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Displaying 29901 - 29925 of 73697

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

Precise Wavelengths for Fe, Ge and Pt in the Region Near 1935

October 16, 2008
Author(s)
Gillian Nave, Craig J. Sansonetti
Wavelengths of seven spectral lines of Fe I, Ge I and Pt I between 1932 and 1938 have been measured with uncertainties of less than 1x10 -4 (5 parts in 10 8) using Fourier transform spectroscopy. These lines provide accurate standards for wavelength

Precision Measurement of the 29 Si, 33 S, and 36 Cl Binding Energies

October 16, 2008
Author(s)
Maynard S. Dewey, Ernest G. Kessler Jr., R Deslattes, H G. Borner, M Jentschel, C Doll, P Mutti
The binding energies of 29Si, 33S, and 36Cl have been measured with a relative uncertainty 0.65 x 10 -6 using a flat-crystal spectrometer. The unique features of these measurements are 1) nearly perfect crystals whose lattice spacing is known in meters, 2

Predicting the Location of Low-Angle Boundaries in Single-Crystal Castings

October 16, 2008
Author(s)
R E. Napolitano, Robert J. Schaefer
A set of nickel-based superalloy single-crystal investment castings was produced and evaluated for crystal perfection. Defect structures near the seed emergence point and other geometric features were examined using x-ray topography. Topographic images

Prediction of Uniaxial Extension, Pure Shear and Equibiaxial Responses in Constant Deformation Rate Experiments from Single Step Stress Relaxation Experiments in Uniaxial Extension

October 16, 2008
Author(s)
J M. Niemiec, G B. McKenna, J Sweeney, I M. Ward
In working with non-linear constitutive descriptions for polymer melts, it is often forgotten how difficult it is to obtain the experimental data that are essential to their implementation in other than laboratory level tests. Here we adopt methods that

Preface to Dislocatrions 2000 Proceedings

October 16, 2008
Author(s)
Lyle E. Levine, L -. Kubin, R -. Becker
During the 1950's and 1960's, a widespread international effort was underway to lay the foundations for a fundamental, dislocations-based understanding of plastic deformation and strain hardening. This effort lagged, however, as the existing theoretical

Primary Radioactive Gas Standards (Excluding Radon)

October 16, 2008
Author(s)
Michael P. Unterweger
This paper presents an overview of the primary calibration of radioactive gas standards using length-compensated internal gas counters. The principal of length compensation and the effects of high voltage, detector material, and gas pressure are discussed
Displaying 29901 - 29925 of 73697
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