12,187 research outputs found
Pion Charge Exchange on Deuterium
We investigate quantum corrections to a classical intranuclear cascade
simulation of pion single charge exchange on the deuteron. In order to separate
various effects the orders of scattering need to be distinguished and, to that
end, we develop signals for each order of scattering corresponding to
quasi-free conditions. Quantum corrections are evaluated for double scattering
and are found to be large. Global agreement with the data is good.Comment: 30 pages, 12 figure
The pentaquark in K-plus-d total cross section data
An analysis of -d total cross section data is undertaken to explore
possible effects of the recently observed resonance in the S=+1 hadronic system
with mass around 1.55 GeV. It is found that a structure corresponding to the
resonance is visible in the data. The width consistent with the observed
deviation from background is found to be MeV and the mass is
GeV/c for spin-parity \h^+ and \
GeV/c for \h^-. The errors are one standard deviation and statistical
only.
\Comment: 10 pages, 5 figures Replaced to correct references, add and correct
text. No change in content. More discussion of errors, increased error on
width, corrected one figur
MANSEE data analysis results
Results of the data reduction and analysis for the Marine Navigation Systems Evaluation Experiment (MANSEE) are presented. Topics discussed include: the MANSEE test; the navigation sensors which were exercised; the ground truth instrumentation and the processing of ground truth data; and the residual statistics for individual navigation sensors. Residuals were calculated by differencing the actual measurements with anticipated measurements computed from the ground truth trajectory. The results obtained by using the SEAMAP program to filter data from the navigation sensors are also presented. The resultant filtered trajectories were differenced with the corresponding ground truth trajectories to obtain navigation position and velocity errors
Anisotropic imbibition on surfaces patterned with polygonal posts
We present and interpret lattice Boltzmann simulations of thick films
spreading on surfaces patterned with polygonal posts. We show that the
mechanism of pinning and depinning differs with the direction of advance, and
demonstrate that this leads to anisotropic spreading within a certain range of
material contact angles.Comment: DSFD Proceedings 201
Comment on: Failure of the Work-Hamiltonian Connection for Free-Energy Calculations [Phys Rev Lett 100, 020601 (2008), arXiv:0704.0761]
We comment on a Letter by Vilar and Rubi [arXiv:0704.0761].Comment: one page, including one figure; to appear in Phys Rev Let
The evaluation of waste tyre pulverised fuel for NOx reduction by reburning
The combustion of coal for power generation will continue to play a major role in the future, however, this must be achieved using cleaner technologies than we use at present. Scrap tyre arisings in the UK are 400,000 tonnes per year amounting to 30 million tyres and in the EU as a whole, more than 2.5 million tonnes of tyres per year are scrapped. The recent EC Waste Landfill Directive (1999) sets a deadline for the banning of whole and shredded tyres from landfill sites by 2006. Consequently, there is an urgent need to find a mass disposal route for tyres. We describe, in this paper, a novel use for tyre rubber pulverised fuel in a NOx reburning process which may have an application in power station boilers. This method of disposal could represent a way of combining waste disposal, energy recovery and pollution control within one process. A preliminary study of micronised tyre combustion was undertaken to identify the suitable size ranges for application in NOx reduction by reburning. Tests were performed in a down-fired, pulverised fuel combustor (PFC) operating at about 80 kW. Superior combustion characteristics, i.e. burnout were achieved with particle sizes less than 250 ÎĽm. A South African coal was used as the primary fuel in the reburn tests and the tyre was fed pneumatically via a separate feed system. Parameters studied, were, reburn zone stoichiometry and reburn fuel fraction. Additionally, the carbon content of the ash was carefully monitored for any effect on burnout at the fuel rich reburn stoichiometries. The NOx reductions achieved with tyres are compared with reburning with coal. NOx reductions up to 80% were achieved with tyres at half of the reburn fuel feed rate required to achieve the same reductions by coal. The results have been evaluated within the context of other studies available in the literature on NOx reburning by bituminous coal, brown coal, gas and biomass
Jesus Christ and War
https://digitalcommons.acu.edu/crs_books/1269/thumbnail.jp
A Question of Triumph: Effectively Measuring the Success of Intelligence against Terrorism
As intelligence programs continue to be expanded in order to combat the growing threat of terrorism seen around the globe, many critics have questioned whether the success of intelligence against terrorism can be effectively measured. Through the implementation of the United States PATRIOT Act and the mass data collection programs which it created, intelligence programs have gained access to the private interactions and intentions of government officials, civilians, and businesses, foreign and domestic, while terror acts continue to occur on a, seemingly, daily basis. This article seeks to show how the success of intelligence against terrorism can, in fact, be effectively measured when examined in regard to the various aspects of terrorism it seeks to prevent; while acknowledging the continued existence of terrorist groups as a whole. It becomes clear, through the examination of the post-9/11 terror plots, attacks, and bolstered counterstrategies against them, that success of intelligence against terrorism can be effectively measured and is clearly evident
- …