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 20726 - 20750 of 73960

On the Use of Phase Data When Conducting an Extrapolation Measurement

November 1, 2013
Author(s)
Jason B. Coder, David R. Novotny, Michael H. Francis, Jeffrey R. Guerrieri
The extrapolation measurement technique has been used with the three antenna method for more than 40 years, to determine absolute antenna gain and polarization data. The critical part of the extrapolation technique is an insertion loss measurement that is

X-Ray microbeam diffraction study of long-range internal stresses in equal-channel angular pressed aluminum

November 1, 2013
Author(s)
Lyle E. Levine, I-Fang Lee, Thien Phan, Jonathan Z. Tischler, Peter Geantil, Yi Huang, Terrance G. Langdon, Michael E. Kassner
Aluminum alloy 1050 was processed by equal-channel angular pressing (ECAP) using a single pass (equivalent uniaxial strain of about 0.88). Long-range internal stresses (LRIS) were assessed in grain/subgrain interiors by measuring the spacing of {531}

Cold-atom double-lambda coherent population trapping clock

October 31, 2013
Author(s)
Elizabeth A. Donley, Francois-Xavier R. Esnault, Eric M. Blanshan, Eugene N. Ivanov, Robert E. Scholten, John E. Kitching
Miniature atomic clocks based on coherent population trapping (CPT) states in thermal atoms are emerging as an important component in many field applications, particularly where satellite frequency standards are not accessible. Cold-atom CPT clocks promise

Fluctuation Enhanced Sensing (FES) with a Nanostructured Semiconducting Metal Oxide Film for Gas Detection and Classification

October 31, 2013
Author(s)
Bulent Ayhan, Chiman Kwan, Jin Zhou, Laszlo Kish, Kurt D. Benkstein, Phillip H. Rogers, Stephen Semancik
The feasibility of fluctuation-enhanced sensing (FES) for the detection and classification of different gases by using a single microsensor has been experimentally demonstrated. A nanostructured semiconducting metal oxide film has been used as a

Stair evacuation of older adults and people with mobility impairments

October 31, 2013
Author(s)
Erica D. Kuligowski, Richard D. Peacock, Emily Wiess, Bryan Hoskins
Engineers analyze occupant movement data for the safety and protection of a population during emergency building evacuations. Quantifiable variables, such as: stairwell geometry, pre-evacuation delay, occupant speed, and population density form engineering

A Methodology for Handling Standards Terminology for Sustainable Manufacturing

October 30, 2013
Author(s)
Anantha Narayanan Narayanan, David J. Lechevalier, Katherine C. Morris, Sudarsan Rachuri
In order to develop the discipline of sustainable manufacturing, the language of discourse needs to be properly and clearly communicated, for both manufacturers and consumers. As a result a range of information standards that define the needed terminology

An accelerated exposure and testing apparatus for building joint sealants

October 30, 2013
Author(s)
Christopher C. White, Donald L. Hunston, Kar T. Tan, John W. Hettenhouser, Jason D. Garver
The design, fabrication and implementation of a computer-controlled exposure and testing apparatus for building joint sealants are described in this paper. This apparatus is unique in its ability to independently control and monitor temperature, relative

Suppression of Directional Light-Wave Mixing in Normal and Quantum Gases

October 30, 2013
Author(s)
Lu Deng, Chengjie Zhu, Edward W. Hagley, W R. Garrett
We discuss nonlinear optical processes in the presence of quantum gases. We show that in contrast to a normal gas where the medium “passively” participates in nonlinear optical processes, quantum gases “actively” interact with the wave mixing process by

Benefits and Costs of Commissioning: A Case Study Analysis

October 29, 2013
Author(s)
Stanley W. Gilbert
Commissioning is a “quality assurance process for the design, construction and operation of buildings.” Specifically, Building Commissioning is a process of auditing buildings to help them operate with greater efficiency in accomplishing their intended

Elasticity and rigidity percolation in networks of type-purified single-wall carbon nanotubes on flexible substrates

October 29, 2013
Author(s)
John M. Harris, JiYeon Huh, Matthew R. Semler, Christopher Stafford, Steven Hudson, Jeffrey Fagan, Erik K. Hobbie
Wrinkles and folds in compressed thin films of type-purified single-wall carbon nanotubes (SWCNTs) on polydimethylsiloxane (PDMS) substrates are used to study the mechanical response of pristine nanotube networks. While the low-strain plateau moduli are

Time Required to Injection-Lock Spin Torque Nanoscale Oscillators

October 29, 2013
Author(s)
William H. Rippard, Matthew R. Pufall, Anthony B. Kos
We have injection-locked a spin-transfer oscillator to a second-harmonic electrical input signal and measured the relative phase and amplitude of the device output as a function of DC current under steady-state conditions. The relative phase of the device

Achieving Climate Change Absolute Accuracy in Orbit

October 28, 2013
Author(s)
Bruce Wielicki, Joseph P. Rice
The Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission will provide a metrology laboratory in orbit for the purpose of accurately measuring and attributing climate change. CLARREO measurements establish new climate change benchmarks

Combining Genetic Algorithms & Simulation to Search for Failure Scenarios in System Models

October 28, 2013
Author(s)
Kevin L. Mills, Christopher E. Dabrowski, James J. Filliben, Sanford P. Ressler
Large infrastructures, such as clouds, can exhibit substantial outages, sometimes due to failure scenarios that were not considered during system design. We define a method that uses a genetic algorithm (GA) to search system simulations for parameter

Structural Design for Disaster Resilience

October 28, 2013
Author(s)
Fahim H. Sadek, Joseph Main, John L. Gross, Therese P. McAllister
This paper presents a brief overview of research at the National Institute of Standards and Technology (NIST) on disaster resilience of buildings, infrastructure, and communities, including component programs and projects. NIST's efforts aim at developing

Optical Coherence Tomography for Dimensional Metrology of Lab-on-a-chip devices

October 27, 2013
Author(s)
Darwin R. Reyes-Hernandez, Michael W. Halter, Jeeseong Hwang
Here we present a new metrology tool for the determination of the dimensions of channels from final product Lab-on-a-chip devices. Using Optical Coherence Tomography (OCT) areas of up to 12 mm x 12 mm can be imaged in less than 1 second, without the need
Displaying 20726 - 20750 of 73960
Was this page helpful?