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Displaying 71726 - 71750 of 74528

Buckling of steel gusset plates

Author(s)
Chiara Crosti, Dat Duthinh
As a result of the structural failure of the I-35W bridge in Minneapolis in 2007, FHWA issued guidelines for the load rating of gusset plates and recommended that the capacity of these plates on non-load-path-redundant steel truss bridges be verified. The

Characterizing and Fractionating Native Cellulose Nanofibers

Author(s)
Iulia A. Sacui, Jeffrey W. Gilman
Cellulose nanofibers have good elastic modulus properties and can be used as nano-reinforcements in polymer composites. Native cellulose nanofibers from wood, Tunicate, and bacteria (Acetobacter xylium) were characterized by atomic force microscopy (AFM)

Coercivities Above 10 kOe in CoPd Superlattices

Author(s)
William F. Egelhoff Jr., Cedric J. Powell, L Gan, P J. Chen, H Ettedgui, D Tirosh, Robert D. McMichael, Mark D. Stiles, J Mallett, Alexander J. Shapiro, John E. Bonevich, J H. Judy, Erik B. Svedberg, A. E. Berkowitz
We have achieved excellent grain isolation in CoPd superlattices by using 10 nm Au as both an underlayer and an overlayer and diffusing Au into the grain boundaries by annealing for {approximately equal to} 30 min. at 300 degrees C. The grain isolation

Coexistence calculation using the Isothermal-Isochoric Integration Method

Author(s)
Seyed M. Razavi, Richard A. Messerly, J. R. Elliott
In this work, an isothermal-isochoric integration (ITIC) method is proposed and tested as a viable method for vapor pressure calculation by molecular simulation. Several tests were carried out to validate the method which resulted in less than 1 %

Colliding Self-Assembly Waves in Organosilane Monolayers

Author(s)
K Efimenko, Ali Ozcam, Jan Genzer, Daniel A. Fischer, Frederick R. Phelan Jr., Jack F. Douglas
Colliding autocatalytic wave-fronts of organosilane (OS) layer self-assembly are generated through the controlled positioning of sources of the volatile OS material at the edges of a silica wafer and through adjustment of the container dimensions in which

Common Metrics for Human-Robot Interaction

Author(s)
Aaron Steinfeld, Terrance Fong, David Kaber, Michael Lewis, Jean C. Scholtz, Alan Schultz, Michael Goodrich
This paper describes an effort to identify common metrics for task-oriented human-robot interaction (HRI). We begin by discussing the need for a toolkit of HRI metrics. We then describe the framework of our work and identify important biasing factors that

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
Displaying 71726 - 71750 of 74528
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