A5102987451- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Superconducting Materials and Applications
- Additive Manufacturing and 3D Printing Technologies
- Scientific Research and Discoveries
- Nuclear reactor physics and engineering
- 3D Modeling in Geospatial Applications
- Nuclear Materials and Properties
- Graphite, nuclear technology, radiation studies
- Solar and Space Plasma Dynamics
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- X-ray Diffraction in Crystallography
- Plasma Diagnostics and Applications
- Robotic Mechanisms and Dynamics
- Traumatic Brain Injury Research
- Thermography and Photoacoustic Techniques
- Ion-surface interactions and analysis
- Additive Manufacturing Materials and Processes
- Gamma-ray bursts and supernovae
- Advanced Antenna and Metasurface Technologies
- Data Visualization and Analytics
- Advanced ceramic materials synthesis
Oak Ridge National Laboratory
2006-2024
Target (United States)
2021-2024
University of Tennessee at Knoxville
2021
US Forest Service
2021
Purdue University West Lafayette
1981-1995
Complex collimator geometries are desired for custom neutron scattering applications. Boron carbide (B4C) is a suitable candidate material because its high boron content results in large neutron-absorbing cross section and it can be safely processed with powders subsequent melt infiltrations. High-density of carbide-aluminum metal matrix composites were fabricated using binder jet additive manufacturing followed by pressureless infiltration Al alloys. Infiltration three different alloys was...
Additive manufacturing techniques allow for the production of materials with complicated geometries reduced costs and time over traditional methods. We have applied this technique to neutron collimators use in thermal cold scattering instrumentation directly out boron carbide. discuss design generation these collimators. also provide measurements at beamlines which serve characterize performance parts using absorbing material may find applications radiography moderation.
A design for an incident-beam collimator the Paris–Edinburgh pressure cell is described here. This can be fabricated from reaction-bonded B4C but also through fast turnaround, inexpensive 3D-printing. 3D-printing thereby offers opportunity of composite collimators whereby tip closest to sample exhibit even better neutronic characteristics. Here, we characterize four such collimators: one B4C, 3D-printed and fully infiltrated with cyanoacrylate, a glue, glue-free tip, made enriched 10B4C. The...
This contribution describes the computational methodology behind an optimization procedure for a scattered beam collimator. The workflow includes producing file that can be manufactured via additive methods. A conical collimator, optimized neutron diffraction experiments in high pressure clamp cell, is presented as example. In such case scattering from sample much smaller than of cell. Monte Carlo Ray tracing MCViNE was used to model Si powder and collimator inserted into simulation number...
Forest Inventory and Analysis (FIA) data provides robust information for the United States Service’s (USFS) mid-to-broad-scale planning assessments, but ecological challenges (i.e., climate change, wildfire) necessitate increasingly strategic without significantly increasing field sampling. Small area estimation (SAE) techniques could provide more precision supported by a rapidly growing suite of landscape-scale datasets. We present three Regional case studies demonstrating current FIA uses,...
Abstract Domain composition, a recently described method for formulating continuum field problems, removes certain restrictions on the construction of finite element models such that it is possible to solve problem without using global compatible mesh. The domain composition couples or otherwise constrains meshes in local regions obtain solution equivalent produced by conventional methods. In particular, enables be formulated with overlapping elements. Several advantages come from this,...
Presented is a general method for solving sets of nonlinear constraints that include inequalities. Inequality are common in engineering design problems, such as kinematic synthesis. The proposed uses modified Newton’s and introduces slack variable constraint to convert each inequality into an equality constraint. Singular value decomposition used find the pseudo-inverse Jacobian at iteration. Benefits this scaling not issue often fails gracefully inconsistent by providing direction...
This sixth annual study of journal prices based on the Basic List Veterinary Serials, 2nd Edition, reports price index changes for 88 journals in veterinary medicine serials, 85 biomedical and life sciences, 23 relevant indexing abstracting journals. Two series are presented, one 1977, a second 1983, to approximate 1982-84 base federal consumer index. From 1977 through 1991 both core adjunct has risen 429.22 percentage points exactly parallel cost increases, these an average 23.52% each year...
Sincere thanks to the individuals who have served as reviewers for Neurology® Clinical Practice in 2016. The listed below with one asterisk reviewed 5 or more articles. Two asterisks indicate that reviewer has 10 manuscripts. This list includes those returned a review reviews of initial submissions (re-reviews same manuscript are not included).
We present a summary description of the 8th annual international Design and Engineering Neutron Instruments Meeting (DENIM) which was held in North Bethesda, MD, USA, September 17–19, 2019. DENIM VIII organized by National Institute Standards Technology (NIST) Center for Research (NCNR) combination with University Maryland (UMD). specifically addresses unique field neutron instrument engineering, subcategory scattering science. is engineers who share openly about what works doesn’t work life...