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  • 1
    Monograph available for loan
    Monograph available for loan
    Leipzig [u.a.] : Teubner
    Call number: 719 / Regal 12
    Type of Medium: Monograph available for loan
    Pages: VI, 218 S. : Ill.
    Edition: 2. Aufl.
    Location: Archive - must be ordered
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 102 (1980), S. 7566-7567 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 83 (1984), S. 205-217 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Productivity was studied in two diatom species, Chaetoceros armatum T. West and Asterionella socialis Lewin and Norris, which form persistent dense blooms in the surf zone along the Pacific coast of Washington and Oregon, USA. Past observations have shown that surf-diatom standing stock usually declines in summer along with concentrations of nitrate and ammonium. Using the 14C method, photosynthetic rates in natural surf samples were measured monthly for one year (October 1981 through September 1982) at a study site on the Washington coast. Also measured were temperature, salinity, dissolved nutrients, particulate carbon and nitrogen (used as estimates of phytoplankton C and N), and chlorophyll a. Assimilation numbers (P max) were higher in summer (5 to 8 g C g-1 chl a h-1) than in winter (3 to 4gC). Specific carbon incorporation rates (µ′max) showed no obvious seasonality, mostly falling within the range of 0.09 to 0.13 g C g-1 C(POC) h-1. The discrepancy between the seasonal trends for chlorophyll-specific and carbon-specific rates reflects a change in the carbon-to-chlorophyll ratio. Because of seasonal differences in daylength and light intensity, daily specific growth rates (μ) are thought to be higher in summer than in winter. Neither ammonium enrichment assays nor particulate carbon-to-nitrogen ratios provided convincing evidence for nitrogen limitation during summer, and the observed changes in diatom abundance cannot be explained on this basis. Both the high diatom concentrations and their seasonal variations probably are due mainly to factors other than growth rates; two factors considered important are diatom flotation and seasonal changes in wind-driven water transport. C. armatum usually dominates the phytoplankton biomass in the surf zone, and evidence suggests that this species is strongly dominant in terms of primary production.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0630
    Keywords: PACS: 68.55-a; 77.80-e; 81.15.Fg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Thin films of bismuth-layered perovskites such as SrBi2Ta2O9, Bi4Ti3O12, and BaBi4Ti4O15 with preferred orientations were grown by pulsed laser deposition on epitaxial conducting LaNiO3 electrodes on single-crystalline (100) SrTiO3 or on top of epitaxial buffer layers on (100) silicon. A morphology and structure investigation by X-ray diffraction analysis, scanning probe microscopy, and scanning and transmission electron microscopy showed that the films consisted of both c-axis-oriented regions and mixed (110)-, (100)-, and (001)-oriented regions. The regions with mixed orientation featured rectangular as well as equiaxed crystalline grains protruding out of a smooth c-oriented background. A closer examination revealed that the regions with mixed orientation actually consisted of a c-axis-oriented sublayer growing directly on the epitaxial LaNiO3 electrode, on top of which the growth of either (110)-, (100)-, or (001)-oriented grains took place. Macroscopic as well as microscopic measurements of the ferroelectric properties of regions with pure c-orientation and of regions with mixed orientations showed a clear relationship between their ferroelectric properties and their morphology and crystallographic orientation. In the regions with mixed orientation, the films exhibited saturated ferroelectric hysteresis loops with well-defined remnant polarisation Pr and coercive field Ec. The regions having c-axis orientation with a smooth surface morphology in contrast exhibited a linear P-E curve with no hysteretic behaviour for SrBi2Ta2O9 and BaBi4Ti4O15 and a weak ferroelectric behaviour for Bi4Ti3O12. This clearly showed that the ferroelectric properties of bismuth-layered ferroelectric oxides depended on the crystalline orientation of the film and that the observed ferroelectric hysteresis loops in SrBi2Ta2O9 and BaBi4Ti4O15 films were solely due to the (100)- and (110)-oriented grains. The size of the (110)- and (100)-oriented grains being of the order of 100 nm and spontaneous polarisation having been observed and switched in a controlled manner is a demonstration that ferroelectricity can exist in structures of submicrometer size. These results might have a technological impact due to the relevance of bismuth-layered ferroelectric oxides for the fabrication of non-volatile FeRAM memories.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 1169-1175 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A refined view of particle stimulated nucleation of recrystallization is presented, whichutilizes a combination of advanced modeling tools. FEM simulations were carried out in order tomodel the evolution of the deformation zone around particles for various particle sizes and shapes.The results of these simulations were complemented by EBSD measurements to determine thenumber and orientation of nuclei. Finally, this information on particle stimulated nucleation wasincorporated into a 3D cellular automaton recrystallization model CORe to model microstructureevolution. From these simulations the dependence of grain size and texture on particles size andshape was derived
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 550 (July 2007), p. 85-94 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The predictions from a grain cluster deformation texture model, GIA, are utilized to studythe nucleation texture of recrystallisation of aluminium alloys. In combination with a dislocationbased work hardening model, the propensity of specific grains in their granular environment forselect nucleation mechanisms is investigated. Quantitative criteria for the nucleation events can beformulated. The results can be fed into a growth model of recrystallisation to predictrecrystallisation textures and lend themselves to through-process modelling
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 79-82 (Jan. 1991), p. 419-426 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Gene Structure and Expression 951 (1988), S. 351-358 
    ISSN: 0167-4781
    Keywords: DNA replication,in vitro ; DnaA protein ; Gene repression ; Transcription termination ; asnC ; mioC ; oriC
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Gene 73 (1988), S. 347-354 
    ISSN: 0378-1119
    Keywords: Initiation of replication ; autoregulation ; galK-expression plasmid ; mioC ; oriC ; recombinant DNA
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 441-449 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A displacement sensor was constructed to monitor the motion of a piezoelectric Doppler velocity transducer in a gravitational redshift experiment with 67Zn Mössbauer resonance. The sensor uses a dc superconducting quantum interference device (SQUID) to detect small displacements of a permanent magnet. To meet the stringent requirements of the redshift experiment, the magnetic flux gradient and the pickup coil of the sensor are designed in such a way that the SQUID flux noise of 7 × 10−6 Φ0/(square root of)Hz corresponds to a displacement resolution of 6 × 10−14 m/(square root of)Hz. However, resolution up to 3 × 10−15 m/(square root of)Hz in the frequency band of 20–20 000 Hz is demonstrated. The linearity of the displacement sensor and the piezoelectric transducer are considered in detail and the resulting uncertainties associated with the Doppler modulation in the Mössbauer experiment are evaluated.
    Type of Medium: Electronic Resource
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