ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 32 (1984), S. 139-152 
    ISSN: 1436-5057
    Keywords: 65F15 ; 65N25 ; 65L15 ; Preconditioning ; generalized eigenvalue problem ; conjugate gradient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es wird ein vorkonditioniertes Iterationsverfahren zur Lösung des verallgemeinerten Eigenwertproblems vorgestellt; die Struktur der originalen Matrizen wird hierbei nicht verändert. Die vorgeschlagene Methode ist zur Bestimmung der extremen Eigenwerte und zugehörigen Eigenvektoren von großen dünnbesetzten Matrizen geeignet, wie sie durch Diskretisierung (mit Finiten Elementen oder Differenzen) von partiellen Differentialgleichungen entstehen. Die Koppelung der neuen Methode mit dem Verfahren der konjugierten Gradienten ergibt einen besonders wirkungsvollen Algorithmus für diese Problemklasse.
    Notes: Abstract In this paper a preconditioned iterative method suitable for the solution of the generalised eigenvalue problem is presented. The proposed method in which no change in the structure of the original matrices occurs is suitable for the determination of the extreme eigenvalues and their corresponding eigenvectors of large sparse matrices derived from finite element/difference discretisation of partial differential equations. The new method when coupled with the conjugate gradient algorithm yields a powerful algorithm for this class of problems.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2019-06-28
    Description: Low-altitude observations of the energy flux carried by precipitating auroral electrons are compared with simultaneous measurements of the more energetic particle population to determine the spatial relationships between discrete auroras and those regions where the ion population exhibits a full loss cone. Discrete auroras are identified as instances where large, spatially structured energy fluxes (in excess of 10 erg per sq cm s) are carried almost exclusively by precipitating electrons. This comparison makes it possible to infer a relation between discrete auroras and earthward streaming ions observed in the tail. Since discrete auroras occur in association with field-aligned currents, an evaluation is made of the suggestion that auroral field-aligned currents map to the outer boundary of the plasma sheet.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 2395-240
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...