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Displaying 52126 - 52150 of 73697

Damage Modes in Dental Layer Structures

March 7, 1998
Author(s)
Yeon-Gil G. Jung, S Wuttiphan, I M. Peterson, Brian R. Lawn
A study is made of crack patterns in two model coating/substrate bilayer systems conceived to simulate crown and tooth structures, at opposite extremes of elastic/plastic mismatch: porcelain on glass-infiltrated alumina (soft/hard); and glass-ceramic on

Cement Hydration in the Presence of Municipal Solid Waste Incineration Fly Ash.

March 5, 1998
Author(s)
Dale P. Bentz, S Remond, P Pimienta, J P. Bournazel
Incorporating wastes into concrete on an appropriately selective basis could help to solve some of the problems encountered in waste management. Some industrial by-products (fly ash and slag for example) have been used in the manufacture of cement and

Dual wavelength, 980 nm-pumped, Er/Yb-codoped waveguide laser in Ti:LiNbO 3

March 5, 1998
Author(s)
J. Amin, J. A. Aust, D. L. Veasey, Norman Sanford
The authors demonstrate the first Er/Yb codoped waveguide laser in Ti:LiNbO 3. The device was fabricated on x-cut LiNbO 3 with the guides parallel to the x-axis resulting in reduced photorefractive damage and allowing 980nm pumping. Laser operation is

Modeling of Multi-Step Nonlinear Stress Relaxation in DGEBA/M-PDA Epoxy Resins

March 4, 1998
Author(s)
Gale A. Holmes, R C. Peterson, Donald L. Hunston
Multi-step stress relaxation data from a DGEBA/m-PDA epoxy resin is modeled using a nonseparable nonlinear constitutive equation. The form of the equation is based on nonlinear concepts and ideas developed in melt rheology. Although time-strain

On the Bifurcation from Continuous to Segmented Chip Formation in Metal Cutting

March 4, 1998
Author(s)
Timothy J. Burns, Christopher J. Evans, Matthew A. Davies
We describe a new approach to modeling chip formation in orthogonal machining. Metal cutting is interpreted as a nonlinear dynamical process with thermomechanical feedback, which is similar in many ways to an open chemical reactor. As the cutting speed is

Interconnection Continuity Test for Packaged Functional Modules

March 3, 1998
Author(s)
Jan Obrzut
We developed an electrical test to evaluate interconnections in packaged, electrostatic-discharge (ESD) protected modules. The ESD protection circuit, which in modern integrated circuits is present at every I/O as an inherent part of the chip structure

Accurate Ab Initio Calculation of Molecular Constants

March 1, 1998
Author(s)
Svetlana A. Kotochigova, I Tupitsyn
The valence bond method and advanced computational technique are used to perform all-electron ab initio calculations of the electronic structure of diatomic molecules. The basic idea behind the method is to expand the molecular wavefunction in terms of

Aircraft Cargo Area Fire Detection (NISTIR 6146)

March 1, 1998
Author(s)
D Blake, J O'Sullivan, S Hammann, M L. Kolleck, Thomas Cleary
Overviews of fire deteciton in aircraft cargo areas were presented by David Blake of the Federal Aviation Administration, John O'Sullivan of British Airways, Scott Hammann of Boeing Company, and Matt Koleck ofBooz-Allen & Hamilton. The breakout discussion

Analytical/Experimental Study of Vibration of a Room-Sized Airspring-Supported Slab

March 1, 1998
Author(s)
H Amick, B Sennewald, E C. Teague, Brian R. Scace
This paper reports the results of the finite element analysis and in-situ testing of a large-scale (4 m x 10 m) pneumatically isolated concrete slab are reported. The slab was constructed as a design prototype for next generation metrology laboratories at

Can a Pressure Standard be Based on Capacitance Measurements?

March 1, 1998
Author(s)
Michael R. Moldover
We consider the feasibility of basing a pressure standard on measurements of the dielectric constant [epsilon] and the thermodynamic temperature T of helium near )[degrees]C. The pressure P of the helium would be calculated using the fundamental constants

Cement Hydration in the Presence of Municipal Solid Waste Incineration of Fly Ash

March 1, 1998
Author(s)
S J. Remond, Dale P. Bentz, M. Pimpinella, J P. Bournazel
This study is part of a wider research program aimed at developing an assessment methodology of waste-containing concrete. This methodology is developed based on the study of mortars containing an experimental waste: MSWIFA (Municipal Solid Waste

Concrete: A Multi-Scale Interactive Composite

March 1, 1998
Author(s)
Edward J. Garboczi, Dale P. Bentz
Methods have been developed for predicting the overall diffusion coefficient of ions in concrete using a multi-scale interactive analysis, ignoring any chloride binding interactions. The analysis makes use of microstructure models of mortar/concrete and
Displaying 52126 - 52150 of 73697
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