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Bioscience

Biomaterials

Search Publications

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Displaying 1351 - 1375 of 1729

Convalent Cationization Method for the Analysis of Polyethylene by Mass Spectrometry

December 1, 2001
Author(s)
Barry J. Bauer, William E. Wallace, B M. Fanconi, Kathleen M. Flynn
Polyethylene and other polyolefins have not been amenable to mass spectrometric characterization of molecular mass distribution due to the ineffectiveness of conventional methods of cationization. The lack of polar groups, unsaturation, and aromaticity

Crystal Chemistry and Phase Equilibria of Selected SrO- R 2 O 3 -CuO x and Related Systems, R=Lanthanides and Yttrium

December 1, 2001
Author(s)
Winnie K. Wong-Ng, Qingzhen Huang, Igor Levin, James A. Kaduk, J Dillingham, T J. Haugan, J Suh, Lawrence P. Cook
This paper investigates and reviews the trend of phase formation and crystal chemistry of selected series of compounds in SrO- R 2O 3-CuO x and related systems. Including in this discussion are (Ba,Sr) 2RCu 3O 6+x, where M = selected representative and

Dispersion and Nucleating Effects of Clay Fillers in Nanocomposite Polymer Films

December 1, 2001
Author(s)
V Ferreiro, G Schmidt, Charles C. Han, Alamgir Karim
Nanocomposite polymeric materials offer unique properties such as mechanical, electrical, thermal, etc. Such property enhancements are induced not only by the physical presence of the filler but also by the interaction of the polymer with the filler and

Rapid Calculation of X-Ray Absorption Near Edge Structure Using Parallel Computation

December 1, 2001
Author(s)
Charles E. Bouldin, June E. Sims, Howard Hung, J J. Rehr, A L. Ankudinov
Modeling x-ray absorption near edge structure (XANES) requires computationally intensive calculations. We show that parallel processing reduces the time required for XANES calculations by a factor of up to 50 over desktop computers. Parallel processing is

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
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