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NIST Authors in Bold

Displaying 71626 - 71650 of 74421

Details of the 1998 Watt Balance Experiment Determining the Planck Constant

Author(s)
Richard L. Steiner, David B. Newell, Edwin R. Williams
The National Institute of Standards and Technology (NIST) watt balance experiment completed a determination of Planck's constant in 1998 with a relative standard uncertainty of 87 x 10-9 (k = 1), concurrently with an upper limit on the drift rate of the SI

Determination of Sulfur and Sulfate Half-ester Content in Cellulose Nanocrystals: An Interlaboratory Comparison

Author(s)
Linda Johnston, Zygmun Jakubek, Stephanie Beck, Jun Arak, Emily Cranston, Christoph Danumah, Douglas Fox, Li Haifeng, Zoltan Mester, Audrey Moores, Savelas A. Rabb, Karen E. Murphy, Chady Stephan
Charged functional groups on the surface of cellulose nanocrystals (CNCs) are important for controlling the colloidal stability of suspensions and the interaction of the material with its environment for most applications. Quantification of surface groups

Development of a miniature radiation pressure-measuring microscale

Author(s)
Ivan Ryger, Alexandra B. Artusio-Glimpse, Paul A. Williams, Nathan A. Tomlin, Michelle S. Stephens, Matthew T. Spidell, John H. Lehman
Traditional methods for accurate measurement of high-power lasers involve total absorption of the laser light [1]. Our method, however, measures photon pressure exerted on a mirror without obstruction of the laser beam. The technique enables in situ

dint u say that: Digital Discourse, Digital Natives and Gameplay

Author(s)
Theresa O'Connell, John D. Grantham, Wyatt Wong, Kevin Workman, Alexander Wang
Traditional, new and modified discourse analysis methods were applied to a corpus of 858 discrete gameplay discourse events disclosing discourse characteristics during collaborative problem solving. Four teams of four digital natives each played

Direct Synthetic Control over the Size, Composition, and Photocatalytic Activity of Octahedral Copper Oxide Materials: Correlation between the Surface Structure and Catalytic Functionality

Author(s)
Nicholas M. Bedford, Michelle A. Nguyen, Yang Ren, Robert C. Goodin, Fatima Chagani, Elsayed M. Zahran, Leonidas G. Bachas, Marc Knecht
Here, we report a synthetic approach to form octahedral Cu2O microcrystals with a tunable edge length and demonstrate their use as catalysts for the photodegradation of aromatic organic compounds. Varying the ratio and concentrations of Cu2+ and reductant

Dynamic Calibration for Instruments

Author(s)
Robert C. Hagwood
The NIST Pressure Measurements Division provides calibration service for pressure instruments that customers in turn use to calibrate other instruments. Often during their useable lifetime, these instruments are calibrated and recalibrated several times at

Dynamics of DNA in and Around a Nanopore

Author(s)
Robert C. Hagwood
Single stranded DNA is modeled as a flexible polymer. The motion of such DNA in a vessel partitioned by a membrane containing a cylindrical nanopore is modeled. Statistical quantities such as the probability that a polymer end is at the pore entrance at

Estimating Error Discovery in Library Conformance Testing

Author(s)
Gordon E. Lyon
Procedure libraries provide fresh insight into unit conformance testing. The library specification, as an ensemble, offers cost estimates for error discovery even prior to obtaining code to test. One extracts or decides counts of: (i) formal parameters for

ESTIMATING UNCERTAINTY LIMITS IN THE NIST-2008 ELECTRONIC KILOGRAM

Author(s)
Richard L. Steiner, Edwin R. Williams, Ruimin Liu, Beatrice Parker
The NIST electronic kilogram has had three published results, each with slightly less uncertainty. In the present design, there are several measurement components that have uncertainties that are difficult to reduce further. These limiting uncertainties

Feedback control of a nonlinear electrostatic force transducer

Author(s)
Ivan Ryger, Stefan Chamraz, Richard Balogh, Alexandra B. Artusio-Glimpse, Michelle S. Stephens, John H. Lehman, Paul A. Williams
In this article, we document a design process for a feedback controller for a nonlinear electrostatic transducer that exhibits a strong unloaded resonance. This is being used for precision optical power measurement by means of a photon force measurement

Framework for Performance Evaluation of Face, Text, and Vehicle Detection and Tracking in Video: Data, Metrics, and Protocol

Author(s)
Rangachar Kasturi, D Goldgof, K Soundararajan, V Manohar, M Boonstra, V Korzhova, J Zhang, Rachel J. Bowers, John S. Garofolo
Common benchmark datasets, standardized performance metrics, and baseline algorithms have demonstrated considerable impact on research and development in a variety of application domains. These resources provide both consumers and developers of technology

Green Fluorescent Protein in Inertially Injected Aqueous Nanodroplets

Author(s)
Jianyong Tang, Ana Jofre, G M. Lowman, Rani B. Kishore, Joseph E. Reiner, Kristian Helmerson, Lori S. Goldner, M E. Greene
individual hydrosomes into an immiscible solvent matrix composed of perfluorotriamylamine. Hydrosomes containing EGFP were optically trapped held at the focus of an excitation laser in a confocal microscope, and single molecule photobleaching events were

Handover-based Call Admission Control in Heterogeneous Wireless Networks

Author(s)
Nicolas Chevrollier, Nada T. Golmie, Nicolas Montavont
With the need for mobility comes stringent quality of service requirements that have to be met before users are able to roam seamlessly across different network infrastructures. In this paper we investigate the use of a handover-based call admission

Improvements in the Winkler Titration for Iodide in Iodized Salt

Author(s)
Kenneth W. Pratt, Karen E. Murphy
A bromine gas generator, based on bleach, potassium bromide and dilute hydrochloric acid, replaces hazardous pure bromine used in the classical Winkler titration for iodide. This modification eliminates the need to store or use pure bromine. The gas

Influence of Aggregate Properties on Concrete Mechanical Performance

Author(s)
Jussara Tanesi, Dale P. Bentz, Scott Z. Jones, Mengesha Beyene, Haejin Kim, Ahmad Ardani, Paul E. Stutzman
While the influence of paste properties on concrete performance has been extensively studied, that between aggregate characteristics and concrete performance has not been investigated in detail. Based on previous research that demonstrated significant

Inter-comparison Example

Author(s)
Adriana Hornikova, Maritoni A. Litorja, Stefan D. Leigh, J B. Fowler
This paper overviews results from Consultative Committee on Photometry and Radiometry (CCPR) the Supplementary Comparison S2. It details measurement and analysis of aperture areas involving 9 laboratories using 8 distinct artifacts, each having a different

Is Bonds Out

Author(s)
Robert C. Hagwood
In this paper, the cumulative home run rates of the 20 players with 500 or more home runs are analyzed. We show that Bonds and McGwire have cumulative totals that lie statistically outside the others in the study.
Displaying 71626 - 71650 of 74421
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