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Search Publications

NIST Authors in Bold

Displaying 15901 - 15925 of 74045

Design, Developments, and Results from the NIST Additive Manufacturing Metrology Testbed (AMMT)

August 10, 2016
Author(s)
Brandon M. Lane, Sergey Mekhontsev, Steven E. Grantham, Mihaela Vlasea, Justin G. Whiting, Ho Yeung, Jason C. Fox, Clarence J. Zarobila, Jorge E. Neira, Michael L. McGlauflin, Leonard M. Hanssen, Shawn P. Moylan, M A. Donmez, Joseph P. Rice
NIST is developing a facility titled the Additive Manufacturing Metrology Testbed that will enable advanced research into monitoring, controls, process development, and temperature measurement for laser powder bed fusion additive manufacturing and similar

Development of a NIST WR10 Radiometer

August 10, 2016
Author(s)
Jack T. Surek, Dazhen Gu, Dave K. Walker
— This paper describes the development of a waveguide radiometer to measure noise from millimeter wave electronic components across the full WR10 band from 75 GHz to 110 GHz. DUT noise temperature is estimated based on comparison with room temperature and

NIST Updates Personal Identity Verification (PIV) Guidelines

August 10, 2016
Author(s)
Hildegard Ferraiolo, Larry Feldman, Gregory A. Witte
This bulletin summarized the information presented in NIST SP 800-156: Derived PIV Application and Data Model Test Guidelines and NIST SP 800-166: Representation of PIV Chain-of-Trust for Import and Export. These publications support Federal Information

A comprehensive Doppler error budget for next generation, extreme precision spectrometers

August 9, 2016
Author(s)
Ryan C. Terrien, Samuel Halverson, Suvrath Mahadevan, Arpita Roy, Chad Bender, Guomundur K. Stefansson, Andrew Monson, Eric Levi, Fred Hearty, Cullen Blake, Michael McElwain, Christian Schwab, Lawrence Ramsey, Jason Wright, Sharon Wang, Qian Gong, Paul Robertson
We describe a detailed radial velocity error budget for the NASA-NSF Extreme Precision Doppler Spectrometer instrument concept NEID (NN-explore Exoplanet Investigations with Doppler spectroscopy). Such an instrument performance budget is a necessity for

Energy Bandgap and Edge States in an Epitaxially Grown Graphene/h-BN Heterostructure

August 9, 2016
Author(s)
Beomyong Hwang, Hwang Jeongwoon, Jong K. Yoon, Sungjun Lim, Sungmin Kim, Minjun Lee, Jeong H. Kwon, Hongwoo Baek, Dongchul Sung, Gunn Kim, Suklyun Hong, Jisson Ihm, Joseph A. Stroscio, Young Kuk
Securing a stable bandgap is an essential requirement for applications of graphene layers in switching devices. Theoretical studies have suggested creating a bulk bandgap and modified edge states with an asymmetry between the A and B sub-lattice sites of

Laser Path Planning and Power Control Strategies for Powder Bed Fusion Systems

August 9, 2016
Author(s)
Ho Yeung, Jorge Neira, Brandon Lane, Jason Fox, Felipe F. Lopez
In laser powder bed fusion additive manufacturing process, laser scan path, velocity, and power are some of the most important parameters affecting the build quality. Control strategies for laser path and power are implemented and tested on a prototype

Reference Correlations of the Thermal Conductivity of Ethylene and Propylene

August 9, 2016
Author(s)
A. Koutian, Marc J. Assael, Marcia L. Huber, Richard A. Perkins
New, wide-range reference equations for the thermal conductivity of ethylene and propylene as a function of temperature and density are presented. The equations are based in part upon a body of experimental data that has been critically assessed for

Structure of Polyelectrolyte Brushes in the Presence of Multivalent Counterions

August 9, 2016
Author(s)
Jing Yu, Jun Mao, Guangcui Yuan, Sushil K. Satija, Zhang Jiang, Wei Chen, Matthew Tirrell
Polyelectrolyte brushes are of great importance to a wide range of fields, ranging from colloidal stabilization to responsive and tunable materials to lubrication. We synthesized high-density polystyrene sulfonate (PSS) brushes using surface force

Temperature measurements in MRI using ferromagnetic particles

August 9, 2016
Author(s)
Karl F. Stupic, Janusz H. Hankiewicz, Zbigniew Celinski, Robert E. Camley
We explore the possibility of using small ferromagnetic particles with a strong temperature- dependent magnetization to produce temperature maps using magnetic resonance imaging (MRI). We present the first experimental results showing that the 1H nuclear

Publications Committee

August 8, 2016
Author(s)
Dylan F. Williams
A description of the IEEE Microwave Theory and Techniques Society Budget Committee.

Modeling and Measuring Chloride Ingress into Cracked Mortar

August 7, 2016
Author(s)
Scott Jones, Jeffery Davis, John L. Molloy, John R. Sieber, Dale P. Bentz
Chloride ingress into reinforced concrete structures is responsible for initiating corrosion of steel embedded into concrete. To aide in the prediction of concrete service life, a chloride ingress model that includes chloride binding to the cement matrix

A 3He beam stop for minimizing gamma-ray and fast-neutron background

August 6, 2016
Author(s)
Danyal J. Turkoglu, Robert G. Downing, Wangchun Chen, Dagistan Sahin, Jeremy C. Cook
Prompt gamma-ray activation analysis facilities with high neutron currents (≥109 s-1) generate triton-induced fast neutrons from 6Li-loaded collimators and beam stops at rates that soon damage gamma-ray detectors. We develop an alternative beam stop design

Current status and future directions for in situ transmission electron microscopy

August 6, 2016
Author(s)
M. L. Taheri, Eric Stach, Ilke Arslan, Peter A. Crozier, Kabius Bernd, Thomas LaGrange, Andrew Minor, Seiji Takeda, Mihaela M. Tanase, Jakob B. Wagner, Renu Sharma
This review article discusses the current and future possibilities for the application of in situ transmission electron microscopy to reveal synthesis pathways and functional mechanisms in complex and nanoscale materials. The findings of a group of

Magnetic Random Access Memory

August 5, 2016
Author(s)
Michael L. Schneider, P. G. Mather
Magnetic Random Access Memory (MRAM) possesses a unique combination of attributes that provide considerable benefits over those available with conventional memory technology. Here we discuss the state-of-the-art of MRAM, from parts currently in production

Measuring extended red sensitivity in a 1.7mm-cutoff HgCdTe detector array

August 5, 2016
Author(s)
Ryan C. Terrien, Andrew J. Monson, Chad Bender, Samuel P. Halverson, Larry Ramsey
Infrared detectors with cutoff wavelengths of ∼ 1.7 μm have much lower sensitivity to thermal background contamination than those with longer cutoff wavelengths. This low sensitivity offers the attractive possibility of reducing the need for fully
Displaying 15901 - 15925 of 74045
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