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Search Publications

NIST Authors in Bold

Displaying 12776 - 12800 of 73697

Flame Spread Along Fences Near a Structure in a Wind Field

October 20, 2017
Author(s)
Kathryn M. Butler, Erik L. Johnsson, Marco G. Fernandez, Mariusz Zarzecki, Eric Auth
Combustible fences have been identified in post-fire investigations of wildland-urban interface (WUI) fires as potential threats to homes and other structures. They may ignite due to direct fire contact or firebrands, they may conduct fire along their

Evaluating the Effects of Modeling Errors for Isolated Finite 3-D Targets

October 19, 2017
Author(s)
Mark Alexander Henn, Bryan M. Barnes, Hui Zhou
Optical 3-D nanostructure metrology utilizes a model-based metrology approach to determine critical dimensions (CDs) that are well below the inspection wavelength. Our project at the National Institute of Standards and Technology is evaluating how to

Two determinations of the Ge-68 half-life

October 19, 2017
Author(s)
Denis E. Bergeron, Jeffrey T. Cessna, Brian E. Zimmerman
In nuclear medicine, 68Ge is used to generate 68Ga for imaging by positron emission tomography (PET) and sealed sources containing 68Ge/68Ga in equilibrium have been adopted as long-lived calibration surrogates for the more common PET nuclide, 18F. We

Algorithm for rapid determination of optical scattering parameters

October 18, 2017
Author(s)
Zachary H. Levine, Adam L. Pintar, Richelle H. Streater, Anne-Michelle R. Lieberson, Catherine C. Cooksey, Paul Lemaillet
Preliminary experiments at the NIST Spectral Tri-function Automated Reference Reflectometer (STARR) facility have been conducted with the goal of providing the diffuse optical properties of a solid reference standard with optical properties similar to

Development of A New Atom-Based SI Traceable Electric-Field Metrology Technique

October 18, 2017
Author(s)
Christopher L. Holloway, Matthew T. Simons, Joshua A. Gordon
We are developing a fundamentally new atom-based approach for Electric (E) metrology. This technique has the capability of becoming a new international standard for E-field measurements and calibrations. Since this new approach is based on atomic

Growth-Induced In-Plane Uniaxial Anisotropy V 2 O 3 /Ni Films

October 18, 2017
Author(s)
Dustin Allen Gilbert, Juan Gabriel Ramirez, T. Saerbeck, J. Trastoy, Ivan K. Schuller, Kai Liu, J. de la Venta
We report a microstructure-induced uniaxial anisotropy in V 2O 3/Ni hybrid thin films obtained from temperature and angular dependence of the magnetization. X-ray diffraction and reciprocal space maps identify the in-plane crystalline axes of the V 2O 3

Interference Tests at Room Temperature Applied to Deployed Low-Noise Receivers

October 18, 2017
Author(s)
Daniel G. Kuester, Duncan A. McGillivray, Adam J. Wunderlich, William F. Young
Wireless interference tests are often performed in shielded anechoic and semi-anechoic chambers near room temperature. The corresponding test condition experienced by a receiver DUT is antenna noise temperature equal to physical room temperature (barring

JDFTx: software for joint density-functional theory

October 18, 2017
Author(s)
Ravishankar Sundararaman, Kendra Letchworth-Weaver, Kathleen Schwarz, Deniz Gunceler, Akif Ozhabes, Tomas Arias
Density-functional theory (DFT) has revolutionized computational prediction of atomic-scale properties from first prin- ciples in physics, chemistry and materials science. Continuing development of new methods is necessary for accurate predictions of new

UV superconducting nanowire single-photondetectors with high efficiency, low noise, and4 K operating temperature

October 18, 2017
Author(s)
Varun Verma, Adriana Lita, Richard Mirin, Sae Woo Nam, Emma Wollman, Andrew Beyer, Ryan Briggs, Francesco Marsili, Jason Allmaras, Matthew Shaw
For photon-counting applications at ultraviolet wavelengths, there are currently nodetectors that combine high efficiency (> 50%), sub-nanosecond timing resolution, and sub-Hz dark count rates. Superconducting nanowire single-photon detectors (SNSPDs) have

An integrated and automated calibration system for pneumatic piston gauges

October 17, 2017
Author(s)
Yuanchao Yang, Robert G. Driver, John S. Quintavalle, Julia Scherschligt, Katie M. Schlatter, Jacob Edmond Ricker, Gregory F. Strouse, Douglas A. Olson, Jay H. Hendricks
Recently, a transducer-aided crossfloat (TAC) method for pneumatic piston gauges was proposed. The concept is to use a pressure transducer as a very short-term transfer standard between the standard piston gauge and the test one. Different from the

Electrochemical capacitance of CO-terminated Pt(111) is dominated by CO-solvent gap

October 17, 2017
Author(s)
Ravishankar Sundararaman, Marta C. Figueiredo, Marc Koper, Kathleen Schwarz
The distribution of electric fields within the electrochemical double layer depends on both the electrode and electrolyte in complex ways. These fields strongly influence chemical dynamics in the electrode-electrolyte interface, but cannot be measured

JY1 Time Scale: a New Kalman-Filter Time Scale Designed at NIST

October 17, 2017
Author(s)
Jian Yao, Thomas E. Parker, Judah Levine
We report on a new Kalman-filter Hydrogen-maser time scale (i.e., JY1 time scale) designed at NIST. The JY1 time scale is composed of a few Hydrogen masers and a Cs clock. The Cs clock is used as a reference clock, to ease operations with existing data

Knot Energy, Complexity, and Mobility of Knotted Polymers

October 17, 2017
Author(s)
Luis F. Vargas Lara, Ahmed M. Hassan, Marc A. Mansfield, Jack F. Douglas
The Newtonian capacity C of an object is defined by the equilibrium energy, EN =1/C, of a charge distribution on a conductive object and provides a classical measure of object shape. It is well known, for example, that C is minimized for a sphere for all

An Overview of Activities at NIST Towards the Proposed ASTM E57 3D Imaging System Point-to-Point Distance Standard

October 16, 2017
Author(s)
Prem K. Rachakonda, Balasubramanian Muralikrishnan, Katharine M. Shilling, Geraldine S. Cheok, Daniel S. Sawyer
The Dimensional Metrology Group (DMG) at the National Institute of Standards & Technology (NIST), along with various other organizations has been involved in the development of a documentary standard for 3D imaging instruments that acquire data in
Displaying 12776 - 12800 of 73697
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