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Displaying 50476 - 50500 of 74335

Acid-Assisted Consolidation of Powder Compacts: Cold-Welding or Cold Sintering

June 1, 1999
Author(s)
M P. Dariel, M Ratzker, F Eichmiller
Silver powder that has been treated in dilute fluoroboric acid solution and compacted at room temperature displays surprisingly elevated flexural and even tensile strength. The density and mechanical strength values increase with increasing compaction

An Overview of the Development of Technical Infrastructure in the Asia-Pacific Region: The Work of the Asia-Pacific Economic Cooperation (APEC) Sub-Committee in Standards and Conformance (SCSC) and the Specialist Regional Body (SRBS)

June 1, 1999
Author(s)
C R. DeVaux
The development and maintenance of an economy's standards and conformance technical infrastructure is critical to its economic health. By increasing the competence of its measurement and testing capabilities, in particular, an economy can provide

Analysis of Current Flow in Mono-Crystalline Electrical Linewidth Structures

June 1, 1999
Author(s)
S Smith, I. A. Lindsay, Anthony Walton, Michael W. Cresswell, Loren W. Linholm, Richard A. Allen, M. Fallon, Alan Gundlach
The current flow in lightly doped mono-crystalline silicon structures designed for use as low cost secondary reference linewidth standards is investigated. It is demonstrated that surface charge can have a significant effect upon the measurements of

Analysis of Residual Stress State in Thermal Barrier Coatings

June 1, 1999
Author(s)
Tze-Jer Chuang, Lin-Sien H. Lum
To enhance thermal efficiency of a system in high temperature structural applications, thermal barrier coatings (TBC) are often applied on the metallic substrate to protect the component from deterioration while increasing the operating temperature of the

Annealing Effects on the Coercivity of SmCo 5 Nanoparticles

June 1, 1999
Author(s)
K Chowdary, A K. Giri, K Pellerin, S. A. Majetich, J H. Scott
The enhanced coercivity of ball milled nanoparticles of SmCo 5 has been attributed to the reduced particle size, but the milling process introduces additional strain which can also affect the coercivity. Here the effects of size and strain are decoupled

Assessing Algorithms as Computational Models for Human Face Recognition

June 1, 1999
Author(s)
P J. Phillips, Alice J. O'Toole, Y Cheng, B Ross, H A. Wild
We assessed the qualitative accord between several automatic face recognition algorithms and human perceivers. By comparing model- and human-generated measures of the similarity between pairs of faces, we were able to evaluate the suitability of the

Assessment Error Sources in Rockwell Hardness Measurements

June 1, 1999
Author(s)
Walter S. Liggett Jr, Samuel Low, David J. Pitchure, Jun-Feng Song
In the use of hardness test blocks, the uncertainty due to block non-uniformity can be reduced if one is willing to make measurements at specified locations on the blocks. Statistical methods for achieving this reduction are explained in this paper. The

Behavior of a Charged Two-Level Fluctuator in Al-AlO x -Al Single-Electron Transistor

June 1, 1999
Author(s)
M. Kenyon, J. L. Cobb, A. Amar, D. Song, C. J. Lobb, Neil M. Zimmerman, F. C. Wellstood
We have studied the behavior of a charged two-level fluctuator in an Al-AlO x -Al single-electron transistor (SET) in the normal state over a temperature range from 85 mK to 3K. The fluctuator caused the SET's island charge to shift by δQ0= 0.11 0.025 e

Calibration of Thin-Film Thermocouples on Silicon Wafers

June 1, 1999
Author(s)
Kenneth G. Kreider, Dean C. Ripple, D P. DeWitt
Thin-film thermocouples (TFTCs) can be fabricated from a much broader range of electrical conductors than wire thermocouples, but even with the same composition as the wire thermocouple, the TFTCs may have different thermoelectric coefficients. Also, the

Collisions of Cold Magnesium Atoms in a Weak Laser Field

June 1, 1999
Author(s)
M Machholm, Paul S. Julienne, K A. Suominen
We calculate the laser-induced collisional loss of laser-cooled and trapped magnesium atoms for detunings up to 30 atomic linewidths to the red of 1S O -> 1P 1 cooling transition. Magnesium is an excellent test case for theoretical studies, because it can

Coplanar Transmission Lines with Meandering Center Conductors in Y-Ba-Cu-O/Au Bilayers

June 1, 1999
Author(s)
C Weber, Ronald H. Ono, James Booth, Leila R. Vale, Samuel Benz, A. M. Klushin, H. Kohlstedt, R. Semerad
We have investigated both conventional and meandering coplanar microwave transmission lines patterned in Y-Ba-Cu-O/Au bilayers on yttria-stablized zirconia and sapphire substrates. Within the meandering waveguides, the gentre conductor was deformed from a

Crossover Behavior in Dilute Polymer Solutions: Square-Well Chains

June 1, 1999
Author(s)
L L. Lue, S B. Kiselev
Monte Carlo simulations for model polymer chains composed of hard spheres with square-well attractions were performed to find a precise relation between the parameters of a crossover theory and the parameters of the square-well chain.

Cyclic Voltammetry on Ag(111) and Ag(100) Faces in Sodium Hydroxide Solutions

June 1, 1999
Author(s)
B M. Jovic, V D. Jovic, Gery R. Stafford
The electrochemical behavior of silver (100) and (111) single crystal surfaces was examined in aqueous NaOH solution. The first step of silver oxidation is the electrosorption of OH- ions followed by phase transformation into a monolayer. The difference in

Defining Flashover for Fire Hazard Calculations

June 1, 1999
Author(s)
Richard D. Peacock, Paul A. Reneke, Richard W. Bukowski, Vyto Babrauskas
As the use of performance-based methods for evaluating the fire behavior of materials and systems becomes more widespread, objective criteria to judge fire behavior become more important. This paper reviews techniques for predicting the most common of

Delivery of an Advanced Double-Hull Ship Welding System using RoboCrane

June 1, 1999
Author(s)
Roger V. Bostelman, Adam S. Jacoff, Robert Bunch
The Office of Naval Research has sponsored a collaborative effort between the Naval Surface Warfare Center Carderock Division, Advanced Technology and Research Corporation, Newport News Shipbuilders, the National Institute of Standards and Technology (NIST
Displaying 50476 - 50500 of 74335
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