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Materials

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Displaying 1976 - 2000 of 2347

Material properties and fractography of an Indirect Dental Resin Composite.

February 23, 2010
Author(s)
Janet B. Quinn, George D. Quinn
Objectives: Determination of material and fractographic properties of a dental indirect resin composite material. Methods: A resin composite (Paradigm, 3M-ESPE, MN) was characterized by strength, static elastic modulus, Knoop hardness, fracture toughness

Little Things Mean a Lot: Water and the Adhesive Bond

February 21, 2010
Author(s)
Donald L. Hunston, Kar T. Tan, Bryan D. Vogt, Sushil K. Satija, Cyril Clerici, David E. White
The ability of water to dramatically weaken many types of adhesive bonds has been widely studied. One surprising result is the existence of a critical moisture level in the bond. Above this level the strength drops to very low values. Numerous studies have

Roles of Adhesive and Interfacial Properties on Humidity-induced Failure

February 21, 2010
Author(s)
Kar T. Tan, Christopher C. White, Donald L. Hunston, Kristen L. Steffens, Hatlee Timothy, Kristen Hamilton, Vogt D. Bryan
Adhesion loss due to moisture is a fundamental problem in a large diversity of industries ranging from microelectronics and automotive to aerospace. This study investigates the durability of model adhesive joints consisting of a homologous series of poly(n

A Combinatorial Study of Thin Film Process Variables Using Microhotplates

February 17, 2010
Author(s)
David L. Lahr, Joshua L. Hertz, Stephen Semancik
A major goal of materials research over the past two decades has been the development of high throughput methods for rapid discovery and optimization of processing routes. These methods rely on highly parallel materials synthesis to efficiently create

Concrete nanoscience and nanotechnology: Definitions and applications

February 10, 2010
Author(s)
Edward Garboczi
There are many improvements needed in concrete, especially for use in renewal and expansion of the world's infrastructure, e.g. increased durability, decreased brittleness and increased tensile strength, and use of non-traditional materials like fly ash

Rational synthesis and characterization of a new family of low thermal conductivity misfit layered compounds [(PbSe)0.99]m[(WSe2)]n

February 9, 2010
Author(s)
Ian M. Anderson, Michael D. Anderson, Qiyin Lin, Mary Smeller, Colby L. Heideman, Paul Zschack, Mikio Koyano, Robert Kykyneshi, Douglas A. Keszler, David C. Johnson
We describe here a general synthesis approach for the preparation of new families of misfit layer compounds and demonstrate its effectiveness through the preparation of the first 64 members of the [(PbSe)0.99]m(WSe2)n family of compounds, where m and n are

Resistivity Dominated by Surface Scattering in Sub-50 nm Cu Wires

January 25, 2010
Author(s)
Rebekah L. Graham, Glenn Alers, Thomas Mountsier, N. Shamma, S. Dhuey, R. H. Cabrini, Roy H. Geiss, David T. Read, S. Peddeti
The electron scattering mechanisms in sub-50nm copper lines were investigated to understand the extendibility of copper interconnects when the line width or thickness is less than the mean free path. Electron-beam lithography and a dual hardmask approach

Bending of a Bimetallic Beam due to the Kirkendall Effect

January 1, 2010
Author(s)
William J. Boettinger, Geoffrey B. McFadden
The time dependent bending of single phase and two phase bimetal strips due to interdiffusion is computed. The model couples simple beam theory and diffusion, the bending being due to the creation and /annihilation of vacancies necessitated by unequal

IMMOBILIZED ENZYME CATALYZED POLYMERIZATION REACTIONS IN MICROREACTORS

January 1, 2010
Author(s)
Santanu S. Kundu, Atul Bhangale, William E. Wallace, Kathleen M. Flynn, Richard Gross, Kathryn L. Beers
Application of microreactor technologies enable improved safety, selectivity and yield in a range of chemical reactions in addition to new measurement methods that are often faster, cheaper and more accurate than traditional methods. In this study we have

On Lamb Modes as a Function of Acoustic Emission Source Rise Time

January 1, 2010
Author(s)
Marvin A. Hamstad
A study was carried out to examine Lamb-wave modal content as a function of the acoustic emission (AE) source rise time. The study used a validated finite element code to model the source operation and subsequent wave propagation up to a distance of 480 mm

RECENT INVESTIGATIONS OF Sr-Ca-Co-O THERMOELECTRIC MATERIALS

December 21, 2009
Author(s)
Winnie K. Wong-Ng, Guangyao Liu, Makoto Otani, Evan L. Thomas, Nathan Lowhorn, Martin L. Green, James A. Kaduk
Three low-dimension cobaltites in the Sr-Ca-Co-O system have been studied for their structure and thermoelectric properties. Using x-ray pole figure construction technique, a Ca3Co4O9 thin film showed excellent fiber texture but no ab in-plane texture. The

A METHODOLOGY FOR DETECTING RESIDUAL PHOSPHORIC ACID IN POLYBENZOXAZOLE FIBERS

November 24, 2009
Author(s)
Eun S. Park, John R. Sieber, Charles M. Guttman, Kirk D. Rice, Kathleen M. Flynn, Stephanie S. Watson, Gale A. Holmes
There is great interest in the degradation of ballistic fibers from exposure to sunlight and high humidity, because it directly affects the lives of people who use protective ballistic armor. However, to date, no mechanism has been found to explain how
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