6,959 research outputs found
The MC@NLO 3.2 Event Generator
This is the user's manual of MC@NLO 3.2. This package is a practical
implementation, based upon the HERWIG event generator, of the MC@NLO formalism,
which allows one to incorporate NLO QCD matrix elements consistently into a
parton shower framework. Processes available in this version include the
hadroproduction of single vector and Higgs bosons, vector boson pairs, heavy
quark pairs, single top, lepton pairs, and Higgs bosons in association with a W
or Z. Spin correlations in decays are included for all processes except ttbar,
single-t, ZZ, and WZ production. This document is self-contained, but we
emphasise the main differences with respect to previous versions.Comment: 23 pages Late
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Evaluation of power generation operations in response to changes in surface water reservoir storage
We used a customized, river basin-based model of surface water rights to evaluate the response
of power plants to drought via simulated changes in reservoir storage. Our methodology
models surface water rights in 11 river basins in Texas using five cases: (1) storage decrease of
existing capacity of 10%, (2) storage decrease of 50%, (3) complete elimination of storage,
(4) storage increase of 10% (all at existing locations), and (5) construction of new reservoirs
(at new locations) with a total increase in baseline reservoir capacity for power plant cooling
of 9%. Using the Brazos River basin as a sample, we evaluated power generation operations in
terms of reliability, resiliency, and vulnerability. As simulated water storage decreases,
reliability generally decreases and resiliency and vulnerability remain relatively constant. All
three metrics remain relatively constant with increasing reservoir storage, with the exception
of one power plant. As reservoir storage changes at power plants, other water users in the
basin are also affected. In general, decreasing water storage is beneficial to other water users
in the basin, and increasing storage is detrimental for many other users. Our analysis reveals
basin-wide and individual power plant-level impacts of changing reservoir storage,
demonstrating a methodology for evaluation of the sustainability and feasibility of
constructing new reservoir storage as a water and energy management approach.Mechanical Engineerin
A Positive-Weight Next-to-Leading-Order Monte Carlo for e+e- Annihilation to Hadrons
We apply the positive-weight Monte Carlo method of Nason for simulating QCD
processes accurate to Next-To-Leading Order to the case of e+e- annihilation to
hadrons. The method entails the generation of the hardest gluon emission first
and then subsequently adding a `truncated' shower before the emission. We have
interfaced our result to the Herwig++ shower Monte Carlo program and obtained
better results than those obtained with Herwig++ at leading order with a matrix
element correction.Comment: 21 pages, 11 figures, 2 tables Reason for replacement: minor
corrections, typos and 1 changed referenc
An international information literacy certificate: opportunity or dead-end?
This paper presents the case against developing an International Information Literacy Certificate.
After defining information literacy (IL) the author identifies that there is diversity amongst those
who need to learn about IL, that they have diverse needs and will be in diverse contexts. An
individualâs IL needs also change through that personâs lifetime. The author identifies IL as a
complex subject and discusses the implications of this complexity for learning, teaching and
assessment. The âstandardsâ approach to IL, ennumerating qualities and activities, is criticised.
Three examples of a context-sensitive approach to IL education are given (in a university, a
workplace and a school). Taking the example of the European Computer Driving Licence, the
author argues that IL is like neither driving nor computer competency. It is questioned whether an
IL certificate would help to raise the prestige of IFLA and librarians, and problems of consensus
and practicality are discussed. The author concludes that the certificate would be a âdead-endâ.
However, she finishes by confirming that there could still be a role for an IL foundation. She
proposes that it starts with an agenda of âIL for the childâ, and she confirms the importance of IL
in todayâs information society
Results of a search for deuterium at 25-50 GC/c using a magnetic spectrometer
A method is presented for separately identifying isotopes using a Cerenkov detector and a magnet spectrometer. Simulations of the method are given for separating deuterium from protons. The simulations are compared with data gathered from the 1979 flight of the New Mexico State University balloonborne magnet spectrometer. The simulation and the data show the same general characteristics lending credence to the technique. The data show an apparent deuteron signal which is (11 + or - 3)% of the total sample in the rigidity region 38.5 to 50 GV/c. Until further background analysis and subtraction is performed this should be regarded as an upper limit to the deuteron/(deuteron+proton) ratio
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