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NIST Authors in Bold

Displaying 29876 - 29900 of 73697

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

Performance of CdTe, HPGe and NaI(Tl) Detectors for Radioactivity Measurements

October 16, 2008
Author(s)
A Perez-Andujar, Leticia Pibida
The characteristics and performances of the NIST High Purity Germanium (HPGe), Sodium Iodide (NaI(Tl)) and Cadmium Telluride (CdTe) gamma-ray detectors were studied. The efficiencies, the minimum detectable activities and the energy resolutions each were

PermVials Make for Better GC Analysis

October 16, 2008
Author(s)
Thomas J. Bruno
This poster presents a new sampling technology developed at NIST that combines features of an autosampler vial and a permeatian tube.

Perspectives on the Future of Manufacturing Engineering

October 16, 2008
Author(s)
R Jackson
Technology-based competition is heating up everywhere. One economist uses the analogy-not of a race--but of a casino to convey the flavor of the global competition as well as the nature of the high-risk technology bets that companies confront. Three paths

Pholarization-Locked Temporal Vector Solitions in a Fiber Laser Experiment

October 16, 2008
Author(s)
B C. Collings, S T. Cundiff, N N. Akhmediev, J M. Soto-Crespo, K Bergman, W H. Knox
We experimentally observe polarization-locked vector solitons in a passively modelocked fiber laser. The vector soliton pulse is composed of components along both principal polarization axes of the linearly birfrinent alser cavity. For certain values of
Displaying 29876 - 29900 of 73697
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