For the confluent hypergeometric functions U (a, b, z) and M (a, b, z) asymptotic expansions are given for a -~ ,o. The expansions contain modified Bessel functions. For real values of the parameters rigorous error bounds are given.
Solution of a diffusion of dust problem in terms of hypergeometric functions
โ Scribed by S.L. Kalla; A. Al-Zamil
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 437 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0895-7177
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โฆ Synopsis
&&e1 transforms have been widely used in solving boundary value problems poeed in cylindrical coordinates. A modified form of the Hankel transform and some of its propertiea are considered in connection with the problem of transport of a heavy pollutant (dust) from ground level aerial sources in a strip 0 5 2 5 L within the framework of diffusion theory. Pollutant concentration for I > L is obtained using an integral representation of the solution of an analogous problem with an arbitrary initial pollutant distribution. The results are given in closed form using hypergeometric functions and some special csses are mentioned. Pollutant concentrations in the zz-plane, for different values of the parameters, are represented by some contour plots.
๐ SIMILAR VOLUMES
An asymptotic expansion of the confluent hypergeometric function U(a,b,x) for large positive 2a-b is given in terms of modified Bessel functions multiplied by Buchholz polynomials, a family of double polynomials in the variables b and x with rational coefficients.