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Digitale Medien

A comparison of sedimentary and diatom-inferred phosphorus profiles: implications for defining pre-disturbance nutrient conditions (1993)

Anderson, N. J. ; Rippey, B. ; Gibson, C. E.

Springer

Hydrobiologia 253 (1993), S. 357-366

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ISSN: 1573-5117

Schlagwort(e): weighted averaging ; calibration ; phosphorus ; diatoms ; palaeolimnology ; Northern Ireland

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Interpreting sedimentary phosphorus profiles in terms of changes in the historical P load is difficult due to variable retention and post-depositional diagenesis. An alternative approach is to use diatom assemblages in surface sediments and derive a transfer function for epilimnetic SRP and total P concentrations using weighted average regression and calibration. The obtained relationship can then be applied to down-core changes in sedimentary diatom assemblages and diatom-inferred P (DI-P) used to assess historical changes in epilimnetic P-concentrations. A diatom-phosphorus calibration data set for 43 eutrophic lakes in Northern Ireland has been constructed and applied to two small eutrophic lakes (Lough Mann, White Lough). DI-total P (i.e. predicted) is highly correlated with observed TP (r 2 = 0.75) for the surface-sediment training data-set. The resultant changes in DI-P derived from application of the transfer function to down-core changes in diatom assemblages are compared to sedimentary P concentrations. The latter are highly variable, presumably due to redox-derived effects, while DI-P profiles are more readily interpretable, and agree with other stratigraphic records of lake eutrophication. The method offers a good possibility of defining pre-disturbance (i.e. natural) phosphorus concentrations in lakes with associated implications for lake-restoration programmes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00050761

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Digitale Medien

First-order invariants of Euclidean motions (1991)

Donelan, P. S. ; Gibson, C. G.

Springer

Acta applicandae mathematicae 24 (1991), S. 233-251

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ISSN: 1572-9036

Schlagwort(e): 70B10 ; Kinematics ; invariants ; screws

Quelle: Springer Online Journal Archives 1860-2000

Thema: Mathematik

Notizen: Abstract Let E(n) be the lie group of proper rigid motions of Euclidean n-space. The paper is concerned with the adjoint action of E(n) on its Lie algebra e(n), and the induced action on the Grassmannian of subspaces of e(n) of a given dimension. For the adjoint action, the authors list explicit generators for the ring of invariant polynomials. In the case n=3, of greatest physical interest, explicit finite invariant stratifications are given for the Grassmannians, providing a formal listing of the screw-systems familiar in theoretical kinematics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00047045

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