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Search Publications

NIST Authors in Bold

Displaying 2576 - 2600 of 2934

Study of Azeotropic Mixtures with the Advanced Distillation Curve Approach

April 11, 2009
Author(s)
Amelia Hadler, Lisa S. Ott, Thomas J. Bruno
Classical methods for the study of complex fluid phase behavior include static and dynamic equilibrium cells that usually require vapor and liquid recirculation. These are sophisticated, costly apparatus that require highly trained operators, usually

Improving Correlations with Inelastic Loss

June 6, 2008
Author(s)
James V. Porto
Correlations are one of the central features of modern condensed matter physics. They arise in systems where the behavior of any given particle in a system depends strongly on all the other particles. Such correlations are what help distinguish the

Reverse Engineering the Brain

November 9, 2007
Author(s)
James S. Albus
Reverse engineering the brain will require a deep understanding of how information is represented and how computation is performed in the brain. What are the functional operations? What are the knowledge data structures? How are messages encoded? How are

Voltage Instability in a Simulated Fuel Cell Stack Correlated to Cathode Water Accumulation

July 22, 2007
Author(s)
Jon P. Owejan, T Trabold, Jeffrey J. Gagliardo, Robert N. Carter, Daniel S. Hussey, David L. Jacobson, Muhammad D. Arif
Single fuel cells running independently are often used for fundamental studies of water transport. It is also necessary to assess the dynamic behavior of fuel cell stacks comprised of multiple cells arranged in series, thus providing many paths for flow of

On the Vickers Indentation Fracture Toughness Test

January 4, 2007
Author(s)
George D. Quinn, Richard Bradt
The Vickers indentation fracture toughness test or VIF is addressed by considering its origins and the numerous equations that have been applied along with the technique to estimate the fracture resistance, or the KIc of ceramics. Initiation and

Media Longevity Sidebar for INSIC

August 1, 2006
Author(s)
Oliver T. Slattery
The long-term preservation of digital data is a fundamental objective for many government agencies, businesses and individuals alike. With positive claims from manufacturers with regard to longevity, optical media has generated interest among the archival

Ab Initio Structure of the Active Site of Phosphotriesterase

February 1, 2001
Author(s)
Morris Krauss
This research exploits two recent developments to obtain a fundamental understanding of the metalloenzyme active site using the bi-metallic enzyme phosphotriesterase as an example of this class. First, is the theoretical prediction that the structure and

Treasure of the Past: II. The Atomic Weight of Bromine

July 1, 2000
Author(s)
Alan Weber
A considerable amount of work has been done in order to determine the atomic weight of bromine and the oft-repeated comparison of the atomic weights of silver and bromine makes it seem that this ratio is known with considerable accuracy. The value accepted

The Infrared Spectrum and Internal Rotation Barrier in HF--BF 3

May 1, 2000
Author(s)
K Nauta, R E. Miller, Gerald T. Fraser, Walter J. Lafferty
The rotationally resolved infrared spectrum of the HF stretch fundamental in combination with one quantum of internal rotationexcitation has been observed for the HF--BF 3 complex using a color-center-laser optothermal molecular-beam spectrometer.This

Watt's Up, Doc? The NIST Watt Experiment and the Future of the Kg

March 21, 2000
Author(s)
J. Schwarz, Ruimin Liu, David B. Newell, Richard L. Steiner, Edwin R. Williams
The Nist Watt Balance is an interesting and beautiful experiment housed in the nonmagnetic building behind the reactor. The underlying physical principles of the experiment are very simple: a current in a magnetic gradient will produce a force that is

Optimization of Polymer Concrete Composites: Final Report

August 1, 1999
Author(s)
L Czarnecki, A Garbacz, P Lukowski, J R. Clifton
The main aim of the study was the development of a method for the design and optimization of polymer concrete composites, using a fundamental approach based on a material model of polymer concrete. The polymer concrete materials were characterized via

Char Enhancing Approaches to Flame Retarding Polymers

February 1, 1998
Author(s)
Jeffrey W. Gilman, Takashi Kashiwagi, Richard H. Harris Jr., S M. Lomakin, J D. Lichtenhan, A. Bolf, P. Jones
Additives that increase the amount of charcoal-like residue or carbonaceous char that forms during polymer combustion are very effective fire retardants (FR). Our research efforts focus on reducing polymer flammability by promoting char formation. Our

Advances in NIST Standard Rockwell Diamond Indenters

January 1, 1998
Author(s)
Jun-Feng Song, Samuel R. Low III, David J. Pitchure, Theodore V. Vorburger
Recent developments in standard hardness machines and microform calibration techniques have made it possible to establish a worldwide unified Rockwell hardness scale with metrological traceability. This includes the establishments of the reference

Interactive Process Planning in the AMRF

October 1, 1986
Author(s)
Peter Brown, Charles R. McLean
In designing a process planning system for the AMRF, the primary issue was not whether the system process, from specification through production, and retaining the information generated for later analysis or reuse. The objective of CIM is to improve the

Broadband pulsed quadrature measurements with calorimeters

December 8, 2025
Author(s)
Ezad Shojaee, James R. van Meter, Karl Mayer, Scott Glancy, Emanuel Knill
A general one-dimensional quantum optical mode is described by a shape in the time or frequency domain. A fundamental problem is to measure a quadrature operator of such a mode. If the shape is narrow in frequency this can be done by pulsed homodyne

Vitamin E Acetate Causes Softening of Pulmonary Surfactant Membrane Models

February 19, 2025
Author(s)
Mitchell DiPasquale, Maksymilian Dziura, Omotayo Gbadamosi, Stuart R. Castillo, Ambreen Fahim, Justin Roberto, Jeffrey Atkinson, Natalie Boccalon, Mario Campana, Sai Pingali, P. C. Chandrasekera, Piotr Zolnierczuk, Michihiro Nagao, Elizabeth Kelley, Drew Marquardt
The popularity of electronic cigarettes and vaping products has launched the outbreak of a condition affecting the respiratory system of users, known as electronic-cigarette/vaping-associated lung injury (EVALI). The build-up of vitamin E acetate (VEA), a

Test Facility for Pressure Losses in Plumbing Pipes and Fittings

July 15, 2024
Author(s)
Lingnan Lin, Natascha S. Milesi-Ferretti, Glen A. Glaeser
This report describes a new test facility at NIST for the measurement of pressure losses in pipes and fittings used in plumbing systems. Pressure losses are fundamental inputs to the design of premise plumbing systems, yet the available technical data on

Building Seismic Stability - Code Provisions vs. Inelastic Behavior

June 30, 2024
Author(s)
Larry Fahnestock, Shitao Shi, Matthew Speicher
In a building, seismic stability is provided when the internal restoring forces resist the effective earthquake forces plus the destabilizing effects of gravity that arise when the building displaces laterally. Although this concept can be succinctly

The Black Hole Explorer: Motivation and Vision

June 13, 2024
Author(s)
Michael D. Johnson, Kazunori Akiyama, Rebecca Baturin, Bryan Bilyeu, Lindy Blackburn, Don Boroson, Alejandro Cardena-Avendano, Andrew Chael, Chi-kwan Chan, Dominic Chang, Peter Cheimets, Cathy Chou, Sheperd S. Doeleman, Joseph Farah, Peter Galison, Ronald Gamble, Charles F. Gammie, Zachary Gelles, Jose L. Gomez, Samuel E. Gralla, Paul Grimes, Shahar Hadar, Kari Haworth, Kazuhiro Hada, Michael H. Hecht, Mareki Honma, Janice Houston, Ben Hudson, Sara Issaoun, He Jia, Svetlana Jorstad, Jens Kauffmann, Yuri Kovalev, Leonid I. Gurvits, Peter Kurczynski, Robert Lafon, Alexandru Lupsasca, Robert Lehmensiek, Chung-Pei Ma, Daniel P. Marrone, Alan P. Marscher, Gary J. Melnick, Ramesh Narayan, Kotaro Niinuma, Scott C. Noble, Eric J. Palmer, Daniel C. Palumbo, Lenny Paritsky, Eliad Peretz, Dominic Pesce, Alexander Plavin, Eliot Quataert, Hannah Rana, Angelo Ricarte, Freek Roelofs, Katia Shtyrkova, Laura Sinclair, Jeffrey Small, Sridharan Tirupati Kumara, Ranjani Srinivasan, Andrew Strominger, Paul Tiede, Edward Tong, Jade Wang, Jonathan Weintroub, Maciek Wielgus, George Wong, Xinyue Alice Zhang
We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry (VLBI) to space. BHEX will discover and measure the bright and narrow
Displaying 2576 - 2600 of 2934
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