U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 31301 - 31325 of 73929

Imaging with modular linear arrays of cryogenic Nb microbolometers

March 17, 2008
Author(s)
Erich N. Grossman, Charles Dietlein, Jon E. Bjarnason, Mabel Ramirez, M. Leivo, J. A. Penttila, P. Helisto, A. Luukanen
We present ultrawideband imagery obtained with modular, 8-element, superconducting Nb microbolometer arrays. Conically scanned images are presented and compared with raster-scanned images obtained on the same arrays and from similar NbN arrays at VTT

On Test Collections for Adaptive Information Retrieval

March 17, 2008
Author(s)
Ellen M. Voorhees
Traditional Cranfield test collections represent an abstraction of a retrieval task that Sparck Jones calls the core competency of retrieval: a task that is necessary, but not sufficient, for user retrieval tasks. The abstraction facilitates research by

CALCULATED REGENERATOR PERFORMANCE AT 4 K WITH HELIUM-4 AND HELIUM-3

March 16, 2008
Author(s)
Ray Radebaugh, Yonghua Huang, Agnes O?Gallagher, John Gary
The helium-4 working fluid in regenerative cryocoolers operating with the cold end near 4 K deviates considerably from an ideal gas. As a result, losses in the regenerator, given by the time-averaged enthalpy flux, are increased and are strong functions of

Measurement Issues in Single-Wall Carbon Nanotubes

March 15, 2008
Author(s)
S Arepalli, Stephen W. Freiman, Stephanie A. Hooker, Kalman D. Migler
Recommended Practice Guide for Single Wall Carbon Nanotube Characterization consisting of five chapters: Introduction; Thermogravimetric Analysis (TGA) ; Near-IR Spectroscopy (NIR), Raman Spectroscopy, Optical, Electron, and Scanned Probe Microscopy.

Liposome-Templated Supramolecular Assembly of Responsive Alginate Nanogels

March 14, 2008
Author(s)
Jennifer S. Hong, Wyatt N. Vreeland, Silvia H. De Paoli Lacerda, Laurie E. Locascio, Michael Gaitan, Srinivasa R. Raghavan
Nanosized gel particles (nanogels) are of interest for a variety of applications, including controlled release of drugs and single-molecule encapsulation. Here, we employ the cores of nanoscale liposomes as reaction vessels to template the assembly of

Optical Lattice Induced Light Shifts in a Yb Atomic Clock

March 14, 2008
Author(s)
Zeb Barber, Jason Stalnaker, Nathan D. Lemke, Christopher W. Oates, Tara M. Fortier, Scott A. Diddams, Leo W. Hollberg, C Hoyt
We present an experimental study of the lattice induced light shifts on the $^1S_0\rightarrow\,^3P_0$ clock transition of ytterbium. The ``magic'' frequency for the $^{174}$Yb isotope was determined to be $u_{magic} = 394\,799\,475(35)$MHz. The

Quantitative Measurement of Outgas Products From EUV Photoresists

March 14, 2008
Author(s)
Charles S. Tarrio, Bruce A. Benner Jr, Robert E. Vest, Steven E. Grantham, Shannon B. Hill, Thomas B. Lucatorto, Jay H. Hendricks, Patrick J. Abbott, Greg Denbeaux, Alin Antohe, Chimaobi Mbanaso, Kevin Orbek
The photon-stimulated emission of organic molecules from the photoresist during exposure is a serious problem for extreme- ultraviolet lithography (EUVL) because the adsorption of the outgassing products on the EUV optics can lead to carbonization and

Spin Transfer Precessional Dynamics in Co 60 Fe 20 B 20 Nanocontacts

March 14, 2008
Author(s)
William H. Rippard, Matthew R. Pufall, Michael L. Schneider, Kevin Garello, Stephen E. Russek
We report on the precessional dynamics in spin transfer oscillators having Co 60Fe 20B 20 free layers as a function of annealing time at 225 °C. Repeated annealing reduces the critical current I c by roughly a factor of 3 and increases the tunability of

ADHESION TEST METHOD FOR SPRAYED APPLIED FIRE RESISTANT MATERIALS

March 12, 2008
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston
Fire resistive materials are exceptional at providing an effective thermal barrier to structural steel from the heat flux from a fire, provided it is in close proximity to the steel during the fire event. The adhesion of the fire resistive materials is

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
Displaying 31301 - 31325 of 73929
Was this page helpful?