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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Air-sea-land interactions: Global and regional habitability (1985)
    Springer
    Origins of life and evolution of the biospheres 15 (1985), S. 353-363 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract We first suggest that the air-sea interactions and the air-land interactions are the most important mechanisms for thechanges in the atmosphere-ocean-biosphere system at the time-scales of 10−1–102 years. Due to very wide range of space and time-scales at which these interactions operate, and because of their nonlinearities, considerable interannual fluctuations can be produced even without any external (or anthropogenic) forcing. We present some examples of the observed changes in the atmosphere, ocean and land surface properties and describe the abilities and limitations of our current models to simulate these changes. We propose a method for calculating the ‘natural variability’ of the atmosphere-ocean-biosphere system and suggest possible techniques for detecting the changes caused by external anthropogenic factors. It is obvious that we are going to be limited in our ability to detect the changes due to external or anthropogenic factors unless we clearly understand the structure and the magnitude of the natural variability of the atmosphere-ocean-biosphere system. We further suggest that much before we are faced with the problems of global habitability, there will be severe problems of regional habitability. This occurs either due to regional nature of the forcing functions or amplified regional response of a global forcing function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01808179
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  • 9
    Electronic Resource
    Electronic Resource
    Barotropic-Baroclinic instability of mean zonal wind during summer monsoon (1977)
    Springer
    Pure and applied geophysics 115 (1977), S. 1449-1461 
    Details
    ISSN: 1420-9136
    Keywords: Monsoon ; Mean zonal wind ; Barotropic-baroclinic instability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Barotropic-Baroclinic instability of horizontally and vertically shearing mean monsoon flow during July is investigated numerically by using a 10-layer quasi-geostrophic model. The most unstable mode has a wavelength of about 3000 km and westward phase speed of about 15 m sec−1. The most dominant energy conversion is from zonal kinetic energy to eddy kinetic energy. The structure of the most unstable mode is such that the maximum amplitude is concentrated at about 150 mb and the amplitude at the lowest layers is negligibly small. Barotropic instability of the zonal flow at 150 mb seems to be the primary excitation mechanism for the most unstable mode which is also similar to the observed westward propagating waves in the upper troposphere during the monsoon season. The results further suggest that Barotropic-Baroclinic instability of the mean monsoon flow cannot explain the occurrence of monsoon depressions which have their maximum amplitude at the lower levels and are rarely detected at 200 mb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00874418
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on biosynthesis of sucrose (1960)
    Springer
    Cellular and molecular life sciences 16 (1960), S. 202-203 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Du jus de canne à sucre, les auteurs ont extrait un enzyme, le sucrose phosphorylase, qui diffère des enzymes tirés jusqu'ici dePseudomonas saccharophilia par certaines propriétés caractéristiques. La présente note étudie ces propriétés et donne la détermination de leurs constantes physiques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02178990
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