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  • 1
    Book
    Book
    A guide to MATLAB® : for beginners and experienced users ; updated for MTLAB® 7 and Simulink® 6 (2007)
    Cambridge [u.a.] : Cambridge Univ. Press
    Details Availability
    Keywords: MATLAB ; MATLAB ; Numerical analysis Data processing ; Hilfswissenschaften ; Engineering Data processing ; Numerical analysis Data processing ; Lehrbuch ; MATLAB 7.0
    Type of Medium: Book
    Pages: XV, 311 S. , graph. Darst., Ill. , 26cm
    Edition: 2. ed., reprinted
    ISBN: 0521615658 , 0521850681 , 9780521850681 , 9780521615655
    URL: https://zbmath.org/?q=an:1103.68146
    URL: http://www.loc.gov/catdir/enhancements/fy0702/2006284264-d.html
    URL: http://www.loc.gov/catdir/enhancements/fy0702/2006284264-t.html
    URL: http://www.gbv.de/dms/bowker/toc/9780521850681.pdf
    RVK:
    ST 601
    Language: English
    Note: Includes index. - Formerly CIP
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  • 2
    Electronic Resource
    Electronic Resource
    NbN/MgO/NbN superconducting tunnel junctions as x-ray detectors (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 653-658 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on our work using NbN/MgO/NbN junctions for the detection of x-rays. Detectors based on superconducting tunneling junctions offer the prospect of energy resolution over an order of magnitude higher than is obtainable with the current generation of semiconductor-based detectors. NbN is interesting due to the possibility of its use in trapping layer devices. The junctions were fabricated at the NASA Jet Propulsion Laboratory (JPL) with an area of 4 µm by 4 µm. They were tested at the Naval Research Laboratory (NRL) in an applied magnetic field of approximately 250 gauss, a current bias of several hundred nanoamps and an operating temperature of 1.7 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693491
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fractal properties of critical invariant curves (1996)
    Springer
    Journal of statistical physics 85 (1996), S. 261-276 
    Details
    ISSN: 1572-9613
    Keywords: Thermodynamic formalism ; fractal dimension ; invariant measure ; circle homeomorphism ; rotation number ; twist map ; critical curve ; renormalization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We examine the dimension of the invariant measure for some singular circle homeomorphisms for a variety of rotation numbers, through both the thermodynamic formalism and numerical computation. The maps we consider include those induced by the action of the standard map on an invariant curve at the critical parameter value beyond which the curve is destroyed. Our results indicate that the dimension is universal for a given type of singularity and rotation number, and that among all rotation numbers, the golden mean produces the largest dimension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02175565
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  • 4
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    Ice matters. Arctic and Antarctic under-ice communities linking sea ice with the pelagic food web (2013)
    In:  EPIC325. Internationale Polartagung, University of Hamburg, 2013-03-17-2013-03-22
    Details
    Publication Date: 2019-07-17
    Description: In both Polar Regions, sea ice environments are undergoing rapid environmental change. Because sea ice constitutes an important habitat for numerous species, as well as an important carbon source during critical periods of the year, these changes impact significantly on ecosystem functioning, biodiversity, species distribution and population sizes, including commercially exploited fish stocks. Species dwelling at the ice-water interface (e.g. Antarctic krill and Arctic cod) play a key role in this context as trophic carbon transmitters from the sea ice into pelagic food webs, and ultimately to the deep sea benthos. Quantifying under-ice communities was hampered in the past by the inaccessibility of the ice underside to conventional sampling gear. Using a new under-ice trawl, it could be shown that Antarctic krill concentrates under sea ice almost year-round, and that krill dwelling under ice are significantly under-estimated by pelagic nets and sonars. An Arctic expedition in 2012 using the same sampling gear brought evidence of a vivid under-ice community even in the biologically poor-considered central Arctic Ocean. Using a bio-environmental sensor array during under-ice fishing enabled fine-scale characterization of sea ice habitat properties as a basis for statistical modeling of under-ice species distribution. During the talk, past results from under-ice fishing in the Southern Ocean will be summarized, and complemented by preliminary results from the Arctic Ocean to elucidate similarities and differences of polar under-ice communities in both hemispheres.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 5
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    Ice matters. Arctic and Antarctic under-ice communities linking sea ice with the pelagic food web (2012)
    In:  EPIC3EUR-OCEANS Flagship for Polar Ecosystem Change and Synthesis (PECS): Identifying key links between biogeochemical processes and foodweb structure, Bremerhaven, Germany, 2012-11-26-2012-11-28
    Details
    Publication Date: 2019-07-17
    Description: A summary of Antarctic and Arctic studies on under-ice fauna is presented in the perspective of the PECS workshop.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 6
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    Sea-ice habitat minimizes grazing impact and predation risk for larval Antarctic krill (2021)
    In:  EPIC3Polar Biology, ISSN: 0722-4060
    Details
    Publication Date: 2021-05-19
    Description: Survival of larval Antarctic krill (Euphausia superba) during winter is largely dependent upon the presence of sea ice as it provides an important source of food and shelter. We hypothesized that sea ice provides additional benefits because it hosts fewer competitors and provides reduced predation risk for krill larvae than the water column. To test our hypothesis, zooplankton were sampled in the Weddell-Scotia Confluence Zone at the ice-water interface (0–2 m) and in the water column (0–500 m) during August–October 2013. Grazing by mesozooplankton, expressed as a percentage of the phytoplankton standing stock, was higher in the water column (1.97 ± 1.84%) than at the ice-water interface (0.08 ± 0.09%), due to a high abundance of pelagic copepods. Predation risk by carnivorous macrozooplankton, expressed as a percentage of the mesozooplankton standing stock, was significantly lower at the ice-water interface (0.83 ± 0.57%; main predators amphipods, siphonophores and ctenophores) than in the water column (4.72 ± 5.85%; main predators chaetognaths and medusae). These results emphasize the important role of sea ice as a suitable winter habitat for larval krill with fewer competitors and lower predation risk. These benefits should be taken into account when considering the response of Antarctic krill to projected declines in sea ice. Whether reduced sea-ice algal production may be compensated for by increased water column production remains unclear, but the shelter provided by sea ice would be significantly reduced or disappear, thus increasing the predation risk on krill larvae.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 7
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    Particulate organic carbon export across the Antarctic Circumpolar Current at 10°E: Differences between north and south of the Antarctic Polar Front (2017)
    In:  EPIC3Deep Sea Research Part II: Topical Studies in Oceanography, 138, pp. 86-101, ISSN: 09670645
    Details
    Publication Date: 2017-05-03
    Description: The vertical distribution of 234Th was measured along the 10°E meridian between 44°S and 53°S in the Antarctic Circumpolar Current (ACC) during the austral summer of 2012. The overarching goal of this work was to estimate particulate organic carbon (POC) export across three fronts: the Sub-Antarctic Front (SAF), the Antarctic Polar Front (APF) and the Southern Polar Front (SPF). Steady state export fluxes of 234Th in the upper 100 m ranged from 1600 to 2600 dpm m−2 d−1, decreasing with increasing latitude. Using large particle (〉53 μm) C/234Th ratios, the 234Th-derived POC fluxes at 100 m ranged from 25 to 41 mmol C m−2 d−1. Observed C/234Th ratios decreased with increasing depth north of the APF while south of the APF, ratios remained similar or even increased with depth. These changes in C/234Th ratios are likely due to differences in the food web. Indeed, satellite images, together with macronutrients and dissolved iron concentrations suggest two different planktonic community structures north and south of the APF. Our results indicate that higher ratios of POC flux at 100 m to primary production occurred in nanophytoplankton dominated surface waters, where primary production rates were lower. Satellite images prior to the expedition suggest that the higher export efficiencies obtained in the northern half of the transect may be the result of the decoupling between production and export (Buesseler 1998). Transfer efficiencies to 400 m, i.e. the fraction of exported POC that reached 400 m, were found to be higher south of the APF, where diatoms were dominant and salps largely abundant. This suggests different remineralization pathways of sinking particles, influencing the transfer efficiency of exported POC to depth.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    Size and stage composition of age class 0 Antarctic krill (Euphausia superba) in the ice-water interface layer during winter/early spring (2016)
    SPRINGER
    In:  EPIC3Polar Biology, SPRINGER, 39(9), pp. 1515-1526, ISSN: 0722-4060
    Details
    Publication Date: 2016-08-30
    Description: The condition and survival of Antarctic krill (Euphausia superba) strongly depends on sea ice conditions during winter. How krill utilize sea ice depends on several factors such as region and developmental stage. A comprehensive understanding of sea ice habitat use by krill, however, remains largely unknown. The aim of this study was to improve the understanding of the krill's interaction with the sea ice habitat during winter/early spring by conducting large-scale sampling of the ice-water interface (0-2 m) and comparing the size and developmental stage composition of krill with the pelagic population (0-500 m). Results show that the population in the northern Weddell Sea consisted mainly of krill that were less than one year old (age class 0; AC0), and that it was comprised of multiple cohorts. Size per developmental stage differed spatially, indicating that the krill likely were advected from various origins. The size distribution of krill differed between the two depth strata sampled. Larval stages with a relatively small size (mean 7 to 8 mm) dominated the upper two meter layer of the water column, while larger larvae and AC0 juveniles (mean 14 to 15 mm) were proportionally more abundant in the 0-500 m stratum. Our results show that, as krill mature, their vertical distribution and utilization of the sea ice appears to change gradually. This could be the result of changes in physiology and/or behaviour, as e.g. the krill's energy demand and swimming capacity increase with size and age. The degree of sea ice association will have an effect on large-scale spatial distribution patterns of AC0 krill and on predictions of the consequences of sea ice decline on their survival over winter.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 9
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    The winter pack-ice zone provides a sheltered but food-poor habitat for larval Antarctic krill (2017)
    Springer Nature
    In:  EPIC3Nature Ecology & Evolution, Springer Nature, 1, pp. 1853-1861, ISSN: 2397-334X
    Details
    Publication Date: 2018-01-03
    Description: A dominant Antarctic ecological paradigm suggests that winter sea ice is generally the main feeding ground for krill larvae. Observations from our winter cruise to the southwest Atlantic sector of the Southern Ocean contradict this view and present the first evidence that the pack-ice zone is a food-poor habitat for larval development. In contrast, the more open marginal ice zone provides a more favourable food environment for high larval krill growth rates. We found that complex under-ice habitats are, however, vital for larval krill when water column productivity is limited by light, by providing structures that offer protec- tion from predators and to collect organic material released from the ice. The larvae feed on this sparse ice-associated food during the day. After sunset, they migrate into the water below the ice (upper 20 m) and drift away from the ice areas where they have previously fed. Model analyses indicate that this behaviour increases both food uptake in a patchy food environment and the likelihood of overwinter transport to areas where feeding conditions are more favourable in spring.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
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    Seasonal changes in the vertical distribution and community structure of Antarctic macrozooplankton and micronekton (2014)
    PERGAMON-ELSEVIER SCIENCE LTD
    In:  EPIC3Deep-Sea Research Part I: Oceanographic Research Papers, PERGAMON-ELSEVIER SCIENCE LTD, 84, pp. 127-141, ISSN: 0967-0637
    Details
    Publication Date: 2019-07-16
    Description: The macrozooplankton and micronekton community of the Lazarev Sea (Southern Ocean) was investigated at 3 depth layers during austral summer, autumn and winter: (1) the surface layer (0–2 m); (2) the epipelagic layer (0–200 m); and (3) the deep layer (0–3000 m). Altogether, 132 species were identified. Species composition changed with depth from a euphausiid-dominated community in the surface layer, via a siphonophore-dominated community in the epipelagic layer, to a chaetognath-dominated community in the deep layer. The surface layer community predominantly changed along gradients of surface water temperature and sea ice parameters, whereas the epipelagic community mainly changed along hydrographical gradients. Although representing only 1% of the depth range of the epipelagic layer, mean per-area macrofauna densities in the surface layer ranged at 8% of corresponding epipelagic densities in summer, 6% in autumn, and 24% in winter. Seasonal shifts of these proportional densities in abundant species indicated different strategies in the use of the surface layer, including both hibernal downward and hibernal upward shift in the vertical distribution, as well as year-round surface layer use by Antarctic krill. These findings imply that the surface layer, especially when it is ice-covered, is an important functional node of the pelagic ecosystem that has been underestimated by conventional depth-integrated sampling in the past. The exposure of this key habitat to climate-driven forces most likely adds to the known susceptibility of Antarctic pelagic ecosystems to temperature rise and changing sea ice conditions.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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