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Displaying 26526 - 26550 of 73697

Nanoparticle size and shape evaluation using the TSOM optical microscopy method

June 6, 2010
Author(s)
Ravikiran Attota, Richard J. Kasica, Lei Chen, Premsagar P. Kavuri, Richard M. Silver, Andras Vladar
We present a novel optical TSOM (through-focus scanning optical microscopy - pronounced as 'tee-som') method that produces nanoscale dimensional measurement sensitivity using a conventional optical microscope. The TSOM method uses optical information from

A Multicomponent and Multiphase Model of Reactive Wetting

June 4, 2010
Author(s)
Walter Villanueva, William J. Boettinger, Geoffrey B. McFadden, James A. Warren
A diffuse-interface model of reactive wetting with intermetallic formation is presented. The model incorporates fluid flow, solute diffusion, and phase change that are based on the total molar Gibbs energy of a ternary system with four phases. Numerical

Document Image Collection Using Amazon s Mechanical Turk

June 4, 2010
Author(s)
Audrey N. Tong, Mark A. Przybocki
We present findings from a collaborative effort aimed at testing the feasibility of using Amazon s Mechanical Turk as a data collection platform to build a corpus of document images. Experimental design and implementation workflow are described

Ultraviolet Weathering of Firefighter Protective Clothing

June 4, 2010
Author(s)
Rick D. Davis, Joannie W. Chin, Chiao-Chi Lin, Sylvain H. Petit
Exposure to simulated ultraviolet sunlight at 50 C and 50 % relative humidity caused a significant deterioration in the mechanical performance of polyaramid and polyaramid/polybenzimidazole based Outer Shell fabrics used in firefighter jacket and pants

Enhanced telecom wavelength single-photon detection with NbTiN superconducting nanowires on oxidized silicon

June 3, 2010
Author(s)
Michael G. Tanner, C. M. Natarajan, V. K. Pottapenjara, J. A. O?Connor, R. J. Warburton, Robert Hadfield, Burm Baek, Sae Woo Nam, S. Dorenbos, T. Zijlstra, Teun Klapwijk, Val Zwiller
Superconducting nanowire single-photon detectors (SNSPDs) have emerged as a highly promising infrared single-photon detector technology. Next-generation devices are being developed with enhanced detection efficiency (DE) at key technological wavelengths

Degradation and Nanoparticle Release of Nanocomposite Coatings Exposed to UV Radiation

June 2, 2010
Author(s)
Tinh Nguyen, Bastien T. Pellegrin, Coralie Bernard, Xiaohong Gu, Justin M. Gorham, Paul E. Stutzman, Alexander J. Shapiro, Walter E. Byrd, Joannie W. Chin
The release of nanoparticles from nanocomposite coatings during their life cycle potentially has negative effects to the environments and presents a roadblock to their uses. The degradation and nanoparticle release of amine-cured epoxy coatings containing

High Spectral purity oscillator at 40 GHz: Design using air-dielectric Cavity

June 2, 2010
Author(s)
Archita Hati, Craig W. Nelson, Billy F. Riddle, David A. Howe
We describe the design of a low-PM noise 40 GHz oscillator that uses a conventional air-dielectric cavity resonator as a frequency discriminator to clean up the PM noise of a commercial 10 GHz dielectric resonator oscillator (DRO) multiplied by four. The

Low-Frequency Characterization of MEMS-Based Portable Atomic Magnetometer

June 2, 2010
Author(s)
Rahul R. Mhaskar, Svenja A. Knappe, John E. Kitching
Atomic magnetometers based on absorption or polarization rotation of light in an alkali vapor have recently demonstrated sensitivities rivaling those of superconducting quantum interference devices (SQUIDs). Miniaturization of such devices containing vapor

Medium-Term Frequency Stability of Hydrogen Masers as Measured by a Cesium Fountain

June 2, 2010
Author(s)
Thomas E. Parker, Steven R. Jefferts, Thomas P. Heavner
Abstract Hydrogen masers are used extensively in time scale ensembles, but the frequency drift must be accurately known. NIST-F1, the cesium fountain primary frequency standard at the National Institute of Standards and Technology, now operates nearly

Monte-Carlo Reaction Rate Evaluation for Astrophysics

June 2, 2010
Author(s)
Ryan P. Fitzgerald, A. Coc, R Longland, A E. Champagne
We present a new evaluation of thermonuclear reaction rates for astrophysics involving proton and a-particle induced reactions, in the target mass range between A=14 and 40, including many radioactive targets. A method based on Monte Carlo techniques is

Phase Noise in the Photodetection of Ultrashort Optcial Pulses

June 2, 2010
Author(s)
Jennifer A. Taylor, Franklyn J. Quinlan, Archita Hati, Craig W. Nelson, Scott A. Diddams, Shubahshish Datta, Abhay Joshi
Femtosecond laser frequency combs provide an effective and efficient way to take an ultra-stable optical frequency reference and divide the signal down into the microwave region. In order to convert optical pulses into a usable rf signal, one must use high

Phase noise suppression in frequency comb generators

June 2, 2010
Author(s)
Craig W. Nelson, Archita Hati, J F. Nava-garcia, David A. Howe
We propose an idea to suppress the flicker (1/f) noise in radio frequency (RF) multiplier based frequency comb generators. Comb generators are often used for frequency multiplication in frequency synthesis. In general, comb generators apply high power to a

Towards a compact cold atom frequency standard based on coherent populatoin trapping

June 2, 2010
Author(s)
Francois-Xavier R. Esnault, Elizabeth Donley, John Kitching
We describe in this paper the main features of a cold atom CPT based frequency standard. We explain our particular CPT configuration and our experimental setup. as well as present simulations of the expected performance (stability and major systematics)

A Framework for XML Schema Naming and Design Rules Development Tools

June 1, 2010
Author(s)
Katherine C. Morris
Many organizations are facing enormous challenges today in trying to integrate a wide range of software systems. These systems span the functional areas within an organization, as well as, the multitude of organizations and countries involved in a business

A rapid, low-cost preparation of monodisperse niosomes in a microfluidic platform

June 1, 2010
Author(s)
Catherine T. Lo, Andreas Jahn, Wyatt N. Vreeland, Laurie E. Locascio
Niosomes are synthetic membrane vesicles made of self-assembled non-ionic surfactants (i.e. amphiphilic organic compounds). They bear the same properties as liposomes, namely having an aqueous interior that is separated from the exterior aqueous

Adding Attributes to Role Based Access Control

June 1, 2010
Author(s)
David R. Kuhn, Edward Coyne, Timothy Weil
Role based access control (RBAC) is a popular model for information security. It helps reduce the complexity of security administration and supports the review of permissions assigned to users, a feature critical to organizations that must determine their
Displaying 26526 - 26550 of 73697
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