2,838 research outputs found
Naturalism and Religious Experience
No full textDrees examines a science-inspired naturalism that endorses a fully naturalistic view of reality, but does not exclude religious experience as a category of human experience. He considers some exceptional experiences that apparently conflict with natural events and experiences that coincide with affective responses, such as awe and wonder, proposing that the relevant exceptional experiences and affective experiences are explainable, at least in principle, within a naturalistic purview
Enhanced strange particle yields : signal of a phase of massless particles?
No full textThe yields of strange particles are calculated with the UrQMD model for p,Pb(158 AGeV)Pb collisions and compared to experimental data. The yields are enhanced in central collisions if compared to proton induced or peripheral Pb+Pb collisions. The enhancement is due to secondary interactions. Nevertheless, only a reduction of the quark masses or equivalently an increase of the string tension provides an adequate description of the large observed enhancement factors (WA97 and NA49). Furthermore, the yields of unstable strange resonances as the Lambda star(1520) resonance or the phi meson are considerably affected by hadronic rescattering of the decay products
A Search for Charm and Beauty in a Very Strange World
No full text201 pg.The Relativistic
Heavy Ion Collider (RHIC) was built to produce and study the extremely hot and dense phase of matter called Quark
Gluon Plasma (QGP) in which the degrees of freedom are individual partons rather than composite hadrons. Since 2000,
RHIC has collided various species of particles in order to disentangle and isolate the properties of the strongly
interacting QGP: p+p to set a baseline, d+Au to establish a control experiment, Au+Au to definitively create the QGP,
and Cu+Cu to bridge the gap between d+Au and Au+Au. Electron-positron pairs are a particularly effective probe of
the QGP because they carry no color charge. Therefore, once created, these leptons do not interact strongly with the
medium. As a result, they retain characteristics of the full time evolution and dynamics of the system. There are
many features of interest in the dielectron invariant mass spectrum. The low mass region (m<1 GeV/c2) consists
primarily of pairs from Dalitz decays of light hadrons and direct decays of vector mesons that can be modified by the
medium, while the intermediate (1<m<3 GeV/c2) and high (4<m<8 GeV/c2) mass regions are dominated by pairs
from mesons containing charm and beauty respectively. Of the multitude of measurements that PHENIX has produced over
the last decade, one of the more mysterious and intriguing is a large enhancement of pairs in the low mass region in
central Au+Au collisions compared to the p+p reference. Current theories are unable to explain the origin of this
excess and a lingering question within the field is whether the presence of 'cold' nuclear matter in the
initial state of the collision, independent of the formation of a QGP, could possibly account for this increased
yield. To answer this question, this thesis explores the dielectron spectra in d+Au collisions at √sNN
=200GeV. The d+Au system contains the cold nuclear matter in question but cannot create the required energy density
to form a QGP, making it an ideal place to explore these effects. In addition, the 2008 d+Au dataset contains the
necessary luminosity to also dissect the high mass region of the spectrum, thereby illuminating the characteristics
of heavy flavor production. These include measuring the production cross sections for charm and beauty (Σcc,
Σbb) as well as testing the validity of next-to-leading order
perturbative Quantum Chromodynamics (NLO pQCD).Advisor(s): Hemmick, Thomas K; Drees, Axel. Committee Member(s): Zahed,
Ismail ; Weinacht, Thomas ; Woody, Craig.Stony
Brook University Libraries. SBU Graduate School in Department of Physics. Charles Taber (Dean of Graduate
School)
Supersymmetric Higgs boson pair production: discovery prospects at hadron colliders
No full textWe study the potential of hadron colliders in the search for the pair production of neutral Higgs bosons in the framework of the minimal supersymmetric standard model. We perform a detailed signal and background analysis, working out efficient kinematical cuts for the extraction of the signal. The important role of squark loop contributions to the signal is re-emphasized. If the signal is sufficiently enhanced by these contributions, it could even be observable at the next run of the upgraded Tevatron collider in the near future. At the LHC the pair production of light and heavy Higgs bosons might be detectable simultaneously
Naturalism and Religious Experience
No full textDrees examines a science-inspired naturalism that endorses a fully naturalistic view of reality, but does not exclude religious experience as a category of human experience. He considers some exceptional experiences that apparently conflict with natural events and experiences that coincide with affective responses, such as awe and wonder, proposing that the relevant exceptional experiences and affective experiences are explainable, at least in principle, within a naturalistic purview
R.-L. Baum, K. Boisserée, L.-B. Campbell, C.-A. Colliard, M. Colombini, R. Keles, A. Lopatka, L. Lustacz, F. Meijer-Drees, C.-A. Petri, M. Prieur, H, Van Impe. La pollution atmosphérique en droit français et en droit comparé , 1976
No full textLambrechts Claude. R.-L. Baum, K. Boisserée, L.-B. Campbell, C.-A. Colliard, M. Colombini, R. Keles, A. Lopatka, L. Lustacz, F. Meijer-Drees, C.-A. Petri, M. Prieur, H, Van Impe. La pollution atmosphérique en droit français et en droit comparé , 1976. In: Revue Juridique de l'Environnement, n°1, 1977. pp. 105-106
Goodness-of-fit tests for a heavy tailed distribution
No full textFor testing whether a distribution function is heavy tailed, we study theKolmogorov test, Berk-Jones test, score test and their integratedversions. A comparison is conducted via Bahadur efficiency and simulations.The score test and the integrated score test show the best performance.Although the Berk-Jones test is more powerful than the Kolmogorov-Smirnovtest, this does not hold true for their integrated versions; this differsfrom results in \\citet{EinmahlMckeague2003}, which shows the difference ofBerk-Jones test in testing distributions and tails.Bahadur efficiency;heavy tail;tail index
Using mixed integer programming to schedule experiments on the Texas A&M University nuclear science center reactor
No full textDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to [email protected], referencing the URI of the item.Includes bibliographical references (leaves 54-55).The NSC scheduling problem involves a two-station graphics. bowshot. Several practical aspects prevent it from conforming to existing models in the literature. Some jobs may be preempted, while others may not. Some jobs have deadlines, while others have only due-dates. Some jobs require tooling, while others do not. This problem is modeled as a time-indexed Mixed Integer Program. Constraints were formed and variables were defined in such a way to minimize-to the fullest extent possible-the number of integer variables in the problem. The objective is to minimize the total weighted tardiness of the jobs with due-dates. Deadlines must be observed as constraints. We developed four optimizing strategies and one heuristic and tested them to determine their effectiveness in solving the NSC scheduling problem. One optimizing strategy exploits the Multiple Choice Sets structure within the constraints. The other three optimizing strategies deal with various ways of prioritizing the variables to bias the branch-and-bound search. The higher the priority, the earlier the search branches on that variable. The heuristic starts with the solution to the LP relaxation and fixes all binary variables to 1 that are greater than or equal to some variable k, which is between 0 and 1. These optimizing strategies and the heuristic were tested on 25 test problems, each of which represented a ten-job scheduling problem. The parameters for the jobs were taken from a database of 103 jobs that were processed by the Nuclear Science Center in early 1997. A11 optimizing strategies and the heuristic were tested using CPLEX 6.0. The results of these tests were compared with the CPLEX default settings for solving MIPs. One particular optimizing strategy worked especially well in terms of the number of test problems solved to optimality and the run-time. This "skip-factor'' strategy prioritized variables in such a way that some tardiness is allowed initially in order to arrive at an initial feasible solution quickly. This strategy optimized 80% of the test problems within a predetermined time limit (the highest of all strategies tested) and did so with an average run-time of less than one minute
On the Maximum Likelihood Estimation of Extreme Value Index Based on k-Record Values
No full textIn this paper, we study the existence and consistency of the maximum likelihood estimator of the extreme value index based on k-record values. Following the method used by Drees et al. (2004) and Zhou (2009), we prove that the likelihood equations, in terms of k-record values, eventually admit a strongly consistent solution without any restriction on the extreme value index, which is not the case in the aforementioned studies
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