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Search Results: 1 - 10 of 472416 matches for " M. T. Dhotre "
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Large Eddy Simulation for Dispersed Bubbly Flows: A Review
M. T. Dhotre,N. G. Deen,B. Niceno,Z. Khan
International Journal of Chemical Engineering , 2013, DOI: 10.1155/2013/343276
Abstract:
Large Eddy Simulation for Dispersed Bubbly Flows: A Review
M. T. Dhotre,N. G. Deen,B. Niceno,Z. Khan,J. B. Joshi
International Journal of Chemical Engineering , 2013, DOI: 10.1155/2013/343276
Abstract: Large eddy simulations (LES) of dispersed gas-liquid flows for the prediction of flow patterns and its applications have been reviewed. The published literature in the last ten years has been analysed on a coherent basis, and the present status has been brought out for the LES Euler-Euler and Euler-Lagrange approaches. Finally, recommendations for the use of LES in dispersed gas liquid flows have been made. 1. Introduction Gas-liquid flows are often encountered in the chemical process industry, but also numerous examples can be found in petroleum, pharmaceutical, agricultural, biochemical, food, electronic, and power-generation industries. The modelling of gas-liquid flows and their dynamics has become increasingly important in these areas, in order to predict flow behaviour with greater accuracy and reliability. There are two main flow regimes in gas-liquid flows: separated (e.g., annular flow in vertical pipes, stratified flow in horizontal pipes) and dispersed flow (e.g., droplets or bubbles in liquid). In this work, we consider only dispersed bubbly flows. Dispersed Bubbly Flow. The description of bubbly flows involves modelling of a deformable (gas-liquid) interface separating the phases; discontinuities of properties across the phase interface; the exchange between the phase; and turbulence modelling. Most of the dispersed flow models are based on the concept of a domain in the static (Eulerian) reference frame for description of the continuous phase, with addition of a reference frame for the description of the dispersed phase. The dispersed phase may be described in the same static reference frame as the continuous, leading to the Eulerian-Eulerian (E-E) approach or in a dynamic (Lagrangian) reference frame, leading to the Eulerian-Lagrangian (E-L) approach. In the E-L approach, the continuous liquid phase is modelled using an Eulerian approach and the dispersed gas phase is treated in a Lagrangian way; that is, the individual bubbles in the system are tracked by solving Newton’s second law, while accounting for the forces acting on the bubbles. An advantage here is the possibility to model each individual bubble, also incorporating bubble coalescence and breakup directly. Since each bubble path can be calculated accurately within the control volume, no numerical diffusion is introduced into the dispersed phase computation. However, a disadvantage is, the larger the system gets the more equations need to be solved, that is, one for every bubble. The E-E approach describes both phases as two continuous fluids, each occupying the entire domain,
Determination of Probiotic properties of lactic acid bacteria isolated from animal sources and its comparison with commercially available probiotic preparations
M. A. Dhotre,V. S. Shembekar
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: Probiotics means live microorganisms that have beneficial effects on their host's health. Although probiotic strains can be isolated from many sources; for fish applications the main criteria is animal origin. Atotal of 15 milk samples (05 each from Cow, Buffalo and Goat) were analyzed. Out of these 11 isolates were identified as prominent probiotics, among them 3 isolates each from Cow, Buffalo and Goat were excellent probiotics. The probiotic properties of the isolated and bacteria from commercial sources were confirmed by performing seven different tests e.g. Catalase test, bacteriocin assay, ,organic acid production study, resistance to acidic conditions, tolerance to bile, auto aggregation study and co-aggregation study. The collective score of all probiotic properties was used to determine its probiotic potential which was compared with probiotic potential of bacteria from commercial probiotic preparations. The isolated bacteria exhibited excellent probiotic characteristics. Study suggested that use of these isolated probiotic bacteria can be a remedy to treat the bacterial infections in aquaculture, because infectious diseases are the biggest problem in aquaculture and every year several infections are responsible for significant morbidity and mortality of fishes and lead to commercial loss for aquaculture business.
Advances in Computational Fluid Dynamics
Mahesh T. Dhotre,Nandkishor Krishnarao Nere,Sreepriya Vedantam,Mandar Tabib
International Journal of Chemical Engineering , 2013, DOI: 10.1155/2013/917373
Abstract:
Advances in Computational Fluid Dynamics
Mahesh T. Dhotre,Nandkishor Krishnarao Nere,Sreepriya Vedantam,Mandar Tabib
International Journal of Chemical Engineering , 2013, DOI: 10.1155/2013/917373
Abstract:
Generation, annotation, and analysis of ESTs from midgut tissue of adult female Anopheles stephensi mosquitoes
Deepak P Patil, Santosh Atanur, Dhiraj P Dhotre, D Anantharam, Vineet S Mahajan, Sandeep A Walujkar, Rakesh K Chandode, Girish J Kulkarni, Pankaj S Ghate, Abhishek Srivastav, Kannayakanahalli M Dayananda, Neha Gupta, Bhakti Bhagwat, Rajendra R Joshi, Devendra T Mourya, Milind S Patole, Yogesh S Shouche
BMC Genomics , 2009, DOI: 10.1186/1471-2164-10-386
Abstract: We obtained 7061 and 8306 ESTs from the sugar-fed and P. yoelii infected mosquito midgut tissue libraries, respectively. ESTs from the combined dataset formed 1319 contigs and 2627 singlets, totaling to 3946 unique transcripts. Putative functions were assigned to 1615 (40.9%) transcripts using BLASTX against UniProtKB database. Amongst unannotated transcripts, we identified 1513 putative novel transcripts and 818 potential untranslated regions (UTRs). Statistical comparison of annotated and unannotated ESTs from the two libraries identified 119 differentially regulated genes. Out of 3946 unique transcripts, only 1387 transcripts were mapped on the A. gambiae genome. These also included 189 novel transcripts, which were mapped to the unannotated regions of the genome. The EST data is available as ESTDB at http://mycompdb.bioinfo-portal.cdac.in/cgi-bin/est/index.cgi webcite.3946 unique transcripts were successfully identified from the adult female A. stephensi midgut tissue. These data can be used for microarray development for better understanding of vector-parasite relationship and to study differences or similarities with other malaria vectors. Mapping of putative novel transcripts from A. stephensi on the A. gambiae genome proved fruitful in identification and annotation of several genes. Failure of some novel transcripts to map on the A. gambiae genome indicates existence of substantial genomic dissimilarities between these two potent malaria vectors.Anopheles stephensi is a major malaria vector in the Indian subcontinent [1]. Rapid urbanization and development in the region has stimulated a corresponding increase in their population resulting in frequent malaria outbreaks [2]. Although, recent malaria epidemics occurred at higher frequencies, mortality was considerably low. For example during 2003, of the reported 1.78 million cases, only 1006 deaths were recorded in India [3].Absence of an efficient vaccine [4], evolution of drug-resistance in the parasites [5]
EXTRACTION, BIOCHEMICAL CHARACTERIZATION AND ANTIMICROBIALACTIVITY OF FISH MUCUS.
M.A.DHOTRE,P.D..BANSODE,V.S.SHEMBEKAR
Indian Streams Research Journal , 2013,
Abstract: Antimicrobial proteins and peptides play key roles in innate immunity and they had been observed from a wide variety of organisms in the last few years. The present study was undertaken to characterize antimicrobial peptides from the epidermal mucus of fishes collected from the Latur fish market. Antimicrobial properties of the fishes (Channa gachua, Channa punctatus, Cyprinus carpio and Arius dussumieri ) were tested against pathogenic bacteria and pathogenic fungi. The results of the present investigation reported that the mucus of the fishes having remarkable antimicrobial activity. In the present study efforts have been made to find the antimicrobial effect of the mucus of fresh water and river fishes namely Channa punctatus , Channa gachua, Cyprinus carpio and Arius dussumieri. Fish mucus was tested against pathogenic bacteria such as Escherichia coli, Klebsiella pneumoniae, Proteus vulgaris, Pseudomonas aeruginosa, Staphylococcus aureus, A.niger and C. albicans. The molecular masses of the peptides were 15 kDa and 200kDa as determined by SDS- polyacrylamide gel electrophoresis. This peptide had shown very effective activity against various human pathogens. The present findings suggest that fish mucus has very good antimicrobial activity against pathogenic microbes.
CFD Simulation of Transonic Flow in High-Voltage Circuit Breaker
Xiangyang Ye,Mahesh Dhotre
International Journal of Chemical Engineering , 2012, DOI: 10.1155/2012/609486
Abstract: A high-voltage circuit breaker is an indispensable piece of equipment in the electric transmission and distribution systems. Transonic flow typically occurs inside breaking chamber during the current interruption, which determines the insulating characteristics of gas. Therefore, accurate compressible flow simulations are required to improve the prediction of the breakdown voltages in various test duties of high-voltage circuit breakers. In this work, investigation of the impact of the solvers on the prediction capability of the breakdown voltages in capacitive switching is presented. For this purpose, a number of compressible nozzle flow validation cases have been presented. The investigation is then further extended for a real high-voltage circuit breaker geometry. The correlation between the flow prediction accuracy and the breakdown voltage prediction capability is identified.
A RETROSPECTIVE STUDY ON COEXISTENCE OF PULMONARY HYDATID CYST AND ASPERGILLOSIS
Anwesha Chatterjee, Goswami H.M., Dhotre S.V. Raval A.A.,Dharsandia M.V., Vegad M.M.
International Journal of Microbiology Research , 2000,
Abstract: Hydatid disease is a rare zoonotic disease. Rarely the hydatid cyst can become infected with mycotic organisms, such as Aspergillus. We describe a young male who presents with clinical features of suppurative lung abscess whose workup diagnosed hydatid cyst complicated by Aspergillus co-infection.A 32-year-old male farm labourer hospitalized with complaints of fever, chills, and productive cough with chest pain since four months duration Significant findings included leukocytosis with eosinophilia. Chestx-ray showing cystic lesion with air fluid level in Left lung suggestive of Hydatid cyst. CECT imaging of thorax and abdomen showed encysted left hydro pneumothoraxwith hypo dense cystic lesion in right lobe of liver,suggesting possibility of hydatid. The patient underwent decortication of the pulmonary cyst. Histopathologicalexamination of surgical specimen revealed cyst of 10 cm in its largest diameter showing cyst wall with thin branching septate hyphae with spores along with pink laminated wall like structure suggestive of hydatid cyst with aspergilloma. Aspergillosis and Hydatid cyst coexistance should be considered in presence of pulmonary cavitary lesion particularly in endemic areas. Detection of such association is important for planning adequate management.
Wireless Network: Performance Analysis of TCP
K.H. Walse,D.R. Dhotre
Information Technology Journal , 2007,
Abstract: In traditional networks (wired) TCP are tuned to perform well where packet losses occur due to congestion. In wireless networks losses can results from bit errors, fading and handoffs. There have been many schemes proposed to improve the performance of the TCP over network that have high BER wireless link. In this research, we compare two techniques designed to improve the performance of TCP in such networks, that have been proposed and simulated by various authors and we give analytical reviews on these proposals. These schemes are link-layer protocol that provides local reliability and split-connection protocol, that break the end-to-end connection into two parts at the base station. We discuss that some TCP sender adaptation work well for certain environments only, while others are generally useful. TCP responds to all losses by invoking congestion control and avoidance algorithms, resulting in degraded end-to-end performance in wireless and lossy systems. It is shown that a reliable link-layer protocol that is TCP-aware provides very good performance by shielding the TCP sender from duplicate acknowledgment caused by wireless losses improves throughput by 10-30%. Furthermore, it is possible to achieve good performance without splitting the end-to-end connection at the base station.
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