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Displaying 1376 - 1400 of 2289

Evaluation of Spacecraft Smoke Detector Performance in the Low-Gravity Environment

April 25, 2018
Author(s)
Jiann C. Yang, Thomas G. Cleary, Marit Meyer, D L. Urban, George W. Mulholland, Victoria Bryg, Zeng-guang Yuan, Gary A. Ruff
In the interest of fire prevention, most materials used in the interior construction of manned spacecraft are non- flammable, however, they do produce smoke when overheated. Spacecraft smoke detectors will ideally detect smoke generated by oxidative

Ion-Gel-Gating-Induced Oxygen Vacancy Formation in Epitaxial La 0.5Sr d0.5^CoO^d3-d Films from in operando X-ray and Neutron Scattering

December 19, 2017
Author(s)
Jeff Walter, Guichuan Yu, Biqiong Yu, Alexander Grutter, Brian Kirby, Julie Borchers, Zhan Zhang, Hua Zhou, Turan Birol, Martin Greven, Chris Leighton
Ionic-liquid/gel-based transistors have emerged as an ideal means to accumulate high charge carrier densities at the surfaces of materials such as oxides, enabling control over electronic phase transitions. Substantial gaps remain in the understanding of

Hydration-Induced Spin-Glass State in a Frustrated Na-Mn-O Triangular Lattice

May 18, 2016
Author(s)
Ioanna Bakaimi, Rosaria Brescia, Craig Brown, Alexander A. Tsirlin, Mark A. Green, Alexandros Lappas
… of the magnetic frustrated, mixed-valent manganese oxide structures, with general formula, Na x MnO 2 . Here we … triangular lattice topology, yields the birnessite type oxide, Na 0.36 MnO 2 &#82260.2H 2 O, transforming its …

Inhibition of DNA glycosylases via small molecule purine analogs

December 9, 2013
Author(s)
M Miral Dizdar, Aaron C. Jacobs, Ajit Jadhav, Dorjbal Dorjsuren, David Maloney, Anton Simeonov, Pawel Jaruga, Amanda K. McCullough, R. S. Lloyd
Following the formation of oxidatively-induced DNA damage, several DNA glycosylases are required to initiate repair of the base lesions that are formed. Recently, NEIL1 and other DNA glycosylases, including OGG1 and NTH1 were identified as potential

Dynamic Stress Analysis Applied to (111)-Textured Pt in HClO_(4) Electrolyte

July 20, 2013
Author(s)
Manon C. Lafouresse, Ugo Bertocci, Gery R. Stafford
… at potentials bound by hydrogen adsorption and platinum oxide formation. In the hydrogen adsorption region, stress … positive potential (\xi)r remains negative in the early oxide region, where the reversible adsorption of O occurs. …

Advanced Distillation Curve Analysis of Marine Diesel Fuel

January 17, 2013
Author(s)
Peter Y. Hsieh, Kathryn R. Abel, Thomas J. Bruno
Ocean-going ships burn heavy fuel oil. The combustion of heavy fuel oil in marine diesel engines emits nitrogen oxides, sulfur oxides, and particulates into the air. Growing public concern over air quality has led to increased scrutiny of heavy fuel oil as

Effect of Tin Doping on alpha-Fe2O3 Photoanodes for Water Splitting

June 28, 2012
Author(s)
Christopher C. Bohn, Amit Agrawal, Erich C. Walter, Mark D. Vaudin, Andrew Herzing, Paul M. Haney, Albert A. Talin, Veronika Szalai
… as a function of distance from the fluorine-doped tin oxide (FTO) interface and was quantified using secondary ion … or dopant concentration, is critical for improving metal oxide performance in water splitting. A more complete …

Photo-induced Surface Transformation of Silica Nanocomposites

June 22, 2012
Author(s)
Justin M. Gorham, Tinh Nguyen, Coralie Bernard, Deborah S. Jacobs, Richard D. Holbrook
The physicochemical, UV-induced surface modifications to silica nanoparticle (SiNP) - epoxy composites have been investigated. The silica nanocomposites (SiNCs) were prepared using a two-part epoxy system with 10 % mass fraction of SiNPs and exposed to

Differences in Polydimethylsiloxane Modification Methods Affect Laminin Deposition and Smooth Muscle Cell Proliferation

April 13, 2011
Author(s)
Joy P. Dunkers, Hae-Jeong Lee, Marvi Matos, Lisa Pakstis, Juan M. Taboas, Steven D. Hudson, Marcus T. Cicerone
When culturing cells on flexible surfaces, it is important to consider extracellular matrix treatments that will remain on the surface under mechanical strain. Here we investigate differences in laminin surfaces that were deposited on oxidized PDMS (plasma

The mouse ortholog of NEIL3 is a functional DNA glycosylase in vitro and in vivo

March 16, 2010
Author(s)
Minin Liu, Viswanath Bandaru, Jeffrey Bond, Pawel Jaruga, Xiaobei Zhao, Plamen P. Christov, Cynthia Burrows, Carmelo J. Rizzo, Miral M. Dizdar, Susan Wallace
To protect cells from oxidative DNA damage and mutagenesis, organisms possess multiple glycosylases to recognize the damaged bases and to initiate the Base Excision Repair (BER) pathway. Recently, three DNA glycosylases were identified in mammals that are

N-Nitrosation of Amines by NO 2 and NO: A Theoretical Study

March 22, 2007
Author(s)
Yi-Lei Zhao, Stephen L. Garrison, Carlos A. Gonzalez, William D. Thweatt, M Marquez
… The aminyl radical intermediate is then quenched by nitric oxide, leading to the formation of nitrosamine. High-level …

Extinguishment of Cup-Burner Flames in Low Gravity

January 1, 2005
Author(s)
F Takahashi, Gregory T. Linteris, V Katta
The effects of oxidizer stream velocity and oxygen concentration, as well as gravity and pressure, on the extinguishment limits of laminar co-flow diffusion flames of methane, formed in a cup-burner apparatus, have been studied experimentally and

Thin-Film Calibration Wafer Materials for RTP Temperature Measurement

July 1, 1999
Author(s)
Kenneth G. Kreider, John G. Gillen
We are developing an instrumented calibration wafer for radiometric temperature measurements that uses thin-film thermocouples to minimize the thermal disturbance of the wafer by the sensors. The thin-film thermocouples are sputter deposited on a thermally

Sol-Gel Materials for Gas Phase Sensing Using Microhotplate Arrays

February 1, 2002
Author(s)
N O. Savage, Richard E. Cavicchi, Michael J. Tarlov, Stephen Semancik, J Greg Gillen
Sol-gel chemistry is used to create suspensions (sols) of small particles of materials such as metal oxides. These suspensions can be dried to a gel or powder or used in the sol form for coatings and thin films. One promising application of sol-gel derived
Displaying 1376 - 1400 of 2289
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