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  • Articles  (171)
  • Springer  (171)
  • Chemistry and Pharmacology  (137)
  • Mathematics  (32)
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  • Articles  (171)
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  • 1
    Electronic Resource
    Electronic Resource
    Bounds on spectral condition numbers of matrices arising in the $p$ -version of the finite element method (1995)
    Springer
    Numerische Mathematik 69 (1995), S. 333-352 
    Details
    ISSN: 0945-3245
    Keywords: Mathematics Subject Classification (1991):65N30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary. We estimate condition numbers of $p$ -version matrices for tensor product elements with two choices of reference element degrees of freedom. In one case (Lagrange elements) the condition numbers grow exponentially in $p$ , whereas in the other (hierarchical basis functions based on Tchebycheff polynomials) the condition numbers grow rapidly but only algebraically in $p$ . We conjecture that regardless of the choice of basis the condition numbers grow like $p^{4d}$ or faster, where $d$ is the dimension of the spatial domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002110050096
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  • 2
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    Effect of marine oils supplementation on coagulation and cellular activation in whole blood (1995)
    Springer
    Details
    Publication Date: 1995-12-01
    Print ISSN: 0024-4201
    Electronic ISSN: 1558-9307
    Topics: Biology , Chemistry and Pharmacology
    Published by Springer
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    PAPER CURRENT
  • 3
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    Bounds on spectral condition numbers of matrices arising in the $p$ -version of the finite element method (1995)
    Springer
    Details
    Publication Date: 1995-01-01
    Print ISSN: 0029-599X
    Electronic ISSN: 0945-3245
    Topics: Mathematics
    Published by Springer
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    A mathematical model for fibro-proliferative wound healing disorders (1996)
    Springer
    Bulletin of mathematical biology 58 (1996), S. 787-808 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The normal process of dermal wound healing fails in some cases, due to fibro-proliferative disorders such as keloid and hypertrophic scars. These types of abnormal healing may be regarded as pathologically excessive responses to wounding in terms of fibroblastic cell profiles and their inflammatory growth-factor mediators. Biologically, these conditions are poorly understood and current medical treatments are thus unreliable. In this paper, the authors apply an existing deterministic mathematical model for fibroplasia and wound contraction in adult mammalian dermis (Olsenet al., J. theor. Biol. 177, 113–128, 1995) to investigate key clinical problems concerning these healing disorders. A caricature model is proposed which retains the fundamental cellular and chemical components of the full model, in order to analyse the spatiotemporal dynamics of the initiation, progression, cessation and regression of fibro-contractive diseases in relation to normal healing. This model accounts for fibroblastic cell migration, proliferation and death and growth-factor diffusion, production by cells and tissue removal/decay. Explicit results are obtained in terms of the model processes and parameters. The rate of cellular production of the chemical is shown to be critical to the development of a stable pathological state. Further, cessation and/or regression of the disease depend on appropriate spatiotemporally varying forms for this production rate, which can be understood in terms of the bistability of the normal dermal and pathological steady states—a central property of the model, which is evident from stability and bifurcation analyses. The work predicts novel, biologically realistic and testable pathogenic and control mechanisms, the understanding of which will lead toward more effective strategies for clinical therapy of fibro-proliferative disorders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459482
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  • 5
    Electronic Resource
    Electronic Resource
    Book reviews (1997)
    Springer
    Bulletin of mathematical biology 59 (1997), S. 197-204 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459475
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  • 6
    Electronic Resource
    Electronic Resource
    Nickel ferrite as inert anodes in aluminium electrolysis: Part I Material fabrication and preliminary testing (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 293-299 
    Details
    ISSN: 1572-8838
    Keywords: aluminium ; cermet ; electrode ; electrolysis ; inert ; NiFe2O4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Dense, sintered samples of nickel ferrite/nickel oxide–copper cermets were produced and characterized. Three compositions were chosen, each with different NiO content. A new method of powder preparation involving no use of water as dispersant resulted in a well-dispersed ceramic phase with smaller metal grains than previously reported. The individual phases in the cermets were analysed quantitatively using energy-dispersive X-ray microanalysis, and significant differences between the materials were found. The electrical conductivity of the materials was measured, showing interesting properties not previously described. Reaction sintering was tried and found to lead to a microstructure different from that obtained with pre-calcined powder. The nickel contamination level in the electrolyte did not reach steady state after 4h of electrolysis. Iron and copper did seem to reach steady state after some irregular behaviour early in the tests. The total contamination level of anode constituents in the deposited metal was as low as 0.116wt%. These encouraging results seemed to be partly related to the cell configuration giving very slow mass transfer from the electrolyte into the metal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003460220418
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  • 7
    Electronic Resource
    Electronic Resource
    Nickel ferrite as inert anodes in aluminium electrolysis: Part II Material performance and long-term testing (1999)
    Springer
    Journal of applied electrochemistry 29 (1999), S. 301-311 
    Details
    ISSN: 1572-8838
    Keywords: aluminium ; cermet ; electrode ; electrolysis ; inert ; NiFe2O4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The behaviour of three different compositions based on nickel ferrite–nickel oxide–copper cermets was investigated as anode materials in laboratory electrolysis tests for 50h in a conventional cryolite-based electrolyte. The corrosion of the anodes was assumed to be mass transfer controlled and the transfer of impurities into the electrolyte and subsequently into the cathodically deposited metal was studied. The results indicate that the materials corroded in a controlled manner. Mass transfer coefficients of species from the anode to the electrolyte were of the order of 10−4ms−1 while the mass transfer coefficients for transfer of the species from the electrolyte into the deposited metal were of the order of 10−6ms−1. Nickel exhibited significantly lower mass transfer coefficients than those of iron and copper. The extrapolated corrosion rates of the anode ranged 1.2–2.0 cm year−1, which is acceptable from an industrial perspective. The contamination of the deposited aluminium with respect to Ni and Cu was, however, too high to meet current specifications for commercial grade metal. Post-electrolysis examination of the anodes showed that a reaction layer of approximately 50μm thickness was formed on the anodes. This layer did not contain any metal grains and seemed to prevent preferential corrosion of the metal phase in the underlying cermet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003464304488
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  • 8
    Electronic Resource
    Electronic Resource
    Greenhouse gas abatement — toward Pareto-optimal decisions under uncertainty (1996)
    Springer
    Annals of operations research 68 (1996), S. 267-279 
    Details
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract This paper examines the economic logic of integrated assessment — balancing the costs against the benefits of greenhouse gas abatement. “Stylized facts” are employed in a multiregion computable general equilibrium model with a public good. The percentage shares of global emissions are determined outside the model — based upon some form of international agreement — and emission rights are tradeable between regions. The analysis is confined to Pareto-optimal (cooperative) solutions. We focus on the sensitivity of initial decisions to low-probability, high-consequence scenarios associated with cumulative emissions. For simplicity, there are only two regions, two tradeable goods, two time periods, and two states-of-world. With the particular form of public good model adopted here (production rather than utility function impacts), it turns out that a Pareto-optimal hedging strategy is indepedent of the emission shares allocated to each region. Equity issues may be separated from those of economic efficiency. Similar results extend to cases in which there are additional regions, tradeable goods, time periods, and states-of-world.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02209615
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  • 9
    Electronic Resource
    Electronic Resource
    Polymer electrolyte lithium batteries rechargeability and positive electrode degradation: An AC impedance study (1991)
    Springer
    Journal of applied electrochemistry 21 (1991), S. 301-307 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract AC impedance measurements of polymer electrolyte-based, symmetrical composite cathode cells were used to probe the effects of the composite cathode composition and fabrication process upon its performance when used in polymer electrolyte-based thin film rechargeable lithium batteries. The relationship between cycling performance and AC impedance measurements were used to elucidate some of the reported failure mechanisms of rechargeable lithium polymer electrolyte batteries. The rapid initial capacity decay observed within the first few cycles of the polymer electrolyte/V6O13 based composite cathode is shown to be related to the properties of the composite cathode active material, while the slower capacity decay observed during subsequent cycles, under continuous cycling regimes, appears to be related to a loss of ionic and electronic contact in the composite cathode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020212
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  • 10
    Electronic Resource
    Electronic Resource
    Analysis of elastic structures on digital computers (1963)
    Springer
    BIT 3 (1963), S. 257-272 
    Details
    ISSN: 1572-9125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A brief survey of a general method for the analysis of elastic structures is given. The matrices involved are described for certain classes of structures in terms of basic data. Some methods for taking advantage of the general, simplifying pattern of the matrices when programming for an electronic computer are mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01956865
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