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  • Springer  (29)
  • Oxford University Press  (3)
  • American Chemical Society (ACS)
  • PANGAEA
  • Springer Nature
  • 1990-1994  (32)
  • 1
    Electronic Resource
    Electronic Resource
    Heuristics for rapidly four-coloring large planar graphs (1991)
    Springer
    Algorithmica 6 (1991), S. 869-891 
    Details
    ISSN: 1432-0541
    Keywords: Four coloring ; Planar graphs ; Kempe chaining ; Saturation algorithm of Brélaz ; Heuristic algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We present several algorithms for rapidly four-coloring large planar graphs and discuss the results of extensive experimentation with over 140 graphs from two distinct classes of randomly generated instances having up to 128,000 vertices. Although the algorithms can potentially require exponential time, the observed running times of our more sophisticated algorithms are linear in the number of vertices over the range of sizes tested. The use of Kempe chaining and backtracking together with a fast heuristic which usually, but not always, resolves impasses gives us hybrid algorithms that: (1) successfully four-color all our test graphs, and (2) in practice run, on average, only twice as slow as the well-known, nonexact, simple to code, Θ(n) saturation algorithm of Brélaz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01759077
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  • 2
    Electronic Resource
    Electronic Resource
    Particle evaporation from hot nuclei withA ≦85 mainly prior to scission (1992)
    Springer
    The European physical journal 344 (1992), S. 259-267 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Gh ; 25.70.Jj ; 25.85.Ge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on measurements of fusion-fission fragments and evaporation residues from the reaction58Ni +27Al at 835 MeV incident energy leading to compound nucleiA ≦ 85 with high excitation energies. In the case of fission the mass dependence of the velocity widths of separated fragments indicate that the evaporation of light particles predominantly occurs from the composite nucleus prior to scission. The fraction evaporated from the fully separated fragments after scission can be estimated to approximately 20%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303019
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  • 3
    Electronic Resource
    Electronic Resource
    Spin-glass antiphase in high-T c superconductors (1990)
    Springer
    The European physical journal 80 (1990), S. 7-13 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Numerical simulations were carried out for the Aharony model of the insulating phase in high-T c superconductors. The Aharony model is found to give an adequate description for low doping. The model and its relation to superconductivity are discussed. In particular, the question of a magnetic gap in the larger doping regime corresponding to the superconducting phase is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390647
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  • 4
    Electronic Resource
    Electronic Resource
    Local anharmonic vibrations strong correlations and superconductivity: A quantum simulation study (1990)
    Springer
    The European physical journal 81 (1990), S. 327-335 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the importance of local anharmonic vibrations of the bridging oxygen in the copper oxide high-T c materials in the context of superconductivity. For the numerical simulation we employ the projector quantum Monte Carlo method to study the ground state properties of the coupled electron-phonon system. The quantum Monte Carlo simulation allows an accurate treatment of electronic interactions which investigates the influence of strong correlations on superconductivity mediated by additional quantum degrees of freedom. As a generic model for such a system, we study the two-dimensional single band Hubbard model coupled to local pseudo spins (bridging oxygen), which mediate an effective attractive electron-electron interaction leading to superconductivity. The results are compared to those of an effective negativeU model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390812
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  • 5
    Electronic Resource
    Electronic Resource
    High-temperature superconductivity in the apex-oxygen model: a quantum Monte Carlo study (1991)
    Springer
    The European physical journal 82 (1991), S. 339-345 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Projector Quantum Monte Carlo Method is applied to examine the existence of superconductivity in the Apex-Oxygen-Model which describes the physics of the correlated carriers in the CuO2-planes coupled to the anharmonic vibrations of the apex oxygen in the hightemperature superconductors. The simulations show clear evidence for extendeds-wave superconductivity in the 100 K temperature range for realistic choice of coupling parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01357176
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  • 6
    Electronic Resource
    Electronic Resource
    Limiting excitation energies in fusion evaporation reactions (1993)
    Springer
    The European physical journal 347 (1993), S. 135-143 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Gh ; 25.70.Jj ; 25.70.Mn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mass dependence of the critical excitation energy above which a hot nucleus does not decay any more by particle evaporation, has been studied in the mass range 75≦A≦130. The experimental values of the critical excitation energy have been obtained by means of a new integral method based on the analysis of the widths of the evaporation residue mass distributions as a function of the residue velocity. The obtained mass dependence appears to be stronger than expected by various models and a predicted dependence on theZ/A ratio of the decaying nucleus seems to be confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284680
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  • 7
    Electronic Resource
    Electronic Resource
    Neutralization of H-like ions at a W-surface: via auger cascades? (1991)
    Springer
    The European physical journal 21 (1991), S. S351 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the electron spectra for 07+ on a polycrystalline tungsten surface at collision energies between 100 eV and 100 keV. We find clearly resolved structures from projectile KLL-and LMM Auger electrons. The relative intensities of these peaks show that then=2 level is partly populated by ‘side-feeding’ processes. The time dependence of the KLL peak and the LMM peak can be described by a single exponential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426351
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  • 8
    Electronic Resource
    Electronic Resource
    Cellulosome-like entities inBacteroides cellulosolvens (1991)
    Springer
    Current microbiology 22 (1991), S. 27-33 
    Details
    ISSN: 1432-0991
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Cellulosome-like complexes were identified in the broth and sonic extracts of cellobiose-and cellulose-grown cells ofBacteroides cellulosolvens. The extracellular fractions contained three to four major polypeptides and several minor polypeptide bands that were localized in two major gel filtration peaks indicating average molecular weights of about 700 kDa and 〉10 MDa. A relatively large molecular weight component (Mr 230 kDa) was found to contain carbohydrate, but no apparent enzymatic activity of its own could be detected. The cell sonicate displayed a more complicated polypeptide profile, and glycosylated polypeptides were larger (ca. 310 and 290 kDa) than that of the extracellular fraction. The 230-kDa extracellular component interacted strongly with the GSI isolectin fromGriffonia simplicifolia, exhibited immunochemical cross-reactivity with the S1 subunit of the cellulosome fromClostridium thermocellum, and displayed anomalous pH- and salt-dependent migratory behavior in SDS-PAGE. Taken together, this evidence strongly suggests a structural similarity between the glycoconjugates of these two distinct cellulolytic bacteria. A major 84-kDa polypeptide was identified as a xylanase, and a 50-kDa polypeptide displayed endoglucanase activity. Additional biochemical and cytochemical evidence indicated that cellulosome-like cellulolytic complexes are associated with the cell surface in this bacterium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02106209
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  • 9
    Electronic Resource
    Electronic Resource
    He2+-H collisions: experimental charge exchange cross sections and their relevance for alpha particle diagnostics at JET (1991)
    Springer
    The European physical journal 21 (1991), S. S163 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have determined absolute cross sections for electron capture into the quasi-degenerate4l states of He+ produced in collisions of He2+ on atomic hydrogen. The cross sections have been deduced by deconvoluting spatial HeII(n =4 →n=3) emission profiles. The measurements have been perfored in the impact energy range of 2−130 keV/amu. The results are compared with theory. In addition we discuss the relevance of these cross sections to α-particle diagnostics in fusion plasmas. At the JET tokamak the HeII(n=4 →n=3) emission can be used to determine related quantities like ion temperature, plasma rotation and local α-particle densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426275
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  • 10
    Electronic Resource
    Electronic Resource
    Core-changing versus core-conserving charge transfer in Ne6+-He collisions (1991)
    Springer
    The European physical journal 21 (1991), S. S255 
    Details
    ISSN: 1434-6079
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured VUV spectra of photons emitted by Ne5+* ions subsequent to single-electron capture in Ne6+- He collisions at impact energies of 1.2 and 0.11 keV/amu. Capture into the NeVI (1s 22s 23d) state has been identified as the dominant reaction channel at both energies. At 0.11 keV/amu capture into core-excited singlet states contributes 35% to the total cross section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426312
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