Three parallel algorithms for classical molecular dynamics are presented. The first assigns each processor a fixed subset of atoms; the second assigns each a fixed subset of inter–atomic forces to compute; the third assigns each a fixed spatial region. The algorithms are suitable for molecular dynamics models which can be difficult to parallelize efficiently — those with short–range forces wher...

DYNAMO is the first simulation code to dynamically and self-consistently model the evolution of the geomagnetic field. In this paper, we present the results of recent efforts to parallelize and optimize this pseuodospectral code for massively parallel architectures. On the Cray T3E, these modifications have resulted in a sustained performance of well-over 100 Gflops, representing more than a 10...

The NAS Kernels Benchmark Program (NASKER) has been used to measure performance on the Cray C90, Cray Y-MP, Cray-2, Alliant FX/2800 and Connection Machine 2 computer systems. The ground rules for this test are reiterated, with some changes from the original proposal. On each system, tests are performed using varying numbers of processors. Performance results are presented at various tuning leve...

Numerical simulations of groundwater flow and chemical transport through three-dimensional heterogeneous porous media are described. The authors employ two CRAY supercomputers for different parts of the decoupled calculation: the flow field is computed on the T3D massively parallel computer, and the contaminant migration is simulated on the C90 vector supercomputer. The authors compare simulati...

The design and performance of the implicit ow solver RANS-MP are discussed. The eecient bi-directional multi-partition solver algorithm, in conjunction with the MPI and newly developed MPI I/O libraries, leads to truly portable program text and performance. Computational results are presented for cache-based distributed-memory systems|an MPP (IBM SP2) and a LAN (SGI cluster)|and a vector machin...

Plate-like hydrated tungsten trioxide (3WO(3)·H(2)O) films were grown on a fluorine doped tin oxide (FTO) coated transparent conductive substrate via an efficient, facile and template-free hydrothermal method. The film exhibited a fast coloration/bleaching response (t(c90%) = 4.3 s and t(b90%) = 1.4 s) and a high coloration efficiency (112.7 cm(2) C(-1)), which were probably due to a large surf...

Loading rates affect the behavior of concrete specimens from beginning loading process until failure. At rather high rates, longitudinal deformations in under a compressive load are practically elastic up ultimate limit state. It has been previously demonstrated that transverse effectively indicate high-strength entire static range. A theoretical model for cylindrical specimen failure load, bas...

GCR (Generalized Conjugate Residual) and Omin (Orthomin) are iterative methods for approximating the solution of unsymmetric linear systems. The S-step generalization of these methods has been derived and studied in past work. The S-step methods exhibit improved convergence properties. Also, their data locality and parallel properties are enhanced by forming blocks of s search direction vectors...

In experimental economics there exists a lively debate about the independence of observations. Although opinions on the issue differ widely, all concerns regard the independence of subjects’ behavior within one session or experiment. This paper attempts to shed some light on the independence of observations between experiments, if they are generated by the same subjects. We analyze experiments ...

A relevance, distinctiveness and plausibility (RDP) analysis is a conceptual framework that can be used to identify when potential confounds are a problem for interpreting experimental results. We illustrate this analysis using the creation or enhancement of natural group identity by the means of priming manipulations as employed in the experiments of five target papers. Such priming manipulati...