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RISS 인기검색어
- 검색키워드
- 저자 : S. Sengupta (검색결과 52 건)
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Maji, M.D.,Sengupta, T.,Das, C.,Urs, S.Raje Korean Society of Sericultural Science 2004 International Journal of Industrial Entomology Vol.9 No.2
Post-infectional biochemical changes due to Xanthomonas campestris pv. mori (Xcm) infection in five elite mulberry varieties viz., $S_1$, $S_{1635}$, $V_1$, RF $S_{175}$ and JRH was studied under inoculated condition. It was revealed that total soluble sugar and protein content was significantly declined in all the varieties due to X. campestris infection. Total phenol content was at par prior to inoculation in all varieties, but it was significantly increased in $S_1$, RF $S_{175}$, $S_{1635}$ and JRH 7 days after inoculation. The correlation coefficient (r) between total soluble sugar and total phenol content was found positive (r = 0.825) and statistically significant. Similarly, correlation coefficient (r) between total soluble protein and phenol content was found positive (r = 0.897) and statistically significant. The present study indicates that X. campestris infected leaves are nutritionally inferior in quality and the duration of phenol production in a mulberry variety play decisive role on disease resistance.nce.
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Arp 202: a TDG formed in a parent's extended dark matter halo?
Scott, T C,Lagos, P,Ramya, S,Sengupta, C,Paudel, S,Sahu, D K,Misra, K,Woo, J -H,Sohn, B W Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.475 No.1
<P>We report on H alpha+ [N II] imaging of the Arp 202 interacting pair and its tidal dwarf galaxy (TDG) candidate as well as a GMOS long slit spectrum from the TDG candidate, observed with the Gemini North telescope. Our H alpha + [N II] imaging reveals the TDG to have an elongated structure, similar to 1.9 kpc in length with the two principal star-forming knots at either end. Our observations also show the TDG candidate has a recessional V-H alpha similar to 3032km s(-1), within 100 km s(-1) of the parent pair's mean velocity and an oxygen abundance of 12+log(O/H) = 8.10 +/- 0.41. The TDG's oxygen abundance is in good agreement with that of a star-forming region in NGC 2719A, one of the parent galaxies, which has an estimated oxygen abundance of 12+log(O/H) = 8.05 +/- 0.41. The TDG's V-H alpha and oxygen abundance confirm previous results validating the candidate as a TDG. The absence of detectable emission from the TDG in Spitzer 3.6 and 4.5 vim images together with the lack of absorption lines and weak continuum in the spectrum is consistent with absence the of an old population (greater than or similar to 0.5 Gyr). The location of the TDG within the interaction debris and the absence of indicators of an old stellar population in the TDG is consistent with a scenario in which the TDG is formed from H I stripped from the parent galaxies and within the extended dark matter halo of one of the parents as proposed by Bournaud et al. and Duc et al.</P>
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Arp 65 interaction debris: massive H I displacement and star formation
Sengupta, C.,Scott, T. C.,Paudel, S.,Saikia, D. J.,Dwarakanath, K. S.,Sohn, B. W. EDP Sciences 2015 Astronomy and astrophysics Vol.584 No.-
<P>Context. Pre?merger tidal interactions between pairs of galaxies are known to induce significant changes in the morphologies and kinematics of the stellar and interstellar medium components. Large amounts of gas and stars are often found to be disturbed or displaced as tidal debris. This debris then evolves, sometimes forming stars and occasionally forming tidal dwarf galaxies. Here we present results from our HI study of Arp 65, an interacting pair hosting extended HI tidal debris. Aims. In an effort to understand the evolution of tidal debris produced by interacting pairs of galaxies, including in situ star and tidal dwarf galaxy formation, we are mapping HI in a sample of interacting galaxy pairs. The Arp 65 pair is the latest member of this sample to be mapped. Methods. Our resolved HI 21 cm line survey is being carried out using the Giant Metrewave Radio Telescope. We used our HI survey data as well as available SDSS optical, Spitzer infra-red and GALEX UV data to study the evolution of the tidal debris and the correlation of HI with the star-forming regions within it. Results. In Arp 65 we see a high impact pre?merger tidal interaction involving a pair of massive galaxies (NGC90 and NGC93) that have a stellar mass ratio of ~1:3. The interaction, which probably occurred ~1.0–2.5 × 10<SUP>8</SUP> yr ago, appears to have displaced a large fraction of the HI in NGC90 (including the highest column density HI) beyond its optical disk. We also find extended on-going star formation in the outer disk of NGC90. In the major star-forming regions, we find the HI column densities to be ~4.7 × 10<SUP>20</SUP> cm<SUP>−2</SUP> or lower. But no signature of star formation was found in the highest column density HI debris SE of NGC90. This indicates conditions within the highest density HI debris remain hostile to star formation and it reaffirms that high HI column densities may be a necessary but not sufficient criterion for star formation.</P>
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Sengupta, S.,Lee, W.S. Academic Press 2014 BIOSYSTEMS ENGINEERING Vol.117 No.-
Yield mapping for tree crops by mechanical harvesting requires automatic detection and counting of fruits in tree canopy. However, partial occlusion, shape irregularity, varying illumination, multiple sizes and similarity with the background make fruit identification a very difficult task to achieve. Therefore, immature green citrus-fruit detection within a green canopy is a challenging task due to all the above-mentioned problems. A novel algorithmic technique was used to detect immature green citrus fruit in tree canopy under natural outdoor conditions. Shape analysis and texture classification were two integral parts of the algorithm. Shape analysis was conducted to detect as many fruits as possible. Texture classification by a support vector machine (SVM), Canny edge detection combined with a graph-based connected component algorithm and Hough line detection, were used to remove false positives. Next, keypoints were detected using a scale invariant feature transform (SIFT) algorithm and to further remove false positives. A majority voting scheme was implemented to make the algorithm more robust. The algorithm was able to accurately detect and count 80.4% of citrus fruit in a validation set of images acquired from a citrus grove under natural outdoor conditions. The algorithm could be further improved to provide growers early yield estimation so that growers can manage grove more efficiently on a site-specific basis to increase yield and profit.
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SAMPLING BASED UNCERTAINTY ANALYSIS OF 10 % HOT LEG BREAK LOCA IN LARGE SCALE TEST FACILITY
Sengupta, Samiran,Dubey, S.K.,Rao, R.S.,Gupta, S.K.,Raina, V.K Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.6
Sampling based uncertainty analysis was carried out to quantify uncertainty in predictions of best estimate code RELAP5/MOD3.2 for a thermal hydraulic test (10% hot leg break LOCA) performed in the Large Scale Test Facility (LSTF) as a part of an IAEA coordinated research project. The nodalisation of the test facility was qualified for both steady state and transient level by systematically applying the procedures led by uncertainty methodology based on accuracy extrapolation (UMAE); uncertainty analysis was carried out using the Latin hypercube sampling (LHS) method to evaluate uncertainty for ten input parameters. Sixteen output parameters were selected for uncertainty evaluation and uncertainty band between $5^{th}$ and $95^{th}$ percentile of the output parameters were evaluated. It was observed that the uncertainty band for the primary pressure during two phase blowdown is larger than that of the remaining period. Similarly, a larger uncertainty band is observed relating to accumulator injection flow during reflood phase. Importance analysis was also carried out and standard rank regression coefficients were computed to quantify the effect of each individual input parameter on output parameters. It was observed that the break discharge coefficient is the most important uncertain parameter relating to the prediction of all the primary side parameters and that the steam generator (SG) relief pressure setting is the most important parameter in predicting the SG secondary pressure.
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Highly stereoselective synthesis of mupirocin H
Sengupta, S.,Kim, H.J.,Cho, K.S.,Song, W.Y.,Sim, T. Pergamon Press 2017 Tetrahedron Vol.73 No.8
A highly diastereoselective and efficient convergent synthesis of mupirocin H starting from (+)-®-Roche ester was achieved. Grubbs cross metathesis was employed as the key step in the pathway to generate an important E-olefin intermediate. Other processes utilized in the route include a Pd-catalysed stereoselective substitution reaction of a cis epoxide, Sharpless epoxidation followed by Red-Al promoted epoxide ring opening, and Seebach methylation and a TEMPO/BAIB mediated oxidation-lactonization sequence. Finally, we observed that mupirocin H inhibits SbnE, a synthetase required for staphyloferrin B biosynthesis.
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SAMPLING BASED UNCERTAINTY ANALYSIS OF 10 % HOTLEG BREAK LOCA IN LARGE SCALE TEST FACILITY
SAMIRAN SENGUPTA,S. K. DUBEY,R. S. RAO,S. K. GUPTA,V. K RAINA 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.6
Sampling based uncertainty analysis was carried out to quantify uncertainty in predictions of best estimate codeRELAP5/MOD3.2 for a thermal hydraulic test (10% hot leg break LOCA) performed in the Large Scale Test Facility (LSTF)as a part of an IAEA coordinated research project. The nodalisation of the test facility was qualified for both steady state andtransient level by systematically applying the procedures led by uncertainty methodology based on accuracy extrapolation(UMAE); uncertainty analysis was carried out using the Latin hypercube sampling (LHS) method to evaluate uncertainty forten input parameters. Sixteen output parameters were selected for uncertainty evaluation and uncertainty band between 5thand 95thpercentile of the output parameters were evaluated. It was observed that the uncertainty band for the primary pressure duringtwo phase blowdown is larger than that of the remaining period. Similarly, a larger uncertainty band is observed relating toaccumulator injection flow during reflood phase. Importance analysis was also carried out and standard rank regression coefficientswere computed to quantify the effect of each individual input parameter on output parameters. It was observed that the breakdischarge coefficient is the most important uncertain parameter relating to the prediction of all the primary side parametersand that the steam generator (SG) relief pressure setting is the most important parameter in predicting the SG secondary pressure.
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