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Displaying 326 - 350 of 2634

Comparison of Tensile Creep Measurements on Buttonhead and Pin-Loaded Specimens of Some Silicon Nitride Ceramics

February 19, 2017

Author(s)

Ralph Krause

Tensile-creep measurements by two experimental techniques on two kinds of silicon nitride ceramics were compared statistically. Some of the measurements were obtained from published investigations conducted elsewhere. One technique uses buttonhead

Comparison of Two Methods for Determining Surface Roughness From Spectrophotometry Data

February 19, 2017

Author(s)

L D. Rotter

The method of determining the surface roughness of a transparent solid interface by fitting spectrophotometric transmittance and/or reflectance data with a function that models the surface roughness as an effective medium layer is compared with scalar

Competing Fracture Modes in Brittle Materials Subject to Concentrated Cyclic Loading in Liquid Environments: Bilayer Structures

February 19, 2017

Author(s)

Yu Zhang, Sanjit Bhowmick, Brian R. Lawn

A preceding study of the competition between fracture modes in monolithic brittle materials in cyclic loading with curved indenters in liquid environments is here extended to brittle layers on compliant substrates. The fracture modes include outer and

Contact Area Correction for Random Surface Roughness on Nanoadhesion

February 19, 2017

Author(s)

Seung H. Yang, Huan Zhang, Stephen M. Hsu

Atomic force microscopes (AFM) have been used to measure adhesion at nanoscale between two surfaces. Colloidal probes are often utilized for such measurements because they provide much lower contact pressures and controlled contact geometry, facilitating

Contact Damage Produced in Si and MgO by Nanoindentation

February 19, 2017

Author(s)

B Hockey

TEM has been used to characterize the defect structures produced in Si and Mgo by Berkovich indentation at loads ranging from 0.1 mN to 5 mN. Plane-section observations are used to describe the nature of the defects and their spatial distribution about the

Control of Nanophase Defects During Ceramic Melt Processing of Bi2Sr2CaCu2O8+x High Tc Superconductors

February 19, 2017

Author(s)

T J. Haugan, Winnie Wong-Ng, Lawrence P. Cook, H J. Brown, L Swartzendruber

To improve the critical current density of Bi 2Sr 2CaCu 2O 8+x high temperature superconductors (HTS) in high magnetic field applications (> 1 T from 20 K to 50 K), it is necessary to introduce a high density (approximately equal to} 5 per 100 nm in a

Controlled Synthesis of Single-Crystalline InN Nanorods

February 19, 2017

Author(s)

Igor Levin, Albert Davydov, O M. Kryliouk, Hyun Jong Park, YongSun Won, T J. Anderson, J P. Kim, J A. Freitas

Single-crystalline InN nanorods were successfully grown on c-Al203, GaN, and Si substrates by non catalytic, template-free hydride metal-organic vapor phase epitaxy (H-MOVPE). Stable gas-phase oligomer formation is proposed as the nucleation mechanism for

Coupling Between Octahedral Tilting and Ferroelectric Order in Tetragonal Tungsten Bronze-Structured Dielectrics

February 19, 2017

Author(s)

Igor Levin, M Stennett, D I. Woodward, A R. West, I Reaney

Strong coupling between local polar displacements and a commensurate octahedral tilting is proposed to explain the onset of classic ferroelectric behavior in tetragonal tungsten bronze-like dielectrics BaLaxNd1-xNb3Ti2O15. The ferroelectric phase

Crystal Chemistry and Microwave Dielectric Properties of Ba 3 Mnb 2-x Sb x O 9 (M=Mg, NI, Zn)

February 19, 2017

Author(s)

M W. Lufaso, E Hopkins, S M. Bell, A Llobet

The effect of Sb5+ substitution on the crystal chemistry and dielectric properties of Ba3MNb2-xSbxO9 (M = Mg, Zn, Ni) was investigated using a combination of X-ray and neutron powder diffraction, and dielectric property measurements at microwave

Crystal Structures, Modeling, and Dielectric Property Relationships of 2:1 Ordered Ba3MM 2O9 (M = Mg, Ni, Zn; M = Nb, Ta) Perovskites

February 19, 2017

Author(s)

M W. Lufaso

The preparation, modeled and refined crystal structures, and structure-dielectric property relationships of five Ba3MM 2O9 (M = Mg, Ni, Zn; M = Nb, Ta) perovskites are reported. Crystal structure modeling was used to generate initial structure models for

Crystallographic Data Sources

February 19, 2017

Author(s)

Vicky L. Karen

Crystallography has a long and successful history of self-organization and was one of the first areas to create numerical scientific databases. Virtually all structure determinations have been archived in databases that allow ready access and complete

Crystallography and Crystal Chemistry of (Ba 1-x Sr x )2TiO 4

February 19, 2017

Author(s)

Winnie Wong-Ng, James A. Kaduk, Debra L. Kaiser, Julia Frank

This paper reports an investigation of the homogeneity range, crystal chemistry and crystallography of a technologically-important (Ba2-xSrx)TiO4 solid solution series. Since the end members of the series - Ba2TiO4 (Pnma (No.62)) and Sr2TiO4 (I4/mmm (No

Data and Informatics Needs in Biomaterials

February 19, 2017

Author(s)

C P. Sturrock

Biomaterials are nonviable materials used in medical devices, that are intended to interact with biological systems. In 2002 the total U.S. Medical device market stood at $77 billion, with global sales estimated at 2-3 times this figure. Approximately 40

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