U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 14951 - 14975 of 73893

Entropy Theory of Polymer Glass-Formation in Variable Spatial Dimension

December 20, 2016
Author(s)
Jack F. Douglas, Wensheng Xu, Karl Freed
The importance of packing frustration is broadly appreciated to be an important aspect of glass formation. Recently, great interest has focused on probing the dependence on spatial dimension d as a theoretical tool for exploring essential aspects of glass

Identification of the Low-Energy Excitations in a Quantum Critical System

December 20, 2016
Author(s)
Tom Heitmann, Jagat Lamsal, Shannon M. Watson, Ross Erwin, Wangchun Chen, Yang Zhao, Wouter Montfrooij
We have identified low-energy magnetic excitations in a doped quantum critical system by means of polarized neutron scattering experiments. The presence of these excitations could explain why Cd(Fe 0.76Ru 0.24) 2Ge 2 displays dynamical scaling in the

Resilience and System Level Security

December 20, 2016
Author(s)
Mark L. Badger
One approach for reducing damage caused by software vulnerabilities is to take advantage of emerging systems architecture patterns to strategically improve assurance. Emerging systems architectures embody significant choices about where computation takes

Certification of New Standard Reference Material 2806b Medium Test Dust in Hydraulic Oil

December 19, 2016
Author(s)
Robert A. Fletcher, Nicholas W. Ritchie, David S. Bright, James J. Filliben, William F. Guthrie
A new material has been certified to become Standard Reference Material (SRM) 2806b - Medium Test Dust in Hydraulic Fluid. SRM 2806b consists of a trace polydisperse, irregularly shaped mineral dust particles suspended in hydraulic fluid. The certified

General Methods for Access Control Policy Verification

December 19, 2016
Author(s)
Chung Tong Hu, David R. Kuhn
Access control systems are among the most critical of computer security components. Faulty policies, misconfigurations, or flaws in software implementations can result in serious vulnerabilities. To formally and precisely capture the security properties

Introduction to the special issue on small-angle scattering

December 19, 2016
Author(s)
Michael Gradzielski, Andrew J. Allen
This is the foreword for a Special Issue of the Journal of Applied Crystallography on Small-Angle Scattering. This special issue collects together full-length peer-reviewed research papers in association with the 15th International Conference on Small

Memory and Motor Processes of Password Entry Error

December 19, 2016
Author(s)
Frank Tamborello, Kristen K. Greene
Passwords are tightly interwoven with the digital fabric of our current society. Unfortunately, passwords that provide better security generally tend to be more complex, both in length and composition. Complex passwords are problematic both cognitively and

The Use of Antioxidants to Improve Vapor Pressure Measurements on Compounds with Oxidative Instability: Methyl Oleate with tert-Butylhydroquinone

December 19, 2016
Author(s)
Jason A. Widegren, Casey E. Beall, Audrey E. Tolbert, Tara M. Lovestead, Thomas J. Bruno
The vapor pressure (psat) of methyl oleate was measured with and without the addition of 0.2 mass % of the antioxidant stabilizer tert-butylhydroquinone (TBHQ). The measurements were made by the gas saturation method in the temperature range (303.15 to 343

Particle shape effects on particle size measurement for crushed waste glass

December 18, 2016
Author(s)
Kyle Riding, Mohammadreza Mirzohosseini, Edward Garboczi
Recently, narrow particle size distributions, as measured by sieve analysis, of crushed waste glass were used as a replacement for Portland cement in concrete. Their chemical reactivity was successfully studied as a function of this measure of particle

Analytical Multimode Scanning and Transmission Electron Imaging and Tomography of Multiscale Structural Architectures of Sulfur Copolymer-Based Composite Cathodes for Next Generation High-Energy Density Li-S Batteries

December 17, 2016
Author(s)
Vladimir P. Oleshko, Andrew A. Herzing, Christopher L. Soles, Jared J. Griebel, Woo J. Chung, Adam G. Simmonds, Jeff Pyun
Poly(sulfur-random-(1,3-diisopropenylbenzene) copolymers synthesized via inverse vulcanization represent an emerging class of electrochemically active polymers recently used in cathodes for Li-S batteries, capable of realizing enhanced capacity retention

A Versatile Technique to Enable Sub-Milli-Kelvin Instrument Stability for Precise Radial Velocity Measurements: Tests with the Habitable-Zone Planet Finder

December 16, 2016
Author(s)
Ryan C. Terrien, Guomundur K. Stefansson, Fred Hearty, Paul Robertson, Suvrath Mahadevan, Tyler Anderson, Chad Bender, Matthew Nelson, Andrew Monson, Basil Blank, Samuel Halverson, Chuck Henderson, Lawrence Ramsey, Arpita Roy, Christian Schwab
Insufficient instrument thermo-mechanical stability is one of the fundamental roadblocks for achieving 10 cm s −1 Doppler radial velocity (RV) precision, the precision needed to detect Earth-twins orbiting Solar-type stars. Exquisite temperature and

Bound Layers Cloak Nanoparticles in Strongly Interacting Polymer Nanocomposites

December 16, 2016
Author(s)
Jack F. Douglas, Francis W. Starr, Sanat K. Kumar
Polymer-nanoparticle (NP) interfacial interactions are expected to strongly influence the properties of nanocomposites, but surprisingly, experiments often report small or no changes in the glass transition temperature, Tg. To understand this paradoxical

Decoupling of a Neutron Interferometer from Temperature Gradients

December 16, 2016
Author(s)
Michael G. Huber, Muhammad D. Arif, P. Saggu, T. Mineeva, David Cory, Robert Haun, Ben Heacock, K Li, J. Nsofini, D. Sarenac, Chandra Shahi, V Skavysh, Mike Snow, S. Werner, A.R. Young, Dmitry Pushin
Neutron interferometry enables precision measurements that are typically operated within elaborate, multi-layered facilities which provide substantial shielding from environmental noise. These facilities are necessary to maintain the coherence requirements

Effect of oxygen pressure on structure and ionic conductivity of epitaxial Li0.33La0.55TiO3 solid electrolyte thin films produced by pulsed laser deposition

December 16, 2016
Author(s)
Leonid A. Bendersky, Bharathi Kamala, Haiyan Tan, Saya Takeuchi, Haoting Shen, Jongmoon Shin, I. Takeuchi
We report on the ionic conductivity and the effect of oxygen partial pressure during the growth of Li0.33La0.55TiO3 (LLTO) epitaxial films grown on SrTiO3 (STO) (100) and (111) substrates and explore some distinct conductivity behavior. The films are

Floating Zone Growth of a-Na 0.90 MnO 2 Single Crystals

December 16, 2016
Author(s)
Rebecca Dally, Raphaele Clement, Robin Chisnell, Stephanie Taylor, Megan Butala, Vicky Doan-Nguyen, Mahalingam Balasubramanian, Jeffrey W. Lynn, Clare P. Grey, Stephen D. Wilson
Single crystal growth of α-Na xMnO 2 (x=0.90) is reported via the floating zone technique. The conditions required for stable growth and intergrowth-free crystals are described along with the results of trials under alternate growth atmospheres. Chemical

Measurements and Scoring Procedures for Footwear Impression Comparisons

December 16, 2016
Author(s)
Martin Herman
A software system under development at NIST, called SHOECALC, will be described. It is designed to help both researchers and footwear examiners in the assessment of metrics or scoring procedures that provide objective characterizations of correspondences

Separation, Sizing, and Quantitation of Engineered Nanoparticles in an Organism Model Using Inductively Coupled Plasma Mass Spectrometry and Image Analysis

December 16, 2016
Author(s)
Monique E. Johnson, Shannon Hanna, Antonio R. Montoro Bustos, Christopher M. Sims, Lindsay C. Elliott, Babak Nikoobakht, John T. Elliott, Richard D. Holbrook, Keana C. Scott, Karen E. Murphy, Elijah J. Petersen, Lee L. Yu, Bryant C. Nelson, Akshay Lingayat, Adrian C. Johnston
For environmental studies assessing uptake of orally ingested engineered nanoparticles (ENPs), a key step in ensuring accurate quantification of ingested ENPs is efficient separation of the organism from ENPs that are either nonspecifically adsorbed to the
Displaying 14951 - 14975 of 73893
Was this page helpful?