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NIST Authors in Bold

Displaying 10976 - 11000 of 73898

Flux-tunable phase shifter for microwaves

November 7, 2017
Author(s)
Roope J. Kokkoniemi, Tuomas Ollikainen, Sakari Saarenpaa, Janne Kokkala, Ceren Dag, Mikko Mottonen, Russell Lake
We introduce a magnetic-flux-tunable phase shifter for propagating microwave photons, based on three equidistant superconducting quantum interference devices (SQUIDs) on a transmission line. We experimentally implement the phase shifter and demonstrate

Results of an International Comparison of Activity Measurements of 68Ge

November 7, 2017
Author(s)
Jeffrey T. Cessna, Ryan P. Fitzgerald, Brian E. Zimmerman, Lizbeth Laureano-Perez, Denis E. Bergeron
An international key comparison, identifier CCRI(II)-K2.Ge-68, has been performed. The National Institute of Standards and Technology (NIST) served as the pilot laboratory, distributing aliquots of a 68Ge/68Ga solution. Results for the activity

The power collection method for connection relations: Meixner polynomials

November 7, 2017
Author(s)
Howard Cohl, Michael Baeder, Roberto Costas-Santos, Wenqing Xu
We use and derive connection and connection-type relations for Meixner and Krawtchouk polynomials. These relations are used to derive generalizations of generating functions for these orthogonal polynomials. The coefficients of these generalized generating

Electronic Conductivity in a Porous Vanadyl Prussian Blue Analogue upon Air Exposure

November 6, 2017
Author(s)
Mary Anne Manumpil, Carmen Leal-Cervantes, Matthew R. Hudson, Craig Brown, Hemamala I. Karunadasa
Exposure to humid oxygen or ambient air affords a 5-or-der-of-magnitude increase in the electronic conductivity of a new Prussian blue analog incorporation Co(II) and V(IV)-oxo units. Oxidation produces a mixed-valence framework, where the oxygen exposure

Quantum Estimation of the Classical Gravitational Field

November 6, 2017
Author(s)
Emanuel H. Knill, T. G. Downes, G. J. Milburn, C. M. Caves, J. R. van Meter
Here we describe a quantum limit to measurement of the classical gravitational field. Specifically, we formulate the quantum Cramer-Rao lower bound for estimating the single parameter in any one- parameter family of spacetime metrics. We employ the locally

Design Patterns for Visualization-Based Tools in Sustainable Product Design

November 5, 2017
Author(s)
Deverajan Ramanujan, William Z. Bernstein, Karthik Ramani
Most design activities involve exploring and comparing similar existing designs. Thus, adopting an eco-conscious approach in the design exploration process can aid environmentally sustainable product design (SPD). A promising approach for supporting

Deriving global OH abundance and atmospheric lifetimes for long-lived gases: A search for the alternative reference gas for CH3CCl3.

November 3, 2017
Author(s)
Qing Liang, Martyn P. Chipperfield, Eric L. Fleming, Luke Abraham, Peter Braesicke, James B. Burkholder, John S. Daniels, Sandip Dhomse, Steven C. Hardiman, Charles H. Jackman, Douglas E. Kinnison, Stephen A. Montzka, Olaf Morgenstern, Archie McCulloch, Paul A. Newman, Vladimir L. Orkin, Giovanni Pitari, Matthew Rigby, Eugene Rozanov, Fiona Tummon, Guus J. Velders, Daniele Visioni
An accurate estimate of global hydroxyl radical (OH) abundance is important for projections of air quality, climate, and stratospheric ozone layer recovery. As atmospheric concentration of methyl chloroform (MCF), the commonly used reference gas for OH

The Effects of Burial Diagenesis on Multiscale Porosity in the St. Peter Sandstone: An Imagine, Small-Angle, and Ultra-Small-Angle Neutron Scattering Analysis

November 4, 2017
Author(s)
Lawrence M. Anovitz, Jared T. Freiburg, Matthew J. Wasbrough, David F. Mildner, Kenneth C. Littrell, Vitaliy Pipich, Jan Ilavsky
To examine the effects of burial diagenesis on heirarchical pore structures in sandstone and compare those with the effects of overgrowth formation, we obtained samples of St. Peter Sandstone from drill cores obtained in the Illinois and Michigan Basins

Deriving global mean OH and atmospheric lifetimes for ozone-depleting substances and greenhouse gases using observed CH3CCl3 and chemistry-climate models

November 3, 2017
Author(s)
Vladimir L. Orkin, Qing Liang, Martyn P. Chipperfield, Matthew Rigby, Olaf Morgenstern, Guus J. Velders, Luke Abraham, Sandip Dhomse, Eric L. Fleming, Steven C. Hardiman, Daniela Iachetti, Charles H. Jackman, Douglas E. Kinnison, Giovanni Pitari, Eugene Rozanov, Andrea Stenke, Fiona Tummon, James B. Burkholder
Tests using flux-based methyl chloroform (MCF) concentrations from four state-of-the-art chemistry-climate models (CCMs) in the two-dimensional 12-box Bayesian inversion model (IM) indicate that the 12-box IM provides a reasonable estimate of global mean

Effect of the Additive Manufacturing Process on Cutting Forces in Hybrid Manufacturing

November 3, 2017
Author(s)
Michael Gomez, Andrew Honeycutt, Jarred C. Heigel, Tony Schmitz
Powder bed fusion (PBF) enables metal components with complex geometries to be made via additive manufacturing (AM). Disadvantages of AM are rougher surface finish and lower achievable dimensional tolerances compared to computer numerically-controlled (CNC

HIGH EFFICIENCY CARBON NANOTUBE THREAD ANTENNAS

November 3, 2017
Author(s)
Christopher L. Holloway, Aydin Babajgabni, Chris Long, David R. Novotny, Nate Orloff, E. A. Bengio, Damir Senic, Lauren W. Taylor, Dimitri E. Tsentalovich
Although previous research has explored the underlying theory of high-frequency behavior of carbon nanotubes (CNTs) and CNT bundles for antennas, there is a gap in the literature for direct experimental measurements of radiation efficiency. These

Method to Determine the Center of a Contrast Target from Terrestrial Laser Scanner Data

November 3, 2017
Author(s)
Prem K. Rachakonda, Balasubramanian Muralikrishnan, Daniel S. Sawyer, Ling Wang
Terrestrial laser scanners (TLSs) are instruments that can measure 3D coordinates of objects at high speed resulting in high density 3D point cloud data without the necessity of a cooperative target. Contrast targets, also known as checkerboard targets

Model of Mobile Manipulator Performance Measurement using SysML

November 3, 2017
Author(s)
Roger V. Bostelman, Sebti Foufou, Tsai H. Hong, Mili Shah
Test methods for measuring safety and performance of mobile manipulators have yet to be developed. Therefore, potential mobile manipulator users cannot compare one system to another. Systems Modeling Language (SysML) is a general-purpose modeling language

High-Performance Coherent Population Trapping Clock Based on Laser-Cooled Atoms

November 2, 2017
Author(s)
Xiaochi Liu, Eugene Ivanov, V. I. Yudin, John Kitching, Elizabeth Donley
Atomic clocks based on laser-cooled atoms are capable of achieving long interrogation periods and hence narrow resonance linewidths because of the very low atom velocities achievable with laser cooling. The long interrogation periods are achieved without
Displaying 10976 - 11000 of 73898