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Displaying 46901 - 46925 of 73697

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

What Is This Thing Called Conformance?

December 1, 2000
Author(s)
Lynne S. Rosenthal, Mary C. Brady
XML developers claim they do it. OASIS, NIST, and W3C are building it. And, standards often require it. What is it?Conformance is usually defined as a way to determine if an implementation faithfully meets the requirements of a standard or specification

What Metrology Gains With Quantized Resistance Standards

December 1, 2000
Author(s)
Randolph E. Elmquist
The emergence of quantum metrology is expressed in modern electrical standards, primarily through the Josephson effect and the quantum Hall effect. The Josephson and von Klitzing constants that relate to these standards are given in quantum theory by ideal

Workability of Self-Compacting Concrete

December 1, 2000
Author(s)
Chiara F. Ferraris, L Brower, C H. Ozyildirim, J A. Daczko
The slump test is widely used to evaluate the workability of Concrete. However it has serious drawbacks, especially for self-compacting concrete (SCC). Other flow characteristics such as viscosity or filling capacity or time of flow through an orifice are

Balancing the Environmental and Economic Performance of Products.

November 30, 2000
Author(s)
Barbara C. Lippiatt, A S. Boyles
How do you select environmentally preferable products? Is a product environmentally preferable if it has recycled content? Is it not preferable if it offgasses during use? Are mainstream products always less preferable than products marketed and perceived

DASA Laser Range Camera Evaluation

November 30, 2000
Author(s)
C Chow, Michael O. Shneier
The DASA Laser Range Camera is a novel sensor that can be used to capture range images over distances from 0.5 meters to 30 meters, depending on the configuration. Unlike most laser ranging devices, it captures a whole image at once, rather than scanning
Displaying 46901 - 46925 of 73697
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