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  • 1
    Electronic Resource
    Electronic Resource
    External gravity oscillations in Lake Onega (1995)
    Springer
    Annales geophysicae 13 (1995), S. 893-906 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Lake Onega is located in the southern part of Karelia, in the north-west of Russia. We report data taken by various limnigraphs and current meters and isolate, by spectral analysis, the most conspicuous barotropic periods of these signals. The analysis that follows is based on the linearized shallow-water equations, that are solved for the free oscillations and thus identify the eigenperiods and corresponding mode structures for this lake. Computational results are presented for a finite difference representation for these surface-seiche equations applied to the entire Lake Onega including its bays. The grid consists of quadratic elements of 1000 m side length corresponding to 9344 active cells. The emerging matrix eigenvalue problem exceeds the storage and compuational capacity of standard PCs or workstations and thus requires use of the approximate Lanczos procedure to isolate the first ten eigenperiods and corresponding mode structures of the barotropic seiches, lying between 12.1 and 2.2 h. Comparison of computational results and inferences from the water level and current-meter records, disclose satisfactory agreement between theory and observation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-995-0893-2
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The isobaric analog pair ^5^7"2"6Fe^5^7"2"7Co
    Amsterdam : Elsevier
    Nuclear Physics, Section A 151 (1970), S. 211-224 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(70)90980-2
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Improved energy resolution of Van de Graaff accelerators
    Amsterdam : Elsevier
    Nuclear Instruments and Methods 59 (1968), S. 325-328 
    Details
    ISSN: 0029-554X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-554X(68)90519-3
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The Q values of the reaction ^9Be(p, d)^8Be and ^8Be -〉 2 ^4He
    Amsterdam : Elsevier
    Physics Letters 20 (1966), S. 40-42 
    Details
    ISSN: 0031-9163
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9163(66)91039-0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Precision determination of the threshold energy of the T(p, n)^3He reaction and the neutron-proton mass difference
    Amsterdam : Elsevier
    Nuclear Physics 53 (1964), S. 457-464 
    Details
    ISSN: 0029-5582
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-5582(64)90625-X
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  • 6
    Electronic Resource
    Electronic Resource
    A precision determination of the mass difference of ^2^7Al and ^2^4Mg from the reactions ^2^4Mg(α, γ)^2^8Si and ^2^7Al(p, γ)^2^8Si
    Amsterdam : Elsevier
    Nuclear Physics 43 (1963), S. 229-235 
    Details
    ISSN: 0029-5582
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0029-5582(63)90343-2
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  • 7
    Electronic Resource
    Electronic Resource
    Hydrodynamics of Lake Lugano (1992)
    Springer
    Aquatic sciences 54 (1992), S. 187-204 
    Details
    ISSN: 1420-9055
    Keywords: Physical limnology ; external/internal seiches ; numerical models ; barotropic/baroclinic circulation ; Lake Lugano (Lago di Lugano)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The hydrodynamic processes in the Lake of Lugano (Lago di Lugano) have been the object of three major measuring campaigns. The first during summer 1979 in the North Basin, the second in the autumn of 1984 in the South Basin and the last in 1989 again in the North Basin. It is expected that analysis of the collected data in conjunction with theoretical concepts will yield conclusive findings on the driving forces and hydrodynamics of the lake. Numerical models have been applied to the lake and the results have been compared to the measurements. Some models calculate the periods and distributions of amplitude, as well as surface velocities and internal seiches. Other models calculate wind-induced water circulation. Evidence is given to the peculiarities of the North Basin and the difficulties related with the depth-width ratio and with its deep chemical stratification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878136
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  • 8
    Electronic Resource
    Electronic Resource
    The dynamic model Seemod applied to the Southern Basin of Lake Lugano (1992)
    Springer
    Aquatic sciences 54 (1992), S. 367-380 
    Details
    ISSN: 1420-9055
    Keywords: limnology ; forecast model ; water quality ; Lake of Lugano (Lago di Lugano)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The dynamic model Seemod developed at the EAWAG (Imboden and Gächter, 1978) and modified by Bührer (Ambühl and Bührer, 1984), was adapted to the South Basin of the Lake of Lugano (Lago di Lugano). The model can predict the evolution of the state of the lake, described by the concentrations of dissolved phosphorus, dissolved oxygen particulate phosphorus and organic particulate carbon, in function of phosphorus load and taking into account physical and biochemical initial- and boundary conditions. The model parameters were chosen through measurements and calibrations by short runs. A 10-year-long simulation was done, starting from the data of 1980, and its results agree quite well with the measurements. Then some 15-year-long simulations were done, which corresponded to different scenarios related to a progressive linking up of sewage systems to water treatment plants. The model predicts that a satisfactory water quality level can only be reached by reducing the total phosphorus input to less than 25 t/a.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878148
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  • 9
    Electronic Resource
    Electronic Resource
    A coupled physical-biochemical lake model for forecasting water quality (1993)
    Springer
    Aquatic sciences 55 (1993), S. 87-102 
    Details
    ISSN: 1420-9055
    Keywords: modelling of water quality ; coupled physical-biochemical model ; chemical stratification ; Lake Lugano
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new one-dimensional numerical model that includes physical and biochemical processes has been developed. The biochemical processes, influenced by the lake dynamics, are required for forecasting water quality. The model is used to investigate the effects of different internal restoration measures, such as artificial mixing, input of oxygen and drainage of deep water. The model is applied to the Northern Basin of Lake Lugano, a Swiss-Italian border lake. The lake is highly eutrophic and chemically stratified throughout the year. The model was calibrated over one year and validated over a period of several years. The results agree well with the measured data. The coupled model reproduces the observed depth dependency of conductivity even during long simulation times. Due to the predominant mixing, decoupled physical models cannot maintain such gradients. The forecasting capabilities of the model are demonstrated for different case studies. The impact of restoration measures on water quality is rather small. Best results are achieved by reducing the external nutrient loading. Caution is recommended for internal measures as these have to be studied in greater detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877438
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  • 10
    Electronic Resource
    Electronic Resource
    Large scale water movements in lakes (1991)
    Springer
    Aquatic sciences 53 (1991), S. 100-135 
    Details
    ISSN: 1420-9055
    Keywords: Physical limnology ; hydrodynamic fundamentals ; exterior/interior seiches ; coupled oscillations ; barotropic/baroclinic circulation ; three dimensional numerical techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract By large scale circulation in lakes one means motions whose characteristic length scales extend over most parts or all of the water masses in a lake or the ocean. We present the governing equations and motivate, by means of a scale analysis, the various simplified versions of model equations that are in use in computational lake dynamics. This scale analysis not only permits rational deduction of the reduced equations, it equally provides a means of estimating their limitations. These are discussed as are the difficulties and the peculiarities inherent in the proposed equation sets. Special features of external and internal wave motions are studied. For barotropic oscillations of a lake system (Lake of Lugano) it is shown that substantial water masses are exchanged between the individual basins at the resonating periods. Baroclinic seiches of a three layer model in which each layer is effective within its own domain show (for the North basin of the Lake of Lugano) that mode structures may differ from layer to layer pointing at important modifications of classical interpretations of higher baroclinic wave dynamics. And in large lakes in the equatorial belt theβ-effect forces modifications of the classical understanding of seiche behavior. Long periodic oscillating features may be attributed to topographic Rossby waves or higher baroclinic internal gravity waves; the observational identification is, however, difficult because lack of spatial resolution of the data makes this identification non-unique. We, finally present results of a full nonlinear numerical baroclinic circulation model and demonstrate that it is able to reproduce the gross features of the immediate response to strong storms during a few days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00877057
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    Paper (German National Licenses)
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