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Displaying 35951 - 35975 of 74347

Tailored Nanoscale Contrast Agents for Magnetic Resonance Imaging

December 30, 2005
Author(s)
Alexander J. Barker, Brant Cage, Stephen E. Russek, Ruchira Garg, R Shandas, Conrad Stoldt
Two potential molecular imaging vectors are investigated for material properties and magnetic resonance imaging (MRI) contrast improvement. Monodisperse magnetite (Fe 3O 4) nanocrystals ranging in size from 7 to 22 nm are solvothermally synthesized by

Reliability and Performance Limitations in SiC Power Devices

December 27, 2005
Author(s)
Ranbir Singh, Allen R. Hefner Jr.
Despite Silicon Carbide's (SiC's) high breakdown electric field, high thermal conductivity and wide bandgap, it faces certain reliability challenges when used to make conventional power device structures like power MOS-based devices, bipolar-mode diodes

Response Dynamics of the Frequency Comb Output from a Femtosecond Fiber Laser

December 26, 2005
Author(s)
Brian Washburn, William C. Swann, Nathan R. Newbury
The frequency comb from a mode-locked fiber laser can be stabilized through feedback to the pump power. An understanding of the mechanisms and bandwidth governing this feedback is of practical importance for frequency comb design and of basic interest

Single photon source characterization with a superconducting single photon detector

December 26, 2005
Author(s)
Robert Hadfield, Martin Stevens, Stephen Gruber, Aaron J. Miller, Robert E. Schwall, Richard Mirin, Sae Woo Nam
Superconducting single photon detectors (SSPD) based on nanopatterned niobium nitride wires offer single photon counting at fast rates, low jitter, and low dark counts, from visible wavelengths well into the infrared. We demonstrate the first use of an

Dependence of magnetization dynamics on magnetostriction in NiFe alloys

December 23, 2005
Author(s)
Roberto Bonin, Michael Schneider, Thomas J. Silva, John P. Nibarger
We present a quantitative, systematic study of the effect of magnetostriction on the dynamical properties in NiFe alloys. Both the ferromagnetic resonance frequency and the damping times are correlated to the magnetostriction. In addition, we find that the

Electromagnetic Signatures of WLAN Cards and Network Security

December 21, 2005
Author(s)
Catherine A. Remley, Chriss A. Grosvenor, Robert T. Johnk, David R. Novotny, Paul D. Hale, Michael McKinley, Emmanouil Antonakakis, A Karygiannis
The proliferation of wireless devices and the availability of new wireless applications and services raise new privacy and security concerns. Although network-layer anonymity protects the identities of the communication endpoints, the physical layer of

Intrinsic Electronic Conduction Mechanisms in Self-Assembled Monolayers

December 21, 2005
Author(s)
Wenyong Wang, Takhee Lee
A review on the mechanisms and characterization methods of molecu- lar electronic transport is presented. Using self-assembled monolayers (SAMs) of alkanethiols in a nanometer scale device structure, tunneling is unambiguously demonstrated as the main

The History of IDF and its Influences on IR and Other Fields

December 21, 2005
Author(s)
Donna K. Harman
The surprisingly simple IDF measure developed in 1972 by Karen Sparck Jones has continued to dominate the term weighting metrics used in information retrieval, despite several efforts to develop more complex measures of term distribution. It has been

Strain Relaxation in Patterned Strained Silicon Directly on Insulator Structures

December 19, 2005
Author(s)
R Z. Lei, W Tsai, I Aberg, T B. O'Reilly, J L. Hoyt, D A. Antoniadis, H I. Smith, Albert J. Paul, Martin L. Green, J Li, R Hull
Strain relaxation is studied in Strained Silicon Directly on Insulator (SSDOI) substrates patterned with nano-scale features. Using interference lithography, biaxially-strained SSDOI substrates with 30 nm-thick strained Si on insulator films were patterned

The Role of Semantic Roles in Disambiguating Verb Senses

December 19, 2005
Author(s)
Hoa T. Dang, Martha S. Palmer
We describe an automatic Word Sense Disambiguation (WSD) system that disambiguates verb senses using syntactic and semantic features that encode information about predicate arguments and semantic classes. Our system performs better than the best published

Construction Object Identification from LADAR Scans: An Experimental Study Using I-Beams

December 15, 2005
Author(s)
David E. Gilsinn, Geraldine S. Cheok, Christoph J. Witzgall, Alan M. Lytle
Laser Scanning devices (LADAR for Laser Detection and Ranging) are used in construction projects to capture as-built data. They can rapidly generate large unstructured point clouds. This study describes an experiment in which an I-beam on a concrete floor

Efficient generation of correlated photon pairs in a microstructure fiber

December 15, 2005
Author(s)
Jingyun Fan, Alan L. Migdall, L Wang
We report efficient generation of correlated photon pairs through degenerate four-wave mixing in a microstructure fiber. With 735.7 nm pump pulses producing correlated signal (688.5 nm) and idler (789.8 nm) photons in a 1.8 m microstructure fiber, we

Efficient Generation of Correlated Photon Pairs in a Microstructure Fiber

December 15, 2005
Author(s)
Jingyun Fan, Alan L. Migdall, L Wang
We report efficient generation of correlated photon pairs through degenerate four-wave mixing in microstructure fibers. With 735.7 nm pump pulses producing conjugate signal (688.5 nm) and idler (789.8 nm) photons in an 1.8 m microstructure fiber, we detect

Spin Transport for Spin Diffusion Lengths Comparable to Mean Free Paths

December 15, 2005
Author(s)
David R. Penn, Mark Stiles
In perpendicular-transport structures with magnetic and non-magnetic layers, there is a resistance associated with changes in the value of current polarization throughout the structure. Starting from a Boltzmann equation Valet and Fert derived macroscopic

The History of Instrumented Impact Testing

December 15, 2005
Author(s)
M. P. Manahan, Thomas A. Siewert
Pendulum impact testing is widely known to have a history that extends back to the turn of the last century. To many researchers today, instrumentation of the impact test to acquire a load-time history, and thereby provide important data in addition to

Self-Oscillating Rubidium Magnetometer using Nonlinear Magneto-Optical Rotation

December 14, 2005
Author(s)
P Schwindt, Leo W. Hollberg, John E. Kitching
The detection of nonlinear magneto-optical rotation (NMOR) of polarized light through alkali atomic vapor is a highly sensitive technique for measuring magnetic fields. We demonstrate that when using frequency modulated light to excite the NMOR resonance
Displaying 35951 - 35975 of 74347
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