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Displaying 48276 - 48300 of 73829

D-Kick and Raman Cooling on a Cesium Atomic Fountain

February 1, 2000
Author(s)
L Lising
Atomic clocks similar to the most precise clocks in existence are presently being developed for installation on the International Space Station. The microgravity environment will allow for longer measurement times (factors of 3) and thusincreased accuracy

Effect of Ag on the Primary Phase Field of High T c (Bi,Pb)-2223 Superconductor

February 1, 2000
Author(s)
Winnie K. Wong-Ng, Lawrence P. Cook, W Greenwood, Anthony J. Kearsley
The subsolidus equilibria and the primary phase field (crystallization field) of the 110K high T c (Bi,Pb)-2223 ([Bi,Pb]:Sr:Ca:Cu) superconductor in the presence of Ag have been determined under 7.5 volume % O 2 (92.5 % Ar). A total of 29 six-phase volumes

Electrical Transport and Magnetic Properties of a Possible Electron-Doped Layered Manganese Oxide

February 1, 2000
Author(s)
Y Zhao, Y H. Li, S B. Ogale, M Rajeswari, V Smolyaninova, T Wu, A Biswas, L Salamanca-Riba, R L. Greene, R Ramesh, M Venkatesan, Jake H. Scott
In this paper, we report on the growth of La 067Sr 0.33MnO x thin films in vacuum using pulsed laser deposition and their structural, transport, and magnetic properties. The as-grown thin films have both the matrix La 1.34Sr 0.66MnO 4 phase with K 2NiF 4

Electrokinetic Analyzers

February 1, 2000
Author(s)
P Todd, J J. Pellegrino
Electrokinetic analysis is a family of techniques for estimating the charge on solid surfaces, macroscopic particles, colloidal species, and macromolecular aggregates. Charges on surfaces are critical to the behavior of colloids, coatings, films, fibers

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
Displaying 48276 - 48300 of 73829
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