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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 106 (1991), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We analyse a new model to estimate the change in gravity and in elevation caused by volcanic eruption or inflation. In the new model, a permeable, porous zone surrounds a spherical magma chamber. Magma may enter or leave the magma chamber and, independently, the permeable zone. This arrangement simulates the flow processes inferred from field studies, and provides a degree of freedom not available in the classic model proposed by Mogi and used by many others since then. We find, in agreement with field data and previous analyses of the Mogi model, that the change in edifice volume is smaller than the volume of magma which produces it. The local change in gravity is found to be proportional to the local elevation change, the constant of proportionality being positive or negative, depending on whether magma flow is directed into or out of the chamber or infiltrated zone.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 114 (1976), S. 1135-1137 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 113 (1975), S. 97-106 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Deformation causes changes in gravity even though the measuring station is fixed relative to the center of the earth and the total mass in the vicinity of the station does not change. Deformation has two effects: the density at a point changes in response to changes in local stresses and the point itself moves relative to the station. The general expression derived here shows that the gravity change depends on the uplift immediately beneath the station and the deformation of cavities at depth — cracks, pores, magma reservoirs, etc. The approximation is made that density is uniform except for cavities, but no assumptions about the constitutive behavior of the medium are necessary. The gravity change studied here shows interesting analogies with the gravity effect due to buried bodies with anomalous density. For example, I find that the net volume change due to deformation can be found by integrating the gravity anomaly over the earth's surface, in analogy with the calculations for excess mass. The theory is especially useful when both deformation and net fluid flow into or out of the system occurs. The results are applied to uplift and gravity changes observed during the great Alaskan earthquake, the Matsushiro earthquake swarm, and a draw-down operation at the Wairakei geothermal field. The data at Wairakei are used to estimate the net amount of water taken from the aquifer. The data at Matsushiro is not sufficiently precise to discriminate between the various mechanisms that have been proposed, but the Alaskan earthquake data suggest that no dilatancy or fluid flow occurred between the survey in 1962 and the resurvey in 1964 just after the event.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 62 (1998), S. 300-302 
    ISSN: 1432-0827
    Keywords: Key words: Vitamin D — Fortified — Milk — Elderly.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. To assess the efficacy and acceptability of vitamin D-fortified liquid milk in the management of hypovitaminosis D we carried out a double-blind, randomized, controlled trial on 51 community-based, elderly subjects with serum 25 hydroxyvitamin D (25OHD) levels of less than 12.9 ng/ml (normal range 10–80 ng/ml). Each subject had a dietary assessment, mental test score, outdoor score, serum 25 hydroxyvitamin D level, and a general biochemical screening at baseline in April 1993 which was repeated in September 1993, April 1994, and September 1994. All subjects received 500 ml of milk per day, delivered to their homes in specially manufactured, blank, tetrapak cartons, from June 1993 to June 1994: 23 subjects received unfortified milk (control group) and 28 subjects received fortified milk (active group). Our results showed a baseline mean 25OHD level in the active group of 9.6 (range 〈 5.5–12.7) ng/ml and in the control group of 10.0 (range 〈 5.5–12.9) ng/ml (P 〈 0.4). One year later the mean 25OHD level in the active group had risen significantly from its baseline to 18.5 (range 9.6–26.7) ng/ml (P 〈 0.001) and was significantly different from the control group with a 1-year mean of 12.7 (range 〈 4–24.1) ng/ml (P 〈 0.001). Serum calcium levels in the active group also showed a significant rise over the 1-year period (P 〈 0.001) whereas those in the control group did not. We conclude that vitamin D-fortified liquid milk is a safe, effective, and acceptable method of administering vitamin D to the elderly, community-based population.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Probability theory and related fields 44 (1978), S. 279-306 
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Inventiones mathematicae 14 (1971), S. 143-166 
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Inventiones mathematicae 19 (1973), S. 113-148 
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Probability theory and related fields 88 (1991), S. 363-379 
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary McGill showed that the intrinsic local time process $$\tilde L$$ (t, x), t ≧ 0, x ∈ ℝ, of one-dimensional Brownian motion is, for fixedt〉0, a supermartingale in the space variable, and derived an expression for its Doob-Meyer decomposition. This expression referred to the derivative of some process which was not obviously differentiable. In this paper, we provide an independent proof of the result, by analysing the local time of Brownian motion on a family of decreasing curves. The ideas involved are best understood in terms of stochastic area integrals with respect to the Brownian local time sheet, and we develop this approach in a companion paper. However, the result mentioned above admits a direct proof, which we give here; one is inevitably drawn to look at the local time process of a Dirichlet process which is not a semimartingale.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mathematical biology 28 (1990), S. 21-31 
    ISSN: 1432-1416
    Keywords: Quantitative genetics ; Natural selection ; Stability analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Inconsistencies exist in the standard expansions used to approximate selection coefficients for alleles at a locus underlying a quantitative character. Allelic (marginal) fitnesses obtained from expansions based on average excesses differ from allelic fitnesses obtained from expansions based on genotypic values. Similarly, $$\bar W$$ the mean population fitness based on summing over either allelic or genotypic fitnesses usually differs mean population fitness obtained by averaging over the unrestricted phenotypic distribution. A consistent value of $$\bar W$$ requires no variation in genotypic values. If, as suggested by Nagylaki (1984), expansions are corrected for the decrease in phenotypic variance resulting from conditioning on the presence of a particular allele or genotype, inconsistencies still exist. Unless ∫ W(z)[V z p″(z) + zp′(z) + p(z)] dz = 0, where p(z) is the phenotypic probability density function, V z the phenotypic variance, W( z ) the fitness of phenotypic value z, the primes denote differentiation with respect to z, allelic fitnesses based on average effects differ from allelic fitnesses based on genotypic values. This condition must also be satisfied in order for either expansion to give a consistent $$\bar W$$ , as first shown by Nagylaki. For arbitrary W(z), this is satisfied if and only if phenotypes are normally distributed.
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  • 10
    Publication Date: 1993-02-01
    Print ISSN: 0967-3334
    Electronic ISSN: 1361-6579
    Topics: Medicine , Physics
    Published by Institute of Physics
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