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Search Publications

NIST Authors in Bold

Displaying 34476 - 34500 of 73697

High-Throughput Evaluation of Restorative Dental Polymers

March 31, 2006
Author(s)
Sheng Lin-Gibson, Forrest A. Landis, Nancy J. Lin
The effects of co-monomer composition and irradiation time on material properties and cell response were determined using high-throughput and combinatorial methods. 2-Dimensional gradient samples varying in monomer composition and light exposure time were

Integer Representation of Decimal Numbers for Exact Computations

March 31, 2006
Author(s)
Javier Bernal, Christoph J. Witzgall
A scheme is presented and software is documented for representing as integers input decimal numbers that have been stored in a computer as double precision floating point numbers and for carrying out multiplications, additions and subtractions based on

Parallelism for Quantum Computation with Qudits

March 31, 2006
Author(s)
Dianne M. O'Leary
Robust quantum computation with d-level quantum systems (qudits) poses two requirements: fast, parallel quantum gates and high fidelity two-qudit gates. We first describe how to implement parallel single qudit operations. It is by now well known that any

Projections Onto Order Simplexes and Isotonic Regression

March 31, 2006
Author(s)
Anthony J. Kearsley
We begin this expository essay by reviewing with examples what a typical engineer already knows about statistics. We then consider a central question in engineering decision making, i.e., given a computer simulation of high-consequence systems, how do we

Ag/AgCl Microelectrodes with Improved Stability for Microfluidics

March 30, 2006
Author(s)
Brian J. Polk, Anna Stelzenmuller, Geraldine I. Mijares, William A. MacCrehan, Michael Gaitan
A method for fabricating Ag/AgCl planar microelectrodes for microfluidic applications is presented. Microreference electrodes enable accurate measurements with miniaturized chemical sensors but such electrodes often exhibit very limited useable lifetimes

Experience in the Exchange of Procedural Shape Models Using ISO 10303 (STEP)

March 30, 2006
Author(s)
Mike Pratt, Junhwan Kim
The international standard ISO 10303 (STEP) is being extended to permit the exchange of procedurally defined shape models, with additional parameterization and constraint information, between CAD systems. The transfer of parameterized assembly models is an

Large-angle magnetization dynamics measured by time-resolved ferromagnetic resonance

March 30, 2006
Author(s)
Thomas Gerrits, Michael Schneider, Anthony B. Kos, Thomas J. Silva
A time-resolved ferromagnetic resonance technique was used to investigate the nonlinear magnetization dynamics of a 10 nm thin Permalloy TM film in response to a sequence of large-amplitude field pulses. The magnetic field pulse sequence was set at a

One-Laser Interferometric Broadband Coherent Anti-Stokes Raman Scattering

March 30, 2006
Author(s)
T W. Kee, Hongxia (Jessica) Zhao, Marcus T. Cicerone
We introduce an interferometric technique for eliminating the nonresonant background of broadband coherent anti-Stokes Raman scattering (CARS) microscopy. CARS microscopy has been used for imaging a number of biological samples and processes, but the

Ionizing Radiation-Induced Destruction of Benzene and Dienes in Aqueous Media

March 28, 2006
Author(s)
M I. Al-Sheikhly, Dianne L. Poster, Jung-Chul An, Pedatsur Neta, Joseph Silverman, Robert E. Huie
Pulse radiolysis with spectrophotometric and conductometric detection was utilized to study the formation and reactions of radicals from benzene and dienes in aqueous solutions. The benzene OH adduct, C6H6OH, reacts with O2 (k = 3 x 108 L mol-1 s-1) in a

A Compact High Stability Optical Clock Based on Laser-Cooled Ca

March 27, 2006
Author(s)
Christopher W. Oates, Yann LeCoq, G Wilpers, Leo W. Hollberg
We report new measurements and modifications for a simple, compact, Ca atomic clock at 657 nm. External measurements were made against an independent Yb lattice optical clock via a fs-laser frequency comb. These results lead to upper limits of the Ca clock

Atom-based stabilization for laser-pumped atomic clocks

March 27, 2006
Author(s)
Vladislav Gerginov, V Shah, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
Progress towards simplification and improvement of the long-term stability of chip-scale atomic clocks is presented. The conventional technique of laser optical frequency and cell temperature control is compared with a novel technique which avoids the use

Blackbody radiation shift of the 27 Al + 1 S 0 - 3 P 0 transition

March 27, 2006
Author(s)
Till P. Rosenband, Wayne M. Itano, Piet Schmidt, David Hume, Jeroen Koelemeij, James C. Bergquist, David J. Wineland
The differential polarizability, due to near-infrared light at 1126 nm, of the 27Al + 1S 0 – 3P 0 transition is measured to be {Δ}α = (1.6 ± x 10 -31 m 3, where {Δ}α = α P - α S is the difference between the excited and ground state polarizabilities. This

Dietary Supplement Standard Reference Materials

March 27, 2006
Author(s)
Lane C. Sander, Katherine E. Sharpless, Stephen A. Wise
A new category of Standard Reference Materials based on dietary supplements are under development by NIST, with certified values for organic constituents and selected trace elements. These materials are provided primarily for use in method development and

New Industry Requirements for Clock Synchronization and Time Stamping

March 27, 2006
Author(s)
Harvey Wohlwend, Ya-Shian Li-Baboud
This presentation will report on the results of an industry working group studying time synchronization. The working group will present new industry requirements as well as guidelines for improving time synchronization and time stamping. Efficient

Power Dependence of the Shift Caused by Spurious Spectral Components in Atomic Fountain

March 27, 2006
Author(s)
Filippo Levi, Jon H. Shirley, Thomas P. Heavner, Dai Yu, Steven R. Jefferts
In this paper we analyze the behavior of the frequency shift caused by spurious spectral component in the microwave spectrum against variation of the excitation microwave field. The theory of the shift caused by the presence of spurs in the microwave

Spectroscopy of neutral 174 Yb in a one-dimensional optical lattice

March 27, 2006
Author(s)
C Hoyt, Zeb Barber, Christopher W. Oates, A. V. Taichenachev, V. I. Yudin, Leo W. Hollberg
We report spectroscopy of the 1S 0 - 3P 0 clock transition in neutral 174Yb atoms confined to a one- dimensional optical lattice at the ac Stark shift-canceling wavelength of 759.35 nm. Spectroscopic linewidths as narrow as 4 Hz, full width at half-maximum

Failure of Glass Layers on Polymeric Substrates From Vickers Indentation

March 25, 2006
Author(s)
Herzl Chai, Brian R. Lawn
A study is made of median crack evolution in brittle coatings subjected to sharp contacts. A model bilayer system consisting of a glass plate bonded to a polycarbonate base, with a Vickers pyramid as indenter, is used to demonstrate the evolution in situ

Bias Reduction in Roughness Measurement through SEM Noise Removal

March 24, 2006
Author(s)
R Katz, C D. Chase, R Kris, R Peltinov, John S. Villarrubia, B Bunday
The importance of Critical Dimension (CD) roughness metrics such as Line and Contact edge roughness (LER, CER) and their associated width metrics (LWR, CWR) have been dealt with widely in the literature and are becoming semiconductor industry standards
Displaying 34476 - 34500 of 73697
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