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  • 1
    Electronic Resource
    Electronic Resource
    Exact self-gravitating disks and rings: A solitonic approach (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 165-170 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The Belinsky–Zakharov version of the inverse scattering method is used to generate a large class of solutions to the vacuum Einstein equations representing uniformly accelerating and rotating disks and rings. The solutions studied are generated from a simple class of static disks and rings that can be expressed in a simple form using suitable complex functions of the usual cylindrical coordinates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527800
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  • 2
    Electronic Resource
    Electronic Resource
    A Key Intermediate in the Synthesis of (+)-Hernandulcin (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 1579-1581 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010827019600008X
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  • 3
    Electronic Resource
    Electronic Resource
    On the Convergence Rate of a Preconditioned Subspace Eigensolver (1999)
    Springer
    Computing 63 (1999), S. 219-231 
    Details
    ISSN: 1436-5057
    Keywords: AMS Subject Classifications:65F15. ; Key words.Eigenvalue problems, convergence rate, Generalized Davidson.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract. In this paper we present a proof of convergence for a preconditioned subspace method which shows the dependency of the convergence rate on the preconditioner used. This convergence rate depends only on the condition of the pre-conditioned system $ \kappa _{2}(MA) $ and the relative separation of the first two eigenvalues $ 1-\lambda _{1}/\lambda _{2} $ . This means that, for example, multigrid preconditioners can be used to find eigenvalues of elliptic PDE's at a grid-independent rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006070050032
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  • 4
    Electronic Resource
    Electronic Resource
    Grains and the galactic electron temperature gradient of Hii regions (1986)
    Springer
    Astrophysics and space science 128 (1986), S. 421-429 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of dust on the electron temperature gradient of galactic Hii regions is investigated taking into account the photoelectric heating mechanism and using a recent galactic rotation curve. It is shown that the grains are unable to contribute substantially to the observed gradient of electron temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644588
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  • 5
    Electronic Resource
    Electronic Resource
    Grains and the heating ofHII regions (1986)
    Springer
    Astrophysics and space science 126 (1986), S. 211-222 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photoelectric heating ofHII regions by solid grains after absorption of both stellar and diffuse photons is considered. The grain heating rate is compared with photoionization gains, and an estimate is made of the final electron temperature for a series of models of nebulae having central stars in different positions on the HR diagram.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00639374
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  • 6
    Electronic Resource
    Electronic Resource
    The Penna model for biological ageing on a lattice: spatial consequences of child-care (1999)
    Springer
    The European physical journal 9 (1999), S. 365-369 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 87.10.+e General theory and mathematical aspects - 07.05.Tp Computer modeling and simulation - 02.70.Lq Monte-Carlo and statistical methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We introduce a square lattice into the Penna bit-string model for biological ageing and study the evolution of the spatial distribution of the population considering different strategies of child-care. Two of the strategies are related to the movements of a whole family on the lattice: in one case the mother cannot move if she has any child younger than a given age, and in the other case if she moves, she brings these young children with her. A stronger condition has also been added to the second case, considering that young children die with a higher probability if their mothers die, this probability decreasing with age. We show that a highly non uniform occupation can be obtained when child-care is considered, even for an uniform initial occupation per site. We also compare the standard survival rate of the model with that obtained when the spacial lattice is considered (without any kind of child-care).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050777
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  • 7
    Electronic Resource
    Electronic Resource
    Lateritic nickel deposits of Brazil (1992)
    Springer
    Mineralium deposita 27 (1992), S. 137-146 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Many nickel deposits are known in Brazil, accounting for about 350 · 106 tons of ore with an average of 1.5% Ni. All are of the lateritic type. These deposits are scattered throughout the country, being rarer in the Northeastern Region and in the South, below 25 °S latitude. They are mainly associated with mafic-ultramafic massifs of large dimensions and ultramafic alkaline complexes, and occur in climatic regions of contrasting seasons. The weathering profile developed over the fresh rock consists, from bottom to top, of the following horizons: altered rock, coarse saprolite, argillaceous saprolite, ferruginous saprolite and lateritic overburden. The thickness of each horizon varies from one deposit to another, the whole profile generally exceeding 20 m. The saprolitic horizons with inherited minerals (serpentine, chlorite) or neoformed minerals (smectites) constitute the silicated nickel ore and are thicker were climatic conditions are drier; the ferruginous upper horizons made up of iron oxide-hydroxides are more developed in more humid regions. In Brazil, the silicated ore generally prevails over the oxidized ore. The main Ni-bearing minerals are serpentine, smectite, garnierite and goethite. The lateritic nickel deposits of Brazil may be correlated with two erosion surfaces, corresponding to the Sul Americano (Lower Tertiary) and Velhas (Upper Tertiary) levelling cycles. The degree of dismantling of the higher and more ancient surface and the consequent development of the Velhas Surface control the position of the nickel accumulation in the landscape. Thus, the deposits may be found either in the lowlands or in the highlands, where they are always covered by a silcrete layer. The alteration profiles in the Brazilian lateritic nickel deposits are broadly similar to those described elsewhere in the world. However, they present two characteristic features: the silicated ore prevails over the oxidized ore, and a silicified layer covers the profies developed on the highlands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197099
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  • 8
    Electronic Resource
    Electronic Resource
    Self-organisation of female menopause in populations with child-care and reproductive risk (1999)
    Springer
    The European physical journal 7 (1999), S. 501-504 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 87.10.+e General, theoretical, and mathematical biophysics (including logic of biosystems, quantum biology, and relevant aspects of thermodynamics, information theory, cybernetics, and bionics) - 02.70.Lq Monte-Carlo and statistical methods - 07.05.Rm Data presentation and visualization: algorithms and implementation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In this paper, by using a computer model for the evolution of age-structured populations, we show that in a sexual population subject to: (i) senescence, (ii) age-increasing reproductive risks, and (iii) long juvenile dependence, menopause arises spontaneously, in order to guarantee the survival of the offspring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050637
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  • 9
    Electronic Resource
    Electronic Resource
    High reproduction rate versus sexual fidelity (1999)
    Springer
    The European physical journal 10 (1999), S. 781-785 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 87.10.+e General theory and mathematical aspects - 07.05.Tp Computer modeling and simulation - 02.70.Lq Monte-Carlo and statistical methods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We introduce fidelity into the bit-string Penna model for biological ageing and study the advantage of this fidelity when it produces a higher survival probability of the offspring due to paternal care. We attribute a lower reproduction rate to the faithful males but a higher death probability to the offspring of non-faithful males that abandon the pups to mate other females. The fidelity state of the father is transmitted to the male offspring (with or without error). We show that nature may prefer a lower reproduction rate to warrant the survival of the offspring already born.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050908
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  • 10
    Electronic Resource
    Electronic Resource
    Policy issues in agroforestry: technology adoption and regional integration in the western Brazilian Amazon (1997)
    Springer
    Agroforestry systems 38 (1997), S. 195-222 
    Details
    ISSN: 1572-9680
    Keywords: agricultural development ; livestock ; socioeconomic characteristics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Agroforestry systems (AFS) have received much attention from policymakers and others for their perceived ability to contribute significantly to economic growth, poverty alleviation, and environmental sustainability. Yet in many areas of the developing world where AFS have proven their agronomic potential, they have yet to be widely adopted. This paper approaches the issue with a focus on one such area – the western Brazilian Amazon, an area where economic integration within the region itself, across national boundaries, and between the region and the rest of Brazil (’regional integration‘) may soon vastly shift incentives to natural resource users. The paper addresses AFS adoption via a conceptual framework that argues for scrutinizing agronomic and socioeconomic characteristics of AFS and their potential adopters. This framework facilitates a priori assessment of whether specific AFS will be adopted, and if so, by whom and with what likely impact on the development objectives at hand. It highlights characteristics that lend socioeconomic and agronomic ’agility‘ – connoting flexibility to easily shift production systems and accompanying marketing strategies in response to unforeseen or rapid change (due to qualities of the AFS itself, or the producer). Financial performance indicators (net present value of AFS during establishment and for the life of a project, and years to positive cash flow) are presented for selected AFS, and juxtaposed to a livestock production system that is already gaining wide adoption in the area. This juxtaposition illustrates the practical effects of socio-economic and agronomic characteristics posited as influential. Against this backdrop, trends in ’regional integration' are discussed, along with implications this integration process has for AFS adoption. The paper ends with a discussion of the roles and limitations of policy in promoting AFS adoption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005921917359
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