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  • 1995-1999  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Pyroelectric and dielectric properties of some heavy rare-earth orthochromites (1996)
    Springer
    Journal of materials science 7 (1996), S. 35-38 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The measurement of pyroelectric coefficient (p) and dielectric constant (K) of rare-earth orthochromites RCrO3, where R = Tb, Dy, Ho, Er and Yb are reported for the temperature range 300–600 K. Pyroelectric data show that all the studied orthochromites have ferroelectric phase in this temperature range. The dielectric data in some cases support this conclusion. Spontaneous polarization (P s) and Curie temperature (T c) have also been evaluated. The maximum value of P s varies from 0.041 Cm−2 to 0.30 Cm−2 in the studied orthochromites, which is very small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194090
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A conceptual model for the assessment of depressional wetlands in the prairie pothole region (1995)
    Springer
    Wetlands ecology and management 3 (1995), S. 195-208 
    Details
    ISSN: 1572-9834
    Keywords: Wetlands ; conceptual model ; indicators ; prairie pothole region ; EMAP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The U.S. Environmental Protection Agency's (EPA's), Environmental Monitoring and Assessment Program (EMAP) is developing a landscape-level conceptual model to evaluate the condition of depressional (basin-type) wetlands in the prairie pothole region (PPR) of the United States. This effort is underway to determine the current condition of the Nation's wetlands and to track how it is improving or degrading over time, as well as to identify management priorities over major geographic areas. The depressional wetlands in the PPR were selected by EMAP both because of the importance of this region for waterfowl and because of the efforts currently being conducted by federal agencies and academic institutions in this region. The PPR provides nesting habitat for more than 15 species of ducks, and supports as much as half of the total production of dabbling and diving ducks in North America. Wetlands in this area became a vulnerable resource after extensive draineage in the 1800s. We propose a conceptual model that represents a framework for guiding the development of ecological indicators, research activities, and data collection for the evaluation of wetland conditions. In princple, this conceptual model is applicable to wetlands in any part of the world.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00179836
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    Paper (German National Licenses)
    Fulltext
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