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  • Springer  (166)
  • Oxford University Press  (78)
  • American Association for the Advancement of Science  (34)
  • 1985-1989  (111)
  • 1975-1979  (81)
  • 1970-1974  (80)
  • 1950-1954  (6)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Distribution of end-points of a branching network with decaying branch length (1976)
    Springer
    Bulletin of mathematical biology 38 (1976), S. 219-237 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The geometry of the human bronchial tree has been described as a network formed by successive dichotomous branching with constant branching angles and geometrically decaying branch lengths. Models having these properties and with randomly distributed branching planes are constructed. The distribution of the end points of the model networks are described by computing the variance of the distributions in the direction of the axis of the network and in the transverse directions. It is found that, for a given decay ratio, there is a branching angle for which the volume filled by the end points is a maximum. The advantages of the network with the decay ratio and branching angle of the human bronchial tree are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459556
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  • 2
    Electronic Resource
    Electronic Resource
    Parametric up-conversion from the infra-red (1971)
    Springer
    Optical and quantum electronics 3 (1971), S. 37-48 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The subject of up-conversion in optically nonlinear crystals is reviewed. The characteristic properties of the detection of IR signals and images by frequency conversion to the visible and subsequent detection by a photocathode device are described. The way in which phase-matching normally restricts the spectral bandwidth to a few wavenumbers and the field of view to a few degrees is discussed. The conditions for achieving maximum image resolution are identified. Signal up-conversion should find application in the detection of weak IR radiation in astronomy and spectroscopy. Image up-conversion provides a novel “direct” method of viewing IR images. The ultimate temperature resolution when viewing a room temperature thermal scene is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01423512
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  • 3
    Electronic Resource
    Electronic Resource
    Rapid oscillations in cataclysmic variables (1986)
    Springer
    Astrophysics and space science 118 (1986), S. 271-277 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Rapid coherent and quasi-periodic oscillations in the optical and X-ray fluxes of cataclysmic variable stars are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651134
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  • 4
    Electronic Resource
    Electronic Resource
    Two visual observations of relevance to the search for optical counterparts of gamma-ray sources (1986)
    Springer
    Astrophysics and space science 122 (1986), S. 397-400 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We draw attention to a visual observation of a brief flash from ζ Lyrae, observed by Heis in 1850, which resembles the optical burst detected electronically by Wdowiak and Clifton (1985) from β Cam in 1969. Visual observation by the author of a second magnitude flash of very short duration is shown to originate from planar reflection from a very distant satellite. Such flashes will contribute to the ‘noise’ in all-sky searches for optical counterparts of γ-ray bursters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650205
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  • 5
    Electronic Resource
    Electronic Resource
    BV centauri: dwarf or classical nova? (1986)
    Springer
    Astrophysics and space science 122 (1986), S. 73-80 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The similarity in properties of GK Per and BV Cen suggests that the latter may be a classical nova remnant rather than a dwarf nova. Our Hα and V CCD photometry show no sign of a nova shell but disclose the presence of a close and probably physical companion. BV(RI) c CCD photometry of the companion, assumed to be a dwarf, givesM v =3.1±0.3 for BV Cen at quiescence. Even though half of the light in BV Cen comes from the secondary this is much brighter than expected for a dwarf nova and supports the conclusion that BV Cen was an unrecorded nova.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654382
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  • 6
    Electronic Resource
    Electronic Resource
    A shortest path algorithm in robotics and its implementation on the FPS T-20 hypercube (1988)
    Springer
    Annals of operations research 14 (1988), S. 305-320 
    Details
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract A broad class of problems involving the optimal control of robot arms can be formulated as dynamic programming problems whose structure is particularly attractive for parallel processing. For certain simple cost functions the dynamic programming formulation reduces to determining the shortest path through a network. This algorithm has been implemented on a Floating Point Systems' T-20 hypercube computer. An analysis of the performance of the algorithm provides several important insights into the interplay between problem size and the number of processors in a parallel computer. The results also underscore the potential for parallel computers in real-time control applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02186485
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  • 7
    Electronic Resource
    Electronic Resource
    Systematics of Dwarf Novae (1987)
    Springer
    Astrophysics and space science 130 (1987), S. 3-13 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From about 30 Dwarf Novae with the best determined distances the following relationships are found. (i) a tight correlation between absolute magnitude at maximum light, Mv(max), and orbital period, P. (ii) a correlation between Mv(min) and P showing wide scatter. (iii) a correlation between Mv(mean), the mean absolute magnitude averaged over normal outbursts, and P, again with wide scatter. The scatter is shown to correlate strongly with ouburst timescale Tn. (iv) a strong correlation between range, Mv(min)-Mv(max), and Tn (the Kukarkin-Parenago relationship). (v) a strong correlation between range Mv(mean)-Mv(max), and both Tn and P. This final correlation is interpreted in terms of the disc instability model of dwarf novae and successfully predicts the observed width of outburst versus P relationship.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654967
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  • 8
    Electronic Resource
    Electronic Resource
    Uy phoenicis: RR lyrae variable, not dwarf nova (1986)
    Springer
    Astrophysics and space science 124 (1986), S. 199-201 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photometric and spectroscopic observations of UY Phe, previously classified as a dwarf nova, show it to be a typea RR Lyr halo variable with a period of 0.5118 day.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649760
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  • 9
    Electronic Resource
    Electronic Resource
    The May 1985 superoutburst of OY Carinae: I. Structure of the outer disk from optical and IR observations (1987)
    Springer
    Astrophysics and space science 130 (1987), S. 365-369 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present optical and IR observations of the dwarf nova OY Car during the May 1985 superoutburst. From them we find that the superhump has a temperature of ∼8000K and an area of order half the size of the red dwarf or accretion disk. We also compare the behaviour during two simultaneous optical/IR observations. Whilst the light curves in the two pass bands are similar during one observation, in the other observation they show marked differences that may be due to a cool region in the outer disk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655018
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  • 10
    Electronic Resource
    Electronic Resource
    Fibrations of spheres by parallel great spheres and Berger's rigidity theorem (1987)
    Springer
    Annals of global analysis and geometry 5 (1987), S. 53-82 
    Details
    ISSN: 1572-9060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00140754
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