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  • 1995-1999  (1,765)
Collection
Language
Years
Year
  • 1
    Series available for loan
    Series available for loan
    Clausthal-Zellerfeld : Selbstverl. der Geowissenschaftlichen Institute der Techn. Univ. Clausthal
    Associated volumes
    Call number: SR 91.1170(48)
    In: Clausthaler geowissenschaftliche Dissertationen
    Type of Medium: Series available for loan
    Pages: 274 S. + 5 Beil.
    Series Statement: Clausthaler geowissenschaftliche Dissertationen 48
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: AWI G5-97-0004 ; AWI G6-00-0019
    In: Paläoklimaforschung
    Type of Medium: Monograph available for loan
    Pages: XI, 189 S. : graph. Darst., Kt.
    ISBN: 3437308173
    Series Statement: Paläoklimaforschung = Palaeoclimate Research 15 ESF Project "European Palaeoclimate and Man" Special Issue 10
    Branch Library: AWI Library
    Branch Library: AWI Library
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  • 3
    Call number: AWI A4-98-0347
    In: Antarctic research series, Volume 75
    Description / Table of Contents: The Southern Ocean strongly interacts with the atmosphere and with glacial ice, sea ice and the sea floor over the immense and productive Antarctic continental shelf and slope. Water masses transformed and ventilated there subsequently influence the properties and circulation of the deep global ocean. In this latest oceanology volume of the Antarctic Research Series, polar scientists describe and model air-sea and ice-ocean interactions, the formation and chemistry of deep and bottom waters, regional circulations, tidal heights and currents, ocean bathymetry, interannual variability and the Antarctic Slope Front. With international authorship and interdisciplinary scope, this compilation and the related volumes Antarctic Sea Ice physical processes and Antarctic Sea Ice biological processes also cover the impacts of ice crystals and icebergs, sea ice biology and geophysics, and the important roles of sea ice in atmospheric and oceanographic processes.
    Type of Medium: Monograph available for loan
    Pages: XI, 380 Seiten , Illustrationen
    ISBN: 0875909108
    Series Statement: Antarctic research series 75
    Language: English
    Note: Contents: Preface. - Water masses and mixing near the Antarctic slope front. - Observations and modelling of Antarctic downslope flows : a review. - On the interaction of the Katabatic-Land-Sea Wind system of Antarctica with the high latitude Southern Ocean. - Thermohaline variability of the waters overlying the West Antarctica Peninsula Continental Shelf. - Oceanic erosion of a floating Antarctic Glacier in the Amundsen Sea. - Winter atmospheric forcing of the Ross Sea Polynya. - Interannual ocean and sea ice variability in the Ross Sea. - On the Origin and influence of Adélie Land bottom water. - Ocean-Ice shelf interaction and possible bottom water formation in Prydz Bay, Antarctica. - Acoustical techniques in Antarctic Oceanography. - Transport and water masses of the Antarctic slope front system in the Eastern Weddell Sea. - Western Weddell Sea thermohaline stratification. - Transient tracer observations from the western Weddell Sea during the drift and recovery of ice station Weddell. - Interactions between floating ice platelets and ocean water in the Southern Weddell Sea. - Impact of grounded icegergs on the hydrographic conditions near the Filchner Ice shelf. - Physical controls on ocean circulation beneath ice shelves revealed by numerical models. - Ocean circulation beneath the Western Ronne Ice Shelf, as derived from in situ measurements of water currents and properties. - Marine ice beneath Filchner Ice Shelf : evidence from a multi-disciplinary approach. - Tides in the Weddell Sea. - The new bathymetric charts of the Weddell Sea : AWI BCWS
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 4
    Call number: SR 90.1139(1997,27)
    In: UFZ-Bericht
    Type of Medium: Series available for loan
    Series Statement: UFZ-Bericht 1997, 27
    Note: Erscheinungsjahr in Vorlageform:1997-
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 5
    Call number: SR 90.1139(1999,17)
    In: UFZ-Bericht
    Type of Medium: Series available for loan
    Pages: 176 S. : Ill., graph. Darst., Kt. , 30 cm
    Series Statement: UFZ-Bericht Nr. 1999,17
    Note: Erscheinungsjahr in Vorlageform:1999
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 6
    Call number: S 90.0073(91)
    In: Geotektonische Forschungen
    Type of Medium: Series available for loan
    Pages: 156 S.
    ISBN: 3510500571
    ISSN: 0016-8548
    Series Statement: Geotektonische Forschungen 91
    Classification:
    Petrology, Petrography
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Ecosystems 1 (1998), S. 299-309 
    ISSN: 1435-0629
    Keywords: Key words: butterfly; phenology; topoclimate; insolation; Geographic Information System (GIS); spatially explicit; weather; insect.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: ABSTRACT Phenology of organismal development varies between growing seasons according to the weather and also varies within growing seasons across topoclimatic gradients. Combining these factors is necessary to predict landscape-level patterns of phenology and their consequences for population dynamics. We developed a model on a Geographic Information System (GIS) that predicts phenology of adult emergence of the threatened Bay checkerspot butterfly across complex terrain under variable weather. Physiological time was modeled by accumulated slope-specific direct insolation. Insolation sums through growing seasons were calculated for each cell of a digital terrain model (skipping over cloudy days) until a threshold for adult emergence was reached. Emergence times of adult butterflies for a given year were then mapped out across a 100-ha area. To generate predicted emergence curves for the population in a given year, these maps ofemergence times were then modified by incorporating microdistributions of postdiapause larvae. Different larval microdistributions changed both the magnitude and shape of emergence curves under the same yearly weather and could change mean population-wide emergence dates by 11 days. Reproductive success in this butterfly is strongly dependent on the timing of adult emergence, and these models provide insights into the effects of weather, topography, and population history on population dynamics. Because adult emergence phenology is often a key component of reproductive success for insects, understanding the components of phenological variation in space and time in complex terrain may provide insights into population dynamics for management of pests and conservation of rare species.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Mathematics of control, signals, and systems 10 (1997), S. 287-330 
    ISSN: 1435-568X
    Keywords: Regular linear system ; Optimal cost operator ; Riccati equation ; Popov function ; Spectral factor ; Feedthrough operator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics , Technology
    Notes: Abstract The paper extends quadratic optimal control theory to weakly regular linear systems, a rather broad class of infinite-dimensional systems with unbounded control and observation operators. We assume that the system is stable (in a sense to be defined) and that the associated Popov function is bounded from below. We study the properties of the optimally controlled system, of the optimal cost operatorX, and the various Riccati equations which are satisfied byX. We introduce the concept of an optimal state feedback operator, which is an observation operator for the open-loop system, and which produces the optimal feedback system when its output is connected to the input of the system. We show that if the spectral factors of the Popov function are regular, then a (unique) optimal state feedback operator exists, and we give its formula in terms ofX. Most of the formulas are quite reminiscent of the classical formulas from the finite-dimensional theory. However, an unexpected factor appears both in the formula of the optimal state feedback operator as well as in the main Riccati equation. We apply our theory to an extensive example.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Plant ecology 143 (1999), S. 107-122 
    ISSN: 1573-5052
    Keywords: Constrained ordination ; Disturbances ; Logistic regression ; Model comparison ; Plant distribution ; Spatial modeling ; Spring Mountains (Nevada)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Despite the variety of statistical methods available for static modeling of plant distribution, few studies directly compare methods on a common data set. In this paper, the predictive power of Generalized Linear Models (GLM) versus Canonical Correspondence Analysis (CCA) models of plant distribution in the Spring Mountains of Nevada, USA, are compared. Results show that GLM models give better predictions than CCA models because a species-specific subset of explanatory variables can be selected in GLM, while in CCA, all species are modeled using the same set of composite environmental variables (axes). Although both techniques can be readily ported to a Geographical Information System (GIS), CCA models are more readily implemented for many species at once. Predictions from both techniques rank the species models in the same order of quality; i.e. a species whose distribution is well modeled by GLM is also well modeled by CCA and vice-versa. In both cases, species for which model predictions have the poorest accuracy are either disturbance or fire related, or species for which too few observations were available to calibrate and evaluate the model. Each technique has its advantages and drawbacks. In general GLM will provide better species specific-models, but CCA will provide a broader overview of multiple species, diversity, and plant communities.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 1999-08-01
    Print ISSN: 0022-4928
    Electronic ISSN: 1520-0469
    Topics: Geography , Geosciences , Physics
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