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Search Publications

NIST Authors in Bold

Displaying 30001 - 30025 of 73829

On the Detection of Rare, and Moderately Rare Nuclear Events

October 16, 2008
Author(s)
Lloyd A. Currie
Some of the more important developments in science and practical demands in commerce have been linked to attempts to detect rare events and rare contaminants, ranging from the early counting of solar neutrinos to the occurrence of dodder seeds in clover

On the Existence and Stability of Quadrijunctions

October 16, 2008
Author(s)
John W. Cahn, E S. Vanleck
The existence and stability of various microstructural features for two-phase materials with anisotropic energies is discussed. In particular, the existence of quadri and tri-junctions for energies with different symmetry properties is examined. An Ising

On-Line Process Control

October 16, 2008
Author(s)
Raghu N. Kacker, Nien-Fan Zhang
The natural state of manufacturing and measurement processes is usually nonstationary. The methods of statistical process control (SPC) are therefore inappropriate for on-line control. This paper provides a simple and generic protocol for on-line control

One Dimensional Modeling and Learning

October 16, 2008
Author(s)
J E. Devaney
This paper introduces four new algorithms, the M-algorithm, the L-algorithm, the S-algorithm and the T-algorithm, which enable recognition of distributional functions without doing a fit of the data to the distribution. These algorithms workbest for large

Opportunities for Development of Reference Materials for Beryllium

October 16, 2008
Author(s)
Robert Watters, Aleksander B. Stefaniak, Mark D. Hoover
Reference materials provide the foundation for assessment of analytical chemistry methods, accurate quantification of occupational and environmental exposures, and conduct of in vitro and in vivo toxicology studies for health effects research. Currently

Optical Frequency Combs: From Frequency Metrology to Optical Phase Control

October 16, 2008
Author(s)
Jun Ye, H Schnatz, Leo W. Hollberg
A remarkable synergy between traditionally CW laser-based precision optical frequency metrology and mode-locked ultrafast lasers has led to precision control of the frequency spectrum produced by mode-locked lasers. Such a phase - controlled mode-locked

Optical Frequency Standards and Their Measurement

October 16, 2008
Author(s)
John L. Hall, Jun Ye
The last four years have seen a revolution in the art and practice of optical frequency measurement. Indeed the gearbox represented by the spectrally-broadened fs laser's comb has sufficiently low noise that we in the optics community have abruptly found

Optical frequency standards: Progress and applications

October 16, 2008
Author(s)
John L. Hall, Jun Ye, L -. Ma, K R. Vogel, Tim P. Dinneen
A number of individual small advances, taken together, bring us to the beginning of a new domain of optical frequency stability, reproducibility, and measurements. Particular advances include the refinment of Noise-Immune Cavity-Enhanced Optical Heterodyne

Optical Properties of Amphibole Asbestos

October 16, 2008
Author(s)
Jennifer R. Verkouteren, A G. Wylie
The fibrillar growth habit and 100} twinning may produce anomalous optical properties in fibrous amphiboles. The optical properties of 16 fibrous tremolite, actinolite, and ferro-actinolite samples from Verkouteren and Wylie (2000) are described. One

Optical Thermometry of Semiconductor Processing Plasmas

October 16, 2008
Author(s)
Eric C. Benck
Temperatures within semiconductor processing plasmas are important since they control the various reaction rates of the plasma and consequentially can significantly influence the rate and quality of etching or deposition. The nonequilibrium nature of these

Organizing Self-Assembled Porphyrin Arrays on Metal and Glass Surfaces

October 16, 2008
Author(s)
J Batteas, J C. Garno, Charles M. Drain, G Smeureanu, T Milic
Herein we report an investigation of the surface organization of tetrameric arrays of porphyrins self-assembled by metal ion coordination to exocyclic pyridyl ligands. Four supramolecular porphyrinic squares were made to investigate the commingled roles of

Origin of Discrepancies in Inelastic Electron Tunneling Spectra ofMolecular Junctions

October 16, 2008
Author(s)
Lam H. Yu, Christopher D. Zangmeister, James G. Kushmerick
We report inelastic electron tunneling spectroscopy (IETS) of multilayer molecular junctions with and without incorporated metal nano-particles. The incorporation of metal nanoparticles into our devices leads to enhanced IET intensity and a modified line

Overview of Radiation Thermometry

October 16, 2008
Author(s)
B. Carol Johnson
Researchers in the Optical Technology Division utilize measurements of radiant flux to determine temperature. This includes the dissemination of the ITS-90 above 961.78 degrees C using spectral radiance ratios (optical pyrometry) and absolute measurements

Overview of the Development of Technical Infrastructure in the Asia-Pacific Region: the Work of the Asia-Pacific Economic Cooperation (APEC) Sub-Committee on Standards and Conformance (SCSC) and the Specialist Regional Body

October 16, 2008
Author(s)
C R. DeVaux
The development and maintenance of an economy's standards and conformance technical infrastructure is critical to its economic health. By increasing the competence of its measurement and testing capabilities, in particular, and economy can provide

Parameter Design for Measurement Protocols by Latent Variable Methods

October 16, 2008
Author(s)
Walter S. Liggett Jr
We present an approach to measurement system parameter design that does not require the values of the experimental units be known. The approach does require experimental units grouped in classes, a necessity when protocol execution alters the unit. A

Particle Characteristics of Trace High Explosives: RDX and PETN

October 16, 2008
Author(s)
Jennifer R. Verkouteren
The sizes of explosives particles in fingerprint residues produced from C-4 and Semtex-1A were investigated with respect to a fragmentation model. Particles produced by crushing RDX and PETN were sized by using scanning electron microscopy combined with

Particle Growth in Silane RF Discharges

October 16, 2008
Author(s)
Alan Gallagher
Calculations and measurements of particle growth in silane RF capacitively coupled discharges are reported. The measurements of particle diameters of 8 nm to 50 nm. This particle growth is typically 50 times as fast as film growth, and measured density

Perfect Quantum State Transfer With Superconducting Phase Qubits

October 16, 2008
Author(s)
Frederick Strauch, Carl J. Williams
Superconducting quantum circuits, fabricated with multiple layers, are proposed to implement perfect quantum state transfer between nodes of a hypercube network. For tunable devices such as the phase qubit, each node can transmit quantum information to any

Performance Evaluation of a Parallel and a Hybrid Machine Tool

October 16, 2008
Author(s)
Johannes A. Soons, S M. Athavale, R Furness
vances in both the technology and cost of controllers have enabled the commercial introduction of machine tools with a parallel configuration of the positioning axes. In theory, this radical change in design enables improvements in key machine
Displaying 30001 - 30025 of 73829
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