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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - The Difference of Rrs Product Derived From Modis Meris and Seawifs in South China Sea
摘要： This study presents the difference of normalized remote sensing reflectance (Rrs) between SeaWiFS, MERIS and MODIS with in situ data in the SCS. The results show that all the satellite-derived Rrs are less than the in situ data, and the APD(Absolute Percentage Difference) of the Rrs from the three satellite sensors are mostly less than 20%, except band 412 and 660 nm in global ocean and band 555and 660nm in SCS. The blue band of the three missions have the good performances, whose APD are less than 15%. The performances of MODIS Rrs is better than MERIS (or SeaWiFS). And, compared with each other in the SCS , the results show that the Rrs of the three missions are generally agree well with each other, but they still have big differences in the coastal area. The MODIS Rrs is bigger than MERIS’s and SeaWiFS’s in the 412, 443 and 488 nm band. The differences between MERIS (or SeaWiFS) and MODIS change with band (488 nm is the best one). And the differences among three missions for blue band has seasonal variation in the SCS from 2008 to 2010.
关键词： Validation,SCS,cross validation,MODIS/MERIS/SeaWiFS,Rrs
更新于2025-09-23 15:21:21
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Excited-state proton transfer in protonated adrenaline revealed by cryogenic UV photodissociation spectroscopy
摘要： We report a comprehensive study of the structures and deactivation processes of protonated adrenaline through cryogenic UV photodissociation spectroscopy. Single UV and double-resonance UV-UV hole burning spectroscopies have been performed and compared to coupled-cluster SCS-CC2 calculations done on the ground and first electronic states. Three conformers were assigned, the two lowest energy gauche conformers along with a higher energy conformer with an extended structure which is indeed the global minimum in solution. This demonstrates the kinetic trapping of this high energy gas phase conformer during the electrospray process. At the band origin of all conformers, the main fragmentation channel is the Cα-Cβ bond cleavage, triggered by an excited state proton transfer to the catechol ring. Internal conversion leading to the water loss channel competes with the direct dissociation and tends to prevail with the increase of excess energy brought by the UV laser. Picosecond time-resolved pump-probe spectroscopy was achieved to measure the excited state lifetimes of the three conformers of AdH+, which decay with the increase of excess in the ππ* state from 2 ns at the band origin down to few hundreds of picosecond 0.5 eV to the blue. Finally, about 0.8 eV above the band origin, the πσ* state is directly reached leading to the opening of the H-loss channel.
关键词： excited-state proton transfer,SCS-CC2 calculations,cryogenic UV photodissociation spectroscopy,protonated adrenaline,conformer assignment
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC) - Chengdu, China (2019.12.20-2019.12.22)] 2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC) - Research on Sparse Code Shrinkage denoise in Underwater 3D Laser Scanning Images
摘要： Noise removal is the pre-stage and essential step for many image processing tasks. Sometimes it is hard to have correct exposure for camera in underwater environment. In general, we need to have long exposure time to collect the weak light signal which increase the background electrical noise and higher than the signal. Underwater laser scanning is such special case with white laser stripe and dark background images. Hence, noise including which dots, lumps have heavy impact to our laser image. This paper discuss underwater laser scanning image denoise and presents the method based on Sparse code shrinkage algorithm to reduce such noise effect in ?nal reconstructed 3D model. The comparative study using natural and real 3D underwater scanning images is presented on the experimental section.
关键词： SCS,3D laser scanning,Image denoise,Underwater Images
更新于2025-09-19 17:13:59
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Comparative study of photoluminescence of single and mixed phase ZrTiO4 prepared by solution combustion and polymeric precursor method
摘要： This work aims to study synthesis methods and photoluminescence properties of ZrTiO4. Wet chemical routes used for synthesis are solution combustion method and polymeric precursor method. Urea and glycine are two different fuels used in solution combustion synthesis. Scanning Electron Microscope studies con?rms that morphology of the nanoparticles depends on synthesis method. Photoluminescent property depends on the phase of the material, rather than the method of synthesis. Characterization such as X-ray diffraction, SEM, Re?ectance and Photoluminescence studies prove the role of synthesis methods on the properties of the ZrTiO4. Both upconversion and down conversion luminescence have been achieved by synthesizing ZrTiO4 from solution combustion method using urea as fuel, where ZrTiO4 exists in mixed phase.
关键词： Polymeric precursor method, (PPM),Photoluminescence,Single phase,Mixed phase,ZrTiO4,Solution combustion method, (SCS)
更新于2025-09-09 09:28:46