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Displaying 1651 - 1675 of 1721

Barium Hollandite-Type Compounds Ba x Fe 2x Ti 8-2x O 16 with x= 1.143 and 1.333

February 23, 1999

Author(s)

J. M. Loezos, Terrell A. Vanderah, A R. Drews

Experimental X-ray powder diffraction patterns and refined unit cell parameters for two barium hollandite-type compounds. Ba xFe 2xTi 8-2xO 16, with x = 1.143 and 1.333, are reported here. Compared to the tetragonal parent structure, both compounds exhibit

Ceramic Measures: News of the Ceramic Processing Characterization Consortium, February 1999

February 1, 1999

Author(s)

S Jahanmir

Newsletter, Ceramic Measures: News of the Ceramic Processing Characterization Consortium, February 1999, Vol. 3, Issue 1.

The Use of Cyclic Phosphazene Additives to Enhance the Performance of the Head/Disk Interface

January 29, 1999

Author(s)

H J. Kang, Q Zhao, F E. Talke, D J. Perettie, B M. DeKoven, T A. Morgan, Daniel A. Fischer, Stephen M. Hsu, C S. Bhatia

Phase separation of phosphazene additives in perfluoropolyalkylether (PFPAE) lubricants is investigated as a function of additive concentration and lubricant layer thickness. The tribological behavior of various phosphazene additive/lubricant mixtures is

Wear Induced Molecular Orientation in Ultra High Molecular Weight Polyethylene (UHMWPE) Measured by Soft X-Ray Adsorption

January 29, 1999

Author(s)

Daniel A. Fischer, S Sambasivan, M C. Shen, Stephen M. Hsu

Molecular orientation in ultra high molecular weight polyethylene (UHMWPE) when it is subjected to wear is important in understanding the basic wear processes for this material. Current methods of inferring or deducing orientation information for UHMWPE

Effects of Wear Motion on Ultra High Molecular Weight Polyethylene (HMWPE) Molecular Orientation

January 28, 1999

Author(s)

S Sambasivan, Daniel A. Fischer, M C. Shen, Stephen M. Hsu

In a human hip joint, the motion is complex and consists of flexion/extension, abduction, and adduction. Laboratory studies have shown that these motions increase wear significantly. The aim of this study is to measure the change in molecular orientation

Simple Empirical Cluster Expansion Hamiltonians for Modeling Cation Order-Disorder in A(B'^d1/3B2/3)O3 Perovskites Such as Pb(Mg1/3Nb2/3)O3

January 15, 1999

Author(s)

Benjamin P. Burton

Brute force exploration of the simple cubic effective cluster interaction space indicates that linear triplet interaction is both necessary and sufficient to stablizde a P3ml ground state, and a P3ml Fm - 3m transition at 4.5183

Effect of Film Composition on the Orientation of (Ba,Sr)TiO 3 Grains in (Ba,Sr) y TiO 2+y Thin Films

January 12, 1999

Author(s)

Debra L. Kaiser, Mark D. Vaudin, L D. Rotter, John E. Bonevich, J T. Armstrong

(Ba,Sr) yTiO 2+y thin films with 0.34 {1-xSr xTiO 3 (x {aproximately equal to} 0.06) and an amorphous phase. The orientation of the tetragonal Ba 1-xSr xTiO 3 grains (pure a axis, pure c axis, or a mix of the two) was found to be strongly dependent upon

Application of Neutron Interferometry to the Measurement of Thin Film Density

January 1, 1999

Author(s)

William E. Wallace, David L. Jacobson, Muhammad Arif, A I. Ioffe

The application of neutron interferometry to the measurement of the atom density of polymer thin films (

Assessment of Particle Size Measurement Techniques and Procedures: I. Identification and Characterization of a Model Powder System

January 1, 1999

Author(s)

Ajitkumar Jillavenkatesa, Vincent A. Hackley, G Y. Onoda

Particle size distribution of a powder system has been observed to be dependent upon the instrument and technique used for analysis. Often, different instruments based upon the same fundamental principle give different results for the same powder. This

Ceramics 1998 Programs and Accomplishments

January 1, 1999

Author(s)

Stephen W. Freiman

The mission of the Ceramics Division can be stated as follows:Work with industry, standards bodies, academia, and other government agencies in providing the leadership for the Nation's measurements and standards infrastructure for ceramic materials.The

Comparison of Classical and MALDI-TOF-MS Analysis of a Polystyrene Interlaboratory Sample

January 1, 1999

Author(s)

William R. Blair, B M. Fanconi, R J. Goldschmidt, Charles M. Guttman, William E. Wallace, S Wetzel, David L. VanderHart

Over the past several years, the use of MALDI-TOF-MS for analysis of synthetic polymers has increased significantly. As the number of polymer analyses by MALDI has increased, scrutiny of the MALDI results in comparison to classically derived values for Mw

Domain Structure and Interphase Dimensions in Poly(Urethaneurea) Elastomers Using DSC and SAXS

January 1, 1999

Author(s)

S G. Musselman, T M. Santosusso, J D. Barnes, L H. Sperling

Small-angle x-ray scattering (SAXS) and differential scattering calorimetry (DSC) were used to demonstrate distinct differences in domain size, phase separation, and hydrogen bonding in a series of segmented urethaneurea elastomers prepared from isocyanate

Domain Structure and Interphase Dimensions in Poly(Urethaneurea) Elastomers Using DSCand SAXS

January 1, 1999

Author(s)

S G. Musselman, T M. Santosusso, J D. Barnes, L H. Sperling

In-Line Dielectric Sensor for Chemical Composition Measurements in Molten Polymers

January 1, 1999

Author(s)

M M. McBrearty, Anthony J. Bur, S Perusich

We describe a dielectric sensor that incorporates a flow-through design so that it can be placed in-line on an extruder. Dielectric measurements have been successfully applied for measuring additive concentrations in polymer melts during extrusion

Living Poly(Alpha-Methylstyrene) Near the Polymerization Line. Vii. Molecular Weight Distribution in a Good Solvent

January 1, 1999

Author(s)

S S. Das, J Zhuang, A P. Andrews, S C. Greer, Charles M. Guttman, William R. Blair

Measurement of Thermal Conductivity Using Tmdsc: Solution to the Heat Flow Problem

January 1, 1999

Author(s)

S L. Simon, G B. McKenna

Mechanical and Swelling Behaviors of Rubber: a Comparison of Some Molecular Models With Experiment

January 1, 1999

Author(s)

W H. Han, F Horkay, G B. McKenna

Network Structure of Bimodal Epoxies - a Small Angle X-Ray Scattering Study

January 1, 1999

Author(s)

N C. BeckTan, Barry J. Bauer, J Plestil, J D. Barnes, Da-Wei Liu, L Matejka, K Dusek, Wen-Li Wu

Optical Absorption, Raman, and Photoluminescence Excitation Spectroscopy of Inhomogeneous InGaN Films

January 1, 1999

Author(s)

Lawrence H. Robins, Albert J. Paul, C A. Parker, J C. Roberts, S M. Bedair, E L. Piner, N A. El-Masry

In xGa 1-xN films with x=0.06 to x=0.49 were characterized by optical transmittance, Raman, and photoluminescence excitation spectroscopies. Previous microstructural characterizations detected phase separation only in films with x>0.2. The transmittance

Orientation Texture from Polymeric Materials Using Scattering Methods

January 1, 1999

Author(s)

J D. Barnes

Polymeric Materials Interest Group Workshop: Quantitative Determination of Synthetic Polymer Molecular Mass Distribution

January 1, 1999

Author(s)

William E. Wallace

Preliminary report on the NIST molecular mass distribution interlaboratory comparison.

Small-Angle Neutron Scattering of Solutions of Arborescent Graft Polystyrenes

January 1, 1999

Author(s)

S M. Choi, R M. Briber, Barry J. Bauer, A Topp, M Gauthier, L Tichagwa

Spin-on-Glass Thin Films Prepared From a Novel Polysilsesquioxane by Thermal and Ultraviolet-Irradiation Methods

January 1, 1999

Author(s)

Q Pan, G B. Gonzalez, R J. Composto, William E. Wallace, B Arkles, L K. Figge, D H. Berry

The pyrolytic and photolytic conversion of a new polymer precursor, namely -chloroethyl-silsesquioxane (BCESSQ), to an ormosil film is presented. At 350 C the film thickness rapidly decays to 55% of its original thickness within 60 min. A range of ion

Statistical Analysis of NIST Interlaboratory Comparison of Polystyrene Molecular Mass Distribution Obtained by MALDI TOF MS

January 1, 1999

Author(s)

S Wetzel, Charles M. Guttman, Kathleen M. Flynn

Stress Relaxation of Poly(Ethylene Naphthalate): Isothermal, Isochronal, and Isostructural Responses

January 1, 1999

Author(s)

M L. Cerrada, G B. McKenna

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