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Displaying 19801 - 19825 of 74186

Effect of Impurities on Water Triple Point Cells

July 15, 2014
Author(s)
A Peruzzi, J. van Geel, A. Uytun, M. Kalemci, E. Uysal, Gregory F. Strouse, Yoana Y. Nuevo Ordonez, William Davis
Water triple point cells are the basis for the definition of the Kelvin and for the realization of the International Temperature Scale of 1990. The temperature differences between the cells are mainly caused by impurities arising in the cell water from the

Mode competition and anomalous cooling in a multimode phonon laser

July 15, 2014
Author(s)
Utku Kemiktarak, Michael Metcalfe, Mathieu Durand, John R. Lawall
We study mode competition in a multimode “phonon laser” comprised of a Fabry-Perot cavity employing a highly reflective membrane as the output coupler. Mechanical gain is provided by driving the cavity with a blue-detuned pump laser, and many mechanical

Superconducting nanowire single photon detectors fabricated from an amorphous Mo0.75Ge0.25 thin-film

July 15, 2014
Author(s)
Varun B. Verma, Adriana E. Lita, Michael R. Vissers, Francesco Marsili, David P. Pappas, Richard P. Mirin, Sae Woo Nam
We present the characteristics of superconducting nanowire single photon detectors (SNSPDs) fabricated from amorphous Mo0.75Ge0.25 thin -films. Fabricated devices show a saturation of the internal detection efficiency at temperatures below 1 K, with system

Kinetic Trapping of D 2 in MIL-53(AL) Observed using Neutron Scattering

July 14, 2014
Author(s)
Rachel Ann Pollock, Jae-Hyuk Her, Craig Brown, Yun Liu, Anne Dailly
We have studied gas adsorption effects on the structure of a metal organic framework, MIL-53(Al), a material well known due to the controllable framework 'breathing¿ phenomenon. Neutron powder diffraction between 4 K and 77 K and up to 4.5 bar pressure D 2

Post-Irradiation Study of the Alanine Dosimeter

July 14, 2014
Author(s)
Marc F. Desrosiers
Post-irradiation stability of high-dose dosimeters has traditionally been an important measurement influence quantity. Though the exceptional stability of the alanine dosimeter response with time has rendered this factor a non-issue for routine work, the

Statistical Models and Computation to Evaluate Measurement Uncertainty

July 11, 2014
Author(s)
Antonio M. Possolo
In the course of the twenty years since the publication of the GUM, the recognition has been steadily growing, of the value that statistical models and statistical computing bring to the evaluation of measurement uncertainty, and of how they enable its

Direct Measurement of Hydrogen Dislocation Pipe Diffusion in Deformed Polycrystalline Pd using Quasielastic Neutron Scattering

July 10, 2014
Author(s)
Brent J. Heuser, Dallas R. Trinkle, Niina Jalarvo, Joseph Serio, Eugene Mamontov, Madhu Sudan Tyagi
The temperature-dependent diffusivity D(T) of hydorgen solute atoms trapped at dislocations - dislocation pipe diffusion of hydorgen - in deformed polycrystalline PdH x(x'0 -3[H]/[Pd] has been quantified with quasi-elastic neutron scattering (QENS) between

Experimental measurements and noise analysis of a cryogenic radiometer

July 10, 2014
Author(s)
Solomon I. Woods, Timothy M. Jung, Adriaan C. Carter, Raju V. Datla , Stephen M. Carr
A cryogenic radiometer device, intended for use as part of an electrical-substitution radiometer, was measured at low temperature. The device consists of a receiver cavity mechanically and thermally connected to a temperature-controlled stage through a

Non-local propagation of correlations in long-range interacting quantum systems

July 10, 2014
Author(s)
Phil Richerme, Zhexuan Gong, Aaron Lee, Crystal Senko, Jacob Smith, Michael S. Foss-Feig, Spyridon Michalakis, Alexey Gorshkov, Christopher Monroe
The maximum speed with which information can propagate in a quantum many-body system directly affects how quickly disparate parts of the system can become correlated and how difficult the system will be to describe numerically. For systems with only short

Release of NIST Interagency Report 7946, CVSS Implementation Guidance

July 10, 2014
Author(s)
Harold Booth, Joshua M. Franklin, Larry Feldman, Greg Witte
The Common Vulnerability Scoring System (CVSS) is an open standard designed to convey severity and risk of information system vulnerabilities. CVSS was commissioned by the National Infrastructure Advisory Council (NIAC) in support of the global

Spectral Emissivity Measurements

July 10, 2014
Author(s)
Hiromichi Watanabe, Juntaro Ishii, Hidenobu Wakabayashi, Tomoyuki Kumano, Leonard Hanssen
Chapter 9 describes the wide variety of experimental instrumentation and methods used for spectral emissivity measurements at both ambient and elevated temperatures, along with specific examples of materials studied. There are a number of measurement

Trapping atoms using nanoscale quantum vacuum forces

July 10, 2014
Author(s)
Jacob M. Taylor, Darrick E. Chang, Kanupriya Sinha, H J. Kimble
Quantum vacuum forces dictate the interaction between individual atoms and dielectric surfaces at nanoscale distances. For example, their large strengths typically overwhelm externally applied forces, which makes it challenging to controllably interface

A Stiffness Model for Control and Analysis of a MEMS Hexapod Nanopositioner

July 9, 2014
Author(s)
Hongliang Shi, Hai-Jun Su, Nicholas Dagalakis
This paper presents a stiffness based kinematic model for analysis and control of a MEMS flexure-based hexapod nanopositioner that was previously built by the National Institute of Standards and Technology (NIST). This nanopositioner is capable of

Structures and thermoelectric properties of double-filled (CaxCe1-x)Fe4Sb12 skutterudites

July 9, 2014
Author(s)
Yonggao Y. Yan, Winnie Wong-Ng, James A. Kaduk, Matthew Suchomel, Xiang Sun, Gangjian Tan, Xinfeng Tang, Lan (. Li, Igor Levin
The structures and thermoelectric properties of double-filled (CaxCe1-x)Fe4Sb12 series (x=0, 0.25, 0.5, 0.75, and 1) have been investigated using the combination of experimental and computational approaches. Structural analysis shows that single phases of

Sustainable Manufacturing Program Workshop Report

July 9, 2014
Author(s)
Sudarsan Rachuri, Katherine C. Morris, Utpal Roy, David Dornfeld, Soundar Kumara
The National Institute of Standards and Technology (NIST)’s Sustainable Manufacturing Program held a workshop on November 13-14, 2012, in Gaithersburg, MD. Dr. Shyam Sunder, Director of NIST’s Engineering Laboratory, initiated the workshop proceedings. In

Chapter 10: Color and Appearance

July 8, 2014
Author(s)
Maria E. Nadal, Clarence J. Zarobila
This chapter will cover the topic of color and appearance measurements. These measurements essentially constitute a specific example of the measurements described in previous chapters; except that they are performed in the specific wavelength range sensed
Displaying 19801 - 19825 of 74186
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