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Displaying 32176 - 32200 of 73697

An Ontology for Assembly Representation

July 1, 2007
Author(s)
Xenia Fiorentini, Iacopo Gambino, V.C. Liang, Sebti Foufou, Sudarsan Rachuri, Mahesh Mani, Conrad E. Bock
Mechanical assemblies are systems composed of modules that are either subassemblies or parts. Traditionally an assembly information model contains information regarding parts, their relationships, and its form. But it is important that the model also

Collaborative Augmented Reality for Better Standards

July 1, 2007
Author(s)
Matthew L. Aronoff, John V. Messina
Concurrent engineering depends on clear communication between all members of the development process. As that communication becomes more and more complex, the quality of the standards used to move and understand that information likewise becomes more and

Data Exchange of Parametric CAD Models Using ISO 10303-108

July 1, 2007
Author(s)
Junhwan Kim, Mike Pratt, Raj G. Iyer, Ram D. Sriram
Modern CAD systems generate feature-based product shape models with parameterization and constraints. Until recently, standards for CAD data exchange among different CAD systems were restricted to the exchange of pure shape information. These standards

Distributed Simulation for Interoperability Testing Along the Supply Chain

July 1, 2007
Author(s)
Sanjay Jain, Frank H. Riddick, Andreas Craens, Deogratias Kibira
The need for interoperability of information systems among supply chain partners has been recognized. A number of standards have been or are being developed to ensure interoperability of applications used along the sup-ply chain. An associated need for

Energy-Level Alignment and Work Function Shifts for Thiol-Bound Monolayers of Conjugated Molecules Self-Assembled on Ag, Cu, Au, and Pt

July 1, 2007
Author(s)
Christopher D. Zangmeister, Laura B. Picraux, Roger D. van Zee, Yuxing Yao, J M. Tour
Photoemission spectra have been used to determine the energy-level alignment and work function of monolayers of 4,4'-bis-(phenylethynyl)benzenethiol, 2 naphthalene thiol, and 3-(naphthalen-2-yl)propane-1-thiol self-assembled on Ag, Cu, Au, and Pt. For each

Environmental Regulations Impose New Product Lifecycle Information Requirements

July 1, 2007
Author(s)
John V. Messina, Eric D. Simmon, Matthew L. Aronoff
In a global response to increasing health and environmental concerns, there has been a trend towards governments enacting legislation to encourage sustainable manufacturing where industry creates products that minimize environmental impact. This

Extracting Electron Densities in N-Type GaAs from Raman Spectra: Theory

July 1, 2007
Author(s)
Herbert S. Bennett
Raman measurements are proposed as a non-destructive method for wafer acceptance tests of carrier density. The interpretation of Raman spectra to determine the majority electron density in n-type semiconductors requires an interdisciplinary effort

Field-free ringing of nanomagnets

July 1, 2007
Author(s)
Thomas J. Silva
Ever since William Gilbert's 16th century treatise "De Magnete," it has been known that magnetic fields can be used to manipulate the magnetic orientation of ferromagnets. This has been the foundation for electronic applications of magnetic materials for

Generic Simulation of Automotive Assembly for Interoperability Testing

July 1, 2007
Author(s)
Deogratias Kibira, Charles R. McLean
Computer simulation is effective in improving the effi-ciency of manufacturing system design, operation, and maintenance. Most simulation models are usually tailored to address a narrow set of industrial issues, e.g., the intro-duction of a new product. If

Implementing a Multiplexed System of Detectors for Higher Photon Counting Rates

July 1, 2007
Author(s)
V Schettini, Sergey Polyakov, Ivo P. Degiovanni, Giorgio Brida, Stefania Castelletto, Alan L. Migdall
Photon counting applications are often limited by detector deadtime to operate at count rates of a few MHz, at best, and often at significantly lower levels. This limitation is becoming more critical as with the advance of photon counting applications such

Interpolation Procedures for Database-Assisted Design

July 1, 2007
Author(s)
Joseph A. Main
Database-assisted design (DAD) is a methodology of designing structures for wind loads that makes direct use of pressure time series from wind tunnel tests. This paper presents interpolation procedures that enable application of the DAD approach for cases

Modeling of Photochemical Reactions in a Focused Laser Beam

July 1, 2007
Author(s)
Fern Y. Hunt, Adolfas Gaigalas, Lili Wang
This paper presents a mathematical model of photodegradation of fluorophores passing through a laser beam. The beam is focused on the sample and thus the power distribution of incident light is strongly dependent on spatial location while the fluorophores

NIST Measurement Services: cw Laser Power and Energy Calibrations at NIST

July 1, 2007
Author(s)
Joshua A. Hadler, Christopher L. Cromer, John H. Lehman
This document describes a calibration service for absolute laser power and energy measurements of laser power meters and detectors used with continuous wave lasers at laser wavelengths between 325 and 1550 nm. In addition to a summary of the calibration

Operational analysis of a quantum dot, optically gated, field-effect transistor as a single-photon detector

July 1, 2007
Author(s)
Eric Gansen, Mary A. Rowe, Marion Greene, Danna Rosenberg, Todd E. Harvey, Mark Su, Robert Hadfield, Sae Woo Nam, Richard Mirin
We report on the operation of a novel single-photon detector, where a layer of self-assembled quantum dots (QDs) is used as an optically addressable floating gate in a GaAs/Al0.2Ga0.8As Δ}-doped field-effect transistor. Photogenerated holes charge the QDs

RAPID INSPECTION OF CARBON NANOTUBE QUALITY

July 1, 2007
Author(s)
Stephanie A. Hooker, Roy H. Geiss, Aparna Kar
Carbon nanotubes have unique properties of interest for applications in aerospace, electronics, and biotechnology. However, the properties of different batches of carbon nanotubes can vary considerably depending on chemical purity and the nanotube types
Displaying 32176 - 32200 of 73697
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