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RISS 인기검색어
- 검색키워드
- 저자 : V.V Subbarao (검색결과 4 건)
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Acreage estimation of kharif rice crop using Sentinel-1 temporal SAR data
Subbarao Nandepu V. V. S. S. Teja,Mani Jugal Kishore,Shrivastava Ashish,Srinivas Kumar Samayamantula,Varghese A. O. 대한공간정보학회 2021 Spatial Information Research Vol.29 No.4
Rice is one of the most important food crop in India covering about one-fourth of the total cropped area. India is the second largest producer and consumer of rice and accounts for 21% of the world’s total rice production. Rice is fundamentally a kharif season crop and grown in mainly rainfed areas. Recently there is a considerable increase in production, area and yield of rice crop in India. Temporal monitoring of crop area under cultivation is essential for the sustainable management of agricultural activities on both national and global levels. The present study is envisaged to estimate area under kharif rice using multi-temporal Sentinel-1 Synthetic Aperture Radar (SAR) data with dual polarization (VH and VV) in Bhandara district of Maharashtra. The geographical area of Bhandara district is 4087 square kilometres and lies in between 20640 030 ’ to 21600 180 ’ N latitude and 79440 930 ’ to 80080 700 ’ E longitude. The rice area is extracted using Random Forest (RF) classification techniques available in SNAP tool and validated using the ground observation collected from the field. An area of 1760 square kilometres was found under kharif rice out of 4087 square kilometres area of entire Bhandara district. The rice is predominant crop and covered around 43% of the total geographical area of Bhandara district during kharif season. The user accuracy (omission error), producer accuracy (commission error) for rice crop, overall accuracy and Kappa coefficients were 82.7, 90.0, 91% and 0.80, respectively. The study found that SAR data can be successfully used for acreage estimation with RF classifier.
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Shrivastav Awani,Goswami Tridib K.,Kotra Subbarao V. 한국농업기계학회 2022 바이오시스템공학 Vol.47 No.3
Purpose The freezing technique and rheological properties play an important role in improving the viscoelastic as well as the textural properties of ice cream. Methods Viscoelastic properties of ice creammix and ice creamwere measured by varying the concentration of gelatin (from0.2 to 0.6%) using the oscillatory test at different frequencies. The rheological analysis was carried out at temperatures 4 °C and − 4 °C which is the temperature of ice cream, before and after carrying out the freezing process, respectively. In ice creammix and ice cream, the values of storage modulus (G′), loss modulus (G″), and tan δ (G″/G′) were calculated from 0.2 to 0.6% gelatin concentration which was prepared by liquid nitrogen (LN2) infusion method. The adaptive neuro-fuzzy logic approach was applied to test the validity of sensory scores obtained in terms of the overall acceptability of ice cream. Results It was found that the viscoelastic property of ice cream was significantly influenced (p ≤ 0.01) by increasing the concentration of gelatin in ice cream and can be successfully added up to the concentration level of 0.4%, beyond which it results in the stiffness of ice cream reducing the quality of ice cream. Also, it was found that the average percentage error in the present ANFIS model was 5.85% with a correlation coefficient of 0.866 which indicates a good amount of correlation between predicted and experimental values. Conclusion The results of this study would be helpful in the further study of quick freezing of ice cream by LN2 infusion method by varying stabilizer concentration which is getting more common nowadays in western countries.
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K.Venkateswarlu,B.S.R Murthy,V.V Subbarao 보안공학연구지원센터 2015 International Journal of Bio-Science and Bio-Techn Vol.7 No.2
Performance, combustion and emission results of the diesel engine fueled with biodiesel blends with cetane improver as additive are presented in this paper. Cetane improver Ethyl Hexyl Nitrate (EHN) as 0.5% and 1% by volume is added as an additive to diesel-biodiesel blends. Experiments were conducted on a single cylinder, four stroke, and naturally aspirated, direct injection diesel engine with the said fuels using Exhaust Gas Recirculation (EGR) to analyze the performance, combustion and emissions. Experimental results reveal that both cylinder pressure and Heat Release Rate (HRR) decreased with increase in blend percentage and EGR as well. With increase in EHN percentage, CO and HC emissions decreased considerably while NOx decreased marginally. Smoke increases with increase in both EHN and EGR, however, at a particular EGR, blends with cetane improver present the better performance with improved emissions.
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