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Search Publications

NIST Authors in Bold

Displaying 101 - 125 of 3755

Ion-Molecule Reactions and Ion Kinetics in DC Townsend Discharges in Dielectric Gases

January 1, 1999
Author(s)
MVVS. Rao, James K. Olthoff
… and kinetic energies of ions are determined by ion-molecule collisions experienced by ions as they are … as charge-exchange collisions, collisional detachment, and ion conversion, we have measured the kinetic-energy … measurements, and the effective cross sections for the ion-molecule reactions, in some cases, may be calculated. The …

Fundamental Equations of State for Parahydrogen, Normal Hydrogen, and Orthohydrogen

September 4, 2009
Author(s)
Jacob W. Leachman, Bryce Jacobson, Steven Penoncello, Eric Lemmon
… If the potential for a boom in the global hydrogen economy is realized, there will be an increase in the need for accurate hydrogen thermodynamic property standards. Based on current … fundamental equations of state for parahydrogen, normal hydrogen, and orthohydrogen were developed to replace the …

Evidence of Molecular Hydrogen Trapped in Two-Dimensional Layered Titanium Carbide-Based MXene

July 17, 2017
Author(s)
Naresh C. Osti, Michael Naguib, Madhu Sudan Tyagi, Yury Gogotsi, Alexander I. Kolesnikov, Eugene Mamontov
… The presence of molecular hydrogen at ambient conditions in a MXene (Ti 3 C 2 T x )) … meV, providing a clear indication of the presence of para hydrogen in the MXene synthesized using 48% HF and annealed … the peak width due to the mobility of the molecular hydrogen in confinement. The presence of molecular hydrogen …

A Clock Ensemble Using Only Active Hydrogen Masers

January 31, 2017
Author(s)
Thomas E. Parker, Stefania Romisch
… as well as the post-processed scale TP162, both contain hydrogen masers and commercial cesium frequency standards. … standards are much nosier in the short term than the hydrogen masers and consequently have very little short-term … on the clock ensemble at NIST. In the first case both hydrogen masers and cesium standards were used, and in the …

Direct Imaging of Static and Dynamic Ion Cloud Distributions in an Electron Beam Ion Trap

February 1, 2000
Author(s)
James V. Porto
… directly image highly charged ions within an electron beam ion trap (EBIT). Using an intensified CCD camera, we have the capability to measure both static and dynamic ion cloud distributions. The technique provides information … by other methods. Static images can be used to determine ion temperatures and the degree of overlap between the …

Unification of hydrogen-enhanced damage understanding through Strain-Life Experiments and Modeling

June 20, 2019
Author(s)
May L. Martin, Christopher P. Looney, Peter E. Bradley, Damian S. Lauria, Robert L. Amaro, Andrew J. Slifka
… testing of a 4130 pressure vessel steel was conducted in hydrogen gas through the careful adaptation of an existing hydrogen-gas mechanical testing apparatus. The strain-life mechanical results reveal that hydrogen has a significant effect on the strain-life, and …

Economic impact of applying high strength steels in hydrogen gas pipelines

June 17, 2015
Author(s)
Jeffrey W. Sowards, James R. Fekete, Robert L. Amaro
… will likely be employed extensively to transport gaseous hydrogen in support of a future clean energy economy. To date, a hydrogen-specific cost analysis of pipeline installation has … in order to quantify cost differentials associated with hydrogen pipeline installation relative to (a) natural gas …

Metallo-N-Heterocycles - A New Family of Hydrogen Storage Material

April 1, 2020
Author(s)
Khai Chen Tan, Yang Yu, Ruting Chen, Teng He, Zijun Jing, Qijun Pei, Jintao Wang, Yong Shen Chua, Anan Wu, Wei Zhou, Hui Wu, Ping Chen
… Storing hydrogen efficiently in condensed material under mild … technique challenge. Here, we developed a new family of hydrogen storage material spanning across the domain of … alkline earth metals to tune the thermodynamic property of hydrogen storage. Theoretical calculations reveal that the …

HYDROGEN PIPELINE RESEARCH AT NIST

March 31, 2008
Author(s)
Thomas A. Siewert, Joseph D. McColskey, Angelique N. Lasseigne
… greatly expanded its efforts in support of the use of hydrogen as a fuel.   Various NIST divisions have started … (Materials Reliability) has focused on the issues with hydrogen embrittlement of conventional pipeline and storage … hydrogen, mechanical testing, permeation, pipelines, test …

Equilibrium Structure of Hydrogen-Bonded Polymer Blends

November 1, 1998
Author(s)
C Zhou, Erik K. Hobbie, Barry J. Bauer, Charles C. Han
… neutron scattering (SANS). Miscibility is induced via hydrogen bonding between the DPS (OH) hydroxyl group and PBMA … attribute to the short-range site specific nature of the hydrogen bond interaction. … hydrogen bond, polymer blend, SANS … Equilibrium Structure of Hydrogen-Bonded Polymer Blends …

Hydrogen Embrittlement Susceptibility and Fracture Toughness Measurements of Welded X65M Pipeline Steels

November 14, 2024
Author(s)
Newell Moser, Zack Buck, Nicholas Derimow, May Ling Martin, Damian Lauria, Enrico Lucon, Peter Bradley, Matthew Connolly
… Hydrogen is known to deteriorate the mechanical performance of steels (i.e., hydrogen embrittlement). The welding processes involved in … contacts to assess the susceptibility of seam welds to hydrogen embrittlement; these three pipes are made from API … hydrogen, weld, fracture, piping …

Development of a combinatorial characterization scheme for high-throughput investigations of hydrogen storage materials.

December 16, 2011
Author(s)
Jason Hattrick-Simpers, Z. Tan, H. Oguchi, Chun Chiu, Edwin J. Heilweil, James E. Maslar, Leonid A. Bendersky
… reliably increase the throughput of materials measured for hydrogen storage properties, a complete high-throughput … scheme has been developed that accurately measures the hydrogen storage properties of materials in quantities … wedge samples using normalized IR emissivity imaging. The hydrogen storage properties of promising samples are …

Structural resolution and mechanistic insight into hydrogen adsorption in flexible ZIF-7

January 1, 2021
Author(s)
Ryan Klein, Sarah Shulda, Philip Parilla, Pierre Le Maqueres, Rachelle Richardson, William Morris, Craig Brown, C. Michael McGuirk
… frameworks offer a route towards high useable hydrogen storage capacities with minimal swings in pressure … and desorption profiles. Yet, the understanding of hydrogen-induced flexibility in candidate storage materials remains incomplete. Here, we investigate the hydrogen storage properties of a quintessential flexible …

Measurement of Hydrogen in Metal Alloys by Magnetic and Electronic Techniques

January 1, 2004
Author(s)
P. Termsuksawad, S. Niyomsoan, Ronald B. Goldfarb, V I. Kaydanov, David Olson, B. Mishra, Z Gavra
… and electronic measurements can be used to quantify hydrogen availability, absorption, and desorption in materials for nickel metal-hydride batteries and hydrogen storage. The ability of a metal alloy to absorb and desorb hydrogen depends on the interaction of the metal's electronic …

Fatigue Testing of Pipeline Welds and Heat-Affected Zones in Pressurized Hydrogen Gas

April 26, 2019
Author(s)
Elizabeth S. Drexler, Andrew J. Slifka, Robert L. Amaro, Jeffrey W. Sowards, Matthew J. Connolly, May L. Martin, Damian S. Lauria
… the fatigue crack growth rate (FCGR) in pressurized hydrogen gas and assess the area of the pipe that was most susceptible to fatigue when subjected to hydrogen gas. The relationship between FCGRs for welds and … stresses, differences in the actual path of the crack, and hydrogen pressure effects. …

High Pressure Release and Dispersion of Hydrogen in a Partially Enclosed Compartment : Effect of Natural and Forced Ventilation

September 2, 2013
Author(s)
Kuldeep R. Prasad, Thomas G. Cleary, Jiann C. Yang
… The study of compressed hydrogen release from high-pressure storage systems has practical application for hydrogen and fuel cell technologies. Such releases may occur … failure of a pressure release device (PRD). Understanding hydrogen behavior during and after the unintended release …

On the chemomechanics of bubble growth in hydrogen attack of plain carbon steels

May 2, 2025
Author(s)
May Martin, Kshitij Vijayvargia, T Nguyen, Mohsen Dadfarnia, Aleksandar Staykov, Petros Sofronis, Masanobu Kubota, John Pugh
… High temperature hydrogen attack (HTHA) is a form of degradation of carbon … steels exposed to high temperature and high-pressure hydrogen whereby internal hydrogen reacting with carbides forms methane gas bubbles … high temperature hydrogen attack, steel, modeling, damage …

Quasi-Elastic Neutron Scattering Studies of Hydrogen Dynamics for Nanoconfined NaAlH 4

July 14, 2016
Author(s)
Shathabish NaraseGowda, Craig Brown, Madhu Sudan Tyagi, Tabbetha A. Dobbins
… The hydrogen dynamics of nano-confined sodium alanate (NaAlH 4 ) … 4 indicates that there are two dynamic states of hydrogen which can be tracked by fitting the QENS signal to Lorentzian functions. The fastest hydrogen dynamics show some limited amount and range of long …

Fatigue measurement of pipeline steels for application of gaseous hydrogen transport

February 5, 2018
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Robert L. Amaro, Louis E. Hayden, Damian S. Lauria, Nikolas W. Hrabe, Douglas G. Stalheim
… crack growth rate of pipeline steels in pressurized hydrogen gas was completed; the project was sponsored by the … in close collaboration with the ASME B31.12 Committee on Hydrogen Piping and Pipelines. Four steels were selected, two X52 and two X70 alloys. Other variables included hydrogen gas pressures of 5.5 MPa and 34 MPa, a load ratio, …

Monoammoniate of Calcium Amidoborane - Synthesis, Structure and Hydrogen-Storage Properties

January 9, 2012
Author(s)
Yong Shen Chua, Hui Wu, Wei Zhou, Terrence J. Udovic, Guotao Wu, Zhitao Xiong, Ming Wah Wong, Ping Chen
… by the decomposition of Ca(NH 2 BH 3 ) 2 to release hydrogen. In a closed-system thermal decomposition process, hydrogen is liberated in two stages, at ca. 70 °C and 180 °C, … of the dehydrogenation, ca. 6 equiv. (ca. 10.2 wt. %) of hydrogen can be released, giving rise to the formation of CaB …
Displaying 101 - 125 of 3755
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