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Displaying 26776 - 26800 of 73832

GRADED STRUCTURES FOR ALL-CERAMIC RESTORATIONS

May 17, 2010
Author(s)
Yu Zhang, H Chai, Brian R. Lawn
One failure mode of all-ceramic crown restorations is radial cracking at the cementation surface, from occlusally-induced flexure of the stiffer crown layer on the softer dentin underlayer. We hypothesize that such failure may be substantially mitigated by

INVESTIGATING WIND DRIVEN FIREBRAND PENETRATION INTO BUILDING VENTS

May 17, 2010
Author(s)
Samuel L. Manzello, Sayaka S. Suzuki, Yoshihiko Hayashi
Evidence suggests that wind driven firebrand showers are responsible for a majority of structure ignitions in Wildland-Urban Interface (WUI) fires in the USA and urban fires in Japan. This study is aimed at extensively quantifying firebrand penetration

Simultaneous XAFS Measurements of Multiple Samples

May 17, 2010
Author(s)
Bruce D. Ravel, C. Scorzato, D. P. Siddons, S. D. Kelly, S. R. Bare
A four-channel ionization chamber has been designed, constructed and tested. This ionization chamber allows X-ray absorption spectra to be collected in transmission from up to four samples simultaneously. This results in spectra that are free of systematic

Study of Proposed Internet Congestion-Control Mechanisms

May 17, 2010
Author(s)
Kevin L. Mills, James J. Filliben, Dong Y. Cho, Edward J. Schwartz, Daniel I. Genin
This study describes a coherent set of modeling and analysis methods to investigate the behavior of large distributed systems. The methods are applied to compare several proposed Internet congestion-control mechanisms operating under a wide range of

An Ultra-Stable Platform for the Study of Single-Atom Chains

May 16, 2010
Author(s)
Douglas T. Smith, Jon R. Pratt, Francesca M. Tavazza, Lyle E. Levine, Anne M. Chaka
We describe a surface probe instrument capable of sustaining single-atomic-bond junctions in the electronic quantum-conduction regime for tens of minutes, and present results for Au junctions that can be locked stably in n = 1 and n = 2 quantum conduction

Critical Constants of Organic Compounds

May 16, 2010
Author(s)
Chris D. Muzny, Vladimir Diky, Andrei F. Kazakov, Robert D. Chirico, Michael D. Frenkel
The parameters of the liquid-gas critical point are important constants in determining the behavior of fluids. This table lists the critical temperature, pressure, and molar volume, as well as the normal boiling point, for over 850 organic substances. The

Mid-IR frequency comb upconversion spectroscopy

May 16, 2010
Author(s)
Todd Johnson, Scott A. Diddams
We present a mid-infrared frequency comb generated via differency frequency mixing of a Yb femtosecond fiber laser. After passing through a methane gas sample, the MIR comb is upconverted and dispersed onto a CCD for detection.

Preserving quantum coherence using optimized open-loop control techniques

May 16, 2010
Author(s)
Michael J. Biercuk, Hermann Uys, Aaron Vandevender, Nobuyasu Shiga, Wayne M. Itano, John J. Bollinger
We describe experimental and theoretical studies of open-loop quantum control techniques known as dynamical decoupling (DD) for the suppression of decoherence-induced errors in quantum systems. Our experiments on trapped atomic ion qubits demonstrate that

Tailored State Preparation for Solid State Quantum Memory

May 16, 2010
Author(s)
Elizabeth A. Goldschmidt, Sergey V. Polyakov, Sarah E. Beavan, Jingyun Fan, Alan L. Migdall
We use spectral hole burning in Pr3+:Y2SiO5 in order to prepare spectral distributions of ions optimized for using such a material as a quantum memory for photon states. Our spectral hole-burning implementations include preparing an ensemble of ions to be

Atomistic simulation of hillock growth

May 15, 2010
Author(s)
Timofey Frolov, William J. Boettinger, Yuri Mishin
The goal of this paper is to explore mechanisms of hillock and whisker growth in stressed poly-crystalline films by molecular dynamics simulations. Our stress-free model consists of three grains and a triple line aligned perpendicular to a free surface

The Impact of Long-term Memory Effects on Diode Power Probes

May 15, 2010
Author(s)
Catherine A. Remley, Hugo Gomes, Alejandro Testera, Nuno B. Carvalho, Monica Barciela
This paper presents an analysis of long term memory effects on power measurements using diode power probes. It will be shown that a power probe calibrated with a single-tone sinusoidal excitation can provide erroneous values when used with modulated

An Other-Race Effect for Face Recognition Algorithms

May 13, 2010
Author(s)
P J. Phillips, Alice J. O'Toole, Abhijit Narvekar, Fang Jiang, Julianne Ayadd
Psychology research has shown that human face recognition is more accurate for faces of one�s own race than for faces of other races. In recent years, interest in accurate computer-based face recognition systems has spurred the development of these systems

Electrodeposition of Metastable Au-Ni Alloys

May 13, 2010
Author(s)
Gery R. Stafford, E. Rouya, Ugo Bertocci, J. J. Mallett, R. Schad, M. R. Begley, R. G. Kelly, M. Reed, G. Zangari
The electrodeposition of Au-Ni alloys from near neutral, sulfite-based electrolytes derived from a commercial bath for soft gold plating is investigated. Alloy compositions ranging from 0 to 90 at% Ni were obtained by varying the deposition potential, with

A Virtual Machining Model for Sustainability Analysis

May 12, 2010
Author(s)
Guodong Shao, Deogratias Kibira, Kevin W. Lyons
Sustainability has become a very significant research topic since it impacts many different manufacturing industries. The adoption of sustainable manufacturing practices and technologies offers industry a cost effective route to improve economic

Impact of Energy Measurements in Machining Operations

May 12, 2010
Author(s)
Minna S. Lanz, Mahesh Mani, Swee K. Leong, Kevin W. Lyons, Ari Ranta, Kimmo Ikkala, Nils Bengtsson
OOver the past years, institutions in general are increasingly interested and involved in sustainability and social responsibility. In addition, social and political pressures have led to the creation of new regulations and policies that support new

Predicting the In-Service Performance of Materials Exposed to Outdoor Weathering

May 12, 2010
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston
Test methods were developed to duplicate the failure modes that occur to sealants during exposure in structures. The methods used a systematic approach to identify independent and synergistic effects of various aging factors on the durability of sealants

STRUCTURAL RESPONSE OF WTC 7 FLOOR SYSTEMS TO FIRE

May 12, 2010
Author(s)
Therese P. McAllister
The WTC 7 investigation by the National Institute of Standards and Technology (NIST) identified several factors that alone, or in combination, led to fire-induced failures of the floors, and subsequently, total collapse of the 47-story WTC 7 building. A

The NIST Handbook of Mathematical Functions

May 12, 2010
Author(s)
Frank W. Olver, Daniel W. Lozier, Ronald Boisvert, Charles W. Clark
The NIST Handbook of Mathematical Functions supplies validated reference information in 36 chapters on a wide selection of important mathematical functions, covering the properties necessary for their use in scientific applications, together with general
Displaying 26776 - 26800 of 73832
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