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 37376 - 37400 of 74378

Investigations of Noise in Measurements of Electronic Voltage Standards

April 1, 2005
Author(s)
Thomas J. Witt, Yi-hua D. Tang
We have investigated noise in measurements of the 10 V outputs of electronic voltage standards based on Zener diode references (Zeners). Zener outputs were compared to NIST Josephson standards using a digital voltmeter (DVM) to measure voltage differences

Lateral Deformation of Diffusion Couples

April 1, 2005
Author(s)
William J. Boettinger, Geoffrey B. McFadden, Sam R. Coriell, R F. Sekerka, James A. Warren
A model is proposed to describe the shape change (displacement field) of a binary diffusion couple when the intrinsic (lattice) diffusivities of the two substitutional atomic species differ. As for the Kirkendall effect, the displacement is due the

Linearization of Large-Signal Scattering Functions

April 1, 2005
Author(s)
Jan Verspecht, Dylan Williams, Dominique Schreurs, Kate Remley, Michael McKinley
We present an improved smallsignal linearization of large-signal scatteringparameter functions that takes on a convenient form similar to scattering parameters. We develop rules for the evolution of the linearization and large-signal scattering functions

Liquid-state NMR Simulations of Quantum Many-body Problems

April 1, 2005
Author(s)
C. Negrevergne, Rolando Somma, Gerardo Ortiz, Emanuel Knill, R. Laflamme
The n-qubit concurrence canonical decomposition (CCD) is a generalization of the two-qubit canonical decomposition SU(4)=[SU(2) (x) SU(2)] ? [SU(2) (x) SU(2)], where ? is the commutative group which phases the maximally entangled Bell basis. A prequel

Magnetic Method to Characterize the Current Densities in a Breaker Arc

April 1, 2005
Author(s)
Nadia Machkour-Deshayes
The purpose of this research was to use magnetic induction measurements from a low voltage electric arc, to reconstruct the arc''s current density. The measurements were made using Hall effect sensors, which were placed close to, but outside the breaking

Manipulating Cell Adhesion on Gradient Poly(2-Hydroxyethyl Methacrylate)-Grafted Surfaces

April 1, 2005
Author(s)
Ying Mei, Tao Wu, Chang Xu, K J. Langenbach, John T. Elliott, B D. Vogt, Kathryn L. Beers, Eric J. Amis, N Washburn
In this study, a simple and versatile method was developed to prepare the low grafting density initaitor gradient, which was combined with surface initiated atom transfer radical polymerizations (ATRP) to produce a well defined poly(2-hydroxyethyl

Mechanisms of Osteoblast Adhesion on 3D Polymer Scaffolds Made by Rapid Prototyping

April 1, 2005
Author(s)
T DuttaRoy, Francis W. Wang, J J. Stone, E H. Cho, S J. Lockett
In this study, we looked at the adhesion of osteoblasts on 3D polycaprolactone (PCL) scaffolds compared to 2D PCL films and glass coverlsips. This adhesion was quantified after 24 hours by staining for vinculin, a marker of cell-substrate adhesion, and

Microfluidic Platform for the Generation of Organic-Phase Microreactors

April 1, 2005
Author(s)
Zuzanna T. Cygan, J Cabral, Kathryn L. Beers, Eric J. Amis
Rapid prototyping photolithography of a thiolene based resin was used to fabricate microfluidic devices stable to aliphatic and aromatic organic solvents. The swelling of the thiolene resin in various organic solvents was quantified and the solvent

Nanopore Formation in a Polyphenylene Low-k Dielectric

April 1, 2005
Author(s)
M S. Silverstein, Michael Shach-Caplan, Barry J. Bauer, R C. Hedden, V. J. Lee, B G. Landes
Nanometer-scale porosity is being introduced into low-k dielectrics in an attempt to achieve interlevel metal insulators with permittivities of less than 2.0. It has proven extremely difficult to describe pore formation and to characterize the porous

Optical Flatness Metrology for 300 mm Silicon Wafers

April 1, 2005
Author(s)
Ulf Griesmann, Quandou (. Wang, T D. Raymond
At the National Institute of Standards and Technology (NIST), we are developing two interferometric methods for measuring the thickness variation and flatness of free-standing and chucked silicon wafers with diameters up to 300mm. The eXtremely accurate

Performance Analysis of Exponential Backoff

April 1, 2005
Author(s)
B J. Kwak, N O. Song, Leonard E. Miller
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

Precision Measurements of AC Josephson Voltage Standard Operating Margins

April 1, 2005
Author(s)
Charles J. Burroughs, Samuel P. Benz, Paul D. Dresselhaus, Yonuk Chong
Recent advances in circuit design and fabrication of superconducting integrated circuits have enabled us to demonstrate an ac Josephson voltage standard (ACJVS) that generates both ac and dc waveforms up to 242mV peak voltage. Using a Fast Fourier

Progress on Johnson Noise Thermometry using a Quantum Voltage Noise Source for Calibration

April 1, 2005
Author(s)
Sae Woo Nam, Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs, Weston L. Tew, D. R. White, John M. Martinis
We describe our progress towards a high-precision measurement of temperature using Johnson noise. Using a Quantized Voltage Noise Source (QVNS) based on the Josephson effect as a calculable noise source, we have been able to measure the ratio of the

Project MESA Technical Specification Group document MESA_70.012_v1.2.1.doc

April 1, 2005
Author(s)
L T. Klein-berndt, Nader Moayeri
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled
Displaying 37376 - 37400 of 74378
Was this page helpful?