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Displaying 13151 - 13175 of 73755

Effects of Powder Oxidation on Impact Toughness of Electron Beam Melt Ti-6Al-4V

August 25, 2017
Author(s)
Edward J. Garboczi, Enrico Lucon, William Grell, Z Loftus, Maciej Kumosa, E Solis-Ramos, Paul Predecki, E Clark
Powder quality in additive manufacturing (AM) electron beam melt (EBM) of Ti-6Al-4V components is crucial in determining the critical material properties of the end item. In this study, we report on the effect of powder oxidation on Charpy impact energy of

Pattern selection in ternary mushy layers

August 25, 2017
Author(s)
Daniel M. Anderson
We consider finite-amplitude convection in a mushy layer during the primary solidification of a ternary alloy. A previous linear theory identified, for the case of vanishing latent heat, solute rejection and background solidification, a direct mode of

An Analytical Solubility Model for Nitrogen-Methane-Ethane Ternary Mixtures

August 24, 2017
Author(s)
Jason Hartwig, Peter Meyerhofer, Ralph Lorenz, Eric Lemmon
Saturn's moon Titan has surface seas of liquid hydrocarbons and a thick, cold, nitrogen atmosphere, and is a target for future exploration. Critical to the design and operation of vehicles for this environment is knowledge of the amount of dissolved

SI Measurement System Chart

August 24, 2017
Author(s)
Elizabeth J. Benham
This publication is a colorful chart explaining the 7 base units of the SI (International System of Units) and prefix symbols, featuring the Measurement League: Guardians of the SI. The Measurement League are superheroes dedicated to the fight against

Broadband, high-resolution investigation of advanced absorption lineshapes at high temperature

August 23, 2017
Author(s)
Ian R. Coddington, William C. Swann, Nathan R. Newbury, Paul J. Schroeder, Matthew J. Cich, Jinyu Yang, Brian J. Drouin, Gregory B. Rieker
Spectroscopic studies of planetary atmospheres and high-temperature processes (e.g. combustion) require absorption lineshape models that are accurate over extended temperature ranges. To date, advanced lineshapes, like the speed-dependent Voigt and Rautian

Formation of the Ni3Nb delta-phase in stress-relieved Inconel 625 produced via powder-bed laser fusion additive manufacturing

August 23, 2017
Author(s)
Eric Lass, Mark R. Stoudt, Maureen E. Williams, Michael B. Katz, Thien Q. Phan, Lyle E. Levine, Thomas H. Gnaeupel-Herold
The microstructural evolution of laser powder-bed additively manufactured Inconel 625 during a post-build stress-relief anneal of 1 h at 870 °C is investigated. It is found that this industry-recommended heat treatment promotes the formation of a

MediFor Nimble Challenge Evaluation 2017

August 23, 2017
Author(s)
Jonathan G. Fiscus, Haiying Guan, Yooyoung Lee, Amy Yates, Andrew Delgado, Daniel F. Zhou, David M. Joy, August L. Pereira
NIST presentation slides for DARPA MediFor Program One-Year PI Meeting

Lipid Nanodomains Change Ion Channel Function

August 22, 2017
Author(s)
Michael NMN Weinrich, David Worcester, Sergey M. Bezrukov
Signaling proteins and neurotransmitter receptors associate with cholesterol-rich fractions of cell membranes--lipid rafts. The different lipid environment in rafts can modulate protein function, but evidence for modulation of ion channels is lacking. Here

Modelling and Influencing Human Behaviour in Fire

August 22, 2017
Author(s)
Steve Gwynne, Erica D. Kuligowski, Michael Kinsey, Lynn Hulse
The purpose of this article is to present a conceptual model of human behaviour in fire and its impact on evacuation modelling, life safety analyses, and evacuation procedures. This model is based on a theoretical framework of individual decision-making

Quantitative Scanning Probe Microscopy for Nanomechanical Forensics

August 22, 2017
Author(s)
Frank W. DelRio, Robert F. Cook
Scanning probe microscopy techniques—in particular atomic force microscopy (AFM)—provide a means for imaging objects and measuring mechanical properties at the nano- and micro-scales in a non-destructive manner. In this paper, the previous use of AFM in

A serum small molecule biosignature of radiation exposure from total body irradiated patients

August 21, 2017
Author(s)
Evagelia C. Laiakis, Evan L. Pannkuk, Siddheshwar Chauthe, Yi-Wen Wang, Ming Liang, Tytus Mak, Christopher A. Barker, Giuseppe Astarita, Albert J. Fornace
The potential of radiological accidents and nuclear terrorism have increased the need for development of new rapid biodosimetry methods. In addition, in a clinical setting the issue of an individual's radiosensitivity should be taken into consideration

Blunt scratch strength of polycrystalline alumina

August 21, 2017
Author(s)
Robert F. Cook
A model for the fracture strength of brittle materials controlled by blunt (spherical) scratches is developed and compared with measurements on a polycrystalline alumina. The model is based on a residual stress-intensity factor for median cracks at

Developing an Assessment Methodology for Community Resilience

August 21, 2017
Author(s)
Maria Dillard
Communities can be characterized as complex systems, with resilience as an emergent property. Complex systems are systems composed of interconnected parts that exhibit emergent properties that arise from the collective and cannot be derived from the
Displaying 13151 - 13175 of 73755
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