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Displaying 36526 - 36550 of 143721

Framework for Improving Critical Infrastructure Cybersecurity, Version 1.0

February 12, 2014
Author(s)
Adam Sedgewick
The national and economic security of the United States depends on the reliable functioning of critical infrastructure. Cybersecurity threats take advantage of the increased complexity and connectivity of critical infrastructure systems, placing the Nation

Polarized 3HE Spin Filters for Neutron Science

February 12, 2014
Author(s)
Thomas R. Gentile, Wei-Chen N. Chen
The large spin dependence of the absorption cross section for neutrons by 3He gas provides a method to polarize neutron beams. For certain applications, such polarized 3He-based neutron "spin filters" have advantages over conventional neutron optical

Environmental Health in Low Energy Buildings Topic Overview

February 11, 2014
Author(s)
Steven J. Emmerich, Hal Levin
Besides providing thermal comfort and acceptable indoor environmental quality (IEQ), the designers of buildings and other enclosed spaces are increasingly challenged to provide a healthy environment in an energy efficient manner. Increasing pressure to

The IAQ and Energy Impacts of Reducing Formaldehyde Emissions in Commercial Building

February 11, 2014
Author(s)
Lisa C. Ng, Andrew K. Persily, Steven J. Emmerich, Kevin Y. Teichman
Heating, ventilating, and air conditioning (HVAC) systems in buildings are designed to provide thermally comfortable conditions and to maintain acceptable indoor air quality (IAQ). At the same time, the operating costs of HVAC systems are often a large

Bloch oscillations collapse and revival of interacting bosons in an optical lattice

February 10, 2014
Author(s)
Khan W. Mahmud, Lei Jiang, Eite Tiesinga, Philip Johnson
We study the dynamics of interacting superfluid bosons in a one dimensional vertical optical lattice after a sudden increase of the lattice potential depth. We show that this system can be exploited to investigate the effects of strong interactions on

Filter Material Effects on Particle Absorption Characteristics

February 10, 2014
Author(s)
Cary Presser, Joseph M. Conny, Ashot Nazarian
The absorption coefficient and mass specific absorption cross section were determined for nigrosin-laden quartz, Teflon, and polycarbonate filters in inert surroundings at different steady-state temperatures and particle mass loadings. The objective was to

The U.S. Manufacturing Value Chain: An International Perspective

February 10, 2014
Author(s)
Douglas Thomas
This report uses input-output data from the World Input-Output Database along with the methods developed by Wassily Leontief to track the intermediate goods and services used in national manufacturing industries. Specifically, it examines the extent that

Ultrafast optical properties of lithographically defined quantum dot amplifiers

February 10, 2014
Author(s)
Luis Miaja Avila, Varun B. Verma, James J. Coleman, Richard P. Mirin, Kevin L. Silverman
We measure the ultrafast optical response of lithographically defined quantum dot amplifiers at 40 K. Recovery of the gain mostly occurs in less than 1 picosecond, with some longer-term transients attributable to carrier heating. Recovery of the absorption

Properties of TiN for Detector and Amplifier Applications

February 8, 2014
Author(s)
Jiansong Gao, Michael R. Vissers, Martin O. Sandberg, Dale Li, Hsiao-Mei Cho, Clint Bockstiegel, Ben Mazin, Henry G. Leduc, Saptarshi Chaudhuri, David P. Pappas, K D. Irwin
We have experimentally explored and carefully characterized the important properties of TiN, including the resistivity, nonlinear kinetic inductance, the anomalous electro-dynamical response, and the two-level-system induced frequency shift and noise. We

Compressed-liquid Density Measurements of Three Alternative Turbine Fuels

February 7, 2014
Author(s)
Stephanie L. Outcalt
Compressed-liquid densities of three alternative turbine fuels have been measured. The measurements were made from 270 K to 470 K, and 0.5 MPa to 50 MPa. The data have been correlated with a Tait equation, and parameters are given for each fuel. Results of

Graphene-on-dielectric micromembrane for optoelectromechanical hybrid devices

February 7, 2014
Author(s)
Jacob M. Taylor, Silvan Schmid, Tolga Bagci, Emil Zeuthen, Patrick Herring, Maja Cassidy, C. M. Marcus, Bartolo Amato, Anja Boisen, Yong C. Shin, Jing Kong, Anders Sorensen, Koji Usami, E.S. Polzik
Due to their exceptional mechanical and optical properties, dielectric silicon nitride (SiN) mi- cromembranes have become the centerpiece of many optomechanical experiments. Efficient capac- itive coupling of the membrane to an electrical system would

High-accuracy measurement of the black-body radiation frequency shift of the ground-state hyperfine transition in 133 Cs

February 7, 2014
Author(s)
Steven R. Jefferts, Thomas P. Heavner, Thomas E. Parker, Jon H. Shirley, Elizabeth A. Donley, Neil Ashby
We report a high-accuracy direct measurement of the blackbody radiation shift (BBR) of 133Cs ground state hyperfine transition. This frequency shift is one of the largest systematic frequency biases encountered in realizing the current definition of the SI
Displaying 36526 - 36550 of 143721
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