15,116 research outputs found
On the Laser Stimulation of Low-Energy Nuclear Reactions in Deuterated Palladium
Models to account for the observed experimental results for low-energy
nuclear reactions in palladium-deuteride systems are presented along with
calculated results. The crucial idea is a mechanism of improved probability for
the needed penetration of the Coulomb barrier for a D-D reaction. This
facilitation occurs, in general, with the formation of D^- ions at special
frequency modes (e.g. via phonons) and, specifically for the laser-stimulated
case, with utilization of enhanced optical potential at a selected interface.
Both mechanisms may work individually, or together, to increase the probability
of barrier penetration.Comment: 9 pages, 3 figures, Rev. 1, Significantly enhanced version (resulting
from reviewer's comments), Rev. 2, embedded font and smaller file size.
Keywords: CMNS, D--D+, LENR, optical-potential, resonance-enhancemen
Direct photon production from viscous QGP
We simulate direct photon production in evolution of viscous QGP medium.
Photons from Compton and annihilation processes are considered. Viscous effect
on photon production is very strong and reliable simulation is possible only in
a limited range. For minimally viscous fluid =0.08), direct
photons can be reliably computed only up to 1.3 GeV. With reduced
viscosity (=0.04), the limit increases to 2GeV.Comment: 6 pages, 5 figure
Parallel String Sample Sort
We discuss how string sorting algorithms can be parallelized on modern
multi-core shared memory machines. As a synthesis of the best sequential string
sorting algorithms and successful parallel sorting algorithms for atomic
objects, we propose string sample sort. The algorithm makes effective use of
the memory hierarchy, uses additional word level parallelism, and largely
avoids branch mispredictions. Additionally, we parallelize variants of multikey
quicksort and radix sort that are also useful in certain situations.Comment: 34 pages, 7 figures and 12 table
Have We Known the Mechanisms of High Temperature Superconductivity for a Long Time?
Among the many possible mechanisms suggested for high temperature superconductivity in solid state materials in the past 30 years some are emerging as the likely candidates for the cuprate superconductors discovered in the last few years. Highlights of these models are presented in this paper
Modern Composites - A Renascent Material System
Modern composites constitute an important class of design-and weight-efficient structural materials that are encroaching every sphere of engineering applications
. Superior directional properties , high specific strength and stiffiess properties.design tailoring , ease of manufacturing complex shapes as well as scores of other
attributes make these materials ideally "Designers' Choice'. The current material scenario is such that, unless a real breakthrough is made , these materials are destined to dominate through the twenty -first century. The present paper takes a cursory look into the early uses of composites and their impact on human civilisation as well as potential and growth of modern composites . namely. PMC. MMC and CMC in aerospace applications . A few numerical case studies are also presented to highlight the
importance of CMC for high temperature applications
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