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Displaying 47051 - 47075 of 74178

Structural Study of Ba 11 Fe 8 Ti 9 O 41 by X-Ray Diffraction

September 1, 2000
Author(s)
T Siegrist, C Svensson, Terrell A. Vanderah, Robert S. Roth
The crystal structure of Ba 11Fe 8Ti 9O 41 was determined using single-crystal and powder X-ray diffraction nethods. This new phase crystallizes in the hexagonal space group P6 3/mmc (No 194) (a=5.7506(3) , c=61.413(2) ; Z=2; Pcalc=5.75 g/cm 3) and

Synthesis, Characterization and Evaluation of Urethane Derivatives of Bis-GMA

September 1, 2000
Author(s)
C A. Khatri, J W. Stansbury, Carl R. Schultesiz, Joseph M. Antonucci
The dimethacrylate monomer designated as Bis-GMA ushered in the modern era of polymeric dental restorative, sealant and adhesive materials. Because of its high viscosity, primarily due to the strong hydrogen bond interactions arising from its two hydroxyl

Technical Digest, Symposium on Optical Fiber Measurements, 2000

September 1, 2000
Author(s)
Paul A. Williams, Gordon W. Day
Polarization mode dispersion (PMD), multimode fiber parameters, fiber geometry and chromatic dispersion mapping in fibers are some of the measurement issues in this digest of papers presented at the Symposium on Optical Fiber Measurements held September 26

The Effect of Oscillatory Shear Flow on Step Bunching

September 1, 2000
Author(s)
B T. Murray, Sam R. Coriell, A A. Chernov, Geoffrey B. McFadden
During crystal growth, an imposed shear flow at the crystal-fluid interface can impact the conditions for the onset of morphological instability. In previous work, we studied the effect of time-independent shear flows and anisotropic interface kinetics on

The Effect of Suggested Changes to the Rockwell Hardness Test Method

September 1, 2000
Author(s)
Samuel R. Low III, David J. Pitchure, C D. Flanigan
In the latest revision of the ISO Rockwell hardness test standard (ISO/FDIS 6508(E), 1999), the introductory paragraphs introduce changes to the test practice; one new to this revision, and one suggested as a possibility for the next revision. The change

The Ternary Eutectic of Sn-Ag-Cu Solder Alloys

September 1, 2000
Author(s)
Kil-Won Moon, William J. Boettinger, Ursula R. Kattner, Frank S. Biancaniello, C A. Handwerker
New measurements using precision thermal analysis and existing experimental data for the Sn-Ag-Cu system are summarized. For Sn-Ag-Cu alloys, the location of the ternary eutectic involving L, Sn, Ag3Sn, and Cu6Sn5 phases in the Sn-rich corner is of

The Trilogy Update of IEEE Std. C62.41

September 1, 2000
Author(s)
Francois D. Martzloff
Progress report on the restructuring of two IEEE standards concerned with surges in low-voltage a.c. power circuits into a Trilogy of three documents. First a basic Guide describes the surge environment, then a Recommended Practice proposes a limited set

Waveguide Atom Beam Splitter for Laser-Cooled Neutral Atoms

September 1, 2000
Author(s)
D Muller, Eric A. Cornell, M Prevedelli, P Schwindt, A A. Zozulya, D Z. Anderson
A laser-cooled neutral-atom beam from a low-velocity intense source is split into two beams while it is guided by a magnetic-field potential. We generate our multimode beam-splitter potential with two current-carrying wires upon a glass substrate combined

XML Technologies

September 1, 2000
Author(s)
Mary C. Brady, Carmelo Montanez-Rivera, Richard M. Rivello, Lisa J. Carnahan
An Internet language called the Extensible Markup Language (XML) is rapidly becoming one of the most popular languages in the world. XML is being incorporated into many Internet Web pages and applications; it is particularly useful for those involving

Meeting the Metrology Needs of the Microdisplay Industry

August 31, 2000
Author(s)
Paul A. Boynton, Edward F. Kelley, John M. Libert
Measuring the optical characteristics of microdisplays produce challenges to traditional display metrology. When using light-measuring devices to measure scenes having high contrasts or wide color variations, they suffer the effects of veiling glare or

Nanotechnology for Next-Generation Josephson Voltage Standards

August 30, 2000
Author(s)
Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
We have developed two voltage standard systems: the programmable Josephson voltage standard and the Josephson arbitrary waveform synthesizer. The programmable system is fully automated and provides stable programmable DC voltages from -1.2 V to +1.2 V. The
Displaying 47051 - 47075 of 74178