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Displaying 7776 - 7800 of 143793

Ring-on-Ring Strength Measurements on Rectangular Glass Slides

October 12, 2021
Author(s)
Theo Fett, G Rizzi, J -. Guin, Sheldon M. Wiederhorn
The ring-on-ring test has been standardized and used extensively for strength measurements on glasses and ceramics. The specimen is especially useful to avoid edge defects that often dominate the failure of flexure bars. In this paper, we extend the

Robust Design of an Evolutionary Algorithm for Machining Optimization Problems

October 12, 2021
Author(s)
Jean-Louis Vigouroux, Laurent Deshayes, Sebti Foufou, James J. Filliben, Lawrence A. Welsch, Alkan Donmez
In this paper, a methodology for the robust design of an evolutionary algorithm is presented. The evolutionary algorithm (EA) is studied with the intention to solve machining optimization problems having highly non linear constraints and uncertainties. A

Role of Substrate Material in Failure of Crown-Like Layer Structures

October 12, 2021
Author(s)
Jeonghwan Kim, Sanjit Bhowmick, Herzl Chai, Brian R. Lawn
The role of substrate modulus on critical loads to initiate and propagate radial cracks to failure in curved brittle glass shells on compliant polymeric substrates is investigated. Flat glass disks are used to drive the crack system. This configuration is

Rotational Spectra, Nuclear Quadrupole Hyperfine Tensors, and Conformational Structures of the Mustard Gas Simulent Chloroethyl Ethyl Sulfide

October 12, 2021
Author(s)
M J. Tubergen, A Lesarri, R D. Suenram, A C. Samuels, J O. Jensen, M W. Ellzy, J M. Lochner
Rotational spectra have been recorded for both the 35Cl and 37Cl isotopes of two structural conformations of chloroethyl ethyl sulfide (CEES). The rotational constants of the 35Cl and 37Cl isotopomers were used to identify the conformations as GGT and TGT

Satellite Instrument Calibration for Measuring Global Climate Change

October 12, 2021
Author(s)
G Ohring, B Wielicki, R Spencer, W Emery, Raju V. Datla
Measuring the small changes associated with long-term global climate change from space is a daunting task. The satellite instruments must be capable of observing atmospheric temperature trends as small as 0.10 degrees C / decade, ozone changes as little as

Science for Stewardship: Multidisciplinary Research on the USS Arizona

October 12, 2021
Author(s)
Matthew A. Russell, L E. Murphy, D L. Johnson, Timothy J. Foecke, Pamela J. Morris, R Mitchell
The National park Service's Submerged Resources Center and USS Arizona Memorial are conducting and coordinating research directed at understanding the nature and rate of natural processes affecting the deterioration of the USS Arizona in Peal Harbor

Secondary Phase Evolution in Silicon Nitride During Creep and Heat Treatment

October 12, 2021
Author(s)
F Lofaj, H Gu, A Okada, Sheldon M. Wiederhorn, H Kawamoto
The microstructure of a ytterbia- and yttria-containing grade of silicon nitride, SN 88, was investigated after it had been annealed in nitrogen, in air and crept in air. We were particularly interested in phase transformation within the secondary silicate

Self-Assembled Multiferroic Nanostructures in CoFe 2 O 4- PbTiO 3 System

October 12, 2021
Author(s)
Jiying Li, Igor Levin, Julia Slutsker, Virgil Provenzano, Peter K. Schenck, J.H. Yang, Alexander L. Roytburd
The effect of substrate orientation of the morphologies of epitaxial self-assembled nanostructures was demonstrated using newly synthesized multiferroic 0.67PbTiO3-0.33CoFe2O4 nanocomposite thin films. The two-phase nanostructures were grown on single

Self-Organization of Self-Assembled Tetrameric Porphyrin Arrays on Surfaces

October 12, 2021
Author(s)
T Milic, Jayne C. Garno, T. Saab, G Smeureanu, J Batteas, Charles M. Drain
The incorporation of designed self-assembled supramolecular structures into devices requires deposition onto surfaces with retention of both structure and function. This remains a significant challenge and presents a barrier to developing devices with
Displaying 7776 - 7800 of 143793
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