29,239 research outputs found
Upgrade of the ATLAS Liquid Argon Calorimeters for the High-Luminosity LHC
The increased particle flux at the high luminosity phase of the Large Hadron
Collider (HL-LHC), with instantaneous luminosities of up to 7.5 times the
original design value, will have an impact on many sub-systems of the ATLAS
detector. This contribution highlights the particular impacts on the ATLAS
liquid argon calorimeter system, together with an overview of the various
upgrade plans leading up to the HL-LHC. The higher luminosities are of
particular importance for the forward calorimeters (FCal), where the expected
increase in the ionization load poses a number of problems that can degrade the
FCal performance such as beam heating and space-charge effects in the liquid
argon gaps and high-voltage drop due to increased current drawn over the
current-limiting resistors. A proposed FCal replacement as a way to counter
some of these problems is weighed against the risks associated with the
replacement. To further mitigate the effects of increased pile-up, the
installation of a high-granularity timing detector at the front face of each
end-cap cryostat is also currently under consideration. Several different
sensor technologies and layouts are being investigated.Comment: 7 pages, 12 figures, Proceedings of the IEEE Nuclear Science
Symposium (NSS), Strasbourg, France, October 29 - November 5, 201
The Pope John Center: Labor, Delivery and the First Decade
Roll 26. Lodger's Caroling / Fr. Klubertanz. Image 1 of 7. (18 December, 1952; 22 December, 1952) [PHO 1.26.6]The Boleslaus Lukaszewski (Father Luke) Photographs contain more than 28,000 images of Saint Louis University people, activities, and events between 1951 and 1970. The photographs were taken by Boleslaus Lukaszewski (Father Luke), a Jesuit priest and member of the University's Philosophy Department faculty
On the Intracluster Medium in Cooling Flow & Non-Cooling Flow Clusters
Recent X-ray observations have highlighted clusters that lack entropy cores.
At first glance, these results appear to invalidate the preheated ICM models.
We show that a self-consistent preheating model, which factors in the effects
of radiative cooling, is in excellent agreement with the observations.
Moreover, the model naturally explains the intrinsic scatter in the L-T
relation, with ``cooling flow'' and ``non-cooling flow'' systems corresponding
to mildly and strongly preheated systems, respectively. We discuss why
preheating ought to be favoured over merging as a mechanism for the origin of
``non-cooling flow'' clusters.Comment: 4 pages, to appear in the proceedings of the "Multiwavelength
Cosmology" Conference held in Mykonos, Greece, June 2003, ed. M. Plionis
(Kluwer
Using Decision Trees for Coreference Resolution
This paper describes RESOLVE, a system that uses decision trees to learn how
to classify coreferent phrases in the domain of business joint ventures. An
experiment is presented in which the performance of RESOLVE is compared to the
performance of a manually engineered set of rules for the same task. The
results show that decision trees achieve higher performance than the rules in
two of three evaluation metrics developed for the coreference task. In addition
to achieving better performance than the rules, RESOLVE provides a framework
that facilitates the exploration of the types of knowledge that are useful for
solving the coreference problem.Comment: 6 pages; LaTeX source; 1 uuencoded compressed EPS file (separate);
uses ijcai95.sty, named.bst, epsf.tex; to appear in Proc. IJCAI '9
People with learning disabilities and mental health problems: the impact of ethnicity
There is increasing awareness of the needs of people with learning disabilities from different ethnic communities. This paper focuses on the impact of ethnicity on the presentation of mental health problems. The main aim of the paper is to inform those planning and delivering mental
health services for people with learning disabilities of the current evidence, in order to enable their practice to improve health outcomes for people from minority ethnic communitie
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