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Search Results: 1 - 10 of 461819 matches for " A. Bean "
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An isoperimetric inequality related to Thue's equation
Michael A. Bean
Mathematics , 1994,
Abstract: This paper announces the discovery of an isoperimetric inequality for the area of plane regions defined by binary forms. This result has been applied subsequently in the enumeration of solutions to the Thue inequality and, given its fundamental nature, may find application in other areas as well.
Effects of Illness Severity and Alcohol Use on Cognition in End Stage Liver Disease after Controlling for General Intelligence and Mood——Cognition in End Stage Liver Disease  [PDF]
Robert P. Hart, Douglas P. Gibson, Melanie K. Bean, Robert A. Fisher
International Journal of Clinical Medicine (IJCM) , 2012, DOI: 10.4236/ijcm.2012.32025
Abstract: Background: While neuropsychological deficits are common in patients with end stage liver disease (ESLD) evaluated for transplantation, the determinant factors are not clear. Methods: Towards that end, we examined data from 108 patients who completed neuropsychological tests as part of their liver transplantation evaluation. First, controlling for estimated premorbid ability and mood, multiple regression analyses were used to examine the effects of illness severity on cognition. Second, we compared neuropsychological functioning of patients with vs. without a history of excessive alcohol use, independent of primary liver disease diagnosis. Results: Severity of illness was associated with the extent of psychomotor slowing. Excessive alcohol use was associated with lower scores on tests of memory. Furthermore, worse memory was not explained by lower estimated premorbid ability, lower concurrently measured general intelligence, or greater illness severity. Conclusions: Our findings illustrate the importance of controlling for estimated premorbid ability in assessing the effect of illness variables on cognition. Another implication is that measures of psychomotor speed are important in assessing cognition in patients with ESLD, and especially for patients with a history of excessive alcohol use, a broader range of domains, including memory, should be examined.
The Mating Behavior of Drosophila Mojavensis on Organ Pipe and Agria Cactus
Robert A. Krebs,Karen L. Bean
Psyche , 1991, DOI: 10.1155/1991/49063
Development of Ultra-High-Density Screening Tools for Microbial “Omics”
Gordon J. Bean, Philipp A. Jaeger, Sondra Bahr, Trey Ideker
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0085177
Abstract: High-throughput genetic screens in model microbial organisms are a primary means of interrogating biological systems. In numerous cases, such screens have identified the genes that underlie a particular phenotype or a set of gene-gene, gene-environment or protein-protein interactions, which are then used to construct highly informative network maps for biological research. However, the potential test space of genes, proteins, or interactions is typically much larger than current screening systems can address. To push the limits of screening technology, we developed an ultra-high-density, 6144-colony arraying system and analysis toolbox. Using budding yeast as a benchmark, we find that these tools boost genetic screening throughput 4-fold and yield significant cost and time reductions at quality levels equal to or better than current methods. Thus, the new ultra-high-density screening tools enable researchers to significantly increase the size and scope of their genetic screens.
The Quest for the Sun's Siblings: an Exploratory Search in the Hipparcos Catalogue
Anthony G. A. Brown,Simon F. Portegies Zwart,Jennifer Bean
Physics , 2010, DOI: 10.1111/j.1365-2966.2010.16921.x
Abstract: We describe the results of a search for the remnants of the Sun's birth cluster among stars in the Hipparcos Catalogue. This search is based on the predicted phase space distribution of the Sun's siblings from simple simulations of the orbits of the cluster stars in a smooth Galactic potential. For stars within 100 pc the simulations show that it is interesting to examine those that have small space motions relative to the Sun. From amongst the candidate siblings thus selected there are six stars with ages consistent with that of the Sun. Considering their radial velocities and abundances only one potential candidate, HIP 21158, remains but essentially the result of the search is negative. This is consistent with predictions by Portegies Zwart (2009) on the number of siblings near the Sun. We discuss the steps that should be taken in anticipation of the data from the Gaia mission in order to conduct fruitful searches for the Sun's siblings in the future.
Editorial Introduction – Moving Forward
Carol Bean
Code4Lib Journal , 2010,
Abstract: Welcoming new editors, and reflecting on the sustainability factor.
Editorial Introduction
Carol Bean
Code4Lib Journal , 2012,
Abstract: The winter months bring us festivities like Mardi Gras. Here at the Code4Lib Journal, we present you with a veritable feast to indulge in as our mid-winter festival offering. Consume slowly, to fully appreciate the myriad flavors and enjoy the richness of the fare.
TASI Lectures on Cosmic Acceleration
Rachel Bean
Physics , 2010,
Abstract: In this series of lectures we review observational evidence for, and theoretical investigations into, cosmic acceleration and dark energy. The notes are in four sections. First I review the basic cosmological formalism to describe the expansion history of the universe and how distance measures are defined. The second section covers the evidence for cosmic acceleration from cosmic distance measurements. Section 3 discusses the theoretical avenues being considered to explain the cosmological observations and section 4 discusses how the growth of inhomogeneities and large scale structure observations might help us pin down the theoretical origin of cosmic acceleration.
A weak lensing detection of a deviation from General Relativity on cosmic scales
Rachel Bean
Physics , 2009,
Abstract: We consider evidence for deviations from General Relativity (GR) in the growth of large scale structure, using two parameters, $\gamma$ and $\eta$, to quantify the modification. We consider the Integrated Sachs-Wolfe effect (ISW) in the WMAP Cosmic Microwave Background data, the cross-correlation between the ISW and galaxy distributions from 2MASS and SDSS surveys, and the weak lensing shear field from the Hubble Space Telescope's COSMOS survey along with measurements of the cosmic expansion history. We find current data, driven by the COSMOS weak lensing measurements, disfavors GR on cosmic scales, preferring $\eta<1$ at $1
Perturbation evolution with a non-minimally coupled scalar field
Rachel Bean
Physics , 2001, DOI: 10.1103/PhysRevD.64.123516
Abstract: We recently proposed a simple dilaton-derived quintessence model in which the scalar field was non-minimally coupled to cold dark matter, but not to `visible' matter. Such couplings can be attributed to the dilaton in the low energy limit of string theory, beyond tree level. In this paper we discuss the implications of such a model on structure formation, looking at its impact on matter perturbations and CMB anisotropies. We find that the model only deviates from $\Lambda$CDM and minimally coupled theories at late times, and is well fitted to current observational data. The signature left by the coupling, when it breaks degeneracy at late times, presents a valuable opportunity to constrain non-minimal couplings given the wealth of new observational data promised in the near future.
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