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Displaying 36851 - 36875 of 74045

Laser Cooling of Erbium Atoms

May 21, 2005
Author(s)
Jabez J. McClelland, H Y. Ban, Marcus Jacka, James L. Hanssen, Joseph Reader
We have identified five closed, or nearly-closed, J ? J + 1 transitions in atomic erbium at wavelengths of 401 nm, 583 nm, 631 nm, 841 nm, and 1299 nm. These transitions can be reached by common tunable single-frequency laser systems, and are thus in

Direct Measurement of the Counterion Distribution Within Swollen Polyelectrolyte Films

May 20, 2005
Author(s)
Vivek M. Prabhu, B D. Vogt, Wen-Li Wu, Jack F. Douglas, Eric K. Lin, Sushil K. Satija, D M. Goldfarb, H Ito
A depth profile of the counterion concentration within thin polyelectrolyte films was measured in-situ using contrast variant specular neutron reflectivity to characterize the initial swelling stage of the film dissolution. We find a substantial counterion

HiCASS Target Tracking Sensor Study

May 20, 2005
Author(s)
Richard J. Norcross
The High Capacity Alongside Sea base Sustainment (HiCASS) program intends to generate substantial improvements in skin-to-skin at-sea replenishment. HiCASS requires real-time tracking and dynamic load position sensing.

Holographic microantenna array metrology

May 19, 2005
Author(s)
Erich N. Grossman, Arttu Luukanen, Aaron J. Miller
We describe a holographic or "phaseless" technique for measurement of complex antenna patterns that is particularly suited to planar antennas at very high frequencies -mm-wave thru long-wave infrared -where phase coherent detection is impractical. It has

Software Interoperability: Enabling New Technologies

May 19, 2005
Author(s)
John V. Messina, Matthew L. Aronoff, Eric D. Simmon
New and potentially disruptive technologies are constantly being introduced into the electronic interconnection industry as companies seek to improve their manufacturing chain and stay competitive. These new technologies do not exist in a vacuum and must

ThermoData Engine (TDE): Software Implementation of the Dynamic Data Evaluation Concept

May 18, 2005
Author(s)
Michael D. Frenkel, Robert D. Chirico, Vladimir Diky, Xinjian Yan, Qian Dong, Chris D. Muzny
The first full-scale software implementation of the dynamic data evaluation concept {ThermoData Engine (TDE)} is described for thermophysical and thermochemical property data. This concept requires the development of large electronic databases capable of

Low-frequency noise measurements on commercial magnetoresistive magnetic field sensors

May 17, 2005
Author(s)
Nathan Stutzke, Stephen E. Russek, David P. Pappas, Mark Tondra
Low frequency noise was measured in the frequency range from 0.1 Hz to 10 kHz on a variety of commercially available magnetic sensors. The types of sensors investigated include anisotropic magnetoresistance (AMR), giant magnetoresistance (GMR), and tunnel

Advantages of superconducting quantum interference device-detected magnetic resonance over conventional high-frequency electron paramagnetic resonance for characterization of nanomagnetic materials

May 16, 2005
Author(s)
Brant Cage, Stephen E. Russek, David Zipse, Naresh S. Dalal
A dc-detected high-frequency electron paramagnetic resonance (HF-EPR) technique, based on a standard superconducting quantum interference device (SQUID) magnetometer, has significant advantages over traditional HF-EPR based on microwave absorption

Machining Cracks in Finished Ceramics

May 16, 2005
Author(s)
George D. Quinn, L K. Ives, S Jahanmir
Well prepared strength test specimens and components break from a material s inherent flaws and machining damage has no effect on strength. On the other hand, grinding can create machining flaws that control strength and limit the performance of finished

Third Japan-US Workshop on Combinatorial Material Science and Technology

May 16, 2005
Author(s)
Winnie K. Wong-Ng
The Third Japan-US workshop on Combinatorial Material Science and Technology took place at the Loisir Hotel in Naha City on the historical island, Okinawa, Japan, from December 7 to December 10, 2004. This workshop was the third of a series of Japan-US

Current-induced switching in a single exchange-biased ferromagnetic layer

May 15, 2005
Author(s)
Tingyong Chen, Yi Ji, C Chien, Mark D. Stiles
We demonstrate current-induced switching effects in a single exchanged-biased ferromagnetic layer. A nanodomain can be switched within the ferromagnetic layer by a spin polarized current injected through a point contact. The high resistance of the

Magnetic normal modes of nano-elements

May 15, 2005
Author(s)
Robert McMichael, Mark D. Stiles
Micromagnetic calculations are used to determine the eigenfrequencies and precession patterns of some of the lowest-frequency magnetic normal modes of submicron patterned elements. For a Permalloy-like ellipse, 350 nm ¿ 160 nm ¿ 5 nm thick in zero field

A Flexible Bandpass Correction Method for Spectrometers

May 13, 2005
Author(s)
Yoshihiro Ohno
An improved method for the correction of bandpass errors in spectrometers has been developed. This method is an improvement over the Stearns and Stearns method, which is limited in use to a triangular bandpass function and requires the bandwidth be matched

Implementation of the semiclassical quantum Fourier transform in a scalable system

May 13, 2005
Author(s)
J Chiaverini, Joseph W. Britton, Dietrich G. Leibfried, Emanuel H. Knill, Murray D. Barrett, Brad R. Blakestad, Wayne M. Itano, John D. Jost, C. Langer, R Ozeri, Tobias Schaetz, David J. Wineland
One of the most interesting future applications of quantum computers is Shor's factoring algorithm, which provides an exponential speedup compared to known classical algorithms. The crucial final step in Shor's algorithm is the quantum Fourier transform

NIST Facility for Color Rendering Simulation

May 13, 2005
Author(s)
Wendy L. Davis, J L. Gardner, Yoshihiro Ohno
The color rendering index (CRI) does not adequately assess the color rendering properties of solid-state light sources. An improved metric will be critical to the development of such new light sources for general lighting applications. A facility for color
Displaying 36851 - 36875 of 74045
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