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  • 1
    Electronic Resource
    Electronic Resource
    Dissociation pathways of carbonyl halides (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 8118-8122 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100361a029
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  • 2
    Electronic Resource
    Electronic Resource
    Observations of nanocrystals in thin TbFeCo films (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 919-921 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Observations of thin films of amorphous TbFeCo by electron microscopy with a resolution limit of better than 0.2 nm invariably reveal the presence of very fine microcrystals (sizes ∼2–5 nm). Bright field imaging, in both plan view and in cross section, indicates that these nanocrystals have the crystal structure of α-Fe or Co. In contrast, crystals of Tb metal (or Tb oxides) have not been observed. Similar observations of FeCo thin films, prepared under identical experimental conditions, reveal much larger crystals (typically 10–50 nm). It is concluded that the presence of the rare earth element Tb is crucial to the microstructure displayed by this kind of material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101622
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of focused light beams with multilayer films: Optimization of magneto-optic recording media (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 92-93 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Reflectance and transmittance of a light beam strongly focused on multilayer thin films are derived at far field. Using the Fourier transfer technique, the reflectance (transmittance) can be expressed in terms of the reflection (transmission) matrix for plane waves. The readout from magneto-optic multilayer films is optimized for a strongly focused beam. It is found that when the focal spot size w0 is less than three wavelengths, the readout is significantly different from that calculated for plane waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100358
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal expansion of the hexagonal (4H) polytype of SiC (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 612-614 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermal expansion of the hexagonal (4H) polytype of SiC was measured from 20 to 1000 °C by the x-ray diffraction technique. The principal axial coefficients of thermal expansion are expressed by the second-order polynomials: α11=3.21×10−6+3.56×10−9T−1.62×10−12T2, and α33=3.09×10−6+2.63×10−9T−1.08×10−12T2 (°C−1). The α11 is larger than the α33 over the entire temperature range, yielding a thermal expansion anisotropy "A'' of 0.04 at room temperature which increases to 0.11 at 1000 °C. The thermal expansion of the (4H) structure is compared with previously published results for the cubic (3C) and the hexagonal (6H) SiC polytypes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337456
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  • 5
    Electronic Resource
    Electronic Resource
    Stress-strain isotherms in compression for thermoreversible polyethylene gels (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 4273-4277 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00201a023
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  • 6
    Electronic Resource
    Electronic Resource
    The isolated layer model and transfer impedances for AlxGa1−xAs/GaAs heterostructures (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1500-1503 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We use the concept of transfer impedances to study a model of Alx Ga1−x As/GaAs heterostructures in which the two-dimensional (2D) gas layer is isolated from the parallel three-dimensional (3D) layer (isolated layer model) but is joined by resistors at the peripheral contacts. We use the conformal mapping method to find the relation between the transfer impedances and the resistivity tensor of the quasi-2D system, and point out differences with the previous literature for a similar model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344410
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  • 7
    Electronic Resource
    Electronic Resource
    Conformal mapping and the current distributions in AlxGa1−xAs/GaAs heterostructures (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 680-685 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show how the conformal mapping method can be used to map out the equipotential and current stream lines for an arbitrary Hall plate with van der Pauw geometry by reformulating the Schwarz–Christoffel equation in a form most convenient for computation. Our numerical technique is then used to determine the potential and current distributions in a AlxGa1−x As/GaAs heterostructure with parallel conduction. Our results for a single layer agree with experimental observations at low magnetic field and for regions between the plateaus of the quantum Hall effect. Equipotential and current stream lines are obtained for two previously proposed models for the heterostructures with parallel conduction: the two-band model and the isolated layer model. In the case of a large Hall angle (near the plateau of the quantum Hall effect) singularities of electric fields occur around the source-drain contacts as in a standard Hall bar. For the isolated layer model, additional singularities are formed around the side contacts due to the circulating Hall current through the side contacts which connect the two-dimensional electron gas layer and the supply layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343537
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  • 8
    Electronic Resource
    Electronic Resource
    Syn-deformational remanent magnetization of the Mount Eclipse Sandstone, central Australia (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 99 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The palaeomagnetism of the latest Devonian-Early Carboniferous Mount Eclipse Sandstone in central Australia reveals samples from 16 out of 31 sites having a consistent hightemperature component of natural remanent magnetization. Site-mean directions from the two limbs of the most detailed studied syncline attain their best grouping after 75 per cent of ‘unfolding’, and further ‘unfolding’ causes a ‘cross-over’ feature. Mineralogical studies using microscope and electron microprobe show that this remanance is most likely to be carried by secondary haematite formed by alteration of Fe-rich minerals during the midCarboniferous deformation. Four different models are examined to reconstruct the palaeohorizontal for the syn-deformational remanence. The best estimate of the palaeomagnetic South Pole position is lat. = 33.8°S, and long. = 121.2°E (dp = 19.2°, dm = 19.7°), close to Australia. This result indicates a rapid polarward movement of eastern Gondwanaland during the first half of the Carboniferous. We also suggest that the widespread Alice Springs Orogeny-related overprints in central Australia were acquired during the beginning of the main phase of deformation in the mid-Carboniferous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb02025.x
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  • 9
    Electronic Resource
    Electronic Resource
    Use of Acidification, Low Temperature, and Sorbates for Storage of Orange Juice (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 54 (1989), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of acidification, combination of acidification and low temperature and sorbates on the storage of orange juice were investigated. Acidification of orange juice to pH 2.0 and pH 2.5 followed by storage at 5°C resulted in marked reduction in total plate count and yeast and mold population during twelve weeks of storage. Use of 0.03% sorbic acid or potassium sorbate in combination with acidification at pH 2.5 resulted in preservation of orange juice stored at 10°C over 10 wk period; however, vitamin C degradation was enhanced by the presence of the sorbates. The results also indicated that relatively high concentrations of vitamin C were present in orange juice containing high population of microorganisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1989.tb04679.x
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  • 10
    Electronic Resource
    Electronic Resource
    A new kind of combinations between the Ritz-Galerkin and finite element methods for singularity problems (1988)
    Springer
    Computing 40 (1988), S. 29-50 
    Details
    ISSN: 1436-5057
    Keywords: Primary 65N10 ; 65N30 ; Elliptic problems ; singularity problems ; finite element methods ; Ritz-Galerkin methods ; combined methods ; nonconforming combinations ; penalty combined methods ; simplified hybridcombined methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es werden Koppelungstechniken zwischen der Ritz-Galerkin- und der Lagrange-Finite-Elemente-Methode der Ordnungk≥1 vorgestellt, die aus einer Kombination von hybriden Techniken und Straffunktionstechniken bestehen. Mit ihrer Hilfe werden komplizierte Probleme bei homogenen und inhomogenen elliptischen Gleichungen gelöst, insbesondere mit Singularitäten oder auf unbeschränkten Bereichen. Für die numerischen Lösungen werden optimale Konvergenzraten in Sobolev-Normen bewiesen. Diese theoretischen Ergebnisse werden in numerischen Experimenten für die singuläre Motz-Gleichung verifiziert.
    Notes: Abstract The coupling techniques of simplified hybrid plus penalty functions are first presented for matching the Ritz-Galerkin method and thek(k〉-1)-order Lagrange finite element methods to solve complicated problems of elliptic equations, homogeneous or nonhomogeneous, in particular with singularities or unbounded domains. Optimal convergence rates of numerical solutions have been proved in the Sobolev norms. Moreover, the theoretical results obtained in this paper have been verified by numerical experiments for the singular Motz problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02242188
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