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Materials

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Displaying 2226 - 2250 of 2366

Materials reliability Division FY 2004 Programs and Accomplishments

September 1, 2004

Author(s)

Alan F. Clark

The Materials Reliability Division mission is to develop and disseminate measurement methods and standards enhancing the quality and reliability of materials for industry. We have changed our portfolio of research projects slightly this past year, as we

High-frequency ultrasound characterization of pulmonary arterial wall under normoxic and hypoxic conditions

August 23, 2004

Author(s)

Kendall Waters

Diagnosis of secondary pediatric pulmonary hypertension is often difficult because no single test permits complete evaluation. Improved understanding of the effects of hypertension on ultrasonic (US) properties of the pulmonary arterial (PA) wall could

Continuum Dyson's Equation and Defect Green's Function in a Heterogeneous Anisotropic Solid

July 1, 2004

Author(s)

B Yang, Vinod Tewary

Continuum Dyson's equation and defect Green's function (GF) in a heterogeneous, anisotropic and linearly elastic solid under homogeneous boundary conditions have been introduced. The continuum Dyson's equation relates the point-force Green's responses of

Phase Relations, Crystal Chemistry, and Dielectric Properties in Sections of the La 2 O 3 -CaO- MgO-TiO 2 System

June 1, 2004

Author(s)

Terrell A. Vanderah, V L. Miller, Igor Levin, S M. Bell, T Negas

Subsolidus phase equilibria, crystal chemistry, and dielectric behavior were studied for the La 2O 3 MgO TiO 2 system and for the ternary sections LaMg 1/2Ti 1/2O 3 CaTiO 3 La 2O 3 and LaMg 1/2Ti 1/2O 3 CaTiO 3 0.5La 2/3TiO 3 in the quaternary La 2O 3 CaO

Shear-Induced Structure in Polymer-Clay Nanocomposite Solutions

June 1, 2004

Author(s)

Sheng Lin-Gibson, H W. Kim, G Schmidt, Charles C. Han, Erik K. Hobbie

Abstract: The equilibrium structure and shear response of model polymer-clay nanocomposite gels are measured using X-ray scattering, light scattering, optical microscopy, and rheometry. The suspensions form physical gels via the bridging of neighboring

Stresses in shape memory polymer-matrix nanocomposites for biomedical applications

June 1, 2004

Author(s)

Davor Balzar, G Stefanic, Kenneth Gall, Martin Dunn, Yiping Liu

We report on the residual stresses in amorphous shape memory polymers reinforced with SiC particles. After 50 % compression of the composite material at 25 ¿C, the SiC particles exhibit a compressive stress, which is almost completely released during

Multiscale Green's-Function Method for Modeling Point Defects and Extended Defects in Anisotropic Solids: Application to a Vacancy and Free Surface in Copper

March 1, 2004

Author(s)

Vinod K. Tewary

A multiscale Green's function method is described for modeling of point defects such as vacancies and interstitals together with extended defects such as free surfaces and interfaces in a general anisotropic solid. The method treats the point defects at

Force-deflection characterization of individual carbon nanotubes attached to MEMS devices

January 25, 2004

Author(s)

M Hartman, Paul Rice, Dudley Finch, G. D. Skidmore, Victor M. Bright

Results are presented for in-situ manipulation, attachment, and mechanical testing of individual carbon nanotubes (CNTs) on MEMS devices. Nanotubes positioned onto polysilicon structures were permanently attached by electron beam deposition (EBD) "welding"

Surface Chemistry and Structure of Purified, Ozonzied, Multiwalled Carbon Nanotubes Probed by NEXAFS and Vibrational Spectroscopies

January 13, 2004

Author(s)

S Banerjee, T Hemraj-Benny, Mahalingam Balasubramanian, Daniel A. Fischer, J A. Misewich, S S. Wong

In-situ Soft X-ray Studies of Toluene Catalytic Oxidation on the Pt(111) Surface

January 5, 2004

Author(s)

A L. Marsh, D J. Burnette, Daniel A. Fischer, J L. Gland

The catalytic oxidation of toluene on the Pt(111) surface has been characterized, in flowing oxygen pressures up to 1.33 Pa, using fluorescence yield near-edge spectroscopy (FYNES). During temperature-programmed (TP-FYNES) oxidationexperiments in flowing

Monte-Carlo Simulation for the Fracture Process And Energy Release Rate of Unidirectional Carbon Fiber-Reinforced Polymers at Different Temperatures

January 1, 2004

Author(s)

X Wang, Martin Chiang, Chad R. Snyder

Residual stress determination by diffraction: Modeling and applications

January 1, 2004

Author(s)

Davor Balzar, N C. Popa

Residual stress plays an important role in shaping Iilaterials properties. We present both the method to determine texture-weighted strain orientation distribution function for arbitrary crystal and sample symmetries and an example of the determination of

Nanometrology - FY 2003 Program and Selected Accomplishments

December 15, 2003

Author(s)

Clare M. Allocca, Stephen W. Freiman

The emphasis on nanotechnology around the world is leading to the development and commercialization of unique products based upon significantly smaller devices and material ensembles. Materials at the nanoscale in three dimensions (NEMS, MEMS), two

Orientation of Platelets in Multilayered Nanocomposite Polymer Films

December 1, 2003

Author(s)

M M. Malwitz, Sheng Lin-Gibson, Erik K. Hobbie, Paul Butler, G Schmidt

The orientation of platelets in micron thick polymer-clay nanocomposite films was investigated by means of small-angle neutron scattering (SANS), small angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD). The films with various clay

Interaction Between Matrix Cracks in E-Glass/Epoxy 2 Dimensional Multi-Fiber Array Model Composites

November 15, 2003

Author(s)

Gale A. Holmes, Walter G. McDonough, Joy P. Dunkers, Charles C. Han

The interaction between fiber breaks in an E-Glass/Epoxy 2-D multifiber array that form matrix cracks during fiber fracture is presented. In contrast to the theoretical predictions of Hedgepeth and van Dyke (1967) the failure sites in fibers adjacent to a

Elastic Constants of Layers in Isotropic Laminates

November 1, 2003

Author(s)

F Hayliger, H M. Ledbetter, Sudook A. Kim, Ivar E. Reimanis

We determined the individual laminae elastic constants in multilayer laminates composed of dissimilar isotropic layers using acoustic resonance spectroscopy and the linear theory of elasticity. Resonant ultrasound allows one to measure the free-vibration

First-Principles Calculations of the Dielectric Properties of Perovskite-Type Materials

November 1, 2003

Author(s)

Eric J. Cockayne

We compare first-principles (FP) calculations of the ionic effective charges, phonon frequencies, and static dielectric permittivities k s of several perovskite-type materials. Transition metal ions have anomalously large effective charges, though in the

The 2002 Materials Research Society (MRS) Fall Meeting report

October 17, 2003

Author(s)

Winnie K. Wong-Ng

Following tradition, the 2002 Materials Research Society (MRS) annual meeting again took place from in Boston Copely Plaza from December 1 to 6 (in the spacious Hynes Convention Center). Attending the Boston MRS Fall meeting, for many attendees, has also

Combinatorial Chemistry

October 13, 2003

Author(s)

J D. Hewes, Debra L. Kaiser, Alamgir Karim, Eric J. Amis

In 1995, the rapid fabrication of tens, hundreds, and, eventually, tens of thousands of samples in two-dimensional arrays of discrete microscaled samples (pixels) using lithography methods developed for the electronics industry was reported. Importantly

Elastic Stiffnesses, Debye Temperatures, and T c in Cuprates

September 1, 2003

Author(s)

H M. Ledbetter, K Sudook

For cuprate superconductors and related oxides, we review some aspects of their elastic constants. We consider the systematics of the bulk-modulus/atomic-volume (B/V a) relationship. For nonsuperconducting oxides, the B-V a diagram shows that most oxides

Elastic Constants of Natural Quartz

August 1, 2003

Author(s)

Paul R. Heyliger, H M. Ledbetter, Sudook A. Kim

We measured the elastic constants of a natural-quartz sphere using resonance-ultrasound spectroscopy (RUS). Our measurements of the near-traction-free vibrational frequencies of the sphere are matched with the predicted frequencies from the dynamic theory

A Superconducting Microwave Power Limiter for Protection of High-Performance Superconducting Electronics

July 11, 2003

Author(s)

James Booth, Kenneth Leong, Susan A. Schima

We report on the development of a microwave power limiter based on high temperature superconductor technology. The power limiter takes the form of a 50 Ω coplanar waveguide transmission line that can be reversibly driven into the normal state as microwave

Kinetic Inductance Contributions to the Nonlinear Response of Superconductors at Microwave Frequencies

July 11, 2003

Author(s)

James Booth, Kenneth Leong, Susan A. Schima

We demonstrate how nonlinear effects in high temperature superconducting thin films can be quantified based on a current-dependent penetration depth λ(J). Using an assumed form for λ(J), we calculate the expected third-order harmonic signals generated by

Formation of a Surface Quantum Dot Near Laterally and Vertically Neighboring Dots

July 1, 2003

Author(s)

B Yang, Vinod Tewary

Elastic energy release rate (EERR) of a surface quantum dot (QD) near laterally and vertically neighboring seed QDs in a linear anisotropic elastic substrate iscalculated. An efficient boundary element method is used to solve the three-dimensional boundary

The Influence of Silane Coupling Agent Composition on the Surface Characterization of Fiber and on Fiber-Matrix Interfacial Shear Strength

July 1, 2003

Author(s)

E Feresenbet, Gale A. Holmes, D T. Raghavan

Epoxy resins are widely used as the matrix material for fiber reinforced composites in aircrafts, automobiles, ships and housing. Most of the reinforcement in epoxy composite is glass fiber so as to lower the cost. Studies in the past have suggested that

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