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Displaying 3251 - 3275 of 4637

X-Ray Spectrometer Having 12 000 Resolving Power at 8 keV Energy

May 14, 2018
Author(s)
Lawrence T. Hudson, John F. Seely, Uri Feldman, Albert Henins
An x-ray spectrometer employing a thin (50 μm) silicon transmission crystal was used to record high-resolution Cu Kα spectra from a laboratory x-ray source. The diffraction was from the (331) planes that were at an angle of 13.26° to the crystal surface

Testing of Cementitious Materials Using a Dynamic MEMS Micro Rheometer

May 17, 2016
Author(s)
Yong Sik Kim, Nicholas G. Dagalakis, Chiara C. Ferraris, Nicos Martys
Incompatibility of cementitious materials with admixtures often requires time consuming testing. Usually, several mixtures need to be prepared either using concrete or paste to determine the optimum high range water reducer dosage (HRWRA) and type. The

Electrodeposition of Al-W-Mn Ternary Alloys from the Lewis Acidic Aluminum Chloride?1-Ethyl-3-methylimidazolium Chloride Ionic Liquid

November 16, 2015
Author(s)
Gery R. Stafford, Tetsuya Tsuda, Yuichi Ikeda, Akihito Imanishi, Shohei Kusumoto, Sudsumu Kuwabata, Charles Hussey
The electrodeposition of non-equilibrium ternary Al-W-Mn alloys was examined in the Lewis acidic 66.7-33.3 mole ratio aluminum chloride–1-ethyl-3-methylimidazolium chloride (AlCl3–[C2mim]Cl) ionic liquid (IL). K3[W2Cl9] and MnCl2 were added to provide

Development of a MEMS based Dynamic Rheometer

August 31, 2010
Author(s)
Gordon Christopher, Jae M. Yoo, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Rheological methods that interrogate nano-liter scale volumes of fluids and solids have advanced considerably over the past decade, yet there remains a need for methods that probe the frequency dependent complex rheological moduli through application of

Cracking in Brittle Laminates from Concentrated Loads

June 1, 2002
Author(s)
H Chai, Brian R. Lawn
A study is made of the crack resistance of multilaminates consisting of brittle layers interleaved with compliant interlayers and bonded to compliant substrates. Specific attention is paid to flexure generated radial cracks in the undersurfaces of

A Low-Power Reversible Alkali Atom Source

June 13, 2017
Author(s)
Songbai Kang, Russell P. Mott, Kevin A. Gilmore, Logan D. Sorenson, Matthew T. Rahker, Elizabeth A. Donley, John E. Kitching, Christopher S. Roper
… cold-atom system, solid ion conductor, reversible alkali source …

Exceptional Superionic Conductivity in Disordered Sodium Decahydro-closo-decaborate

October 13, 2014
Author(s)
Terrence J. Udovic, Motoaki Matsuo, Wan Si NMN Tang, Hui Wu, Vitalie Stavila, Alexei V. Soloninin, Roman V. Skoryunov, Olga A. Babanova, Alexander Skripov, John J. Rush, Atsushi Unemoto, Hitoshi Takamura, Shin-Ichi Orimo
… represents a major advancement for solid-state Na + fast-ion conduction at lower temperatures. …

The era of coherent optical frequency references

September 29, 2004
Author(s)
Leo W. Hollberg, Christopher W. Oates, Scott Diddams, G Wilpers, A Bartels, C Hoyt, Zeb Barber
The past four years have shown a dramatic improvement in the performance of optical frequency references and in the methods by which they are calibrated and utilized. These revolutionary changes result from better stabilized lasers that probe narrow

Lattice Light Shift Evaluations In a Dual-Ensemble Yb Optical Lattice Clock

January 22, 2025
Author(s)
Tobias Bothwell, Roger Brown, Benjamin Hunt, Jacob Siegel, Tanner Grogan, Youssef Hassan, Kyle Beloy, Andrew Ludlow, Kurt Gibble, Takumi Kobayashi, Marianna Safronova, Sergey Porsev
In state-of-the-art optical lattice clocks, beyond-electric-dipole polarizability terms lead to a break-down of magic wavelength trapping. In this Letter, we report a novel approach to evaluate lattice light shifts, specifically addressing recent
Displaying 3251 - 3275 of 4637
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