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Search Publications

NIST Authors in Bold

Displaying 12876 - 12900 of 73697

Chemical and Physical Changes During Seawater Flow through Intact Dunite Cores: An Experimental study at 150-200 degC

October 1, 2017
Author(s)
Andrew J. Luhmann, Benjamin M. Tutolo, Brian C. Bagley, David F. Mildner, Peter P. Scheuermann, Joshua M. Feinberg, Konstantin Ignatyev, Jr. Seyfried
Two flow-through experiments were conducted to assess serpentinization of intact dunite cores. Permeability and fluid chemistry indicate significantly more reaction during the second experiment at 200 °C than the first experiment at 150°C. Permeability

Even Small Factories Can Get Smarter

October 1, 2017
Author(s)
Thomas D. Hedberg, Moneer M. Helu
Smart manufacturing uses data to deliver value the way automation, mechanical machinery, and labor did in the past. Yet engineers often worry that transitioning to smarter factories involves navigating a deluge of unfamiliar and possibly expensive

Film Confinement Induced "Jump-Percolation" Wetting Transition in Amphiphilic Block Copolymer Films

October 1, 2017
Author(s)
Namrata Salunke, Asritha Nallapaneni, Guangcui Yuan, Christopher Stafford, Hui Niu, Matthew D. Shawkey, R. A. Weiss, Alamgir Karim
A sharp surface wettability transition with varying film thickness dependent morphology was observed in cast films of an amphiphilic triblock copolymer comprised of poly(2-(N-ethylperfluotooctanesulfonamido) ethyl methylacrylate), poly(FOSM), and poly(N,N'

Polarized Light Scattering of Smoke Sources and Cooking Aerosols

October 1, 2017
Author(s)
Thomas Cleary, Amy Mensch
Light scattering data was gathered during experiments conducted in an ANSI/UL 217 test room constructed at NIST to assess the performance of currently available smoke alarms. Smoldering and flaming fires along with cooking experiments were conducted. The

Wireless Infrastructure M2M Network For Distributed Power Grid Monitoring

October 1, 2017
Author(s)
Hamid Gharavi
With the massive integration of distributed renewable energy sources (RESs) into the power system, the demand for timely and reliable network quality monitoring, control, and fault analysis is rapidly growing. Following the successful deployment of Phasor

Supplement 2 to the 2004 update of the AAPM Task Group No. 43 1 Report: Joint recommendations by the AAPM and GEC-ESTRO

September 30, 2017
Author(s)
Michael G. Mitch, Mark J. Rivard, Facundo Ballester, Wayne M. Butler, Larry A. DeWerd, Geoffrey S. Ibbott, Christopher Melhus
Since publication of the 2004 update to the American Association of Physicists in Medicine (AAPM) Task Group No. 43 Report (TG-43U1) and its 2007 supplement (TG-43U1S1), several new low- energy photon-emitting brachytherapy sources have become available

Temperature dependence of nonlinearity in high-speed, high-power photodetectors

September 30, 2017
Author(s)
Josue Davila-Rodriguez, Holly Leopardi, Tara Fortier, Xiaojun Xie, Joe C. Campbell, James Booth, Nate Orloff, Scott Diddams, Franklyn Quinlan
We present an experimental study of the nonlinearity of modified uni-traveling carrier (MUTC) photodiodes at cryogenic temperatures. At 120 K, the amplitudeto-phase (AM-to-PM) conversion nonlinearity is reduced by up to 10 dB, resulting in nearly 40 dB AM

The Role of Filtering Higher Order Reflections in Antenna Extrapolation Measurements

September 30, 2017
Author(s)
Rob Horansky, Mohit S. Mujumdar, Dylan Williams, Kate Remley, David R. Novotny, Michael H. Francis
With more and more wireless devices being made with no test ports, and with the need to test these devices in real-world scenarios with no cable interference, over-the-air (OTA) testing has been dominating the test and manufacture industry. At NIST, we are

Alexa, Can I Trust You?

September 29, 2017
Author(s)
Judy Chung, Michaela Iorga, Jeff Voas, Sangjin Lee
Security diagnostics expose vulnerabilities and privacy threats that exist in commercial Intelligent Virtual Assistants (IVA)-- diagnostics offer the possibility of securer IVA ecosystems. This paper explores security and privacy concerns with these

Nanostructural Evidence of Mechanical Aging and Performance Loss in Ballistic Fibers

September 29, 2017
Author(s)
John Howarter, Ming Liu, Walter G. McDonough, Christopher Soles, Gale A. Holmes
It is understood that the ballistic resistance of aromatic polyamide fibers is related to the fiber's ultimate tensile strength, strain-to-failure, and Young's modulus. Ideal high-performance ballistic materials maximize these properties while minimizing

A Methodology for Estimating Seismic Retrofit Costs

September 28, 2017
Author(s)
Juan F. Fung, David T. Butry, Siamak Sattar, Steven L. McCabe
Presidential Executive Order 13717 (EO 13717), Establishing a Federal Earthquake Risk Management Standard, encourages federal agencies to ”enhance resilience...[to] future earthquakes” by evaluating and retrofitting existing federal buildings based on

Aperture Arrays for Subnanometer Calibration of Optical Microscopes

September 28, 2017
Author(s)
Craig Copeland, Craig McGray, Jon Geist, James Alexander Liddle, Robert Ilic, Samuel Stavis
We fabricate and test subresolution aperture arrays as calibration devices for optical localization microscopy. An array pitch with a relative uncertainty of approximately three parts in ten thousand enables magnification calibration with subnanometer
Displaying 12876 - 12900 of 73697
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