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  • SOLID-STATE PHYSICS  (2)
  • boreal forest  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Water, air & soil pollution 82 (1995), S. 3-11 
    ISSN: 1573-2932
    Keywords: boreal forest ; Russia ; Scandinavia ; co-operation ; sustainable use ; forest history ; research, education, management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The boreal forest is in transition. Large areas in remote regions are still in a pristine state, but extensive exploitation or intensive management for wood production dominates in Russia, Canada and the Nordic countries. The broadened view that forests are sources of other products than wood as well as of biodiversity is gradually becoming internationally accepted. To sustain the boreal forest for the future it must be realised that the forest has to be sustained as a system rather than as a number of utilities that can be considered separately. In northern Europe the situation is particularly striking with a strong contrast between the adjacent boreal forests in Scotland, Sweden and Finland on the one hand, and the north-west of Russia on the other. The two regions differ by history, type of land use and economic system but they are basically biologically similar. Combining sustainable wood production and maintenance of biodiversity and other values means setting limits to the intensity and extent of forest management. If the impact has been large, it is also necessary to build more natural features into managed systems. Developing a sustained boreal forest system by management of forests and forests reserves can be more efficient if research, education and management are well integrated. Scientists, teachers and managers must meet frequently and interact. In this way the time-lag between the advent of new knowledge and its implementation in the field can be reduced. We argue that co-operation among contrasting regions like the east and the west provides a unique opportunity for such integration. We review the problems and requirements in the west and the east, respectively, by contrasting Scotland, Sweden and the Komi Republic in Russia. The experiences are different and therefore complementary to each other. This assures long-term benefits of joint action.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2013-08-31
    Description: Considering the phase equilibrium diagram of the system Bi203-SrO-CaO-CuO, single phase 'Bi2Sr2CaCu208' ceramics have been transformed by a simple annealing procedure into multiphase samples. The transformation results in the formation of second phases and in an increase of the intra-grain critical current density at 1 T of five times. This increase is believed to express improved pinning properties of the superconducting crystals. The prepared pinning centers are believed to be e.g. coherent precipitates (Guinier-Preston-zones) within the superconducting crystals.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA. Johnson Space Center, Proceedings of the 4th International Conference and Exhibition: World Congress on Superconductivity, Volume 2; p 677-68
    Format: application/pdf
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  • 3
    Publication Date: 2013-08-31
    Description: The oxygen content of Bi(2+x)Sr(3-y)Cu2O(8+d) (2212 phase) has been determined as a function of its cation concentration. With increasing Ca and Bi content the oxygen content increases and T(sub c) decreases. The oxygen content of Ca rich 2212 phase increases with decreasing annealing temperatures. The study shows that the T(sub c) of the 2212 phase primarily is controlled by its cation concentration.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA. Johnson Space Center, Proceedings of the 4th International Conference and Exhibition: World Congress on Superconductivity, Volume 2; p 483-48
    Format: application/pdf
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