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Displaying 201 - 225 of 1600

On-Wafer Vector-Network-Analyzer Measurements at mK Temperatures

January 11, 2023
Author(s)
Elyse McEntee Wei, Richard Chamberlin, Nate Kilmer, Joshua Kast, Jake A. Connors, Dylan Williams
We describe a system for performing on-wafer vector-network-analyzer measurements from 100 MHz to 15 GHz at mK temperatures (i.e., less than 20 mK). We first demonstrate a camera-less probe positioning system and calibrate this system at 4.4 K. We then use

Mean Recurrence Intervals of Failure Wind Loads

August 1, 2008
Author(s)
Dat Duthinh, Joseph A. Main, Amelia P. Wright, Emil Simiu
… The Commentary to the ASCE Standard 7-05 states that the nominal mean recurrence interval (MRI) … of the wind speed inducing the design strength is about 500 years if the specified load factor is 1.5, as in early versions of ASCE 7, and somewhat higher than 500 years if the specified load factor is 1.6, as in ASCE …

In Situ Imaging of Highly Charged Ion Irradiated Mica

January 1, 2001
Author(s)
L P. Ratliff, John D. Gillaspy
We have studied the modification of mica surfaces due to the impact of Xe44+ ions by imaging the ion-exposed surfaces with atomic force microscopy in vacuum. By incorporating the microscope into the vacuum chamber where the samples are exposed to the ions

Spectrum and Energy Levels of Singly-Ionized Mercury (Hg II)

March 1, 2001
Author(s)
Craig J. Sansonetti, Joseph Reader
… of singly-ionized mercury (Hg II) has been observed from 500 to 9880 with sliding sparks and pulsed-RF discharges on 10.7-m grating spectrographs in vacuum and air. About 500 lines have been classified as transitions between 114 …

A COLD-ATOM CLOCK BASED ON COHERENT POPULATION TRAPPING

November 26, 2012
Author(s)
Elizabeth A. Donley, Francois-Xavier R. Esnault, Eric M. Blanshan, John E. Kitching
A compact cold-atom clock based on coherent population trapping is being developed. The clock aims to ultimately achieve a timing uncertainty of a few nanoseconds per day. Here we present an initial evaluation of the three main systematic frequency shifts

The Superconductive Critical Magnetic Field of Beryllium

October 16, 2008
Author(s)
Robert J. Soulen, J H. Colwell, William E. Fogle
… purest sample studied, T c =24.34 0.02 mK, H c (O) = 107.7 0.2 T and (γ/V) = 329 1.3 ergs/cm 3 K 2 . By extrapolation … that the critical parameters for pure Be are: T c = 24.44 mK, H c (O) = 108.1 T and (γ/V) =330 ergs/cm 3 K 2 . …

N-Nitrosation of Amines by NO 2 and NO: A Theoretical Study

March 22, 2007
Author(s)
Yi-Lei Zhao, Stephen L. Garrison, Carlos A. Gonzalez, William D. Thweatt, M Marquez
… reactive: aziridine (?H? = 74 kJ/mol), piperidine (?H? = 44 kJ/mol), azetidine (?H? = 44 kJ/mol), and pyrrolidine (?H? = 30 kJ/mol). The reaction …
Displaying 201 - 225 of 1600
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