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Direct age constraints on the magnetism of Jack Hills zircon.
A potential record of Earth's magnetic field going back 4.2 billion years (Ga) ago is carried by magnetite inclusions in zircon grains from the Jack Hills. This magnetite may be secondary in nature, however, meaning that the...
Published by: Science advances
The Ursinus College Investment Management Company Newsletter, Fall 2023
Inside this issue: At a Glance Letter from Kaela Frenchman '24 and Olivia DeFusco '24 Letter from Jack Thompson '24 Honoring Dr. Scott Deacle and Investment Team Updates UCIMCO Investment Performance and Analysis Endowment...
Published by: Ursinus College
Chan-Vese Reformulation for Selective Image Segmentation.
Selective segmentation involves incorporating user input to partition an image into foreground and background, by discriminating between objects of a similar type. Typically, such methods involve introducing additional...
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Clinical and electrophysiological characterization of myokymia and neuromyotonia in Jack Russell Terriers.
BACKGROUND: Generalized myokymia and neuromyotonia (M/NM) in Jack Russell Terriers (JRTs) is related to peripheral nerve hyperexcitability syndrome in humans, a symptom complex resulting from diverse etiologies. OBJECTIVE...
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Preliminary data on oxytocin modulation of neural reactivity in women to emotional stimuli of children depending on childhood emotional neglect.
Sensitivity for rewarding cues and distress signals from children is fundamental to human caregiving and modulated by the neuropeptide oxytocin. In a functional magnetic resonance imaging study, we investigated whether oxytocin...
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Reevaluating the evidence for a Hadean-Eoarchean dynamo.
The time of origin of the geodynamo has important implications for the thermal evolution of the planetary interior and the habitability of early Earth. It has been proposed that detrital zircon grains from Jack Hills, Western...
Published by: Science advances
Associate Professor, P-12 Colleagues Nab S.C. Association of Teacher Educators Awards
Winthrop University
Jan 01, 0001
Sue Spencer won the Exemplary Service to the Teaching Profession Award from the South Carolina Association of Teacher Educators. Local teachers Jennifer Gaston and Adrian Deese won the Cooperating Teacher of the Year Awards.
Published by: Winthrop University
Phenotypic and Genotypic Models of Streptococcal Colonization of the Human Tonsil
Dennis J Spencer
Jan 01, 0001
Pharyngitis due to oropharyngeal infection with Streptococcus pyogenes is most commonly treated by using penicillin-derived antibiotics.While treatment failure in the 1950's was reported in 4-8% of children, more recent studies...
Published by: Rockefeller University
Ergodicity and large deviations in physical systems with stochastic dynamics
Robert L. Jack
Jun 06, 2020
Abstract: In ergodic physical systems, time-averaged quantities converge (for large times) to their ensemble-averaged values. Large deviation theory describes rare events where these time averages differ significantly from the...
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Random pinning in glassy spin models with plaquette interactions
Robert L Jack, L Berthier
Jan 01, 0001
We use a random pinning procedure to study amorphous order in two glassy spin models. On increasing the concentration of pinned spins at constant temperature, we find a sharp crossover (but no thermodynamic phase transition)...
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Investigating amorphous order in stable glasses by random pinning
C.J. Fullerton, R.L. Jack
Jun 27, 2014
We investigate stable glassy states that are found when glass-forming liquids are biased to lower than average dynamical activity. By pinning the positions of randomly chosen particles, we show that many-body correlations in...
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Dynamical phase transitions in supercooled liquids
C.J. Fullerton, R.L. Jack
Jun 14, 2013
We study dynamical phase transitions in a model supercooled liquid. These transitions occur in ensembles of trajectories that are biased towards low (or high) dynamical activity. We compare two different measures of activity...
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Phase transition for quenched coupled replicas in a plaquette spin model of glasses

We study a three-dimensional plaquette spin model whose low temperature dynamics is glassy, due to localized defects and effective kinetic constraints. The thermodynamics of this system is smooth at all temperatures. We show...

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Optimising self-assembly through time-dependent interactions
We demonstrate a simple method by which time-dependent interactions can be exploited to improve self-assembly in colloidal systems. We apply this method to two systems: a model colloid with a short-ranged attractive potential...
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Ergodicity and large deviations in physical systems with stochastic dynamics
RL Jack
Apr 22, 2021
Abstract In ergodic physical systems, time-averaged quantities converge (for large times) to their ensemble-averaged values. Large deviation theory...
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