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Search Publications

NIST Authors in Bold

Displaying 15151 - 15175 of 73697

Review of Research for Docking Automatic Guided Vehicles and Mobile Robots

October 13, 2016
Author(s)
Roger V. Bostelman, Tsai H. Hong
This survey provides a literature review of docking research, an area that has relatively few research articles as compared to generic automatic guided vehicle (AGV) or mobile robot research. Docking refers to the arrival and act of a vehicle stopping at a

STEEL GRAVITY CONNECTIONS SUBJECTED TO LARGE ROTATIONS AND AXIAL LOADS

October 13, 2016
Author(s)
Jonathan M. Weigand, Jeffrey W. Berman
Steel gravity framing systems (SGFSs) rely on connections for system robustness when a column suffers damage that compromises its ability to carry gravity loads. Redistribution of gravity loads through the development of a sustained tensile configuration

The Bugs Framework (BF): A Structured Approach to Express Bugs

October 13, 2016
Author(s)
Irena Bojanova, Paul E. Black, Yaacov Yesha, Yan Wu
To achieve higher levels of assurance for digital systems, we need to answer questions such as, does this software have bugs of these critical classes? Do these two tools generally find the same set of bugs, or different, complimentary sets? Can we

Transmission Electron Microscope Calibration Methods for Critical Dimension Standards

October 13, 2016
Author(s)
Ndubuisi G. Orji, Ronald G. Dixson, Domingo I. Garcia-Gutierrez, Bunday Benjamin, M R. Bishop, Michael W. Cresswell, Richard A. Allen, John Allgair
One of the key challenges in critical dimension (CD) metrology is finding suitable dimensional calibration standards. The transmission electron microscope (TEM), which produces lattice-resolved images having scale traceability to the SI (International

Enhanced connections for improved robustness of steel gravity frames

October 12, 2016
Author(s)
Jonathan Weigand, Joseph Main
Potential vulnerabilities to collapse have been identified for steel gravity framing systems with conventional gravity connections subjected to column loss. To address these potential vulnerabilities, a high-fidelity finite element modeling approach is

Supramolecular Hemicage Cobalt Mediators for Efficient and Stable Dye-Sensitized Solar Cells

October 11, 2016
Author(s)
Lisa A. Fredin, Marina Freitag, Wenxing Yang, Luca D' Amario, K. Martin Karlsson, Anders Hagfeldt, Gerrit Boschloo
A new class of DSCs using the hemicage cobalt based mediator [Co(ttb)] 2+/3+ using the hexadentate ligand 5,5'',5''''-((2,4,6- triethyl highly preorganized benzene-1,3,5-triyl)tris(ethane-2,1- diyl))tri-2,2'- bipyridine (ttb) were studied. Current-voltage

Synchronization of clocks through 12km of strongly turbulent air over a city

October 11, 2016
Author(s)
Laura C. Sinclair, William C. Swann, Hugo Bergeron, Esther Baumann, Michael A. Cermak, Ian R. Coddington, Jean-Daniel Deschenes, Fabrizio R. Giorgetta, Juan Juarez, Isaac H. Khader, Keith G. Petrillo, Katherine T. Souza, Michael L. Dennis, Nathan R. Newbury
We demonstrate real-time, femtosecond-level clock synchronization across a low-lying, strongly turbulent, 12-km horizontal air path by optical two-way time transfer. For this long horizontal free-space path, the integrated turbulence extends well into the

Non-contact Surface Conductance Measurement of Graphene using Resonant Cavity

October 10, 2016
Author(s)
Jan Obrzut, Oleg A. Kirillov
The measurement of conductance by a resonant cavity involves monitoring the resonant frequency shift and change in the quality factor before and after insertion of the specimen into the cavity. The method is applicable to carbon Vapor deposited (CVD)

Recent Advancements of Wide-Angle Polarization Analysis with 3 He neutron Spin Filters

October 10, 2016
Author(s)
WangChun Chen, Thomas R. Gentile, Qiang NMN Ye, A. Kirchhoff, Shannon Watson, Jose A. Rodriguez, Yiming Qiu, Collin L. Broholm
Wide-angle polarization analysis with polarized 3He based neutron spin filters (NSFs) has recently been employed on the Multi-Axis Crystal Spectrometer (MACS) at the National Institute of Standards and Technology Center for Neutron Research (NCNR). Over

A multi-year estimate of methane fluxes in Alaska from CARVE atmospheric observations

October 9, 2016
Author(s)
Anna Karion, Scot Miller, Anna Michalak, Rachel Chang, Steven Dinardo, Jakob Lindaas, Colm Sweeney, Roisin Commane
Methane (CH4) fluxes from Alaska and other arctic regions may be sensitive to thawing permafrost and future climate change, but estimates of both current and future fluxes from the region are uncertain. This study estimates CH4 fluxes across Alaska over a

FINE-TUNING ELECTRICAL FLOW RATE SENSING IN DEFORMABLE CHANNELS

October 9, 2016
Author(s)
Pengfei Niu, Brian J. Nablo, Kiran Bhadriraju, Darwin Reyes-Hernandez
Here we present conclusive proof that when using electrical impedance to measure volumetric flow rate in polydimethylsiloxane (PDMS) microchannels a considerable fraction of the change in impedance, due to change in flow rate, is caused by the variation in

Supramolecular Self-assembly of a Novel Hydrogelator: Characterization of Fiber Morphology and Formation and Thermal-Reversible Gelation

October 8, 2016
Author(s)
Jack F. Douglas, Yuan Gao Yuan Gao, Ryan C. Nieuwendaal, Emilios Dimitriadis, Boualem Hammouda, Bing Xu, Ferenc Horkay
Hydrogels are of intense recent interest in connection with biomedical applications ranging from 3-D cell cultures and stem cell differentiation to regenerative medicine, controlled drug delivery and tissue engineering. This prototypical form of soft

Accurate, Traceable, and Verifiable Time Synchronization for World Financial Markets

October 7, 2016
Author(s)
Michael A. Lombardi, Andrew N. Novick, George Neville-Neil, Ben Cooke
This paper describes how the National Institute of Standards and Technology (NIST), through a collaboration with Perseus, is providing accurate, traceable, and verifiable time synchronization to stock exchanges in the United States, Europe, and Asia. The

Cyber-physical Systems Engineering for Manufacturing

October 7, 2016
Author(s)
Allison Barnard Feeney, Simon P. Frechette, Vijay Srinivasan
There is a convergence of interests in cyber-physical systems, systems engineering, and manufacturing innovation in the United States. The U.S. National Institute of Standards and Technology (NIST) has undertaken research programs in smart manufacturing

Inertial Measurement Unit for On-Machine Diagnostics of Machine Tool Linear Axes

October 7, 2016
Author(s)
Gregory W. Vogl, Alkan Donmez, Andreas Archenti, Brian A. Weiss
Machine tools degrade during operations, yet knowledge of degradation is elusive; accurately detecting degradation of machines' components such as linear axes is typically a manual and time-consuming process. Thus, manufacturers need automated, efficient

Measuring Latency in Location Based ServicesA Public Safety Perspective

October 7, 2016
Author(s)
Casey R. Baer, Vihang S. Jani
Location-based services (LBS) that are able to determine accurately and precisely the location of a first responder are of great interest to public safety organizations. LBS asset positioning is currently not dependent upon network and system performance

Transfer Standard Uncertainty Can Cause Inconclusive Inter-Laboratory Comparisons

October 7, 2016
Author(s)
John D. Wright, Blaza Toman, Bodo Mickan, Gerd Wubbeler, Olha Bodnar, Clemens Elster
Inter-laboratory comparisons use the best available transfer standards to check the participants’ uncertainty analyses, identify underestimated uncertainty claims or unknown measurement biases, and improve the global measurement system. For some measurands

A Thin-Film Cryotron Suitable For Use as an Ultra-Low-Temperature Switch

October 6, 2016
Author(s)
Peter J. Lowell, John A. Mates, William B. Doriese, Gene C. Hilton, Kelsey M. Morgan, Daniel S. Swetz, Joel N. Ullom, Daniel R. Schmidt
Low-temperature superconducting circuits have become important in modern science. However, there are presently no high-current-capacity switches with low power dissipation for sub-Kelvin operation. One candidate for a sub-Kelvin switch is the cryotron, a
Displaying 15151 - 15175 of 73697
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