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Displaying 30101 - 30125 of 73929

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

Planning to Deliver Scientific Information to the Next Generation of Scientists

October 16, 2008
Author(s)
Terrie Wheeler, Mylene S. Ouimette
The Information Services Division (ISD) of the National Institute of Standards and Technology (NIST) sought to determine the information needs of the millennial scientists who will be entering its workforce in the next five years. Conducted as a two-year

Poisson Ratio and Covalency - Ionicity

October 16, 2008
Author(s)
H M. Ledbetter, Sung Kim
For twenty-one 8-N (octet) compounds, we consider the dependence of the Poisson ratio upsilion} on fractional covalent-ionic character estimated from atomic electronegativites. Compounds with ionicity approaching 1.0 show Poisson ratios near the upper

Polarization Locked Vector Solitons and Axis Instability in Optical Fiber

October 16, 2008
Author(s)
S T. Cundiff, B C. Collings, K Bergman
We experimentally observe polarization-locked vector solitons in optical fiber. Polarization locked-vector solitons use nonlinearity to preserve their polarization state despite the presence of birefringence. To achieve conditions where the delicate

Polarization-Locked Temporal Vector Solitons

October 16, 2008
Author(s)
Steven T. Cundiff, B C. Collins, N N. Akhmediev, J M. Soto-Crespo, K Bergman, W H. Knox
Solitons are the subject of substantial research because of potential applications in high-speed fiber-optics communications. However, discussions of soliton propagation often ignore polarization and use scaler equations to describe their evolution

Polarization-Locked Temporal Vector Solitons in a Fiber Laser: Theory

October 16, 2008
Author(s)
J M. Soto-Crespo, N N. Akhmediev, B C. Collings, S T. Cundiff, K Bergman, W H. Knox
Stable polarization-locked temporal vector solitons are found in a saturable absorber modelocked fiber laser with weak cavity birefringence. The system is theoretically modeled with two coupled complex Ginzburg-Landau equations that include fiber

Polycapillary X-Ray Optics for X-Ray Astronomy

October 16, 2008
Author(s)
C H. Russell, Andrey Guber, K Kolodziejczak, M Joy, C A. MacDonald, W M. Gibson
High-energy x-ray spectrometry from astronomical sources is difficult due to low flux rates and high background. Polycapillary X-ray optics can be used to increase the signal-to-noise ratio by focusing photons onto a small energy dispersive detector. Two

Polymer-Surface Interactions in Nanfilled Polymers

October 16, 2008
Author(s)
Alamgir Karim, Jack F. Douglas, A Nakatani, Eric J. Amis, D B. Majumdar
We review recent investigations of conventional and nanoparticle filled polymers using atomic force and optical microscopy, scattering (x-ray, neutron and visible light) to characterize the influence of filler particles on the phase separation morphology

POLYMER99 - NIST Polymers Division Published Works for 1999

October 16, 2008
Author(s)
J D. Barnes, B M. Fanconi, Eric J. Amis
This publication is a compilation of 104 documents that were published by staff of the NIST Polymers Division during Calendar year 1999. The documents are in a Portable Document Format (PDF) so that they can be read on most computers. Indexes and
Displaying 30101 - 30125 of 73929
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