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Displaying 27301 - 27325 of 74079

Shannon Limits for Low-Temperature Detector Readout

July 20, 2009
Author(s)
Kent D. Irwin
Information theory places constraints on multiplexing large low-temperature detector arrays. We discuss these constraints, and review the state of the art of multiplexed low-temperature detector arrays. The number of detectors read out by each output

Is spam an issue for opinionated blog post search?

July 19, 2009
Author(s)
Ian M. Soboroff, Craig Macdonald, Iadh Ounis
In opinion-finding, the retrieval system is tasked with re- trieving not just relevant documents, but those that also express an opinion towards the query target entity. This task has been studied in the context of the blogosphere by groups participating

Using 3D Head and Respirator Shapes to Analyze Respirator Fit

July 19, 2009
Author(s)
Kathryn M. Butler
A computational approach to analyzing respirator fit is demonstrated using geometries generated by laser scanning, mechanical drawings, and CAD files. Three fit-related problems that can be solved using computational tools are demonstrated: 1) The study of

A Guide to the RIA Workshop Data Archive

July 18, 2009
Author(s)
Ian M. Soboroff
During the course of the Reliable Information Access (RIA) workshop, a data archive was created to hold the outputs of the many experiments being done. This archive was designed to serve both as an organizational structure to support the researchers at the

Modification of magnetotransport properties across patterned GaMnAs nanoconstrictions by application of high current densities

July 17, 2009
Author(s)
David P. Pappas, Fabio Cesar Da Silva, Teresa Osminer, Sung Un Cho, Hyung Choi, Chan Yang, Yun Park
We report on the modification of magnetotransport properties across patterned GaMnAs nanoconstrictions by the application of high current densities (< 107 A/cm2). We observe controllable changes in the electrical resistance with the direction of the bias

The Virtual Cybernetic Building Testbed-A Building Emulator

July 16, 2009
Author(s)
Steven T. Bushby, Michael A. Galler, Natascha S. Milesi-Ferretti, Cheol D. Park
Building emulators couple computer simulations to real control hardware, creating a useful tool for studying building control system performance. The National Institute of Standards and Technology's Virtual Cybernetic Building Testbed (VCBT) is a whole

An infrared imaging high-throughput combinatorial method for investigating new phase formation and hydrogen storage capacities of thin films

July 15, 2009
Author(s)
Jason Hattrick-Simpers, Leonid A. Bendersky, Edwin J. Heilweil, H. Oguchi, Ichiro Takeuchi
We have refined and expanded on the capabilities of rapid screening, which utilizes infrared (IR) emissivity imaging. A complete procedure for using infrared emissivity to characterize the hydrogen storage properties of thin-film samples is described. The

Approaches to color rendering measurement

July 15, 2009
Author(s)
Wendy L. Davis, Yoshihiro Ohno
Color rendering refers to a light source’s ability to make the colors of illuminated objects appear natural or accurate. The Color Rendering Index (CRI) is currently the only internationally-standardized way to assess a light source’s color rendering

Coherent linear optical sampling at over 15 bits of resolution

July 15, 2009
Author(s)
Ian R. Coddington, William C. Swann, Nathan R. Newbury
Linear optical sampling characterizes a sample by measuring the distortions on a transmitted optical field, thereby quantifying the sample's optical response. By exploiting the high mutual coherence between two phase-locked femtosecond fiber lasers, we

Degradation and Nanofiller Release of Polymer Nanocomposites Exposed to UV

July 15, 2009
Author(s)
Tinh Nguyen, Bastien T. Pellegrin, Alexander J. Shapiro, Xiaohong Gu, Joannie W. Chin
Nanofillers are increasingly used to enhance multifunctional properties of polymers. However, recent research suggests that nanomaterials may have a negative impact on the environmental health and safety. Since polymers are susceptible to photodegradation

Estimating Volumes of Simulated Lung Cancer Nodules

July 15, 2009
Author(s)
David E. Gilsinn, Bruce R. Borchardt, Amelia Tebbe
Lung cancer is a disease of uncontrolled cell growth in tissues of the lung. Computed tomography (CT) shows promise in detecting lung cancers at earlier, more operable stages, when survival is better. CT scans generate multiple 2-D slice images of the lung

Nanoscale Measurements with a Through-Focus Scanning-Optical-Microscope

July 15, 2009
Author(s)
Ravikiran Attota, Richard M. Silver, Thomas A. Germer
We present a novel optical technique that produces nanometer dimensional measurement sensitivity using a conventional optical microscope, by analyzing through-focus scanning-optical-microscope (TSOM) images obtained at different focus positions. In

At-Wavelength Metrology for EUV Lithography at NIST

July 14, 2009
Author(s)
Charles S. Tarrio, Steven E. Grantham, Robert E. Vest, Thomas B. Lucatorto
The National Institute of Standards and Technology (NIST) is active in many areas of metrology impacting extreme ultraviolet lithography. We will describe our activities in the areas of reflectometry, pulsed radiometry, and long-term multiplayer mirror

Characterization of Fly Ash Reactivity in Hydrating Cement by Neutron Scattering

July 14, 2009
Author(s)
W Bumrongjaroen, Richard A. Livingston, Dan A. Neumann, Andrew J. Allen
A combination of small-angle and inelastic neutron scattering studies are presented to elucidate the different effects of Class F and Class C fly ash additions on microstructure development in hydrating cement (and concrete). Small angle neutron scattering

A Framework for Testing Distributed Healthcare Applications

July 13, 2009
Author(s)
Robert D. Snelick, Leonard E. Gebase, Gavin W. O'Brien
We present an architectural framework for supporting conformance and interoperability testing among distributed healthcare systems. Healthcare organizations such as hospitals employ information systems that are composed of multiple, distributed

Assessing Approaches for Evaluating Remote Heterogeneous Applications

July 13, 2009
Author(s)
Leonard E. Gebase, Robert D. Snelick
We examine several methods for testing disparate, heterogeneous systems that intercommunicate through message exchanges governed by a set of well defined message exchange rules. Rather than basing our assessment on a set of abstract applications, we will

Connecting Buildings to Public Safety Networks

July 13, 2009
Author(s)
Alan B. Vinh, David G. Holmberg
The operation of modern buildings can support a vast amount of static and real-time data. Static information such as building schematics is vital for security and rescue purposes. First responders can be notified of designated building alerts in real-time

Frustrated magnetization reversal in Co/Pt multilayer films

July 13, 2009
Author(s)
Joseph E. Davies, O Hellwig, Eric E. Fullerton, M. Winklhofer, Robert D. Shull, Kai Liu
The magnetization reversal behavior in Co/Pt multilayers with perpendicular anisotropy are studied by the first order reversal curve (FORC) method. In addition to the previously observed three stage reversal process where domains first nucleate, then

Intensity dynamics in semiconductor laser arrays

July 13, 2009
Author(s)
Kevin L. Silverman, Mingming M. Feng, Richard P. Mirin, Steven T. Cundiff, Matt Williams, J. Nathan N. Kutz
The dynamics of a five-emitter semiconductor laser array is studied theoretically with steady-state, oscillatory, and chaotic behaviors achieved. This provides a design tool for achieving oscillations whose frequency is related to injection current.
Displaying 27301 - 27325 of 74079