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  • 1
    Electronic Resource
    Electronic Resource
    The “Authoring on the Fly” system for automated recording and replay of (tele)presentations (2000)
    Springer
    Multimedia systems 8 (2000), S. 158-176 
    Details
    ISSN: 1432-1882
    Keywords: Key words: Multimedia authoring – Electronic note-taking – Real-time random access – Stream synchronization – Educational software
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract. We discuss the problem of capturing media streams which occur during a live lecture in class or during a telepresentation. Instead of presenting yet another method or system for capturing the classroom experience, we introduce some informal guidelines and show their importance for such a system. We derive from these guidelines a formal framework for sets of data streams and an application model to handle these sets so that a real-time replay becomes possible. The Authoring on the Fly system is a possible realization of a framework which follows these guidelines. It allows the capture and real-time replay of data streams captured during a (tele)presentation, including audio, video, and whiteboard action streams. This article gives an overview of the different AoF system components for the various phases of the teaching and learning cycle. It comprises an integrated text and graphics editor for the preparation of pages to be loaded by the whiteboard during the presentation phase. The recording component of the system captures various data streams of the live presentation. They are postprocessed by the system so that they become instances of the class of media for whose replay the general application model was developed. From a global point of view, the Authoring on the Fly system allows one to merge three apparently distinct tasks – teaching in class, telepresentation, and multimedia authoring – into one single activity. The system has been used routinely for recording telepresentations over the MBone net and has already led to a large number of multimedia documents which have been integrated automatically into Web-based teaching and learning environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005300000042
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  • 2
    Electronic Resource
    Electronic Resource
    Cenozoic motion between East and West Antarctica (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 404 (2000), S. 145-150 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The West Antarctic rift system is the result of late Mesozoic and Cenozoic extension between East and West Antarctica, and represents one of the largest active continental rift systems on Earth. But the timing and magnitude of the plate motions leading to the development of this rift system ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35004501
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of transparent Nb/two-dimensional electron gas contacts by using electron cyclotron resonance plasma cleaning (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4440-4442 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of electron cyclotron resonance plasma cleaning on the contact resistance between a superconducting Nb layer and a two-dimensional electron gas in a strained InxGa1−xAs/InP heterostructure is investigated. Cleaning by a He/H plasma results in a rough semiconductor surface and a high interface resistance. In contrast, by using a pure He plasma a smooth semiconductor surface with a considerably lower interface resistance is obtained. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1290256
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of the Sol-Gel Processing on the Fluorescence Properties of Laser Dyes in Tetraethoxysilane Derived Matrices (2000)
    Springer
    Journal of sol gel science and technology 19 (2000), S. 799-802 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; precursor chemistry ; fluorescence properties ; optical solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Two fluorescent dyes were incorporated into sol-gel derived SiO2 matrices. The dye was added to SiO2 precursors of different degrees of pre-condensation and the spectroscopic properties of the immobilized dye were measured at various aging and drying stages of the resulting gels. The significant influence of the processing parameters on the spectroscopic properties is manifested in the relative intensity of a second red shifted emission band (550–560 nm), which was observed besides the typical coumarin emission band (495 nm). The appearance of this long wavelength emission might be attributed to dye aggregation or to other reactions with the ambient matrix forced by micro porosity phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008768318418
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  • 5
    Electronic Resource
    Electronic Resource
    Surface induced reactivity for titanium by ion implantation (2000)
    Springer
    Journal of materials science 11 (2000), S. 383-391 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Calcium and phosphorus storage in a thin layer of titanium surface was achieved by ion implantation. We study the reactivity of this surface in response to a hydrothermal treatment. The incipient implanted species are observed to convert to Ca2+ and PO4 3-, the precursors for generating calcium phosphate polymorphs. Hydroxyapatite is formed from these precursors by an interface-liquid mediated mineralization preceded by the hydrolysis of oxygen compounds of Ca and P from the solid phase. The morphology and organization of apatite mineral is controlled by the fluid dynamics reflecting the surface remodeling to adapt to the available local environment. Exposed to calcium and phosphate ion containing solution, the hydrothermally treated surface templates hydroxyapatite deposition. Ca and P implanted Ti surface was shown to be chemically and morphologically actively involved in the interfacial reactions. ©2000 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008938125348
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of an ethylene receptor family with differential expression in rose (Rosa hybrida L.) flowers (2000)
    Springer
    Plant cell reports 19 (2000), S. 1232-1239 
    Details
    ISSN: 1432-203X
    Keywords: Keywords Abscisic acid ; Ethylene ; ETR homologues ; Flower senescence ; Rosa hybrida ; Abbreviations ABA Abscisic acid ; DIG Digoxigenin ; SSC Standard saline citrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  To analyze differences in flower longevity and ethylene sensitivity, we isolated Rosa hybrida gene fragments with sequence similarity to the Arabidopsis thaliana ethylene receptor gene-family. A rose gene (RhETR1) highly similar to AtERS1 had been previously sequenced. Here, we report the isolation of three additional partial rose genes (RhETR2–4) belonging to different sub-groups of ethylene receptor genes. RhETR2 clusters with AtETR1, RhETR4 with AtERS1 and RhETR1, whereas RhETR3 shows high sequence similarity to AtETR2 and AtERS2. Expression analysis of RhETR2 and RhETR3 revealed that they are differentially expressed. RhETR2 is expressed at a constitutive level throughout flower development whereas RhETR3 expression increases in senescing flowers of the cultivar Bronze which has a short floral life while it remains at low levels in the long-lasting flowers of the cultivar Vanilla. Expression of both genes was increased by ABA and ethylene treatment, but transcript abundance differed between rose cultivars with different postharvest performance. These results indicate that differences in flower life among rose cultivars could be due to differences in receptor levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990000251
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  • 7
    Electronic Resource
    Electronic Resource
    Electron Spectroscopy of Single-Layer (n = 1) Bi2Sr2−xLaxCuO6+δ Crystals at Optimal Doping (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 883-887 
    Details
    ISSN: 1572-9605
    Keywords: high-temperature superconductors ; angle-reserved photoemission ; x-ray absorption spectroscopy ; electronic structure ; cuprate superconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract On single crystals of the single-layer (n = 1) high-T c superconductor Bi2Sr2−x La x CuO6+δ at optimal doping (x = 0.4), the electron spectroscopies x-ray absorption (XAS) and high-resolution angle-resolved photoemission (ARPES) were performed. The XAS gives the intensity of the so-called prepeak of the O 1s line what is due to the unoccupied part of the Zhang–Rice (ZR) singlet band. For ARPES, the advantages of single-layer material are the absence of bilayer effects and the possibility to study the electronic properties of the normal state at a sample temperature where the thermal broadening is extremely small (〈10 meV). The controlled variation of the polarization vector of the synchrotron radiation made it possible to resolve a distinct fine-structure of the occupied part of the ZR singlet band at the Fermi level. These observations have enormous consequences for line shape analyses and the determination of pseudogaps, and thus the mechanism of high-T c superconductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026430432376
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic Anisotropy of PrNi5 Single Crystal at Millikelvins (2000)
    Springer
    Journal of low temperature physics 120 (2000), S. 435-448 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetic ordering in the hyperfine enhanced nuclear ferromagnet PrNi5 was investigated in external magnetic fields up to 72 mT at temperatures from below the ordering temperature up to about 20 mK. An anisotropy of the magnetization and ac susceptibility was observed for two single crystalline samples having a or c crystallographic axis parallel to the external field. The results show that the nuclear magnetic moments of Pr are ordered in the basal plane of the hexagonal crystal structure of PrNi5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004644905467
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  • 9
    Electronic Resource
    Electronic Resource
    Calculation of Magnetic Properties and Specific Heat for the Nuclear Enhanced Ferromagnet PrNi5 (2000)
    Springer
    Journal of low temperature physics 120 (2000), S. 401-434 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A general model hamiltonian for hyperfine enhanced magnetic materials is presented. The use of the model is not limited only to the nuclear regime, but the model treats also situations when the strength of the exchange interaction is close to and above the threshold value. The model is solved numerically for PrNi5 and the results are compared with recent ultra-low temperature experiments. In particular, the behavior of magnetization, susceptibility, and specific heat of PrNi5 is studied for two external field geometries and anisotropic properties are pointed out. The effect of the quadrupole interaction is examined in detail. The question of the correlations among interacting ions is also addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004692821396
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  • 10
    Electronic Resource
    Electronic Resource
    Investigations on selected gallium doped lanthanum chromites as electrode materials for HC detection (2000)
    Springer
    Ionics 6 (2000), S. 359-363 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Perovskite-type mixed oxides with the formula La1−xGa0.3Cr0.7O3−δ (x=0.2; 0.1; 0.05; 0) were investigated in view of their usability as electrode materials in exhaust gas sensors for HC detection. The electrode materials were characterised regarding their structure, catalytic activity for propene oxidation and potentiometric behaviour in combustible gaseous mixtures. XRD-measurements indicate, that the solid oxide method does not permit lanthanum deficiencies x ≥ 0.05. The electrodes show non Nernstian behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374153
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