1,217 research outputs found
Extending Continuum Models for Atom Probe Simulation
This work describes extensions to existing level-set algorithms developed for
application within the field of Atom Probe Tomography (APT). We present a new
simulation tool for the simulation of 3D tomographic volumes, using advanced
level set methods. By combining narrow-band, B-Tree and particle-tracing
approaches from level-set methods, we demonstrate a practical tool for
simulating shape changes to APT samples under applied electrostatic fields, in
three dimensions. This work builds upon our previous studies by allowing for
non-axially symmetric solutions, with minimal loss in computational speed,
whilst retaining numerical accuracy
The Value of Evidence-Based Computer Simulation of Oral Health Outcomes for Management Analysis of the Alaska Dental Health Aide Program
Objectives: To create an evidenceābased research tool to inform and guide policy and program
managers as they develop and deploy new service delivery models for oral disease prevention and
intervention.
Methods: A villageālevel discrete event simulation was developed to project outcomes
associated with different service delivery patterns. Evidenceā based outcomes were associated with
dental health aide activities, and projected indicators (DMFT, F+ST, Tāhealth, SiC, CPI, ECC) were proxy
for oral health outcomes. Model runs representing the planned program implementation, a more
intensive staffing scenario, and a more robust prevention scenario, generated 20āyear projections of
clinical indicators; graphs and tallies were analyzed for trends and differences.
Results: Outcomes associated with alternative patterns of service delivery indicate there is
potential for substantial improvement in clinical outcomes with modest program changes. Not all
segments of the population derive equal benefit when program variables are altered. Children benefit
more from increased prevention, while adults benefit more from intensive staffing.
Conclusions: Evidenceā based simulation is a useful tool to analyze the impact of changing
program variables on program outcome measures. This simulation informs dental managers of the
clinical outcomes associated with policy and service delivery variables. Simulation tools can assist public
health managers in analyzing and understanding the relationship between their policy decisions and
longāterm clinical outcomes.The Ford Foundation
An Analysis of Archival Observations Made of Galactic Supernova Remnants by the Chandra X-ray Observatory
Since its launch in 1999, the Chandra X-ray Observatory has spurred explosive growth in the study of Galactic supernova remnants (SNRs) due to its unsurpassed angular resolution (1 arcsecond at 1 keV) and its moderate sensitivity. We are currently analyzing archival observations made by Chandra of two particular classes of SNRs: mixed-morphology SNRs (which feature contrasting center-filled thermal X-ray morphologies with shell-like radio morphologies) and synchrotron X-ray SNRs (which feature X-ray spectra dominated by synchrotron emission). To illustrate some of our initial results, we present spatially resolved spectroscopic analyses of the mixed-morphology SNR 3C 397 and the synchrotron X-ray dominated SNR G353.6-0.7. In the former case, we have fit extracted spectra with a recombination-dominated thermal plasma model to determine the ionization state of the plasma associated with this SNR. In the latter case, we have fit extracted spectra with synchrotron models to determine the maximum energies of cosmic-ray electrons accelerated by the SNR
United States v. McIntosh: Ninth Circuit Limits Federal Prosecutors from Spending to Enforce Marijuana Laws in Medicinal States.
Abstract Forthcoming
United States v. McIntosh: Ninth Circuit Limits Federal Prosecutors from Spending to Enforce Marijuana Laws in Medicinal States.
Abstract Forthcoming
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