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  • 2005-2009
  • 1990-1994  (2)
  • 1970-1974
  • 1992  (2)
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  • 2005-2009
  • 1990-1994  (2)
  • 1970-1974
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Keywords
  • 1
    ISSN: 1432-0630
    Keywords: 78.65 ; 68.55 ; 81.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The optical and structural properties of films deposited from laser sintered Zirconia (ZrO2), Hafnia (HfO2), and Yttria (Y2O3) and from the commercially available (unprocessed material) Zirconia, Hafnia and Yttria, were studied and compared. All the films had low absorption. Films deposited from the laser sintered material had very low optical inhomogeneity. ZrO2 films showed negative inhomogeneity for films deposited from the unprocessed material. The refractive index increased for ZrO2 films deposited from the laser sintered material. HfO2 and Y2O3 films showed positive inhomogeneity when deposited from the unprocessed material. The refractive index of the films of these materials decreased when deposited from the laser sintered material. The thin films of ZrO2 and Y2O3 prepared from laser sintered material had stable monoclinic and cubic structures respectively while HfO2 films were found to be amorphous.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of atmospheric chemistry 14 (1992), S. 315-337 
    ISSN: 1573-0662
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Emissions of sulfur gases from both natural and anthropogenic sources strongly influence the chemistry of the atmosphere. To assess the relative importance of these sources we have combined the measurements of sulfur gases and fluxes during the past decade to create a global emission inventory. The inventory, which is divided into 12 latitude belts, takes into account the seasonal dependence of sulfur emissions from biogenic sources. The total emissions of sulfur gases from natural sources are approximately 0.79 Tmol S/a. These emissions are 16% of the total sulfur emissions in the Northern Hemisphere and 58% in the Southern Hemisphere. The inventory clearly shows the impact of anthropogenic sulfur emissions in the region between 35° and 50°N.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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