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Displaying 1926 - 1950 of 2146

Fracture Toughness through a Welded Pipeline Section - Crack Tip Opening Angle Criterion

April 23, 2007
Author(s)
Philippe P. Darcis, Christopher N. McCowan, Elizabeth S. Drexler, Joseph D. McColskey, Avigdor Shtechman, Thomas A. Siewert
The increasing demand for natural gas as an alternative energy source implies continued growth of gas pipeline installations. This trend compels the natural gas transmission industry to consider the construction of larger-diameter, higher-pressure

Broadband Electrical Characterization of Multiwalled Carbon Nanotubes and Contacts

March 22, 2007
Author(s)
Paul Rice, T. M. Wallis, Stephen E. Russek, Pavel Kabos
We have welded an individual multiwalled carbon nanotube (MWNT) onto a microlithographically-patterned coplanar waveguide (CPW) and measured the electrical response of the nanotube and the contacts from 100 MHz to 24 GHz. The MWNT was welded to the CPW in

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
Displaying 1926 - 1950 of 2146