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Journals

Radio Wave Propagation Characteristics in Lossy Circular Waveguides such as Tunnels, Mine Shafts, and Boreholes

September 1, 2000

Author(s)

Christopher L. Holloway, David A. Hill, Roger Dalke

Processing and Mechanical Properties of A1203/Ni3AI Composites with Interpenetrating Network

September 1, 2000

Author(s)

S Skirl, Ralph Krause, Sheldon M. Wiederhorn, J Rodel

Composites with microstructures of interpenetrating networks were manufactured by gas pressure infiltration of the Ni 3Al into porous preforms of aluminum oxide...

Structural Study of Ba₁₁Fe₈Ti₉O₄₁ 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...

Modeling and Simulation of MAC Protocols for Wireless Devices: Coexistence Performance Evaluation

August 28, 2000

Author(s)

Nada T. Golmie, F Mouveaux

The IEEE 802 has recently formed a new working group, 802.15, for developing Physical and Medium Access Control layer specifications for Wireless Personal Area...

Direct Evidence for Watson-Crick Base Pairs in a Dynamic Region of RNA Structure

August 23, 2000

Author(s)

B. Luy, John Marino

Trans-H-bond 2hJ N1N3 scalar couplings were measured for the RNA hairpin, CopA29, which is derived from the R1 plasmid encoded RNA transcript, CopA, 21 using a...

Web Usability Logging: Tools and Formats

August 15, 2000

Author(s)

John V. Cugini

Systematic usability studies of web-based applications require software tools and data standards to support both the capture and representation of users'...

Low Harmonic Distortion in a Josephson Arbitrary Waveform Synthesizer

August 14, 2000

Author(s)

Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus

The use of broadband integrated filters has enabled practical operating margins for ac waveforms synthesized from the perfectly quantized voltage pulses of...

Use of Instrumented Indentation to Determine Mechanical Properties of Thin Films, Coatings and Functionally Graded Materials

August 10, 2000

Author(s)

Douglas T. Smith

Instrumented indentation testing is an effective local probe of the elastic and plastic properties of a material, and is particularly useful in the study of...

Characterization of a Series of Self-Assembled Monolayers of Alkylated 1-Thia(Ethylene Oxides)(4-8) on Gold

August 8, 2000

Author(s)

David J. Vanderah, C Pham, S Springer, Vitalii I. Silin, Curtis W. Meuse

Self-assembled monolayers (SAMs) of a series of linear thiols containing a1-thiaoligo(ethylene oxide) [TOEO] moiety, i.e., HS(EO)xR - where R = C10H21, EO =...

The Electronic Spectrum of the Prephenate Dianion. An Experimental and Theoretical (MD/QM) Comparison

August 2, 2000

Author(s)

A. E. Roitberg, S. E. Worthington, Marcia J. Holden, M P. Mayhew, Morris Krauss

Prephenate is the product of a Claisen rearrangement of chorismate. The enzyme chorismate mutase (CM from B. subtilis) accelerates the reaction by a factor of...

Phonons and Static Dielectric Constant in CaTiO₃ From First Principles

August 1, 2000

Author(s)

Eric J. Cockayne, Benjamin P. Burton

CaTiO 3 has a static dielectric constant that extrapolates to a value greater than 300 at zero temperature. We investigate the origin of this large dielectric...

The Effect of Anisotropy on the Second Virial Coefficient of H₂

August 1, 2000

Author(s)

Allan H. Harvey, M P. Hodges

Recently, Diep and Johnson 1 developed a pair potential for H 2-H 2 fitted to ab initio calculations at the coupled-cluster (CCSD(T)) level extrapolated to the...

Use of Integrating Spheres as Uniform Sources for Accelerated UV Weathering of Advanced Materials

August 1, 2000

Author(s)

Joannie W. Chin, Jonathan W. Martin, Walter E. Byrd, E Embree

The primary method for obtaining laboratory weathering data for a wide range of commercial polymer products including coatings, textiles, elastomers, plastics...

Characterization of Coating Microstructure Using Laser Scanning Confocal Microscopy

August 1, 2000

Author(s)

Li Piin Sung, Maria E. Nadal, Paul E. Stutzman, M E. McKnight

The appearance of coating materials depends on the physical attributes of the object's interaction with light. These physical attributes include the light...

A Thermodynamic Study of the Conversion of Chorismate to Isochorismate

August 1, 2000

Author(s)

Yadu D. Tewari, A M. Davis, Prasad T. Reddy, Robert N. Goldberg

Microcalorimetry and high performance liquid chromatography were used to conduct a thermodynamic investigation of the biochemical reaction chorismate(aq) =...

NIST Micronutrients Measurement Quality Assurance Program: Characterizing Individual Participant Measurement Performance over Time

August 1, 2000

Author(s)

David L. Duewer, Margaret C. Kline, Katherine E. Sharpless, Jeanice M. Brown Thomas, M. Stacewicz-Sapuntzakis, A. L. Sowell

ISO/IS 10303-227; Product Data Representation and Exchange Application Protocol: Plant Spatial Configuration

August 1, 2000

Author(s)

Mark E. Palmer, M Gilbert

This document specifies the application protocol for the exchange of the spatial configuration of plant systems with a central emphasis on piping systems. This...

Impact of Elevated Ambient Temperatures on Capacity and Energy Input to a Vapor Compression System -- Literature Review

August 1, 2000

Author(s)

S F. Yana Motta, Piotr A. Domanski

Operation of a system at elevated ambient temperatures inherently results in a lower coefficient of performance (COP). This conclusion comes directly from...

Linear Procedures for Structures with Velocity-Dependent Dampers

August 1, 2000

Author(s)

Fahim Sadek, B Mohraz, Michael A. Riley

Passive energy dissipation devices are used to reduce the damaging effects of earthquakes. These devices can absorb a portion of the earthquake-induced energy...

Observation of Resonances Associated With Stereo and Regio Defects in the Crystalline Regions of Isotatic Polypropylene: Towards a Determination of Morphological Partitioning

August 1, 2000

Author(s)

David L. VanderHart, R G. Alamo, Marc R. Nyden, M S. Kim, L Mandelkern

We report defect-resonance patterns associated with 2 kinds of low-concentration defects typically found in metallocene-synthesized isotactic polypropylenes...

An Investigation of High Speed Grinding With Electroplated Diamond Wheels

August 1, 2000

Author(s)

T W. Hwang, Christopher J. Evans, S Malkin

An investigation was undertaken to evaluate the effect of high wheel speeds for grinding of silicon nitride ceramic with electroplated diamond wheels. Straight...

Non-Collinear Exchange Coupling in Fe/Mn/Fe(001): Insight From a Microscopic STM View

August 1, 2000

Author(s)

Angela Davies, Robert Celotta, J A. Stroscio

The film growth and morphology of epitaxial Mn films grown on Fe(001) single crystal whiskers measured with scanning tunneling microscopy (STM) provides insight...

Thermal-Conductivity Apparatus for Steady-State, Comparative Measurement of Ceramic Coatings

August 1, 2000

Author(s)

Andrew J. Slifka

An apparatus has been developed to measure the thermal conductivity of thermal barrier coatings. Since the method uses an infrared microscope for temperature...

Vortex Pinning in Microindented Yba₂Cu₃O_7-x Single Crystals

August 1, 2000

Author(s)

Marina Turchinskaya, Douglas T. Smith, Alexander L. Roytburd, Debra L. Kaiser

A high resolution magneto-optical technique with a magnetic indicator film was used to study the effect of a regular array of micrometer-sized mechanical...

Cracking of Brittle Coatings Adhesively Bonded to Substrates of Unlike Modulus

August 1, 2000

Author(s)

K -. Lee, Y W. Rhee, Douglas H. Blackburn, Brian R. Lawn, H Chai

The role of elastic mismatch in determining critical conditions for indentation fracture in brittle coatings on substrates of unlike modulus is investigated. A...

Suppression of Fatigue Cracking With Nanometer-Scale Multilayered Coatings

August 1, 2000

Author(s)

Mark R. Stoudt, R C. Cammarata, Richard E. Ricker

(Scripta Materialia doesn't use an Abstract -- Took 1st sentence of Intro) Fatigue crack initiation in initally smooth samples of ductile metals free of surface...

The Fundamental Physical Constants

August 1, 2000

Author(s)

Peter J. Mohr, Barry N. Taylor

The Committee on Data for Science and Technology (CODATA) was established in 1966 as an interdisciplinary committee of the International Council of Science...

Bidirectional Reflectance Round-Robin in Support of the Earth Observing System Program

August 1, 2000

Author(s)

E A. Early, P Y. Barnes, Bettye C. Johnson, James J. Butler, C J. Bruegge, S F. Biggar, P R. Spyak, M M. Pavlov

Laboratory measurements of the bidirectional reflectance distribution function (BRDF) of diffuse reflectors are required to supportcalibration in the Earth...

The Structure of O₃ -CH₄ and the Implications for the O + CH₄ Precursor-Initiated Reaction

August 1, 2000

Author(s)

Angela R. Hight Walker, Gerald T. Fraser, R D. Suenram, Francis J. Lovas

The rotational spectrum of the O 3--CH 4 complex has been measured in a molecular beam using a pulsed-nozzle Fourier-transform microwave spectrometer. An a-type...

Direct Imaging of Highly Charged Ions in an Electron Beam Ion Trap

August 1, 2000

Author(s)

James V. Porto, I Kink, John D. Gillaspy

We have directly observed the ion cloud distribution in an electron beam ion trap using visible and ultraviolet fluorescence from lines in the ground term of Ar...

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