5,939 research outputs found
Direct jet reconstruction in p + p and Cu + Cu at PHENIX
The Relativistic Heavy Ion Collider collides heavy nuclei at
ultrarelativistic energies, creating a strongly interacting, partonic medium
that is opaque to the passage of high energy quarks and gluons. Direct jet
reconstruction applied to these collision systems provides a crucial constraint
on the mechanism for in-medium parton energy loss and jet-medium interactions.
However, traditional jet reconstruction algorithm operating in the large soft
background at RHIC give rise to fake jets well above the intrinsic production
rate of high-pT partons, impeding the detection of the low cross section jet
signal at RHIC energies. We developed a new jet reconstruction algorithm that
uses a Gaussian filter to locate and reconstruct the jet energy. This algorithm
is combined with a fake jet rejection scheme that provides efficient jet
reconstruction with acceptable fake rate in a background environment up to the
central Au + Au collision at sqrt(s_NN) = 200 GeV. We present results of its
application in p + p and Cu + Cu collisions using data from the PHENIX
detector, namely p + p cross section, Cu + Cu jet yields, the Cu + Cu nuclear
modification factor, and Cu + Cu jet-jet azimuthal correlation.Comment: To be published in the proceedings of DPF-2009, Detroit, MI, July
2009, eConf C09072
Cointegration Between Prices of Pecans and Other Edible Nuts: Forecasting and Implications
Crop Production/Industries, Demand and Price Analysis,
A GTD analysis of ogive pedestal
The metal ogive pedestal is claimed to have low radar cross section and low observability features. This study uses the Geometric Theory of Diffraction (GTD) to analyze the pedestal scattering for three cases: direct backscattered field, backscattered field structure, and target/pedestal multiple scattering. This study can be used to evaluate the various ways that the metal conical ogive pedestal can effect the performance of a high quality radar cross section measurement system
Estimating Property Values by Replication: An Alternative to the Traditional Grid and Regression Methods
This paper proposes and develops a replication method for estimating property values, in which optimal weights of comparable property attributes that best duplicate the subject property are determined. In a setting where the number of comparables is large compared to the number of attributes, replication weakly outperforms traditional general least squares regression by making use of potential correlations in the error structure. A similar result obtains in comparison to the grid method, which may suffer from subjective price adjustment factors. The replication method suggests using a large sample regression analysis to obtain the functional form of the error variance-covariance, and then replicating the subject with a smaller, attribute-close set of comparable properties.
Epidemic spreading induced by diversity of agents' mobility
In this paper, we study into the impact of the preference of an individual
for public transport on the spread of infectious disease, through a quantity
known as the public mobility. Our theoretical and numerical results based on a
constructed model reveal that if the average public mobility of the agents is
fixed, an increase in the diversity of the agents' public mobility reduces the
epidemic threshold, beyond which an enhancement in the rate of infection is
observed. Our findings provide an approach to improve the resistance of a
society against infectious disease, while preserving the utilization rate of
the public transportation system.Comment: 8 pages, 5 figure
BERLIN CONSUMER PREFERENCES FOR QUALITY ATTRIBUTES OF FRESH VEGETABLES
Consumer/Household Economics,
Consumer Willingness to Pay for Improved Attributes of Fresh Vegetables: A Comparison Between Atlanta and Berlin
Crop Production/Industries, Food Consumption/Nutrition/Food Safety,
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