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Results: 898
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
The effect of boundary adaptivity on hexagonal ordering and bistability in circularly confined quasi hard discs
Ian Williams, Erdal C. Oǧuz, Robert L. Jack, Paul Bartlett, Harmut Löwen, C. Patrick Royall
Mar 14, 2014
The behaviour of materials under spatial confinement is sensitively dependent on the nature of the confining boundaries. In two dimensions, confinement within a hard circular boundary inhibits the hexagonal ordering observed in...
Multiple imputation of missing data in nested case-control and case-cohort studies.
The nested case-control and case-cohort designs are two main approaches for carrying out a substudy within a prospective cohort. This article adapts multiple imputation (MI) methods for handling missing covariates in full-cohort...
The effect of boundary adaptivity on hexagonal ordering and bistability in circularly confined quasi hard discs
Ian Williams, Erdal C. Oǧuz, Robert L. Jack, Paul Bartlett, Harmut Löwen, C. Patrick Royall
Mar 14, 2014
The behaviour of materials under spatial confinement is sensitively dependent on the nature of the confining boundaries. In two dimensions, confinement within a hard circular boundary inhibits the hexagonal ordering observed in...
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...
Covariate adjustment and estimation of mean response in randomised trials
Jonathan W Bartlett
Sep 01, 2018
Analyses of randomised trials are often based on regression models which adjust for baseline covariates, in addition to randomised group. Based on such models, one can obtain estimates of the marginal mean outcome for the...
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...
Virtual reality hip arthroscopy simulator demonstrates sufficient face validity.
PURPOSE: To test the face validity of the hip diagnostics module of a virtual reality hip arthroscopy simulator. METHODS: A total of 25 orthopaedic surgeons, 7 faculty members and 18 orthopaedic residents, performed diagnostic...
Does exercise attenuate age- and disease-associated dysfunction in unconventional T Cells? Shining a light on overlooked cells in exercise immunology
Unconventional T Cells (UTCs) are a unique population of immune cells that links innate and adaptive immunity. Following activation, UTCs contribute to a host of immunological activities, rapidly responding to microbial and...
Exercise training Gamma delta T cells MAIT cells NKT cells /dk/atira/pure/subjectarea/asjc/2700/2732 name=Orthopedics and Sports Medicine /dk/atira/pure/subjectarea/asjc/2700/2739 name=Public Health, Environmental and Occupational Health /dk/atira/pure/subjectarea/asjc/2700/2737 name=Physiology (medical) /dk/atira/pure/sustainabledevelopmentgoals/good_health_and_well_being name=SDG 3 - Good Health and Well-being
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