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Search Publications

NIST Authors in Bold

Displaying 18451 - 18475 of 73697

Microwave Near-Field Imaging of Two-Dimensional Semiconductors

January 27, 2015
Author(s)
Samuel Berweger, Joel Weber, Jimmy J. Li, Jesus M. Velazquez, Adam Pieterick, Norman A. Sanford, Albert V. Davydov, Thomas Mitchell (Mitch) Wallis, Pavel Kabos
Optimizing new generations of 2D devices based on van der Waals materials will require techniques capable of measuring variations in electronic properties in situ and with nanometer spatial resolution. We perform scanning microwave microscopy (SMM) imaging

New Insights into the Prehydration of Cement and Its Mitigation

January 27, 2015
Author(s)
Julyan Stoian, Tandre Oey, Jeffrey W. Bullard, Jian Huang, Aditya Kumar, Magdalena Balonis, Judith E. Terrill, Narayanan Neithalath, Gaurav Sant
Ordinary Portland cement (OPC) prehydrates during storage or handling in moist environments, forming hydration products on or near its particles' surfaces. Prehydration is known to reduce OPC reactivity, but the extent of prehydration has not yet been

Reactor Health Physics Operations at the NIST Center for Neutron Research

January 27, 2015
Author(s)
Thomas P Johnston
Performing health physics and radiation safety functions under a special nuclear material license and a research and test reactor license at a major government research and development laboratory encompasses many elements not encountered by industrial

Defensive code's impact on software performance

January 26, 2015
Author(s)
David W. Flater
Defensive code is instructions added to software for the purpose of hardening it against uncontrolled failures and security problems. It is often assumed that defensive code causes a significant reduction in software performance, which justifies its

Pores in Marcellus Shale: A Neutron Scattering and FIB-SEM Study

January 26, 2015
Author(s)
Xin Gu, David R. Cole, Gernot Rother, David F. Mildner, Susan L. Brantley
Recently, the production of natural gas from black shale has increased dramatically due to the development of hydraulic fracturing techniques which significantly increase the porosity and fracture network of shales. Understanding these processes requires

Preparation of silver nanoparticle loaded cotton threads to facilitate measurement development for textile applications

January 26, 2015
Author(s)
Justin M. Gorham, Karen E. Murphy, Jingyu Liu, Dimitri Tselenchuk, Gheorghe NMN Stan, Thao M. Nguyen, Richard D. Holbrook, Michael R. Winchester, Robert F. Cook, Robert MacCuspie, Vincent A. Hackley
FOREWORD This NIST special publication (SP) is one in a series of NIST SPs that address research needs articulated in the National Nanotechnology Initiative (NNI) Environmental, Health, and Safety Research Strategy published in 2011 [1]. This Strategy

Strong Competition between Orbital-ordering and Itinerancy in a Frustrated Spinel Vanadate

January 26, 2015
Author(s)
J. Ma, J. H. Lee, S. E. Hahn, Tao Hong, H. B Cao, A. A. Aczel, Z. L. Dun, M. B. Stone, W. Tian, Yiming Qiu, John R. Copley, H. D. Zhou, R. S. Fishman, M. Matsuda
The crossover from localized- to itinerant-electron behavior is associated with many intriguing phenomena such as metal-insulator transitions [1], colossal magnetoresistance [2], and superconductivity in heavy fermion [3] and Fe-based materials [4]

Symmetry and Correlations Underlying Hidden Order in URu 2 Si 2

January 26, 2015
Author(s)
Nicholas P. Butch, Michael E. Manley, Jason R. Jeffries, Marc Janoschek, Kevin Huang, M. Brian Maple, Ayman H. Said, Bogdan M. Leu, Jeffrey W. Lynn
The organization of correlated electrons in the Hidden Order (HO) phase of intermetallic URu 2Si 2 is a longstanding mystery. In this work, we study the symmetry by mapping the lattice and magnetic excitations via inelastic neutron and x-ray scattering

Vetting the Security of Mobile Applications

January 26, 2015
Author(s)
Stephen Quirolgico, Jeffrey M. Voas, Tom T. Karygiannis, Christoph Michael, Karen Scarfone
The purpose of this document is to help organizations (1) understand the process for vetting the security of mobile applications, (2) plan for the implementation of an app vetting process, (3) develop app security requirements, (4) understand the types of

Alanine-EPR High-Dose Radiation Metrology

January 25, 2015
Author(s)
Marc F. Desrosiers
A comprehensive guide to the calibration, use, and maintenance of the alanine-EPR metrology system for high-dose radiation dosimetry is presented. Alanine dosimetry is the system of choice for calibration services for all major primary and secondary

Thermo-elastic induced phase noise in the LISA Pathfinder spacecraft

January 25, 2015
Author(s)
Ferran Gibert, Miquel Nofrarias, Nico Karnesis, Lluis Gesa, Victor Martin, Ignacio Mateos, Alberto Lobo, Reinhold Flatscher, Domenico Gerardi, Johannes Burkhardt, Ruediger Gerndt, David I. Robertson, Henry Ward, Paul McNamara, Felipe Guzman, Martin Hewitson, Ingo Diepholz, Jens Reiche, Gerhard Heinzel, Karsten Danzmann
During the on-station thermal test campaign of the LISA Pathfinder, the diagnostics subsystem was tested in nearly space conditions for the first time after integration in the satellite. The results showed the compliance of the temperature measurement

HVACR Editorial for IAQ 2013 Special Issue

January 23, 2015
Author(s)
Hal Levin, Steven Emmerich
The papers in this issue were selected from presentations made at the ASHRAE IAQ 2013: Environmental Health in Low Energy Buildings conference held in Vancouver Canada in October 2013. The conference was held specifically to review the state of knowledge

Quasielastic Neutron Scattering Study of POSS Ligand Dynamics

January 23, 2015
Author(s)
Niina Jalarvo, Madhu Sudan Tyagi, Michael K. Crawford
Polyoligosilsesquioxanes are molecules having cage-like structures composed of silicon and oxygen. These molecules can have a wide variety of functional ligands attached to them. Depending on the nature of the ligand, interesting properties and application

Public Safety Mobile Application Security Requirements Workshop Summary

January 22, 2015
Author(s)
Michael Ogata, Barbara Guttman, Nelson Hastings
This document captures the input received from the half-day workshop titled "Public Safety Mobile Application Security Requirements" organized by the Association of Public-Safety Communications Officials (APCO) International, in cooperation with FirstNet

Spectral Correlation Measurements at the Hong-Ou-Mandel Interference Dip

January 22, 2015
Author(s)
Thomas Gerrits, Francesco Marsili, Varun B. Verma, Lynden K. Shalm, Jeffrey A. Stern, Matthew Shaw, Richard P. Mirin, Sae Woo Nam
We present an efficient tool capable of measuring the spectral correlations between photons emerging from a Hong-Ou-Mandel interference configuration. We show that the Hong-Ou-Mandel interference visibility decreases as the photons’ frequency spread is

Workshop Summary: Materials Genome Initiative: Materials Data

January 22, 2015
Author(s)
James A. Warren
A key objective for the Materials Genome Initiative (MGI) is access to digital materials data. Access may be for an individual, a team, company, or an entire community of interest. There are several challenges to providing access to digital materials data

A determination of the local acceleration of gravity for the NIST-4 watt balance

January 21, 2015
Author(s)
David B. Newell, Eric J. Leaman, Darine El Haddad, Frank C. Seifert, Leon S. Chao, Yusi A. Cao, Jon R. Pratt, Stephan Schlamminger
A new watt balance is being constructed at the National Institute of Standards and Technology in preparation for the redefinition of the International System of Units and the realization of mass through an exact value of the Planck constant. The total

Effect of Installation Faults on Air-to-Air Heat Pump Performance

January 20, 2015
Author(s)
Piotr A. Domanski
Numerous studies and surveys indicate that typically-installed HVAC equipment operate inefficiently and waste considerable energy due to different installation errors (faults) such as improper refrigerant charge, incorrect airflow, oversized equipment
Displaying 18451 - 18475 of 73697
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