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Search Publications

NIST Authors in Bold

Displaying 13751 - 13775 of 73929

Progress in Modeling Wildland Fires using Computational Fluid Dynamics

June 12, 2017
Author(s)
Kevin B. McGrattan
This paper presents a sensitivity study for computational fluid dynamics (CFD) simulations of grassland fires. The simulations are compared with the results of experiments conducted in northern Australia in 1986. The report of these experiments notes that

Self-referenced frequency combs using high-efficiency silicon nitride waveguides

June 12, 2017
Author(s)
David R. Carlson, Daniel D. Hickstein, Alexander J. Lind, Stefan Droste, Daron A. Westly, Nima Nader, Ian R. Coddington, Nathan R. Newbury, Kartik A. Srinivasan, Scott A. Diddams, Scott B. Papp
We utilize silicon nitride waveguides to self-reference telecom-wavelength fiber frequency combs through supercontinuum generation using less than 15 mW total optical average power. This is approximately ten times lower than conventional approaches using

Fabrication of High-Speed and High-Density Single-Flux-Quantum Circuits at NIST

June 11, 2017
Author(s)
David Olaya, Paul Dresselhaus, Pete Hopkins, Samuel P. Benz
The development of a fabrication process for single-flux-quantum (SFQ) digital circuits is a fundamental part of the NIST effort to develop a gigahertz waveform synthesizer with quantum voltage accuracy. This paper describes the current SFQ fabrication

Integrating Finite Element Analysis with Systems Engineering Models

June 11, 2017
Author(s)
Jerome Szarazi, Axel Reichwein, Conrad Bock
In order to promote traceability, consistency, interoperability and better collaboration between systems engineering and Finite Element Analysis (FEA)-based simulation activities, we propose a tool-independent description of FEA models that integrates with

Scalable, High-Speed, Digital Single-Flux-Quantum Circuits at NIST

June 11, 2017
Author(s)
Pete Hopkins, Manuel Castellanos Beltran, Christine A. Donnelly, Paul Dresselhaus, David Olaya, Adam Sirois, Samuel P. Benz
We describe NIST's capabilities for designing and fabricating niobium-based single-flux quantum (SFQ) digital and mixed-signal circuits and show test results of our first circuits. We have assembled a package of software design tools that are readily

Smart manufacturing through a framework for a knowledge-based diagnosis system

June 9, 2017
Author(s)
Michael P. Brundage, Boonserm Kulvatunyou, Toyosi Ademujimi, Badarinath Rakshith
Various techniques are used to diagnose problems throughout all levels of the organization within the manufacturing industry. Often times, this root cause analysis is ad-hoc with no standard representation for artifacts or terminology (i.e., no standard

PROCEDURE FOR DEVELOPING KEY PERFORMANCE INDICATORS FOR SUSTAINABLE MANUFACTURING

June 8, 2017
Author(s)
Shaw C. Feng, Deogratias Kibira, Michael P. Brundage, Katherine C. Morris
The need for an open, inclusive, and neutral procedure for developing key performance indicators (KPIs) has been increasing as manufacturers seek to determine what to measure in order to improve environmental sustainability of their products and

Software Tools for Uncertainty Evaluation in VNA Measurements: A Comparative Study

June 8, 2017
Author(s)
Gustavo Avolio, Dylan Williams, Michael Frey, Sarah B. Streett, Dominique Schreurs, Andrea Ferrero, Michael Dieudonne
We compared three software tools designed for scattering-parameter measurement uncertainty evaluation. These tools propagate uncertainty to calibrated S-parameters by means of a sensitivity analysis. We also validated the sensitivity analysis with Monte

Towards a Robot Task Ontology Standard

June 8, 2017
Author(s)
Stephen B. Balakirsky, Craig I. Schlenoff, Sandro R. Fiorini, Signe Redfield, Marcos Barreto, Hirenkumar Nakawala, Joel L. Carbonera, Larisa Soldatova, Julita Bermejo-Alonso, Fatima Maikore, Paulo J. Goncalves, Elena D. Momi, S. Veera Ragavan, Tamas Haidegger
Ontologies serve robotics in many ways, particularly in describing and driving autonomous functions. These functions are built around robot tasks. The goal of a recently established international study group is to develop a knowledge representation that

ACCURACY DEGRADATION ANALYSIS FOR INDUSTRIAL ROBOT SYSTEMS

June 7, 2017
Author(s)
Guixiu Qiao, Brian A. Weiss
As robot systems become increasingly prevalent in manufacturing environments, the need for improved accuracy continues to grow. Recent accuracy improvements have greatly enhanced automotive and aerospace manufacturing capabilities, including high-precision

An Improved Basis for Characterizing the Suitability of Fly Ash as a Cement Replacement Agent

June 7, 2017
Author(s)
Tandre Oey, Jason Timmons, Paul E. Stutzman, Jeffrey W. Bullard, Magdalena Balonis, Mathieu Bauchy, Gaurav Sant
Fly ash is a critical yet underutilized material for partial replacement for ordinary portland cement (OPC) in the binder fraction of a concrete. Significant compositional variability, and a lack of rigorous classification methods currently limit fly ash

Building Connections through Standards Landscaping

June 7, 2017
Author(s)
Paul W. Witherell, Yan Lu
Standards are an essential part of how we do business, from communication, to establishing best practices, to achieving quality control. As commerce and technology continues to diversify, standards, and standard organizations, have become increasingly

Developing a capability-based similarity metric for manufacturing processes

June 7, 2017
Author(s)
Kevin Li, William Z. Bernstein
Manufacturing taxonomies and accompanying metadata of manufacturing processes have been catalogued in both reference books and databases online. However, such information remains in a form that is uninformative to the various stages of the product life

Microparticle tracking velocimetry as a tool for microfluidic flow measurements

June 7, 2017
Author(s)
Paul NMN Salipante, Steven D Hudson, James W. Schmidt, John D. Wright
The accurate measurement of flows in microfluidic channels is important for commercial and research applications. We compare the accuracy of flow measurement techniques over a wide range flows. Flow measurements made using holographic microparticle
Displaying 13751 - 13775 of 73929
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