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Topic Area: Materials Science

Displaying records 301 to 310 of 482 records.
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301. Summary of Charpy Impact Verificaiton Data: 1994-1996
Topic: Materials Science
Published: 3/2/2009
Authors: Christopher N McCowan, C M Wang, D P Vigliotti
Abstract: We present a summary of Charpy impact verification test data that were evaluated by the National Institute of Standards and Tecnology (NIST) from January 1994 to December 1996. The Charpy impact machines that met the verification rule that limits th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851206

302. The molecular basis of mesophase ordering in a thiophene-based copolymer
Topic: Materials Science
Published: 2/18/2009
Authors: Dean M DeLongchamp, Regis J Kline, Youngsuk Jung, Eric K Lin, Daniel A Fischer, David J Gundlach, Andrew Moad, Lee J Richter, Michael F. Toney, Martin Heeney, Iain McCulloch
Abstract: The carrier mobility of poly(2,5-bis(3-alkylthiophen-2-yl) thieno[3,2-b]thiophene) semiconductors can be substantially enhanced after heating through a thermotropic mesophase transition, which causes a significant improvement in thin film structural ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852781

303. Adhesion at layer-by-layer surfaces in aqueous environments
Topic: Materials Science
Published: 2/15/2009
Authors: Adam J. Nolte, Jun Y. Chung, Marlon L Walker, Christopher M Stafford
Abstract: Adhesion between materials is often governed by the ambient environment, which can mediate or change the types of molecular interactions present at an interface. Biological interactions, for example, can be mediated by factors such as temperature, i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901360

304. High-throughput measurements of viscoelastic properties using surface indentation
Topic: Materials Science
Published: 2/15/2009
Authors: Peter M. Johnson, Christopher M Stafford
Abstract: Relaxation processes in viscous liquids and glasses have been studied extensively, but the underlying causes of glassy behavior in polymeric systems remains as a major unsolved area of condensed matter physics. These processes are critical in the de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901366

305. Ultrathin Adhesives: Confinement Effect on Modulus
Topic: Materials Science
Published: 2/15/2009
Authors: Jessica M. Torres, Christopher M Stafford, Bryan D. Vogt
Abstract: In this work, we will employ this wrinkling metrology to extract the modulus of polymer thin films for a homologous series of poly(n-alkyl methacrylate)s. In particular, we take advantage of the decrease in Tg as the alkyl chain length increases for ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900945

306. Effect of specimen orientation and extrusion welds on the fatigue life of an AA6063 alloy
Topic: Materials Science
Published: 2/13/2009
Author: Nicholas Nanninga
Abstract: The effect of specimen orientation and extrusion seam welds on the fatigue life of specimens milled from a hollow AA6063 alloy extrusion profile have been characterized in the form of S-N curves. The fatigue behavior of the fully recrystallized AA60 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901721

307. ADVANCED NON-DESTRUCTIVE HYDROGEN SENSORS TO PREVENT MATERIAL DEGRADATION FROM HYDROGEN DAMAGE
Topic: Materials Science
Published: 1/5/2009
Authors: Angelique N Lasseigne, Kamalu Koenig, David Olson, Brajendra Mishra, Joshua Jackson, Thomas Allen Siewert, Joseph David McColskey
Abstract: New higher strength pipeline steels (X100 and X120) exhibit lower tolerance for hydrogen (diffusible and formed hydrides) before significant degradation or failure occurs. It is essential to have advanced sensors to monitor the hydrogen content and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854112

308. Adhesive bonding to dentin improved by polymerizable cyclodextrin derivatives
Series: Journal of Research (NIST JRES)
Topic: Materials Science
Published: 1/5/2009
Authors: Rafael L. Bowen, Gary Edward Schumacher, Anthony Albert Giuseppetti, Kathleen M. Flynn, Charles Martin Guttman, Clifton M. Carey
Abstract: Objectives. Determine bonding characteristics of a hydrophilic monomer formulation containing PCDs (Polymerizable Cyclodextrin Derivatives). The hypothesis was that a formulation containing hydrophilic cross-linking diluent comonomers and PCD molecul ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854114

309. Inducing analytical orthogonality in tungsten oxide-based microsensors using materials structure and dynamic temperature control
Topic: Materials Science
Published: 1/4/2009
Authors: Kurt D Benkstein, Baranidharan Raman, David L. Lahr, John E Bonevich, Stephen Semancik
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902372

310. Comparison of Wavelet Transform and Choi-Williams Distribution to Determine Group Velocities for Different Acoustic Emission Sensors
Topic: Materials Science
Published: 12/31/2008
Author: Marvin Arnold Hamstad
Abstract: Acoustic emission (AE) sources in a plate generate dispersive Lamb waves. In this research, pencil lead breaks (PLBs) were made on an edge of a 3.1 mm thick aluminum alloy plate to generate such AE waves. The PLBs were made near the plate midplane an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901059



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