C. It was observed that the degradation has significant effect with respect to amount of husk taken and in turn sugar yield is around 40% - 50%, each of which is estimated by Bertrand’s, Benedict’s and Lane-Eyon method.

关键词： Degradation Hydrolysis Sunflower Husk Sugar Estimation

Photocatalytic Degradation of Isoproturon Pesticide on C, N and S Doped TiO2

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2010年第3期2卷 235-244页

作者： Police Anil Kumar Reddy Pulagurla Venkata Laxma Reddy Vutukuri Maitrey Sharma basavaraju Srinivas Valluri Durga Kumari Machiraju Subrahmanyam 不详

TiO2 doped with C, N and S (TCNS photocatalyst) was prepared by hydrolysis process using titanium iso-propoxide and thiourea. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photo electron spectroscopy (XPS), BET surface area, FTIR and diffuse reflectance spectra (DRS). The results showed that the prepared catalysts are anatase type and nanosized par-ticles. The catalysts exhibited stronger absorption in the visible light region with a red shift in the adsorption edge. The photocatalytic activity of TCNS photocatalysts was evaluated by the photocatalytic degradation of isoproturon pesticide in aqueous solution. In the present study the maximum activity was achieved for TCNS5 catalyst at neutral pH with 1 g L-1 catalyst amount and at 1.14 x 10-4 M concentration of the pesticide solution. The TCNS photocatalysts showed higher phtocatalytic activity under solar light irradiation. This is attributed to the synergetic effects of red shift in the absorption edge, higher surface area and the inhibition of charge carrier recombination process.

关键词： Isoproturon Pesticide Degradation C N and S Doped TiO2 Visible Light Active Catalysts