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  • 1
    Electronic Resource
    Electronic Resource
    On the origin of stationary concentration patterns in the H2+O2 reaction on a microstructured Rh(110)/Pt surface with potassium (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 117 (2002), S. 2923-2933 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The formation of stationary concentration patterns that develop in the O2+H2 reaction on a microstructured Rh(110)/Pt surface predosed with potassium (θK(approximate)0.08) has been investigated with photoelectron emission microscopy and scanning photoelectron microscopy. The reaction was studied in the 10−7 and 10−6 mbar range between T(approximate)500–600 K on a Rh(110) surface onto which a square-shaped Pt domain of 70×70 μm2 size and 70 Å thickness had been deposited in UHV. Two types of Pt domains, one with pure Pt and one with Rh alloying, were prepared. The chemical state of the metallic substrate and of the adsorbate layers were characterized in situ by local (spot size 0.15 μm) photoelectron spectra of the Pt 4f, Rh 3d, K 2p and O 1s levels. Stationary concentration patterns consisting of K+O condensation islands of macroscopic size developed on both types of Pt domains under reaction conditions. On the alloyed Pt patch the formation of the large K+O condensation islands was associated with the reversible local segregation of Rh. The K+O condensation is interpreted as primary pattern forming process, while the segregation of Rh is a secondary process, which follows the distribution of oxygen resulting from the primary process. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1491408
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  • 2
    Electronic Resource
    Electronic Resource
    Transport mechanisms during spreading of MoO3 on Al2O3 supports investigated by photoelectron spectromicroscopy (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 5440-5446 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The initial stage of spreading of micron-sized MoO3 crystals deposited on a flat Al2O3 support have been studied by synchrotron radiation spectromicroscopy. The lateral resolution of 150 nm and the surface sensitivity of the microscope allowed us to detect submonolayer quantities of Mo–oxide, spread on the support in the vicinity of the MoO3 crystals after annealing in oxygen atmosphere. Detailed analyses of the Mo–oxide wetting the support have been performed combining chemical imaging with spectroscopy. The concentration of the spread Mo–oxide was quantified as a function of the distance from the MoO3 crystals. The determined concentration profiles were fitted to the analytical solution of an equivalent diffusion model for the MoO3 mass transport in dry oxygen at 630 K yielding a diffusion constant of D=7.8×10−11 cm2/s. The results are discussed in the framework of the possible mass transport mechanisms causing the spreading. The simple unrolling carpet was ruled out as an active process. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481111
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of feeding under-year zander (Sander lucioperca) on size, body mass and body composition before and after wintering (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 21 (2005), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Zander (Sander lucioperca) is one of the most important fish species in the German inland fishery. As a pelagic predator, zander is able to regulate populations of small cyprinids and perch and is therefore used in ‘top-down’ projects to directly control the food web. At present, natural waters are mainly stocked with one-summer-old zander from pond hatcheries; however, such fish are poor stocking material due to low survival rates, presumably because of their small size. Two groups of 50-day-old zander fingerlings reared in a recirculation system (T = 23 °C) were used. For 90 days one group (FG 1) was fed with a commercial dry feed (Trouvit Pro Aqua Brut), and the other group (FG 2) was fed with chironomides (Chironomus spp.). The fat content of the dry feed was increased with fish oil supplemented up to 22%. After the rearing period the FG 1 fishes attained the largest size and fat content. A pond with a surface of 667 m2 and a mean depth of 0.8 m was stocked with 24-tagged zander (12 of each feeding group) for wintering. After the winter period of 176 days, survival rate of each feeding group was 83.3%. The fatty acid composition in the membrane lipids of group 2 changed dramatically. In contrast to previous investigations, presented results indicate that the survival rate is not influenced by fish size (weight and length). The crucial factors for high survival rates of zander during wintering are the crude tissue fat content (〉5%) and its fatty acid composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2005.00665.x
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