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Displaying 24176 - 24200 of 73985

High-resolution single-mode fiber-optic distributed Raman sensor for absolute temperature measurement using superconducting nanowire single-photon detectors

November 17, 2011
Author(s)
Michael G. Tanner, Shellee D. Dyer, Burm Baek, Robert Hadfield, Sae Woo Nam
We demonstrate a distributed fiber Raman sensor for absolute temperature measurement with spatial resolution on the order of 1 cm at 1550 nm wavelength in single mode fiber using superconducting nanowire single photon detectors. Rapid measurements are

Minimizing damage during FIB-TEM sample preparation of soft materials

November 17, 2011
Author(s)
Nabil Bassim, Bradley De Gregorio, A. D. Kilcoyne, Keana Scott, Tsngming Chou, S. Wirick, George Cody, Rhonda Stroud
Although focused ion beam (FIB) microscopy has been used successfully for milling patterns and creating ultra-thin transmission electron microscopy (TEM) sections of polymers and other soft materials, little has been documented regarding FIB-induced damage

Self-Repairing Complex Helical Columns Generated via Kinetically Controlled Self-Assembly of Dendronized Perylene Bisimides

November 16, 2011
Author(s)
Virgil Percec, Steven Hudson, Mihai Peterca, Pawaret Leowanawat, Emad Aqad, Robert Graf, Hans -. Spiess, Xiangbing Zeng, Goran Ungar, Paul A. Heiney
The dendronized perylene 3,4:9,10-tetracarboxylic acid bisimide (PBI) (3,4,5)12G1-3-PBI was recently shown to self-assemble in a complex helical column containing tetramers of PBI as the basic repeat unit. The tetramers contain a pair of two molecules

XML Validation Website: A User's Guide

November 16, 2011
Author(s)
Julien C. Cuvillier, Katherine C. Morris
This report describes the XML Validation website which hosts a number of XML parsing tools that can be used to remotely validate XML schema files against the W3C XML Schema standard, and XML data files against their corresponding XML schemas. The first

From the Editor's Desk: Happy Trails

November 15, 2011
Author(s)
Catherine A. Remley
Abstract: This is an Editorial for the December, 2011 issue of IEEE Microwave Magazine. Kate Remley writes about items of interest to the Microwave Theory and Techniques Society (MTT-S).

Generation and characterization of high-purity, pulsed squeezed light at telecom wavelengths from pp-KTP

November 15, 2011
Author(s)
Thomas Gerrits, Martin J. Stevens, Burm Baek, Brice R. Calkins, Adriana E. Lita, Scott C. Glancy, Emanuel H. Knill, Sae Woo Nam, Richard P. Mirin, Robert Hadfield, Ryan Bennink, Warren Grice, Sander N. Dorenbos, Tony Zijlstra, Teun Klapwijk, Val Zwiller
We characterize a pp-KTP crystal designed to produce pure single mode squeezed vacuum at 1570 nm. Measurements show a raw (corrected) Hong-Ou-Mandel interference with 86 % (90 %) visibility and a circular joint spectral probability distribution with a

NON-CONTACT DIMENSIONAL MEASUREMENTS OF BIPOLAR FUEL CELL PLATES

November 15, 2011
Author(s)
Balasubramanian Muralikrishnan, Wei Ren, Dennis S. Everett, Eric S. Stanfield, Theodore D. Doiron
Non-contact dimensional measurement of fuel cell plates is critical to the eventual rapid manufacture by supporting in-process measurement and control. This need has been identified by the Department of Energy’s Hydrogen Program, and by numerous

Overview of the TREC 2011 Web Track

November 15, 2011
Author(s)
Ian M. Soboroff, Nick Craswell, Charles L. Clarke, Gordon Cormack
The TREC Web Track explores and evaluates Web retrieval technology over large collections of Web data. In its current incarnation, the Web Track has been active for two years. For TREC 2010, the track includes three tasks: 1) an adhoc retrieval task, 2) a

Selecting and Scaling Earthquake Ground Motions for Performing Response-History Analyses

November 15, 2011
Author(s)
Andrew Whittaker, Gail Atkinson, Jack Baker, Jonathan Bray, Damian Grant, Ronald Hamburger, Curt Haselton, Paul Somerville
The primary objective of this task was to develop guidance for selecting, generating, and scaling earthquake ground motions for effective use in performing response history analyses for use in performance-based seismic engineering. The need for such

The Development of an Aerodynamic Shoe Sampling System

November 15, 2011
Author(s)
Matthew E. Staymates, Jessica M. Grandner, John G. Gillen, Stefan Lukow
In collaboration with the Transportation Security Laboratory, the National Institute of Standards and Technology has been developing a prototype shoe sampling system that relies on aerodynamic sampling for liberating, transporting, and collecting explosive

Carbon Nanotube Nucleation Driven by Catalyst Morphology Dynamics

November 14, 2011
Author(s)
Elena Pigos, Evgeni S. Penev, Morgana A. Ribas, Renu Sharma, Boris I. Yakobson, Avetik R. Harutyunyan
In situ observation of carbon nanotube nucleation process accompanied by catalyst particle dynamic morphology reconstruction is considered within a thermodynamic approach, and reveals the driving force for the liftoff—a crucial event in the nanotube growth

Characterizing Dynamic Effects of Oscillator Power Cycling

November 14, 2011
Author(s)
David A. Howe, Danielle G. Lirette, Neil Ashby, Archita Hati, Craig W. Nelson
We create a measurement technique and metrics consistent with easy interpretation to be used in development of new oscillators specifically for applications in which the oscillator’s power is turned on and off. This is useful in predicting the performance

Fundamental Limits of Optical Patterned Defect Metrology

November 14, 2011
Author(s)
Richard M. Silver, Bryan Barnes, Martin Sohn, Hui Zhou, Jing Qin
The semiconductor manufacturing industry is now facing serious challenges in achieving defect detection rates with acceptable throughput and accuracy. With conventional bright-field and dark-field inspection methods now at their limits, it has become

Improvements to A Transportable Atomic Fountain Laser system

November 14, 2011
Author(s)
Paul D. Kunz, Vladislav Gerginov, Thomas P. Heavner, Steven R. Jefferts
We are developing a transportable rubidium (Rb) atomic fountain frequency standard which uses independently phase-locked diode lasers for laser-cooling. At this point in time, we have not demonstrated sub-Doppler (υKelvin) atom temperatures using out

Magneto-optical observation of four-wave scattering in a 15 nm Ni 81 Fe 19 film during large angle magnetization precession

November 14, 2011
Author(s)
Hans T. Nembach, Karen Livesey, Michael Kostylev, Patrica Martin-Pimentel, Sebastian Hermsdoerfer, Britta Leven, Juergen Fassbender, Burkard Hillebrands
Large angle magnetization precession induced by a short pulsed magnetic field in a 15 nm thick Ni 81Fe 19 film is observed using a time-resolved magneto-optical Kerr effect technique with sensitivity to all three components of the magnetization vector. A

Manipulating Particle Trajectories with Phase-control in Surface Acoustic Wave Microfluidics

November 14, 2011
Author(s)
Nathan D. Orloff, Jaclyn R. Dennis, Marco Cecchini, Ethan Schonbrun, Eduard Rocas, Yu Y. Wang, David R. Novotny, Raymond W. Simmonds, John M. Moreland, Ichiro Takeuchi, James C. Booth
We present a 91 MHz surface acoustic wave resonator with integrated microfluidics that includes a flow focus, an expansion region, and a binning region. We demonstrate the ability to change the position of the acoustic nodes by varying the electronics
Displaying 24176 - 24200 of 73985
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