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Displaying 2176 - 2200 of 2380

Interrogation of 'Surface', 'Skin' and 'Core' Orientation in Thermotropic Liquid-Crystalline Copolyester Moldings by Near-Edge X-Ray Absorption Fine Structure and Wide-Angle X-Ray Scattering

February 26, 2007
Author(s)
S Rendon, Robert A. Bubeck, L S. Thomas, W R. Burghardt, A Hexemer, Daniel A. Fischer
Injection molding of thermotropic liquid-crystalline polymers (TLCPs) can result in molded articles the exhibit complex orientation states that vary considerably as a function of depth in the part. Skin-core morphologies are often observed in TLCP moldings

Effects of Vacancies on Properties of Relaxor Ferroelectrics: A First-Principles Study

February 13, 2007
Author(s)
L Bellaiche, Jorge Iniguez, Eric J. Cockayne, Benjamin P. Burton
A first-principles-based model is developed to investigate the influence of lead vacancies on the properties of relaxor ferroelectric Pb(Sc1/2Nb1/2)O3 (PSN). Lead vacancies generate large, inhomogeneous, electric fields that reduce barriers between energy

Mechanically Robust Spin-On Organosilicates Glasses for Nanoporous Applications

February 7, 2007
Author(s)
Hyun Wook Ro, K Char, Eun-Chae Jeon, H C. Kim, Dongil Kwon, Hae-Jeong Lee, J. H. Lee, Hee-Woo Rhee, Christopher L. Soles, Do Y. Yoon
An increasing number of technologies demand nanoporous materials with vastly improved physical, mechanical and thermal properties. This manuscript develops the microstructural basis for synthesizing organosilicate glasses (OSGs) with unprecedented thermal

Fabrication and Mechanical Characterization of Carbon Nanotube Based Nanoknives

November 5, 2006
Author(s)
Gurpreet Singh, Paul Rice, Richard J. McIntosh, Roop L. Mahajan
A prototype microtome knife for cutting 100 nm thick slices of frozen-hydrated biological samples has been constructed using multiwalled carbon nanotubes (MWCNT). A piezoelectric-based 3-D manipulator was used inside a Scanning Electron Microscope (SEM) to

Nanoparticle Lithography and Imaging Scanning Probe Microscopy

October 1, 2006
Author(s)
Jaroslaw Grobelny, De-Hao D. Tsai, Doo-In Kim, Pradeep N. Namboodiri, Robert F. Cook, Michael R. Zachariah
Scanning tunnelling microscopy (STM) imaging was performed on goldsurfaces with a large coverage of monodispersed silver nanoparticlessoft-landed on the surface from the gas phase. In both ambient and ultra-highvacuum conditions, STM scanning was found to

NIST Recommended Practice Guide: Fractography of Ceramics and Glasses

September 26, 2006
Author(s)
George D. Quinn
Fractography is a powerful but underutilized tool for the analysis of fractured glasses and ceramics. Fractography can identify the cause of failure and can even provide quantitative information about the loading conditions. The goal of this Guide is to

The 2005 Materials Research Society (MRS) Fall Meeting

September 18, 2006
Author(s)
Winnie K. Wong-Ng
The 2005 Materials Research Society (MRS) Fall Meeting took place in the Hynes Convention Center and the Sheration Boston Hotel, starting the weekend following the Thanksgivings Holidays from November 27 to December 2. This large-scale meeting included

Phase Formation and Properties in the System Bi2O 3:2CoO 1+x:Nb2O5

September 13, 2006
Author(s)
Terrell A. Vanderah, T Siegrist, M W. Lufaso, C Yeager, Juan C. Nino, S Yates, Robert S. Roth
Subsolidus phase relations have been determined for the Bi-Co-Nb-O system in air (750 C to 925 C). Ternary compound formation was limited to pyrochlore (A2B 2O 6O ), which formed a substantial solid solution region at Bi-deficient stoichiometries (relative

Crack Tip Opening Angle: Measurement and Modeling of Fracture Resistance in Low and High Strength Pipeline Steels

September 1, 2006
Author(s)
Philippe P. Darcis, Joseph D. McColskey, Christopher N. McCowan, Thomas A. Siewert, Gabriel Kohn, Arry Bussiba, Richard J. Fields
Crack tip opening angle (CTOA) is becoming one of the more widely accepted properties for characterizing fully plastic fracture. In fact, it has been recognized as a measure of the resistance of a material to fracture, in cases where there is a large

Fatigue Crack Growth Rates in Five Pipeline Steels

September 1, 2006
Author(s)
Arry Bussiba, Philippe P. Darcis, J D. McCloskey, Christopher N. McCowan, Thomas A. Siewert, Gabriel Kohn, R P. Smith, J. Merritt
This study presents fatigue data for six different pipeline steels, with strengths ranging from Grade B to X100. A fatigue crack growth test for full-thickness pipeline samples was developed using a Middle Tension (MT) type specimen. The six steels showed

Second Symposium on Pendulum Impact Machines: Procedures and Specimens

August 1, 2006
Author(s)
Thomas A. Siewert, Christopher N. McCowan, M. P. Manahan
This publication consists primarily of the papers presented at the Second Symposium on Pendulum Impact Machines: Procedures and Specimens, sponsored by ASTM Committee E28 on Mechanical Testing and its Subcommittee E28.07 on Impact Testing. The Symposium

Phase Formation, Crystal Chemistry, and Properties in the Magnetic Dielectric System Bi 2 O 3- Fe 2 O 3- Nb 2 O 5

June 22, 2006
Author(s)
M W. Lufaso, Terrell A. Vanderah, I M. Pazos, Igor Levin, Juan C. Nino, Virgil Provenzano, Peter K. Schenck, Robert S. Roth
Subsolidus phase relations have been determined for the Bi2O3-Fe2O3-Nb2O5 system in air (900-1075 C). Three new ternary phases were observed Bi3Fe0.5Nb1.5O9 with an Aurivillius-type structure, and two phases with approximate stoichiometries Bi17Fe2Nb31O106
Displaying 2176 - 2200 of 2380
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