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Search Results: 1 - 10 of 224735 matches for " Randall R. Fransoo "
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Dementia and Depression with Ischemic Heart Disease: A Population-Based Longitudinal Study Comparing Interventional Approaches to Medical Management
W. Alan C. Mutch,Randall R. Fransoo,Barry I. Campbell,Dan G. Chateau,Monica Sirski,R. Keith Warrian
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0017457
Abstract: We compared the proportion of ischemic heart disease (IHD) patients newly diagnosed with dementia and depression across three treatment groups: percutaneous coronary intervention (PCI), coronary artery bypass grafting (CABG) and medical management alone (IHD-medical).
Heavy Quark Fragmentation into Heavy Mesons
R. L. Jaffe,L. Randall
Physics , 1993, DOI: 10.1016/0550-3213(94)90495-2
Abstract: We present a QCD based interpretation of heavy quark fragmentation which utilizes the heavy quark mass expansion. By distinguishing between perturbative and non-perturbative QCD effects, we show how to reliably extract mass independent parameters characterizing the fragmentation function. Because these parameters are quark mass independent, this procedure should permit tests of heavy quark symmetry. Furthermore, we show that heavy quark mass corrections vanish at order $m^2/Q^2$ in QCD. There also exist higher twist corrections of order $\Lambda m/Q^2$ and ${\alpha_{QCD}\over\pi} {m^2\over Q^2} \ln (Q^2/m^2)$ which we relate to the leading twist fragmentation function.
Matthew R. Buckley,Lisa Randall
Physics , 2010, DOI: 10.1007/JHEP09(2011)009
Abstract: We present a new paradigm for dark matter in which a dark matter asymmetry is established in the early universe that is then transferred to ordinary matter. We show this scenario can fit naturally into weak scale physics models, with a dark matter candidate mass of this order. We present several natural suppression mechanisms, including bleeding dark matter number density into lepton number, which occurs naturally in models with lepton-violating operators transferring the asymmetry.
On homeomorphic product measures on the Cantor set
Randall Dougherty,R. Daniel Mauldin
Mathematics , 2004,
Abstract: Let mu(r) be the Bernoulli measure on the Cantor space given as the infinite product of two-point measures with weights r and 1-r. It is a long-standing open problem to characterize those r and s such that mu(r) and mu(s) are topologically equivalent (i.e., there is a homeomorphism from the Cantor space to itself sending mu(r) to mu(s)). The (possibly) weaker property of mu(r) and mu(s) being continuously reducible to each other is equivalent to a property of r and s called binomial equivalence. In this paper we define an algebraic property called "refinability" and show that, if r and s are refinable and binomially equivalent, then mu(r) and mu(s) are topologically equivalent. We then give a class of examples of refinable numbers; in particular, the positive numbers r and s such that s=r^2 and r=1-s^2 are refinable, so the corresponding measures are topologically equivalent.
Nietzsche’s Best Life: The Ten Greatest Attributes of the Ubermensch, & a Comparison to Aristotle’s Virtuous Person  [PDF]
Randall Firestone
Open Journal of Philosophy (OJPP) , 2017, DOI: 10.4236/ojpp.2017.73020
Abstract: The paper first outlines the 10 primary attributes of the Ubermensch, Nie-tzsche’s ideal person, with numerous quotations. Those attributes are self-determination, creativity, becoming, overcoming, discontent, flexibility, self-mastery, self-confidence, cheerfulness, and courage. The paper then compares Nietzsche’s Ubermensch with Aristotle’s virtuous person. Nietzsche describes more of an attitude towards life and a process of living which are similar to a means as compared to Aristotle’s objective character traits which are goals or ends in themselves. The paper concludes that Nietzsche does a better job of describing the best human life—one that is dynamic, passionate, and unique; consisting of self-growth and creativity; and filled with new experiences, insights, and adventures.
River Cetaceans and Habitat Change: Generalist Resilience or Specialist Vulnerability?
Brian D. Smith,Randall R. Reeves
Journal of Marine Biology , 2012, DOI: 10.1155/2012/718935
Abstract: River dolphins are among the world’s most threatened mammals, and indeed the baiji (Lipotes vexillifer), a species endemic to China's Yangtze River, is likely extinct. Exploitation for products such as meat, oil, and skins has been a lesser feature in the population histories of river dolphins compared to most large mammals. Habitat factors are therefore of particular interest and concern. In this paper we attempt to describe the population-level responses of river dolphins to habitat transformation. We find circumstantial but compelling evidence supporting the view that, at a local scale, river dolphins are opportunists (generalists) capable of adapting to a wide range of habitat conditions while, at a river basin scale, they are more appropriately viewed as vulnerable specialists. The same evidence implies that the distributional responses of river dolphins to basinwide ecological change can be informative about their extinction risk, while their local behaviour patterns may provide important insights about critical ecological attributes. Empirical studies are needed on the ecology of river cetaceans, both to inform conservation efforts on behalf of these threatened animals and to help address broader concerns related to biodiversity conservation and the sustainability of human use in several of the world's largest river systems. 1. Introduction In this paper, we attempt to evaluate the ability of river dolphins to adapt to environmental change. This evaluation is necessarily speculative and largely theoretical. Our goal is to develop ideas and terminology that will facilitate a rigorous debate and stimulate field researchers and resource managers to look at these animals with fresh eyes. Our evaluation is far from academic because the fluvial systems occupied by dolphins have been and continue to be subjected to dramatic environmental changes associated with water development, a general decline in the availability and quality of fresh water, and global climate change. Regarding this last, although global warming will generally result in increased precipitation, the effects will be spatially and temporally uneven, and declines are expected in some areas [1]. Also, sea-level rise is expected to result in the loss of dolphin habitat in the lower reaches of rivers due to salinity encroachment and increased sedimentation [2]. The recent extinction of the Yangtze River dolphin or baiji Lipotes vexillifer [3] adds a sense of urgency for understanding the vulnerability and resilience of freshwater dolphins to environmental change. Although fishery
Influence Of Process Conditions On Melt Blown Web Structure. Part IV - Fiber Diameter
Randall R. Bresee,Uzair A. Qureshi
Journal of Engineered Fibers and Fabrics , 2006,
Abstract: We are continuing an effort to quantitatively measure the influence of processing variables on the structure of polypropylene melt blown webs. In this paper, we report experimental measurements of the influence of die-to-collector distance, primary airflow rate, die temperature, collector speed and resin throughput rate on the diameter of fibers in fully-formed webs. This enabled us to quantitatively compare the influence of these processing variables on fiber diameter as well as achieve greater understanding of the melt blowing process.
Solidification characteristics of atomized AlCu4Mg1-SiC composite powders
Yamanoglu R.,Zeren M.,German Randall M.
Journal of Mining and Metallurgy, Section B : Metallurgy , 2012, DOI: 10.2298/jmmb110717005y
Abstract: In this study, rapidly solidified metal matrix composite powders have been produced by PREP (Plasma rotating electrode process) atomization. AlCu4Mg1 alloy is used as the matrix material while SiC particles, with about 650 nm average particle size, are used as the reinforcement phase. The microstructural and solidification characteristics of composite particles are studied using optical and scanning electron microscope (SEM). The relationship between secondary dendrite arm spacing (SDAS) and particle diameter was examined, and these composite powders were found to have dendritic and equiaxed solidification with a fine eutectic phase. SDAS measurements using various sized particles show that secondary dendrite arm spacing slightly decreases with the decrease in particle size.
Longitudinal Analysis of Arterial Blood Pressure and Heart Rate Response to Acute Behavioral Stress in Rats with Type 1 Diabetes Mellitus and in Age-Matched Controls
David C. Randall,David R. Brown
Frontiers in Physiology , 2011, DOI: 10.3389/fphys.2011.00053
Abstract: We recorded via telemetry the arterial blood pressure (BP) and heart rate (HR) response to classical conditioning following the spontaneous onset of autoimmune diabetes in BBDP/Wor rats vs. age-matched, diabetes-resistant control (BBDR/Wor) rats. Our purpose was to evaluate the autonomic regulatory responses to an acute stress in a diabetic state of up to 12 months duration. The stress was a 15-s pulsed tone (CS+) followed by a 0.5-s tail shock. The initial, transient increase in BP (i.e., the “first component,” or C1), known to be derived from an orienting response and produced by a sympathetic increase in peripheral resistance, was similar in diabetic and control rats through ~9 months of diabetes; it was smaller in diabetic rats 10 months after diabetes onset. Weakening of the C1 BP increase in rats that were diabetic for >10 months is consistent with the effects of sympathetic neuropathy. A longer-latency, smaller, but sustained “second component” (C2) conditional increase in BP, that is acquired as a rat learns the association between CS+ and the shock, and which results from an increase in cardiac output, was smaller in the diabetic vs. control rats starting from the first month of diabetes. A concomitant HR slowing was also smaller in diabetic rats. The difference in the C2 BP increase, as observed already during the first month of diabetes, is probably secondary to the effects of hyperglycemia upon myocardial metabolism and contractile function, but it may also result from effects on cognition. The small HR slowing concomitant with the C2 pressor event is probably secondary to differences in baroreflex activation or function, though parasympathetic dysfunction may contribute later in the duration of diabetes. The nearly immediate deficit after disease onset in the C2 response indicates that diabetes alters BP and HR responses to external challenges prior to the development of structural changes in the vasculature or autonomic nerves.
Polymer Braids and Iterated Moire Maps
David R. Nelson,Randall D. Kamien
Physics , 1994,
Abstract: Crystalline order in dense packings of long polymers with a definite handedness is difficult to reconcile with the tendency of these chiral objects to twist and braid about each other. If the chirality is weak, the state of lowest energy is a triangular lattice of rigid rods. When the chirality is strong, however, screw dislocations proliferate, leading to either a tilt grain boundary phase or a new "moire state" with twisted bond order. In the latter case, polymer trajectories in the plane perpendicular to their average direction are described by iterated moir\'e maps of remarkable complexity, reminiscent of dynamical systems.
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