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  • 1
    Electronic Resource
    Electronic Resource
    Effects of temperature and body size on radiocaesium retention in brown trout, Salmo trutta (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 28 (1992), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The elimination rate of radiocaesium in brown trout Salmo trutta L. was determined in the laboratory at four water temperatures (range 4.4–15.6°C). In the experiments three or four homogenous size-groups of fish (mean weights 23–496 g) were studied at each temperature.2. The brown trout received acute oral doses of 134Cs and were killed at intervals for radioactivity counting. The retention versus time curves were composed of two distinct exponential components. The long-lived component was quantitatively the most important for retention of radiocaesium. Elimination rate increased with increasing water temperature and decreased with increasing body weight.3. The biological half-life of 134Cs (Tb, days) was related to fresh body weight (W, g) and water temperature (t, °C) by the equation: Tb= 290 ×W°.176× e-°.106×t. The elimination rate of Cs could be predicted from weight-specific metabolic rate as given by Elliott's equations for brown trout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1992.tb00573.x
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  • 2
    Electronic Resource
    Electronic Resource
    Some results about numerical quadrature on the unit circle (1996)
    Springer
    Advances in computational mathematics 5 (1996), S. 297-328 
    Details
    ISSN: 1572-9044
    Keywords: Distribution functions ; integration rules ; interpolation nodes ; Szegö polynomials ; 41 ; 65D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, quadrature formulas on the unit circle are considered. Algebraic properties are given and results concerning error and convergence established. Finally, numerical experiments are carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02124749
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  • 3
    Electronic Resource
    Electronic Resource
    Orthogonal rational functions and modified approximants (1996)
    Springer
    Numerical algorithms 11 (1996), S. 57-69 
    Details
    ISSN: 1572-9265
    Keywords: Positive-definite ; Hermitian inner product ; orthogonal rational functions ; associated functions ; moment problem ; primary 30E05
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract Let {α n | n ∞ be a sequence in the open unit disk in the complex plane and let $$(\overline {\alpha _k } |\alpha _k | = - 1$$ when α k =0. Let μ be a positive Borel measure on the unit circle, and let {φ n } n ∞ be the orthonormal sequence obtained by orthonormalization of the sequence {B n } n ∞ with respect to μ. Let {ψ n } n ∞ be the sequence of associated rational functions. Using the functions φ n , ψ n and certain conjugates of them, we obtain modified Padé-type approximants to the function $$F\mu (z) = \int\limits_{ - \pi }^\pi {\frac{{t + z}}{{t - z}}} d\mu (\theta ), (t = e^{i\theta } ).$$
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02142488
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  • 4
    Electronic Resource
    Electronic Resource
    On the convergence of multipoint Padé-type approximants and quadrature formulas associated with the unit circle (1996)
    Springer
    Numerical algorithms 13 (1996), S. 321-344 
    Details
    ISSN: 1572-9265
    Keywords: multipoint Padé-type approximation ; orthogonal rational functions ; quadrature formula ; 41A21 ; 30E05 ; 41A55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We study the convergence of rational interpolants with prescribed poles on the unit circle to the Herglotz-Riesz transform of a complex measure supported on [−π, π]. As a consequence, quadrature formulas arise which integrate exactly certain rational functions. Estimates of the rate of convergence of these quadrature formulas are also included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207699
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  • 5
    Electronic Resource
    Electronic Resource
    Ombrotrophic peat bogs as monitors of trends in atmospheric deposition of pollutants: Role of neutron activation analysis in studies of peat samples (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 192 (1995), S. 205-213 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Ombrotrophic peat bogs, which are quite common in temperate regions, receive chemical compounds only from the atmosphere. These bogs are therefore well suited to study temporal and spatial trends of air pollutants such as heavy metals, provided that the substances concerned are sufficiently strongly retained in the peat. In this paper, the use of instrumental and radiochemical neutron activation analysis to study trace elements in ombrotrophic peat is described. This work has provided very useful information with respect to the impact of long range atmospheric transport of pollutants to different parts of Norway, and has also been shown to be a useful tool in the study of natural trace element cycling processes. Elements discussed in particular are Zn, Se, Sb, and Br.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041724
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  • 6
    Electronic Resource
    Electronic Resource
    Variations in atmospheric trace element deposition studied by INAA of peat cores from ombrotrophic bogs (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 114 (1987), S. 69-74 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In the present work INAA is used to determine as many elements as possible in peat samples from ombrotrophic bogs. Results for depth distribution profiles of some elements of particular interest are presented for selected bogs from areas with highly different input from long-range atmospheric transport of pollutants. In addition to information on air pollution, the data provide knowledge about contribution from natural processes to the airborne supply of some elements, such as in the case of selenium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02048876
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    Paper (German National Licenses)
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