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  • 1
    Electronic Resource
    Electronic Resource
    Piezoelectric effect and the long-term resistance relaxations induced by uniaxial compression in p-GaAs/AlxGa1−x as heterostructures (2000)
    Springer
    Journal of experimental and theoretical physics 91 (2000), S. 1250-1260 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Long-term resistance relaxations induced by uniaxial compression in (001)p-GaAs/Al0.5Ga0.5 As heterostructures are observed, and the main properties of these relaxations are investigated: the dependence of their character on the direction of the uniaxial compression, the change in concentration of current carriers during the relaxation processes, and the quenching of the relaxations by temperature, illumination, and high electric fields. It is found that the character of the relaxation process is different for compression directions [110] and $$[1\bar 10]$$ : in the first case the concentration of two-dimensional holes in the quantum well decreases in the course of the relaxation, while in the second case it increases. A model is proposed in which the cause of the relaxations of the piezoresistance and the anisotropic character of these relaxations is assumed to be the piezoelectric field, the value of which, according to estimates, is |E z| = 1.152 × 104 V/cm per kbar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1342893
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  • 2
    Electronic Resource
    Electronic Resource
    Duodenaldivertikel – ein ungewöhnliches Erscheinungsbild eines retroperitonealen Liposarkomrezidivs (2000)
    Springer
    Der Chirurg 71 (2000), S. 331-333 
    Details
    ISSN: 1433-0385
    Keywords: Key words: Liposarcoma – Recurrency – Diverticulum of duodenum – Leiomyoma. ; Schlüsselwörter: Liposarkom – Rezidiv – Duodenaldivertikel – Leiomyom.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Die Therapie der Wahl beim retroperitonealen Liposarkom ist die R0-Resektion. Trotzdem zeigt das Liposarkom eine hohe lokale Rezidivrate mit konsekutiven Folgeeingriffen. Anhand unseres Fallberichts soll verdeutlicht werden, daß trotz geeigneter Verlaufsuntersuchungen eine ungewöhnliche Konfiguration in der Rezidiverkennung Schwierigkeiten bereitet. So konnte letztendlich erst in der histopathologischen Aufarbeitung ein monströses Duodenaldivertikel, in dessen Divertikelhals zusätzlich ein Leiomyom lokalisiert war, als Liposarkomrezidiv identifiziert werden.
    Notes: Summary. The treatment of choice in retroperitoneal liposarcoma is curative R0 resection. However, there are high rates of reoperation due to recurrence. Our present case report shows difficulties in detecting recurrence due to atypical configuration. Eventually a huge diverticulum of the duodenum combined with leiomyoma in its neck area was histopathologically identified as a recurrent liposarcoma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001040050055
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  • 3
    Electronic Resource
    Electronic Resource
    Space-time evolution of the hadronic source in peripheral to central Pb+Pb collisions (2000)
    Springer
    The European physical journal 18 (2000), S. 317-325 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Two-particle correlations of negative pions as a function of charged particle multiplicity are studied in Pb+Pb collisions at $\sqrt{s}=17.3$ GeV per nucleon using the NA44 experiment at the CERN Super Proton Synchrotron(SPS). We find that the source size parameters increase with the charged particle multiplicity. However the slope of the source size parameters plotted as a function of charged multiplicity is slightly larger at high multiplicity than at low multiplicity. The value of $\lambda$ is independent of charged multiplicity. For Pb+Pb collisions, $R_L$ is larger than $R_{TS}$ and $R_{TO}$ for all multiplicity intervals, whereas these three radius parameters were approximately equal in S+Nucleus collisions. The ratios ( $R_L/R_{TS}$ ) and ( $R_L/R_{TO}$ ) for Pb+Pb data show almost no dependence on charged multiplicity. The duration of pion emission $\Delta \tau$ is constant at 3.8 $\pm$ 1.1 fm/c as a function of the charged multiplicity in Pb+Pb collisions. Effective volume (V) is also calculated as V= $\pi\times R_{TS}^2\times R_L$ , assuming a cylindrically shaped source. We found, within the limited statistics, the effective volume rapidly increases at high multiplicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520000543
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  • 4
    Electronic Resource
    Electronic Resource
    On the Absorption of antibaryons in nuclei (2000)
    Springer
    The European physical journal 7 (2000), S. 293-298 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 25.75.-q Relativistic heavy-ion collisions – 25.75.Dw Particle and resonance production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Antiproton (¯p) and antilambda (¯Λ) production has been measured for minimum bias in p+A collisions and central A1+ A2 collisions at the CERN-SPS by the collaborations NA35/49 and NA44. The measurements are extrapolated from rapidity distributions to absolute minimum bias cross sections. It is shown that the ¯p cross sections divided by A1· A2 follow an exponential trend as a function of a characteristic length obtained from a Glauber type absorption model, while the ¯Λ cross sections divided by A1· A2 are constant. The exponential trend also holds for ¯p production at the lower energies of the Brookhaven AGS. A discussion of the physics interpretation of the established trends in terms of an effective absorption cross section is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050394
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  • 5
    Electronic Resource
    Electronic Resource
    Deuteron and triton production with high energy sulphur and lead beams (2002)
    Springer
    The European physical journal 23 (2002), S. 237-247 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Proton and deuteron production has been observed in S+S and S+Pb collisions at 200 A $\cdot$ GeV and in Pb+Pb reactions at 158 A $\cdot$ GeV at the CERN SPS accelerator. For Pb+Pb triton production was also measured. The p and d spectra as well as the p and t spectra were observed in similar rapidity ranges and over similar ranges of transverse momenta per nucleon, making it possible to interpret the cross sections of the composite particles in terms of coalescence mechanisms. Volumes of homogeneity were extracted and compared to pion-pair HBT interferometry results. Special attention is given to the dependence on transverse mass, centrality and rapidity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100520100877
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