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  • 1
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Food chains (Ecology). ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (616 pages)
    Edition: 1st ed.
    ISBN: 9780080460949
    Series Statement: Issn Series ; v.Volume 3
    Language: English
    Note: front cover -- copyright -- table of contents -- front matter -- Contributors -- body -- 1.0 | TRIBUTE -- 1.1 | DYNAMIC FOOD WEBS -- 1.2 | FOOD WEB SCIENCE: MOVING ON THE PATH FROM ABSTRACTION TO PREDICTION -- 2.0 | VARIATIONS IN COMMUNITY ARCHITECTURE AS STABILIZING MECHANISMS OF FOOD WEBS -- 2.1 | FROM FOOD WEBS TO ECOLOGICAL NETWORKS: LINKING NON-LINEAR TROPHIC INTERACTIONS WITH NUTRIENT COMPETITION -- 2.2 | FOOD WEB ARCHITECTURE AND ITS EFFECTS ON CONSUMER RESOURCE OSCILLATIONS IN EXPERIMENTAL POND ECOSYSTEMS -- 2.3 | FOOD WEB STRUCTURE: FROM SCALE INVARIANCE TO SCALE DEPENDENCE, AND BACK AGAIN? -- 2.4 | THE ROLE OF SPACE, TIME, AND VARIABILITY IN FOOD WEB DYNAMICS -- 3.0 | POPULATION DYNAMICS AND FOOD WEBS: DRIFTING AWAY FROM THE LOTKA-VOLTERRA PARADIGM -- 3.1 | MODELLING EVOLVING FOOD WEBS -- 3.2 | THE INFLUENCE OF INDIVIDUAL GROWTH AND DEVELOPMENT ON THE STRUCTURE OF ECOLOGICAL COMMUNITIES -- 3.3 | LINKING FLEXIBLE FOOD WEB STRUCTURE TO POPULATION STABILITY: A THEORETICAL CONSIDERATION ON ADAPTIVE FOOD WEBS -- 3.4 | INDUCIBLE DEFENSES IN FOOD WEBS -- 4.0 | WEARING ELTON'S WELLINGTONS: WHY BODY SIZE STILL MATTERS IN FOOD WEBS -- 4.1 | SPECIES' AVERAGE BODY MASS AND NUMERICAL ABUNDANCE IN A COMMUNITY FOOD WEB: STATISTICAL QUESTIONS IN ESTIMATING THE RELATIONSHIP -- 4.2 | BODY SIZE SCALINGS AND THE DYNAMICS OF ECOLOGICAL SYSTEMS -- 4.3 | BODY SIZE, INTERACTION STRENGTH, AND FOOD WEB DYNAMICS -- 4.4 | BODY SIZE DETERMINANTS OF THE STRUCTURE AND DYNAMICS OF ECOLOGICAL NETWORKS: SCALING FROM THE INDIVIDUAL TO THE ECOSYSTEM -- 5.0 | UNDERSTANDING THE MUTUAL RELATIONSHIPS BETWEEN THE DYNAMICS OF FOOD WEBS, RESOURCES, AND NUTRIENTS -- 5.1 | VARIABILITY IN SOIL FOOD WEB STRUCTURE ACROSS TIME AND SPACE -- 5.2 | FUNCTIONAL ROLES OF LEAF LITTER DETRITUS IN TERRESTRIAL FOOD WEBS. , 5.3 | STABILITY AND INTERACTION STRENGTH WITHIN SOIL FOOD WEBS OF A EUROPEAN FOREST TRANSECT: THE IMPACT OF N DEPOSITION -- 5.4 | DIFFERENTIAL EFFECTS OF CONSUMERS ON C, N, AND P DYNAMICS: INSIGHTS FROM LONG-TERM RESEARCH -- 5.5 | MEASURING THE ABILITY OF FOOD TO FUEL WORK IN ECOSYSTEMS -- 5.6 | TOWARDS A NEW GENERATION OF DYNAMICAL SOIL DECOMPOSER FOOD WEB MODELS -- 6.0 | FOOD WEBS, BIODIVERSITY, AND ECOSYSTEM FUNCTIONING -- 6.1 | FOOD WEBS AND THE RELATIONSHIP BETWEEN BIODIVERSITY AND ECOSYSTEM FUNCTIONING -- 6.2 | BIODIVERSITY, FOOD WEB STRUCTURE, AND THE PARTITIONING OF BIOMASS WITHIN AND AMONG TROPHIC LEVELS -- 6.3 | TROPHIC POSITION, BIOTIC CONTEXT, AND ABIOTIC FACTORS DETERMINE SPECIES CONTRIBUTIONS TO ECOSYSTEM FUNCTIONING -- 6.4 | DOES BIOLOGICAL COMPLEXITY RELATE TO FUNCTIONAL ATTRIBUTES OF SOIL FOOD WEBS? -- 6.5 | DIVERSITY, PRODUCTIVITY, AND INVASIBILITY RELATIONSHIPS IN ROCK POOL FOOD WEBS -- 6.6 | MEASURING THE FUNCTIONAL DIVERSITY OF FOOD WEBS -- 7.0 | TRACING PERTURBATION EFFECTS IN FOOD WEBS: THE POTENTIAL AND LIMITATION OF EXPERIMENTAL APPROACHES -- 7.1 | INSIGHT INTO POLLUTION EFFECTS IN COMPLEX RIVERINE HABITATS: A ROLE FOR FOOD WEB EXPERIMENTS -- 7.2 | PERTURBATIONS AND INDIRECT EFFECTS IN COMPLEX FOOD WEBS -- 7.3 | DEALING WITH MODEL UNCERTAINTY IN TROPHODYNAMIC MODELS: A PATAGONIAN EXAMPLE -- 7.4 | DESCRIBING A SPECIES-RICH RIVER FOOD WEB USING STABLE ISOTOPES, STOMACH CONTENTS, AND FUNCTIONAL EXPERIMENTS -- 7.5 | COMMUNICATING ECOLOGY THROUGH FOOD WEBS: VISUALIZING AND QUANTIFYING THE EFFECTS OF STOCKING ALPINE LAKES WITH TROUT -- 8.0 | PREFACE: THEMATIC REVIEWS -- 8.1 | HOW DO COMPLEX FOOD WEBS PERSIST IN NATURE? -- 8.2 | POPULATION DYNAMICS AND FOOD WEB STRUCTURE - PREDICTING MEASURABLE FOOD WEB PROPERTIES WITH MINIMAL DETAIL AND RESOLUTION. , 8.3 | CENTRAL ISSUES FOR AQUATIC FOOD WEBS: FROM CHEMICAL CUES TO WHOLE SYSTEM RESPONSES -- 8.4 | SPATIAL ASPECTS OF FOOD WEBS -- back matter -- References -- Keywords -- index -- Color Plates.
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  • 2
    Online Resource
    Online Resource
    San Diego :Elsevier,
    Keywords: Climatic changes -- Mathematical models. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (494 pages)
    Edition: 1st ed.
    ISBN: 9780128005835
    DDC: 551.60151
    Language: English
    Note: Front Cover -- Mathematical and Physical Fundamentals of Climate Change -- Copyright -- Contents -- Preface: Interdisciplinary Approaches to Climate Change Research -- Chapter 1: Fourier Analysis -- 1.1 Fourier Series and Fourier Transform -- 1.2 Bessel's Inequality and Parseval's Identity -- 1.3 Gibbs Phenomenon -- 1.4 Poisson Summation Formulas and Shannon Sampling Theorem -- 1.5 Discrete Fourier Transform -- 1.6 Fast Fourier Transform -- 1.7 Heisenberg Uncertainty Principle -- 1.8 Case Study: Arctic Oscillation Indices -- Problems -- Bibliography -- Chapter 2: Time-Frequency Analysis -- 2.1 Windowed Fourier Transform -- 2.2 Wavelet Transform -- 2.3 Multiresolution Analyses and Wavelet Bases -- 2.3.1 Multiresolution Analyses -- 2.3.2 Discrete Wavelet Transform -- 2.3.3 Biorthogonal Wavelets, Bivariate Wavelets,and Wavelet Packet -- 2.4 Hilbert Transform, Analytical Signal, and Instantaneous Frequency -- 2.5 Wigner-Ville Distribution and Cohen's Class -- 2.6 Empirical Mode Decompositions -- Problems -- Bibliography -- Chapter 3: Filter Design -- 3.1 Continuous Linear Time-Invariant Systems -- 3.2 Analog Filters -- 3.3 Discrete Linear Time-Invariant Systems -- 3.3.1 Discrete Signals -- 3.3.2 Discrete Convolution -- 3.3.3 Discrete System -- 3.3.4 Ideal Digital Filters -- 3.3.5 Z-Transforms -- 3.3.6 Linear Difference Equations -- 3.4 Linear-Phase Filters -- 3.4.1 Four Types of Linear-Phase Filters -- 3.4.2 Structure of Linear-Phase Filters -- 3.5 Designs of FIR Filters -- 3.5.1 Fourier Expansions -- 3.5.2 Window Design Method -- 3.5.3 Sampling in the Frequency Domain -- 3.6 IIR Filters -- 3.6.1 Impulse Invariance Method -- 3.6.2 Matched Z-Transform Method -- 3.6.3 Bilinear Transform Method -- 3.7 Conjugate Mirror Filters -- Problems -- Bibliography -- Chapter 4: Remote Sensing -- 4.1 Solar and Thermal Radiation. , 4.2 Spectral Regions and Optical Sensors -- 4.3 Spatial Filtering -- 4.4 Spatial Blurring -- 4.5 Distortion Correction -- 4.6 Image Fusion -- 4.7 Supervised and Unsupervised Classification -- 4.8 Remote Sensing of Atmospheric Carbon Dioxide -- 4.9 Moderate Resolution Imaging Spectroradiometer Data Products and Climate Change -- Problems -- Bibliography -- Chapter 5: Basic Probability and Statistics -- 5.1 Probability Space, Random Variables, and Their Distributions -- 5.1.1 Discrete Random Variables -- 5.1.2 Continuous Random Variables -- 5.1.3 Properties of Expectations and Variances -- 5.1.4 Distributions of Functions of Random Variables -- 5.1.5 Characteristic Functions -- 5.2 Jointly Distributed Random Variables -- 5.3 Central Limit Theorem and Law of Large Numbers -- 5.4 Minimum Mean Square Error -- 5.5 2-Distribution, t-Distribution, and F-Distribution -- 5.6 Parameter Estimation -- 5.7 Confidence Interval -- 5.8 Tests of Statistical Hypotheses -- 5.9 Analysis of Variance -- 5.10 Linear Regression -- 5.11 Mann-Kendall Trend Test -- Problems -- Bibliography -- Chapter 6: Empirical Orthogonal Functions -- 6.1 Random Vector Fields -- 6.2 Classical EOFs -- 6.3 Estimation of EOFs -- 6.4 Rotation of EOFs -- 6.5 Complex EOFs and Hilbert EOFs -- 6.6 Singular Value Decomposition -- 6.7 Canonical Correlation Analysis -- 6.8 Singular Spectrum Analysis -- 6.9 Principal Oscillation Patterns -- 6.9.1 Normal Modes -- 6.9.2 Estimates of Principal Oscillation Patterns -- Problems -- Bibliography -- Chapter 7: Random Processes and Power Spectra -- 7.1 Stationary and Non-stationary Random Processes -- 7.2 Markov Process and Brownian Motion -- 7.3 Calculus of Random Processes -- 7.4 Spectral Analysis -- 7.4.1 Linear Time-Invariant System for WSS Processes -- 7.4.2 Power Spectral Density -- 7.4.3 Shannon Sampling Theorem for Random Processes -- 7.5 Wiener Filtering. , 7.6 Spectrum Estimation -- 7.7 Significance Tests of Climatic Time Series -- 7.7.1 Fourier Power Spectra -- 7.7.2 Wavelet Power Spectra -- Problems -- Bibliography -- Chapter 8: Autoregressive Moving Average Models -- 8.1 ARMA Processes -- 8.1.1 AR(p) Processes -- 8.1.2 MA(q) Processes -- 8.1.3 Shift Operator -- 8.1.4 ARMA(p,q) Processes -- 8.2 Yule-Walker Equation andSpectral Density -- 8.3 Prediction Algorithms -- 8.3.1 Innovation Algorithm -- 8.3.2 Durbin-Lovinson Algorithm -- 8.3.3 Kolmogorov's Formula -- 8.4 Asymptotic Theory -- 8.4.1 Gramer-Wold Device -- 8.4.2 Asymptotic Normality -- 8.5 Estimates of Means and CovarianceFunctions -- 8.6 Estimation for ARMA Models -- 8.6.1 General Linear Model -- 8.6.2 Estimation for AR(p) Processes -- 8.6.3 Estimation for ARMA(p,q) Processes -- 8.7 ARIMA Models -- 8.8 Multivariate ARMA Processes -- 8.9 Application in Climatic and Hydrological Research -- Problems -- Bibliography -- Chapter 9: Data Assimilation -- 9.1 Concept of Data Assimilation -- 9.2 Cressman Method -- 9.3 Optimal Interpolation Analysis -- 9.4 Cost Function and Three-Dimensional Variational Analysis -- 9.5 Dual of the Optimal Interpolation -- 9.6 Four-Dimensional Variational Analysis -- 9.7 Kalman Filter -- Problems -- Bibliography -- Chapter 10: Fluid Dynamics -- 10.1 Gradient, Divergence, and Curl -- 10.2 Circulation and Flux -- 10.3 Green's Theorem, Divergence Theorem, and Stokes's Theorem -- 10.4 Equations of Motion -- 10.4.1 Continuity Equation -- 10.4.2 Euler's Equation -- 10.4.3 Bernoulli's Equation -- 10.5 Energy Flux and Momentum Flux -- 10.6 Kelvin Law -- 10.7 Potential Function and Potential Flow -- 10.8 Incompressible Fluids -- Problems -- Bibliography -- Chapter 11: Atmospheric Dynamics -- 11.1 Two Simple Atmospheric Models -- 11.1.1 The Single-Layer Model -- 11.1.2 The Two-Layer Model -- 11.2 Atmospheric Composition. , 11.3 Hydrostatic Balance Equation -- 11.4 Potential Temperature -- 11.5 Lapse Rate -- 11.5.1 Adiabatic Lapse Rate -- 11.5.2 Buoyancy Frequency -- 11.6 Clausius-Clapeyron Equation -- 11.6.1 Saturation Mass Mixing Radio -- 11.6.2 Saturation Adiabatic Lapse Rate -- 11.6.3 Equivalent Potential Temperature -- 11.7 Material Derivatives -- 11.8 Vorticity and Potential Vorticity -- 11.9 Navier-Stokes Equation -- 11.9.1 Navier-Stokes Equation in an Inertial Frame -- 11.9.2 Navier-Stokes Equation in a Rotating Frame -- 11.9.3 Component Form of the Navier-Stokes Equation -- 11.10 Geostrophic Balance Equations -- 11.11 Boussinesq Approximation and Energy Equation -- 11.12 Quasi-Geostrophic Potential Vorticity -- 11.13 Gravity Waves -- 11.13.1 Internal Gravity Waves -- 11.13.2 Inertia Gravity Waves -- 11.14 Rossby Waves -- 11.15 Atmospheric Boundary Layer -- Problems -- Bibliography -- Chapter 12: Oceanic Dynamics -- 12.1 Salinity and Mass -- 12.2 Inertial Motion -- 12.3 Oceanic Ekman Layer -- 12.3.1 Ekman Currents -- 12.3.2 Ekman Mass Transport -- 12.3.3 Ekman Pumping -- 12.4 Geostrophic Currents -- 12.4.1 Surface Geostrophic Currents -- 12.4.2 Geostrophic Currents from Hydrography -- 12.5 Sverdrup's Theorem -- 12.6 Munk's Theorem -- 12.7 Taylor-Proudman Theorem -- 12.8 Ocean-Wave Spectrum -- 12.8.1 Spectrum -- 12.8.2 Digital Spectrum -- 12.8.3 Pierson-Moskowitz Spectrum -- 12.9 Oceanic Tidal Forces -- Problems -- Bibliography -- Chapter 13: Glaciers and Sea Level Rise -- 13.1 Stress and Strain -- 13.2 Glen's Law and Generalized Glen's Law -- 13.3 Density of Glacier Ice -- 13.4 Glacier Mass Balance -- 13.5 Glacier Momentum Balance -- 13.6 Glacier Energy Balance -- 13.7 Shallow-Ice and Shallow-Shelf Approximations -- 13.8 Dynamic Ice Sheet Models -- 13.9 Sea Level Rise -- 13.10 Semiempirical Sea Level Models -- Problems -- Bibliography. , Chapter 14: Climate and Earth System Models -- 14.1 Energy Balance Models -- 14.1.1 Zero-Dimensional EBM -- 14.1.2 One-Dimensional EBM -- 14.2 Radiative Convective Models -- 14.3 Statistical Dynamical Models -- 14.4 Earth System Models -- 14.4.1 Atmospheric Models -- 14.4.2 Oceanic Models -- 14.4.3 Land Surface Models -- 14.4.4 Sea Ice Models -- 14.5 Coupled Model Intercomparison Project -- 14.6 Geoengineering Model Intercomparison Project -- Problems -- Bibliography -- Index.
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  • 3
    Online Resource
    Online Resource
    Oxford :Oxford University Press, Incorporated,
    Keywords: Food chains (Ecology). ; Ecology. ; Electronic books.
    Description / Table of Contents: Food webs describe biological communities in terms of feeding interactions. This book integrates the latest work on community dynamics, ecosystems energetics, and stability to dispel categorisation of the field into separate subdiciplines of population, community, and ecosystem ecology.
    Type of Medium: Online Resource
    Pages: 1 online resource (344 pages)
    Edition: 1st ed.
    ISBN: 9780191646416
    Series Statement: Oxford Series in Ecology and Evolution Series
    DDC: 577.16
    Language: English
    Note: Cover -- Contents -- Chapter 1 Approaches to studying food webs -- 1.1 Introduction -- 1.2 Traditions in ecology -- 1.2.1 The community perspective -- 1.2.2 The ecosystem perspective -- 1.3 Food webs and traditions in ecology -- 1.3.1 Theoretically based food webs -- 1.3.2 Empirically based food webs: architecture -- 1.3.3 Empirically based food webs: information -- 1.3.4 How useful are these descriptions? -- 1.4 Bridging perspectives through energetics -- 1.4.1 Core concepts and elements -- 1.4.2 Comments on our approach to studying food webs -- 1.5 An overview of the parts and chapters -- 1.6 Summary -- Part I: Modeling simple andmultispecies communities -- Chapter 2 Models of simple and complex systems -- 2.1 Introduction -- 2.2 Model structure and assumptions -- 2.3 Stability -- 2.4 Simple food chains -- 2.5 The dynamics of primary-producer-based and detritus-based models -- 2.6 Summary and conclusions -- Chapter 3 Connectedness food webs -- 3.1 Introduction -- 3.2 Soil food webs -- 3.3 The CPER soil food web -- 3.4 Summary and conclusions -- Chapter 4 Energy flux food webs -- 4.1 Introduction -- 4.2 Biomass and physiological parameters -- 4.3 Feeding rates and mineralization rates -- 4.4 Energy flux descriptions -- 4.5 Summary and conclusions -- Chapter 5 Functional webs -- 5.1 Introduction -- 5.2 Interaction strengths -- 5.3 A functional food web for the CPER -- 5.4 Summary and conclusions -- Part II: The dynamics and stability of simple and complex communities -- Chapter 6 Energetic organization and food web stability -- 6.1 Introduction -- 6.2 Energetic organization and stability -- 6.3 Distribution of interaction strengths: trophic-level-dependent interaction strengths -- 6.4 Summary and conclusions -- Chapter 7 Enrichment, trophic structure, and stability -- 7.1 Introduction -- 7.2 Simple primary-producer-based and detritus-based models. , 7.3 Trophic structure and dynamics along a productivity gradient -- 7.4 More complex models -- 7.5 Connections to real-world productivity -- 7.6 Summary and conclusions -- Chapter 8 Modeling compartments -- 8.1 Introduction -- 8.2 Complexity, diversity, compartments, and stability -- 8.3 Defining compartments -- 8.4 Approaches to studying compartments -- 8.5 The energy channel -- 8.6 Energy channels-structure and stability -- 8.7 Summary and conclusions -- Chapter 9 Productivity, dynamic stability, and species richness -- 9.1 Introduction -- 9.2 Trophic structure, dynamics, and productivity -- 9.3 Feasibility revisited -- 9.4 Feasibility and the hump-shaped curve -- 9.5 Trophic structure and the diversity of production -- 9.6 A review of hypotheses -- 9.7 Summary and conclusions -- Part III: Dynamic food web architectures -- Chapter 10 Species-based versus biomass-based food web descriptions -- 10.1 Introduction -- 10.2 Dynamic food webs-playing Jenga -- 10.3 Two case studies -- 10.4 Stability, disturbance, and transition -- 10.5 Summary and conclusions -- Chapter 11 Dynamic architectures and stability of complex systems along productivity gradients -- 11.1 Introduction -- 11.2 Food web structure in a cave ecosystem -- 11.3 Food web structure and stability along the primary succession gradient at the Wadden island of Schiermonnikoog, The Netherlands -- 11.4 Food web structure in a changing Arctic -- 11.5 General framework -- 11.6 Summary and conclusions -- Chapter 12 Food web dynamics beyond asymptotic behavior -- 12.1 Introduction -- 12.2 Variability, equilibrium states, and asymptotic stability -- 12.3 Transient dynamics -- 12.4 Spatial systems -- 12.5 Asymptotically ambiguous states -- 12.6 Reconciling asymptotic stability, spatial structure, and transient dynamics -- 12.7 Summary and conclusions -- References -- Index -- A -- B -- C -- D -- E. , F -- H -- I -- J -- K -- L -- M -- O -- P -- R -- S -- T -- V -- W.
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  • 4
    Keywords: Food chains (Ecology)
    Type of Medium: Book
    Pages: xvi, 416 Seiten , Diagramme
    ISBN: 9781107182110
    DDC: 577/.16
    RVK:
    Language: English
    Note: Includes bibliographical references and index
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  • 5
    Keywords: Klimaänderung ; Mathematisches Modell
    Type of Medium: Book
    Pages: xii, 481 Seiten
    ISBN: 9780128000663
    RVK:
    RVK:
    Language: English
    Note: Literaturangaben
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 43 (1951), S. 2251-2255 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 49 (1957), S. 411-414 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 22 (2003), S. 0 
    ISSN: 1751-8369
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Geosciences
    Notes: To improve our understanding of Svalbard-type polythermal glacier drainage, hydraulic geometry models of the subglacial hydrology of two contrasting glaciers in Svalbard have been constructed. The models are tested against a uniquely long and rich set of field observations spanning 45 years. Digital elevation models (DEMs) were constructed from bedrock data measured with ground penetrating radar and surface data of two medium-sized polythermal glaciers, Hansbreen and Werenskioldbreen, in south-west Spitsbergen. Hansbreen has a low angle bed with over-deepenings and a calving front, while Werenskioldbreen has steeper bed and terminates on land. Together they are representative of many Svalbard glaciers. The DEMs were used to derive maps of hydraulic potential and subglacial drainage networks. Validation of the models was done using field observations including location mapping and speleological exploration of active moulins, positions of main river outflows, dyetracing and water chemistry studies, and observations of water pressure inside moulins. Results suggest that the water pressure is generally close to ice overburden pressure but varies greatly depending on local conditions such as bed location, the thickness of cold ice layer, the thickness of the glacier and seasonal changes in meltwater input.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 442 (2006), S. 265-269 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Untangling the influence of human activities on food-web stability and persistence is complex given the large numbers of species and overwhelming number of interactions within ecosystems. Although biodiversity has been associated with stability, the actual structures and processes that confer ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical crystallography 13 (1983), S. 279-292 
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal and molecular structure of white (MNA-1) and yellow (MNA-3) forms of 4-methyl-2-nitroacetanilide have been determined by X-ray diffraction techniques. The crystals of MNA-1 are monoclinic,a=10.421(2),b=9.980(2),c=9.568(2) Å,β=99.51(2)°, space groupP21/c,Z=4. Crystals of MNA-3 are triclinic,a=17.956(2),b=12.908(2),c=4.039(1) Å,α=93.13(2)°,β=83.71(2)°, γ=90.77(2)°, space groupP¯1,Z=4. Both structures were solved by direct methods using theShelx-76 system of programs, and refined using full-matrix least squares. The number of unique reflections used in refinement and the finalR values are: MNA-1, 1545, 0.067; MNA-3, 3127, 0.065. The two distinct molecules in MNA-3 have intramolecular hydrogen bonds and different molecular conformations, although both are fairly planar, and each type is closely packed in columns of parallel molecules along thec direction. In MNA-1 the C=O⋯H-N geometry is indicative of intermolecular hydrogen bonding and the molecules adopt a conformation in which the nitro and amide groups lie in planes at approximately 45° to the benzene ring.
    Type of Medium: Electronic Resource
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