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Displaying 126 - 150 of 3755

Small-Pore Hydridic Frameworks Store Densely Packed Hydrogen

February 6, 2024
Author(s)
Hyunchul Oh, Nikolay Tumanov, Voraksmy Ban, Xiao Li, Bo Richter, Matthew Hudson, Craig Brown, Gail Iles, Dirk Wallacher, Scott Jorgensen, Luke Daemen, Rafael Balderas-Xicohtencatl, Yongqiang Cheng, Anibal Ramirez-Cuesta, Michael Heere, Sergio Posada-Perez, Geoffroy Hautier, Michael Hirscher, T. Jensen, Yaroslav Filinchuk
… and a partially negatively charged non-flat interior for hydrogen and nitrogen uptake. Hydrogen and nitrogen occupy distinctly different adsorption … capacities of 2.33 H2 and 0.66 N2 per Mg(BH4)2. Molecular hydrogen is packed extremely densely, with about twice the …

Charge States of y Ions in the Collision-Induced Dissociation of Doubly Charged Tryptic Peptide Ions

February 25, 2011
Author(s)
Pedatsur Neta, Stephen E. Stein
… relative intensities of charge states of product y- and b-ions depend on the final location of that proton. This study … distributions for dissociation of doubly charged peptide ions, using a large reference library of peptide ion fragmentation generated from ion-trap CID of peptide ions from tryptic digests. Trends in relative intensities of …

Mg-Fe Thin Films: A Phase-separated Structure with Fast Kinetics of Hydrogenation

September 20, 2012
Author(s)
Shiyou Zheng, Ke Wang, Vladimir Oleshko, Leonid A. Bendersky
… paper we suggest a new approach to improve the kinetics of hydrogenation based on a material with high density of … Pd were prepared by electron beam co-deposition and their hydrogenation/dehydrogenation kinetics and cycling properties … 413 K. The structures of the thin films before and after hydrogenation during different cycles were investigated by …

A Miniature EBIT with Ion Extraction for Isolating Highly Charged Ions

May 28, 2015
Author(s)
Shannon Hoogerheide, Joseph Tan
… development of a room-temperature miniature electron beam ion trap (EBIT) for efficient production of charge states … and electric potential necessary for the production of ions in the EBIT. In addition to radial access for in-EBIT … select a single charge state to be isolated in a secondary ion trap for further study. One goal is the production of …

Metal Amidoboranes

September 1, 2011
Author(s)
Hui Wu, Wei Zhou, Taner Yildirim
… potential to meet the stringent gravimetric and volumetric hydrogen storage capacity targets needed for transportation … to AB, metal amidoboranes have been shown to release hydrogen at lower temperatures, and at higher rates and with … several metal amidoboarnes also appear to release hydrogen less exothermically than AB. In this chapter, we …

A Compilation of Enthalpies of Formation for Hydrogen-Oxygen (HxOy) Species

March 11, 2016
Author(s)
Donald R. Burgess Jr.
… work, we have compiled enthalpies of formation for nine hydrogen-oxygen species (HxOy) and selected values for use. … Bond dissociation energies, Atomization energies, Hydrogen-oxygen species … A Compilation of Enthalpies of Formation for Hydrogen-Oxygen (HxOy) Species …

Operating Hydrogen Gas Transmission Pipelines at Pressures above 21 MPa

November 12, 2018
Author(s)
Andrew Slifka, Elizabeth S. Drexler, Robert L. Amaro, Peter Bradley, Damian Lauria
… The economical and efficient transportation of hydrogen gas is necessary for it to become a widespread … to improve the economics is to lower the cost of building hydrogen gas pipelines. The recent modification to the ASME B31.12 Code for Hydrogen Piping and Pipelines begins to lower the cost of …

Preparation and Certification of Hydrogen in Titanium Alloy Standard Reference Materials

August 4, 2012
Author(s)
Rick L. Paul, Richard M. Lindstrom
… A series of three Hydrogen in Titanium Alloy Standard Reference Materials (SRMs 2452, 2453, and 2454) were prepared with hydrogen mass fractions bracketing the hydrogen specification limit of 125 mg/kg. Commercial … titanium alloys, hydrogen, standard reference materials, activation analysis, …

FATIGUE CRACK GROWTH OF TWO PIPELINE STEELS IN A PRESSURIZED HYDROGEN ENVIRONMENT

October 22, 2013
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Nicholas Nanninga, Yaakov Levy, Joseph D. McColskey, Robert L. Amaro
… results were compared with tests conducted in pressurized hydrogen gas. All tests were run at (load ratio) R = 0.5 and … one test on X100, run at 0.1 Hz. Tests were conducted at hydrogen pressures of 1.7 MPa, 7 MPa, 21 MPa, 48 MPa. Fatigue … X100 and X52 were significantly higher in a pressurized hydrogen environment than in air. This enhanced growth rate …

Performance Evaluation of High-Strength Steel Pipelines for High-Pressure Gaseous Hydrogen Transportation

April 1, 2013
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Robert L. Amaro, Joseph D. McColskey, Yaoshan Chen, Ming Liu, Yong-Yi Wang
… of their mechanical properties in high-pressure gaseous hydrogen, including their fatigue cracking resistances to … were performed on X52 and X70 steels in both air and hydrogen gas pressurized to 5.5 MPa and 34 MPa. Experimental results indicate that the presence of gaseous hydrogen increases the FCGR of all materials tested. At lower …

Neutron Scattering Studies of Materials for Hydrogen Storage

August 28, 2021
Author(s)
Ryan Klein, Hayden Evans, Benjamin Trump, Terrence J. Udovic, Craig Brown
… Hydrogen storage presents a significant barrier to the widespread adaptation of hydrogen as an energy source in mobile and stationary applications. The development of new candidate hydrogen storage materials is therefore an outstanding goal … hydrogen storage, neutron diffraction, inelastic neutron …

Ab initio kinetic coefficients of gaseous hydrogen

January 9, 2010
Author(s)
James B. Mehl, Marcia L. Huber, Allan H. Harvey
… The spherical portion of the hydrogen intermolecular potential recently determined in ab … and spherical contribution to the thermal conductivity of hydrogen using a full quantum-mechanical formalism. … difference between three experimental data sets for hydrogen spanning 21 314 K was (0.3 1.0)%; the average …

A compact, UHV ion source for enriching 28Si and depositing epitaxial thin films

August 22, 2019
Author(s)
Ke Tang, Hyun S. Kim, Aruna N. Ramanayaka, David S. Simons, Joshua M. Pomeroy
… An ultra-high-vacuum (UHV) compatible Penning ion source for growing pure, highly enriched 28Si epitaxial … discuss the discharge properties of this new source, the ion mass spectrum when coupled to our mass filter, and the secondary ion mass spectroscopy (SIMS) of the grown films. …

The Mobilities of NO + (CH 3 CN)n Cluster Ions (n=0-3) Drifting in helium-Acetonitrile Mixtures

December 1, 1996
Author(s)
J A. de Gouw, L N. Ding, M Krishnamurthy, H S. Lee, E B. Anthony, V M. Bierbaum, S R. Leone
… The mobilities of NO+(CH 3 CN) n cluster ions (N=0-3) drifting in helium and in mixtures of helium and … of the geometric cross sections of the different cluster ions. The rate constants for the various cluster formation … 2 and NO + (CH 3 CN) 3 , the drift velocities for these ions are found to be strongly dependent on the acetonitrile …

Optimization of the Pore Structures of MOFs for Record High Hydrogen Volumetric Working Capacity

April 28, 2020
Author(s)
Xin Zhang, Rui-Biao Lin, Jing Wang, Bin Wang, Bin Liang, Taner N. Yildirim, Jian Zhang, Wei Zhou, Banglin Chen
… frameworks are promising materials for onboard hydrogen storage thanks to the tunable pore size, pore … structures, the correlation between the pore volume and hydrogen storage capacity is examined and two empirical equations are rationalized to predict the hydrogen storage capacity of MOFs with different pore …

Hydrogen Field Test Standard: Laboratory and Field Performance

November 10, 2015
Author(s)
Jodie G. Pope, John D. Wright
… and measures inspectors to periodically test retail hydrogen dispensers, much as gasoline dispensers are tested … Flow Facility with helium gas and in the field at a hydrogen dispenser location. All three methods agree within … test drafts of helium gas in the laboratory setting and of hydrogen gas in the field, respectively. The time required to …

Scanning Ion Microscopy with Low Energy Lithium Ions

July 1, 2014
Author(s)
Kevin A. Twedt, Lei Chen, Jabez J. McClelland
… Using an ion source based on photoionization of laser-cooled lithium atoms, we have developed a scanning ion microscope with probe sizes of a few tens of nanometers … in ion microscopy when detecting backscattered ions, due to a decreased interaction volume and the potential …

THE EFFECT OF MICROSTRUCTURE ON THE HYDROGEN-ASSISTED FATIGUE OF PIPELINE STEELS

July 14, 2013
Author(s)
Andrew J. Slifka, Elizabeth S. Drexler, Robert L. Amaro, Damian S. Lauria, April Stevenson, Douglas G. Stalheim, Louis E. Hayden
… fatigue tests were performed at 5.5 and 34 MPa pressurized hydrogen gas, at 1 Hz and (load ratio) R=0.5. At high pressures of hydrogen and high values of the stress intensity range (ΔK) … fatigue, hydrogen, hydrogen embrittlement, microstructure, pipeline steel, X52, …

Outlook and Challenges for Hydrogen Storage in Nanoporous Materials

March 1, 2016
Author(s)
D. P. Broom, C. J. Webb, K. E. Hurst, P. A. Parilla, T. Gennett, Craig Brown, R. Zacharia, E. Tylianakis, E. Klontzas, G. E. Froudakis, Th. A. Steriotis, P. N. Trikalitis, D. L. Anton, B. Hardy, D. Tamburello, C. Corgnale, B. A. van Hassel, D. Cossement, R. Chahine, M. Hirscher
… been made recently in the use of Nanoporous materials for hydrogen storage. In this article, the current status of the … of the experimental investigation of real adsorptive hydrogen storage tanks, the improvement of the thermal … hydrogen storage, adsorption, isotherm, structure, …

Infrared emission imaging as a tool for characterization of hydrogen storage materials

December 6, 2008
Author(s)
H. Oguchi, Edwin J. Heilweil, Daniel Josell, Leonid A. Bendersky
… the in-situ hydrogenation of Mg_x}Ni_1-x} films with hydrogen gas; the method is shown to be a powerful … combinatorial screening tool for metal hydrides-base hydrogen storage materials. The 100 nm-thick Mg_x}Ni_1-x} … differences of the metallic and hydride phases. Hydrogen absorption and desorption of the films were …

Hydrogen Field Test Standard Design, Operating Instructions, & Specifications

September 10, 2015
Author(s)
Jodie G. Pope
… and measures inspectors to periodically test retail hydrogen gas dispensers, much as gasoline dispensers are … Flow Facility with helium gas and in the field at a hydrogen dispenser location. This document describes the … safety instrumentation for working with high pressure hydrogen gas, how to execute tests with the FTS, and the …

Hydrogen traps in the outgassing model of a stainless steel vacuum chamber

March 31, 2014
Author(s)
Robert F. Berg
… This article describes a model for hydrogen outgassing into a stainless steel vacuum chamber. It … accounts for the geometry of the chamber components, the hydrogen dissolved in those components, and the processes of … recombination, and trapping. Strongly bound or “trapped” hydrogen, which occurs at heterogeneities such as …

X-Ray Spectroscopy of Trapped Ions With a Microcalorimeter on the NIST Electron Beam Ion Trap

December 1, 2002
Author(s)
E Takacs, John D. Gillaspy, L P. Ratliff, K Makonyi, J M. Laming, E Silver, H. Schnopper, M Barbera, J. Beeman, E. E. Haller, N. Madden
… The electron beam ion trap (EBIT) was invented about 15 years ago. Judging from … and study the structure and interactions of highly charged ions. Today, EBITs exist in several different laboratories … in a variety of fields of research where multiply charged ions relevant. Recent astrophysical missions by NASA and …
Displaying 126 - 150 of 3755
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