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Search Publications

NIST Authors in Bold

Displaying 10876 - 10900 of 74019

Geometric contributions to chopper wheel optical attenuation uncertainty

December 9, 2017
Author(s)
Matthew T. Spidell, Joshua A. Hadler, Michelle S. Stephens, John H. Lehman, Paul A. Williams
Calibrated reflective optical choppers are used in NIST’s high power laser calibration services due to their advantages in performance and safety over wedges and semi-transparent materials for beam power reduction. While the design, operation, and

Influence of Substrate Moisture State and Roughness on Interface Microstructure and Bond Strength: Slant Shear vs. Direct Tension Testing

December 8, 2017
Author(s)
Dale P. Bentz, Igor de la Varga, Jose Munoz, Robert Spragg, Benjamin Graybeal, Daniel S. Hussey, David L. Jacobson, Scott Z. Jones, Jacob M. LaManna
There are conflicting views in the literature concerning the optimum moisture state for an existing substrate prior to the application of a repair material. Both saturated-surface-dry (SSD) and dry substrates have been found to be preferable to the other

Dependence of transition width on current and critical current in transition-edge sensors

December 7, 2017
Author(s)
Kelsey M. Morgan, Christine G. Pappas, Douglas A. Bennett, Johnathon D. Gard, James P. Hays-Wehle, Gene C. Hilton, Carl D. Reintsema, Daniel R. Schmidt, Joel N. Ullom, Daniel S. Swetz
If transition-edge sensor (TES) X-ray detectors are to be useful in photon-rich environments,they must maintain high resolving power when pulse durations are engineered to be short, which is usually accomplished by increasing the thermal conductance (G)to

L-Edge Spectroscopy of Dilute, Radiation-Sensitive Systems Using a Transition-Edge-Sensor Array

December 7, 2017
Author(s)
Daniel S. Swetz, William B. Doriese, Joseph W. Fowler, Johnathon D. Gard, Gene C. Hilton, Kelsey M. Morgan, Galen C. O'Neil, Joel N. Ullom
We present X-ray absorption spectroscopy and resonant inelastic X-ray scattering (RIXS) measurements on the iron L-edge of 0.5 mM aqueous ferricyanide. These measurements demonstrate the ability of high-throughput transition- edge-sensor (TES)

New Insights into the Flow and Microstructural Relaxation Behavior of Biphasic Cellulose Nanocrystal Dispersions from RheoSANS

December 7, 2017
Author(s)
Alexander D. Haywood, Kathleen Weigandt, Partha Saha, Matthew Noor, Micha J. Green, Virginia A. Davis
Understanding microstructure and shear response is a prerequisite for the controlled and predictable assembly of anisotropic nanomaterials into large area structures. Much of the framework for understanding the rheological behavior of lyotropic dispersions

Stateful characterization of resistive switching TiO2 with electron beam induced currents

December 7, 2017
Author(s)
Brian D. Hoskins, Gina C. Adam, Evgheni Strelcov, Nikolai B. Zhitenev, Andrei A. Kolmakov, Dmitri B. Strukov, Jabez J. McClelland
Metal oxide resistive switches have become increasingly important as possible artificial synapses in next generation neuromorphic networks. Nevertheless, there is still no codified set of tools for studying fundamental properties of the devices. To this

Evaluating the Hydration of High Volume Fly Ash Mixtures Using Chemically Inert Fillers

December 6, 2017
Author(s)
Igor de la Varga, Javier Castro, Dale P. Bentz, Franco Zunino, Jason Weiss
Fly ash is frequently used as a replacement for cement in concrete. However, questions remain regarding the influence that fly ash has on the hydration of cement. This paper examines physical aspects (e.g., surface nucleation, cement particles spacing) and

Nanoscale Particle Motion in Attractive Polymer Nanocomposites

December 6, 2017
Author(s)
Erkan NMN Senses, Suresh Narayanan, Yimin NMN Mao, Antonio Faraone
Using x-ray photon correlation spectroscopy, we examined slow nanoscale motion of silica nanoparticles individually dispersed in entangled poly (ethylene oxide) melt at particle volume fractions up to 42%. The nanoparticles, therefore, serve as both

Towards Replacing Resistance Thermometry with Photonic Thermometry

December 6, 2017
Author(s)
Nikolai Klimov, Thomas P. Purdy, Zeeshan Ahmed
Resistance thermometry provides a time-tested method for taking temperature measurements that has been painstakingly developed over the last century. However, fundamental limits to resistance-based approaches along with a desire to reduce the cost of

Users Guide to HVAC-Cx v2.2

December 6, 2017
Author(s)
Michael A. Galler, Natascha S. Milesi-Ferretti
HVAC-Cx is a software tool designed to facilitate performance analysis for mechanical equipment buildings. It is used for ongoing monitoring and provides the ability to detect faults related to improper operation, using expert rules to present results of

Correspondence: Phantom Phonon Localization in Relaxors

December 5, 2017
Author(s)
Peter M. Gehring, Daniel E Parshall, Leland Weldon Harriger, Christopher Stock, Guangyong Xu, Xiaobing Li, Haosu Luo
Manley et al. (Ref. [1]) report the observation of an unexpected, weak, phonon mode located in energy between that of the transverse acoustic (TA) and soft transverse optic (TO) modes in the relaxor ferroelectric Pb[(Mg0.33Nb0.67)1-xTix]O3 (PMN-xPT) with

Role of Materials Science in the Resilience of the Built Environment

December 5, 2017
Author(s)
Stephanie S. Watson, Chiara C. Ferraris, Jason D. Averill
The resilience of U.S. communities, defined as the "ability to withstand and recover rapidly from disruptive events," is directly dependent upon the ability of the built environment to maintain and support the functions upon which modern society has come

Spatial Distribution of Hydrophobic Drugs in Model Nanogel-core Star Polymers

December 5, 2017
Author(s)
Vivek M. Prabhu, Guangmin Wei, Robert D. Miller, Victoria A. Piunova, William Swope, Amber Carr
Star polymers with a cross-linked nanogel-core are promising carriers of cargo for therapeutic applications due the synthetic control of amphiphilicity of arms and the stability to infinite dilution. Three nanogel-core star polymers were investigated to

Structural Basis for the Inhibitory Effects of Ubistatins in the Ubiquitin-Proteasome Pathway

December 5, 2017
Author(s)
Mark A. Nakasone, Timothy A. Lewis, Olivier Walker, Anita Thakur, Wissam Mansour, Carlos A. Castaneda, Jennifer L. Goeckeler-Fried, Frank Parlati, Tsui-Fen Chou, Ortal Hayat, Daoning Zhang, Christina M. Camara, Steven M. Bonn, Urszula K. Nowicka, Susan T. Krueger, Michael H. Glickman, Jeffrey L. Brodsky, Raymond J. Deshaies, David Fushman
The success of proteasome inhibitors has led to intense efforts to discover points of therapeutic intervention for nearly every component of the ubiquitin-proteasome system. The discovery of ubistatins, small molecules that inhibit proteasomal degradation

An Examination of National Supply-Chain Flow Time

December 4, 2017
Author(s)
Douglas Thomas, Anand M. Kandaswamy
The US and other national governments invest in research and development to spur competitiveness in their domestic manufacturing industries. However, there are limited studies on identifying the research efforts that will have the largest possible return

Efimov States of Strongly Interacting Photons

December 4, 2017
Author(s)
Jacob M. Taylor, Alexey V. Gorshkov, Michael Gullans, D Ruzik, Seth Rittenhouse, J.P. D'Incao, Paul Julienne, S Diehl
We introduce a new system to study Efimov physics based on interacting photons in cold gases of Rydberg atoms. This system has a large anisotropy between the longitudinal mass of the photons, arising from dispersion, and the transverse mass of the photons
Displaying 10876 - 10900 of 74019