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Displaying 11626 - 11650 of 73832

Concept to Commercialization of an Artifact for Evaluating 3D Imaging Systems per the ASTM E3125- 17

June 29, 2018
Author(s)
Balasubramanian Muralikrishnan, Prem K. Rachakonda, Vincent D. Lee, Katharine M. Shilling, Daniel S. Sawyer, Geraldine S. Cheok, Luc Cournoyer, Joe Gleason
The newly released ASTM E3125-17 standard describes several point-to-point distance tests to evaluate the performance of spherical coordinate 3D imaging systems, commonly referred to as terrestrial laser scanners (TLS). The relative-range error test, which

Guidelines for the Use of PIV Credentials in Facility Access

June 29, 2018
Author(s)
Hildegard Ferraiolo, Ketan L. Mehta, Nabil Ghadiali, Jason Mohler, Vincent Johnson, Steven Brady
This recommendation provides a technical guideline to use Personal Identity Verification (PIV) Cards in facility access; enabling federal agencies to operate as government-wide interoperable enterprises. These guidelines cover the risk-based strategy to

Perpetual emulation threshold of PT-symmetric Hamiltonians

June 29, 2018
Author(s)
Ian B. Spielman, Clive Emary, Dimitris Trypogeorgos, Ana Vald?s-Curiel
We describe a technique to emulate a two-level PT-symmetric spin Hamiltonian, replete with gain and loss, using only the unitary dynamics of a larger quantum system. This we achieve by embedding the two-level system in question in a subspace of a four

Residual Stress in Additive Manufactured Nickel Alloy 625 Parts

June 29, 2018
Author(s)
Lindsey B. Bass, Justin L Milner, Thomas Gnaupel-Herold, Shawn P. Moylan
One of the key barriers to widespread adoption of additive manufacturing (AM) for metal parts is the build-up of residual stresses. In the laser-based powder bed fusion process, a laser selectively fuses metal powder layer by layer, generating significant

Second Chern number of a quantum-simulated non-Abelian Yang monopole

June 29, 2018
Author(s)
Ian B. Spielman, Francisco Salces Carcoba, Yuchen Yue, Abigail Perry, Seiji Sugawa
Topological order is often quantified in terms of Chern numbers, each of which classifies a topological singularity. Here, inspired by concepts from high-energy physics, we use quantum simulation based on the spin degrees of freedom of atomic Bose-Einstein

TMA: An Efficient Timestamp-Based Monitoring Approach to Test Timing Constraints of Cyber-Physical Systems

June 29, 2018
Author(s)
Mohammadreza Mehrabian, Mohammad Khayatian, Ahmed Mousa, Aviral Shrivastava, Patricia Derler, Ya-Shian Li-Baboud, Dhananjay Anand, Edward Griffor, Hugo Andrade, John Eidson
Formal specifications on temporal behavior of Cyber-Physical Systems (CPS) is essential for verification of performance and safety. Existing solutions for verifying the satisfaction of temporal constraints on a CPS are compute and resource intensive since

Improved Mesoscale Segmentation of Concrete from 3D X-ray Images Using Contrast Enhancers

June 28, 2018
Author(s)
Pietro Carrara, Rolands Kruse, Dale P. Bentz, M Lunardelli, Thorsten Leusmann, P Varady, Laura De Lorenzis
Obtaining the mesostructure of concrete from X-ray computed tomography (CT) requires segmentation of the data into distinct phases, a process complicated by the limited contrast between aggregates and mortar matrix. This paper explores the possibility to

Machine learning modeling of superconducting critical temperature

June 28, 2018
Author(s)
Aaron Gilad Kusne, Valentin Stanev, Ichiro Takeuchi
Superconductivity has been the focus of enormous research effort since its discovery more than a century ago. Yet, some features of this unique phenomenon remain poorly understood; prime among these is the connection between superconductivity and chemical

Measurements of scatter peaks in 137Cs and 60Co sources

June 28, 2018
Author(s)
Leticia S. Pibida
The results of the testing of radiation detection instruments with radionuclide identification capabilities will depended on the sources used for the tests. High resolution spectra need to be acquired to determine all the observable peaks in the source

STEP File Analyzer and Viewer User Guide (Update 5)

June 28, 2018
Author(s)

Robert R. Lipman

This guide describes how to use the STEP File Analyzer and Viewer, a software tool that analyzes and generates a spreadsheet or a set of CSV (comma-separated value) files from a STEP (STandard for the Exchange of Product model data) file. The spreadsheets

A practical field guide to thermoelectrics: fundamentals, synthesis, and characterization

June 27, 2018
Author(s)
Alex Zevalkink, David M. Smiadak, Joshua Martin, Michael Chabinyc, Olivier Delaire, Jeffrey Blackburn, Andrew Ferguson, Jian Wang, Kirill Kovnir, Laura Schelhas, Stephen D. Kang, Maxwell T. Dylla, G. J. Snyder, Brenden Ortiz, Eric Toberer
The study of thermoelectric materials spans condensed matter physics, materials science and engineering, and solid-state chemistry. The diversity of the participants and the inherent complexity of the topic means that it is difficult, if not impossible, for

In-Vehicle Software Defined Networking: An Enabler for Data Interoperability

June 27, 2018
Author(s)
Khalid Halba, Charif Mahmoudi
Future transportation systems evolve new in-vehicle network designs are required to handle the heterogeneous data generated by different Electronic Control Modules (ECUs). Enabling interaction between these data sources can trigger innovation and the

No Phishing beyond This Point

June 27, 2018
Author(s)
Kristen Greene, Michelle P. Steves, Mary F. Theofanos
As phishing continues to evolve, what is your organization doing to stay off the hook?

Slip Detection: Analysis and Calibration of Univariate Tactile Signals

June 27, 2018
Author(s)
Karl Van Wyk, Joseph A. Falco
he existence of tactile afferents sensitive to slip-related mechanical transients in the human hand augments the robustness of grasping through secondary force modulation protocols. Despite this knowledge and the fact that tactile-based slip detection has

Baseline Tailor

June 26, 2018
Author(s)
Joshua Lubell
Baseline Tailor is an innovative web application for users of the National Institute of Standards and Technology (NIST) Cybersecurity Framework and Special Publication (SP) 800-53. Baseline Tailor makes the information in these widely referenced

Data-driven Discovery of 3D and 2D Thermoelectric Materials

June 26, 2018
Author(s)
Kamal Choudhary, Kevin Garrity, Francesca Tavazza
Abstract: In this work, we perform a systematic search for high-efficiency, three-dimensional (3D) and two-dimensional (2D) thermoelectric materials by combining semiclassical transport techniques with density functional theory (DFT) calculations. Out of
Displaying 11626 - 11650 of 73832
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