A5038484603- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Groundwater and Isotope Geochemistry
- Dark Matter and Cosmic Phenomena
- Groundwater flow and contamination studies
- Heavy metals in environment
- Chromium effects and bioremediation
- Nuclear Materials and Properties
- Arsenic contamination and mitigation
- Soil and Unsaturated Flow
- Non-Destructive Testing Techniques
- Environmental remediation with nanomaterials
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Adsorption and biosorption for pollutant removal
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Hydraulic Fracturing and Reservoir Analysis
Oak Ridge National Laboratory
1999-2023
Stanford University
1999
The disposal of toxic metals [e.g., Cr(VI)] generated by the Department Energy during cold war era has historically involved shallow land burial in unconfined pits and trenches. objectives this study were to investigate impact coupled hydrologic geochemical processes on fate transport Cr(VI) undisturbed soil cores obtained from a fractured, acidic inceptisol that are commonly used waste at Oak Ridge National Laboratory. mobility was significantly retarded relative nonreactive Br- tracer,...
A significant limitation in defining remediation needs at contaminated sites often results from an insufficient understanding of the transport processes that control contaminant migration. The objectives this research were to help resolve dilemma by providing improved highly structured, heterogeneous subsurface environments are complicated fracture flow and matrix diffusion. Our approach involved a unique long‐term, steady state natural gradient injection multiple tracers with different...
This paper describes the hardware and software upgrades, operation, performance of high intensity diffractometer for residual stress analysis (HIDRA) instrument, a mapping neutron located at High Flux Isotope Reactor Oak Ridge National Laboratory in Tennessee, USA. Following major upgrade 2018, new instrument has single 3He multiwire 2D 30 × cm2 position sensitive detector, yielding field view 17° 2θ. The increase (from 4° 2θ) from previous model contributed to tremendous improvement out...
Chromium has served as an exceptional and necessary elemental component of many industrial processes consumer products. Its prevalence in the global environment both a dissolved wind‐borne constituent prompted concern during last several decades due to large migration potential biological toxicity various Cr chemical species. The objective this study was develop improved understanding predictive capability rates mechanisms competing geochemical redox sorption reactions that govern fate...
The possibility of relatively fast neutron oscillations into a mirror state is not excluded experimentally when magnetic field considered. Direct searches for the disappearance neutrons in controlled have previously been performed using ultracold neutrons, with some anomalous results reported. We describe technique cold to perform and regeneration search, which would allow us unambiguously identify possible oscillation signal. An experiment existing General Purpose-Small Angle Neutron...
The Oak Ridge National Laboratory Neutron Sciences Directorate (NScD) has recently installed a neutron imaging beamline at the High Flux Isotope Reactor (HFIR) cold guide hall. CG-1D supports broad range of user research spanning from engineering to material research, energy storage, additive manufacturing, vehicle technologies, archaeology, biology, and plant physiology. performance (spatial resolution, field view, etc.) its utilization for biological are presented. NScD is also considering...
The theory of mirror matter predicts a hidden sector made up copy the Standard Model particles and interactions but with opposite parity. If interacts ordinary matter, there could be experimentally accessible implications in form neutral particle oscillations. Direct searches for neutron oscillations into neutrons controlled magnetic field have previously been performed using ultracold storage/disappearance measurements, some inconclusive results consistent characteristic oscillation time...
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