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  • 1995-1999  (80)
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  • 1
    GFZ publications
    GFZ publications
    Effectiveness of FUYO-1 (JERS)/OPS-SWIR bands for mineral exploration : final report (1995)
    Potsdam : Geoforschungszentrum
    Associated volumes
    Details Availability
    Call number: 21/STR 95/24
    In: Scientific technical report
    Type of Medium: GFZ publications
    Pages: 16, [20] Bl.
    Series Statement: Scientific technical report / Geoforschungszentrum Potsdam 95,24
    Classification:
    Photogrammetry, Remote Sensing
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    GFZ publications
    GFZ publications
    Konzeptentwicklungen zur Verarbeitung und Auswertung von MOMS-02 Daten : Endbericht zum Vorhaben FKZ 523-4001-1QS90103, MOMS BMBF-DARA (1995)
    Potsdam : Geoforschungszentrum
    Associated volumes
    Details Availability
    Call number: 21/STR 95/25
    In: Scientific technical report
    Type of Medium: GFZ publications
    Pages: 118 S.
    Series Statement: Scientific technical report / Geoforschungszentrum Potsdam 95,25
    Classification:
    Photogrammetry, Remote Sensing
    Location: Reading room
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  • 3
    Electronic Resource
    Electronic Resource
    Mixing synthetic and video images of an outdoor urban environment (1999)
    Springer
    Machine vision and applications 11 (1999), S. 145-159 
    Details
    ISSN: 1432-1769
    Keywords: Key words:Augmented reality – Enriched image sequence – Viewpoint determination – Tracking
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract. Mixing video and computer-generated images is a new and promising area of research for enhancing reality. It can be used in all the situations when a complete simulation would not be easy to implement. Past work on the subject has relied for a large part on human intervention at key moments of the composition. In this paper, we show that if enough geometric information about the environment is available, then efficient tools developed in the computer vision literature can be used to build a highly automated augmented reality loop. We focus on outdoor urban environments and present an application for the visual assessment of a new lighting project of the bridges of Paris. We present a fully augmented 300-image sequence of a specific bridge, the Pont Neuf. Emphasis is put on the robust calculation of the camera position. We also detail the techniques used for matching 2D and 3D primitives and for tracking features over the sequence. Our system overcomes two major difficulties. First, it is capable of handling poor-quality images, resulting from the fact that images were shot at night since the goal was to simulate a new lighting system. Second, it can deal with important changes in viewpoint position and in appearance along the sequence. Throughout the paper, many results are shown to illustrate the different steps and difficulties encountered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001380050098
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  • 4
    Electronic Resource
    Electronic Resource
    Stresses in alumina scales on high-temperature alloys measured by X-ray and optical methods (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 127-130 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  The effect of silicon and titanium on the spallation resistance of alumina scales formed on NiCrAlY-type alloys has been investigated using model alloys with different additions of Si or Ti. For this purpose cyclic oxidation experiments were carried out at temperatures between 950 and 1100 °C. For evaluation of the growth and temperature induced stresses in the oxide scales selected samples were analysed by X-ray stress evaluation (XSE) at ambient temperature after various oxidation treatments. The compressive strains in the scales were found to increase with increasing oxidation time, tending to become constant after longer oxidation times. The strains reduced remarkably, when scale damage, such as cracking, started. The developed strains in the oxide scales appeared to be affected by the microstructure of the alloy and the phase distribution in the subsurface depletion layer beneath the oxide. This distribution is affected by the presence of Si and Ti. Apart from the X-ray method, laser Raman spectroscopy (LRS) was calibrated for strain measurement by XSE results aiming at applying this method for stress analysis at higher temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050362
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  • 5
    Electronic Resource
    Electronic Resource
    Occurrence of Interleukin-6 in Cortical Plaques of Alzheimer's Disease Patients May Precede Transformation of Diffuse into Neuritic Plaques (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 777 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Notes: Interleukin-6 (IL-6) immunoreactivity has previously been shown in plaques in Alzheimer's disease (AD), and elevated IL-6 concentrations have been measured biochemically in brains of AD patients. In this report, we present data on the appearance of IL-6 immunoreactivity in AD plaques according to the stage of plaque formation. Diffuse plaques are found in the early stages of plaque formation, whereas primitive and classic plaques are thought to represent later stages of plaque pathology. We classified plaques using the Bielschowsky silver stain method in serial sections of paraffin-embedded cortices of clinically diagnosed and histopathologically confirmed AD patients and patients with no clinical history of dementia. In the brains of nondemented and demented persons, we found plaques using the silver staining method or immunohistochemistry with antibodies against the amyloid precursor protein. In the nondemented group, diffuse plaques were the predominant plaque type, whereas primitive plaques formed the larger proportion of lesions in the group of AD brains.IL-6 was only detectable in plaques of demented patients. In AD cases, IL-6 was found in a significantly higher ratio in diffuse plaques as would have been expected from a random distribution of IL-6 in all plaque types.We conclude that the presence of IL-6 immunoreactivity correlates with clinically detectable dementia. In addition to the ubiquitous presence of amyloid in nondemented and demented brains, an IL-6-related immunological mechanism may be involved both in the transformation from diffuse to primitive plaques in AD and in the development of dementia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb34420.x
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  • 6
    Electronic Resource
    Electronic Resource
    Depth inhomogeneity of porous silicon layers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 2990-2993 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The two possible causes of depth inhomogeneities of the microstructure of porous silicon are changes in the HF concentration with depth and a varying chemical etching rate of the porous silicon layer. During anodization chemical etching will become important for microporous silicon — e.g. p-porous silicon — due to the large internal surface area, especially at long etching times. On the other hand, a considerable decrease of the HF concentration will occur during etching with high current densities to produce p+-porous silicon with high porosities. We have investigated the depth inhomogeneity of porous silicon layers by spectroscopic ellipsometry, Raman spectroscopy and photoluminescence measurements. From a line shape analysis of the Raman signal a size distribution of nanocrystals is deduced. For p-porous silicon smaller nanocrystals are found near the surface of the layer; for p+-porous silicon etched with high current densities smaller nanocrystals are found near the porous silicon/substrate interface. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363156
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of hydroxypropyl- methylcellulose-stabilized emulsions (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 1019-1023 
    Details
    ISSN: 1435-1536
    Keywords: Key words Hydroxypropylmethylcellulose ; emulsions ; particle size ; active laser scanning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Emulsions stabilized with hydroxypropylmethylcellulose were characterized with respect to their particle size and their flow behavior. This part of the study focuses on the former. Active laser scanning revealed that the particle size is independent of the hydroxymethylcellulose content. The critical density of the surface film was determined to be ≤0.01 g/m2. This is the basis for the interpretation of the flow behavior, which is described in detail in part II of this contribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050341
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  • 8
    Electronic Resource
    Electronic Resource
    Rheological characterization of the dilatant flow behavior of highly substituted hydroxypropylmethyl- cellulose solutions in the presence of sodium lauryl sulfate (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 617-626 
    Details
    ISSN: 1435-1536
    Keywords: Key words Hydroxypropyl-methylcellulose ; sodium lauryl sulfate ; flow behavior ; rheology ; dilatancy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The flow behavior of aqueous solutions of three highly substituted, hydrophobic hydroxypropylmethylcelluloses (HPMC) in mixtures containing the anionic surfactant sodium lauryl sulfate (SLS) was investigated both rheo-mechanically and rheo-optically. For the first time it was possible to demonstrate dilatant flow in these systems, a phenomenon which is otherwise only known of some suspensions and associative thickening solutions. Without addition of SLS, the aqueous HPMC solutions showed the predicted flow behavior of polymer solutions, and the Cox–Merz rule was fulfilled. With the addition of SLS to these HPMC solutions, the least hydrophobic HPMC displayed no dilatancy. The solutions of a more hydrophobic HPMC with SLS exhibited on the one hand an increase in viscosity, and on the other hand shear thinning as well as shear thickening. The most hydrophobic HPMC displayed more clearly the effects of an SLS-dependent viscosity increase and the appearance of dilatant flow. At constant HPMC concentration (0.5% w/w), a maximum increase in viscosity (factor 15) was observed in the critical micelle concentration range for SLS. By rheo-optical measurements it was possible to detect an unusually pronounced alignment of the polymer segments as well as a sharp increase in the birefringence values, even before the macroscopic occurrence of dilatant flow. According to the existing network theories, this behavior of the aqueous solutions of highly substituted HPMCs in mixture with SLS has been interpreted as a shear-induced transition from intra-molecular to intermolecular interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050289
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of hydroxypropylmethyl- cellulose-stabilized emulsions (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 1024-1031 
    Details
    ISSN: 1435-1536
    Keywords: Key words Hydroxypropylmethylcellulose ; emulsions ; stabilization ; flow behavior ; rheometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Emulsions stabilized with hydroxypropylmethylcellulose were characterized with respect to their particle size and their flow behavior. This part of the study focuses on the latter. During shear experiments an increase in viscosity was detected with increasing phase volume fraction. After a critical phase volume fraction, φ, of 0.6 had been exceeded, yield stresses of between 7 and 17 Pa were exhibited. In the emulsions without yield stress the relative emulsion viscosities were examined against the relevant theories, which resulted in good agreement being found with the predictions of Krieger and Dougherty. Using the extrapolated maximum phase volume fraction, it was thus possible to calculate the thickness of the adsorbate layer as approximately 60 nm. In the dynamic measurements, a maximum was determined for the material functions. This was attributed to shear-induced restructuring processes in the emulsions. The dynamic measurements in the linear viscoelastic range showed that, in spite of increasing phase volume fraction, the critical relaxation time decreased, whereas the values of the moduli rose at small oscillation frequencies. Time-dependent measurements showed that thixotropy was detected for emulsions with a phase volume fraction of φ≥0.7. Creep tests showed that the compliance fell with increasing phase volume fraction. The zero shear modulus and the relative elastic compliance were calculated for the emulsions that exhibited yield stresses. Good agreement was found between the zero shear modulus and the values for the storage modulus determined in dynamic measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050342
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  • 10
    Electronic Resource
    Electronic Resource
    Microstructure and mechanical characteristics of alpha-alumina-based fibres (1995)
    Springer
    Journal of materials science 30 (1995), S. 4215-4225 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The high-temperature mechanical behaviour of alumina-based ceramic fibres has been investigated by the comparison of a dense pure alumina fibre, a porous pure alumina fibre and a zirconia-reinforced dense fibre. Tensile and creep tests have been conducted up to 1300°C in air in parallel with microstructural investigations on the as-received and tested fibres. Room-temperature behaviour of the fibres is close to that of bulk materials having the same microstructure, but the fibre form allows higher failure stresses to be attained. High-temperature deformation of the three fibres is achieved by grain-boundary sliding ( $$\dot \varepsilon \propto \sigma ^2 $$ ), and is accompanied by isotropic grain growth. The specific microstructures of each fibre induce differences in the creep threshold levels as a function of temperature and stress and also in creep rates and resistance to damage. Despite better resistance to creep and damage of the zirconia-reinforced fibre, alumina-based fibres are limited to applications below 1100°C. Grain boundaries are the principal cause of mechanical degradation at high temperature with these fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361500
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