Andrew Nelson

ORCID: 0000-0002-4071-3502
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About
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Research Areas
  • Nuclear Materials and Properties
  • Nuclear reactor physics and engineering
  • Radioactive element chemistry and processing
  • Fusion materials and technologies
  • Astro and Planetary Science
  • Embedded Systems Design Techniques
  • Nuclear materials and radiation effects
  • Astrophysics and Star Formation Studies
  • Real-Time Systems Scheduling
  • Nuclear and radioactivity studies
  • Parallel Computing and Optimization Techniques
  • Stellar, planetary, and galactic studies
  • Advanced materials and composites
  • Interconnection Networks and Systems
  • Crystallization and Solubility Studies
  • X-ray Diffraction in Crystallography
  • Nuclear Engineering Thermal-Hydraulics
  • Additive Manufacturing Materials and Processes
  • Primary Care and Health Outcomes
  • Nuclear Physics and Applications
  • Thermal and Kinetic Analysis
  • Additive Manufacturing and 3D Printing Technologies
  • Advanced ceramic materials synthesis
  • Health Systems, Economic Evaluations, Quality of Life
  • Healthcare Policy and Management

Oak Ridge National Laboratory
2007-2024

Eindhoven University of Technology
2014-2024

Government of the United States of America
2022-2024

Uniformed Services University of the Health Sciences
2023-2024

Microsoft Research (United Kingdom)
2021-2023

University of Tennessee at Knoxville
2022

The Ohio State University
2022

SLAC National Accelerator Laboratory
2022

Menlo School
2022

Los Alamos National Laboratory
2012-2022

10.1016/j.jnucmat.2007.05.005 article EN Journal of Nuclear Materials 2007-05-11

We find a linear instability of nonaxisymmetric Rossby waves in thin nonmagnetized Keplerian disk when there is local maximum the radial profile key function (r)≡(r)S2/Γ(r), where −1=·(∇×v)/Σ potential vorticity, S=P/ΣΓ entropy, Σ surface mass density, P vertically integrated pressure, and Γ adiabatic index. consider detail special case entropy S(r). This acts to trap its vicinity if height-to-width ratio max(S)/Δr larger than threshold value. The pressure gradient derived from this...

10.1086/306900 article EN The Astrophysical Journal 1999-03-10

<h3>Background</h3> More than 50% of the elderly population has not received pneumococcal vaccination. Uncertainty regarding benefits immunization, particularly for noninvasive disease, may contribute to underuse vaccine. <h3>Objective</h3> To assess health and economic associated with <h3>Methods</h3> We conducted a 2-year retrospective cohort study among all members staff-model managed care organization who had baseline diagnosis chronic lung disease. The outcomes were assessed over 2...

10.1001/archinte.159.20.2437 article EN Archives of Internal Medicine 1999-11-08

We show that planet formation via both gravitational collapse and core accretion is unlikely to occur in equal mass binary systems with moderate (~ 50 AU) semi-major axes. Internal thermal energy generation the disks sufficient heat gas everywhere so spiral structures quickly decay rather than grow or fragment. This same heating will inhibit dust coagulation because temperatures rise above vaporization of many volatile materials. consider other processes not included model conclude our are...

10.1086/312752 article EN The Astrophysical Journal 2000-07-01

(highly abridged) We define three requirements for accurate simulations that attempt to model circumstellar disks and the formation of collapsed objects (e.g. planets) within them. First, we a resolution requirement based on wavelength neutral stability self gravitating waves in disk. For particle or grid simulations, this criterion takes form, respectively, minimum number particles per critical (`Toomre') mass maximum value `Toomre number', $T= δx/λ_T$, where wavelength, $λ_T$, is disks....

10.1111/j.1365-2966.2006.11119.x article EN Monthly Notices of the Royal Astronomical Society 2006-11-08

Systems on chip (SOC) contain multiple concurrent applications with different time criticality (firm, soft, non real-time). As a result, they are often developed by teams or companies, models of computation (MOC) such as dataflow, Kahn process networks (KPN), time-triggered (TT). SOC functionality and (real-time) performance is verified after all have been integrated. In this paper we propose the CompSOC platform design flows that offers virtual execution per application, to allow...

10.1145/2544350.2544353 article EN ACM SIGBED Review 2013-10-01

The behavior of uranium in environments, ranging from those natural systems responsible for the formation deposits to nuclear reactors providing 11% world's electricity, is governed by processes involving high-temperature aqueous solutions. It has been well documented that mobile solutions its oxidized, U6+ state, whereas reduced, U4+ assumed be immobile. Here, we present experimental evidence high temperature (>100 °C) acidic brines invalidates this assumption. Our experiments have...

10.1038/s41467-018-03564-7 article EN cc-by Nature Communications 2018-04-11

The Kaiser Permanente & Strategic Partners Patient Outcomes Research To Advance Learning (PORTAL) network engages four healthcare delivery systems (Kaiser Permanente, Group Health Cooperative, HealthPartners, and Denver Health) their affiliated research centers to create a new national infrastructure that builds on existing relationships among these institutions. PORTAL is enhancing its current capabilities by expanding the scope of common data model, paying particular attention...

10.1136/amiajnl-2014-002746 article EN cc-by-nc Journal of the American Medical Informatics Association 2014-05-13

The thermal conductivity of stoichiometric CeO 2 was determined through measurement expansion from 313 to 1723 K, diffusivity 298 1473 and specific heat capacity 1373 K. then calculated as the product density, diffusivity, capacity. found obey an ( A + BT ) −1 relationship with = 6.776×10 −2 m·K·W B 2.793 × 10 −4 m·W . Extrapolations applied models were made provide suggested data for capacity, up Results measurements agreed well limited low‐temperature available in literature. values...

10.1111/jace.13170 article EN Journal of the American Ceramic Society 2014-08-07

10.1016/j.jnucmat.2016.12.016 article EN publisher-specific-oa Journal of Nuclear Materials 2016-12-18

Abstract The thermal and mechanical properties of cerium dioxide (CeO 2 ) were assessed using a range experimental techniques. oxygen potential CeO was measured by the thermogravimetric technique, numerical fit for is derived based on defect chemistry. Mechanical obtained sound velocity measurement, resonant ultrasound spectroscopy nanoindentation. are then used to evaluate Debye temperature Grüneisen constant. heat capacity conductivity also calculated Finally, upon laser flash analysis...

10.1111/jace.16055 article EN publisher-specific-oa Journal of the American Ceramic Society 2018-09-06

Tears of the meniscus are among most commonly diagnosed knee injuries. Because lacks ability to self-heal due its low vascularity, surgical intervention is needed in more than 85% cases. Tissue-engineered meniscal implants may provide a treatment strategy that better supports healing and long-term health mobility benefits. We used three-dimensional printing develop "universal" human tissue repair device can be trimmed match corresponding area damage debrided during patient's repair. Computer...

10.1016/j.bprint.2023.e00272 article EN cc-by-nc-nd Bioprinting 2023-04-03

10.1016/j.jnucmat.2013.07.063 article EN Journal of Nuclear Materials 2013-08-06

Nickel ferrite (NiFe 2 O 4 ) is a major constituent of the corrosion deposits formed on exterior nuclear fuel cladding tubes during operation. NiFe has attracted much recent interest, mainly due to impact these deposits, known as CRUD, operation commercial reactors. Although advances have been made in modeling CRUD nucleation and growth under wide range conditions, thermophysical properties at high temperatures only approximated, thereby limiting accuracy such models. In this study, samples...

10.1111/jace.12901 article EN Journal of the American Ceramic Society 2014-04-01
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