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  • 1
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    Unbekannt
    The Empirical Modeling of an Ecosystem (2021)
    In:  http://aquaticcommons.org/id/eprint/2003 | 130 | 2010-12-14 16:47:47 | 2003
    Details
    Publikationsdatum: 2021-07-11
    Beschreibung: The authors have endeavored to create a verified a-posteriori model of a planktonic ecosystem. Verification of an empirically derived set of first-order, quadratic differential equations proved elusive due to the sensitivity of the model system to changes in initial conditions. Efforts to verify a similarly derived set of linear differential equations were more encouraging, yielding reasonable behavior for half of the ten ecosystem compartments modeled. The well-behaved species models gave indications as to the rate-controlling processes in the ecosystem.
    Beschreibung: UMCES (University of Maryland Center for Environmental Science); Contribution No. 799
    Schlagwort(e): Ecology ; Models ; Ecosystems
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 29-40
    Standort Signatur Erwartet Verfügbarkeit
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    ARTIKEL (OA)
  • 2
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    Unbekannt
    Effects of perturbations on estuarine microcosms (2021)
    University of South Carolina Press | Columbia, SC
    In:  http://aquaticcommons.org/id/eprint/2006 | 130 | 2010-12-14 16:47:58 | 2006 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-11
    Beschreibung: Microcosms containing planktonic communities from ChesapeakeBay responded to enrichment with sewage by developing larger standing crops of phytoplankton and zooplankton. Data suggest that increased productivity would be reflected up the food chain but might increase existing problems with dissolved oxygen and might lead to qualitative changes in the composition of the zooplankton.Either phosphorus or nitrogen was removed more rapidly fromsolution depending on where and when the experimental water was obtained. Increases in standing crop of algae were associated with loss of nitrogen from solution in two experiments and losses of both nitrogen and phosphorus from solution in one experiment.
    Beschreibung: UMCES Contribution No. 803
    Schlagwort(e): Ecology ; Eutrophication ; Chesapeake Bay ; dissolved oxygen ; Univ. of Md. Center for Environmental Science- CBL
    Repository-Name: AquaDocs
    Materialart: book_section , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 119-141
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Temperature dependence of the transverse lasing mode in vertical-cavity lasers (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 2279-2286 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Experimental data are presented along with calculations which describe the near-threshold transverse modes in AlAs/GaAs/InGaAs vertical-cavity surface-emitting lasers with two different Bragg reflector systems. The Bragg reflector systems are composed of either AlAs/GaAs quarter-wave stacks or a combination of AlAs/GaAs and ZnSe/CaF. The temperature dependence of the lasing mode is studied for three different structures, and it is shown that higher-order lasing modes are favored with strong cavity detuning when the cavity resonance exists at a wavelength greater than the bulk emission peak. Important aspects of the lasing behavior are described by calculating the spontaneous mode which occurs at the lasing wavelength. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.358816
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    DENSITY AND HAUL-OUT BEHAVIOR OF LEOPARD SEALS (HYDRURGA LEPTONYX) IN PRYDZ BAY, ANTARCTICA (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 13 (1997), S. 0 
    Details
    ISSN: 1748-7692
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: The spatial distribution of leopard seals along the fast-ice edge in the austral spring and summer of 1992 and 1993 in Prydz Bay, Antarctica, was determined by aerial surveys. Fewer individuals were observed within the area, and the seals observed were larger, in 1992 than in 1993. Comparison of the distributions and relative sizes of the seals suggests that there may be an age-related difference in spatial behavior. The greater degree of separation among older seals may be due to intraspecific aggression increasing with age, a hypothesis supported by the high incidence of intraspecific scarring noted on leopard seals in this region. The seals’haul-out behavior was negatively related to wind-chill index.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1748-7692.1997.tb00632.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    BEHAVIORAL SIGNIFICANCE OF UNDERWATER VOCALIZATIONS OF CAPTIVE LEOPARD SEALS, HYDURGA LEPTONYX (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 12 (1996), S. 0 
    Details
    ISSN: 1748-7692
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Two groups of underwater vocalizations were identified in a three-year study of two captive leopard seals, Hydurga leptonyx (one female and one male at Taronga Zoo, Sydney). This was supplemented by recordings over three months from a male at Marineland, New Zealand. The sexual state of the seals at Taronga was deduced from serum hormonal concentrations: the female was considered to be in estrus at specific times during the breeding season. The seal at Marineland, New Zealand was assumed to be sexually mature on the basis of size and age. Of 12 different underwater sound types recorded, six were produced by the seals at Taronga Zoo during agonistic interactions (local calls) and were heard through most of the year. The other six sound types were produced by lone seals. These broadcast calls were produced by the female only when sexually receptive, and by the mature male during December and January, months believed to be the breeding season of wild leopard seals. We propose that underwater acoustic behavior is important in the mating system of this species, and that broadcast calls are used by mature females to advertise their sexual receptivity, and possibly by mature males in search of mates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1748-7692.1996.tb00593.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    ACOUSTIC OBSERVATIONS OF ARNOUX'S BEAKED WHALE (BERARDIUS ARNUXII) OFF KEMP LAND, ANTARCTICA (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 15 (1999), S. 0 
    Details
    ISSN: 1748-7692
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1748-7692.1999.tb00789.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    The Molecular Biology of the Na+-Ca2+ Exchanger and Its Functional Roles in Heart, Smooth Muscle Cells, Neurons, Glia, Lymphocytes, and Nonexcitable Cellsa (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 779 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb44764.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Electrogenemtion of Mn(III) in an undivided cell (1983)
    Springer
    Journal of applied electrochemistry 13 (1983), S. 535-540 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The electrochemical oxidation of manganous ion to manganic ion in acetic acid may be efficiently carried out in a parallel plate undivided cell. Reduction of manganic ion to manganous ion at the cathode is a relatively inefficient reaction, allowing the formation of solutions of manganic ion as high as 0.05 mol dm−3, at greater than 80% current efficiency. The effects of the major variables have been evaluated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00617527
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Singular stress layers in ideal fibre-reinforced cylinders (1978)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 29 (1978), S. 237-244 
    Details
    ISSN: 1420-9039
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Beschreibung / Inhaltsverzeichnis: Summary The paper demonstrates the existence of singular stress layers in normal cross-sections of helically reinforced hollow cylinders. The material is assumed to be an ideal fibre-reinforced material. The theory is illustrated by its application to the problem of a linear elastic, balanced angle-ply cylinder which is ringclamped at both ends and subjected to internal pressure.
    Notizen: Zusammenfassung Diese Arbeit zeigt das Bestehen singulärer Spannungsflächen in achsennormalen Querschnitten von spiralfaserverstärkten Hohlzylindern. Es wird angenommen, dass der Werkstoff ideal faserverstärkt ist. Als Beispiel der Anwendung der Theorie wird das Problem eines linear-elastischen gleichwinklig gelegten Zylinders behandelt, der an beiden Enden ringförmig gelagert und mit Innendruck belastet ist.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01601518
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Breakdown of Paraffin Wax by Bacteria: A Source of Error in Corrosion Tests (1943)
    [s.l.] : Nature Publishing Group
    Nature 152 (1943), S. 105-106 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN work carried out by the British Non-Ferrous Metals Research Association on the corrosion of metals by domestic waters, glassware used for sampling water and for carrying out corrosion tests was coated with paraffin wax to prevent pick-up of alkali silicates. Tests carried out in waxed ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/152105b0
    Standort Signatur Erwartet Verfügbarkeit
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