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  • 1
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    Bulk sensitive x-ray absorption spectroscopy free of self-absorption effects (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-03-01
    Description: Author(s): A. J. Achkar, T. Z. Regier, H. Wadati, Y.-J. Kim, H. Zhang, and D. G. Hawthorn We demonstrate a method of x-ray absorption spectroscopy (XAS) that is bulk sensitive, like traditional fluorescence yield measurements, but is not affected by self-absorption or saturation effects. This measure of XAS is achieved by scanning the incident photon energy through an absorption edge and... [Phys. Rev. B 83, 081106] Published Mon Feb 28, 2011
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Fermi surface reconstruction in CeTe_{2} induced by charge density waves investigated via angle resolved photoemission (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-02-11
    Description: Author(s): J.-S. Kang, D. H. Kim, H. J. Lee, Jihoon Hwang, Han-Koo Lee, H.-D. Kim, B. H. Min, K. E. Lee, Y. S. Kwon, J. W. Kim, Kyoo Kim, B. H. Kim, and B. I. Min Electronic structures of a charge-density wave (CDW) system CeTe 2− x Sb x ( x =0 , 0.05) have been investigated by employing angle-resolved photoemission spectroscopy (ARPES) and the first-principles electronic and phonon band-structure methods. The observed Fermi surface (FS) agrees very well with the ca... [Phys. Rev. B 85, 085104] Published Fri Feb 10, 2012
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Electronic structure of the metallic antiferromagnet PdCrO_{2} measured by angle-resolved photoemission spectroscopy (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-09-06
    Description: Author(s): J. A. Sobota, K. Kim, H. Takatsu, M. Hashimoto, S.-K. Mo, Z. Hussain, T. Oguchi, T. Shishidou, Y. Maeno, B. I. Min, and Z.-X. Shen PdCrO 2 is material which has attracted interest due to the coexistence of metallic conductivity associated with itinerant Pd 4 d electrons and antiferromagnetic order arising from localized Cr spins. A central issue is determining to what extent the magnetic order couples to the conduction electrons.... [Phys. Rev. B 88, 125109] Published Thu Sep 05, 2013
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Application of Fermi hypernetted-chain theory to spin-polarized higher-order fractional quantum Hall states (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-04-07
    Description: Author(s): J. W. Kim, H. Kim, and N. Kim We apply Fermi hypernetted-chain theory to study the spin polarization of higher-order fractional quantum Hall (FQH) states at filling factors in between the primary FQH sequences, ν = p / ( q e p ± 1 ) , where q e is an even integer and p is a nonzero integer. The filling factors related to the higher-order FQ… [Phys. Rev. B 95, 155109] Published Thu Apr 06, 2017
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Early evaluation of Thematic Mapper data for coastal process studies (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Two sets of TM data taken over the ocean off the coast of the Southeastern U.S. Bight were studied for the applicability of TM data to marine environments. First, the results of applying TM and TMS data to determine chlorophyll concentration in the ocean are presented. Chlorophyll quantification in the range of 0.5 to 2.0 mg/cu m was achieved by taking the ratio of TM band-1/band-2. Second, the results of applying TM band-6 data to monitor sea surface temperature are described. A comparison of TM data with AVHRR data shows TM readings coincide with AVHRR data within a scatter of 0.5 deg C in most of the areas studied. Lastly, the results of a technique to map the water depths of coral reefs in the Great Bahama Bank are demonstrated. Depths from 0 to 20 meters were delineated using TM band-1. The classification accuracy and origins of anomalous depth points are discussed.
    Keywords: OCEANOGRAPHY
    Type: Advances in Space Research (ISSN 0273-1177); 5; 5, 19
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  • 6
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    An evaluation of 685 nm fluorescence imagery of coastal waters (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: To evaluate the possible application of sunlight-illuminated fluorescence at 685 nm for remote sensing of phytoplankton concentrations, an ocean-color scanner is flown on an aircraft. The results of an analysis of the scanner data, obtained from a series of test flights conducted along the Elbe River and its estuary in the North Sea, show that 685 nm fluorescence is a promising remote-sensing method. The observation of a strong correlation between the fluorescence yields and the chlorophyll concentrations determined by the absorption method which uses the reflectance ratio of blue/green channels, is discussed. The two methods are compared and it is shown that the fluorescence method has an edge over the other due to the data-processing algorithm and its applicability for surveying bio-resources in all types of water. Photographs of the chlorophyll patterns are presented.
    Keywords: OCEANOGRAPHY
    Type: ESA Journal (ISSN 0379-2285); 9; 1, 19
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  • 7
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    Ocean chlorophyll studies from a U-2 aircraft platform (1980)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Chlorophyll gradient maps of large ocean areas were generated from U-2/OCS data obtained over test sites in the Pacific and the Atlantic Oceans. The delineation of oceanic features using the upward radiant intensity relies on an analysis method which presupposes that radiation backscattered from the atmosphere and the ocean surface can be properly modeled by using a measurement made at 778 nm. The calculation of atmospheric radiance was performed by using a method developed by Dave. An estimation of the chlorophyll concentration is performed by properly ratioing radiances measured at 472 and 548 nm after removing the atmospheric effects. The correlation between the remotely sensed data and the in situ surface chlorophyll measurements has been validated in two sets of data. The results show that the correlation between the in situ measured chlorophyll and the derived quantity is a negative exponential function, and the correlation coefficient was calculated to be -0.965.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research; 85; July 20
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  • 8
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    The ocean color experiment (OCE) on the second orbital flight test of the Space Shuttle (OSTA-1) (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The Ocean Color Experiment was one of the six remote-sensing experiments which for the first time were launched and successfully operated on board of the second flight of the Space Shuttle during November 1981. The experiment consists of a multispectral image scanner dedicated to the measurement of water color and its interpretation in terms of major water constituents and circulation patterns. The objectives of the experiment, the test site selection, and associated activities are described. The actual mission and results of an initial data analysis is discussed.
    Keywords: OCEANOGRAPHY
    Type: (ISSN 0196-2892)
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  • 9
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    Chlorophyll gradient map from high-altitude ocean-color-scanner data (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A chlorophyll density map of an ocean area 25 x 30 km is presented, and the procedure used in generating the map from high-altitude ocean-color-scanner data is discussed. Data were obtained from a ten-channel radiometer on board a U-2 aircraft flying at 19.8 km above the coastal waters of Monterey Bay, California under conditions of clear skies and clear and deep water; the processing algorithms should be useful for satellite data as well. The total radiance measured at high altitude was separated into an atmospheric and sea-surface component and a water component, which is associated with chlorophyll content, for each pixel using the upwelling radiance of a near IR channel to estimate the atmospheric effect. Chlorophyll data were extracted by taking the ratio of the difference of intensities in the 472 and 506 nm channels to the sum of the channels, and are found to agree with shipboard chlorophyll determinations at a depth of 5 m.
    Keywords: OCEANOGRAPHY
    Type: Applied Optics; 18; Nov. 15
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  • 10
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    Initial analysis of OSTA-1 ocean color experiment imagery (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: NASA's Ocean Color Experiment (OCE) was designed to map ocean features with an eight-channel scanning radiometer installed on the second flight of the Space Shuttle Columbia. Digital computer enhancement and band-ratio techniques were applied to radiometrically corrected spectral data in order to emphasize chlorophyll distribution patterns. Such a pattern was evident in the Yellow Sea between Korea and China, and the effects of discharge from the Yangtze and other rivers were also observed. Two scenes, from orbits 30 and 32, revealed the movement of plankton patches in the Gulf of Cadiz. Geometric correction of the images permitted ocean current velocities to be deduced, and water depth variability over the Grand Bahama Bank was estimated by means of OCE's blue-green channel. Bottom-reflected sunlight produced a sensor signal that was inversely related to water depth.
    Keywords: OCEANOGRAPHY
    Type: Science; 218; Dec. 3
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