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  • Electronic Resource  (4)
  • 1995-1999  (4)
  • 1980-1984
  • 1997  (4)
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  • Electronic Resource  (4)
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  • 1995-1999  (4)
  • 1980-1984
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  • 1
    Electronic Resource
    Electronic Resource
    Electron microscopic characterization of SrTiO3 films obtained by anodic spark deposition (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 105-107 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Crystalline strontium titanate layers were deposited on titanium anodes from Sr(OH)2 aqueous electrolyte solutions by a plasmachemical-electrochemical process of anodic spark deposition. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) have been used to study the properties of the polycrystalline material. Strontium titanate was deposited on the titanium anode surface as a ceramic layer from an aqueous electrolyte. The typical pore structure morphology of the anodic spark deposit (ASD) was characterized by SEM as well as fractures which provide an intimate contact between layer and substrate. XRD-study showed that the layers are composed of a mixture of SrTiO3 and TiO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050356
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Organophosphates in the Zebra Mussel Dreissena polymorpha: Subacute Exposure, Body Burdens, and Organ Concentrations (1997)
    Springer
    Archives of environmental contamination and toxicology 33 (1997), S. 42-46 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. Subacute exposures (10 d) of the freshwater mollusc Dreissena polymorpha to disulfoton (10 mg/L), thiometon (6 mg/L), and its activated oxygen analogue demeton-S-methyl (6 mg/L) corroborate earlier findings of organophosphate resistance and accumulation in the organism. Mortality occurred not before the ninth day of exposure. Mortality was induced at high ambient water concentrations and must be due to unknown specific organophosphate effects. Body burdens reached saturation levels within one week being around 40 mg/kg wet weight for thiometon and 60 mg/kg for disulfoton. Mussels dying during the tests showed lower tissue concentrations. Elimination of accumulated organophosphates was so low in the mussel, that an efficient metabolism of these compounds in the mussel was unlikely. Different organs of Dreissena previously acutely exposed (96 h) to the organophosphate thiometon (6, 12, 25, 50 mg/L) were analyzed for their thiometon content. Thiometon could be found in all organs, but were highest in the anterior part of the viscera (230 mg/kg), where it was accumulated either in the digestive gland and/or in the gonadal tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900221
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Propsychotische Veränderung der binokulären Tiefeninversion durch Schlafentzug (1997)
    Springer
    Der Nervenarzt 68 (1997), S. 593-596 
    Details
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Visuelle Illusionen ; Schlafentzug ; Key words Visual illusions ; Sleep deprivation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Binocular depth inversion represents an illusion of visual perception. Such inversion does not occur in all cases, especially when objects with a higher degree of familiarity (e.g. photographs of faces) are displayed. Cognitive factors are assumed to override the binocular disparity cues of stereopsis. We tested the hypothesis that during sleep deprivation the human CNS is unable to correct the implausible perceptual information. Measurements of binocular depth inversion in perception of 3D objects were taken in sleep-deprived medical staff and healthy volunteers. The binocular depth inversion scores were highly elevated in the sleep-deprived group in comparison to the healthy volunteers. The data demonstrate a strong impairment of binocular depth inversion after sleep deprivation and support the view that sleep deprivation may be accompanied by a disorganisation of the interaction between sensory input and generation of perceptual hypotheses.
    Notes: Zusammenfassung Bei der Tiefeninversion handelt es sich um eine optische Illusion, die in Abhängigkeit vom präsentierten Objekt auftritt. Dabei wird die räumliche Tiefeninformation durch kognitive Faktoren in einem kritischen Interaktionsprozeß„überarbeitet”. In dieser Studie wird untersucht, ob durch Schlafentzug das ZNS dahingehend beeinfluß werden kann, implausible visuelle Information insuffizient zu korrigieren. In einem Tiefeninversionsparadigma wurde die Wahrnehmung von 3-D-Objekten bei nachtschichtig arbeitendem medizinischem Personal und gesunden Kontrollprobanden untersucht. Der Tiefeninversionsscore war bei den Schlafentzügigen im Vergleich zu den Kontrollprobanden deutlich erhöht. Die Daten verdeutlichen eine Beeinträchtigung der binokulären Tiefeninversion im Schlafentzug, möglicherweise hervorgerufen durch eine Störung der Interaktion zwischen visueller Perzeption (Bottom-up-Komponente) und der Generierung von Wirklichkeitshypothesen (Top-down-Komponente).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001150050167
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A high resolution numerical study of Gulf of Mexico fronts and eddies (1997)
    Springer
    Meteorology and atmospheric physics 64 (1997), S. 187-201 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary The Gulf of Mexico (GOM) circulation is simulated using the DieCAST ocean model, with a horizontal resolution of 1/12° and 20 vertical layers. The results compare well with observations of both large and small scale features, including Loop Current frontal occlusions associated with frontal eddies. The simulation is carried out without any data assimilation. The frontal eddies tend to be spaced at about 90° intervals around the Loop Current, leading to a Loop Current head shaped like a square with rounded corners. The pattern rotates as the eddies circle the Loop, and frontal eddies elongate as they squeeze through the Florida Strait. Major warm core eddies separate regularly from the Loop Current and propagate to the western GOM. Old warm core eddies in the western Gulf dissipate through bottom drag effects, which also generate cyclonic parasitic eddies. Newly arrived warm core eddies merge with old ones in the western GOM. Recently separated elongated Loop Current eddies can rotate and reattach temporarily to the Loop Current. The barotropic flow component develops eddies between the main separated warm core eddy and the Loop Current due to eastward dispersion, as the main eddy itself propagates westward into the Gulf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029692
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    Paper (German National Licenses)
    Fulltext
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