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Displaying 926 - 950 of 1005

Shrinks When It's Colder

August 1, 2022
Author(s)
Patrick Egan
… which has a nominal thermal expansion coefficient of 0.4 (µm/m)/K. Therefore, to scale the accuracy of the … inhomogeneity in thermal expansion among samples is 17 times larger than the measurement uncertainty in a single …

Terahertz-Rate Kerr-Microresonator Optical Clockwork

August 12, 2019
Author(s)
Tara E. Drake, Travis Briles, Daryl T. Spencer II, Jordan R. Stone, David R. Carlson, Daniel D. Hickstein, Qing Li, Daron A. Westly, Kartik A. Srinivasan, Scott A. Diddams, Scott B. Papp
… presented here is based on a silicon-nitride (Si$_3$N$_4$) photonic circuit that produces a microresonator comb … By electro- optic phase modulation of the entire Si$_3$N$_4$ comb, we arbitrarily generate additional continuous-wave … of this Kerr-microresonator clockwork to one part in $10^{17}$, which introduces the possibility of using Kerr combs …

Status Report on the First Round of the NIST Post-Quantum Cryptography Standardization Process

January 31, 2019
Author(s)
Gorjan Alagic, Jacob M. Alperin-Sheriff, Daniel Apon, David Cooper, Quynh H. Dang, Carl Miller, Dustin Moody, Rene Peralta, Ray Perlner, Angela Robinson, Daniel Smith-Tone, Yi-Kai Liu
… and key-establishment algorithms to augment FIPS 186-4, Digital Signature Standard (DSS), as well as special … moving forward to the second round of the competition. The 17 Second-Round Candidate public-key encryption and …

A Versatile Technique to Enable Sub-Milli-Kelvin Instrument Stability for Precise Radial Velocity Measurements: Tests with the Habitable-Zone Planet Finder

December 16, 2016
Author(s)
Ryan C. Terrien, Guomundur K. Stefansson, Fred Hearty, Paul Robertson, Suvrath Mahadevan, Tyler Anderson, Chad Bender, Matthew Nelson, Andrew Monson, Basil Blank, Samuel Halverson, Chuck Henderson, Lawrence Ramsey, Arpita Roy, Christian Schwab
Insufficient instrument thermo-mechanical stability is one of the fundamental roadblocks for achieving 10 cm s −1 Doppler radial velocity (RV) precision, the precision needed to detect Earth-twins orbiting Solar-type stars. Exquisite temperature and

Movement on Stairs During Building Evacuations

June 8, 2016
Author(s)
Richard D. Peacock, Paul A. Reneke, Erica D. Kuligowski, Robert C. Hagwood
The time that it takes an occupant population to reach safety when descending a stair during building evacuations is typically estimated by measureable engineering variables such as stair geometry, speed, stair density, and pre-observation delay. In turn

Injectable Calcium Phosphate Cement: Effects of Powder-to-Liquid Ratio and Needle Size

July 16, 2007
Author(s)
Elena F. Burguera, Hockin D. Xu, Limin Sun
… effect on injection. The injection force (mean sd; n = 4) significantly increased from (8 2) N using the 10-gauge needle to (144 17) N using the 21-gauge needle (Tukey s at p of 0.05). Varying the powder/liquid mass ratio from 2 to 4 also had a significant effect on injection. Using the …
Displaying 926 - 950 of 1005
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