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  • 1
    Monograph available for loan
    Monograph available for loan
    Mathematical modelling of environmental and ecological systems : excerpts form an international symposium on 'mathematical modelling of ecological, environmental and biological systems', held from august 27.-30., 1985 in kanpur, india (1987)
    Amsterdam [u.a.] : Elsevier
    Associated volumes
    Details Availability
    Call number: PIK M 370-92-0645
    In: Developments in environmental modelling
    Type of Medium: Monograph available for loan
    Pages: XXI, 254 S. : graph. Darst.
    ISBN: 0444428070
    Series Statement: Developments in environmental modelling
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Prediction of interannual climate variations : [proceedings of the NATO Advanced Research Workshop on Prediction of Interannual Climate Variations held at Trieste, Italy, July 22-26, 1991] (1993)
    Berlin [u.a.] : Springer
    Associated volumes
    Details Availability
    Call number: 12/M 93.0761 ; 12/M 93.1035 ; 12/M 94.0327 ; 12/M 98.0138 ; AWI A3-93-0215
    In: NATO ASI Series
    Type of Medium: Monograph available for loan
    Pages: 265 S.
    ISBN: 3540545913
    Series Statement: NATO ASI series : I, Global and environmental change 6
    Classification:
    Meteorology and Climatology
    Language: English
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: AWI Library
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  • 3
    Electronic Resource
    Electronic Resource
    Microwave method for measurement of liquid film thickness in gas– liquid flow (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 952-956 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple microwave technique is described that accurately measures the instantaneous, local thickness of a film of liquid flowing down the inner wall of a tube while at the same time an adjacent current of gas flows in the opposite direction. Such a nonintrusive measurement technique is significant because of the extensive occurrence of similar liquid/gas flows in chemical process and energy systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138841
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of convective and dispersive migration on the linear stability of a two species system with mutualistic interactions and functional response (1982)
    Springer
    Bulletin of mathematical biology 44 (1982), S. 271-282 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract In this paper, effects of convective and dispersive migration on the linear stability of the equilibrium state of a two species system with mutualistic interactions and functional response have been investigated. In both finite and semi-infinite habitats, it has been shown that the otherwise stable equilibrium state without dispersal remains so with dispersal also, both under flux and reservior conditions. In the case of finite habitat, the degree of stability increases as dispersal coefficients of the two species increase. The effect of convective migration also is to stabilize the equilibrium state in this case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02463251
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of stenosis on non-newtonian flow of the blood in an artery (1980)
    Springer
    Bulletin of mathematical biology 42 (1980), S. 283-294 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract It has been shown that the resistance of flow and the wall shear increase with the size of the stenosis but these increases are comparatively small due to non-Newtonian behaviour of the blood indicating the usefulness of its rheological character in the functioning of the diseased arterial circulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460787
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of peripheral layer viscosity on blood flow through the artery with mild stenosis (1980)
    Springer
    Bulletin of mathematical biology 42 (1980), S. 797-805 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The effects of peripheral layer viscosity on physiological characteristics of blood flow through the artery with mild stenosis have been studied. It has been shown that the resistance to flow and the wall shear decrease as the peripheral layer viscosity decreases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02461059
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of convective and dispersive interactions on the stability of two species (1981)
    Springer
    Bulletin of mathematical biology 43 (1981), S. 593-610 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The evolution and local stability of a system of two interacting species in a finite two-dimensional habitat is investigated by taking into account the effects of self- and cross-dispersion and convection of the species. In absence of cross-dispersion, an equilibrium state which is stable without dispersion is always stable with dispersion provided that the dispersion coefficients of the two species are equal. However, when the dispersion coefficients of the two species are different, the possibility of self-dispersive instability arises. It is also pointed out that the cross-dispersion of species may lead to stability or instability depending upon the nature and the magnitude of the cross-dispersive interactions in comparison to the self-dispersive interactions. The self-convective movement of species increases the stability of the equilibrium state and can stabilize an otherwise unstable equilibrium state. The effect of cross-convection (in absence of self-dispersion and self-convection) is to stabilize the equilibrium state in a prey-predator model with positive cross-dispersion coefficients for the prey species. Finally, it is shown that if the system is stable under homogeneous boundary conditions it remains so under non-homogeneous boundary conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02462315
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  • 8
    Electronic Resource
    Electronic Resource
    Dispersion in non-Newtonian fluids: Effects of chemical reaction (1979)
    Springer
    Rheologica acta 18 (1979), S. 740-748 
    Details
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Die Verteilung eines gelösten Stoffes in nicht-newtonschen Flüssigkeiten, die durch Kanäle und Rohre fließen, wird unter Zugrundelegung einer homogenen chemischen Reaktion erster Ordnung untersucht. Es wird gezeigt, daß bei gleicher mittlerer Strömungsgeschwindigkeit der äquivalente Verteilungskoeffizient abnimmt, wenn die Reaktionsgeschwindigkeit zunimmt. Diese Abnahme wird bei nicht-newtonschen Flüssigkeiten noch verstärkt.
    Notes: Summary The dispersion of a solute in non-Newtonian fluids flowing through channels and pipes has been studied by taking into account the homogeneous first-order chemical reaction. It is shown that for the same mean velocity of the flow the equivalent dispersion coefficient decreases as the rate of the chemical reaction increases. This decrease is enhanced due to non-Newtonian nature of the fluid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01533349
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  • 9
    Electronic Resource
    Electronic Resource
    Proton dissociation constants of benzoylacetone and isonitrosobenzoylacetone in aqueous dioxane media (1987)
    Springer
    Monatshefte für Chemie 118 (1987), S. 931-946 
    Details
    ISSN: 1434-4475
    Keywords: Dielectric constants ; Ionization constants ; Mixed solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die thermodynamischen Protonen-Dissoziationskonstanten (TpKa) von Benzoylaceton (HBA) und Isonitrosobenzoylaceton (HINBA)pH-metrisch in 10–50% (v/v) Dioxan-Wasser-Mischungen bei 25 und 35 ± 0.01°C bestimmt, wobei eine empirischepH-Korrektur für das gemischt-wäßrige Medium angewendet wurde. DiepKa-Werte in wäßrigem Medium (0% Dioxan) folgen aus der Extrapolation und der Methode kleinster Fehlerquadrate. SowohlHBA als auchHINBA sind sehr schwache monoprotische Säuren mitTpKa zwischen 7.0 und 10.0. DieTpKa's variieren nicht linear mit der reziproken Dielektrizitätskonstante des Mediums, ein DiagrammTpKa gegen Molenbruch Dioxan ergibt jedoch für eine konstante Temperatur eine Gerade. Die „wahre Konstante“Ka' und die Solvatationszahln des Ausdrucks (H+)(A −)/(HA)=Ka'(S) n =Ka* wurde aus den experimentellen Daten für beide Reagentien errechnet. Die thermodynamischen Parameter ΔG°, ΔH° und ΔS° wurden ebenfalls bestimmt, Temperatur- und Lösungsmitteleffekte werden diskutiert.
    Notes: Abstract Thermodynamic proton dissociation constants,TpKa of benzoylacetone(HBA) as well as isonitrosobenzoylacetone (HINBA) have been determinedpH-metrically in 10–50% (v/v) dioxane-water mixtures at 25 and 35±0.01°C applying an empiricalpH correction for mixed aqueous media. ThepKa's in aqueous medium (at 0% dioxane) are obtained following the method of extrapolation and least-squares. BothHBA andHINBA are very weak monoprotic acids withTpKa between 7.0 and 10.0.TpKa's do not vary linearly with the reciprocal of the dielectric constant of the medium, but a plot ofTpKa vs. the mole fraction of dioxane is linear at a given temperature. The “true constant”Ka' and solvation number,n, in the expression (H+)(A −)/(HA)=Ka' (S) n =Ka* for these reagents have been evaluated by analysing the experimental data mathematically. Values of ΔG 0, ΔH 0, and ΔS 0 are also computed. Temperature and medium effects are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00815320
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  • 10
    Electronic Resource
    Electronic Resource
    Study on complex formation equilibria of tervalent lanthanons with fluorinated β-ketoesters in aqueous dioxane medium (1994)
    Springer
    Monatshefte für Chemie 125 (1994), S. 247-258 
    Details
    ISSN: 1434-4475
    Keywords: Complexation ; Formation constant ; Lanthanons ; β-Ketoesters ; Activity coefficients ; Speciation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die thermodynamischen stufenweisen Komplexbildungskonstanten (log T K n) von 9 dreiwertigen Lanthanoiden (La3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Er3+ und Lu3+) mit drei fluorierten β-Ketoestern (Methyltrifluoracetoacetat, Ethyltrifluoracetoacetat und Ethylpentafluopropionylacetat) in 50% Dioxan-Wasser bei 25 und 35±0.01 °C potentiometrisch bestimmt. Die Werte für log T K n ergeben keine lineare Abhängigkeit gegenüberZ/r, sie gehorchen stets der Reihenfolge: La3+ 〈 Nd3+ 〈 Pr3+ 〈 Sm3+ 〈 Gd3+ 〈 Eu3+ 〈 Dy3+ ≤ Er3+ ≤ Lu3+. Die thermodynamischen Standardparameter ΔG 1 0 , ΔH 1 0 und ΔS 1 0 wurden ebenfalls berechnet. Die Gültigkeit des gewählten Gleichgewichtsmodells wurde unter Verwendung der Summe der Quadratreste (S min), von Streukurven und Steigung/Ordinatenabschnitt der Normalwahrscheinlichkeitsdarstellung nach Abrahams-Kave untersucht.
    Notes: Summary The thermodynamic stepwise formation constants (log T K n) of nine tervalent lanthanons (La3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Er3+ and Lu3+) with three fluorinated β-ketoesters (methyltrifluroacetoacetate, ethyltrifluoroacetoacetate, and ethylpentafluoropropionylacetate) have been evaluated potentiometrically in a 50% dioxane-water mixture at 25 and 35 ± 0.01 °C. The values of log T K n do not follow a linearity when plotted againstZ/r and invariably obey the sequence: La3+ 〈 Nd3+ 〈 Pr3+ 〈 Sm3+ 〈 Gd3+ 〈 Eu3+ 〈 Dy3+ ≤ Er3+ ≤ Lu3+ in all instances. The standard thermodynamic parameters (ΔG 1 0 , ΔH 1 0 , ΔS 1 0 ) associated with log T K n have also been calculated. The validity of the chosen equilibrium model was examined by an error analysis usingS min values (sum of the squared residuals), scatter plots, and slopes and intercepts of Abrahams-Kave type normal probability plots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811310
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