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Search Publications

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Displaying 4626 - 4650 of 74068

Blow-Down Calibration of a Large Ultrasonic Flow Meter

April 21, 2021
Author(s)
Aaron Johnson, Eric Harman, Joey Boyd
Oil and gas production industries use large (diameter > 0.8 m) ultrasonic flow meters (USMs) to measure exhaust gas from flare stacks, emissions from smokestacks, flow of natural gas, etc. Since most flow laboratories do not have compressors with

Cold Neutron Radiation Does Effects on a 6 LiF:ZnS(Ag) Neutron Detector with Wavelenght Shifting Fibers and SiPM Photodectector

April 21, 2021
Author(s)
Kevin NMN Pritchard, Daniel S. Hussey, A. Osovizky, Jeffrey B Ziegler, Louis Edward Binkley, Peter Tsai, Nancy Hadad, M. Jackson, C. Hurlbut, George M Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
A 6LiF:ZnS(Ag) based cold neutron detector with wavelength shifting (WLS) fibers and SiPM photodetector was developed at the NIST Center for Neutron Research for the CANDoR instrument (Chromatic Analysis Neutron Diffractometer or Reflectometer). To predict

Demonstration of focusing Wolter mirrors for neutron phase and magnetic imaging

April 21, 2021
Author(s)
Daniel S. Hussey, Han Wen, Huarui Wu, Thomas R. Gentile, Wangchun Chen, David L. Jacobson, Jacob LaManna, B. Khaykovich
Image-forming focusing mirrors were employed to demonstrate two different modalities of neutron imaging, phase imaging with a far-field interferometer, and magnetic-field imaging through the manipulation of the neutron beam polarization. For the phase

Demonstration of Small-Angle Neutron Scattering Measurements with a Nested Neutron-Focusing Supermirror Assembly

April 21, 2021
Author(s)
Huarui Wu, Zhiyuan Wang, Yao Zhang, Wenbo Mo, Pulin Bai, Kun Song, Zhong Zhang, Zhanshan Wang, Daniel S. Hussey, Yun Liu, Zhe Wang, Xuewu Wang
Neutron-focusing mirrors with both a nested structure and supermirror coatings enable a large collecting area, and consequently a large neutron current gain for mirror-based instruments. A nested neutron-focusing supermirror assembly has been fabricated

Design of a neutron microscope based on Wolter mirrors

April 21, 2021
Author(s)
Daniel S. Hussey, B. Khaykovich, Jeremy C. Cook, David L. Jacobson, Jacob LaManna, Kiranmayee Kilaru, Brian Ramsey, M. V. Gubarev
The predominate geometry for a neutron imaging experiment is that of a pinhole camera. This is primarily due to the difficulty in focusing neutrons due to the weak refractive index, which is also strongly chromatic. Proof of concept experiments

Effects of Cathode Corrosion on Through-Plane Water Transport in Proton Exchange Membrane Fuel Cells

April 21, 2021
Author(s)
Daniel S. Hussey, Joseph Fairweather, Dusan Spernjak, Adam Weber, David Harvey, Silvia Wessell, David L. Jacobson, Kateryna Artyushkova, Rangachary Mukundan, Rodney Borup
The corrosion of carbon in the electrode supports of proton-exchange-membrane fuel cells leads to electrode collapse, reduced active catalyst area, and increased surface hydrophilicity. While these effects have been linked to performance degradation over

Far-field interference of a neutron white beam and the applications to noninvasive phase-contrast imaging

April 21, 2021
Author(s)
Michael G. Huber, Daniel S. Hussey, Muhammad D. Arif, David L. Jacobson, Jacob LaManna, Wakana Ueno, Han Wen, Dmitry Pushin, Dusan Sarenac, David Cory, Houxun Miao, Takenao Shinohara, Joseph Parker
The phenomenon of interference plays a crucial role in the field of precision measurement science. Waveparticle duality has expanded the well-known interference effects of electromagnetic waves to massive particles. The majority of the wave-particle

High-resolution neutron depolarization microscopy of the ferromagnetic transitions inNi3Al and HgCr2Se4 under pressure

April 21, 2021
Author(s)
Daniel S. Hussey, Muhammad Abir, B. Khaykovich, C. Pfleiderer, Pau Jorba, Marc Seifert, Michael Schulz
We performed spatially resolved imaging of ferromagnetic transitions in Ni3Al and HgCr2Se4 crystals. These neutron depolarization measurements discovered bulk magnetic inhomogeneities in the ferromagnetic transition temperature with the spatial resolution

Multi-scale analyses of constituent phases in a trip-assisted duplex stainless steel by electron backscatter diffraction, in situ neutron diffraction, and energy selective neutron imaging

April 21, 2021
Author(s)
Daniel S. Hussey, Wanchuck Woo, Jongyul Kim
Micrometer to centimeter scale analyses of the crystalline phase volume fractions in a trip- assisted duplex stainless steel were performed as a function strain using electron backscatter diffraction (EBSD), in situ neutron diffraction, and energy

Neutron Imaging of Laser Melted SS316 Test Objects with Spatially Resolved Small Angle Neutron Scattering

April 21, 2021
Author(s)
Daniel S. Hussey, Adam J. Brooks, Caroline G. Lowery, Gerald L. Knapp, Bridget E. Cadigan, Shengmin Guo, Leslie G. Butler
A novel neutron far field interferometer is explored for sub-micron porosity detection in laser sintered SS316 test objects. The results shown are images and volumes of the first quantitative neutron dark-field tomography at various autocorrelation lengths

Predicting anomalous quantum confinement effect in van der Waals materials

April 21, 2021
Author(s)
Francesca Tavazza, Kamal Choudhary
Materials with van der Waals bonding are known to exhibit a quantum confinement effect, in which the electronic band gap of the three-dimensional realization of a material is lower than that of its two-dimensional (2D) counterpart. However, the possibility

Thermal And Visual Observation Of Water And Acetone Oscillating Heat Pipes

April 21, 2021
Author(s)
Daniel S. Hussey, David L. Jacobson, Hongbin Ma, R. A. Winholtz, Corey Wilson, Corey Borgmeyer
Identical oscillating heat pipes (OHP) charged separately with water and acetone were observed thermally and visually at varying condenser temperatures and heat inputs. Neutron radiography allowed visualization of hydrogen rich liquid water and acetone

Thick Sintered Electrode Lithium-Ion Battery Discharge Simulations: Incorporating Lithiation-Dependent Electronic Conductivity and Lithiation Gradient due to Charge Cycle

April 21, 2021
Author(s)
Daniel S. Hussey, Jacob LaManna, David L. Jacobson, Gary Koenig
In efforts to increase the energy density of lithium-ion batteries, researchers have attempted to both increase the thickness of battery electrodes and increase the relative fractions of active material. One system that has both of these attributes are

Three Phase-Grating Moire Neutron Interferometer for Large InterferometerArea Applications

April 21, 2021
Author(s)
Michael G. Huber, D. Sarenac, D. A. Pushin, Houxun Miao, Daniel S. Hussey, D G. Cory, Muhammad D. Arif, David L. Jacobson, Jacob LaManna, Ben Heacock
We demonstrate a three phase-grating neutron interferometer as a robust candidate for large area interferometry applications and characterization of materials. This novel far- eld moire technique allows for broad wavelength acceptance and relaxed
Displaying 4626 - 4650 of 74068