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Results: 765
Direct age constraints on the magnetism of Jack Hills zircon.
Richard J M Taylor, Steven M Reddy, David W Saxey, William D A Rickard, Fengzai Tang, Cauê S Borlina, Roger R Fu, Benjamin P Weiss, Paul Bagot, Helen M Williams, Richard J Harrison
Feb 09, 2023
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...
UCIMCO Endowment portfolio management stock selection Investment performance Ursinus College Business Finance and Financial Management Portfolio and Security Analysis
Published by: Ursinus College
High-temperature phase transitions in dense germanium.
Liam C Kelsall, Miriam Peña-Alvarez, Miguel Martinez-Canales, Jack Binns, Chris J Pickard, Philip Dalladay-Simpson, Ross T Howie, Eugene Gregoryanz
Apr 08, 2021
Through a series of high-pressure x-ray diffraction experiments combined with in situ laser heating, we explore the pressure-temperature phase diagram of germanium (Ge) at pressures up to 110 GPa and temperatures exceeding 3000...
Synthesis of Weaire-Phelan Barium Polyhydride.
Miriam Peña-Alvarez, Jack Binns, Miguel Martinez-Canales, Bartomeu Monserrat, Graeme J Ackland, Philip Dalladay-Simpson, Ross T Howie, Chris J Pickard, Eugene Gregoryanz
Apr 21, 2021
By combining pressures up to 50 GPa and temperatures of 1200 K, we synthesize the novel barium hydride, Ba8H46, stable down to 27 GPa. We use Raman spectroscopy, X-ray diffraction, and first-principles calculations to determine...
Monasticism—Then and Now
The monastic tradition has its roots in the New Testament practices of withdrawing into the desert, following a celibate lifestyle and disciplines of fasting. After the empire became Christian in the 4th century these...
John Binns
Jul 28, 2021
Clinical and electrophysiological characterization of myokymia and neuromyotonia in Jack Russell Terriers.
AE Vanhaesebrouck, I Van Soens, L Poncelet, L Duchateau, S Bhatti, I Polis, S Diels, L Van Ham
Jul 03, 2019
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...
Reevaluating the evidence for a Hadean-Eoarchean dynamo.
Cauê S Borlina, Benjamin P Weiss, Eduardo A Lima, Fengzai Tang, Richard J M Taylor, Joshua F Einsle, Richard J Harrison, Roger R Fu, Elizabeth A Bell, Ellen W Alexander, Heather M Kirkpatrick, Matthew M Wielicki, T Mark Harrison, Jahandar Ramezani, Adam C Maloof
May 16, 2020
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
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...
Dynamical phase transitions in supercooled liquids
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...
Investigating amorphous order in stable glasses by random pinning
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...
Random pinning in glassy spin models with plaquette interactions
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)...
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...
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...
Ergodicity and large deviations in physical systems with stochastic dynamics
Abstract
In ergodic physical systems, time-averaged quantities converge (for large times) to their ensemble-averaged values. Large deviation theory...
RL Jack
Apr 22, 2021
Ergodicity and large deviations in physical systems with stochastic dynamics
Robert L. Jack
Jul 14, 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...
Large deviations in models of growing clusters with symmetry-breaking transitions.
Robert L Jack
Sep 03, 2019
We analyze large deviations of the magnetization in two models of growing clusters. The models have symmetry-breaking transitions, so the typical magnetization of a growing cluster may be either positive or negative, with equal...
Tracer dynamics in one dimensional gases of active or passive particles
Abstract
We consider one-dimensional systems comprising either active run-and-tumble particles (RTPs) or passive Brownian random walkers. These particles are either noninteracting...
Effective induction therapy for anti-SRP associated myositis in childhood
E L Binns, Elena Moraitis, S Maillard, S Tansley, N McHugh, Thomas S Jacques, L R Wedderburn, Clarissa Pilkington, S A Yasin, Kiran Nistala
Oct 31, 2017
BACKGROUND: Anti-Signal Recognition Particle associated myopathy is a clinically and histopathologically distinct subgroup of Juvenile Idiopathic Inflammatory Myositis, which is under-recognised in children and fails to...
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...
Effective interactions and large deviations in stochastic processes
We discuss the relationships between large deviations in stochastic systems, and “effective interactions” that induce particular rare events. We focus on the nature of these effective interactions in physical systems with...
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