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Displaying 26 - 50 of 3755

In Situ Neutron Transmission Bragg Edge Measurements of Strain Fields Near Fatigue Cracks Grown in Air and in Hydrogen

August 14, 2017
Author(s)
Matthew Connolly, Peter Bradley, Andrew Slifka, Elizabeth S. Drexler
… field were performed near cracks grown in air and in hydrogen. Through the use of a novel test chamber which is capable of pressurization with hydrogen gas, and amenable to neutron-scattering … and discussed in the context of proposed mechanisms of hydrogen-assisted fatigue crack growth. …

Program and Abstracts for the International Conference on Hydrogen Effects on Material Behavior & Corrosion Deformation Interactions

September 12, 2001
Author(s)
N R. Moody, A -. Thompson, Richard E. Ricker, G S. Was, T -. Magnin
… and abstracts book for the International Conference on Hydrogen Effects on Material Behavior and Corrosion … corrosion, deformation, hydrogen, hydrogen embrittlement, stress corrosion cracking … International Conference on Hydrogen Effects on Materials Behavior and Corrosion …

Fundamental Constants and the Hydrogen Atom

January 1, 2001
Author(s)
Peter J. Mohr, Barry N. Taylor
… determined primarily by precise frequency measurements in hydrogen and deuterium. … Fundamental Constants and the Hydrogen Atom … Hydrogen Atom II: Precision Physics of Simple Atomic Systems … Fundamental Constants and the Hydrogen Atom …

Atomic Hydrogen for the Formation of Abrupt Sb Doping Profiles in MBE-Grown Si

May 1, 1998
Author(s)
P E. Thompson, C Silvestre, M E. Twigg, G Jernigan, David S. Simons
… Previously atomic hydrogen has been shown to be effective in reducing the … epitaxygrowth. In this work we have investigated atomic hydrogen to determine if it is equally effective in reducing … we demonstrated that the co-deposition of atomic hydrogen during Sb doping of Si at 500 C reduced the surface …

Preliminary Performance Assessment of Commercially-Available Hydrogen Sensors

November 12, 2007
Author(s)
Nathan D. Marsh, Thomas G. Cleary
… standard test methods for the performance of commercial hydrogen sensors, we employed the Fire Emulator / Detector … of a representative selection of commercially-available hydrogen sensors. These sensors depend on a variety of … They were evaluated both for their response to hydrogen concentrations up to half the lower flammability …

Measurements of effective diffusion coefficients of helium and hydrogen through gypsum

July 3, 2013
Author(s)
Jiann C. Yang, William M. Pitts, Marco G. Fernandez, Kuldeep R. Prasad
… to obtain effective diffusion coefficients of helium and hydrogen (released as forming gas for safety reasons) through … International Journal of Hydrogen Energy … Diffusion coefficient, Gypsum, Helium, Hydrogen … of effective diffusion coefficients of helium and hydrogen through gypsum …

Effect of Hydrogen on Pb(Zr,Ti)O 3 -Based Ferroelectric Capacitors

October 1, 1998
Author(s)
S R. Perusse, C W. Tipton, H D. Drew, T Venkatesan, R Ramesh, D B. Romero, V B. Podobedov, A Weber
… ferroelectric films are known to degrade when subjected to hydrogen in forming gas anneals. Earlier studies have … that though oxygen is lost during forming gas annealing, hydrogen incorporation is the primary mechanism for the … [OH-] bonds in the films. The most probable site for hydrogen ions is discussed based on ionic radii, crystal …

Negative Ion-Neutral Reactions in Townsend Discharges

July 1, 1999
Author(s)
James K. Olthoff, MVVS. Rao
… Relative intensities and translational ion-flux energy distributions are presented for negative ions … 2 kTd). These results are discussed in light of relevant ion-molecule reactions where available. … CF 4 , ion molecule reactions, negative ions, O 2 , SF 6 , Townsend …

High Resolution Inter- and Intramolecular Spectroscopy of Hydrogen Bonded Clusters: Benchmark Tests of Theory

January 1, 2000
Author(s)
David J. Nesbitt, S Davis, D T. Anderson
… tool for sub-Doppler near-IR spectroscopic study of hydrogen-bonded clusters under jet cooled conditions. The … associated with large amplitude vibrational motion of the hydrogen bond. In this paper, we describe efforts to map out … of all vibrational degrees of freedom for any hydrogen-bonded system. These data on HF-HF and DF-DF are …

MEASUREMENTS OF EFFECTIVE DIFFUSION COEFFICIENT OF HELIUM AND HYDROGEN THROUGH GYPSUM

September 14, 2011
Author(s)
Jiann Yang, William M. Pitts, Marco Fernandez, Kuldeep Prasad
… to obtain effective diffusion coefficients of helium and hydrogen (released as forming gas for safety reasons) through … gypsum panel was 1.3 × 10-5 m2/s and 1.4 × 10-5 m2/s for hydrogen. … Diffusion, Dispersion, Fire Safety, Garage, Gypsum, Helium, Hydrogen, Sensors …

Dose Calibration of Ion Implanters for Semiconductor Production

February 1, 1998
Author(s)
F A. Stevie, David S. Simons, J M. McKinley, J McMacken, R Santiesteban, P Flatch, J Becerro
… a relative uncertainty of less of 5%. The does of boron ion implants were measured by secondary ion mass spectrometry at two different laboratories using … Secondary Ion Mass Spectrometry SIMS XI … boron, ion implantation, silicon, SIMS … Dose Calibration of Ion Implanters for Semiconductor Production …

Infrared Spectra of Small Molecular Ions Trapped in Solid Neon

October 3, 2010
Author(s)
Marilyn E. Jacox
… Experiments in this laboratory trap molecular ions in dilute solid solution in neon at 4.2 K in sufficient … charge neutrality of the deposit. Recent observations of ions produced from C2H4 and BF3 will be discussed. Because of … Spectroscopy of Molecular Ions in the Laboratory and in Space …

Highly Charged Ion Studies at the NIST EBIT

January 1, 2001
Author(s)
L P. Ratliff, J R. Roberts
… Highly Charged Ion Studies at the NIST EBIT … atoms, EBIT, electron beam ion trap, highly charged ions, ions … Highly Charged Ion Studies at the NIST EBIT …

A NUMERICAL STUDY OF THE RELEASE AND DISPERSION OF A BUOYANT GAS IN PARTIALLY CONFINED SPACES

March 4, 2011
Author(s)
Kuldeep R. Prasad, William M. Pitts, Jiann C. Yang
… Development of the hydrogen economy will require a better understanding of the … and explosions associated with the unintended release of hydrogen within a structure. The ability to predict the mixing and dispersion behavior of hydrogen, when accidentally released in a partially confined …

FCGR of Pipeline Steels in Pressurized Hydrogen Gas: A Comparison of Cyclic Loading Rates

May 5, 2014
Author(s)
Elizabeth S. Drexler, Andrew J. Slifka, Robert L. Amaro, Damian S. Lauria
… A gaseous hydrogen environment is believed to have a deleterious effect … conducting tests at sufficiently slow rates in a gaseous hydrogen environment can be prohibitively long and expensive, … at cyclic loading rates of 1 Hz, 0.1 Hz, and 0.01 Hz in a hydrogen gas environment pressurized to 5.5 MPa or 34 MPa. …

Trapping Highly Charged Ions: Fundamentals and Applications

April 1, 2000
Author(s)
John D. Gillaspy
… Fundamentals and applications for trapping highly charged ions. … Trapping Highly Charged Ions: Fundamentals and Applications … Trapping Highly Charged Ions: Fundamentals and Applications …

Hydrogen Release and Combustion Measurements in a Full Scale Garage

January 1, 2010
Author(s)
Matthew Blais, Alexandra Joyce
… to support NIST efforts on characterizing the behavior of hydrogen when released into enclosed spaces (e.g. leakage of hydrogen from a fuel-cell powered automobile parked inside a … were designed to characterize both the dispersion of hydrogen and combustion behavior of any flammable mixtures …

Relativistic Atomic Structure Theory for Highly-Charged Ions

February 19, 2017
Author(s)
Yong Sik Kim
… summarized with emphasis on applications to highly-charged ions. … Trapping Highly-Charged Ions: Fundamentals and Applications … atomic structure theory, highly-charged ions, relativity … Relativistic Atomic Structure Theory for Highly-Charged Ions …

Thermodynamic Evaluation of Hydrogen Absorption by Niobium During SRF Fabrication

June 30, 2011
Author(s)
Richard E. Ricker, Ganapati R. Myneni
… conditions. One hypothesis for these variations is that hydrogen, absorbed during processing, is responsible for this … behind this hypothesis is that niobium can absorb hydrogen from one or more of the processing environments. … spontaneously react with water producing adsorbed atomic hydrogen that is readily absorbed into the metal. The …

Neutron Imaging Studies of Metal-Hydride Storage Beds

December 1, 2010
Author(s)
David Jacobson, Daniel Hussey, Elias Baltic, Terrence J. Udovic, John J. Rush, Robert C. Bowman
… transient and steady-state distributions, respectively, of hydrogen within a prototypical, LaNi4.78Sn0.22-based hydrogen storage bed during and after various absorption and … steps. It was shown that using deuterium instead of hydrogen enabled the imaging of thicker beds. These …

Ionic Hydrogen bond Networks and Ion Solvation 1. An Efficient Monte Carlo / Quantum Mechanical Method for Structural Search and Energy Computation: Ammonium / Water

February 25, 2009
Author(s)
Yi-Lei Zhao, Michael Mautner, Carlos A. Gonzalez
… Hydrogen bond networks about solvated ions can form many … we compute the stepwise hydration energy of the ammonium ion in NH4 +(H2O)n clusters (n = 1-8), for which experimental … this work should be useful for simulating relatively large ion/solvent systems. … Hydrogen bond, ammonium, water, tight-binding theory …

Extensive hydrogen incorporation is not necessary for superconductivity in topotactically reduced nickelates

August 27, 2024
Author(s)
Purnima P. Balakrishnan, Dan F. Segedin, Lin E. Chow, P. Quarterman, Shinichiro N. Muramoto, Mythili Surendran, Ranjan K. Patel, Harrison LaBollita, Grace A. Pan, Qi Song, Yang Zhang, Ismail El Baggari, Koushik Jagadish, Yu-Tsun Shao, Berit H. Goodge, Lena F. Kourkoutis, Srimanta Middey, Antia S. Botana, Jayakanth Ravichandran, A. Ariando, Julia Mundy, Alexander Grutter
… layered superconducting nickelate films is the role that hydrogen incorporation into the lattice plays in the … have introduced the possibility that the incorporation of hydrogen from the reducing agent into the nickelate lattice … (Nd,Sr)NiO2 / SrTiO3. We find no evidence for extensive hydrogen incorporation across a broad range of samples, …

Adsorption From Solutions on Synthetic Hydroxyapatite: Nonaqueous Versus Aqueous Solvents

July 1, 1999
Author(s)
D N. Misra
… on hydroxapatite is mainly regulated by the interplay of hydrogen bonding between adsorbate, adsorbent, and solvent. … the chemisorbed and physisorbed water. This interplay of hydrogen bonding in conjunction with chemical and structural … of solutes from aqueous solutions generally involves ion-exchange with the apatite surface, and may be affected by …
Displaying 26 - 50 of 3755
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