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11 results on '"Patil, Omprakash"'

4. Identification of Phasi Charoen-Like Phasivirus in Field Collected

Author

Ashok, Munivenkatappa, Dimpal A, Nyayanit, Pragya D, Yadav, Manjushree, Rangappa, Savita, Patil, Triparna, Majumdar, Sreelekshmy, Mohandas, Diamond Prakash, Sinha, Manjunath M, Jayaswamy, and Patil, OmPrakash

Subjects
Aedes, Animals, India, RNA Viruses, Mosquito Vectors, Chikungunya virus
Published
2021

5. Identification of Phasi Charoen-Like Phasivirus in Field Collected Aedes aegypti from Karnataka State, India

Author

Sreelekshmy Mohandas, Patil OmPrakash, Ashok Munivenkatappa, Pragya D Yadav, Manjunath M Jayaswamy, Dimpal A Nyayanit, Savita Patil, Triparna Majumdar, Manjushree Rangappa, and D. P. Sinha

Subjects
Entomology, Disease surveillance, Veterinary medicine, biology, fungi, virus diseases, Outbreak, Aedes aegypti, Dengue virus, biology.organism_classification, medicine.disease_cause, Microbiology, Virus, Infectious Diseases, Virology, parasitic diseases, Genotype, medicine, Chikungunya
Abstract

Background: A wide range of insect-specific viruses (ISVs) have been reported worldwide. There are no studies from India that have reported ISVs. The current study describes the identification of Phasi Charoen-like virus (PCLV) from Aedes aegypti mosquito-pools from six districts of Karnataka state, India. Materials and Methods: During the Chikungunya virus (CHIKV) outbreak in the Bangalore Urban district in 2019, using conventional PCR, it was found that both human and mosquito samples were positive for CHIKV. For retrieve the complete genome sequence, mosquito samples were subjected to next generation sequencing (NGS) analysis and PCLV was also found. During 2019, as part of a vector-borne disease surveillance, we received 50 mosquito pool samples from 6 districts of the state, all of them were subjected to NGS to identify PCLV. Results: The A. aegypti mosquito-pools samples were subjected to the NGS platform that led to identification of an ISV, PCLV. PCLV was identified in 26 A. aegypti mosquito-pools collected from 6 districts. We also found mixed infection of PCLV with the Dengue virus (DENV; genotypes 1 and 3) and CHIKV from five pools. The nucleotide identity for the L gene of Indian PCLV sequences ranged between 97.1% and 98.3% in comparison with the Thailand sequences. Conclusions: To the best of our knowledge, this is the first report of PCLV dual infection with DENV and CHIKV in India. The present study confirms the presence of PCLV in A. aegypti mosquitoes from Karnataka state. The study adds India in the global geographical distribution of PCLV.

Published
2021

7. Experimental studies on transcritical CO2 heat pump system for simultaneous water cooling and heating application.

Author

Date, Abhijit, Patil, Omprakash, Shet, Shrikant A, and Agrawal, Neeraj

Subjects
HYDRONICS, HEAT pumps, RESPONSE surfaces (Statistics), FACTORIAL experiment designs, EXPERIMENTAL design
Abstract

An in-house transcritical CO2 heat pump experimental facility was developed for simultaneous cooling and heating of water. Hand-operated (Needle) valve is used as an expansion device to control the gas cooler pressure and mass flow rate of refrigerant. The tests were conducted to study the performance of the system and components at various operating conditions. Four independent input operating variables and four output variables are considered for investigation. The factorial experimental design was employed to achieve the optimum set of experiments. Taguchi L9 array is used to design experiments for chosen variables and results were analyzed by using response surface methodology (RSM). It is observed that system charging pressure and degree of expansion valve opening affect the system performance greatly. Maximum cooling and heating output from the system was recorded as 3.8 kW and 6.6 kW, respectively, and the corresponding system COP obtained was 3.1. Empirical correlations are developed employing RSM technique to predict the system performance. [ABSTRACT FROM AUTHOR]

Published
2022
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9. Energetic and exergetic studies of modified CO2 transcritical refrigeration cycles.

Author

Patil, Omprakash S, Shet, Shrikant A, Jadhao, Manish, and Agrawal, Neeraj

Subjects
*VORTEX tubes, *HEAT exchangers, *THERMODYNAMIC cycles, *HEAT recovery, *REFRIGERATION & refrigerating machinery
Abstract

Thermodynamic analysis including energetic and exergetic analysis is carried out employing Engineering Equation Solver for the five modified cycles: dual expansion cycle, internal heat exchanger cycle, work recovery cycle, work recovery with internal heat exchanger cycle and vortex tube expansion cycle. Contours are developed to study the effect of gas cooler temperatures and evaporator temperatures on the system performance and optimum gas cooler pressure. The modified cycle with work recovery turbine offers relatively higher COP and higher exergetic efficiency with lower compressor discharge pressure. The exergy loss in compressor, gas cooler, throttle valve and vortex tube (VT) are considerably higher than that in internal heat exchanger (IHX), evaporator and turbine. It is observed that COP of modified cycle with VT is slightly less than that with IHX, whereas the cycle with work recovery turbine brings the highest COP with the improvement of 25% at the gas cooler exit temperature of 305 K and evaporator temperature of 248 K. [ABSTRACT FROM AUTHOR]

Published
2021
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