Showing papers in "Computer Physics Communications in 1983"

TL;DR: The DAP, the extended version of the FORTRAN language used to program it and some of the new types of algorithm that are used to exploit highly parallel computer architectures are described.

TL;DR: In this paper, a new algorithm is described for calculating the triple-excitation contribution to the fourth-order Many-Body Rayleigh-Schrodinger Perturbation Theory (MB RSPT).

TL;DR: It is shown that for calculations with larger particle systems the program runs faster on the 205 than on the Cray-1 by about a factor of two, and the CPU time for particle numbers of more than 2048 becomes prohibitively large.

TL;DR: A new propagation algorithm is obtained which requires less memory overhead and is more stable than previously suggested methods and is adaptable to inhomogeneously broadened media.

TL;DR: In this article, the evaluation of Bessel functions of the first and second kinds, covering a wide range of complex arguments and integer orders, is required in the determination of the intensity of acoustic reflection from absorbing bodies.

TL;DR: In this paper, a general method to calculate the angular distribution in a chain of decaying paritcles is described, and a computer program has been developed to simulate events that can be compared with experimental data.

TL;DR: In this article, the ill-conditioned nature of sums-of-exponentials analyses is confirmed and quantified, using synthetic noisy data, and the magnification of errors is plotted for various two-exponential models, to illustrate its dependence on the ratio of decay constants, and on the ratios of amplitudes of the contributing terms.

TL;DR: In this paper, a computational implementation of the polarization propagator method is outlined, in which a list of symbolic matrix elements is generated and the individual terms which contribute to the matrix elements are reordered so that the list of two-electron integrals can be processed sequentially.

TL;DR: In this paper, a programme HSCF for the resolution des equations de Roothaan-hartree-Fock non relativistes en utilisant une base analytique d'orbitales gaussiennes, en vue d'obtenir les energies totales and les energies orbitales atomiques.

TL;DR: In this article, a Hartree-Fock-Slater program and a compatible box potential program are developed to generate complete basis sets for configuration interaction calculations using many-body perturbation theory.

TL;DR: Programme CFCUBE as mentioned in this paper reduire l'integrale de Fourier tridimensionnelle definissant la fonction de Green, en une integrale monodimensionnelsle, en theorie de l'elasticite lineaire.

TL;DR: In this article, pure SU(4) gauge theory is simulated by Monte Carlo methods on an 84 lattice and the method of Metropolis et al. is used to equilibriate the space time lattice.

TL;DR: In this paper, three finite element methods are applied to describe static, spherically symmetric fluid bodies in general relativity, and the usual Ritz method with linear splines is unconditionally unstable, although the instability is mild.

TL;DR: A Fourier method solution for the classical wave equation which overcomes the difficulty of the periodicity of the trigonometric functions is presented in this paper, which is a Fourier-based solution to the wave equation.

TL;DR: In this paper, a new code, GALA, based on reduced MHD equations is developed, which is used to analyse the linear and nonlinear behavior of the internal kink mode in equilibria which are generated by a simple relaxation procedure.

TL;DR: In this paper, the kink interactions in the Higgs model are studied numerically using a finite element Galerkin method and a clear picture regarding the'resonances' is presented.

TL;DR: How the OLYMPUS COMPOSITOR can be used to regenerate Fortran software semi-automatically so that it meets improved documentation standards is discussed, by means of an example,.

TL;DR: In this article, a method for accelarating the convergence of iterative processes on a sequence of grids is proposed, which makes use of the decomposition of the difference solution into powers of the discretization step.

TL;DR: In this article, a new method for plotting contour maps of equal directional derivatives is proposed, which does not require numerical manipulation of the data as it is based on an optical phenomenon, the moire effect.

TL;DR: A new computer system with an entirely new processor design is described and demonstrated on a very small trial lattice and how the machine can be applied to lattice models in theoretical physics is described.

TL;DR: In this paper, the Schrodinger equation is solved by finite difference methods on a grid of mesh points, and complex potentials at the points near the boundaries are introduced to minimize the reflection of the waves by the boundaries.

TL;DR: A generalized algorithm for the interpretation of various kinetic experiments performed at Purnima facility at TROMBAY is formulated for the solution of the inverse problem of reactor kinetics equations as discussed by the authors.

TL;DR: It is demonstrated in this paper that with the proper choice of sorting algorithm, a nominal amount of sorting to keep physically adjacent particles near particles with neighboring array indices can reduce random access to slow memory, increase the efficiency of the I/O system, and hence, reduce the required computing time.

TL;DR: The spline-based method for solving the Fredholm integral equation of the first kind, earlier suggested by Beniaminy and Deutsch, is discussed in this paper, where the inaccuracy of the solution is estimated.

TL;DR: In this article, it is argued that the effect of rounding error in the evaluation of inner products grows slowly if at all, and that this allows the method to be applied to slightly non-Hermitian matrices as well.

TL;DR: In this article, it was shown that if we use the generalized spherical harmonics as normal mode eigenfunctions, the problems arising from the rotation and ellipticity of the Earth can be solved rather easily without imposing too severe limitations on the terrestrial spectral range.