Zobrazeno 1 - 10
of 29
pro vyhledávání: '"J S Rollett"'
Autor:
J. S. Rollett
Computing Methods in Crystallography is a collection of lectures delivered at a Summer School, held in Oxford in August 1962. The book presents the underlying mathematics and computing methods in crystallography. The text covers topics on the algebra
Autor:
R. W. Leland, J. S. Rollett
Publikováno v:
Twelfth International Conference on Numerical Methods in Fluid Dynamics ISBN: 9783540536192
Iterative solution methods for large, sparse linear systems of equations usually require significantly less time and memory than direct methods, and so are important in solving the systems which often arise in computational fluid dynamics. There are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10ef5069d329de556245054a4207870d
https://doi.org/10.1007/3-540-53619-1_189
https://doi.org/10.1007/3-540-53619-1_189
Publikováno v:
International Journal for Numerical Methods in Fluids. 10:925-945
SUMMARY A series of numerical experiments on the Cray XMP/48 and on the Cray 2 investigate the robustness and economy of direct and unsymmetric conjugate gradient (CG) type methods for the solution of matrix systems arising from a 3D FEM discretizati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::51e87f3e8381e3384bb6c0078e2f5b0f
https://doi.org/10.1002/fld.1650100806
https://doi.org/10.1002/fld.1650100806
Publikováno v:
Applications of Supercomputers in Engineering II ISBN: 9781851666959
Efficient numerical algorithms for the solution of fluid flow problems on sequential machines are the major focus of research within our group. However with the recent acquisition of a MIMD machine, attempts have been made to obtain parallel implemen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97d979641e4b73bde96bd32f5619a27a
https://doi.org/10.1007/978-94-011-3660-0_2
https://doi.org/10.1007/978-94-011-3660-0_2
Publikováno v:
Numerical Treatment of the Navier-Stokes Equations ISBN: 9783528076306
This paper describes an efficient line solver for the coupled equations. The calculation procedure, called SCGS/LS(Symmetrical Coupled Gauss-Seidel/Line Solver), is based on the SCGS scheme. The technique is applied to the driven cavity problem for t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::984988c87dbd4fe19af4a396d9cb34b0
https://doi.org/10.1007/978-3-663-14004-7_13
https://doi.org/10.1007/978-3-663-14004-7_13
Autor:
A. R. Davies, J. S. Rollett
Publikováno v:
Acta Crystallographica Section A. 32:17-23
A method is described which provides phase estimates for structure factors. The data required are the moduli of some or all of the structure factors and phases for a sub-set of them. The Fourier components corresponding to a real square root of the e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9c61613b7954d5da747584e8e2d602db
https://doi.org/10.1107/s056773947600003x
https://doi.org/10.1107/s056773947600003x
Autor:
E. Prince, B. E. Robertson, A. J. C. Wilson, R. E. Marsh, J. S. Rollett, K. Huml, D. Schwarzenbach, W. Gonschorek, S. C. Abrahams, Th. Hahn, H. D. Flack
Publikováno v:
Acta Crystallographica Section A Foundations of Crystallography. 45:63-75
The Subcommittee has attempted to elucidate the nature of problems encountered in the definition and use of statistical descriptors as applied to crystallography and to propose procedural improvements. The report contains (a) a dictionary of statisti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c007d3013067414ce9864c66e446495
https://doi.org/10.1107/s0108767388009596
https://doi.org/10.1107/s0108767388009596
Publikováno v:
Acta Crystallographica Section A. 32:311-315
The formal refinement methods of least-squares adjustment or difference-map analysis give atomic positions in protein structures with standard deviations which are large compared with the standard deviations of accepted molecular dimensions. This pap
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b60a159126c29ccc4f2b0fc244762e6
https://doi.org/10.1107/s0567739476000685
https://doi.org/10.1107/s0567739476000685
Publikováno v:
Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 30:731-737
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0a1e0950a6b08eca04e71141a907a96
https://doi.org/10.1107/s0567740874003608
https://doi.org/10.1107/s0567740874003608
Autor:
J S Rollett, L A Higgs
Publikováno v:
Proceedings of the Physical Society. 79:87-93
The large uncertainties inherent in correction methods using linear equations are expressed in terms of the behaviour of the Fourier transforms of the observed profile and the apparatus function. The Fourier transform method is described in a form wh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a36154b8783bcbd1898a29e06fdbd903
https://doi.org/10.1088/0370-1328/79/1/313
https://doi.org/10.1088/0370-1328/79/1/313