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Search Publications

NIST Authors in Bold

Displaying 31101 - 31125 of 73697

Structure and Dynamics in Multicomponent Polyelectrolyte Solutions

March 11, 2008
Author(s)
Sanghun Lee, Vijay Tirumala, Michihiro Nagao, Taiki Tominaga, Eric K. Lin, Jian P. Gong, Wen-Li Wu
Double-network hydrogels (DN-gels) prepared from the combination of a moderately crosslinked anionic polyelectrolyte (poly(2-acrylamido-2-methyl-1-propanesulfonic acid, PAMPS) and an uncrosslinked linear polymer (polyacrylamide, PAAm) solution show strong

The Effect of Interfacial Roughness on the Thin Film Morphology and Charge Transport of High-Performance Polythiophenes

March 11, 2008
Author(s)
Y S. Jung, Regis J. Kline, Daniel A. Fischer, Eric K. Lin, Martin Heeney, Iain McCulloch, Dean DeLongchamp
We control and vary the roughness of a dielectric upon which a high-performance polymer semiconductor, poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (pBTTT) is cast, to determine the effects of roughness on thin-film microstructure and the

Thermodynamic Interactions in Double-Network Hydrogels

March 11, 2008
Author(s)
Taiki Tominaga, Vijay Tirumala, Sanghun Lee, Eric K. Lin, Jian P. Gong, Wen-Li Wu
Double-network hydrogels (DN-gels) prepared from the combination of a moderately crosslinked anionic polyelectrolyte and an uncrosslinked linear polymer solution exhibit mechanical properties such as fracture toughness that are intriguingly superior to

Diffraction and Electron Energy Loss to Plasmons in Silicon Slabs

March 10, 2008
Author(s)
Zachary H. Levine
Dynamic diffraction patterns have been calculated for 25-nm thick slabs of silicon with [001], [111], and [110] faces for a 120 keV electron beam. The calculation used the mixed dynamical form factor in the dielectric formulation. Dielectric matrices with

Contact-induced crystallinity for high-performance soluble acene-based transistors and circuits

March 8, 2008
Author(s)
David J. Gundlach, James E. Royer, SK Park, Sankar Subramanian, Oana Jurchescu, Behrang H. Hamadani, Andrew Moad, Regis J. Kline, LC Teague, Oleg A. Kirillov, Curt A. Richter, Lee J. Richter, Sean R. Parkin, Thomas Jackson, JE Anthony
The use of organic materials presents a tremendous opportunity to significantly impact the functionality and pervasiveness of large-area electronics. Commercialization of this technology requires reduction in manufacturing costs by exploiting inexpensive

Dependence of noise in magnetic tunnel junction sensors on annealing field and temperature

March 7, 2008
Author(s)
Stephen E. Russek, David P. Pappas, Sean Halloran, Lu Yuan, Sy-Hwang Liou, Rui Zhang
The minimum detectable field of magnetoresistive sensors is limited by their intrinsic noise. Magnetization fluctuations are one of the crucial noise sources and are related to the magnetization alignment at the antiferromagnetic – ferromagnetic interface

Guidelines on Active Content and Mobile Code

March 7, 2008
Author(s)
Wayne Jansen, Theodore Winograd, Karen A. Scarfone
Active content technologies allow code, in the form of a script, macro, or other kind of portable instruction representation, to execute when the document is rendered. Like any technology, active content can be used to deliver essential services, but it

Frequency ratio of Al + and Hg + single-ion optical clocks; metrology at the 17th decimal place

March 6, 2008
Author(s)
Till P. Rosenband, David Hume, P. O. Schmidt, Chin-Wen Chou, Anders Brusch, Luca Lorini, Windell Oskay, Robert E. Drullinger, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Nathan R. Newbury, W Swann, Wayne M. Itano, David J. Wineland, James C. Bergquist
We report the frequency ratio of the two most accurate and stable atomic clocks with a total fractional uncertainty of 5.2 X 10 -17 . This frequency ratio is the best-known physical constant that is not a simple integer. Repeated measurements during the

Internal Photoemission Spectroscopy of [TaN/TaSiN] and [TaN/TaCN] Metal Stacks On SiO2 and [HfO2 / SiO2] Dielectric Stack.

March 6, 2008
Author(s)
Nhan V. Nguyen, Hao Xiong, John S. Suehle, Oleg A. Kirillov, Eric Vogel, Prashant Majhi, Huang-Chun Wen
Metal gates have been intensively searched to replace the poly-silicon for the next generation metal-oxide-semiconductor field-effect transistor. The barrier height (??0) at their interfaces with a gate dielectric must be known to select a suitable metal

Analysis of Thermodynamic Processes Involving Hydrogen

March 5, 2008
Author(s)
Jiann C. Yang, Marcia L. Huber
The effect of thermal exposures on several thermodynamic processes involving the storage and use of hydrogen has been examined using the NIST REFPROP database. The thermal environment could be the result of a fire or other thermal events. The thermodynamic

Vibrational modes of nanolines

March 5, 2008
Author(s)
Paul R. Heyliger, Colm Flannery, Ward L. Johnson
Brillouin-light-scattering spectra previously have been shown to provide information on acoustic modes of polymeric lines fabricated by nanoimprint lithography. Finite-element methods for modeling such modes are presented here. These methods provide a

Micro Effects for Single Phase Pressure Drop In Microchannels

March 3, 2008
Author(s)
Dong H. Han, Mark A. Kedzierski
This paper investigates the significance of several micro-effects that have been proposed to influence pressure drop measurements in microchannels. Pressure drop measurements were made for liquid flow within tubular microchannels nominally ranging in

Performance Analysis of 10 kV, 100 A SiC Half-Bridge Power Modules

March 3, 2008
Author(s)
Allen R. Hefner Jr.
Abstract: The DARPA Wide Bandgap Semiconductor Technology (WBGS) High Power Electronics (HPE) Phase II program is developing high-voltage, high-frequency SiC device and package technology needed to meet the specific program objectives for a 13.8 kV, 2.75

Two-Body Transients in Coupled Atomic-Molecular BECs

March 3, 2008
Author(s)
Pascal Naidon, Eite Tiesinga, Paul S. Julienne
We discuss the dynamics of an atomic Bose-Einstein condensate when pairs of atoms are converted into molecules by single-color photoassociation. Three main regimes are found and it is shown that they can be understood on the basis oftime-dependent two-body

Development of Infrared Scene Projectors for Fire Fighter Cameras

March 2, 2008
Author(s)
Joseph P. Rice, Jorge E. Neira, Francine K. Amon
We have developed two types of infrared scene projectors for hardware-in-the-loop testing of thermal imaging cameras such as those used by fire-fighters. In one, direct projection, images are projected directly into the camera. In the other, indirect
Displaying 31101 - 31125 of 73697
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