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Displaying 22726 - 22750 of 74036

An evaluation of local shape descriptors for 3D shape retrieval

September 26, 2012
Author(s)
Afzal A. Godil, Sarah Y. Tang
As the usage of 3D models increases, so does the importance of developing accurate 3D shape retrieval algorithms. A common approach is to calculate a shape descriptor for each object, which can then be compared to determine two objects’ similarity. However

Controlling Thermochromism in a Photonic Block Copolymer Gel

September 26, 2012
Author(s)
Joseph J. Walish, Yin Fan , Andrea Centrone, Edwin L. Thomas
Controlling the color via temperature-induced changes of self-assembled photonic materials is important for their application in sensors and displays. The thermochromic behavior of a PS-P2VP photonic gel was studied (UV-VIS, FTIR) and found to originate

Cup-Burner Flame Structure and Extinguishment by C2HF5 in Microgravity

September 26, 2012
Author(s)
Gregory T. Linteris, Fumiaki Takahashi, Viswanath R. Katta, Oliver Meier
The effects of fire-extinguishing agent C2HF5 (pentafluoroethane, HFC-125) added to a coflowing airstream on the structure and extinguishing processes of microgravity cup-burner flames have been studied numerically. Propane and a propane-ethanol-water fuel

Evaluating Potential Bias in Non-Randomly Reported Fire Incident Data

September 26, 2012
Author(s)
David T. Butry, Douglas S. Thomas
This analysis is a part of an effort to develop statistics and uncertainty measures for characterizing, tracking, and better understanding the root causes of the total burden of fire in the United States. They will be used to develop performance metrics

Factors Influencing the Smoldering Performance of Polyurethane Foam

September 26, 2012
Author(s)
Mauro Zammarano, Szabolcs Matko, Roland H. Kraemer, Rick D. Davis, Jeffrey W. Gilman, Shivani N. Mehta
The objective of this study was to evaluate whether polyurethane foam (PUF) could be produced as a standard reference material for ultimate use in a standard test intended to ensure the smoldering performance of commercially available upholstered furniture

Simple device for rare cell capture from whole blood

September 26, 2012
Author(s)
Jason G. Kralj, Samuel P. Forry, Matt S. Munson, Thomas P. Forbes, Chandamany Arya, Lynn Sorbara, Alessandro Tona, Sudhir Srivastava
We have developed a system to isolate rare cells from whole blood using commercially available components and simple microfluidics that can provide biologists with the capabilities of the monolithic devices. We characterized the capture of MCF-7 cells

Variances of Cylinder Parameters Fitted to Range Data

September 26, 2012
Author(s)
Marek Franaszek
Industrial pipelines are frequently scanned with 3D imaging systems (e.g., LADAR) and cylinders are fitted to the collected data. Then, the fitted as-built model is compared with the as-designed model. Meaningful comparison between the two models requires

Near-infrared calibration systems for precise radial-velocity measurements

September 24, 2012
Author(s)
Stephen L. Redman, Florian Kerber, Gillian Nave, Suvrath Mahadevan, Lawrence W. Ramsey, Jonathan Smoker, H-U Kaufl, Pedro Figueira
We present work done to prepare two new near-infrared calibration sources for use on high-precision astrophysical spectrographs. Uranium-neon is an atomic calibration source, commercially available as a hollow-cathode lamp, with over 10 000 known emission

Radiation Pattern of an UWB Wearable Antenna: A Preliminary Study

September 24, 2012
Author(s)
Wen-Bin Yang, Kamran Sayrafian
Inhomogeneity of the propagation medium in body area networks could have a great impact on the sensor node's antenna characteristics. This in turn could affect the quality of the communication links unless the impact of the human body has been properly

The Habitable-Zone Planet Finder: A Stabilized Fiber-Fed NIR Spectrograph for the Hobby-Eberly Telescope

September 24, 2012
Author(s)
Scott A. Diddams, Suvrath Mahadevan, Lawrence W. Ramsey, Chad F. Bender, Ryan Terrien, Jason T. Wright, Samuel Halverson, Fred Hearty, Matthew Nelson, Adam Burton, Stephen L. Redman, Steve Osterman, James Kasting, Michael Endl
We present the scientific motivation and conceptual design for the recently funded Habitable-zone Planet Finder (HPF), a stabilized fiber-fed near-infrared (NIR) spectrograph for the 10 meter class Hobby-Eberly Telescope(HET) that will be capable of

Characterization and In-situ Monitoring of Sub-stoichiometric Adjustable TC Titanium Nitride Growth

September 21, 2012
Author(s)
Michael R. Vissers, Jiansong Gao, Jeffrey S. Kline, Martin O. Sandberg, Martin P. Weides, David S. Wisbey, David P. Pappas
The structural and electrical properties of Ti-N films deposited by reactive sputtering depend on their growth parameters, in particular the Ar:N2 gas ratio. We show that the nitrogen percentage changes the crystallographic phase of the film progressively

Development of a fully automated LED lifetime test system

September 21, 2012
Author(s)
Yuqin Zong, Jeff Hulett
A fully automated system for light-emitting diode (LED) lifetime test has been developed and is undergoing validation. This system uses a 1 m integrating sphere for both aging and optical measurements of 480 LEDs. It features six test zones, each of which

PEG-Labeled Nucleotides and Nanopore Detection for Single Molecule DNA Sequencing by Synthesis

September 21, 2012
Author(s)
Shiv Kumar, Tao Chuanjuan, Chien Minchen, Hellner Brittney, Joseph W. Robertson, Arvind Balijepalli, Li Zengmin, James J. Russo, Joseph E. Reiner, John J. Kasianowicz, Jingyue Ju
There is a significant need to accurately sequence single DNA and RNA molecules for personalized medicine. We describe a novel nanopore-based sequencing by synthesis (SBS) strategy that will accurately differentiate at single molecule level four different

Anomalous Friction in Suspended Graphene

September 20, 2012
Author(s)
Alexander Y. Smolyanitsky, Jason P. Killgore
Since the discovery of the Amonton's law and with support of modern tribological models, friction between surfaces of three-dimensional materials is known to generally increase when the surfaces are in closer contact. Here, using molecular dynamics
Displaying 22726 - 22750 of 74036
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