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Displaying 31401 - 31425 of 74135

Multiscale Modeling of Lattice Defects in Si-Ge(001) Quantum Wells

April 9, 2008
Author(s)
B. Yang, Vinod Tewary
A computationally efficient hybrid Green¿s function (GF) technique is developed for multiscale modeling of lattice defects in a trilayer material system that links seamlessly the length scales from lattice (sub-nanometers) to continuum (bulk). The model

Need for and Metrological Approaches Towards Standardization of Fluorescence Measurements From the View of National Metrology Institutes

April 9, 2008
Author(s)
Paul C. DeRose, Lili Wang, Adolfas K. Gaigalas, Gary W. Kramer, Ute Resch-Genger, Ulrich Panne
The need for standardization in fluorescence measurements to improve quality assurance and to meet regulatory demands is addressed from the viewpoint of national metrological institutes (NMIs). Classes of fluorescence standards are defined, including

PERFORMANCE OF SEISMIC MOMENT RESISTING CONNECTIONS UNDER COLUMN REMOVAL SCENARIO

April 9, 2008
Author(s)
Fahim Sadek, Hai S. Lew, Joseph A. Main, John L. Gross
Beam-to-column moment connections in steel frame construction have been studied extensively for seismic applications. However, the behavior of such connections has not been studied under the monotonic loading conditions expected in progressive collapse

Spatial Interpolation Algorithm for Error Concealment

April 9, 2008
Author(s)
Hamid Gharavi, Shaoshuai Gao
In this paper, we propose a new spatial interpolation algorithm for Intra-Frame error concealment. The method aims at interpolating areas in the image, which have been affected by packet loss. We have proposed an edge detection technique to aid the

A z-component magneto-resistive sensor

April 8, 2008
Author(s)
Fabio C. da Silva, Sean Halloran, Lu Yuan, David P. Pappas
A thin-film sensor is described that measures the component of the magnetic field perpendicular to the plane of the substrate (also called the z-component field.) The sensors are fabricated on anisotropically etched, V-shaped groves on Si(100) substrates

Clustering Characteristics of Millimeter Wave Indoor Channels

April 8, 2008
Author(s)
Kamran Sayrafian, Behnam Neekzad, John Baras
Temporal-Angular channel sounding measurements of an indoor millimeter wave channel (60 GHz) is analyzed to determine whether ray arrivals at the receiver form clusters in the two-dimensional time-angle space. The channel behavior for directional antennas

Exciton Spectroscopy of Hexagonal BN Using Non-Resonant X-Ray Raman Scattering

April 8, 2008
Author(s)
Y Feng, J A. Soininen, A L. Ankudinov, J O. Cross, Gerald T. Seidler, A T. Macrander, J J. Rehr, Eric L. Shirley
We report non-resonant x-ray Raman scattering (XRS) measurements from hexagonal BN for transferred momentum from 2 Angstrom} -1 to 9 Angstrom} -1 along directions both in and out of the basal plane. A symmetry-based argument together with calculations of

A Layered Approach to Semantic Similarity Analysis of XML Schemas

April 7, 2008
Author(s)
Jaewook Kim, Boonserm Kulvatunyou, Nenad Ivezic, Albert W. Jones
One of the most critical steps to integrating heterogeneous e-Business applications using different XML schemas is schema mapping, which is known to be costly and error-prone. Past schema mapping research has not fully utilized semantic information in the

Communicating, Connecting, and Collaborating: Working with Our Customers

April 7, 2008
Author(s)
Mylene S. Ouimette, Jo Ann Remshard
Moving to a new information or knowledge management system can be a challenge for any institution, but for a large federal government agency the scope of such a project and the effort required can be particularly demanding. This article describes training

Development of a 60 Hz Power Standard using SNS Programmable Josephson Voltage Standards

April 7, 2008
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus, Yonuk Chong, Bryan C. Waltrip, Thomas L. Nelson, J. Williams, D. Henderson, P. Patel, Luis Palafox, Ralf Behr
We are implementing a new standard for 60 Hz power based on precision sinusoidal reference voltages from two independent Programmable Josephson Voltage Standards (PJVS) (one for voltage and one for current). The NIST PJVS systems use series arrays of

Procedures for the Decontamination of Building Plumbing Systems

April 7, 2008
Author(s)
Stephen J. Treado, Mark A. Kedzierski, V. J. Gallardo
This paper presents a discussion of methods for decontaminating building plumbing systems and restoring them to safe operation, based on generic contaminant characteristics. More specific recommendations are being developed that link decontamination

User-Centered Usability Engineering Processes for Websites

April 7, 2008
Author(s)
Theresa O'Connell, E Murphy
For Websites to succeed, they must be user-centered. This is accomplished through usability engineering. The first part of this article gives usability engineering definitions; the second describes its processes.

Energy Systems Management and Greenhouse Gas Reduction

April 6, 2008
Author(s)
Stephen J. Treado, David G. Holmberg
The efficient use of energy provides the double benefits of controlling both energy costs and greenhouse gas (GHG) emissions. The industrial sector comprises about one third of United States GHG emissions, so presents an attractive opportunity for

Measuring the Modulus of Hydrated Contact Lenses via Surface Wrinkling

April 6, 2008
Author(s)
Jun Y. Chung, Young Jong Lee, Peyton Hopson, Michael J. Fasolka, Christopher Stafford
One of the most important considerations in the evaluation of hydrogels for biomedical and contact lens applications is the elastic modulus. The elastic modulus relates to several important factors including flexibility, comfort, adhesion, swelling

Monitoring Alignment of Osteoblast Cells Directed by Gradient Nanopatterns

April 6, 2008
Author(s)
Jirun Sun, Yifu Ding, Nancy J. Lin, Hyun Wook Ro, Christopher L. Soles, Sheng Lin-Gibson
We investigated the behavior of pre-osteoblasts cultured on polystyrene and photopolymerized ethoxylated bisphenol-A dimethacrylate gradient patterns. Gradient patterns varying in height from several hundred to 0 nm were prepared using nanoimprinting

Quantifying Interfacial Adhesion in Transfer Printing via a Cantilever Peel Test

April 6, 2008
Author(s)
Jiong Liu, Jun Y. Chung, Christopher Stafford
Transfer printing has been demonstrated as a fabrication method for flexible organic electronics. The transfer printing process relies on the differential adhesion of a printable layer (PL) that is pressed between two substrates: transfer substrate (TS)

Status and Recent Trends in Cryocooler Research

April 6, 2008
Author(s)
Ray Radebaugh
The five types of cryocoolers used to provide cryogenic temperatures for various applications are the Joule-Thomson, Brayton, Stirling, Gifford-McMahon, and pulse tube cryocoolers. Many advances in all types have occurred in the past twenty years that have

Synthesis and Characterization of Polymer Brushes from PDMS Surfaces

April 6, 2008
Author(s)
Heqing Huang, Adam J. Nolte, Jun Y. Chung, Christopher Stafford
In recent years, poly(dimethylsiloxane) (PDMS) has found increased application in the areas of microfluidic devices, chromatographic packing materials and membranes, as well as in medical and drug delivery devices. However, the hydrophobic surface of PDMS
Displaying 31401 - 31425 of 74135
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