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Displaying 47951 - 47975 of 74220

Equation of State for Polymer Chains in Good Solvents

February 1, 2000
Author(s)
L L. Lue
A free-energy model is developed for polymer chains in good solvents. This model, which combines the ideas of polymer field theory with liquid-state theory, is valid in the dilute, semidilute, and concentrated regimes. The model is compared against

Eye Movement Strategies

February 1, 2000
Author(s)
Julie Epelboim
The human visual system consists of a high-resolution fovea and a low resolution periphery. This arrangement requires us to use eye and head movements to bring objects of interest, detected with low-resolution peripheral vision, to the fovea formore

Ferromagnetic Resonance Detection with a Torsion-mode Atomic-force Microscope

February 1, 2000
Author(s)
M. Loehndorf, John M. Moreland, Pavel Kabos
We have developed a ferromagnetic resonance (FMR) instrument based on a torsion-mode atomic-force microscope (AFM). The instrument measures the torque on a magnetized thin film in a static out-of-plane field perpendicular to the film surface. The magnetic

Four-Wave Mixing With Multiple Spin States

February 1, 2000
Author(s)
J P. Burke, Carl J. Williams, Paul S. Julienne, Y B. Band, M Trippenbach
Four-wave mixing is a common process in nonlinear optics wherein the nonlinear interaction between light and matter allows three light waves to interact or mix and produce a fourth wave with a different central wavevector (and/or frequency). The

FT-IR Microspectroscopy and Multivariate Statistics on Plant Cells

February 1, 2000
Author(s)
B M. Allen
Agricultural biotechnology requires methods for the early diagnosis of the effects of environmental stressors such as excessive exposure to ozone, metal and nutrient deficiencies. The use of Fourier transform infra red microspectroscopy inconjunction with

Hole State Density of La 1-x Sr x CoO^d3-D} (0less then or equal to}xless then or equal to}0.5) Across the Insulator/Metal Phase Boundary

February 1, 2000
Author(s)
A R. Moodenbaugh, B Nielson, S Sambasivan, Daniel A. Fischer, T Friessnegg, S Aggarwal, R Ramesh, B Pfeffer
The oxygen K near edge x-ray absorption fine structure (NEXAFS) of polycrystalline and film La1-xSrxCoO3-d at room temperature was studied using fluorescence yield techniques. The bulk sensitive nature of fluorescence yield (relative to electron yield)

Image Plates for Registration of Far-Ultraviolet Spectra

February 1, 2000
Author(s)
Joseph Reader, Craig J. Sansonetti, R Deslattes
We have tested an autoradiographic photostimulable phosphor image storage plate as a medium for recording spectra in the wavelength region from 50 to 550 and have compared the results with spectra obtained using conventional photographic emulsions. The

Imaging of Impact Damage in Composites Using Optical Coherence Tomography

February 1, 2000
Author(s)
Joy Dunkers, D P. Sanders, Donald L. Hunston, M J. Everett
Resistance to impact damage is extremely important for most composites. Such damage can initiate delamination, one of the most common failure modes in composites.. Because this is such an important failure mode, many studies have tried to develop matrix

Improving PDM Testability Through Standards Harmonization

February 1, 2000
Author(s)
Katherine C. Morris
Product Data Management (PDM) is quickly becoming a mainstay technology supporting product development. Several standards are emerging to support interoperability among PDM systems and between PDM systems and their clients. These standards serve multiple

Kerr Imaging of a Co/Pt Bimodal Magneto-Optical Medium

February 1, 2000
Author(s)
R A. Fry
Spatially-resolved magneto-optical (MO) images of a (0.3 nm Co/1.2 nm Pt)15 multilayer film with perpendicular magnetic anisotropy have been obtained by Kerr microscopy. This material exhibits a major hysteresis loop with two-stepmagnetization reversal

Lifetime-Limiting Strength Degradation From Contact Fatigue in Dental Ceramics

February 1, 2000
Author(s)
Yeon-Gil G. Jung, I M. Peterson, D H. Kim, Brian R. Lawn
Indentation damage and associated strength degradation from multi-cycle contacts with spherical indenters in water are evaluated in four dental ceramics, to examine the hypothesis that the lifetimes of dental restorations are limited by the accumulation of

Low-Frequency Noise of YBCO/Au Junctions

February 1, 2000
Author(s)
Y Xu, John (Jack) W. Ekin, Cameron C. Clickner
We have fabricated ex-situ C-axis YBCO/au junctions with low contact resistivities.

Measuring Bimodal Crystallographic Texture in Ferroelectric PZT Thin Films

February 1, 2000
Author(s)
Mark D. Vaudin, G R. Fox
A powder x-ray diffraction method has been developed to measure the volume fraction of (111), (100), and randomly oriented PZT in 200 nm thick films used for FRAM applications. The integrated and peak intensities of 100, 110, 200 and 222 Bragg peaks from

Measuring the Orientation and Re-Orientation Dynamics of Single Molecules

February 1, 2000
Author(s)
K D. Weston, Lori S. Goldner
Single molecule fluorescence techniques for the study of macromolecular motion and conformational dynamics are useful for understanding the mechanisms of protein action (i.e., protein catalysts, protein pumps, and motor proteins) and protein folding

Melting Analysis of DNA Dumbbells with Repeating Dinucleotide Stem Sequences Reveals Evidence for Long Range Sequence Dependent Interactions in Short Duplex DNA

February 1, 2000
Author(s)
Peter M. Vallone, R. Owczarzy, P. V. Riccelli, A. S. Benight
Melting Analysis of DNA Dumbbells with Repeating Dinucleotide Stem Sequences Reveals Evidence for Long Range Sequence Dependent Interactions in Short Duplex DNA. Optical and DSC melting studies were performed on 12 DNAdumbbells in 85 mM Na+. The stems of

Modeling Study of Ventilation in Manufactured Houses

February 1, 2000
Author(s)
Andrew K. Persily, S R. Martin
The HUD Manufactured Home Construction and Safety Standards (Part 3280, 1994) contain a number of requirements intended to provide adequate levels of outdoor air to the occupants of manufactured homes. In the implementation of these standards, some

Molecular Simulations of Filled Polymers

February 1, 2000
Author(s)
Francis W. Starr, T B. Schroeder, S C. Glotzer
Fillers are commonly used in industrial applications to alter the properties of polymer materials. However, little is known about the microscopic details of polymer-filler interactions, limiting the development and application of new filled polymers. In

New Approaches to the Development of Fire-Safe Materials (NISTIR 6465)

February 1, 2000
Author(s)
A B. Morgan, Jeffrey W. Gilman, Marc R. Nyden, C L. Jackson
Thermoplastic polyetherimide-clay nanocomposites were synthesized from 1,3-phenylenediamine and bisphenol A dianhydride using an in situ approach. Two types of organically treated clays were utilized to synthesize these nanocomposites. The two organically
Displaying 47951 - 47975 of 74220