Journal Article

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2017-05-24
16:47
[FZJ-2017-03800] Journal Article

Critical phenomena on k -booklets
ddc:530
We define a "k-booklet" to be a set of k semi-infinite planes with -infinity < x < infinity and y >= 0, glued together at the edges (the "spine") y = 0. On such booklets we study three critical phenomena: self-avoiding random walks, the Ising model, and percolation. [...]

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2017-05-24
16:43
[FZJ-2017-03799] Journal Article
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Phase transitions in cooperative coinfections: Simulation results for networks and lattices
ddc:530
We study the spreading of two mutually cooperative diseases on different network topologies, and with two microscopic realizations, both of which are stochastic versions of a susceptible-infected-removed type model studied by us recently in mean field approximation. There it had been found that cooperativity can lead to first order transitions from spreading to extinction. [...]

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2017-05-24
14:38
OpenAccess [FZJ-2017-03798] Journal Article
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Shift of subtropical transport barriers explains observed hemispheric asymmetry of decadal trends of age of air
ddc:550
In response to global warming the Brewer–Dobson circulation in the stratosphere is expected to accelerate and the mean transport time of air along this circulation to decrease. This would imply a negative stratospheric age of air trend, i.e. [...]
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2017-05-24
13:47
[FZJ-2017-03794] Journal Article
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Horizontal propagation of large amplitude mountain waves in the vicinity of the polar night jet
ddc:550
We analyze a large-amplitude mountain wave event, which was observed by a ground-based lidar above New Zealand between 31 July and 1 August 2014. Besides the lidar observations, European Centre for Medium-Range Weather Forecasts (ECMWF) data, satellite observations, and ray tracing simulations are utilized in this study. [...]
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2017-05-24
09:16
OpenAccess [FZJ-2017-03778] Journal Article
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Integration of Continuous-Time Dynamics in a Spiking Neural Network Simulator
ddc:610
Contemporary modeling approaches to the dynamics of neural networks include two important classes of models: biologically grounded spiking neuron models and functionally inspired rate-based units. We present a unified simulation framework that supports the combination of the two for multi-scale modeling, enables the quantitative validation of mean-field approaches by spiking network simulations, and provides an increase in reliability by usage of the same simulation code and the same network model specifications for both model classes. [...]
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2017-05-23
09:47
OpenAccess [FZJ-2017-03757] Journal Article
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Constructing Neuronal Network Models in Massively Parallel Environments
ddc:610
Recent advances in the development of data structures to represent spiking neuron network models enable us to exploit the complete memory of petascale computers for a single brain-scale network simulation. In this work, we investigate how well we can exploit the computing power of such supercomputers for the creation of neuronal networks. [...]
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2017-05-23
07:37
DBCoverage [FZJ-2017-03743] Journal Article

Dynamical amplification of magnetoresistances and Hall currents up to the THz regime
Scientific reports -, - (2017)
ddc:000
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2017-05-22
10:03
OpenAccess [FZJ-2017-03730] Journal Article
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Magnetic subunits within a single molecule–surface hybrid
ddc:530
Magnetic molecule–surface hybrids are ideal building blocks for molecular spintronic devices due to their appealing tailorable magnetic properties and nanoscale size. So far, assemblies of interacting molecular-surface hybrids needed for spintronic functionality were generated by depositing aromatic molecules onto transition-metal surfaces, resulting in a random arrangement of hybrid magnets due to the inherent and strong hybridization. [...]
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2017-05-19
11:41
[FZJ-2017-03720] Journal Article
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Design and optimization of a portable LQCD Monte Carlo code using OpenACC
ddc:530
The present panorama of HPC architectures is extremely heterogeneous, ranging from traditional multi-core CPU processors, supporting a wide class of applications but delivering moderate computing performance, to many-core Graphics Processor Units (GPUs), exploiting aggressive data-parallelism and delivering higher performances for streaming computing applications. In this scenario, code portability (and performance portability) become necessary for easy maintainability of applications; this is very relevant in scientific computing where code changes are very frequent, making it tedious and prone to error to keep different code versions aligned. [...]

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2017-05-18
16:33
[FZJ-2017-03699] Journal Article
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Density functional study of structure and dynamics in liquid antimony and Sb n clusters
ddc:540
Density functional/molecular dynamics simulations have been performed on liquid antimony (588 atoms and six temperatures between 600 K and 1300 K) and on neutral Sb clusters with up to 14 atoms. We study structural patterns (coordination numbers, bond angles, and ring patterns, structure factors, pair distribution functions) and dynamical properties (vibration frequencies, diffusion constants, power spectra, dynamical structure factors, viscosity) and compare with available experimental results and with the results of our previous simulations on Bi [...]
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