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Displaying 1351 - 1375 of 1721

The 2001 Annual Meeting of the American Crystallographic Association

November 6, 2001
Author(s)
Alan D. Mighell
The annual meeting of the American Crystallographic Association was held in Los Angeles, California, July 2126, 2001. The scientific sessions and the exhibit show were held in the Westin Bonaventure Hotel in downtownLos Angeles. The meeting was well

High Pressure X-Ray Crystallography With the Diamond Cell at NIST/NBS

November 1, 2001
Author(s)
Gasper J. Piermarini
Scientists in the Crystallography Section at NIST/NBS made several outstanidng contributions greatly influencing the development and advancement of high pressure x-ray crystallography during the second-half of the 20th century. These milestone achievements

Interfacial Shear Strengths of Dental Resin-Glass Fibers by the Microbond Test

November 1, 2001
Author(s)
Walter G. McDonough, Joseph M. Antonucci, Joy Dunkers
In this study, the feasibility of using the microbond test (MBT) to probe the durability of the bond between a dental resin with differently silanized E-glass fibers was investigated. The E-glass fibers were silanized with equivalent amounts of two types

JCPDS-ICDD Research Associateship (Cooperative Program With NBS/NIST)

November 1, 2001
Author(s)
Winnie K. Wong-Ng, H F. McMurdie, C R. Hubbard, Alan D. Mighell
The Research Associateship Program of the Joint Committee on Powder Diffraction -International Centre for Diffraction Data (JCPDS-ICDD, now known as the ICDD) at NBS/NIST was a long-standing (over 35 years), successful, industry-government cooperation. The

NIST Materials Properties Databases for Advanced Ceramics

November 1, 2001
Author(s)
R G. Munro
The NIST Ceramics Division maintains two materials property databases on the physical, mechanical, thermal, and other properties of high temperature superconductors and structural ceramics. Crystallographic data are featured prominently among the physical

Phase Equilibria and Crystallography of Ceramic Oxides

November 1, 2001
Author(s)
Winnie K. Wong-Ng, Robert S. Roth, Terrell A. Vanderah, H F. McMurdie
Research in phase equilibria and crystallography has been a tradition in the Ceramics Division at NIST since the early thirties. In the early years, effort was concentrated in areas of Portland cement, ceramic glazes and glasses, instrument bearings and

Polyelectrolyte Adsorption on Hydroxyapatite

November 1, 2001
Author(s)
Vincent A. Hackley
Hydroxyapatite (HAP) belongs to a family of structurally and chemically related, sparingly soluble calcium phosphate (CP) salts [1], and is the structural prototype for the principal mineral component of bone and teeth [2]. Well-defined synthetic HAP has

Quasicrystals

November 1, 2001
Author(s)
John W. Cahn
The discretely diffracting aperiodic crystals termed quasicrystals, discovery at NBS in the early 1980s, have led to much interdisciplinary activity involving mainly materials science, physics, mathematics, and crystalography. It led to a new understanding

Standard Reference Material (SRM 1990) for Single Crystal Diffractometer Alignment

November 1, 2001
Author(s)
Winnie K. Wong-Ng, T Siegrist, G DeTitta, L Finger, H Evans, E Gabe, G Enright, J T. Armstrong, M Levenson, Lawrence P. Cook, C R. Hubbard
Through extensive international collaborations, a standard reference material, SRM 1990 (a set of 3500 units of Cr-doped Al2O3, or ruby sphere) for single crystal diffractometer alignment has been certified at NIST after a successful international round

VAMAS: Accomplishments and Future Directions

November 1, 2001
Author(s)
Stephen W. Freiman, E A. Early
The Versailles Project on Advanced Materials and Standards (VAMAS) was created in 1982 to support trade through international collaboration in pre-standards research in advanced materials. VAMAS has become self-sustaining through Memoranda of Understanding

Comparisons of Calculated and Measured Flaw Sizes

October 1, 2001
Author(s)
George D. Quinn, J Swab
Fracture mechanics often is applied in fractographic analyses in order to verigy that the correct feature has been identified as the fracture origin. This step has been codified in ASTM Standard C1322-96, Standard Practice for the Characterization of

Fractographic Analysis of Machining Cracks in Silicon Nitride Rods and Bars

October 1, 2001
Author(s)
George D. Quinn, L K. Ives, S Jahanmir, P Koshy
A new fixture for flexural strength testing was used to evaluate the effects of machining on the flexural strength of a toughened sintered reaction-bonded silicon nitride. Different grinding procedures had various effects upon the flexure strength

Role of Flaw Statistics in Contact Fracture of Brittle Coatings

October 1, 2001
Author(s)
P Miranda, Antonia Pajares, F Guiberteau, F Cumbrera, Brian R. Lawn
A flaw statistics analysis is here developed to account for systematic differences between experimentally observed and theoretically predicted critical loads for the initiation of contact-induced radial cracks in brittle coatings on compliant substrates

Standards for Reliability Testing of Heavy Vehicle

October 1, 2001
Author(s)
S Jahanmir, James F. Kelly, William E. Luecke
The objective of this project is to develop international standard test methods for assessing the reliability of ceramic components used in diesel engines and other heavy vehicle propulsion systems. Advanced ceramics such as silicon nitrides offer unique

Time-Resolved Isothermal Crystallization of Absorbable PGA-co-PLA Copolymer by Synchrotron Small-Angle X-Ray Scattering and Wide-Angle X-Ray Diffraction

October 1, 2001
Author(s)
Z G. Wang, X H. Wang, B S. Hsiao, S Andjelic, D Jamiolkowski, J McDivitt, J Fischer, J Zhou, Charles C. Han
The isothermal crystallization behavior of absorbable dyed and undyed PGA-co-PLA copolymers was investigated by time-resolved simultaneous synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) methods. The morphological

Sapphire Statistical Strength Characterization

September 7, 2001
Author(s)
D R. McClure, R W. Cayse, S Goodrich, D McCullum, D C. Harris, K Lagerlof, C E. Patty, D H. Platus, Robert S. Polvani, David R. Black
Approximately 1400 4-point flexure specimens were tested at 300 K to 873 K to establish an engineering database for the strength of sapphire. Coupons represented material used for two missile windows and one missile dome. For one window, coupons were
Displaying 1351 - 1375 of 1721