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  • Electronic Resource  (8)
  • 1995-1999  (8)
  • 1998  (4)
  • 1997  (4)
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  • Electronic Resource  (8)
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  • 1995-1999  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    ESCA investigations on pyrolytic carbon films for fiber coatings (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 601-602 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Photoelectron spectroscopy on pyrolytic carbon films revealed a main part of carbon atoms in graphitic planes and a smaller part of functional groups with oxygen bonded to carbon atoms. Oxygen totalled a share of 10 at% and more of the carbon coating. The films with a turbostratic structure consist of nearly parallel oriented atomic layers of hexagonal rings with dimensions in the nanometer scale, which is well known from HREM investigations. The oxygen atoms are proposed to saturate the numerous dangling bonds around these individual atomic planes. The oxygen atoms form double bonds or bridges between carbon atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050962
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  • 2
    Electronic Resource
    Electronic Resource
    SEM-, EDS- and GDOES investigations for the identification of historical ferrous ore and slag from Sternmühlenthal valley in the outskirts of Chemnitz (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 701-703 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract SEM, EDS and GDOES investigations on ferrous ore and slag samples contribute to the local history of mining and metallurgy. Quantitative X-ray analysis confirms the ore to be limonite. The slag consists of fayalithe and incompletely reduced ore parts (iron scale). Additional calcium and charcoal inclusions were reactants of the bloomery process. The charcoal shows anatomical details of spruce (Picea abies (L.) Karst.). A multitude of typical trace elements was detected by GDOES both in ore and slag samples. The comparison of normalised GDOES signals for a series of constituents showed that the ore from the assumed deposit (Euba) was processed in the location (Sternmühlenthal), where the slag was discarded. The process was probably performed in the 17th century.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050998
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    XPS investigations on boron nitride fibre coatings prepared by chemical vapour deposition in comparison to their hydrolytic rate (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 653-655 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Investigations on CVD boron nitride films on fibres by means of photoelectron and X-ray spectroscopy resulted in B/N ratios above the stoichiometric value 1 and oxygen contents up to 25 at%. Compared to the hydrolytic rate of the films an apparent dependence was found on the deposition rate and some evidence of the oxygen concentration. CVD fibre coatings exhibit a hexagonal turbostratic structure with extremely small atomic layer plane dimensions, which was proved by transmission electron microscopy. Corresponding to oxygen concentrations in pyrolytic carbon films with similar structure a model is proposed, where the small atomic layers with dimensions of some nanometers cause a relatively high oxygen concentration in the boron nitride films. The oxygen atoms saturate the dangling bonds. Moreover the B/N ratio extents the expected stoichiometric ratio due to the oxygen atoms at nitrogen sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050982
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Microstructure and composition of silicon carbide films deposited on carbon fibers by chemical vapor deposition (1998)
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 568-569 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The microstructure and the composition of CVD silicon carbide films used as fiber coatings in composite materials were investigated by photoelectron spectroscopy and transmission electron microscopy. The films with a uniform thickness of 50 nm consisted of small SiC grains with a mean diameter of 15 nm and showed a stripe contrast in bright field images. Large grains with diameters in the dimension of the film thickness were used for imaging the lattice structure by high-resolution electron microscopy. The results are discussed as a polytype of cubic lamellae of a few nanometers and intermediate random stacking sequences of hexagonal structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050950
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  • 6
    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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  • 7
    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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  • 8
    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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