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  • Springer  (232)
  • Elsevier  (40)
  • Wiley-Blackwell  (8)
  • American Meteorological Society  (5)
  • Oxford University Press  (5)
  • 1990-1994  (161)
  • 1985-1989  (129)
  • 1
    Electronic Resource
    Electronic Resource
    Distribution of stresses in the left ventricular wall of the intact heart (1985)
    Springer
    Bulletin of mathematical biology 47 (1985), S. 53-70 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The left ventricle is modelled as a prolate spheroid of viscoelastic material with an aim to demonstrate the qualitative effects of anistropy and nonhomogeneity in the calculation of intact ventricular wall stresses. The pericardial pressure is accounted for in the analysis and an attempt is made to examine to what extent this influences the ventricular stresses. Numerical results are also obtained by computing the analytical expressions derived through the analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459646
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  • 2
    Electronic Resource
    Electronic Resource
    A study on the non-linear flow of blood through arteries (1987)
    Springer
    Bulletin of mathematical biology 49 (1987), S. 257-277 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The pulsatile flow of blood through arteries is investigated in this paper by treating the blood vessel as a thin-walled anisotropic, non-linearly viscoelastic, incompressible circular cylindrical shell; nonlinearities of the flow of blood are also paid due consideration. The displacement components of the vessel wall are obtained from the equations of equilibrium which have been linearized by employing the principle of superimposition of a small deformation on a state of known finite deformation. The influence of the wall deformation on the flow properties of blood, has been accounted for by considering suitably formulated continuity conditions. A finitedifference scheme is employed for solving the flow equations together with the boundary and initial conditions by using the locally measured values of pressure and pressure gradient. Numerical results obtained for the velocity profile of blood flowing in a canine middle descending thoracic aorta have been presented through figures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460119
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  • 3
    Electronic Resource
    Electronic Resource
    Oxygen electroreduction in perfluorinated sulphonyl imides (1987)
    Springer
    Journal of applied electrochemistry 17 (1987), S. 1057-1064 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electroreduction of oxygen in perfluorinated sulphonyl imides has been studied with the emphasis on the identification of alternate acid electrolytes which could replace the presently used phosphoric acid as an electrolyte in H2−O2 fuel cells. The activity for oxygen reduction on smooth platinum and gas-fed, high surface area platinum-catalysed electrodes (10% platinum loading on XC-72 carbon support) has been examined. The polarization of the air cathode in the micro-fuel cell in bis(trifluoromethanesulphonyl)imide is 40 mV more positive compared to phosphoric acid at 100 mA cm−2, presumably due to the increased solubility of oxygen and lower tendency of bis(trifluoromethanesulphonyl)imide to adsorb on the platinum catalyst. The related bis(fluorosulphonyl)imide is unstable in water and the hydrolysis products adsorb strongly on the catalytic sites, resulting in poor performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024371
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation and characterization of thin films of LaNiO3 for anode application in alkaline water electrolysis (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 149-156 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract LaNiO3 electrodes were prepared, in the form of thin films on platinum by the methods of spray pyrolysis and sequential coating of mixed metal nitrate solutions followed by thermal decomposition. The films were adherent and of p-type semiconducting. Cyclic voltammetric studies indicated the formation of a quasireversible surface redox couple, Ni(iii)/Ni(ii), on these films before the onset of oxygen evolution in 1 m KOH. The anodic Tafel slopes were ∼40 and ∼65 mV decade−1, on the sprayed LaNiO3 film and on the film obtained by a layer method, respectively. The reaction order with respect to OH− was found to be 2.2 on the sprayed oxide film and 1.2 on the layer film. The sprayed oxide film was found to be electrocatalytically more active. It is suggested that the oxygen evolution reaction proceeds on both the film electrodes via the formation of the physisorbed H2O2 as an intermediate in the rate determining step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00247787
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  • 5
    Electronic Resource
    Electronic Resource
    Hg2+-induced leakage of electrolytes and inhibition of NO3 − utilization inNostoc calcicola (1990)
    Springer
    BioMetals 3 (1990), S. 208-212 
    Details
    ISSN: 1572-8773
    Keywords: Hg2+ toxicity ; Nostoc calcicola ; Electrolyte leakage ; NO3 − uptake ; Nitrate reductase ; Metal interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The effect of mercury (Hg2+) in the absence and presence of methylmercury (CH3Hg+), cadmium (Cd2+), copper (Cu2+), nickel (Ni2+) and calcium (Ca2+) on Nostoc calcicola Bréb. has been studied in terms of electrolyte leakage, NO3 − uptake and in vivo nitrate reductase (NR) activity to discover any possible correlation among such parameters under Hg2+ stress. Leakage of electrolytes from Hg2+-treated cyanobacterial cells was directly proportional to Hg2+ concentrations and exposure time. In comparison to NO3 − uptake, an about 60-fold slower rate of NR activity was observed in the untreated cultures, the former being five times more Hg2+-sensitive. A non-competitive synergistic interaction of Hg2+ with CH3Hg+ or Cd2+ and antagonistic with that of Ni2+ or Ca2+ has been observed for both the processes of NO3 − utilization. The antagonistic interaction of Cu2+ with Hg2+ in terms of NO3 − uptake and synergistic with respect to NR activity, has been attributed to the dual bonding preference of Cu2+ for cellular ligands. These findings suggest that (a) a statistically significant correlation exists among such parameters; (b) Hg2+ predominantly attacks the cyanobacterial cell membrane; (c) Hg2+ inhibits NO3 − utilization; (d) the presence of other cations increases or decreases the inhibitory actions of Hg2+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01140581
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  • 6
    Electronic Resource
    Electronic Resource
    Methyl mercury uptake by free and immobilized cyanobacterium (1992)
    Springer
    BioMetals 5 (1992), S. 229-234 
    Details
    ISSN: 1572-8773
    Keywords: biofilm ; cell aging ; cyanobacterium foam ; immobilization ; Nostoc calcicola ; spheres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Methyl mercury uptake in free cells and different immobilizates of the cyanobacteriumNostoc calcicola has been examined. The general growth of the immobilized cyanobacterial cells could be negatively correlated with methyl mercury uptake. Alginate spheres proved most efficient in terms of uptake rate (0.48 nmol mg protein−1 min−1, 10 min) and total bioaccumulation (10.71 nmol mg protein−1, 1 h) with a bioconcentration factor of 3.3×103. Alginate biofilms showed a faster methyl mercury accumulation rate (0.83 nmol mg protein−1 min−1, 10 min) with a saturation of 10.28 nmol mg protein−1 reached within only 30 min (bioconcentration factor, 3.1×103). Foam preparations with a slow initial uptake approximated biofilms but were characterized by a lower bioconcentration factor (2.8×103). Free cells, in comparison, maintained the initial slow rate of uptake (0.62 nmol mg protein−1 min−1, 10 min), saturating at 30 min (8.81 nmol mg protein−1), and the resultant lowest bioconcentration factor (2.7×103). Cell ageing (30 days) brought a drastic reduction (3-fold) in organomercury uptake by free cells while alginate spheres maintained the same potential. Foam preparations of the same age showed a significant improvement in methyl mercury uptake followed by only a marginal decline in alginate biofilms. Data are discussed in the light of the physiological efficiency and longevity of immobilized cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061223
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  • 7
    Electronic Resource
    Electronic Resource
    The geometrization of hydromagnetic fluid flows (1986)
    Springer
    Astrophysics and space science 124 (1986), S. 105-114 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper certain theorems of theoretical interest have been established with the help of the geometrical properties of Maxwellian surface (which is spanned by the flow and field lines). These theorems shed light on the behaviour of steady incompressible hydromagnetic flows. The complex-lamellar acceleration and simple geodesic motion admitted by such flows have also been studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649753
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of anisotropy and viscous dissipation on turbulence production (1985)
    Springer
    Astrophysics and space science 112 (1985), S. 209-212 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper is concerned with turbulent flow of incompressible, spatially homogeneous viscous fluid. A model for turbulence energy equation is obtained, ignoring the pressure redistribution term in dynamical equations for the Reynolds stresses. The mechanism of dissipation on turbulence production is discussed and shown that the turbulence kinetic energy decays upto a constant value as time becomes infinitely large, i.e., for isotropy, dissipation inhibits the production process and if $$\overline {u^2 } $$ 〉 $$\overline {\upsilon ^2 } $$ initially then dissipation causes reduction in anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00668422
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  • 9
    Electronic Resource
    Electronic Resource
    A statistical theory for the decay process of weak homogeneous convective turbulence (1985)
    Springer
    Astrophysics and space science 115 (1985), S. 267-274 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we have derived kinetic equations for the decay of kinetic and thermal energy of a weak homogenous turbulent flow in which the fluctuating temperature field is superimposed on the eddy velocity field. Random fluctuations of velocity and temperature in a one-dimensional model have been considered on the basis of wavenumbers in Fourier space together with linearized mode approximations. Energy decay equations have been obtained in closed form, using quasi-normal approximations and the Bogoliubov expansion method. The paper also discusses the cases off=v andf=0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653805
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  • 10
    Electronic Resource
    Electronic Resource
    Potentiometric studies on the chelation behaviour of lanthanons with 3-hydroxy-2-methyl-1,4-naphthoquinone (HMNQ) (1986)
    Springer
    Monatshefte für Chemie 117 (1986), S. 459-463 
    Details
    ISSN: 1434-4475
    Keywords: Potentiometry ; Stability constants ; Dissociation constant ; 3-Hydroxy-2-methyl-1,4-naphthoquinone ; Lanthanides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Komplexierungsverhalten der Komplexe von La(III), Pr(III), Nd(III), Y(III), Sm(III) und Tb(III) mit 3-Hydroxy-2-methyl-1,4-naphthochinon wurde potentiometrisch in 75% (v/v) wäßrigem Dioxan bei verschiedenen Ionenstärken untersucht. Die Methode vonBjerrum undCalvin in der Modifikation nachIrving undRossotti wurde zur Bestimmung der Werte für $$\mathop n\limits^ -$$ undpL benutzt. Es wurden die Stabilitätskonstanten und dieS min -Werte berechnet; die Stabilitätskonstanten ergaben folgende Reihung: La〈Pr〈Nd〈Sm〈Tb.
    Notes: Abstract The chelation behaviour of complexes of La(III), Pr(III), Nd(III), Y(III), Sm(III) and Tb(III) with 3-hydroxy-2-methyl-1,4-naphthoquinone has been studied potentiometrically in 75% (v/v) aqueous dioxan medium at various ionic strengths. The method ofBjerrum andCalvin, as modified byIrving andRossotti, has been used to find values of $$\mathop n\limits^ -$$ andpL. The stability constants and the values ofS min have been calculated. The order of stability constants was found to be: La〈Pr〈Nd〈Sm〈Tb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810894
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