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  • 1
    Electronic Resource
    Electronic Resource
    Preliminary Results of the Air Force Infrared Sky Survey (1981)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 19 (1981), S. 411-456 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.19.090181.002211
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  • 2
    Electronic Resource
    Electronic Resource
    A reconstruction method for a two-dimensional inverse eigenvalue problem (1994)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 45 (1994), S. 794-826 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract In this paper we describe a method for constructing approximate solutions of a two-dimensional inverse eigenvalue problem. Here we consider the problem of recovering a functionq(x, y) from the eigenvalues of — Δ +q(x, y) on a rectangle with Dirichlet boundary conditions. The potentialq(x, y) is assumed to be symmetric with respect to the midlines of the rectangle. Our method is a generalization of an algorithm Hald presented for the construction of symmetric potentials in the one-dimensional inverse Sturm-Liouville problem. Using a projection method, the inverse spectral problem is reduced to an inverse eigenvalue problem for a matrix. We show that if the given eigenvalues are small perturbations of simple eigenvalues ofq=0, then the matrix problem has a solution. This solution is used to construct a functionq which has the same lowest eigenvalues as the unknownq, and several numerical examples are given to illustrate the methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00942754
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  • 3
    Electronic Resource
    Electronic Resource
    Pressure dependence of the electric field gradient in Sb and Sb1−x M x (M=ln, Zn, Ge, Pb, Cd, Sn) at the site of111Cd (1995)
    Springer
    The European physical journal 97 (1995), S. 493-497 
    Details
    ISSN: 1434-6036
    Keywords: 31.30 G ; 61.70 Y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the111Cd-TDPAC (time differential perturbated angular correlation) method, the pressure dependence of the electric field gradient (EFG) in Sb and Sb1−x M x (M=ln, Zn, Ge, Pb, Cd, Sn) was investigated. The application of a phenomenological ansatz for the parametrisation of the pressure and temperature dependence of the EFG made it possible to combine temperature data gained in former studies [1], [2] with the pressure dependent data presented in this paper. The resulting pressure dependence of −2±0.2 MHz/kbar is shown to be independent of concentration and element of admixture. Results for the volume and explicit temperature dependence agree with existing information on the mixed system Sb1−x M x (M=ln, Zn, Ge, Pb, Cd, Sn); the investigation of the EFG in Sb1−x−y M x Pb y showed that the resulting EFG may be interpreted as the weighted sum of the individual contributions of the two metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01322429
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  • 4
    Electronic Resource
    Electronic Resource
    Extremal eigenvalue problems for composite membranes, I (1990)
    Springer
    Applied mathematics & optimization 22 (1990), S. 153-167 
    Details
    ISSN: 1432-0606
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Given an open bounded connected set Ω ⊂R N and a prescribed amount of two homogeneous materials of different density, for smallk we characterize the distribution of the two materials in Ω that extremizes thekth eigenvalue of the resulting clamped membrane. We show that these extremizers vary continuously with the proportion of the two constituents. The characterization of the extremizers in terms of level sets of associated eigenfunctions provides geometric information on their respective interfaces. Each of these results generalizes toN dimensions the now classical one-dimensional work of M. G. Krein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447325
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  • 5
    Electronic Resource
    Electronic Resource
    Extremal eigenvalue problems for composite membranes, II (1990)
    Springer
    Applied mathematics & optimization 22 (1990), S. 169-187 
    Details
    ISSN: 1432-0606
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Given an open bounded connected set Ω ⊂R N and a prescribed amount of two homogeneous materials of different density, for smallk we characterize the distribution of the two materials in Ω that extremizes thekth eigenvalue of the resulting clamped membrane. We show that these extremizers vary continuously with the proportion of the two constituents. The characterization of the extremizers in terms of level sets of associated eigenfunctions provides geometric information on their respective interfaces. Each of these results generalizes toN dimensions the now classical one-dimensional work of M. G. Krein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447326
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  • 6
    Electronic Resource
    Electronic Resource
    Solubility of anthracene in binary alcohol + 1-pentanol solvent mixtures at 25°C: Comparison of expressions derived from Mobile Order theory and the Kretschmer-Wiebe association model (1996)
    Springer
    Journal of solution chemistry 25 (1996), S. 1001-1017 
    Details
    ISSN: 1572-8927
    Keywords: Anthracene solubilities ; hydrogen-bonding ; self-association ; solid-liquid equilibria ; binary alkanol solvent mixtures ; 1-pentanol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A relatively simple expression is developed for predicting the solubility of an inert crystalline solute in binary alcohol + alcohol solvent mixtures based upon the Kretschmer-Wiebe association model. The predictive accuracy of the newlyderived expression is compared to equation(s) derived previously from Mobile Order theory using experimental anthracene solubilities in seven binary alcohol + 1-pentanol solvent mixtures at 25°C, which were measured as part of the present investigation. Computations show that both models accurately describe the solubility behavior of anthracene in the binary solvent systems studied. Average absolute deviations between observed and predicted values were 0.9% and 1.4% for the Kretschmer-Wiebe and Mobile Order predictive equations, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972595
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  • 7
    Electronic Resource
    Electronic Resource
    Thermochemical investigations of hydrogen-bonded solutions. Part 11. Expressions for predicting anthracene solubilities in alcohol+alkoxyalcohol mixtures based on mobile order theory (1996)
    Springer
    Journal of solution chemistry 25 (1996), S. 1089-1104 
    Details
    ISSN: 1572-8927
    Keywords: Anthracene solubilities ; hydrogen-bonding ; self-association ; solid-liquid equilibria ; binary alcohol+alkoxyethanol solvent mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Experimental solubilities are reported for anthracene dissolved in eight binary mixtures containing 2-ethoxyethanol with 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol, 1-pentanol, 3-methyl-1-butanol and 1-octanol, and also in binary 1-pentanol+2-methoxyethanol and 2-methyl-1-propanol+2-propoxyethanol solvent systems at 25°C. Results of these measurements, combined with previously reported anthracene solubility data in 22 different alcohol +2-alkoxyethanol (2-methoxyethanol, 2-propoxyethanol and 2-butoxyethanol) solvent mixtures, are used to test the limitations and applications of expressions derived from Mobile Order theory. The first predictive expression assumes only formation of homogeneous self-associated hydrogen-bonded species, whereas the second equation includes additional terms to account for heterogeneous complex formation between the dissolved alcohol and 2-alkoxyethanol solvent molecules. Both equations predict the observed anthracene solubilities to within an average absolute deviation of about 3%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972924
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  • 8
    Electronic Resource
    Electronic Resource
    Solubility of benzil in binary alkane + dibutyl ether solvent mixtures. Comparison of predictive expressions derived from the nearly ideal binary solvent model (1996)
    Springer
    Journal of solution chemistry 25 (1996), S. 295-302 
    Details
    ISSN: 1572-8927
    Keywords: Benzil solubilities ; binary solvent mixtures ; predictive expressions ; solubility predictions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Experimental solubilities are reported for benzil dissolved in six binary mixtures containing dibutyl ether with hexane, heptane, octane, cyclohexane, methylcyclohexane, and 2,2,4-trimethylpentane at 25°C. Results of these measurements are compared to the predictions of equations developed previously for solubility in systems of nonspecific interactions. The most successful equation in terms of goodness of fit involved a volume fraction average of the excess Gibbs energies relative to the Flory-Huggins model, and predicted the experimental solubilities in the six systems studied to within an overall average absolute deviation of 3.4% and with a maximum deviation of 6.0%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972527
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  • 9
    Electronic Resource
    Electronic Resource
    Darwinian Ethics and Error (2000)
    Springer
    Biology and philosophy 15 (2000), S. 713-732 
    Details
    ISSN: 1572-8404
    Keywords: Darwin ; error theory ; ethics ; evolution ; evolutionary ethics ; Mackie ; naturalistic fallacy ; Ruse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Philosophy
    Notes: Abstract Suppose that the human tendency to think of certain actions andomissions as morally required – a notion that surely lies at the heart of moral discourse – is a trait that has been naturallyselected for. Many have thought that from this premise we canjustify or vindicate moral concepts. I argue that this is mistaken, and defend Michael Ruse's view that the moreplausible implication is an error theory – the idea thatmorality is an illusion foisted upon us by evolution. Thenaturalistic fallacy is a red herring in this debate,since there is really nothing that counts as a ‘fallacy’ at all. If morality is an illusion, it appears to followthat we should, upon discovering this, abolish moraldiscourse on pain of irrationality. I argue that thisconclusion is too hasty, and that we may be able usefullyto employ a moral discourse, warts and all, withoutbelieving in it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006742813396
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  • 10
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    Extremal eigenvalue problems for composite membranes, II (1990)
    Springer
    Details
    Publication Date: 1990-07-01
    Print ISSN: 0095-4616
    Electronic ISSN: 1432-0606
    Topics: Mathematics
    Published by Springer
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