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  • 1970-1974  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archive for rational mechanics and analysis 54 (1974), S. 301-327 
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract This paper studies the boundary-value problem arising from the behaviour of a fluid occupying the region -1≦x≦1 between two rotating disks, rotating about a common axis perpendicular to their planes when the disks are rotating with the same speed Ω0 but in the opposite sense. The equations which describe the axially symmetric similarity solutions of this problem are $$\varepsilon H^{iv} + HH''' + GG' = 0$$ $$\varepsilon G'' + HG' - H'G = 0$$ with the boundary conditions $$H( \pm 1) = H'( \pm 1) = 0$$ $$G( - 1) = - 1,{\text{ }}G(1) = 1$$ where ɛ=v/2Ω0 and v is the kinematic viscosity. The existence of an odd solution 〈H(x, ɛ), G(x, ɛ)〉 is established. This particular solution satisfies many special conditions, for example, G′ (x, ɛ)〉0. Moreover, precise estimates are obtained on the size and behaviour of the solution as ɛ ↓ 0.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Computing 7 (1971), S. 17-24 
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Diese Arbeit beinhaltet ein fundamentales algebraisches Ergebnis der Theorie des vektoriellen ε-Algorithmus. Als Verknüpfungen dieses Algorithmus werden verwendet die Addition, die Subtraktion und der inverse Vektor mit komplexen Komponenten. Die ersten beiden Operationen sind definiert durch komponentenweise Addition beziehungsweise Subtraktion. Seiz=(z 1, ...,z N ) ein vorgegebener Vektor, so soll der inverse Vektor auf folgende Weise gebildet werden. $$z^{ - 1} = \frac{{(\bar z_1 ,...,\bar z_N )}}{{\sum\limits_{i = 1}^N {\left| {z_i } \right|^2 } }},$$ wobei der Querstrich die konjugiert komplexe Zahl bedeutet. Unter der Voraussetzung, daß der Vektorε s (m) aus den Anfangsbedingungenε −1 (m) =0, (m=1, 2, ...),ε 0 (m) =s m , (m=0,1, ...) mittels der Beziehungenε s+1 (m) =ε s-1 (m+1) +(ε s (m+1) -ε s (m) )−1, (m, s=0,1,...) gebildet werden kann und unter der weiteren Voraussetzung, daß die Rekursionsformel $$\sum\limits_{i = 0}^n {\beta _i s_{m + 1} = \left( {\sum\limits_{i = 0}^n {\beta _i } } \right)} a,(m = 0,1,...)$$ (m=0,1,...) auch für die Anfangsbedingungen gilt, wobei die Koeffizienten β i (i=0,1,...,n) reell und ungleich Null sein sollen, wird fürm=0,1, ... bewiesen, daß die Beziehungenε 2n (m) =a gilt für $$\sum\limits_{i = 0}^n {\beta _i } \ne 0$$ undε 2n (m) =0 gilt, wenn $$\sum\limits_{i = 0}^n {\beta _i } = 0$$ .
    Notes: Summary This paper contains the proof of a fundamental algebraic results in the theory of the vector ε-algorithm. The relationships of this algorithm involve the addition, subtraction and inversion of vectors of complex numbers: the first two operations are defined by component-wise addition and subtraction; the inverse of the vectorz=(z 1 ...,z N ) is taken to be $$z^{ - 1} = \frac{{(\bar z_1 ,...,\bar z_N )}}{{\sum\limits_{i = 1}^N {\left| {z_i } \right|^2 } }}$$ where the bar denotes a complex conjugate. It is proved that if vectorsε s (m) can be constructed from the initial valuesε −1 (m) =0, (m=1,2,...),ε 0 (m) =s m , (m=0,1, ...) by means of the relationshipsε s+1 (m) =ε s-1 (m+1) +(ε s (m+1) -ε s (m) )−1, (m, s=0,1, ...); and if the recursion relations $$\sum\limits_{i = 0}^n {\beta _i s_{m + i} = \left( {\sum\limits_{i = 0}^n {\beta _i } } \right)} a,(m = 0,1,...)$$ hold for the initial values, where the coefficients β i (i=0,1,...,n) are real and βn≠0, then form=0,1, ...,ε 2s (m) =a, if $$\sum\limits_{i = 0}^n {\beta _i } \ne 0$$ andε 2s (m) =0, if $$\sum\limits_{i = 0}^n {\beta _i } = 0$$ .
    Type of Medium: Electronic Resource
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