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Displaying 47351 - 47375 of 74160

Preparation and Certification of K-411 Glass Microspheres

December 1, 2000
Author(s)
Ryna B. Marinenko, S V. Roberson, J S. Small, Barbara B. Thorne, Douglas H. Blackburn, D Kauffman, Stefan D. Leigh
The production and characterization of NBS K-411 glass microspheres in the 3-40 um range for certification as a NIST Standard Reference Material (SRM) are described. EDS quantitative analysis and heterogeneity evaluations of the microspheres were made with

Radiated Power Measurements in Reverberation Chambers

December 1, 2000
Author(s)
Galen H. Koepke, John M. Ladbury
The electromagnetic reverberation chamber is widely used as a test facility to generate complex fields for interference and compatibility measurements. The chamber is also effective as a method to quantify the total radiated power from an emitter

Reduction of Cobalt and Iron Phthalocyanines and the Role of the Reduced Species in Catalyzed Photoreduction of CO 2

December 1, 2000
Author(s)
J Grodkowski, T Dhanasekaran, Pedatsur Neta, P Hambright, Bruce S. Brunschwig, K Shinozaki, E Fujita
The role of cobalt and iron phthalocyanines in catalytic CO 2 reduction has been studied. Chemical, photochemical, and radiolytic reductions of the metal phthalocyanines (Pc) have been carried out in organic solvents, and reduction of their tetrasulfonated

Repair of oxidative DNA damage in Drosophila melanogaster: identification and characterization of dOgg1, a second DNA glycosylase activity for 8-hydroxyguanine and formamidopyrimidines

December 1, 2000
Author(s)
C. Dherin, M. Dizdaroglu, H. Doerflinger, S. Boiteux, J. P. Radicella
In Drosophila, the S3 ribosomal protein has been shown to act as a DNA glycosylase/AP lyase capable of releasing 8-hydroxyguanine (8-OH-Gua) in damaged DNA. Here we describe a second Drosophila protein (dOggl) with 8-OH-Gua and abasic (AP) site DNA repair

SIM Comparison of Electrical Units

December 1, 2000
Author(s)
Harold Sanchez, J. Cioffi, H. Laiz, D. Bennett, H. Ferreira, R. Ortega, Nile M. Oldham, Mark E. Parker
An international comparison of dc and low-frequency electrical units conducted between 19 laboratories in 16 countries in the Americas is described. The comparison was conducted between 1997 and 1999 and sponsored by the Interamerican Metrology System and

Simultaneous Measurement of Group and Phase Delay Between Two Photons

December 1, 2000
Author(s)
D A. Branning, Alan L. Migdall, A V. Sergienko
We report on an experiment to determine both the group and phase delays experienced by orthogonally polarized photon pairs travelling through a birefringent medium. Both types of delay are determined from the same set of coincidence-counting data. The

Small-Angle Neutron Scattering Measurements of Nanoscale Lithographic Features

December 1, 2000
Author(s)
Wen-Li Wu, Eric K. Lin, Q Lin, M Angelopoulos
The continuing decrease in feature sizes in the semiconductor and other nanofabriation industries has placed increasingly stringent demands on current microscopy-based techniques to precisely measure both the critical dimensions and the quality (i.e. line

Superconformal Electrodeposition of Copper in 500-90 nm Features

December 1, 2000
Author(s)
Thomas P. Moffat, Daniel Wheeler, W H. Huber, Daniel Josell
Superconformal electrodeposition of copper in 500 nm deep trenches ranging from 500 to 90 nm in width has been demonstrated using an acid cupric sulfate electrolyte containing chloride (C1), polyethylene glycol (PEG), and 3-meracapto- 1propanesulfonate

The Effect of Vibrational Relaxation of the Discharge Coefficient of Critical Flow Venturis

December 1, 2000
Author(s)
Aaron N. Johnson, John D. Wright, Shin-ichi Nakao, C L. Merkle, Michael R. Moldover
This paper identifies a new mechanism that can affect the discharge coefficient of critical nozzle flows. Specifically, vibrational relaxation effects are demonstrated to significantly influence the discharge coefficient of selected gases in critical

The Free Energy Surface of Supercooled Water

December 1, 2000
Author(s)
A Scala, Francis W. Starr, E LaNave, H E. Stanley, F Sciortino
We present a detailed analysis of the free energy surface of a well studied model of water in supercooled states. We propose a functional form for the liquid free energy supported by recent theoretical predictions [Y. Rosenfeld and P. Tarazona, Mol. Phys

The IMS Mission Architecture for Distributed Manufacturing Simulation

December 1, 2000
Author(s)
Frank H. Riddick, Charles R. McLean
This paper presents an overview of a neutral reference architecture for integrating distributed manufacturing simulation systems with each other, with other manufacturing software applications, and with manufacturing data repositories. Other manufacturing

Video Based Metrologly

December 1, 2000
Author(s)
Theodore D. Doiron, Tsai H. Hong, John R. Stoup, Marilyn N. Abrams
Video cameras are increasingly used to make dimensional measurements. Many of these systems use interpolation of the pixel data, with some systems claiming to find edges with precision of 1/100 of a pixel. We have studied the response of single pixels of a
Displaying 47351 - 47375 of 74160
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