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Digitale Medien

The thermodynamics of aqueous borate solutions I. Mixtures of boric acid with sodium or potassium borate and chloride (1987)

Simonson, J. M. ; Roy, R. N. ; Roy, L. N. ; [weitere]

Springer

Journal of solution chemistry 16 (1987), S. 791-803

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ISSN: 1572-8927

Schlagwort(e): Borates ; aqueous ; thermodynamics ; electrolytes ; Harned cells

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract Potentials for the cell without liquid junction $$H_2 ,Pt\backslash B(OH)_3 (m_1 ), MB(OH)_4 (m_2 ), MCl(m_3 )\backslash AgClAg$$ where M is sodium or potassium are reported over a range of ionic strength to I=3 mol-kg−1 at 5 to 55°C. Total boron concentration in the solutions was restricted to low levels to minimize formation of polynuclear boron species. Cell potentials are treated with the Pitzer ion interaction treatment for mixed electrolytes, with linear ionic strength dependence assumed for the activity coefficient of undissociated boric acid. Trace activity coefficients of sodium and potassium borates in chloride media are calculated at various temperatures.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00650749

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Digitale Medien

Computer algorithms for calculating efficient initial vectors for subspace iteration method (1987)

Cheu, Tsu-Chien ; Johnson, C. Philip ; Craig, Roy R.

Chichester [u.a.] : Wiley-Blackwell

International Journal for Numerical Methods in Engineering 24 (1987), S. 1841-1848

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ISSN: 0029-5981

Schlagwort(e): Engineering ; Engineering General

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Mathematik , Technik allgemein

Notizen: In this paper, the effects of selecting initial vectors on computation efficiency for a subspace iteration method are investigated. Four algorithms are used for selecting the initial vectors. First, arbitrary starting iteration vectors are chosen according to Bathe and Wilson's algorithm.1 In the other algorithms, the initial vectors are the retrieved eigenvectors from the Guyan and quadratic reduction methods. Improvement of the eigenvalue approximations of the subspace iteration method over reduction methods is presented. The computation effort is examined for the various algorithms used for initial iteration vectors.

Zusätzliches Material: 8 Tab.