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NIST Authors in Bold

Displaying 49526 - 49550 of 143780

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

Blog Track Research at TREC

June 1, 2010
Author(s)
Ian M. Soboroff, Craig Macdonald, Rodrygo Santos, Iadh Ounis
The TREC Blog track aims to explore information seeking behaviour in the blogosphere, by building reusable test collections for blog-related search tasks. Since, its advent in TREC 2006, the Blog track has led to much research in this growing field, and
Displaying 49526 - 49550 of 143780
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