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Displaying 11601 - 11625 of 73751

Machining behavior of additively manufactured and cast-wrought nickel-based super alloy (IN625)

June 22, 2018
Author(s)
Rajesh K. Ananda-Kumar, Wilfredo Moscoso-Kingsley, Gregor Jacob, Alkan Donmez, Viswanathan Madhavan
Additively manufactured (AM) and cast-wrought (CW) nickel-based super alloy (IN 625) with known processing history and quasi-static properties have been investigated for their relative machinability, in terms of tool temperature and wear, as well as force

REFERENCE VALUES AND REFERENCE CORRELATIONS FOR THE THERMAL CONDUCTIVITY AND VISCOSITY OF FLUIDS

June 22, 2018
Author(s)
Marc J. Assael, A.E. Kalyva, S.A. Monogenidou, Marcia L. Huber, Richard A. Perkins, Daniel G. Friend, Eric F. May
In this paper reference values and reference correlations for the thermal conductivity and viscosity of pure fluids are presented. Reference values and correlations for the thermal conductivity and the viscosity of pure fluids provide thoroughly evaluated

THE INTERDEPENDENT NETWORKED COMMUNITY RESILIENCE MODELING ENVIRONMENT (IN-CORE)

June 22, 2018
Author(s)
Paolo Gardoni, John W. van de Lindt, Bruce Ellingwood, Therese P. McAllister, Jong Lee, Harvey Cutler, Daniel Cox
The National Institute of Standards and Technology (NIST) funded the multi-university five-year Center of Excellence for Risk-Based Community Resilience Planning (CoE), headquartered at Colorado State University, to develop the measurement science to

Determination of polycyclic aromatic hydrocarbons with molecular mass 302 in standard reference material 1597a by reversed-phase liquid chromatography and stop-flow fluorescence detection

June 21, 2018
Author(s)
Hugh Hayes, Walter Wilson, Lane Sander, Stephen Wise, Andres Campiglia
The identification of isomeric polycyclic aromatic hydrocarbons (PAHs) in complex samples via reversed-phase liquid chromatography (RPLC) with fluorescence detection (FL) is normally based on matching the chromatographic retention times of suspected peaks

Dosimetric characterization of a new directional low-dose rate brachytherapy source

June 21, 2018
Author(s)
Michael G. Mitch, Larry A. DeWerd, Manik Aima, Clifford G. Hammer, Wesley S. Culberson
CivaTech Oncology Inc. (Durham, NC) has developed a novel low-dose rate (LDR) brachytherapy source called the CivaSheet. The source is a planar array of discrete elements (“CivaDots") which are directional in nature. This work investigates the

Evidence for cortisol-cortisone metabolism by marine mammal blubber

June 21, 2018
Author(s)
Thomas M. Galligan, Lori Schwacke, Wayne E. McFee, Ashley Russell
Blubber, a specialized form of adipose tissue in marine mammals, has been identified as a useful matrix for the assessment of steroid hormone homeostasis in cetaceans. However, blubber cortisol measurements are not quantitatively predictive of circulating

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
Displaying 11601 - 11625 of 73751
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