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Displaying 1976 - 2000 of 4635

A Fermi Gas of Atoms

April 1, 2002
Author(s)
Deborah S. Jin
Cooper pairing of atoms in a gas would provide a new and unique example of a fermionic condensate. However, recent theoretical treatments,by Murray Holland at JILA and by Eddy Timmermans at Los Alamos, have suggested that a superfluid phase transition in

Applying Planar, Patterned, Multimetallic Samples to Assess the Impact of Analysis Area in Surface-Chemical Analysis: results of a VAMAS Interlaboratory Comparison

February 3, 2020
Author(s)
Christina Passiu, WES Unger, P Rupper, L Gregoratti, M Amanti, P Zeller, C Malitesta, S Rella, SJ Spencer, A Shard, A Kim, Shinichiro N. Muramoto, M Engelhard, B Hagenhoff, B Bock, R Heuberger, P Dietrich, A Thissen, M Kjaervik, D Paul, J Newman, T Weimann, S Butefisch, ND Spencer, A Rossi
… also tested the samples with time-of-flight secondary-ion mass spectrometry (ToF-SIMS), Auger electron spectroscopy … spots and squares with sizes between 200 µm and 5 µm in a gold film on a Si wafer was developed by PTB and tested in …

Multiscale Metrologies for Process Optimization of Carbon Nanotube Polymer Composites

July 18, 2016
Author(s)
Bharath N. Natarajan, Nate Orloff, Rana N. Ashkar, Sagar Doshi, Kevin A. Twedt, Ajay Krishnamurthy, Chelsea S. Davis, Aaron M. Forster, Erik Thostenson, Jan Obrzut, Renu Sharma, James Alexander Liddle
… across multiple length scales using scanning gallium-ion microscopy, transmission electron microscopy and … of hybrid functional materials, such as graphene, gold nanorod and carbon black nanocomposites. …

SOLID PHASE MICROEXTRACTION SORBENTS

June 1, 2015
Author(s)
Thomas J. Bruno, Paris D. Svoronos Cambanas
While trapping sorbents have been used for many years in headspace analysis (most commonly with gas chromatography), the modern techniques of solid phase microanalysis (SPME) are particularly applicable to survey analyses [1]. In the following tables, we

The National Bureau of Standards Reactor at the NIST Center for Neutron Research

October 5, 2020
Author(s)
Thomas Newton, Daniel J. Flynn, Robert Williams
The National Bureau of Standards Reactor at the NIST Center for Neutron Research (NCNR) is a 20 MW reactor using 93% enriched UO 2 plate-type fuel with D 2O coolant, moderator, and reflector, and is used for a variety of neutron science applications. 23 of

Fatigue Sensitivity of Y-TZP to Microscale Sharp-Contact Flaws

August 14, 2004
Author(s)
Yu Zhang, Brian R. Lawn
The strength degrading effects of sharp-contact damage are examined for Y-TZP ceramic plates bonded to a plastic substrate. Microscale contacts are made with Vickers and Berkovich diamond indenters at low loads (0.01 N to 10 N) in the ceramic lower

Manipulation of Feshbach Resonances in Ultracold Atomic Collisions Using Time-Dependent Magnetic Fields

February 1, 2000
Author(s)
F H. Mies, Eite Tiesinga, Paul S. Julienne
… dynamics of two ultracold Na atoms in an atom trap where a time-dependent magnetic field B(t) moves a … threshold from above, two atoms in the ground state of the trap potential can be efficiently converted to transitionally … ground state and placed in hot vibrational levels of the trap. Our calculations reproduce the rapid atom loss rates …

Improved Accuracy for Calibrated Mass Distribution Measurements of Bimetallic Nanoparticles

May 23, 2022
Author(s)
Kaleb Duelge, George Mulholland, Antonio Montoro Bustos, Michael Zachariah, Michael Zachariah, John Pettibone
… and especially HNP, masses have been reported. We chose gold titania catalyst HNPs (Au@TiO2: 4 nm gold NPs adsorbed on 100 nm–300 nm TiO2 NPs) as a … slope was observed that led to an overestimation of both gold (Au) and titanium (Ti) by nearly a factor of four for …

Manipulating Interface Magnetism in Manganite Thin Film Membranes by Substrate Surface Chemistry

November 13, 2024
Author(s)
Purnima P. Balakrishnan, Qinwen Lu, Qing Wang, Shinichiro N. Muramoto, Paige Quarterman, Michael R. Fitzsimmons, Timothy R. Charlton, Xiaofang Zhai, Alexander Grutter
… work, we use polarized neutron reflectometry and secondary ion mass spectroscopy to provide a detailed understanding of … magnetism, polarized neutron reflectometry, secondary ion mass spectroscopy …

An Ultrasonic Measurement of Magnetostriction

October 1, 1997
Author(s)
B Igarashi, G A. Alers, P T. Purtscher
The amplitudes of shear horizontal plate waves generated by EMATs (electromagnetic acoustic transducers) are measured to obtain estimated of the magnetostriction of a steel specimen. The wave amplitude is linked to magnetrostriction through an existing

Miniature all-solid-state heterostructure nanowire Li-ion batteries as a tool for engineering and structural diagnostics of nanoscale electrochemical processes.

August 15, 2014
Author(s)
Vladimir P. Oleshko, Thomas F. Lam, Dmitry A. Ruzmetov, Paul M. Haney, Henri J. Lezec, Albert Davydov, Sergiy Krylyuk, John Cumings, Albert A. Talin
… and phase transformations that govern the operation of Li-ion batteries (LiBs) require detailed nanoscale 3D structural … Miniature all-solid-state heterostructure nanowire Li-ion batteries as a tool for engineering and structural …
Displaying 1976 - 2000 of 4635
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