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  • 1
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    The role of electron-electron interactions in two-dimensional Dirac fermions (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-08-10
    Description: The role of electron-electron interactions in two-dimensional Dirac fermion systems remains enigmatic. Using a combination of nonperturbative numerical and analytical techniques that incorporate both the contact and long-range parts of the Coulomb interaction, we identify the two previously discussed regimes: a Gross-Neveu transition to a strongly correlated Mott insulator and a semimetallic state with a logarithmically diverging Fermi velocity accurately described by the random phase approximation. We predict that experimental realizations of Dirac fermions span this crossover and that this determines whether the Fermi velocity is increased or decreased by interactions. We explain several long-standing mysteries, including why the observed Fermi velocity in graphene is consistently about 20% larger than values obtained from ab initio calculations and why graphene on different substrates shows different behaviors.
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 2
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    Hypothesis on the origin of lineaments in the LANDSAT and SLAR images of precambrian soil in the low Contas River Valley (southern Bahia) (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Examination of LANDSAT and SLAR images in southern Bahia reveals numerous linear features, which are grouped in five sets, based on their trends: N65 degrees E, N70 degrees W, N45 degrees E and NS/N15 degrees E. Owing to their topographic expressions, distributive patterns, spacing between individual lineaments and their mutual relationships, the lineament sets of N65 degrees E and N70 degrees W, as well as the sets of N40 degrees E and N45 degrees W, are considered as two groups of conjugate shear fractures and the former is older and is always cut by the latter. Their conjugate shear angles are 45 degrees and 85 degrees and their bisector lines are approximately in east-west and north-south directions, respectively. According to Badgeley's argumentation on the conjugate shear angles, the former conjugate shear fractures would be caused by: (1) vertical movements, and the bisector of their conjugate angle would be parallel to the long axis of horsting or folding, or (2) by a compressive force in the east-west direction and under a condition of low confining pressure and temperature.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E85-10007 , NASA-CR-168559 , NAS 1.26:168559 , INPE-3287-RPE/467
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Surveying the area of deforestation of the Amazon by LANDSAT satellite imagery (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: LANDSAT imagery was used to determine the amount of deforestation in a study area comprising 55 million hectares of the Amazon region. Results show that more than 4 million hectares were deforested. Maps and pictures of the deforested area in relation to the total area of the Amazon are included.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10049 , NASA-CR-163759 , INPE-1411-NTE/142
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Application of remote sensing to the photogeologic mapping of the region of the Itatiaia alkaline complex (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Remote sensing methods applied to geologically complex areas, through interaction of ground truth and information obtained from multispectral LANDSAT images and radar mosaics were evaluated. The test area covers parts of Minos Gerais, Rio De Janeiro and Sao Paulo states and contains the alkaline complex of Itatiaia and surrounding Precambrian terrains. Geological and structural mapping was satisfactory; however, lithological varieties which form the massif's could not be identified. Photogeological lineaments were mapped, some of which represent the boundaries of stratigraphic units. Automatic processing was used to classify sedimentary areas, which includes the talus deposits of the alkaline massifs.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10178 , NASA-CR-168601 , NAS 1.26:168601 , INPE-2220-TDL/062
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Application of remote sensing to the geological study of the alkaline complex region of Itatiaia (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The methodology of remote sensing applied to geological study in a complex area was evaluated. Itatiaia was selected as a test area, which covers the alkaline massives and its precambrian basement. LANDSAT-MSS and radar mosaic of the RADAMBRASIL Project were used for photointerpretation. Previous geological works were consulted and many discrepancies in the distribution of stratigraphic units were found. Moreover, structural lineaments and talus deposits were clearly delineated.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10048 , NASA-CR-163758 , Reuniao Anual da Soc. Brasil. para o Progr. da Ciencia (SBPC); Jul 06, 1980 - Jul 12, 1980; Rio de Janeiro; Brazil
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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