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Displaying 951 - 975 of 3757

Results from neutron imaging phase change experiments with LH2 and LCH4

July 2, 2022
Author(s)
Kishan Bellur, Ezequiel Medici, Daniel Hussey, David Jacobson, Jacob LaManna, Juscelino Leao, Julia Scherschligt, James Hermanson, Chang Kyoung Choi, Jeffrey Allen
… Predicting evaporation and cryo-storage behavior of liquid hydrogen poses a challenge for both terrestrial energy … rates were determined through image processing. Both hydrogen and methane are perfectly wetting fluids as … propellant, condensation, evaporation, thin film, liquid hydrogen, liquid methane …

Scalable arrays of doped silicon RF Paul traps

October 26, 2009
Author(s)
Joseph W. Britton, Dietrich G. Leibfried, James A. Beall, Brad R. Blakestad, Janus H. Wesenberg, David J. Wineland
… and a multi-zone surface-electrode trap. From the measured ion motional heating rate we determine an electric field spectral density at the ion of approximately 1 × 10 -10 (V /m) 2 Hz −1 at ωz /2π {math equals} 1.125 MHz when the ion lies 40 υm above the electrode surface. One application …

3D Molecular Imaging SIMS

July 1, 2006
Author(s)
John G. Gillen, Albert J. Fahey, M Wagner, Christine M. Mahoney
… analyzed by dynamic SIMS using SF 5 + polyatomic primary ion bombardment. Each of these systems exhibited minimal … through the depth of the film. By combing secondary ion imaging with depth profiling, 3-dimensional molecular … sections are cut in the samples with the SF5+ primary ion beam to produce a laterally magnified cross section of …

Computational study of the dielectric properties of [La,Sc] 2 O 3 solid solutions

July 11, 2010
Author(s)
Hiroyoshi Momida, Eric J. Cockayne, Naoto Umezawa, Takahisa Ohno
… predicted at small Sc concentrations due to the rattling ion effect. Similar calculations for a model amorphous La2O3 … the Sc changes in a way that compensates for the rattling ion effect. … gate dielectrics, high-k dielectrics, rattling ion effect …

Collisional Electron-Detachment and Ion Conversion Processes in SF6

November 1, 1990
Author(s)
James K. Olthoff, Richard J. Van Brunt, Yicheng Wang, L. D. Doverspike, R. Champion
… 6th Intl. Swarm Seminar entitled Nonequilibrium Effects in Ion and Electron Transport, … Collisional Electron-Detachment and Ion Conversion Processes in SF6 …

Amorphous Calcium Phosphate/Urethane Methacrylate Resin Composites. I. Physicochemical Characterization

May 7, 2007
Author(s)
William Regnault, Tonya Icenogle, Joseph M. Antonucci, Drago Skrtic
… were polymerized and evaluated for mechanical strength and ion release profiles in different aqueous media. Strength of … and the pH of the liquid environment strongly affected the ion release kinetics. In saline, the UDMA/PEG-U composite … a sustained release for at least 350 h. The initially high ion release of the PEG-U composites decreased after 72 h, …

Fabrication of Lithium Indolide and Derivates for Ion Conduction

September 14, 2022
Author(s)
Jintao Wang, Yang Yu, Anan Wu, Khai Chen Tan, Hui Wu, Teng He, Ping Chen
… Alkali-ion batteries have been widely used nowadays. The development … derivates show pronounced ionic conductivities, e.g., the ion conductivity of sodium carbazolide ditetrahydrofuran … Fabrication of Lithium Indolide and Derivates for Ion Conduction …

Glycosidic Linkage Conformation of Methyl-alpha-Mannopyranoside

July 31, 2008
Author(s)
Orkid Coskuner, Denis E. Bergeron, Luis C. Rincon, Jeffrey W. Hudgens, Carlos A. Gonzalez
… classical simulations are insensitive to intermolecular hydrogen bonding interactions that CPMD simulations identify … DFT, CPMD, MD, hydration, hydrogen bonds, carbohydrate. …

A single-atom optical clock with high accuracy

July 14, 2006
Author(s)
Windell Oskay, Scott A. Diddams, Elizabeth A. Donley, Tara M. Fortier, Thomas P. Heavner, Leo W. Hollberg, Wayne M. Itano, Steven R. Jefferts, M J. Jensen, Kyoungsik Kim, F Levi, Thomas E. Parker, James C. Bergquist
… transition in a single, laser-cooled, trapped mercury ion. In this comparison, the fractional systematic frequency … conclusively that frequency control in the mercury-ion system is possible at a level superior to that of the … cesium fountain, femtosecond laser frequency comb, mercury-ion frequency standard, optical frequency standard, …

The Influence of d-Phase on the Environmentally Assisted Cracking Resistance of an Additively Manufactured Nickel-Based Superalloy

November 22, 2023
Author(s)
Mark R. Stoudt, Richard E. Ricker
… acidified chloride environment under controlled potential (hydrogen fugacity) and freely corroding conditions. The … properties and significantly increased cracking when hydrogen was introduced into the metal. This difference is … the density and severity of the interactions between the hydrogen, -phase particles, incoherent boundaries, and …

CrO 3 Based Proton Conductors

November 1, 2016
Author(s)
Laura Mazzei, Max Wolff, Daniele Pergolesi, Joseph Dura, Lars Borjesson, Philipp Gutfreund, Marco Bettinelli, Thomas Lippert, Maths Karlsson
… characterized by relatively strong O-H bonds due to weak hydrogen-bond interactions to neighboring oxygen atoms and … lower than in proton sites associated with stronger hydrogen bonds. This not only suggests that strongly … also that the rate of proton conductivity is determined by hydrogen-bond mediated proton transfer between neighbouring …

Frequency Measurements of Al+ and Hg+ Optical Standards

June 8, 2009
Author(s)
Wayne M. Itano, James C. Bergquist, Till P. Rosenband, David J. Wineland, David Hume, Chin-wen Chou, Steven R. Jefferts, Thomas P. Heavner, Tom Parker, Scott Diddams, Tara Fortier
… aluminum ion, mercury ion, optical frequency standards, time variation of fundamental constants, trapped ion frequency standards …

Quantum Computation, Spectroscopy of Trapped Ions, and Schrodinger Cat

January 1, 1999
Author(s)
David J. Wineland, C Monroe, Wayne M. Itano, D Kielpinski, B E. King, C J. Myatt
… at NIST to implement quantum computation using trapped ions, based on a scheme proposed by J.I. Cirac and P. Zoller … Quantum Computation, Spectroscopy of Trapped Ions, and Schrodinger Cat …

An 27 Al+ quantum-logic clock with systematic uncertainty below 10 -18

July 15, 2019
Author(s)
Samuel M. Brewer, Jwo-Sy Chen, Aaron M. Hankin, Ethan Clements, Chin-wen Chou, David J. Wineland, David Hume, David Leibrandt
… a frequency stability of 1.2 X 10 -15 /(T 1/2 ). A 25 Mg + ion is simultaneously trapped with the 27 Al + ion and used for sympathetic cooling and state readout during … to previous 27Al+ clocks, enabling clock operation with ion motion near the three-dimensional ground state. Operating …
Displaying 951 - 975 of 3757
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