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Digitale Medien

On theR-order of coupled sequences arising in single-step type methods (1988)

Burmeister, W. ; Schmidt, J. W.

Springer

Numerische Mathematik 53 (1988), S. 653-661

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ISSN: 0945-3245

Schlagwort(e): AMS(MOS): 65H10 ; 15A48 ; CR: G1.5

Quelle: Springer Online Journal Archives 1860-2000

Thema: Mathematik

Notizen: Summary As shown in preceding papers of the authors, the verification of anR-convergence order τ for sequences coupled by a system (1.1) of basic inequalities can be reduced to the positive solvability of system (3.3) of linear inequalities. Further, the bestR-order $$\bar \tau$$ implied by (1.1) is equal to the minimal spectral radius of certain matrices composed from the exponents occuring in (1.1). Now, these results are proven in a unified and essentially simpler way. Moreover, they are somewhat extended in order to facilitate applications to concrete methods.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01397134

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Digitale Medien

Chemistry of male mandibular gland secretions ofPhilanthus basilaris cresson andPhilanthus bicinctus (Mickel) (Hymenoptera: Sphecidae) (1987)

McDaniel, C. A. ; Howard, R. W. ; O'Neill, K. M. ; [weitere]

Springer

Journal of chemical ecology 13 (1987), S. 227-235

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ISSN: 1573-1561

Schlagwort(e): Philanthus ; Hymenoptera ; Sphecidae ; pheromone ; scent-marking ; 2-alkanones ; fatty acids ; ethyl esters ; alkenals ; N,N-dimethylhy-drazine ; methyl esters ; EI-MS ; CI-MS ; methoxymercuration ; methylthiolation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Chemie und Pharmazie

Notizen: Abstract Detailed chemical characterizations are provided for the species-specific mixtures of marking pheromones utilized by the male beewolvesPhilanthus basilaris andP. bicinctus. Successful analysis of these complex mixtures of 2-ketones, fatty acids, ethyl esters, and aldehydes was facilitated by the treatment of the crude extracts with 1,1-dimethylhydrazine and direct analysis of the resulting hydrazones, methyl esters, and starting ethyl esters by GC-MS.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01025883

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