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  • 1
    Keywords: Soil pollution-Congresses. ; Electronic books.
    Description / Table of Contents: Selected proceedings of the First European Conference on Integrated Research for Soil and Sediment Protection and Remediation.
    Type of Medium: Online Resource
    Pages: 1 online resource (739 pages)
    Edition: 1st ed.
    ISBN: 9789401120081
    Series Statement: Soil and Environment Series ; v.1
    Language: English
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  • 2
    Online Resource
    Online Resource
    Hauppauge :Nova Science Publishers, Incorporated,
    Keywords: Gravitational waves. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (193 pages)
    Edition: 1st ed.
    ISBN: 9781614703990
    Series Statement: Physics Research and Technology
    DDC: 539.7/54
    Language: English
    Note: Intro -- THE BIG CHALLENGE OF GRAVITATIONAL WAVES -- THE BIG CHALLENGE OF GRAVITATIONAL WAVES -- Contents -- Preface -- INTRODUCTION -- References -- GRAVITATIONAL WAVES ASTRONOMY: THE ULTIMATE TEST FOR EINSTEIN'S GENERAL RELATIVITY -- Abstract -- Acknowledgements -- References -- MICROSCOPIC QUANTUM OBJECT TO REVEAL GRAVITATIONAL WAVES -- Abstract -- 1.Introduction -- 2.TwoQuantumStateSuperposition -- 3.TwoClassesofInterferometers -- 4.PhaseShift -- 5.LaserFrequencyFluctuations -- 6.Conclusions -- References -- ANALYTICAL ESTIMATE OF ATMOSPHERIC NEWTONIAN NOISE GENERATED BY ACOUSTIC AND TURBULENT PHENOMENA IN LASER-INTERFEROMETRIC GRAVITATIONAL WAVES DETECTORS -- Abstract -- 1.Introduction -- 2.GravityGradientNoiseduetoAtmosphericFluctuations:Creighton'sWork -- 3.CalculationofNewtonianNoise -- 4.AcousticPhenomena -- 4.1.PropagationofAcousticWavesinaSemispace -- 5.TurbulentPhenomena -- 5.1.IncompressibleTurbulence:LighthillProcess -- 6.Conclusions -- Acknowledgments -- References -- PRIMORDIAL GRAVITATIONAL WAVES AND LEPTOGENESIS -- Abstract -- 1.Introduction -- 2.SomeTopicsonBaryogenesis -- 2.1.TheSakharovConditions -- 2.2.BaryogenesisviaanEffectiveCPTViolation -- 2.3.LeptogenesisScenario -- 3.LeptogenesisInducedbySpin-GravityCouplingofNeutrinoswiththePrimordialGravitationalWaves -- 3.1.TheDiracEequationinCurvedSpacetime -- 3.2.TheLeptogenesisMechanismfromSpin-gravityCouplingFol-lowingInflation -- 4.Conclusion -- Acknowledgments -- Appendix -- A.TheDiracEquationinCurvedSpacetimes -- B.ThePowerSpectrumoftheGravitationalWaves -- References -- GRAVITATIONAL WAVE BURSTS FROM GALACTIC RUN A WAY PULSARS FLUNG OUT OF SUPERNOVAE AND TIDALLY DISRUPTING COMPACT BINARIES -- Abstract -- 1.Introduction -- 2.GalacticRAPsandSampleSelectionfromATNFCatalog -- 2.1.SampleSelectionfromATNFDatabase. , 3.PresentGalacticPulsarDynamicsHintsatDetectabilityofGWSignalsfromtheShortRiseFlingofRAPsinSupernovae -- 3.1.EstimatesofPresenthc,fGWGWCharacteristicsHintatProspectiveDetectionduringRAPsShortRiseFlinginSupernovae -- 3.1.1.FrequencyEstimate -- 3.1.2.AmplitudeEstimate -- 4.GravitationalWavesfromPulsarAcceleration -- 5.MoreRealisticAnalysisofGWEmissionfromRAPs -- 5.1.Casea:CenteredKickV=Vkickand =1 -- 5.1.1.Flingwitha=104kms−2,Vkick=104kms−1 -- 5.1.2.Flingwitha=106kms−2,Vkick=104kms−1 -- 5.2.Caseb:Off-centeredKick -- 5.2.1.Efficiency =0.05 -- 5.2.2.Efficiency =0.10 -- 5.2.3.Efficiency =0.40 -- 6.DiscussionandConclusions -- 6.1.ComputedRotationPeriodsvs.PeriodsofATNFSampleofRAPswithV=400−500kms−1 -- Acknowledgments -- References -- A Survey on High Frequency Gravitational Wave Research: Towards new Horizons in Science and Technology -- Abstract -- Overview of Gravitational Waves -- Historical Remark -- Nature of Gravitational Waves -- Sources for Gravitational Waves -- A. Astrophysical Sources for Gravitational Waves -- B. Testing Fundamental Physics with Gravitational Waves -- Evidence for Gravitational Waves -- Detection Mechanisms for Low to Medium Frequency Gravitational Waves -- High Frequency Gravitational Waves: A New Domain -- Rationales behind High Frequency Gravitational Waves Research -- Generation of High Frequency Gravitational Waves Research -- A. Sources in Nature for High Frequency Gravitational Waves -- B. Laboratory Sources for High Frequency Gravitational Waves -- Generation by X-Ray Lasers -- Generation by Piezoelectric or Film Bulk Acoustic Resonators (FBARs) -- Generation by a Toroid with an Electromagnetic Field -- Generation by Nuclear Reactions -- Generation by Quantum, Phenomena: The High Temperature Superconductor Gaser (HTSC Gaser) -- Detection Mechanisms for High Frequency Gravitational Waves. , A. Circular Waveguide Detector -- B. Coupled Electromagnetic Cavities -- C. Static Magnetic Field with an Electromagnetic sense beam -- Generator-Detector (Emitter-Receiver) Sets for High Frequency Gravitational Waves -- Technology Upgrades -- Potential Applications for HFGW -- Conclusion -- Acknowledgments -- References -- INDEX.
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  • 3
    Online Resource
    Online Resource
    Geneva :World Health Organization,
    Keywords: Cobalt. ; Inorganic compounds. ; Electronic books.
    Description / Table of Contents: Cobalt is a naturally occurring element with a number of radioactive isotopes. It is a silvery grey solid at room temperatures. Sources of exposure are both natural and anthropogenic with the largest source of exposure to the general population is through the food supply. This Concise International Assessment Document (CICAD) evaluates the scientific literature on the health and environmental effects of cobalt and cobalt compounds based on selected national and regional evaluations. This CICAD focuses on the stable isotopes of cobalt rather than radioactive ones.
    Type of Medium: Online Resource
    Pages: 1 online resource (93 pages)
    Edition: 1st ed.
    ISBN: 9789240681880
    DDC: 615.925623
    Language: English
    Note: Intro -- TABLE OF CONTENTS -- FOREWORD -- CICAD PREPARATION FLOW CHART -- 1. EXECUTIVE SUMMARY -- 2. IDENTITY AND PHYSICAL/CHEMICAL PROPERTIES -- 3. ANALYTICAL METHODS -- 4. SOURCES OF HUMAN AND ENVIRONMENTAL EXPOSURE -- 5. ENVIRONMENTAL TRANSPORT, DISTRIBUTION, AND TRANSFORMATION -- 6. ENVIRONMENTAL LEVELS AND HUMAN EXPOSURE -- 6.1 Environmental levels -- 6.2 Human exposure -- 7. COMPARATIVE KINETICS AND METABOLISM IN LABORATORY ANIMALS AND HUMANS -- 7.1 Absorption -- 7.2 Distribution -- 7.3 Elimination -- 7.4 Pharmacokinetic models -- 7.5 Biological monitoring -- 8. EFFECTS ON LABORATORY MAMMALS AND IN VITRO TEST SYSTEMS -- 8.1 Single exposure -- 8.2 Short-term exposure -- 8.3 Medium-term exposure -- 8.4 Long-term exposure and carcinogenicity -- 8.5 Genotoxicity and related end-points -- 8.6 Reproductive toxicity -- 8.7 Other toxicity -- 8.8 Mode of action -- 9. EFFECTS ON HUMANS -- 10. EFFECTS ON OTHER ORGANISMS IN THE LABORATORY AND FIELD -- 10.1 Essentiality -- 10.2 Aquatic environment -- 10.3 Terrestrial environment -- 11. EFFECTS EVALUATION -- 11.1 Evaluation of health effects -- 11.2 Evaluation of environmental effects -- 12. PREVIOUS EVALUATIONS BY IOMC BODIES -- REFERENCES -- APPENDIX 1 - ACRONYMS AND ABBREVIATIONS -- APPENDIX 2 - SOURCE DOCUMENTS -- APPENDIX 3 - CICAD PEER REVIEW -- APPENDIX 4 - CICAD FINAL REVIEW BOARD -- APPENDIX 5 - OUTLINE OF THE SPECIES SENSITIVITY DISTRIBUTION METHOD -- INTERNATIONAL CHEMICAL SAFETY CARDS -- RÉSUMÉ D'ORIENTATION -- RESUMEN DE ORIENTACIÓN -- THE CONCISE INTERNATIONAL CHEMICAL ASSESSMENT DOCUMENT SERIES -- To order further copies.
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  • 4
    Online Resource
    Online Resource
    Cambridge :Cambridge University Press,
    Keywords: Physics - Simulation methods. ; Electronic books.
    Description / Table of Contents: From quantum mechanics to fluid dynamics, this 2007 book systematically treats the broad scope of computer modeling and simulations, describing fundamental theory, and possibilities and limitations of the models. Practical guidance for applications and sample programs in Python are provided. For advanced undergraduates, graduates, and practitioners. Resources available at www.cambridge.org/9780521835275.
    Type of Medium: Online Resource
    Pages: 1 online resource (626 pages)
    Edition: 1st ed.
    ISBN: 9780511294112
    DDC: 530.011
    Language: English
    Note: Cover -- Half-title -- Title -- Copyright -- Contents -- Preface -- Symbols, units and constants -- Symbols -- Units -- SI Units -- Atomic units -- Molecular units -- Physical constants -- Part I A Modeling Hierarchy for Simulations -- 1 Introduction -- 1.1 What is this book about? -- 1.1.1 Simulation of real systems -- 1.1.2 System limitation -- 1.1.3 Sophistication versus brute force -- 1.2 A modeling hierarchy -- 1.3 Trajectories and distributions -- 1.4 Further reading -- 2 Quantum mechanics: principles and relativistic effects -- 2.1 The wave character of particles -- 2.2 Non-relativistic single free particle -- 2.3 Relativistic energy relations for a free particle -- 2.4 Electrodynamic interactions -- 2.4.1 Homogeneous external magnetic field -- 2.4.2 Electromagnetic plane wave -- 2.5 Fermions, bosons and the parity rule -- Exercises -- 3 From quantum to classical mechanics: when and how -- 3.1 Introduction -- 3.2 From quantum to classical dynamics -- 3.3 Path integral quantum mechanics -- 3.3.1 Feynman's postulate of quantum dynamics -- 3.3.2 Equivalence with the Schrödinger equation -- 3.3.3 The classical limit -- 3.3.4 Evaluation of the path integral -- 3.3.5 Evolution in imaginary time -- 3.3.6 Classical and nearly classical approximations -- 3.3.7 The free particle -- 3.3.8 Non-interacting particles in a harmonic potential -- 3.3.9 Path integral Monte Carlo and molecular dynamics simulation -- 3.4 Quantum hydrodynamics -- 3.4.1 The hydrodynamics approach -- 3.4.2 The classical limit -- 3.5 Quantum corrections to classical behavior -- 3.5.1 Feynman-Hibbs potential -- 3.5.2 The Wigner correction to the free energy -- 3.5.3 Equivalence between Feynman-Hibbs and Wigner corrections -- 3.5.4 Corrections for high-frequency oscillators -- 3.5.5 The fermion-boson exchange correction -- Exercises. , 4 Quantum chemistry: solving the time-independent Schrödinger equation -- 4.1 Introduction -- 4.2 Stationarysolutions of the TDSE -- 4.3 The few-particle problem -- 4.3.1 Shooting methods -- 4.3.2 Expansion on a basis set -- 4.3.3 Variational Monte Carlo methods -- 4.3.4 Relaxation methods -- 4.3.5 Diffusional quantum Monte Carlo methods -- 4.3.6 A practical example -- 4.3.7 Green's function Monte Carlo methods -- 4.3.8 Some applications -- 4.4 The Born-Oppenheimer approximation -- 4.5 The many-electron problem of quantum chemistry -- 4.6 Hartree-Fock methods -- 4.7 Density functional theory -- 4.8 Excited-state quantum mechanics -- 4.9 Approximate quantum methods -- 4.10 Nuclear quantum states -- 5 Dynamics of mixed quantum/classical systems -- 5.1 Introduction -- 5.2 Quantum dynamics in a non-stationary potential -- 5.2.1 Integration on a spatial grid -- 5.2.2 Time-independent basis set -- 5.2.3 Time-dependent basis set -- 5.2.4 The two-level system -- 5.2.5 The multi-level system -- 5.3 Embedding in a classical environment -- 5.3.1 Mean- eld back reaction -- 5.3.2 Forces in the adiabatic limit -- 5.3.3 Surface hopping dynamics -- 5.3.4 Other methods -- Exercises -- 6 Molecular dynamics -- 6.1 Introduction -- 6.2 Boundary conditions of the system -- 6.2.1 Periodic boundary conditions -- 6.2.2 Continuum boundary conditions -- 6.2.3 Restrained-shell boundary conditions -- 6.3 Force field descriptions -- 6.3.1 Ab-Initio molecular dynamics -- 6.3.2 Simple molecular force fields -- 6.3.3 More sophisticated force fields -- 6.3.4 Long-range dispersion interactions -- 6.3.5 Long-range Coulomb interactions -- 6.3.6 Polarizable force fields -- 6.3.7 Choices for polarizability -- 6.3.8 Energies and forces for polarizable models -- 6.3.9 Towards the ideal force field -- 6.3.10 QM/MM approaches -- 6.4 Solving the equations of motion -- 6.4.1 Constraints. , 6.5 Controlling the system -- 6.5.1 Stochastic methods -- 6.5.2 Strong-coupling methods -- 6.5.3 Weak-coupling methods -- 6.5.4 Extended system dynamics -- 6.5.5 Comparison of thermostats -- 6.6 Replica exchange method -- 6.7 Applications of molecular dynamics -- Exercises -- 7 Free energy, entropy and potential of mean force -- 7.1 Introduction -- 7.2 Free energy determination by spatial integration -- 7.3 Thermodynamic potentials and particle insertion -- 7.4 Free energy by perturbation and integration -- 7.5 Free energy and potentials of mean force -- 7.6 Reconstruction of free energy from PMF -- 7.6.1 Harmonic wells -- 7.7 Methods to derive the potential of mean force -- 7.8 Free energy from non-equilibrium processes -- 7.8.1 Proof of Jarzynski's equation -- 7.8.2 Evolution in space only -- 7.8.3 Requirements for validity of Jarzynski's equation -- 7.8.4 Statistical considerations -- 8 Stochastic dynamics: reducing degrees of freedom -- 8.1 Distinguishing relevant degrees of freedom -- 8.2 The generalized Langevin equation -- 8.3 The potential of mean force -- 8.4 Superatom approach -- 8.5 The fluctuation-dissipation theorem -- 8.6 Langevin dynamics -- 8.6.1 Langevin dynamics in generalized coordinates -- 8.6.2 Markovian Langevin dynamics -- 8.7 Brownian dynamics -- 8.8 Probability distributions and Fokker-Planck equations -- 8.8.1 General Fokker-Planck equations -- 8.8.2 Application to generalized Langevin dynamics -- 8.8.3 Application to Brownian dynamics -- 8.9 Smart Monte Carlo methods -- 8.10 How to obtain the friction tensor -- 8.10.1 Solute molecules in a solvent -- 8.10.2 Friction from simulation -- Exercises -- 9 Coarse graining from particles to .uid dynamics -- 9.1 Introduction -- 9.2 The macroscopic equations of fluid dynamics -- 9.2.1 Conservation of mass -- 9.2.2 The equation of motion -- 9.2.3 Conservation of linear momentum. , 9.2.4 The stress tensor and the Navier-Stokes equation -- 9.2.5 The equation of state -- 9.2.6 Heat conduction and the conservation of energy -- 9.3 Coarse graining in space -- 9.3.1 Definitions -- 9.3.2 Stress tensor and pressure -- 9.3.3 Conservation of mass -- 9.3.4 Conservation of momentum -- 9.3.5 The equation of motion -- 9.4 Conclusion -- Exercises -- 10 Mesoscopic continuum dynamics -- 10.1 Introduction -- 10.2 Connection to irreversible thermodynamics -- 10.3 The mean field approach to the chemical potential -- 11 Dissipative particle dynamics -- 11.1 Representing continuum equations by particles -- 11.2 Prescribing fluid parameters -- 11.3 Numerical solutions -- 11.4 Applications -- Part II Physical and Theoretical Concepts -- 12 Fourier transforms -- 12.1 Definitions and properties -- 12.2 Convolution and autocorrelation -- 12.3 Operators -- 12.4 Uncertainty relations -- 12.5 Examples of functions and transforms -- 12.5.1 Square pulse -- 12.5.2 Triangular pulse -- 12.5.3 Gaussian function -- 12.6 Discrete Fourier transforms -- 12.7 Fast Fourier transforms -- 12.8 Autocorrelation and spectral density from FFT -- 12.9 Multidimensional Fourier transforms -- Exercises -- 13 Electromagnetism -- 13.1 Maxwell's equation for vacuum -- 13.2 Maxwell's equation for polarizable matter -- 13.3 Integrated form of Maxwell's equations -- 13.4 Potentials -- 13.5 Waves -- 13.6 Energies -- 13.7 Quasi-stationary electrostatics -- 13.7.1 The Poisson and Poisson-Boltzmann equations -- 13.7.2 Charge in a medium -- 13.7.3 Dipole in a medium -- 13.7.4 Charge distribution in a medium -- 13.7.5 The generalized Born solvation model -- 13.8 Multipole expansion -- 13.8.1 Expansion of the potential -- 13.8.2 Expansion of the source terms -- 13.9 Potentials and fields in non-periodic systems -- 13.10 Potentials and fields in periodic systems of charges. , 13.10.1 Short-range contribution -- 13.10.2 Long-range contribution -- 13.10.3 Gaussian spread function -- 13.10.4 Cubic spread function -- 13.10.5 Net dipolar energy -- 13.10.6 Particle-mesh methods -- 13.10.7 Potentials and fields in periodic systems of charges and dipoles -- Exercises -- 14 Vectors, operators and vector spaces -- 14.1 Introduction -- 14.2 Definitions -- 14.3 Hilbert spaces of wave functions -- 14.4 Operators in Hilbert space -- 14.5 Transformations of the basis set -- 14.6 Exponential operators and matrices -- 14.6.1 Example of a degenerate case -- 14.7 Equations of motion -- 14.7.1 Equations of motion for the wave function and its representation -- 14.7.2 Equation of motion for observables -- 14.8 The density matrix -- 14.8.1 The ensemble-averaged density matrix -- 14.8.2 The density matrix in coordinate representation -- 15 Lagrangian and Hamiltonian mechanics -- 15.1 Introduction -- 15.2 Lagrangian mechanics -- 15.3 Hamiltonian mechanics -- 15.4 Cyclic coordinates -- 15.5 Coordinate transformations -- 15.6 Translation and rotation -- 15.6.1 Translation -- 15.6.2 Rotation -- 15.7 Rigid body motion -- 15.7.1 Description in terms of angular velocities -- 15.7.2 Unit vectors -- 15.7.3 Euler angles -- 15.7.4 Quaternions -- 15.8 Holonomic constraints -- 15.8.1 Generalized coordinates -- 15.8.2 Coordinate resetting -- 15.8.3 Projection methods -- 16 Review of thermodynamics -- 16.1 Introduction and history -- 16.2 Definitions -- 16.2.1 Partial molar quantities -- 16.3 Thermodynamic equilibrium relations -- 16.3.1 Relations between partial differentials -- 16.4 The second law -- 16.5 Phase behavior -- 16.6 Activities and standard states -- 16.6.1 Virial expansion -- 16.7 Reaction equilibria -- 16.7.1 Proton transfer reactions -- 16.7.2 Electron transfer reactions -- 16.8 Colligative properties -- 16.9 Tabulated thermodynamic quantities. , 16.10 Thermodynamics of irreversible processes.
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  • 5
    Online Resource
    Online Resource
    London :SAGE Publications, Limited,
    Keywords: Research - Methodology. ; Electronic books.
    Description / Table of Contents: This text argues that the methodology of quantitative research is a unified discipline with basic notions, procedures and ways of reasoning which can be applied across the social, behavioural and life sciences. Key designs, models and methods in research are covered by leading contributors in their field.
    Type of Medium: Online Resource
    Pages: 1 online resource (412 pages)
    Edition: 1st ed.
    ISBN: 9781446205280
    DDC: 300.7/2
    Language: English
    Note: Cover -- Table of Contents -- 1 - Introduction -- 2 - Some Remarks on the History of Method -- 3 - Graphical Representation of Methodological Concepts -- 4 - Meta Data: Well-Defined Models of Data Sets -- 5 - Experimental Design -- 6 - Clinical Trials: A Statistician's Perspective -- 7 - Cross-Sectional Research -- 8 - Longitudinal Analysis -- 9 - Measurement Models -- 10 - Graphical Modelling -- 11 - Structural Equation MOdelling -- 12 - Graphs, Causality, and Structural Equation Models -- 13 - Meta-Analysis -- Index.
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  • 6
    Online Resource
    Online Resource
    Nashville : Vanderbilt University Press
    Keywords: Rorty, Richard. ; Rorty, Richard ; Rorty, Richard ; Rorty, Richard. ; Rorty, Richard ; Pragmatism. ; Pragmatism ; Pragmatism ; Pragmatism. ; Electronic books. ; Electronic books. ; Electronic books ; Rorty, Richard 1931-2007 ; Rorty, Richard 1931-2007
    Description / Table of Contents: Richard Rorty is a philosopher who has been taken seriously in fields and disciplines far beyond his own. He challenges established forms of philosophical inquiry, particularly epistemology and metaphysics, jettisoning philosophical claims to unchanging truth and to scientific accuracy. His view that philosophy is pragmatic, interpretive, and historicist has brought him both accolades and criticism. In Rorty and Pragmatism, this highly influential and sometimes controversial philosopher responds to several of his most prominent critics, representing a wide range of backgrounds and concerns. Each of these critical challenges raises significant questions about Rorty's philosophical outlook. Whether or not one agrees with all of his positions, his replies are consequential. They provide insight into Rorty's thought, its development, and his sense of the future of philosophy. They further the discussion of the role of philosophy and of its contributions to society
    Type of Medium: Online Resource
    Pages: xvi, 258 p , 24 cm
    Edition: 1st ed
    ISBN: 0585159513 , 9780585159515
    Series Statement: The Vanderbilt library of American philosophy
    DDC: 191
    Language: English
    Note: Each article includes a response by R. Rorty , Includes bibliographical references (p. [231]-244) and index , Electronic reproduction, Boulder, Colo : NetLibrary, 2000 , Dewey between Hegel and Darwin / Richard Rorty -- Rorty's pragmatism and farewell to the age of faith and enlightenment / Charles Hartshorne -- America and the contestations of modernity / Thelma Z. Lavine -- American pragmatism / Richard J. Bernstein -- What is the legacy of instrumentalism? / James Gouinlock -- Pragmatism as naturalized Hegelianism / Allen Hance -- Vulgar pragmatism / Susan Haack -- Rorty and the antirealism / Frank B. Farrell -- Philosophy and the future / Richard Rorty , Dewey between Hegel and Darwin , Rorty's pragmatism and farewell to the age of faith and enlightenment , America and the contestations of modernity , American pragmatism , What is the legacy of instrumentalism? , Pragmatism as naturalized Hegelianism , Vulgar pragmatism , Rorty and the antirealism , Philosophy and the future
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  • 7
    ISSN: 1573-5125
    Keywords: seston ; epipelon ; sediment ; wind effects ; resuspension ; horizontal transportation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Horizontal variation of seston concentration in the shallow, eutrophic Loosdrecht Lakes (A=9.8 km2; $$\overline z $$ =1.9 m) was studied in relation to windspeed and effective fetch. Simple wave theory was applied in order to predict resuspension using wind data from a nearby meteorological station. Most results were consistent with the theory, but a clear limit for the occurrence of resuspension could not be established. Generally, changes in epipelon—the particles at the sediment-water interface — were not directly related to computed frequency of resuspension at the sampling station. The frequency was estimated for 37 grid points over the entire lake. Resuspension was computed to affect high percentages of the lake area in winter. In summer the frequency was much lower, but in June and July 1984 there were days with nearly 50% of the lake area subject to resuspension. The resulting input of particulate organic carbon into the water column during these days was estimated to equal 12–25 times the daytime phytoplankton carbon fixation. Most of the resuspended matter appeared to be redeposited rapidly. The computed frequency of resuspension for the 37 locations of the lake varied between 7 and 48 days in 1984.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Aquatic ecology 20 (1986), S. 61-75 
    ISSN: 1573-5125
    Keywords: eutrophication ; lake restoration ; blue-green algae ; zooplankton ; seston ; epipelon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Features of the Loodsrecht Lakes, with emphasis on the main lake, are discussed with reference to restoration. Characteristics of the present situation are: (1) very low water transparency-Secchi-disc readings around 0.3 m occur in all seasons; (2) relatively small seasonal changes in sestonic matter; (3) important input of resuspended particles into the seston; (4) predominance of filamentous blue-green algae for most of the year; (5) relative scarcity of crustacean zooplankton, while rotifers are abundant; (6) poor development of littoral communities, and absence of benthic producers. The blue-green algae maintain high population density at very low growth rates: rates of loss are low. The zooplankton grazing rate is low due to inefficient filtering, but predation of larger crustaceans by fish may also be important. Studies on epipelon indicated that loss by deposition may be largely compensated by resuspension. Starting in 1984, the external phosphorus loading was markedly reduced. Results for 1984 and 1985 indicate that complementary measures are needed in order to improve water quality. Action should be directed towards increasing the phytoplankton turnover rates. Accelerated specific growth rate can be expected to accompany lower biomass, more successful competition by other algal groups, and enhancement of grazing pressure. Considering the shallowness of the system, promotion of littoral development and return of submerged vegetation may be important in establishing a new equilibrium of the system.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-5117
    Keywords: phytoplankton ; epipelon ; Oscillatoria limnetica ; detritus ; shallow lakes ; lake restoration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study was made of the mortality and aerobic decomposition of light- and phosphorus-limited cultures of Oscillatoria limnetica, a dominant phytoplankton species in shallow, eutrophic Lake Loosdrecht (The Netherlands). When placed in the dark at 20 °C, most cells died and lysed within twelve days. The labile organic matter was completely decomposed within three weeks. Absorbance spectra indicated that blue green algae may contributed significantly to the refractory dissolved substances in the lake. Refractory particulate matter constituted from 7 to 24% of the biomass of O. limnetica, depending on the growth rate before incubation in the dark. The decomposition rate of this fraction was 0.005 d−1. On a basis of a steady-state model of the dynamics of phytoplankton detritus, the areal organic dry weight concentration of the detritus in the lake is ca. 60 g m−2. This means the quantities of detritus in the seston and epipelon are about equal.
    Type of Medium: Electronic Resource
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