2,554 research outputs found
Damage growth in fibre bundle models with localized load sharing and environmentally-assisted ageing
Slip avalanches in a fiber bundle model
We study slip avalanches in disordered materials under an increasing external
load in the framework of a fiber bundle model. Over-stressed fibers of the
model do not break, instead they relax in a stick-slip event which may trigger
an entire slip avalanche. Slip avalanches are characterized by the number
slipping fibers, by the slip length, and by the load increment, which triggers
the avalanche. Our calculations revealed that all three quantities are
characterized by power law distributions with universal exponents. We show by
analytical calculations and computer simulations that varying the amount of
disorder of slip thresholds and the number of allowed slips of fibers, the
system exhibits a disorder induced phase transition from a phase where only
small avalanches are formed to another one where a macroscopic slip appears.Comment: 6 pages, 6 figure
Bose-Einstein Condensate Dark Matter Halos confronted with galactic rotation curves
We present a comparative confrontation of both the Bose-Einstein Condensate
(BEC) and the Navarro-Frenk-White (NFW) dark halo models with galactic rotation
curves. We employ 6 High Surface Brightness (HSB), 6 Low Surface Brightness
(LSB), and 7 dwarf galaxies with rotation curves falling into two classes. In
the first class rotational velocities increase with radius over the observed
range.The BEC and NFW models give comparable fits for HSB and LSB galaxies of
this type, while for dwarf galaxies the fit is significantly better with the
BEC model. In the second class the rotational velocity of HSB and LSB galaxies
exhibits long flat plateaus, resulting in better fit with the NFW model for HSB
galaxies and comparable fits for LSB galaxies. We conclude that due to its
central density cusp avoidance the BEC model fits better dwarf galaxy dark
matter distribution. Nevertheless it suffers from sharp cutoff in larger
galaxies, where the NFW model performs better. The investigated galaxy sample
obeys the Tully-Fisher relation, including the particular characteristics
exhibited by dwarf galaxies. In both models the fitting enforces a relation
between dark matter parameters: the characteristic density and the
corresponding characteristic distance scale with an inverse power.Comment: published versio
E-BLOW: E-Beam Lithography Overlapping aware Stencil Planning for MCC System
Electron beam lithography (EBL) is a promising maskless solution for the
technology beyond 14nm logic node. To overcome its throughput limitation,
recently the traditional EBL system is extended into MCC system. %to further
improve the throughput. In this paper, we present E-BLOW, a tool to solve the
overlapping aware stencil planning (OSP) problems in MCC system. E-BLOW is
integrated with several novel speedup techniques, i.e., successive relaxation,
dynamic programming and KD-Tree based clustering, to achieve a good performance
in terms of runtime and solution quality. Experimental results show that,
compared with previous works, E-BLOW demonstrates better performance for both
conventional EBL system and MCC system
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