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Displaying 36826 - 36850 of 74165

Noise-free high-efficiency photon-number-resolving detectors

June 17, 2005
Author(s)
Danna Rosenberg, Adriana Lita, Aaron J. Miller, Sae Woo Nam
High-efficiency optical detectors that can determine the number of photons in a pulse of monochromatic light have applications in a variety of physics studies, including post-selection-based entanglement protocols for linear optics quantum computing and

On Peculiarities of S-Parameter Measurements

June 17, 2005
Author(s)
Yves Rolain, Wendy Van Moer, Jeffrey Jargon, Donald C. DeGroot
Measured S-parameters are a key factor for many measurement/modeling applications. Experience teaches that quantities that are derived from the measurements can contain spikes, and that they tend to grow with connection imperfections. In this paper, a

Phase Noise Effects in Sampling Microwave Measurement Systems

June 17, 2005
Author(s)
Giovanni Loglio, Jeffrey Jargon, Donald C. DeGroot, Zoya Popovic
For the purpose of bounding sources of measurement uncertainty, we examine the effects of phase noise on measured wave-variables using sampling, downconvertor-based measurement systems. Utilizing an analytical description, we show that if the phase of the

A Phasor Angle Definition Suitable for Intermodulation Measurements

June 16, 2005
Author(s)
Giovanni Loglio, Jeffrey Jargon, Donald C. DeGroot
We describe a method for preserving time-invariant phase determination of non-harmonically related signals. In particular, signals lying in complex intermodulation spectra are considered. We provide simple examples to illustrate our technique, and show how

Improved Radiation and Combustion Routines for a Large Eddy Simulation Fire Model

June 16, 2005
Author(s)
Kevin B. McGrattan, J E. Floyd, Glenn P. Forney, Howard R. Baum, Simo A. Hostikka
Improvements have been made to the combustion and radiation routines of a large eddy simulation fire model maintained by the National Institute of Standards and Technology. The combustion is based on a single transport equation for the mixture fraction

Parallel Synthesis and Dissolution Testing of Polyanhydride Random Copolymers

June 16, 2005
Author(s)
Brandon M. Vogel, Naomi Eidelman, Balaji Narasimhan, Surya Mallapragada
A linearly varying compositional library of 100 different polyanhydride randomcopolymers was designed, fabricated, and characterized within a few hours. A subset of this library was chosen and a substrate was designed and fabricated to enable the synthesis

Rapid Formation of Soft Hydrophilic Silicone Elastomer Surfaces

June 16, 2005
Author(s)
K Efimenko, J A. Crowe, E Manias, D W. Schwark, Daniel A. Fischer, Jan Genzer
We report on the rapid formation of hydrophilic silicone elastomer surfaces by ultraviolet/zone (UVO) irradiation of poly(vinylmethyl siloxane) (PVMS) network films. Our results reveal that the PVMS network surfaces render hydrophilic upon only a short UVO

Program: 2005 Boulder Laboratories Postdoctoral Poster Symposium

June 15, 2005
Author(s)
Joe W. Magee
The Boulder Laboratories Diversity Council has announced a networking opportunity - the 2005 Boulder Laboratories Postdoctoral Poster Symposium, for postdoctoral associates and student affiliates. The planned event is to begin with an informal gathering

Dilute Al-Mn Alloys for Superconductor Tunneling and Other Devices

June 13, 2005
Author(s)
Steve T. Ruggiero, G. B. Arnold, A Williams, Anna Clark, Nathan A. Tomlin, Joel Ullom
We present tunneling results for junctions comprising Mn doped Al films produced by sputter deposition, with Mn oncentrations in the range of 5000 ppm. Our results for SIS, IS, and NIS junctions demonstrate that Al-Mn alloys can serve as both

Femtosecond laser frequency combs: optical synthesizers for precision spectroscopy and frequency metrology

June 12, 2005
Author(s)
Scott A. Diddams, A Bartels, Tara M. Fortier, Eugene N. Ivanov, Kyoungsik Kim, John J. McFerran, Windell Oskay, G Wilpers, Christopher W. Oates, James C. Bergquist, Leo W. Hollberg, Vladislav Gerginov, C E. Tanner
A femtosecond laser frequency comb (FLFC) is the broadband (octave-spanning) evenly-spaced array of optical frequencies that is present in the output of a femtosecond mode-locked laser. Such frequency combs immediately found wide-spread use in optical

Wavelength References for Optical Interferometry

June 12, 2005
Author(s)
Richard W. Fox, Leo W. Hollberg
We are exploring air wavelength references useful for interferometry. Femtosecond comb frequency measurements determine mode wavelengths of a stable optical cavity in vacuum, and subsequently a tunable laser is locked to the modes in air.

A Novel Test Method for Measuring Mechanical Properties at the Small-Scale: The Theta Specimen

June 9, 2005
Author(s)
George D. Quinn, Lin-Sien H. Lum, Dan Xiang, Ajitkumar Jillavenkatesa, Li Ma, Douglas T. Smith
A test method has been developed for measuring mechanical properties of material structures at the small-scale. Round or hexagonal rings are compressed vertically on their ends thereby creating a uniform tension stress in a horizontal crossbar that serves

In-Cavity Calibration of High Heat-Flux Sensors: Experimental Validation

June 9, 2005
Author(s)
A V. Murthy, Gerald T. Fraser, D P. DeWitt
This paper deals with the feasibility of performing primary calibration of heat-flux sensors at high irradiance levels by placing inside the cylindrical cavity of a graphite-tube blackbody. The experimental study comprised of measurements on two Schmidt

Details of the Sequential Steps in Magnetocaloric Regeneration

June 8, 2005
Author(s)
F Shir, Lawrence H. Bennett, Edward Della Torre, C Mavriplis, L Yanik, Robert D. Shull
We report on the first demonstration of the four sequential steps in magnetocaloric regeneration of a magnetocaloric material: magnetization, warm blow, demagnetization, and cold blow. The experimental results display temperature divergence due to

Microfabricated atomic frequency references

June 7, 2005
Author(s)
John E. Kitching, Svenja A. Knappe, Li-Anne Liew, John Moreland, P Schwindt, V Shah, Vladislav Gerginov, Leo W. Hollberg
Using microfabrication processes, we have been able to construct physics packages for vapour cell atomic frequency references 100¿ smaller than previously existing versions, with a corresponding reduction in power consumption. In addition, the devices
Displaying 36826 - 36850 of 74165
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