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  • 1
    Electronic Resource
    Electronic Resource
    In situ resistivity measurement of cobalt silicide formation (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2290-2294 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In situ resistivity measurements have been utilized to study the reaction and silicide formation between cobalt and amorphous silicon thin films from room temperature to 800 °C. In conjunction, structure and composition changes were analyzed by x-ray diffraction and Rutherford backscattering spectrometry. Formation of Co2Si, CoSi, and CoSi2 were observed. Interfacial reaction to form Co2Si occurs at approximately 400 °C. In bilayers of excess silicon, CoSi forms at approximately 520 °C and, if free silicon is still present, CoSi2 forms at about 550 °C. In the case of excess cobalt, Co2Si forms first and is followed by a cobalt-rich solid solution. Co3Si silicide was not observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339486
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  • 2
    Electronic Resource
    Electronic Resource
    On Hydrodynamics of Astrophysical Jets (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 470 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb48020.x
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  • 3
    Electronic Resource
    Electronic Resource
    The real value of Mercury's perihelion advance (1986)
    [s.l.] : Nature Publishing Group
    Nature 320 (1986), S. 39-41 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] According to general relativity, the predicted perihelion precession rate (?) is given by2 ? = 6p GM / Pa (1-e2) c2(1) where G is the newtonian gravitational constant, M‚(c) is the mass of the Sun and a, e and P are the semi-major axis, eccentricity and orbital period of Mercury, respectively, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/320039a0
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  • 4
    Electronic Resource
    Electronic Resource
    Long-term changes in the semimajor axes of the outer planets (1986)
    [s.l.] : Nature Publishing Group
    Nature 319 (1986), S. 386-388 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two centuries ago, Lagrange showed that to a first order in the masses of the perturbing planets (in units of the mass of the Sun; Mo= 103 at most, in the case of Jupiter), the semi-major axes are subject only to short periodic changes whose frequencies are linear combinations of the mean motions ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/319386a0
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  • 5
    Electronic Resource
    Electronic Resource
    Facets and lifting procedures for the set covering polytope (1989)
    Springer
    Mathematical programming 45 (1989), S. 111-137 
    Details
    ISSN: 1436-4646
    Keywords: Independence systems ; set covering ; polytope ; facet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract Given a family of subsetsℱ of an arbitrary groundsetE, acover ofℱ is any setC ⊂E having non-empty intersection with every subset inℱ. In this paper we deal with thecovering polytope, i.e., the convex hull of the incidence vectors of all the covers ofℱ. In Section 2 we review all the known properties of the covering polytope. In Sections 3 and 4 we introduce two new classes of non-Boolean facets of such a polytope. In Sections 5 and 6 we describe some non-sequential lifting procedures. In Section 7 a generalization of the notion ofweb introduced by L.E. Trotter is presented together with the facets of the covering polytope produced by such a structure. Moreover, the strong connections between several combinatorial problems and the covering problem are pointed out and, exploiting those connections, some examples are presented of new facets for the Knapsack and Acyclic Subdigraph polytopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01589100
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  • 6
    Electronic Resource
    Electronic Resource
    Synthetic secular theories of the planetary orbits: Regular and chaotic behavior (1988)
    Springer
    Celestial mechanics and dynamical astronomy 45 (1988), S. 293-304 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Modern computer technology allows dynamical astronomers to investigate the long term stability of real systems as thoroughly as ever. However, the process is not straightforward and new problems need to be solved. This work deals with only one such problem: the construction-from the numerical integration- of a secular perturbation theory that is able to describe the dynamical behavior of the system. The discussion refers to the outer planets and is based on the knowledge acquired by the author during her participation in project LONGSTOP. A digital filter is used in order to reduce the output and eliminate short periodic terms. Filtering uncovers long term variations in the semimajor axes. From the filtered output a secular perturbation theory is constructed in the assumption that the solution is regular, as secular perturbation theories can only be constructed for regular solutions. If we succeed, this means that the solution is indeed regular for the computed span of time; if not-and this can be established in a rigorous way-it has to be concluded a posteriori that the solution is not regular. The LONGSTOP 1A and 1B integrations show well that as the timespan of the integration increases it is possible to detect the non-regular behavior of the solution. This happens in the eccentricity of Saturn at the 10−4 level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229013
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  • 7
    Electronic Resource
    Electronic Resource
    Resonant structure of the outer Solar System (1985)
    Springer
    Celestial mechanics and dynamical astronomy 35 (1985), S. 269-287 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Hierarchical stability of the outer Solar System is monitored through its 3-body subsystems by using numerically computed ephemerides for 5×106 yr. It is found that the stability parameters of Sun-Jupiter-Saturn and Sun-Uranus-Neptune oscillate in anti-phase in ∼1.1×106 yr. The mechanism responsible for this locking is a secular resonance between Uranus' perihelion and Jupiter's aphelion: the difference between the two librates within ∼±70° with the same period of ∼1.1×106 yr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01227657
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  • 8
    Electronic Resource
    Electronic Resource
    Instability of the 2+2 body problem (1987)
    Springer
    Celestial mechanics and dynamical astronomy 41 (1987), S. 153-160 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The equations of motion of the 2+2 body problem (two interacting particles in the gravitational field of two much more massive primaries m1 and m2 in circular keplerian orbit) have an integral analogous to the Jacobi integral of the circular 2+1 body problem. We show here that with 2+2 bodies this integral does not give rise to Hill stability, i.e. to confinement for all time in a portion of the configuration space not allowing for some close approaches to occur. This is because all the level manifolds are connected and all exchanges of bodies between the regions surroundingm 1,m 2 and infinity do not contradict the conservation of the integral. However, it is worth stressing that some of these exchanges are physically meaningless, because they involve either unlimited extraction of potential energy from the binary formed by the small bodies (without taking into account their physical size) or significant mutual perturbations between the small masses without close approach, a process requiring, for the Sun-Jupiter-two asteroids system, timescales longer than the age of the Solar System.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01238759
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  • 9
    Electronic Resource
    Electronic Resource
    Anomalous contents of heavy metals in soils and vegetation of a mine area in S.W. Sardinia, Italy (1989)
    Springer
    Water, air & soil pollution 48 (1989), S. 423-433 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Samples of soils and vegetation from the mining area of South-West Sardinia (Italy) were analyzed for Pb, Zn, Cd, and Cu content. The area (more than 100 km2) is inhabited by many thousands of people; land utilization includes mainly grapes on some small plains and permanent sheep pasture on the hills. The levels of Pb, Zn, and Cd were found to be exceptionally high in most samples. Lead concentration was up to 71000 μg g−1 in the soils and 4000 jig g−1 in vegetation; Cd concentration was found up to 665 μg g−1 in soils and 26.5 μg g−1 in vegetation. The heavy metal content of some soil samples was highly variable. Data show that Pb is easily absorbed by plant roots and translocated to foliage. In spite of the high heavy metal level, no signs of toxicity were apparent in vegetation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283340
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  • 10
    Electronic Resource
    Electronic Resource
    Sensitivity of LAGEOS to changes in Earth's (2, 2) gravity coefficients (1986)
    Springer
    Celestial mechanics and dynamical astronomy 39 (1986), S. 1-13 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In recent years it has become of geophysical interest to detect a possible time variation of the low-degree coefficients of the Earth's gravity field, in particular the (2, 2) tesseral harmonic. We investigate the possibility of detecting such a phenomenon via analysis of the tracking data from LAGEOS, the passive geodynamics satellite tracked by laser stations on the ground. For this purpose the main problems are caused: (i) for short orbital arcs, by the irregular distribution in time of the tracking data, and by the dynamical effects of oceanic tides, which cannot be easily separated from the effects of geopotential changes; (ii) for long orbital arcs, by the difficulty of reliably predicting the variable drag-like force that is causing a slow semimajor axis decay. We estimate that a relative accuracy of the order of 10−4 in the (2, 2) coefficients can be reached provided that a larger number of higher technology laser stations is available, and that better modelling is possible of the drag-like force. Both these conditions seem quite unrealistic at present. If a relative accuracy better than 10−4 has to be reached, an effective separation of the tidal perturbations is also needed, since they give rise to perturbations with a similar signature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01232284
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