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  • Articles  (59)
  • Springer  (59)
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  • Articles  (59)
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  • 1
    Electronic Resource
    Electronic Resource
    Inheritance and polymorphism in real-time monitoring and control systems (2000)
    Springer
    Journal of intelligent manufacturing 11 (2000), S. 285-294 
    Details
    ISSN: 1572-8145
    Keywords: SCADA ; HOOD ; real-time monitoring and control ; control C++ ; inheritance ; polymorphism.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Most recent researches into an object oriented design approach for the development of real-time Supervisory Control and Data Acquisition (SCADA) applications have concentrated on object identification and object classification. These techniques, however, may only be considered as an object-based paradigm. In the true object-oriented paradigm, object characteristics such as data encapsulation, inheritance and polymorphism must also be considered. This paper introduces a design paradigm for developing a SCADA system through the true object oriented design methodology. To complete the design, a hierarchical object-oriented design (HOOD) tree is used to map the physical shop floor layout to a logical layout for formulating the basic object hierarchy. The active components and control logic in the SCADA models are manipulated by a newly derived script language called CONTROL-C++ proposed by the author. To verify the proposed model, a newly designed software system is implemented and justified in terms of system completeness and soundness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008927520325
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  • 2
    Electronic Resource
    Electronic Resource
    Planetary accretions in jet streams (1974)
    Springer
    Astrophysics and space science 31 (1974), S. 57-79 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The problem of planetary accretion in a jet stream is studied using the model developed by Alfvén and Arrhenius. We find that there are basically three types of planetary accretion: namely, fast process τ c 〈 τ i , slow process τ c ~ τ i and delayed process τ c 〉 τ i where τ c is the characteristic time of the occurrence of catastrophic accretion and τ i the time-scale of mass injection to the planetary system (≃3×108 yr). These different time scales of accretion are found to be closely related to the primordial thermal profiles and equatorial inclinations of the planets. Finally, Venus' retrograde rotational spin is shown to be a possible result of accretion process in a jet stream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642602
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  • 3
    Electronic Resource
    Electronic Resource
    Neutral atmospheres of comets: A distributed source model (1974)
    Springer
    Astrophysics and space science 26 (1974), S. 153-166 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is argued that the typical nuclear region of a comet, under a variety of circumstances, consists of a central icy nucleus surrounded by an extended icy halo of grains forming a supplementary source for the observed atmospheric constituents. A complete hydrodynamic description of a neutral atmosphere corresponding to such a distributed source model when the predominant ‘parent-molecule’ is H2O is given, and numerical results corresponding to two different velocity distributions of the icy halo consistent with smaller and larger grains are computed. The applicability and relevance of these models are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642630
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamical study of the Hilda asteroids (1976)
    Springer
    Astrophysics and space science 44 (1976), S. 373-383 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Schubart's model of a planar, elliptic restricted three-body problem is used to study the orbital motion of the Hilda asteroids from thePalomar-Leiden Survey. The 3:2 resonant coupling to Jupiter of some of these small asteroids are found to be stable. However, some of the small asteroids with absolute magnitudeg〉15 have large amplitude of variation in their orbital elements in one libration period. Since the lifetime scales against catastrophic collision of the Hilda asteroids are estimated to be several times larger than those of the main belt objects, a significant portion of these resonant asteroids could be the original members of the Hilda group. From this point of view, it is suggested that such ‘size-dependence’ of resonant orbital motions might be the result of the cosmogonic effects ofjet stream accretion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642524
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  • 5
    Electronic Resource
    Electronic Resource
    A note on the cosmogony of the asteroidal belt (1976)
    Springer
    Astrophysics and space science 45 (1976), S. 235-241 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Several arguments based on the orbital dynamics of the asteroids are used to support the idea that the original solar nebula might not necessarily be the Laplacian type of thin disk-like structure. The orbital distribution of the large asteroids is suggested to be a direct result of their accretions of condensed grains in eccentric orbits via the jet stream process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642157
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  • 6
    Electronic Resource
    Electronic Resource
    Some speculations about the origin of the high speed HCN jets in Comet Kohoutek (1973f) (1977)
    Springer
    Astrophysics and space science 46 (1977), S. 109-114 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The origin of the high speed HCN jets observed in Comet Kohoutek (1973f) is considered. It is argued that the occurrence of these jets with Doppler shifts corresponding to velocities of ≈3–5 km s−1 with respect to the nucleus cannot be explained in terms of either (a) explosive outbursts of trapped sub-surface volatiles, (b) highly exothermic chemical reactions involving free radicals [or a combination of (a) and (b)] or (c) the outward expansion of the cometary atmosphere with additional heating. Instead, acceleration of the precursor ions of HCN by energetic electrons in the ionospheric current sheets or current arcs is suggested to play an important role. Also, a fraction of the HCN observed by electric discharges, associated with the ionosphere current system through the cometary atmosphere. It is not possible to make a realistic estimate of this fraction at the present time, but that it may be significant cannot be entirely excluded by the existing observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643757
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  • 7
    Electronic Resource
    Electronic Resource
    Cosmic Rays and Clusters of Galaxies (1998)
    Springer
    Astrophysics and space science 264 (1998), S. 437-442 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The presence of a significant population of relic relativistic electrons - created at an early epoch of the Universe - has been invoked to explain the diffuse EUV emission excess observed in a number of galaxy clusters. While the postulated inverse Compton scattering of the 3° K background radiation by cosmic ray electrons might indeed be utilized as an important diagnostic tool for the physical nature of the intracluster cosmic rays, it is shown here that continuous generation plus reacceleration would be necessary if the conditions on the observed energy spectral distribution and energy supply rate are to be met in the case of clusters with large radio halos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002477501056
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  • 8
    Electronic Resource
    Electronic Resource
    On the effects of accretion and fragmentation in interplanetary matter streams (1974)
    Springer
    Astrophysics and space science 30 (1974), S. 233-241 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The time evolution of interplanetary matter streams is studied using simple mathematical models, taking into account the effects of accretion and fragmentation. While the characteristic behaviour is determined essentiall by Λ0, the initial ratio of the accretion time scale to the internal collision time scale, a focussing following an initial expansion is generally observed. The relevance of the results to cosmogenic ‘Jet-Streams’ as well as present day meteor streams is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645767
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  • 9
    Electronic Resource
    Electronic Resource
    Electrodynamics of the EUV/X-ray bright point and filamentary flux loop complexes (1988)
    Springer
    Astrophysics and space science 144 (1988), S. 347-352 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electrodynamic model of generation of electric currents in the solar atmosphere, by means of twisting of emerging magnetic flux loops, is investigated with emphasis on the small-scaled EUV/X-ray bright points. It is found that the corresponding power input from such conversion of kinetic energy of the turbulent photospheric plasma into magnetic energy could amount to about 25% of the total energy flux of the solar wind and solar radiation. However, if similar filamentary structures containing colder material are formed in abundance, the total energy budget would be correspondingly larger and the resulting mass injection phenomena may be related to the so-called coronal bullets observed in UV. These energetic features suggest that the coronal dynamics and heating could be dictated by plasma structures with angular sizes 〈0.1″–1″. The Solar and Heliospheric Observatory (SOHO) mission will be essential in addressing these issues basic to solar corona and solar wind acceleration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00793191
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  • 10
    Electronic Resource
    Electronic Resource
    On the asteroidal conductivities as inferred from meteorites (1983)
    Springer
    Earth, moon and planets 28 (1983), S. 43-47 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Solar wind interactions with planetary bodies without intrinsic magnetic fields depend to a large extent on the electrical conductivities of the objects in question. If the combined (i.e., ionospheric and interior) electrical conductivities are large, as in the case of Venus, the solar wind interaction is strong due to the generation of a large electrical current flow. It is suggested here that a similar interaction may occur at some asteroids, if their interior conductivity can be approximated by the conductivities of carbonaceous or iron-bearing meteorites. This interaction, in turn, can be used as a tool for remote sensing of the asteroidal interior properties in a spacecraft mission to asteroids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01371671
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