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Search Publications

NIST Authors in Bold

Displaying 11751 - 11775 of 73896

Force modeling for hybrid manufacturing

June 21, 2018
Author(s)
Michael Gomez, Jarred C. Heigel, Tony Schmitz
This paper investigates the cutting forces during the machining of additively manufactured metals. Two pairs of workpieces were produced by powder bed direct metal selective laser sintering. These workpieces included a 17-4 stainless steel substrate

Gas Adsorption in an Isostructural Series of Pillared Coordination Cages

June 21, 2018
Author(s)
Eric J. Gosselin, Gregory R. Lorzing, Benjamin Trump, Craig Brown, Eric D. Bloch
The synthesis and characterization of six novel pillared metal-organic polyhedra is reported. By utilizing dabco (1,4-diazabicyclo[2.2.2.]octane), a pillar with increased basicity as compared to typical pillars such as pyrazine, three new stable copper

Implementation of Advanced Laser Control Strategies for Powder Bed Fusion Systems

June 21, 2018
Author(s)
Ho Yeung, Brandon Lane, Alkan Donmez, Jason Fox, Jorge Neira
Laser path, scan speed, and laser power are critical machine parameters determining the quality of the output of laser-based powder bed fusion (LPBF) processes. A jerk-limited control strategy is implemented for laser path planning on a LPBF additive

Improved characterization of methane emissions from the U.S. oil and gas supply chain

June 21, 2018
Author(s)
Ramon A. Alvarez, Daniel Zavala-Araiza, David R. Lyon, David T. Allen, Zachary R. Barkley, Adam R. Brandt, Kenneth J. Davis, Scott C. Herndon, Daniel J. Jacob, Anna Karion, Eric A. Kort, Brian K. Lamb, Thomas Lauvaux, Joannes D. Maasakkers, Anthony J. Marchese, Mark Omara, Stephen W. Pacala, Jeff Peischl, Allen L. Robinson, Paul B. Shepson, Colm Sweeney, Amy Townsend-Small, Steven C. Wofsy, Daniel Zimmerle, Steven P. Hamburg
The contribution of the U.S. oil and natural gas supply chain to global methane emissions - an important factor in climate warming - was estimated using ground-based measurements and validated with region-wide aircraft measurements in areas accounting for

ThermoData Engine

June 21, 2018
Author(s)
Vladimir Diky, Chris D. Muzny, Kenneth G. Kroenlein, Eric W. Lemmon, Ian H. Bell, Andrei F. Kazakov, Yauheni Paulechka

An Iterative Qualitative - Quantitative Sequential Analysis Strategy for Electron-Excited X-ray Microanalysis with Energy Dispersive Spectrometry: Finding the Unexpected Needles in the Peak Overlap Haystack

June 20, 2018
Author(s)
Dale E. Newbury, Nicholas Ritchie
When analyzing an unknown by electron-excited energy dispersive X-ray spectrometry with the entire periodic table possibly in play, how does the analyst discover minor and trace constituents when their peaks are overwhelmed by the intensity of an

Quantum-based vacuum metrology at NIST

June 20, 2018
Author(s)
Julia K. Scherschligt, James A. Fedchak, Zeeshan Ahmed, Daniel S. Barker, Kevin O. Douglass, Stephen P. Eckel, Edward T. Hanson, Jay H. Hendricks, Thomas P. Purdy, Jacob E. Ricker, Robinjeet Singh
The measurement science in realizing and disseminating the SI unit for pressure, the pascal (Pa), has been the subject of much interest at NIST. Modern optical-based techniques for pascal metrology have been investigated, including multi-photon ionization

Review of Refrigerants Evolution

June 20, 2018
Author(s)
Piotr A. Domanski, Mark O. McLinden, Andrei F. Kazakov, J S. Brown, Riccardo Brignoli, Jaehyeok Heo, Janusz Wojtusiak
The presentation discusses the application of refrigerants from the beginnings of ‘artificial cold’ in the era of industrial revolution to the currently used fluids, and the refrigerant options in response to environmental concerns. The outlook for new

Robust Extraction of Hyperbolic Metamaterial Permittivity using Total Internal Reflection Ellipsometry

June 20, 2018
Author(s)
Cheng Zhang, Nina Hong, Chengang Ji, Wenqi Zhu, Xi Chen, Amit K. Agrawal, Zhong Zhang, Tom E. Tiwald, Stefan Schoeche, James N. Hilfiker, L. Jay Guo, Henri J. Lezec
Hyperbolic metamaterials are optical materials characterized by highly anisotropic effective permittivity tensor components having opposite signs along orthogonal directions. The techniques currently employed for characterizing the optical properties of

Systems Design Approach to Low-Cost Coinage Materials

June 20, 2018
Author(s)
Eric Lass, Mark R. Stoudt, Carelyn E. Campbell
A system design approach using an Integrated Computational Materials Engineering (ICME) was used to design three new low-cost seamless replacement coinage alloys to reduce the raw material of the current US coinage alloys. Maintaining compatibility with

A Standards and Technology Roadmap for Scalable Distributed Manufacturing Systems

June 19, 2018
Author(s)
Thomas D. Hedberg Jr., Moneer Helu, Timothy A. Sprock
The increasing decentralization of manufacturing has contributed to the growing interest in scalable distributed manufacturing systems (DMSs). The emerging body of work from smart manufacturing, Industrie 4.0, Industrial Internet of Things (IIoT), and

Improving dielectric nanoresonator array coatings for solar cells

June 19, 2018
Author(s)
Dongheon Ha, Nikolai B. Zhitenev
We introduce single layer silicon dioxide (SiO2) nanosphere arrays as antireflection coatings (ARCs) on a gallium arsenide (GaAs) solar cell. We make macro- and nanoscale experiments and finite-difference time-domain (FDTD) calculations to prove the

Point-of-Use, Nonexclusive, High-Power Laser Power Meter

June 19, 2018
Author(s)
Aly Artusio-Glimpse, Ivan Ryger, Paul A. Williams, John H. Lehman
We have developed a small-package, high-power laser power meter that directly measures radiation pressure on a high-reflectivity mirror for nonexclusive, in situ laser measurements without pick- off schemes. Furthermore, our non-inertial design inhibits

Design of an Octo-Strain Specimen for Biaxial Tension Testing

June 18, 2018
Author(s)
Justin L Milner, Thomas H. Gnaupel-Herold
A custom biaxial testing fixture was designed to evaluate a new specimen geometry for complex loading paths. Biaxial testing is commonly used to evaluate work-hardening behavior of sheet metal in biaxial tension to study the accumulation of plastic strains

First Direct Experimental Studies of Hf0.5Zr0.5O2 Ferroelectric Polarization Switching Down to 100-picosecond in Sub-60mV/dec Germanium Ferroelectric Nanowire FETs

June 18, 2018
Author(s)
Wonil Chung, Mengwei Si, Pragya Shrestha, Jason Campbell, Kin P. Cheung, Peide Ye
In this work, ultrafast pulses with pulse widths ranging from 100 ps to seconds were applied on the gate of Ge ferroelectric (FE) nanowire (NW) pFETs with FE Hf0.5Zr0.5O2 (HZO) gate dielectric exhibiting steep subthreshold slope (SS) below 60 mV/dec bi

C3a receptor antagonism as a novel therapeutic target for chronic rhinosinusitis

June 15, 2018
Author(s)
Jennifer K. Mulligan, Tucker Williamson, Nicholas Reaves, William Carroll, Sarah Stephenson, Peng Gao, Richard R. Drake, Ben Neely, Rodney J. Schlosser, Carl Atkinson
Background: Innate immune factors, including the complement system, have been implicated in the pathogenesis of chronic rhinosinusitis with nasal polyps (CRSwNP). Here we examine complement activity within the respiratory mucosa of CRSwNP patients, and a
Displaying 11751 - 11775 of 73896
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