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Journals

The Upper Critical Magnetic Field of a Superconductor as a Function of Disorder

October 16, 2008

Author(s)

Robert J. Soulen, M. S. Osofsky, G T. Woods, William F. Egelhoff Jr.

We have observed a dramatic enhancement of H c2 in the system, Nb 1-x Si x, as a function of disorder. To account for these empirical results, we incorporate...

Complementary Experimental Techniques for Multi-Scale Modeling of Plasticity

October 16, 2008

Author(s)

Lyle E. Levine, Gabrielle G. Long, David R. Black

Some recently-developed experimental techniques, such as in situ ultra-small-angle X-ray scattering (USAXS), have demonstrated a capability for measuring...

Characterization of Temperature-Sensitive Hydrogels Based on N-Isopropylacrylamide and Novel Crosslinkers

October 16, 2008

Author(s)

Michael Weir, Joseph M. Antonucci, Francis W. Wang

This paper describes the use of new types of synthesized hydroxylated dimethacrylate monomers as crosslinkers for thermally-sensitive hydrogel networks with...

High-Throughput Methods to Assay Cell Shape and Response on Topographically Patterned Surfaces

October 16, 2008

Author(s)

S L. Kennedy, N Washburn, A Sehgal, Alamgir Karim, Eric J. Amis

Numerous groups have demonstrated that cell alignment, cell spreading and cell proliferation can be controlled by various topographical features. There are...

Covalent Surface Chemistry Gradients for Presenting Bioactive Peptides

October 16, 2008

Author(s)

Matt J. Kipper, Hynda K. Kleinman, Francis W. Wang

The activation of surfaces by covalent attachment of bioactive moieties is an important strategy for improving the performance of biomedical materials. Such...

A Hybrid, Quantum-Classical Approach for the Computation of Dislocation Properties in Real Materials: Method, Limitations and Applications

October 16, 2008

Author(s)

Francesca Tavazza, Lyle E. Levine, Anne M. Chaka

In this work we introduce a hybrid ab initio-classical simulation methodology designed to incorporate the chemistry into the description of phenomena that...

Wavelength--Shift Fluorescent Probes for Monitoring of Polymerization

October 16, 2008

Author(s)

Francis W. Wang, R E. Lowry

The feasibility of using wavelength-shift fluorescent probes for cure monitoring of an epoxy resin and an acrylic resin was evaluated. 4-(N,N-dihexylaminostyryl...

Roughness of Glass Surfaces Formed by Sub-Critical Crack Growth

October 16, 2008

Author(s)

Sheldon M. Wiederhorn, Jay S. Wallace, Jean-Pierre Guin, Theo Fett

Improved Modeling of Residual Strain/Stress and Crystallite-Size Distribution in Rietveld Refinement*

October 16, 2008

Author(s)

Davor Balzar, N Popa

We propose two improvements to the microstructural modeling in Rietveld refinement. The first is the model that yields the complete texture-weighted strain and...

Measurement and Interpretation of AC Susceptibility and Loss in High Temperature Superconductors

October 16, 2008

Author(s)

C C. Silva, M E. McHenry

Intrinsic and hysteretic AC losses were investigated in high temperature superconductors. AC susceptibility was measured as a function of magnetic field...

Detection of Pinholes in Magnetic Tunnel Junctions by Magnetic Coupling

October 16, 2008

Author(s)

Philip Pong, Cindi L. Dennis, Audie M. Castillo, Andrew P. Chen, William F. Egelhoff Jr.

Pinholes in tunnel barriers are detrimental to the performance of magnetic tunnel junctions (MTJ) since they create direct magnetic exchange coupling between...

The Influence of Ceramic Interphases on the Creep Behavior of Silicon Nitride

October 16, 2008

Author(s)

Sheldon M. Wiederhorn

In this paper we discuss the role played by the intergranular phases in the creep of silicon nitride, which is completely controlled by the amount and effective...

Single-Crystal Plasticity: Statistical Physics and Experiments

October 16, 2008

Author(s)

Lyle E. Levine, R M. Thomson, M Savage, D E. Kramer, Y Shim

Although deformation usually appears to be a smooth process at the macroscopic scale, at smaller scales it is highly heterogeneous in both time and space, with...

Ultrasonic Measurement of Stress Using a Rotating EMAT

October 16, 2008

Author(s)

A V. Clark, C S. Hehman, Thao D. Nguyen

The acoustic birefringence method is primarilly used to measure differences of principal stresses in regions where principal stresses coincide with material...

Creep of Thin Film Au on Bimaterial Au/Si Microcantilevers

October 16, 2008

Author(s)

Dudley Finch

We examine creep in thin film Au to bimaterial Au/Si microcantilevers. Due to thermal expansion coefficient mismatch between the Au and Si layers, the...

Melting Equilibria of the BaF₂-CuO_x System

October 16, 2008

Author(s)

Winnie Wong-Ng, Lawrence P. Cook, J Suh

Since the BaF 2-CuO x system is a limiting binary of the overall quaternary reciprocal Ba,Y,Cu//F,O phase diagram, it provides an important frame of reference...

Friction and Adhesion Measurements Between a Florocarbon Surface and a Hydrocarbon Surface to Air

October 16, 2008

Author(s)

P M. McGuiggan

The friction and adhesion between a fluorocarbon monolayer-coated surface (FC) against a hydrocarbon monolayer-coated surface (HC) has been directly measured...

Effects of Dentin Conditioning on Bond Strengths and Interfacial Morphology

October 16, 2008

Author(s)

Sabine H. Dickens

Bonding to dentin is critically influenced by the age and mineral content and the iatrogenic state of the dentin. The latter is affected by altering the smear...

Crystal Asymmetry Induces Single-Atom Chain Formation in Gold Nanowires

October 16, 2008

Author(s)

Francesca Tavazza, A Hasmy, Lyle E. Levine, Anne M. Chaka, Luis C. Rincon, M Marquez, Carlos A. Gonzalez

We performed density functional theory and tight-binding molecular dynamics calculations to investigate the formation of suspended linear atom chains when...

X-Ray Microbeam Measurements of Individual Dislocation Cell Elastic Strains in Deformed Single Crystal Copper

October 16, 2008

Author(s)

Lyle E. Levine, B C. Larson, W Yang, M E. Kassner, J Z. Tischier, M A. Delos-Reyes, Richard J. Fields

The distribution of elastic strains (and thus stresses) at the sub-micrometer length scale within deformed metal single crystals has surprisingly broad...

Characterization of Nanoporous Low-K Thin Films by SANS Contrast Variation

October 16, 2008

Author(s)

R C. Hedden, Hae-Jeong Lee, Barry J. Bauer

Small-angle neutron scattering (SANS) contrast variation is applied to characterization of nanoporous low-dielectric constant (low-k) thin films. Films are...

An In Vitro Model for Studying Bioresorption Rate of Calcium Phosphate Bone Graft Materials

October 16, 2008

Author(s)

Laurence C. Chow, Shozo Takagi, Milenko Markovic

It has been postulated that the in vivo resorption rates of calcium phosphate bone graft materials are closely related to their dissolution rates in...

On the Existence and Stability of Quadrijunctions

October 16, 2008

Author(s)

John W. Cahn, E S. Vanleck

The existence and stability of various microstructural features for two-phase materials with anisotropic energies is discussed. In particular, the existence of...

Deformation of Heterogeneous Adaptive Composite

October 16, 2008

Author(s)

Julia Slutsker, Alexander L. Roytburd

The superelastic deformation of an adaptive layer composite containing a shape memory alloy as an active component is considered in this paper. It is shown that...

An Approach for Assessing Total Cellular DNA Damage

October 16, 2008

Author(s)

Marc Roy

The capability to relate phenotypic effects with damage associated with either of the two genomes is especially useful under a number of circumstances...

AFM Observations of Slip Band Development in AI Single Crystals

October 16, 2008

Author(s)

D E. Kramer, M Savage, Lyle E. Levine

In situ atomic force microscopy (AFM) is used to observe the structure and evolution of slip bands on the surface of plastically deformed aluminum single...

Internal Friction Tensor in Langasite (LA₃Ga₅SiO₁₄)

October 16, 2008

Author(s)

H M. Ledbetter, Sudook A. Kim

Using acoustic spectroscopy, we measured the complete elastic-constant and internal-friction tensor C y = C y (1+Q -1 y) of langasite, a trigonal-symmetry...

The Flow Induced Structure in a Thermotropic Liquid Crystalline Polymer as Studied by SANS

October 16, 2008

Author(s)

M D. Dadmun, S Clingman, Christopher K. Ober, A Nakatani

Small angle neutron scattering is utilized to determine the flow induced alignment of a model thermotropic liquid crystalline polymer (LCP) as a function of...

Colocalization of Cell Adhesion Proteins on 3D Tissue Engineering Scaffolds Fabricated by Rapid Prototyping

October 16, 2008

Author(s)

Tithi Dutta Roy, J J. Stone, Wei Sun, E H. Cho, S J. Lockett, Francis W. Wang, Lori Henderson

Not many groups have examined expression of cell adhesion molecules in 3D polymeric scaffolds compared to two-dimensional (2D) surfaces. In this investigation...

Experimental Observations of Evolving Yield Loci in Biaxially Strained AA 5754-O

October 16, 2008

Author(s)

Mark Iadicola, Timothy J. Foecke, Stephen W. Banovic

Experimental measurement of the plastic biaxial mechanical response for an aluminum alloy (AA 5754-O) sheet metal is presented. Traditional methods of...

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