http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Relative Microalgal Concentration in Prydz Bay, East Antarctica during Late Austral Summer, 2006
Rahul Mohan,Sunil Kumar Shukla,N. Anilkumar,M. Sudhakar,Satya Prakash,R. Ramesh 한국조류학회I 2009 ALGAE Vol.24 No.3
Microalgae using a submersible fluorescence probe in water column (up to 100 m) were measured during the austral summer of 2006 (February) in Prydz Bay, East Antarctica (triangular-shaped embayment in the Indian sector of Southern Ocean). Concurrently, environmental parameters such as temperature, salinity and nitrogen (nitrate, ammonium, urea) uptake rates were measured. The concentration of phytoplankton is relatively high due to availability of high nutrients and low sea surface temperature. Phytoplankton community is dominated by diatoms whereas cryptophytes are in low concentration. The maximum concentration of total chlorophyll is 14.87 μg L-1 and is attributed to upwelled subsurface winter water due to local wind forcing, availability of micro-nutrients and increased attenuation of photosynthetically available radiation (PAR). Concentration of blue-green algae is low compared to that of green algae because of low temperature. Comparatively high concentration of yellow substances is due to the influence of Antarctic melt-water whereas cryptophytes are low due to high salinity and mixed water column. Varied concentrations of phytoplankton at different times of Fluoroprobe measurements suggest that the coastal waters of Prydz Bay are influenced by changing sub-surface water temperature and salinity due to subsurface upwelling induced by local winds as also melting/freezing processes in late summer. The productivity is high in coastal water due to the input of macro as well as micro-nutrients.
Relative Microalgal Concentration in Prydz Bay, East Antarctica during Late Austral Summer, 2006
Mohan, Rahul,Shukla, Sunil Kumar,Anilkumar, N.,Sudhakar, M.,Prakash, Satya,Ramesh, R. The Korean Society of Phycology 2009 ALGAE Vol.24 No.3
Microalgae using a submersible fluorescence probe in water column (up to 100 m) were measured during the austral summer of 2006 (February) in Prydz Bay, East Antarctica (triangular-shaped embayment in the Indian sector of Southern Ocean). Concurrently, environmental parameters such as temperature, salinity and nitrogen (nitrate, ammonium, urea) uptake rates were measured. The concentration of phytoplankton is relatively high due to availability of high nutrients and low sea surface temperature. Phytoplankton community is dominated by diatoms whereas cryptophytes are in low concentration. The maximum concentration of total chlorophyll is 14.87 ${\mu}g\;L^{-1}$ and is attributed to upwelled subsurface winter water due to local wind forcing, availability of micro-nutrients and increased attenuation of photosynthetically available radiation (PAR). Concentration of blue-green algae is low compared to that of green algae because of low temperature. Comparatively high concentration of yellow substances is due to the influence of Antarctic melt-water whereas cryptophytes are low due to high salinity and mixed water column. Varied concentrations of phytoplankton at different times of Fluoroprobe measurements suggest that the coastal waters of Prydz Bay are influenced by changing sub-surface water temperature and salinity due to subsurface upwelling induced by local winds as also melting/freezing processes in late summer. The productivity is high in coastal water due to the input of macro as well as micro-nutrients.
Suhas S. Shetye,Rahul Mohan,Abhilash Nair 한국지질과학협의회 2014 Geosciences Journal Vol.18 No.2
We used silicoflagellate assemblage records to describethe polar frontal variability over the last 48kyr in the Indian sectorof the Southern Ocean. The studied core was collected onboardORV Sagar Nidhi from within the Polar frontal zone (PFZ) duringthe 4th Indian Scientific Expedition to Southern Ocean. The Polar frontis dominated by silica-rich sediments (diatoms and silicoflagellates). Silicoflagellates were dominated by Distephanus speculum andDictyocha fibula species. The biostratigraphic record of these silicoflagellateswas used qualitatively to examine past changes inpolar frontal variability in the Southern Ocean. Warming is indicatedby an increase (decrease) in Dictyocha sp. (Distephanus sp.) from theLGM to the Holocene. Dictyocha sp. abundance indicates warmertemperatures during 43–45 kyr and is nearly synchronous withthe warming event recorded in an Antarctic ice core. Dictyocha/Distephanus ratio also suggests a northern and southern shift inthe polar front during LGM and 43–45 kyr respectively. The southwarddisplacement of the frontal system is linked to an increase insea surface temperature as evidenced from the δ18O Byrd Antarcticice core data and solar insolation data. The low dust flux, higherδ18O and absence of an upwelling indicator diatom, Thallasionemanitzchoides during the Antarctic warming event also suggest strongerthermal stratification during the Antarctic warming event ascompared to LGM. The present study would improve our understandingof the frontal variability under future warming scenarios.
Quality Analysis of Stored Bell Peppers Using Near-Infrared Hyperspectral Imaging
Rahman, Anisur,Faqeerzada, Mohammad Akbar,Joshi, Rahul,Lohumi, Santosh,Kandpal, Lalit Mohan,Lee, Hoonsoo,Mo, Changyeun,Kim, Moon Sung,Cho, Byoung-Kwan American Society of Agricultural and Biological En 2018 Transactions of the ASABE Vol.61 No.4
<P>Abstract. The objective of this study was to predict the moisture content (MC), soluble solids content (SSC), and titratable acidity (TA) content in bell peppers during storage (18°C, 85% relative humidity) over 12 days, based on near-infrared hyperspectral imaging (NIR-HSI) in the 1000-1500 nm wavelength range. The mean spectra of 148 mature bell peppers were extracted from the hyperspectral images, and multivariate calibration models were built using partial least squares (PLS) regression with different preprocessing spectra techniques. The most effective wavelengths were selected using the variable importance in projection (VIP) technique, which selected optimal variables for the target quality parameters of bell peppers from a full set of variables. Subsequently the selected variables were used to develop a PLS-VIP model for simplifying the prediction model. The MC, SSC, and TA content in bell peppers during storage changed from 90.7% to 93.0%, from 6.1%Brix to 7.3%Brix, and from 0.222% to 0.334%, respectively. The PLS regression model with MC, SSC, and TA content resulted in coefficients of determination (R<SUP>2</SUP>pred) of 0.83, 0.85, and 0.7, with standard errors of prediction (SEP) of 0.08%, 0.075%Brix, and 0.013%, respectively, using SNV preprocessed spectra for MC and TA content and Savitzky-Golay (S-G) second-order derivatives preprocessed spectra for SSC of bell peppers. By contrast, the prediction results yielded R<SUP>2</SUP>pred of 0.69, 0.75, and 0.68, respectively, with SEP values of 0.103%, 0.107%Brix, and 0.011% when the PLS-VIP model was employed. The PLS-VIP model simplified the calibration model by selecting the most important variables in terms of their responsiveness to bell pepper quality properties. The results revealed that HSI coupled with multivariate analysis can be used successfully to predict the MC, SSC, and TA content in bell peppers. Keywords: Fruit quality, Hyperspectral imagery, Image analysis, Spectral analysis, Stored bell pepper.</P>