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Topic Area: Materials Science

Displaying records 301 to 310 of 533 records.
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301. First-principles phase diagram calculations for the HfC-TiC, ZrC-TiC and HfC-ZrC solid solutions
Topic: Materials Science
Published: 12/10/2009
Authors: Benjamin P Burton, G. Steinle-Neumann, A, van de Walle
Abstract: We report first principles phase diagram calculations for the quasibinary systems HfC-TiC, TiC-ZrC and HfC-ZrC. Plane-wave pseudopotential methods were used to compute formation energies for superstructures of various bulk compositions, which were u ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902397

302. Generation of Monolayer Gradients in Surface Energy and Chemistry for Block Copolymer Thin Film Studies
Topic: Materials Science
Published: 12/1/2009
Authors: Julie N. L. Albert, Michael J. Baney, Christopher M Stafford, Jennifer Y. Kelly, Thomas H Epps
Abstract: We utilize an innovative vapor deposition set-up and cross-diffusion of functionalized chlorosilanes under dynamic vacuum to generate a linear gradient in surface energy and composition on a silicon substrate. The gradient can be tuned by manipulati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902680

303. A METHODOLOGY FOR DETECTING RESIDUAL PHOSPHORIC ACID IN POLYBENZOXAZOLE FIBERS
Topic: Materials Science
Published: 11/24/2009
Authors: Eun S. Park, John R Sieber, Charles Martin Guttman, Kirk D Rice, Kathleen M. Flynn, Stephanie S Watson, Gale Antrus Holmes
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902056

304. Early-Age Cracking Review: Mechanisms, Material Properties, and Mitigation Strategies
Topic: Materials Science
Published: 11/2/2009
Author: Dale P Bentz
Abstract: For the long term performance of concrete to be acceptable and predictable, in general, early-age cracking should be avoided. Improper design practices can contribute to early-age cracking, but for this review, it will be assumed that a correct desi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901945

305. Cost-effectiveness, Carbon Emissions, and Carbon Tax Implications of Energy Efficiency Measures in New Commercial Buildings.
Topic: Materials Science
Published: 11/1/2009
Authors: Joshua D Kneifel, Barbara C. Lippiatt
Abstract: Building energy efficiency has become a top priority due to the recent energy price spikes and increasing concern regarding climate change. New buildings are the easiest and least costly in which to increase energy efficiency, making new construction ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902101

306. Mineralogical and Microstructural Evolution Review
Topic: Materials Science
Published: 11/1/2009
Author: Kenneth Alan Snyder
Abstract: The mineralogical and microstructural changes that occur in cementitious systems during hydration are summarized. The discussion concentrates on changes that may occur in iso-thermal systems that do not interact with the environment. The discussion ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901944

307. High efficiency of natural lamellar remanent magnetisation in single grains of ilmeno-hematite calculated using Mössbauer spectroscopy
Topic: Materials Science
Published: 10/30/2009
Authors: Benjamin P Burton, S. McEnroe, C. McCammon, P. Robinson
Abstract: Single grains of ilmeno-hematite (titanohematite with ferri-ilmenite exsolution lamellae) approximately 250 µm in diameter were taken from Mid-Proterozoic metamorphic rocks in southwest Sweden and the Adirondack Mountains, USA, and were studied at ro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901408

308. Surface indentation arrays for high-throughput analysis of viscoelastic material properties
Topic: Materials Science
Published: 10/30/2009
Authors: Peter M. Johnson, Christopher M Stafford
Abstract: Viscoelastic relaxation processes factor into polymer performance and stability throughout an application lifetime. These relaxations are controlled by the polymer network structure and dynamics which occur at different orders of magnitude in time. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902859

309. Hydration kinetics and microstructure development of normal and CaCl2 accelerated tricalcium silicate pastes
Topic: Materials Science
Published: 10/26/2009
Authors: Andrew John Allen, Jeffrey J. Thomas, Hamlin M Jennings
Abstract: Microstructure development and the kinetics of hydration of pure tricalcium silicate (C3S) and CaCl2-accelerated C3S pastes were investigated by performing isothermal calorimetry and in situ small-angle neutron scattering (SANS) measurements on para ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903017

310. Artificial Intelligence Tools for Failure Event Data Management and Probability Risk Analysis for Failure Prevention
Topic: Materials Science
Published: 10/25/2009
Authors: Jeffrey T Fong, Pedro Vincente Marcal
Abstract: Over the last thirty years, much research has been done on the development of failure event databases and fatigue modeling of crack growth in pressure vessels and piping. According to a USNRC report (NUREG/CR6674, 2000), results of a fatigue crack g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903592



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