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  • 25.10.+s  (1)
  • 25.70 Jj  (1)
  • 25.85.−w  (1)
  • adaptive control  (1)
  • 1
    Electronic Resource
    Electronic Resource
    In-beam investigation of ternary fission (1988)
    Springer
    The European physical journal 330 (1988), S. 189-195 
    Details
    ISSN: 1434-601X
    Keywords: 25.85.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear fission accompanied by long-range alpha particles has been investigated. Fission was induced by irradiating a natural uranium target with 13.5 MeV deuterons. The alpha energy and angular distributions are similar to those observed in spontaneous or thermal neutron induced fission. The correlation angle between alpha particles and light fission fragments has a most probable value of $$\bar \vartheta _{l f - \alpha } = 82.1^\circ \pm 0.9^\circ $$ and a dispersion (FWHM) of Δϑ=18.4°±1.2°. The mean value and dispersion of the energy distribution are $$\bar {\rm E}_\alpha = 14.8 \pm 1.0 MeV$$ and ΔE=9.1±1.2 MeV (FWHM), respectively. The peak-to-valley ratio of the ternary fission fragment mass distribution is found to increase with increasing alpha energy. For near-symmetric mass division, a strong broadening of the angular distribution is observed. The results are discussed in the frame of a multichannel-fission model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01293395
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  • 2
    Electronic Resource
    Electronic Resource
    Search for charged-particle emission from deuterated palladium foils (1990)
    Springer
    The European physical journal 336 (1990), S. 1-4 
    Details
    ISSN: 1434-601X
    Keywords: 21.40.+d ; 25.10.+s ; 25.45.−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results are presented from the search for energetic charged particles possibly emitted from a deuterium loaded palladium electrode in an electrolysis cell. Within the sensitivity of our experimental set-up, we could not find events originating from ‘cold nuclear fusion’ processes. Based on this outcome, an upper limit for the non-observation of CNF of 2.0×10−2s−1 emitted charged particles per cm3(Pd) resp. 1.6×10−24s−1 emitted charged particles per D pair has been deduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904156
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  • 3
    Electronic Resource
    Electronic Resource
    Shell effects in the evolution of the mass asymmetry in heavy-ion collisions leading to composite systems withZ=108 (1986)
    Springer
    The European physical journal 325 (1986), S. 335-346 
    Details
    ISSN: 1434-601X
    Keywords: 25.70 Jj ; 25.85 Ge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fragment mass distributions are presented obtained in the heavy-ion reactions22Ne+249Cf,32S+238U,40Ar+232Th and56Fe+208Pb leading to composite systems with equal nuclear charge numberZ=108. The experiments were performed at the heavy-ion cyclotron U 300 of the Laboratory of Nuclear Reactions in Dubna. The spectrometer DEMAS was used to measure the time-of-flight values and the laboratory angles of the correlated fragments. The shape of the mass distributions strongly depends on the initial mass asymmetry. When decreasing the bombarding energy down to values near the Coulomb barrier, the mass distributions obtained in the reactions32S+238U and40Ar+232Th exhibit relative maxima ofM≈205 interpreted to be due to stabilizing effects of nuclear shells during the fragmentation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294618
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  • 4
    Electronic Resource
    Electronic Resource
    Autonomy capabilities of European deep space probes (1996)
    Springer
    Autonomous robots 3 (1996), S. 19-30 
    Details
    ISSN: 1573-7527
    Keywords: space vehicles ; autonomy ; attitude control ; descent control ; adaptive control ; computer simulation ; remote control ; robots
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The European Space Agency ESA is currently preparing the two deep space missions, Huygens and Rosetta. This paper reviews the related requirements for autonomous operations in a poorly known environment. While for Huygens emphasis is on the control of the descent through Titan's atmosphere, for Rosetta the safe drilling of material samples in the microgravity environment of a comet is analysed. The control concepts to enable adaptive reactions in an uncertain, remote environment are summarized for the crucial mission phases. The performance results obtained from computer simulations are presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162465
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