Regional Computer Centres

The Daresbury Laboratory CRAY-1 computer is accessed by means of an IBM 370/165 which is linked to computers at the S.E.R.C s Rutherford Laboratory, C.E.R.N. and workstations in many Universities. The S.E.R.C. network in fact incorporates links to 10 mainframe and 76 minicomputers and to 44 different sites. The CRAY-1 was installed at Daresbury for an initial period of two years, extendable for a third year. The S.E.R.C. buys an average of eight hours per day from CRAY Research Inc. Ltd., and the possibility exists that the machine will be upgraded to a CRAY-1 Model S/500. Proposals are also under consideration for the installation of supercomputers at the two largest University regional computer centres - London and Manchester - and at the S.E.R.C s Rutherford Laboratory where the existing twin IBM 360/195 machines are scheduled for replacement in 1982/3. Again these machines would be accessible via workstations in a number of University departments around the U.K. 

The computation of F is relatively straightforward. We simply consider the free flow of particles into and out of the region in time t. An expression for this flow in the v-direction, for example, can be obtained by considering two thin layers of size v 6t5r Sr that contain particles that move into or out of a cell with its centre at (x,y,z) in time 51 (see figure A3.1.6. ... 

The research was supported in part by Direction des Recherches et Etudes Techniques and the Office of Naval Research. We would like to thank the Scientific Council of the Centre de Calcul Vectoriel pour la Recherche for providing access to a CRAY-1 computer and the Centre Inter Regional de Calcul Electron-ique for providing computational resources. In addition, we would like to thank Professors S. Candel and G. Duvaut for their support and helpful discussions. 

It is important to note, that the symmetrical confidence interval stated in Eq. 2-90 is only obtained if xa is not too far from xc, the centre of the calibration domain. In principle, the confidence region of xa is nonsymmetric. For details of computation and for examples, see BONATE [1990],... 

Figure 3.21 shows an example of the air velocity field in an SOFC of the shape given in Fig. 3.20. The segment shown goes from the centre of the air inlet to the wall of the second tube used for return air (vertical axis) and horizontally covers the innermost part of the tube, where the air (with its oxygen) is forced to deflect back into the outer of the two tubes. This is evidently the most difficult part to model, and most fluid dynamics models allow the number of computation elements to be increased in such regions.

Heavy neutral species In order to model the electron density of heavy elements for subsequent use in the construction of pseudopotential representations of the inner-shell regions near heavy nuclei, atomic DHF calculations are often employed as a starting point [158]. These pseudopotential approximations are used in order to reduce the computational cost of molecular or solid-state calculations of extended systems containing heavy elements. Similarly, atomic DHF calculations are used in the design of atom-centred basis sets, either by the direct... 

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