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Displaying 38951 - 38975 of 73461

Color Measurements for Pearlescent Coatings

February 1, 2004
Author(s)
Maria E. Nadal, E A. Early
This paper describes recent developments at the National Institution of Standards and Technology in the colorimetric characterization of pearlescent coatings. The goal of this research is to develop a measurement protocol for the accurate color

Combinatorial Techniques to Measure Curing of Epoxy Films

February 1, 2004
Author(s)
Aaron M. Forster, D Ragahavan, Naomi Eidelman, Alamgir Karim
Combinatorial methods were implemented in the investigation of time and temperature effects on epoxy curing by using three complementary techniques: axisymmetric adhesion testing, FT-IR reflectance mapping, and confocal fluorescence mapping to characterize

Computer Modeling of Crack Propagation in Biaxially-Stressed Glass Disks

February 1, 2004
Author(s)
George W. Quinn, Dianne M. O'Leary, Janet Quinn
A computer program was written to model the propagation of two-dimensional traveling cracks in a biaxially-stressed glass disk. This was accomplished by using a combination of known fractographic equations and empirical observations with generic algorithms

Controlling The Growth Direction of ZnO Nanowires (NWs) on c and a -Plane Sapphire

February 1, 2004
Author(s)
Babak Nikoobakht, Albert Davydov, Stephan J. Stranick
The issue of controlling the growth direction of NWs is vital in nanotechnology applications and future optoelectronic devices. In an effort to address the above, we have begun studies aimed at selectively controlling the growth direction of horizontal

Coupling Efficiencies in Single-Photon On-Demand Sources

February 1, 2004
Author(s)
Stefania Castelletto, Ivo P. Degiovanni, M J. Ware, Alan L. Migdall
Many quantum computation and communication schemes require, or would significantly benefit from, true sources of single photon on-demand (SPOD). Unfortunately, such sources do not exist. It is becoming increasingly clear that coupling photons out of a SPOD

Damage Modes in Dental Crown Multilayer Structures

February 1, 2004
Author(s)
Yu Zhang, Y N. Deng, Brian R. Lawn
The full potential of esthetic ceramic-based dental restorations has not yet been realized. Processing and surgical induced damage, exacerbated by fatigue damage during normal chewing, can reduce the initial strength of inherently brittle materials. The

Development of a Combinatorial Rheometer for Polymer Formulations

February 1, 2004
Author(s)
H J. Walls, Robert F. Berg, Kathryn L. Beers, Eric J. Amis
Finding the best formulation for a new application, or fine-tuning an existing formulation to meet various customer needs, requires extensive sample preparation and testing. Our goal is to make this exploration more efficient for the property of viscosity

DOM Test Suite Methodology

February 1, 2004
Author(s)
D Dimiradis
Our results extending Kuhn's fault class hierarchy provide a justification for the focus of fault-based testing strategies on detecting particular faults and ignoring others. We develop a novel analytical technique that allows us to elegantly prove that

Dynamical Adhesion Force of Cells on Biomaterial Substrates

February 1, 2004
Author(s)
Y N. Deng, Carl Simon Jr., P M. McGuiggan, Sheldon M. Wiederhorn, Brian R. Lawn
The adhesion of cells to synthetic biomaterial implant surfaces is an essential step for tissue growth in bone repair. Such adhesion can mandate whether the tissue will accept or reject the implanted biomaterials. In this study, the adhesion forces between

Effects of Materials Chemistry and Morphology on Conductometric Sensor Signals

February 1, 2004
Author(s)
Douglas C. Meier, Stephen Semancik
Observation of conductance changes in material films upon their interactions with gas phase molecules is the basis of operation of the chemical microsensors being developed in the Chemical Sciences and Technology Laboratory at NIST. These interactions are

Elastic Flow Instability, Curved Streamlines and Mixing in Microfluidic Flows

February 1, 2004
Author(s)
Jai A. Pathak, David J. Ross, Kalman D. Migler
Flow instabilities are well known to occur in macroscopic flows when elastic fluids flow along curved streamlines. In this work we use flow visualization to study the mechanism underlying a purely elastic flow instability for Poiseuille flow in a micro (m)

Electronics Interconnections for Extreme Environments

February 1, 2004
Author(s)
George G. Harman
This article discusses the requirements for wire-bond and flip-chip interconnections that can be used in packaging semiconductor devices for extreme high and low temperature environments [from +460 'C (HTE) down to -200 'C (LTE)]. Active devices capable of

Engineering the Electrochromism of Layer-by-Layer Assembled Films

February 1, 2004
Author(s)
Dean M. DeLongchamp, P T. Hammond
This work applies the processing technique of layer-by-layer (LBL) assembly to the creation and development of new electrochemically-active composites. Layer-by-layer assembly is a type of assisted self-assembly that can create macromolecular complex films

Face Recognition Vendor Test 2002 Supplemental Report

February 1, 2004
Author(s)
Patrick J. Grother
Further analyses of the systems tested in the Face Recognition Vendor Test 2002 are reported. These supplement those covered in the primary Evaluation Report of March 2003. Specifically this report is intended to appeal to a more specialized audience; it
Displaying 38951 - 38975 of 73461
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