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Displaying 26326 - 26350 of 73929

Efficient photon pair sources based on Silicon-on-Insulator microresonators

August 30, 2010
Author(s)
Jun Chen, Zachary H. Levine, Jingyun Fan, Alan L. Migdall
We present a general quantum-mechanical formalism to describe photon pair generation via four-wave mixing in a Silicon-on-Insulator (SOI) microresonator. We also provide design principles for efficient photon-pair generation in a SOI microresonator through

Theory for a Dissipative Droplet Soliton Excited by a Spin Torque Nanocontact

August 30, 2010
Author(s)
Mark Hoefer, Thomas J. Silva, Mark W. Keller
A distinct type of solitary wave is predicted to form in spin torque oscillators when the free layer has a sufficiently large perpendicular anisotropy. In this structure, which is a dissipative version of the conservative droplet soliton originally studied

Towards Improved End-to-End System Efficiency of Photon Pair systems

August 30, 2010
Author(s)
Alexander E. Ling, Alan L. Migdall, Jingyun Fan
We report on our efforts in integrating a source and detection system of photon pairs that have a high end-to-end system efficiency. This requires combining appropriate detectors and photon pair sources. Preliminary measurements show that an observed

Trade Collaboration Systems

August 30, 2010
Author(s)
Peter O. Denno
A trade collaboration system (TCS) is a system designed to coordinate the work of supply chain stakeholders involved in the business processes of global logistics. Using the Software as a Service (SaaS) model, the TCS provides a cohesive, process-oriented

Building Occupant Egress Data

August 27, 2010
Author(s)
Richard D. Peacock, Erica D. Kuligowski
Data on people movement on stairs were collected from 9 office and residential building evacuations in the United States. The buildings involved in this study range from 6 stories to 62 stories in height. The data were collected by positioning video

Characterization of Two Spectrmeters in Support of the Landsat Data Continuity Mission

August 27, 2010
Author(s)
Bettye C. Johnson, Robert D. Saunders, Zhigang Li, Abra Fein, Lawrence Ong, Milton Hom, Robert Barnes, B L. Markham
The Landsat Data Continuity Mission (LDCM) project at the National Aeronautics and Space Administration (NASA)Goddard Space Flight Center (GSFC) is supervising the manufacture and calibration of the Operational Land Imager (OLI) satellite instrument by

Carbon Nanotubes: Measuring Dispersion and Length

August 26, 2010
Author(s)
Jeffrey A. Fagan, Barry J. Bauer, Erik K. Hobbie, Matthew Becker, Angela R. Hight Walker, Jeffrey R. Simpson, Jae H. Chun, Jan Obrzut, Vardhan Bajpai, Frederick R. Phelan Jr., Daneesh O. Simien, JiYeon Huh, Kalman D. Migler
Advanced technological uses of single-wall carbon nanotubes (SWCNTs) rely on the production of single length and chirality populations that are currently only available through liquid phase post processing. The foundation of all of these processing steps

Improving the NIST High-Performance ICP-OES Methodology through Exact Matching

August 26, 2010
Author(s)
Michael R. Winchester, Therese A. Butler, Gregory C. Turk
High-Performance” (HP-)ICP-OES was developed at the National Institute of Standards and Technology (NIST) approximately a decade ago as a means of performing ICP OES analyses with relative expanded uncertainty on the order of 0.2 %, expressed at a level of

Microfabricated High-Moment Micrometer-Sized MRI Contrast Agents

August 26, 2010
Author(s)
Gary Zabow, John M. Moreland, Stephen Dodd, alan koretsky, erik shapiro
While chemically synthesized superparamagnetic microparticles have enabled much new research based on MRI tracking of magnetically labeled cells, signal-to-noise levels still limit the potential range of applications. Here it is shown how, through top-down

Design Considerations for Proteomic Reference Materials

August 25, 2010
Author(s)
David M. Bunk
In order to improve the repeatability, comparability, and accuracy of proteomic measurements, there has been considerable international effort to develop appropriate reference materials. While the majority of reference materials are developed to support

Measurement Needs in Sustainability and Materials Performance

August 24, 2010
Author(s)
Richard E. Ricker
Sustainability is an attractive approach to environmental stewardship because it recognizes the importance of continued profitability in maintaining the environment and advancing society. However, the ability of this approach to actually provide benefit

Temperature dependence of the diffusive conductivity of bilayer graphene

August 24, 2010
Author(s)
Shaffique Adam, Mark D. Stiles
Assuming diffusive carrier transport and employing an effective medium theory, we calculate the temperature dependence of bilayer graphene conductivity due to Fermi-surface broadening as a function of carrier density. We find that the temperature

Practical Near-Collisions for Reduced Round Blake, Fugue, Hamsi and JH

August 23, 2010
Author(s)
Meltem Sonmez Turan, Erdener Uyan
A hash function is near-collision resistant, if it is hard to find two messages with hash values that differ in only small number of bits. In this study, we used hill climbing methods to find near-collisions for some of the second round SHA-3 candidates
Displaying 26326 - 26350 of 73929
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