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Displaying 39026 - 39050 of 73830

The Rheology of Cementitious Materials: Chemistry, Colloids and Rocks

May 1, 2004
Author(s)
Robert J. Flatt, Nicos Martys
Knowledge of colloidal science has proven essential in the development of a new generation of dispersants for concrete. These polymer molecules induce steric repulsion between cement particles, reducing agglomeration and allow high workability to be

Thermal and Flammability Properties of Polypropylene/Carbon Nanotube Nanocomposites

May 1, 2004
Author(s)
Takashi Kashiwagi, E A. Grulke, J N. Hilding, Richard H. Harris Jr., John R. Shields, Kathryn M. Butler, K M. Groth, S B. Kharchenko, Jack F. Douglas
The thermal and flammability properties of polypropylene/multi-walled carbon nanotube, (PP/MWNT) nanocomposites were measured with the MWNT content varied from 0.5 % to 4 % by mass. Dispersion of MWNTs in these nanocomposites was characterized by SEM and

Ti ls Pre-Edge Features in Rutile: A Bethe-Salpeter Calculation

May 1, 2004
Author(s)
Eric L. Shirley
This work studies Ti K-edge excitation in rutile TiO2 by considering the x-ray absorption spectrum in a Bethe-Salpeter approach. This work compares resultes obtained by experiment and previous theoretical results obtain within the Anderson impurity model

Tuning Spectral Properties of Fullerenes by Substitutional Doping

May 1, 2004
Author(s)
Rui-Hua Xie, Garnett W. Bryant, G Sun, T Kar, Z Chen, V H. Smith, Y Araki, N Tagmatarchis, H Shinohara, O Ito
We propose a substitutional doping approach to achieve tunable optical properties from fullerenes. Taking Cd60 as an example and using time-dependent density functional theory, we compute the absorption spectra of heterofullerenes Cd60-dn-dm-NdnBdm, and

Uncertainties in Small-Angle Measurement Systems Used to Calibrate Angle Artifacts

May 1, 2004
Author(s)
Jack A. Stone Jr., M Amer, Bryon S. Faust, Jay H. Zimmerman
We have studied a number of effects that can give rise to errors in small-angle measurement systems when they are used to calibrate artifacts such as optical polygons. Of these sources of uncertainty, the most difficult to quantify are errors associated

Vortex Line in a Neutral Finite-Temperature Superfluid Fermi Gas

May 1, 2004
Author(s)
N Nygaard, G M. Bruun, B I. Schneider, Charles W. Clark, D L. Feder
The structure of an isolated vortex in a dilute two-component neutral superfluid Fermi gas is studied within the context of self-consistent Bogoliubov-de Gennes theory. Various thermodynamic properties are calculated and the shift in the critical

Wear Prediction of Ceramics

May 1, 2004
Author(s)
Stephen M. Hsu, M C. Shen
Advanced ceramics are increasingly being used for wear applications. The strength and fatigue resistance of ceramics have increased several fold in the last decade. Wear prediction of ceramics has become an important subject in these arenas. Ceramic wear

Analysis and Design of Parallel Mechanisms With Flexure Joints

April 30, 2004
Author(s)
Byoung H. Kang, J Wen, Nicholas Dagalakis, Jason J. Gorman
Flexure joints are frequently used in precision motion stages and micro-robotic mechanisms due to their monolithic construction. The joint compliance, however, can affect the static and dynamic performance of the overall mechanism.In this paper, we

Computer Security Division 2003 Annual Report

April 30, 2004
Author(s)
Tanya L. Brewer
This report covers the work conducted within the National Institute of Standards and Technology's Computer Security Division during the Fiscal Year 2003. It discusses all projects and programs within the Division, staff highlights, and publications. For

Linear optics quantum computation

April 30, 2004
Author(s)
Emanuel H. Knill
Workshop presentation: Presentation is a high level review of technical and policy issues in quantum information.

In-situ Studies of CO Oxidation on Pt(111): Evidence of a Self-Limiting Reaction at 140 K

April 29, 2004
Author(s)
D J. Burnett, A M. Gabelnick, A T. Capitano, Daniel A. Fischer, J L. Gland
In-situ oxidation experiments in oxygen pressures up to 1.3 Pa indicate that the 140 K carbon monoxide oxidation process is self-limiting. This experimental data suggests that adsorbed atomic oxygen may be responsible for limiting the extent of reaction

Micro-Time-Scale Network Measurements and Harmonic Effects

April 28, 2004
Author(s)
Mark E. Carson, Darrin J. Santay
As network transmission speeds increase, packet streams increasingly uncover fine details of the interior behavior of router hardware and software. This behavior reveals itself as a set of harmonic effects, as interior clocks periodically interrupt packet

Real-Time I/O Performance Metrics and Tests for Industrial Ethernet

April 28, 2004
Author(s)
James D. Gilsinn
Real-time input/output (I/O) communication over Ethernet is still fairly new in the industrial environment. There are many questions about the reliability and performance that have to be answered before industrial Ethernet can be utilized in most
Displaying 39026 - 39050 of 73830
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