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Bioscience

Biomaterials

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Displaying 1301 - 1325 of 1729

Friction Measurements of Ultra-Thin Carbon Overcoats in Air

April 1, 2002
Author(s)
P M. McGuiggan, C S. Bhatia, D Bogy, W Fong, Stephen M. Hsu
The friction force as a function of humidity was measured between 5 nm thick carbon films coated onto mica surfaces. The friction was found to be proportional to the area of contact. The shear stress at 0%, 33%, and 100% humidity was measured to be 25 +6

Influence of Processing Rate and Formulation on the Interface Strength of Vinyl Ester/E-Glass Composites

April 1, 2002
Author(s)
Walter G. McDonough, Joy Dunkers, Gale A. Holmes, E Feresenbet, Y H. Kim, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The single fiber fragmentation test was used to investigate the effect of gelation time on interfacial shear properties of fast reacting resin systems. We developed a processing system capable of producing single fiber fragmentation samples with gelation

Non-Equilibrium Pattern Formation in the Crystallization of Polymer Blend Films

April 1, 2002
Author(s)
V Ferreiro, Jack F. Douglas, James A. Warren, Alamgir Karim
The crystallization of polymeric and metallic materials normally occurs under conditions far from equilibrium. The morphologies formed reflect a competition between order associated with the symmetries of the equilibrium crystal geometry and disorder

Quadrupole Effects in Core and Valance Photoelectron Emission From Crystalline Germanium Measured Via a Spatially Modulated X-Ray Interference Field

April 1, 2002
Author(s)
E J. Nelson, Joseph C. Woicik, P Pianetta, I A. Vartanyants, J W. Cooper
Near an x-ray Bragg reflection, two x-ray beams (incident and reflected) with opposite wavevectors exist within the crystal to create an x-ray standing wave (XSW) interference field. The part of the photoelectron yield depending on quadrupole (and higher

Creep of Lanthanum Gallate

March 1, 2002
Author(s)
William E. Luecke, T R. Armstrong
Strontium- and magnesium-doped lanthanum gallate (LSGM) was deliberately prepared to give A-site deficient non-stoichiometry with compositions (La 0.9Sr 0.1)z(Ga 0.8Mg 0.2)O 3-delta (z =1.0,0.98, and 0.95). Creep tests in four-point 950 C 75 Mpa in air

Parallel Calculation of Electron Multiple Scattering Using Lanczos Algorithms

March 1, 2002
Author(s)
Charles E. Bouldin, A L. Ankudinov, J J. Rehr, James S. Sims, Howard Hung
Real space multiple scattering calculations of the elctronic density of states and x-ray spectra in solids typically scale as the cube of the system and basis set size, and hence are highly demanding computationally. For example, calculations near the Si K

Total-Energy-Based Structure Prediction for Decagonal Al-Ni-Co

February 11, 2002
Author(s)
M Mihalkovic, I Al-Lehyani, Eric J. Cockayne, C L. Henley, N Moghadam, J A. Moriarty, Yijun Wang, M Widom
Quasicrystals are metal alloys whose noncrystallographic symmetry and lack of structural periodicity challenge methods of both experimental structure determination and theoretical structural prediction. Here we employ total energy calculations and Monte

Data Analysis Methods for Synthetic Polymer Mass Spectrometry: Autocorrelation

February 1, 2002
Author(s)
William E. Wallace, Charles M. Guttman
Autocorrelation is shown to be useful in describing the periodic patterns found in high-resolution mass spectra of synthetic polymers. Examples of this usefulness are described for a simple linear homopolymer to demonstrate the method fundamentals, a

Molecular Basis of Lubrication

February 1, 2002
Author(s)
Stephen M. Hsu
Lubrication is an art that has been practiced for thousands of years from the early days of our human civilization. The study of lubricatin as a science began in the 17th century with the development of bearings and axles. In the early 20th century, the

NIST Property Data Summaries Titanium Diboride (TiB 2 )

February 1, 2002
Author(s)
R G. Munro
Nearly fully dense polycrystalline TiB 2 can be produced by a variety of processing methods, including sintering, hot pressing, hot isostatic pressing, microwave sintering, and dynamic compaction. The relatively strong covalent bonding of the constituents

Towards Near Perfect Crystals With Only Well-Characterized Imperfections

February 1, 2002
Author(s)
H S. Peiser
Throughout the past century NBS/NIST supported a great variety of research studies in crystallography where the aim was the highest attainable accuracy in measurement. While avoiding overlap with other papers in this volume, this article summarizes results
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