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Displaying 19276 - 19300 of 74483

Performance Ranking of Refrigerants With Low Global Warming Potential

January 7, 2015
Author(s)
Mark A. Kedzierski, J S. Brown, Junemo Koo
This paper evaluates in a typical air-conditioner the cycle performance of thirty-nine refrigerants identified in the AHRI Low Global Warming Potential (GWP) Alternative Refrigerants Evaluation Program (Low-GWP AREP). The Low-GWP AREP was initiated in

Phase steps and resonator detuning measurements in microresonator frequency combs

January 7, 2015
Author(s)
Pascal P. Del'Haye, Aurelien C. Coillet, William Loh, Katja M. Beha, Scott B. Papp, Scott A. Diddams
Significant progress has been made in the last years towards a better understanding and theoretical modeling of Kerr-effect induced generation of optical frequency combs in microresonators. However, the simultaneous interaction of hundreds or thousands of

The meaning of the universal WLF parameters of glass-forming polymer liquids

January 7, 2015
Author(s)
Jack F. Douglas, Jacek Dudowicz, Karl Freed
Although the Williams-Landell-Ferry (WLF) equation for the segmental relaxation time tau of glass forming materials is one of most commonly encountered relations in polymer physics, the molecular basis for this equation is not well understood. The WLF

Dietary Supplement Laboratory Quality Assurance Program: Exercise K Final Report

January 6, 2015
Author(s)
Melissa M. Phillips, Catherine A. Rimmer, Laura J. Wood
The NIST Dietary Supplement Laboratory Quality Assurance Program (DSQAP) was established in collaboration with the National Institutes of Health (NIH) Office of Dietary Supplements (ODS) in 2007 to enable members of the dietary supplements community to

Citrate-stabilized gold nanoparticles do not impact neural progenitor cell development

January 5, 2015
Author(s)
Kavita M. Jeerage, Tammy L. Oreskovic, Alexandra Curtin, Aric W. Sanders, Rani K. Schwindt, Ann C. Chiaramonti Debay
Gold nanoparticles are promising candidates for medical diagnostics and therapeutics, due to their chemical stability, optical properties, and ease of functionalization. Citrate-stabilized gold nanoparticle reference materials also have potential as

Substitution of Ni for Fe in Superconducting Fe 0.98 Te 0.5 Se 0.5 Depresses the Normal-State Conductivity but not the Magnetic Spectral Weight

January 5, 2015
Author(s)
Jinghui Wang, Ruidan Zhong, Shichao Li, Yuan Gan, Zhijun Xu, Cheng Zhang, T Ozaki, M. Matsuda, Yang Zhao, Qiang Li, Guangyong Xu, Genda Gu, J. M. Tranquada, R. J. Birgeneau, Jinsheng Wen
We have performed systematic resistivity and inelastic neutron scattering measurements on Fe 0.98-zNi zTe 0.5Se 0.5 samples to study the impact of Ni substitution on the transport properties and the low-energy (less than or equal to} 12 meV) magnetic

Volumetric Performance Evaluation of a Laser Scanner Based on Geometric Error Model

January 5, 2015
Author(s)
Balasubramanian Muralikrishnan, Massimiliano M. Ferrucci, Daniel S. Sawyer, Grant Gerner, Vincent D. Lee, Christopher J. Blackburn, Steven D. Phillips, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
We discuss a geometric error model for those large volume laser scanners that have the laser source and a spinning prism mirror mounted on a platform that can rotate about the vertical axis. We describe the terms that constitute the model, address their

Proximity-effect test for lossy wireless-device measurements in reverberation chambers

January 4, 2015
Author(s)
Catherine A. Remley, Joop Aan Den Toorn, Christopher L. Holloway, John M. Ladbury, Chih-Ming Wang
We present a test method for quantifying and reducing systematic errors arising from antenna proximity to lossy objects in over-the-air performance testing of lossy large-form-factor wireless devices. The method determines the extent to which antenna

The Second National Ballistics Imaging Comparison (NBIC-2)

January 4, 2015
Author(s)
Theodore Vorburger, James Yen, Jun-Feng Song, Robert Thompson, Thomas Renegar, Xiaoyu Zheng, D Ott, Martin G. Ols
In response to the guidelines issued by the American Society of Crime Laboratory Directors/Laboratory Accreditation Board (ASCLD/LAB-International) to establish traceability and quality assurance in U.S. crime laboratories, NIST and the ATF initiated a

A 4D Immersive Platform to Visualize RF Propagation in BAN

January 1, 2015
Author(s)
John G. Hagedorn, Kamran Sayrafian, Judith E. Terrill, Kamya Yekeh Yazdandoost
Recent advances in micro-electronics technology to build small radio-enabled implantable and wearable medical sensors have sparked considerable interest in body area networks. Understanding the characteristics of radio frequency propagation inside and

Designing a standard for strain mapping: HR-EBSD analysis of SiGe thin film structures on Si

January 1, 2015
Author(s)
Mark D. Vaudin, William A. Osborn, Lawrence H. Friedman, Justin M. Gorham, Robert F. Cook, Victor Vartanian
Patterned SiGe thin film structures, heteroepitaxially deposited on Si substrates, are investigated as potential reference standards to establish the accuracy of high resolution electron backscattered diffraction (HR-EBSD) strain measurement methods. The

How High a Degree is High Enough for High Order Finite Elements?

January 1, 2015
Author(s)
William F. Mitchell
High order finite element methods can solve partial differential equations more efficiently than low order methods. But how large of a polynomial degree is beneficial? This paper addresses that question through a case study of three problems representing

IMPROVING RADIANT HEAT RESISTANCE OF POLYCARBONATE LENSES

January 1, 2015
Author(s)
George C. Braga, Amy Mensch, Nelson P. Bryner
The purpose of this paper is to make a study of the degradation of polycarbonate lenses when submitted to thermal radiations between 5 and 15kW/m2. In addition, it studies how to improve the lenses' thermal resistance by adding a thin reflexive reflective

Materials Development for High Efficiency Superconducting Nanowire Single-Photon Detectors

January 1, 2015
Author(s)
Adriana E. Lita, Varun B. Verma, Robert D. Horansky, Jeffrey M. Shainline, Richard P. Mirin, Sae Woo Nam
Superconducting nanowire single-photon detectors (SNSPDs) based on ultra-thin films have become the preferred technology for applications that require high efficiency single-photon detectors with high speed, high timing resolution, and low dark count rates
Displaying 19276 - 19300 of 74483
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