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Displaying 22901 - 22925 of 74202

Near-infrared calibration systems for precise radial-velocity measurements

September 24, 2012
Author(s)
Stephen L. Redman, Florian Kerber, Gillian Nave, Suvrath Mahadevan, Lawrence W. Ramsey, Jonathan Smoker, H-U Kaufl, Pedro Figueira
We present work done to prepare two new near-infrared calibration sources for use on high-precision astrophysical spectrographs. Uranium-neon is an atomic calibration source, commercially available as a hollow-cathode lamp, with over 10 000 known emission

Radiation Pattern of an UWB Wearable Antenna: A Preliminary Study

September 24, 2012
Author(s)
Wen-Bin Yang, Kamran Sayrafian
Inhomogeneity of the propagation medium in body area networks could have a great impact on the sensor node's antenna characteristics. This in turn could affect the quality of the communication links unless the impact of the human body has been properly

The Habitable-Zone Planet Finder: A Stabilized Fiber-Fed NIR Spectrograph for the Hobby-Eberly Telescope

September 24, 2012
Author(s)
Scott A. Diddams, Suvrath Mahadevan, Lawrence W. Ramsey, Chad F. Bender, Ryan Terrien, Jason T. Wright, Samuel Halverson, Fred Hearty, Matthew Nelson, Adam Burton, Stephen L. Redman, Steve Osterman, James Kasting, Michael Endl
We present the scientific motivation and conceptual design for the recently funded Habitable-zone Planet Finder (HPF), a stabilized fiber-fed near-infrared (NIR) spectrograph for the 10 meter class Hobby-Eberly Telescope(HET) that will be capable of

Characterization and In-situ Monitoring of Sub-stoichiometric Adjustable TC Titanium Nitride Growth

September 21, 2012
Author(s)
Michael R. Vissers, Jiansong Gao, Jeffrey S. Kline, Martin O. Sandberg, Martin P. Weides, David S. Wisbey, David P. Pappas
The structural and electrical properties of Ti-N films deposited by reactive sputtering depend on their growth parameters, in particular the Ar:N2 gas ratio. We show that the nitrogen percentage changes the crystallographic phase of the film progressively

Development of a fully automated LED lifetime test system

September 21, 2012
Author(s)
Yuqin Zong, Jeff Hulett
A fully automated system for light-emitting diode (LED) lifetime test has been developed and is undergoing validation. This system uses a 1 m integrating sphere for both aging and optical measurements of 480 LEDs. It features six test zones, each of which

PEG-Labeled Nucleotides and Nanopore Detection for Single Molecule DNA Sequencing by Synthesis

September 21, 2012
Author(s)
Shiv Kumar, Tao Chuanjuan, Chien Minchen, Hellner Brittney, Joseph W. Robertson, Arvind Balijepalli, Li Zengmin, James J. Russo, Joseph E. Reiner, John J. Kasianowicz, Jingyue Ju
There is a significant need to accurately sequence single DNA and RNA molecules for personalized medicine. We describe a novel nanopore-based sequencing by synthesis (SBS) strategy that will accurately differentiate at single molecule level four different

Anomalous Friction in Suspended Graphene

September 20, 2012
Author(s)
Alexander Y. Smolyanitsky, Jason P. Killgore
Since the discovery of the Amonton's law and with support of modern tribological models, friction between surfaces of three-dimensional materials is known to generally increase when the surfaces are in closer contact. Here, using molecular dynamics

Concentration Measurement of Length-Fractionated Colloidal Single-Wall Carbon Nanotubes

September 20, 2012
Author(s)
Constantine Y. Khripin, Xiaomin X. Tu, John Howarter, Jeffrey A. Fagan, Ming Zheng
Determination of the colloid concentration for a given single-wall carbon nanotube (SWCNT) dispersion is a basic requirement for many studies. The commonly used optical absorption based concentration measurement is complicated by the spectral change due to

Dieseline for Supercritical Injection and Combustion in Compression-Ignition Engines: Volatility, Phase Transitions, Spray/Jet Structure, and Thermal Stability

September 20, 2012
Author(s)
George Anitescu, Thomas J. Bruno, Lawrence L. Tavlarides
To optimize the injection-combustion process of increasingly diversified fuels, thermophysical and chemical properties of new blends are required over wide range of compositions and P-T conditions, including supercritical (SC) states. In this study, the

Dieseline for Supercritical Injection and Combustion in Compression-Ignition Engines: Volatility, Phase Transitions, Spray/Jet Structure, and Thermal Stability

September 20, 2012
Author(s)
Thomas J. Bruno, George G. Anitescu, Lawrence L. Tavlarides
To optimize the injection-combustion process of increasingly diversified fuels, thermophysical and chemical properties of new blends are required over wide range of compositions and P-T conditions, including supercritical (SC) states. In this study, the

Mg-Fe Thin Films: A Phase-separated Structure with Fast Kinetics of Hydrogenation

September 20, 2012
Author(s)
Shiyou Zheng, Ke Wang, Vladimir Oleshko, Leonid A. Bendersky
In this paper we suggest a new approach to improve the kinetics of hydrogenation based on a material with high density of interfaces between hydride-forming solid (HFS) and hydrogen-diffusing solid media (HDM). Such materials can be realized for phase

Program Handbook for Engine Fuel, Petroleum and Lubricant Laboratories

September 20, 2012
Author(s)
Kenneth S. Butcher
This handbook provides guidance to extablish a management system of State Fuel Quality Laboratories (FQL) using the International Organization for Standardization (ISO) International Electrotechnical Commission (IEC) ISO/IEC 17025:2005, "General

Evacuation of People with Disabilities on Stairs

September 18, 2012
Author(s)
Erica D. Kuligowski, Bryan Hoskins, Richard D. Peacock, Emily A. Wiess
The time that it takes a population to reach safety when descending a stairwell during building evacuations is typically described by measureable engineering variables. These engineering variables include stairwell geometry, speed, density, and pre

Evidence for Anisotropic Polar Nanoregions in Relaxor Pb(Mg 1/3} Nb 2/3} )O 3 : A Neutron Study of the Elastic Constants and Anomalous TA Phonon Damping in PMN

September 18, 2012
Author(s)
Christopher K. Stock, Peter M. Gehring, H. Hiraka, I. Swainson, Guangyong Xu, Z.-G. Ye, J.-F. Li, D. Viehland
We use neutron inelastic scattering methods to characterize the acoustic phonons in the relaxor Pb(Mg 1/3}Nb 2/3})O 3 (PMN) and demonstrate the presence of a highly anisotropic damping mechanism that is directly related to short-range, polar correlations

Gradient-based stopping rules for maximum-likelihood quantum-state tomography

September 18, 2012
Author(s)
Scott C. Glancy, Emanuel H. Knill, Mark Girard
When performing maximum likelihood quantum state tomography, one must find the quantum state that maximizes the likelihood for observed measurements on identically prepared systems, all having that quantum state. This optimization is usually performed with

More Thoughts on Defaults

September 18, 2012
Author(s)
Steve M. Gwynne, Erica D. Kuligowski, Michael Spearpoint
In this paper, the use of default values in egress models is explored and specific values are proposed to combat issues of model misuse. The authors suggest that defaults should represent the most credibly conservative estimates available for core egress
Displaying 22901 - 22925 of 74202
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