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Performance, emission and combustion characteristics of sea lemon oil and its diesel blends in a diesel engine

International Journal of Agricultural and Biological Engineering 2009年第3期2卷 69-75页

作者： V.S.Hariharan k.vijayakumar reddy k.Rajagopal Department of Mechanical Engineering Lakireddy Bali Reddy College of EngineeringMylavaramKrishna Dt.Andhra PradeshIndia Department of Mechanical Engineering JNTU College of EngineeringHyderabadIndia

Experimental tests have been carried out to evaluate the performance,emission and combustion characteristics of a diesel engine using neat sea lemon oil and its blends of 25%,50%,&75%and standard diesel fuel *** common problems posed when using vegetable oil in a compression ignition engine are poor atomization,carbon deposits,ring sticking *** is because of the high viscosity and low volatility of vegetable *** blended with diesel,sea lemon oil presented lower viscosity,improved volatility,better combustion and less carbon *** was found that there was reduction in NO for neat sea lemon oil and its diesel blends along with marginal increase in smoke,HC and CO emissions compared to that of standard *** thermal efficiency was slightly lower for neat sea lemon oil and its diesel *** the combustion analysis,it was found that sea lemon oil-diesel blends performed better than neat sea lemon oil.

关键词： sea lemon oil blends performance emission and combustion characteristics

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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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Synthesis and characterization of ZnS-based quantum dots to trace low concentration of ammonia

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Journal of Semiconductors 2021年第12期42卷 72-79页

作者： Uma Devi Godavarti P.Nagaraju vijayakumar Yelsani Yamuna Pushukuri P.S.reddy Madhavaprasad Dasari Nanosensor Research Laboratory Department of PhysicsCMR Technical CampusMedchalHyderabadTelangana 501401India Department of Physics Anurag UniversityHyderabadTelangana 500088India Department of Physics Mallareddy Engineering College(Autonomous)DulapallyHyderabad 500100India Department of Applied Sciences NIT GoaGoa 403401India Department of Physics Gitam UniversityVisakhapatnam(A.P.)530045India

In the present work,a solution-based co-precipitation method has been adopted to synthesize pure and cobalt-doped ZnS quantum dots and characterized by XRD,SEM,TEM with EDX,FTIR and gas sensing *** analysis has shown a single phase of ZnS quantum dots having a zinc blend *** and XRD line broadening indicated that the average crystallite size in the sample is in the range of 2 to 5 *** micrographs show spherical-shaped quantum *** studies show that cobalt has been successfully doped into the ZnS cubic *** spectra have analyzed the elemental presence in the samples and it is evident that the spectra confirmed the presence of cobalt(Co),zinc(Zn),oxygen(O),and sulphur(S)elements only and no other impurities are *** ZnS-based quantum dot sensors reveal high sensitivity towards 50 ppm of ammonia vapors at an operating temperature of 70℃.Hence,ZnS-based quantum dots can be a promising and quick traceable sensor towards ammonia sensing applications with good response and recovery time.

关键词： ZnS co-precipitation cobalt doped ZnS XRD quantum dots gas sensor ammonia response

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Optical, Structural and Morphological Properties of Photocatalytic ZnO Thin Films Deposited by Pray Pyrolysis Technique

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Modern Research in Catalysis 2016年第4期5卷 130-146页

作者： Durgam komaraiah Eppa Radha Y. vijayakumar J. Sivakumar M. V. Ramana reddy R. Sayanna Department of Physics University College of Science Osmania University Hyderabad India

Photocatalytic ZnO thin films have been deposited onto glass substrate by spray pyrolysis technique. The sprayed solution consists of 0.1 M of zinc acetate dihydrate dissolved in double distilled water and sprays onto ultrasonically cleaned glass substrates maintained at 350°C, through an air-atomizing nozzle. The X-ray diffraction (XRD), scanning electron microscopy (SEM), EDX and UV-VIS spectrophotometer were applied to describe the structural, morphological, compositional and optical properties of ZnO catalyst. XRD analysis confirms that the films were found to be single phase hexagonal wurtzite structure. The SEM micrograph of the films is shown highly uniform, crack free and found to be fiber like structures. The optical transmittance spectra of the ZnO thin films were found to be transparent to visible light and the average optical transmittance was greater than 85%. The direct optical band gap energy values of the films shift towards the lower energy as a consequence of the thermal annealing. The Urbach energy of the films was found to increase with annealing temperature. The refractive index of the films was calculated and the refractive index dispersion curve of the films obeys the single oscillator model. The values of oscillatory energy Eo, dispersion energy Ed, and static dielectric constant εs for the ZnO thin films were determined. The films were evaluated for their ability to degrade methylene blue. The Langmuir-Hinshelwood kinetic model was used to interpret quantitatively the observed kinetic experimental result. The photocatalytic activity of ZnO thin films was enhanced by annealing temperature.

关键词： ZnO Thin Film Spray Pyrolysis Optical Band Gap Refractive Index Photo Catalysis

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