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Displaying 3601 - 3625 of 74066

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

Shape of Hollow Dislocation Cores: Elastic and Anisotropic Surface Energy Effects

October 12, 2021
Author(s)
David J. Srolovitz, N Sridhar, J P. Hirth, John W. Cahn
Evidence for the existence of hollow core dislocations has existed for nearly forty years. Such hollow cores are often found in growth spirals associated with screw dislocations. Examples of this type of morphology may be found in silicon carbide, copper

Simulating Thermal Response of EB-PVD Thermal Barrier Coating Microstructures

October 12, 2021
Author(s)
M Bartsch, U Schulz, J M. Dorvaux, O Lavigne, Lin-Sien H. Lum, Stephen A. Langer
As ceramic thermal barrier coatings (TBC) are used in more critical applications in advanced engines, knowing basic physiproperties of TBC's is essential for design and reliability assessment. In particular, knowledge of thermal conductivity is cruciin

Simulation of a Single Asperity Impacts at Head-Disk Interface

October 12, 2021
Author(s)
Tze J. Chuang, Stephen M. Hsu
During the track accessing mode of a hard disk drive, the flying height of the slider over the disk surface becomes smaller and smaller as the demand in data storage a real density increases. As a result, the propensity of glide avalanche is bound to

SiO 2 /Si 3 N 4 /A1 2 O 3 Stacks on Silicon for Scaled-Down Memory Devices: Effects of Interfaces and Thermal Annealing

October 12, 2021
Author(s)
M Lisiansky, A Heiman, M Kovler, Y Roizin, Igor Levin, A Gladkikh, M Oksman, R Edrei, A A. Hofman, Y Shnieder, T Claasen
Effects of interfaces and thermal annealing on the electrical performance of the SiO2/Si3N4/A12O3 (ONA) stacks in non-volatile memory devices were investigated. Structural and electrical characterization demonstrated the principal role of the Si3N4/A12O3

Sixth Annual Report on Federal Agency Use of Voluntary Consensus Standards

October 12, 2021
Author(s)
K L. McIntyre, M B. Moore
Document is the Annual Report on Federal Agency Use of Voluntary Consensus Standards required to be submitted by NIST the office of Management Budget (OMB) under the National Technology Transfer and Advancement Act and OMB Circular A-119. It contains a

Small Angle Neutron Scattering Measurement of Silicon Nanoparticle Size Distribution

October 12, 2021
Author(s)
Jonghoon Choi, Shih-Huang Tung, Nam S. Wang, Vytas Reipa
We have determined the particle size distribution profiles of octane terminated silicon nanoparticle suspensions, produced using the sonication of electrochemically etched Si wafer. Small angle neutron scattering data was analyzed separately in the high (0

Soft X-Ray Fluorescence Studies of Solids

October 12, 2021
Author(s)
J A. Carlisle, Steven R. Blankenship, R N. Smith, Eric L. Shirley, L J. Terminello, J J. Jia, T A. Callcott, D L. Ederer
Resonant inelastic x-ray scattering (RIXS) has been observed in many systems above and below their core threshold. Below threshold, inelastic-loss features are observed, which disperse linearly with excitation energy, but as the excitation increases above

Software Specifications for Build LCC

October 12, 2021
Author(s)
M A. Ehlen, S Fuller
The report provides a list of guidelines for integrating two software programs that are extensively used by agencies of the federal government to evaluate the cost effectiveness of building-related investments, mainly for energy and water conservation

Solidus Phase Relationships in the AO-Al 2 O 3 -Nb 2 O 5 (A = Ca, Sr) Systems

October 12, 2021
Author(s)
Julia Y. Chan, Wilma Feb-Ayala, L D. Rotter, Igor Levin, Richard G. Geyer
Dielectric ceramics for wireless communications exhibiting modest permittivity, high quality factor (Q), and near-zero temperature coefficient are needed for high frequency, high power applications. Efforts are in progress to replace Ta 2O 5-based ceramics

Soluble Amyloid [Beta] Oligomers Affect Dielectric Properties by Membrane Incorporation and Domain Formation: Implications for Cell Toxicity

October 12, 2021
Author(s)
G Valinius, K F. Heinrich, R Budvytye, David J. Vanderah, Y Sokolov, J Hall, M Losche
Water-soluble prefibrillar amyloid b (Ab1 42) oligomers affect model bilayers by greatly reducing the membrane barrier to ion transport, as previously reported for Ab in many papers. However, important signatures of the molecular transport mechanism are
Displaying 3601 - 3625 of 74066