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Search Results: 1 - 10 of 692588 matches for " M.V.S.Murali Krishna "
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Performance Evaluation of Mohr Oil Based Biodiesel in Low Grade Low Heat Rejection Diesel Engine
T.RATNA REDDY,M.V.S.MURALI KRISHNA,CH. KESAVA REDDY,P.V.K.MURTHY
International Journal of Innovative Research in Science, Engineering and Technology , 2013,
Abstract: Investigations were carried out to evaluate the performance of a low grade low heat rejection (LHR) diesel engine with ceramic coated cylinder head with 3-mm air gap with different operating conditions [normal temperature and pre-heated temperature] of mohr oil based biodiesel (MOBD) with varied injection pressure and injection timing. Performance parameters of brake thermal efficiency, exhaust gas temperature, volumetric efficiency and sound intensity were determined at various values of brake mean effective pressure (BMEP).Exhaust emissions of smoke and oxides of nitrogen (NOx) were recorded at the various values of BMEP. Combustion characteristics at peak load operation of the engine were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package. Conventional engine (CE) showed compatible performance, while LHR engine showed marginally increased performance with MOBD operation at recommended injection timing and pressure. The performance of both version of the engine improved with advanced injection timing and at higher injection pressure when compared with CE with pure diesel operation. The optimum injection timing was 33obTDC for CE while it was 29.5obTDC with LHR engine with MOBD operation. Peak brake thermal efficiency increased by 13%, at peak load operation- brake specific energy consumption (BSEC), coolant load, volumetric efficiency, smoke levels and sound intensity decreased by 4%, 15%, 7%, 27%, 24% respectively while NOx levels increased by 47% with MOBD operation on LHR engine at its optimum injection timing when compared with diesel operation on CE at manufacturer’s recommended injection timing of 27obTDC. (Before top dead centre)
Exhaust Emissions and Combustion Characteristics of Jatropha Oil in Crude Form and Biodiesel of Low Heat Rejection Diesel Engine
N.Janardhan,P.Ushashri,M.V.S.Murali Krishna,P.V.K.Murthy
International Journal of Soft Computing & Engineering , 2013,
Abstract: —Investigations were carried out to study the exhaust emissions of a low heat rejection (LHR) diesel engine consisting of air gap insulated piston with 3-mm air gap, with superni (an alloy of nickel) crown, air gap insulated liner with superni insert and ceramic coated cylinder head with different operating conditions of crude jatropha oil (CJO) and biodiesel with varied injection timing and injection pressure. Performance parameters and exhaust emissions were determined at various values of brake mean effective pressure (BMEP) with different versions of the engine with varied injection timing and injection pressure with different operating conditions of jatropha oil in crude form and biodiesel. Combustion characteristics of the engine were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package at peak load operation of the engine. Conventional engine (CE) showed deteriorated performance, while LHR engine showed improved performance with crude vegetable operation at recommended injection timing and pressure and the performance of both version of the engine improved with advanced injection timing and higher injection pressure when compared with CE with pure diesel operation. Relatively, smoke levels decreased by 27% and NOx levels increased by 49% with crude vegetable oil operation on LHR engine at its optimum injection timing, when compared with pure diesel operation on CE at manufacturer’s recommended injection timing. Biodiesel operation further decreased smoke levels and increased NOx emissions.
Comparative Performance of Ceramic Coated Diesel Engine with Mohr Oil in Crude and Biodiesel Form
T. Ratna Reddy,M.V.S. Murali Krishna,Ch. Kesava Reddy,Jaya Prakash Narayan
International Journal of Engineering and Advanced Technology , 2013,
Abstract: Investigations were carried out to evaluate the performance of a low grade low heat rejection (LHR) diesel engine with ceramic coated cylinder head with 3-mm air gap with different operating conditions [normal temperature and pre-heated temperature] of crude mohr oil (CMO) and mohr oil based biodiesel (MOBD) with varied injection pressure and injection timing. Performance parameters of brake thermal efficiency, exhaust gas temperature, volumetric efficiency and sound intensity were determined at various values of brake mean effective pressure (BMEP).Exhaust emissions of smoke and oxides of nitrogen (NOx) were recorded at the various values of BMEP. Combustion characteristics at peak load operation of the engine were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package. Conventional engine (CE) showed compatible performance, while LHR engine showed marginally increased performance with vegetable oils (CMO & MOBD) operation at recommended injection timing and pressure. The performance of both version of the engine improved with advanced injection timing and at higher injection pressure when compared with CE with pure diesel operation.
Performance of Biodiesel in Low Heat Rejection Diesel Engine with Catalytic Converter
N. Janardhan,P.Ushasri,M.V.S. Murali Krishna,P.V.K.Murthy
International Journal of Engineering and Advanced Technology , 2012,
Abstract: Investigations were carried out to evaluate the performance of a low heat rejection (LHR) diesel engine consisting of air gap insulated piston with 3-mm air gap, with superni (an alloy of nickel) crown and air gap insulated liner with superni insert with different operating conditions of jatropha oil based bio-diesel with varied injection timing and injection pressure. Performance parameters were determined at various values of brake mean effective pressure (BMEP) of the engine. The effect of void ratio, temperature of catalyst, space velocity on the reduction of oxides of nitrogen (NOx) in the exhaust of the engines was studied. Exhaust emissions of smoke and oxides of nitrogen (NOx) were determined at various values of BMEP. The emission levels of NOx in LHR engine were controlled by means of the selective catalytic reduction technique using lanthanum ion exchanged zeolite (catalyst-A) and urea infused lanthanum ion exchanged zeolite (catalyst-B) with different versions of the engine at peak load operation of the engine. Conventional engine (CE) showed deteriorated performance, while LHR engine showed improved performance with bio-diesel at recommended injection timing of 27obTDC (before top dead centre) and pressure of 190 bar. The performance of both version of the engine improved with advanced injection timing and higher injection pressure when compared with CE with pure diesel operation. Peak brake thermal efficiency increased by 10%, smoke levels decreased by 15% and NOx levels increased by 41% with vegetable oil operation on LHR engine at its optimum injection timing, when compared with pure diesel operation on CE at 27obTDC and 190 bar. NOx emissions reduced by 40-50% by this technique with catalyst-A and catalyst-B.
Is it possible to accommodate massive photons in the framework of a gauge-invariant electrodynamics?
Fonseca, M.V.S.;Paredes, A.V;
Brazilian Journal of Physics , 2010, DOI: 10.1590/S0103-97332010000300011
Abstract: the construction of an alternative electromagnetic theory that preserves lorentz and gauge symmetries, is considered. we start off by building up maxwell electrodynamics in (3+1)d from the assumption that the associated lagrangian is a gauge- invariant functional that depends on the electron and photon fields and their first derivatives only. in this scenario, as well- known, it is not possible to set up a lorentz invariant gauge theory containing a massive photon. we show nevertheless that there exist two radically different electrodynamics, namely, the chern- simons and the podolsky formulations, in which this problem can be overcome. the former is only valid in odd space- time dimensions, while the latter requires the presence of higher- order derivatives of the gauge field in the lagrangian. this theory, usually known as podolsky electrodynamics, is simultaneously gauge and lorentz invariant; in addition, it contains a massive photon. therefore, a massive photon, unlike the popular belief, can be adequately accommodated within the context of a gauge- invariant electrodynamics.
PCR identification of Mycobacterium tuberculosis complex in a clinical sample from a patient with symptoms of tuberculous spondylodiscitis
Ribeiro, M.A.;Barouni, A.S.;Augusto, C.J.;Augusto, M.V.S.;Lopes, M.T.P.;Salas, C.E.;
Brazilian Journal of Medical and Biological Research , 2007, DOI: 10.1590/S0100-879X2006005000033
Abstract: a 42-year-old male complaining of thoracic spine pain was admitted to the hospital for evaluation. an x-ray and computer tomography of the thoracic spine showed spondylodiscitis of the l3 lumbar and l2-l3 intervertebral disk. the tuberculin skin test (ppd) was strongly positive. a radioscopy-guided fine needle aspirate of the affected area was cultured but did not reveal the cause of the disease. two biopsy attempts failed to reveal the cause of the disease by culturing or by acid-fast-resistant staining (ziehl neelsen) of the specimens. a third biopsy also failed to detect the infectious agent by using microbiological procedures, but revealed the presence of a 245-bp amplicon characteristic of the mycobacterium tuberculosis complex after pcr of the sample. the result demonstrates the efficacy of pcr for the identification of m. tuberculosis in situations in which conventional diagnosis by culturing techniques or direct microscopy is unable to detect the microorganism. following this result the patient was treated with the antituberculous cocktail composed by rifampicin, pirazinamide and isoniazid during a six-month period. at the end of the treatment the dorsalgia symptoms had disappeared.
POST COITAL FOURTH DEGREE RECTOVAGINOPERINEAL TEAR: A RARE CASE REPORT
Shashidhar Boraiah, Sheela S.R. and Krishna Shetty M.V.
International Journal of Pharmaceutical Sciences and Research , 2012,
Abstract: Postcoital vaginal rupture or tear is a well-known entity to the gynecologist. We highlight case of a marital post coital rectovaginal tear with fecal incontinence and complete avulsion of anal sphincters. Patient underwent layered repair and sphincter reconstruction after bowel preparation. Postoperatively she had a satisfactory continence over flatus and feces.
FISH DIVERSITY DHANEGAON RESERVOIR, DHANEGAON, TQ. KALLAMB, DIST. OSMANABAD, MAHARASHTRA (INDIA)
M.V. LOKHANDE,V. S. SHEMBEKAR
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: The fish populations of our aquatic system play a significant role for the human economy. Dhanegaon reservoir is a perennial water resource for human consumption and also useful for agricultural in Osmanabad district. It is situated in taluka Kallamb. It is 60 km away from Latur district. In Latur and Osmanabad district some of the agricultural farmers with the help of F.I.D.A. are constructing fish ponds in their agriculture farms. Hence the present study has been under taken to show the role of fisheries in food production and development of agro based industries. The fish diversity is correlated with biological and various physico-chemical parameters that regulate the productivity and distribution of different species of the fishes. The present study is an attempt to document the fish fauna in the Dhanegaon reservoir during June 2003-May2005. About 21 species of fishes belonging 19 genera and 8 families from 3 orders. The important physic-chemical parameters were studied.
Molecular approach of the fragile chromosomal region Xq31-34 in cattle (Bos taurus) by microdissection and DOP-PCR
Llambí, S.;Arruga, M.V.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2008, DOI: 10.1590/S0102-09352008000400023
Abstract: fragile sites (fs) are chromosomal regions where the normal compactation of chromatine is not observed. fraxa (fra xq27.3, x sexual chromosome) is one of the most studied fs in humans. fraxa is an expansion of the trinucleotide cgg located in the gene fmr-1. in cattle, sites of chromosomal fragility were reported in btax, associated with different pathologies and fertility impairment. chromosomal microdissection has became a valuable tool for isolating chromatine fragments. in this work, it was combined the chromosomal microdissection technique with dop-pcr in order to carry out a molecular analysis of the fragile chromosomal region btaxq31-34. in that region, polymorphic dna-rapd sequences (gc rich) are present and sequences of the gene fmr-1 are missing. the results showed the usefulness of the microdissection-dop-pcr technique for molecular characterization of fragile chromosomal sites in cattle.
Analysis of the Membrane Proteins of an Antarctic Bacterium Pseudomonas Syringae
M.V. Jagannadham and S. Saranya
Proteomics Insights , 2012, DOI: 10.4137/PRI.S5383
Abstract: The proteins of an Antarctic bacterium Pseudomonas syringae Lz4W, identified earlier by different membrane protein preparation methods, were combined together and the redundant identities removed. In total, 1479 proteins including 148 outer membrane proteins from this bacterium were predicted by the algorithm PSORTb3.0. A detailed analysis on their subcellular localization was undertaken which was determined using TMHMM, TMB-hunt and BOMP. A comparison of PSORTb predicted outer membrane proteins with BOMP, revealed that most of the proteins predicted by the former, contained –barrels in the outer membranes. A comparative analysis of PSORTb, TMHMM and TMB-hunt reveals that most of the outer membranes proteins of this bacterium could be identified using this approach. Thus, by using a combination of biochemical and different bioinformatics algorithms, the membrane proteins of P. syringae are analyzed. In particular, PSORTb results are compared and supported by other algorithms, to improve the strength of OM proteins prediction. Several proteins, having an important role in cold adaptation of the organism, could also be identified.
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