A serial Fortran 77 micromagnetics code, which simulates the behaviour of thin-lm media, was parallelised using both shared memory and message passing paradigms, and run on an SGI Challenge, a Cray T3D and an SGI Origin 2000. We report the observed performance of the code, noting some important eeects due to cache behaviour. We also demonstrate how certain commonly-used presentation methods can...

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...

The Arctic is experiencing environmental changes at unprecedented rates. These changes are spreading throughout the entire food web, affecting apex predators such as seabirds. Brünnich’s guillemot Uria lomvia populations in Svalbard archipelago have significantly declined since the mid-1990s. For longlived species such as seabirds, population growth rate is highly sensitive to changes in adult ...

This paper describes a parallel implementation of the discontinuous Galerkin method. The discontinuous Galerkin is a spatially compact method that retains its accuracy and robustness on non-smooth unstructured grids and is well suited for time dependent simulations. Several parallelization approaches are studied and evaluated. The most natural and symmetric of the approaches has been implemente...

Abstract Groundwater drought response to meteorological forcing depends on initial hydrological conditions. This makes it difficult characterise groundwater droughts and identify the vulnerability of aquifers. The objective is increase understanding memory in lowland post-glacial environments. Eighty-one hydrographs are analysed, using standardised level index (SGI) precipitation index. Memory ...

Abstract This work focused on producing and characterizing high silicon cast irons (microstructural analysis, tensile properties, damping capacity, elastic properties). Moreover, it also evaluated the influence of RE alloying capacity. The samples present a step-casting geometry to verify cooling rate’s impact their microstructures and, consequently, mechanical properties. Si SGI presented full...

We introduce a parallelization of the maximumlikelihood cosine transform. This transform consists of a computationally intensive iterative fitting process, but is readily decomposed for parallel processing. The parallel implementation is not only scalable, but has also brought the execution time of this previously intractable problem to feasible levels using contemporary and cost-efficient high...

The generation of bursting spike activity in the deeper layers of the superior colliculus (SC) is a critical determinant of decision making in the initiation of orienting behaviors, such as saccades. The bursting activity exhibits a typical threshold effect that may arise from a nonlinear signal amplification process in the deeper layers of the SC. We used whole-cell patch-clamp recordings in r...