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Search Publications

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Displaying 45726 - 45750 of 73994

Permeability Prediction From Non-Destructive Imaging of Composite Microstructure

May 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., Kathleen M. Flynn, D P. Sanders, Richard~undefined~undefined~undefined~undefined~undefined Parnas
In this work, binary images of the microstructure of a unidirectional E-glass/epoxy composite were generated from the low contrast OCT data through image de-noising, contrast enhancement and feature recognition. The resulting data were input to a lattice

Prediction of Building Integrated Photovoltaic Cell Temperatures

May 1, 2001
Author(s)
Mark W. Davis, Arthur H. Fanney, Brian P. Dougherty
A barrier to the widespread application of building integrated photovoltaics (BIPV) is the lack of validated predictive performance tools. Architects and building owners need these tools in order to determine if the potential energy savings associated with

Radio-Frequency Metrology from NBS to NIST, The Legacy

May 1, 2001
Author(s)
Dennis S. Friday
We review a century of metrology research and development in the U.S. that paralleled the birth of radio/wireless and other electromagnetic field technologies. The interplay between the scientific and technological advances and the research, measurement

Radioactive Particle Analysis by Digital Autoradiography

May 1, 2001
Author(s)
Cynthia J. Zeissler, Richard M. Lindstrom, J P. McKinley
We have been exploring ways to evaluate the activity of radioactive particles that have been detected by phosphor plate digital autoradiography based on photostimulated luminescence (PSL). A PSL system with 25υ pixel digitization has been applied to

Reconfigurable Machine Controllers using the OMAC API

May 1, 2001
Author(s)
S Birla, D -. Faulkner, John L. Michaloski, S -. Sorenson, G Weinert, James H. Yen
With enterprises facing tremendous time-to-market pressures, manufacturing systems must be implemented quickly and modified easily. The ability of the open architecture approach to reconfigure or extend existing machine controllers to meet new needs is one

Registering 3D Point Clouds: An Experimental Evaluation

May 1, 2001
Author(s)
Christoph J. Witzgall, Geraldine Cheok
Four separate laser scans of a wooden box, taken from different vantage points, were examined in a laboratory setting. Visual and numerical registration methods, aimed at aligning the individual scan data with respect to a common frame, were explored. The

Reliable Solubility Data in the Age of Computerized Chemistry: Why, How and When?

May 1, 2001
Author(s)
J R. Rumble, Angela Y. Lee, D M. Blakeslee, S L. Young
Since 1979, International Union of Pure and Chemistry (IIUPAC) Commission V.8 on Solubility Data has published over 70 compilations of evaluated data on the solubility of gases in liquids, liquids in liquids, and solids in liquids. These volumes represent

Rotational Spectrum of Sarin

May 1, 2001
Author(s)
H Walker, R D. Suenram, A C. Samuels, J O. Jensen, M W. Ellzy, J M. Lochner, D Zeroka
To demostrate the possibilities of using molecular-beam Fourier-transform microwave spectroscopy as a measurement technique to unambiguously detect and monitor chemical warfare agents, we report the first observation and assignment of the rotational

Sensor Networking and Interface Standardization

May 1, 2001
Author(s)
Kang B. Lee
Sensors are used in various industries, ranging from aerospace, automotive, biomedicine, building, industrial automation, manufacturing, and process control to environmental monitoring. Traditionally, sensor outputs are analog signals, which are then fed

Sharp Interface Limit of a Phase-Field Model of Crystal Grains

May 1, 2001
Author(s)
A E. Lobkovsky, James A. Warren
We analyze a two-dimensional phase field model designed to describe the dynamics of crystalline grains. The phenomenological free energy is a function of a complex order parameter whose amplitude reflects the orientational order. Its phase is the

Silicoboron-Carbonitride Ceramics: A Class of High Temperature, Dopable Electronic Materials

May 1, 2001
Author(s)
P A. Ramakrishnan, Y T. Wang, Davor Balzar, L A. An, C Haluschka, R Riedel, A M. Hermann
The structure and electronic properties of polymer-derived silicoboroncarbonitride ceramics are reported. Analysis of the short-range order using the radial-distribution-function formalism showed that the local structure comprises Si tetrahedra with B, C

SMPTE Declarative Data Essence: Comparison to ATSC DASE

May 1, 2001
Author(s)
John Barkley, M A. Dolan, M Koo, Andrew McCaffrey, Leonard E. Gebase, Murugiah P. Souppaya
The Declarative Data Essence (DDE) Ad-hoc Group of the D27 Technical Committee of the Society for Motion Picture and Television Engineers [SMPTE] is developing ITV standards that provide basic functionality for ITV and represent current practice, known

Special Ultrasonic Flowmeters for In-Situ Diagnosis of Swirl and Cross Flow

May 1, 2001
Author(s)
Tsyh Tyan Yeh, Pedro I. Espina
The presence of non-ideal flow profiles is known to cause significant metering inaccuracies in conventional pipelines. The characteristics of secondary flows are also important for mixer design where flow non-ideality is highly desired. Advances in

Spectroradiometer Characterization for Colorimetry of LEDs

May 1, 2001
Author(s)
Yoshihiro Ohno, B Kranicz
The uncertainties in color measurements of LEDs by spectroradiometers can be much larger than those for traditional broadband sources due to the quasi-monochromatic nature of LED spectra. In this paper, the uncertainties in chromaticity of LEDS due to

Spontaneous Coherent Microwave Emission and the Sawtooth Instability in a Compact Storage Ring

May 1, 2001
Author(s)
Uwe Arp, Gerald T. Fraser, Angela R. Hight Walker, Thomas B. Lucatorto, K K. Lehmann, K Harkay, N Sereno, K Kim
Strong evidence for self-excited emission of coherent synchrotron radiation in the microwave spectral region was observed at the Synchrotron Ultraviolet Radiation Facility SURF III electron storage ring at the National Institute of Standards and Technology

Strengthening of Reinforced Concrete Beams with Carbon FRP

May 1, 2001
Author(s)
Dat Duthinh, M A. Starnes
Seven concrete beams reinforced internally with steel and externally with carbon fiber-reinforced polymer (FRP) laminate applied after the concrete had cracked were tested under four-point bending. Results show that FRP is very effective for flexural

Surface Oxidation as a Diffusion Barrier for Al Deposited on Ferromagnetic Metals

May 1, 2001
Author(s)
William F. Egelhoff Jr., P J. Chen, Robert D. McMichael, Cedric J. Powell, R Deslattes, F G. Serpa, Romel Gomez
We have used Grazing Incidence X-ray Reflectometry (GIXR) to study surface oxidation as a diffusion barrier for Al deposited on ferromagnetic metals (Co, Fe, Ni, and NiFe). Samples of the form SiO2 // 10nm X / 4nm Al and SiO2 // 10nm X/ 4nm Au with X = (Co

Surges Happen! How to Protect the Appliances in Your Home

May 1, 2001
Author(s)
Francois D. Martzloff
This booklet has been prepared to help home dwellers, owners, contractors, insurance agents, and all parties interested in reducing the number of cases and severity of equipment damage caused by the unavoidable surges that occur in the electrical systems
Displaying 45726 - 45750 of 73994
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