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Displaying 50501 - 50525 of 73994

Local Environments of Three Forms of Ba 2 Ycu 3 O 6+x

March 12, 1999
Author(s)
Winnie K. Wong-Ng, M Melamud, Lawrence H. Bennett
The Wigner-Seitz local atomic cell construction procedure, provides a topological means for comparing series of related structures in terms of the number and type of nearest neighbors. We used this construction to further our understanding of the chemical

Managing Data-Types: The CORBA Approach and AutoMap/AutoLink, an MPI Solution

March 12, 1999
Author(s)
Martial Michel, A A. Schaff, J E. Devaney
There are many ways to create a distributed system, such as with Parallel Virtual Machine (PVM), PARMACS, p4, Message Passing Interface (MPI) and the Common Object Request Broker Architecture (CORBA).This article concentrates on MPI, CORBA, and the

Enhancements to Data Encryption and Digital Signature Federal Standards

March 4, 1999
Author(s)
Elizabeth B. Lennon
This ITL Bulletin, February 1999, summarizes proposed changes to two Federal Information Processing Standards (FIPS): FIPS 46-2, Data Encryption Standard, and FIPS 186, Digital Signature Standard. It outlines the proposed enhancements to the two standards

Performance of Electrically Addressed Spatial Light Modulators

March 3, 1999
Author(s)
Patrick Grother, M L. Hsieh, Craig I. Watson
We address two important performance limitations of commonly available spatial light modulations. First we present a method for the determination of modulation transfer function and amplitude modulation from CCD captures of imaged gratings. Second, we

A Fiber Optic Sensor for Composite Cure Monitoring

March 1, 1999
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. Van Zanten, Joy Dunkers, C G. Zimba, C A. James, S K. Pollack, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The fiber/resin interface is critical to the final mechanical properties of a composite part. The extent f cure and cross-link density affect the resin structure in this interfacial region. In addition, the type of coupling agent coating the fiber, the

A Phase-Field Model of Solidification With Convection

March 1, 1999
Author(s)
D M. Anderson, Geoffrey B. McFadden, A A. Wheeler
We develop a phase-field model for the solidification of a pure material that includes convection in the liquid phase. The model permits the interface to have an anisotropic surface energy, and allows a quasi-incompressible thermodynamic description in

A Well Collimated Quasi-Continuous Atom Laser

March 1, 1999
Author(s)
Edward W. Hagley, Lu Deng, M M. Kozuma, J Wen, Kristian Helmerson, S L. Rolston, William D. Phillips
We demonstrate extraction of sodium atoms from a trapped Bose-Einstein condensate (BEC) using a coherent stimulated Raman process. Optical Raman pulses drive transitions between trapped and untrapped magnetic sublevels so as to give the output coupled BEC

A Wide Bandwidth Printed Wiring Board Transmission Line Probe

March 1, 1999
Author(s)
Nicholas Paulter, Jon R. Pratt
An inexpensive, wide bandwidth, high cycle 50 ω probe is described for making electrical contact to printed wiring board planar transmission lines. The electrical transfer function of the probe and its contact repeatability are presented.

Analytic Solution for a Non-Axisymmetric Isothermal Dendrite

March 1, 1999
Author(s)
Geoffrey B. McFadden, Sam R. Coriell, R F. Sekerka
The Ivantsov solution for an isothermal paraboloidal dendrite growing into a pure, undercooled melt provides a relation between the bulk undercooling and a dimensionless product, the Peclet number, of the growth velocity and tip radius of the dendrite

Conformance Testing and Certification Model for Software Specifications

March 1, 1999
Author(s)
Lisa J. Carnahan, Lynne S. Rosenthal, Mark Skall
The use of conformity assessment as a means by which buyers and sellers can communicate requirements and conformance will increase as information technology systems and applications grow more complex. Models for conformance testing and certification

Curing of High-Performance Concrete: Report of the State-of-the-Art

March 1, 1999
Author(s)
K W. Meeks, Nicholas J. Carino
This report describes the latest information, technology, and research on the curing of high-performance concrete (HPC). The scope of the report is expanded somewhat to examine the current body of knowledge on the effects of various curing conditions on

Dielectric and Ultrasonic Anomalies at 16, 37, and 65 K in SrTiO 3

March 1, 1999
Author(s)
C Ang, J F. Scott, Z Yu, H M. Ledbetter, J L. Baptista
In this paper we report coincident anomalies in both dielectric response and sound velocities in strontium titanate around three temperatures 16.37 and 65 K. The anomalies occur in both single-crystal specimens and ceramics so they cannot be related to
Displaying 50501 - 50525 of 73994
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