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  • Articles: DFG German National Licenses  (11)
  • 2000-2004  (2)
  • 1985-1989  (7)
  • 1970-1974  (1)
  • 1905-1909  (1)
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  • Articles: DFG German National Licenses  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Differential cross-section of high-mass muon pairs produced by a 194 GeV/c π− beam on a tungsten target (1985)
    Springer
    The European physical journal 28 (1985), S. 9-14 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a measurement of the production of muon pairs in 194 GeV/c π−-tungsten interactions. A sample of 155,000 events with mass higher than 4.07 GeV/c2 has been used to determine the differential cross-section as a function of the scaling variables $$\sqrt \tau $$ andx F .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550243
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Observation of anomalous scaling violation in muon pair production by 194 GeV/c π−-tungsten interactions (1985)
    Springer
    The European physical journal 28 (1985), S. 15-22 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The differential cross-section for dimuon production by 194 GeV/c π− onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thex F and $$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550244
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Symplectic topology and Hamiltonian dynamics (1989)
    Springer
    Mathematische Zeitschrift 200 (1989), S. 355-378 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01215653
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental study of bone-implant contact with a parabolic acetabular component (Hofer-Imhof) (2000)
    Springer
    Archives of orthopaedic and trauma surgery 120 (2000), S. 160-165 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Incomplete bone contact with threaded acetabular components is usually attributable to the tapered thread design and sclerotic bone, and might be the reason for early loosening. The self-tapping flat threads of the Hofer-Imhof cup allow accurate insertion without incarceration, even in sclerotic bone. To demonstrate the effectiveness of this threaded cup design based on digitized measurements of bone contact area, six Hofer-Imhof cups were implanted into three human cadavers. The bone contact area at the threads was digitally analyzed on cadaver-explanted cups cut into horizontal and coronal sections. In cups fixed with ideal form fit, bone contact was 31.6% (range 8–55%) at the threads and 28.5% (range 0–49%) between the threads on average. In cups with incomplete bone contact secondary to insufficient reaming, the bone contact area averaged 27.4% (range 10–44%) at the threads. In sclerotic bone, the highest bone contact at the threads was 69%. The threads were the first part of the cup to achieve primary bone contact. Factors contributing to poor contact were incomplete reaming, sections which passed through the incisura of the acetabulum, and incomplete contact with the medial aspect of the acetabulum. The aim was to achieve complete bone contact. Because of the higher contact areas observed in sclerotic bone, some sclerotic bone should remain after reaming.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004020050035
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Convex Hamiltonian energy surfaces and their periodic trajectories (1987)
    Springer
    Communications in mathematical physics 113 (1987), S. 419-469 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract In this paper we introduce symplectic invariants for convex Hamiltonian energy surfaces and their periodic trajectories and show that these quentities satisfy several nontrivial relations. In particular we show that they can be used to prove multiplicity results for the number of periodic trajectories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01221255
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Periodic solutions with prescribed minimal period for convex autonomous hamiltonian systems (1985)
    Springer
    Inventiones mathematicae 81 (1985), S. 155-188 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Clarke has shown that the problem of findingT-periodic solutions for a convex Hamiltonian system is equivalent to the problem of finding critical points to a certain functional, dual to the classical action functional. In this paper, we relate the Morse index of the critical point to the minimal period of the correspondingT-periodic solution. In particular, we show that if the critical point is obtained by the Ambrosetti-Rabinowitz mountain-pass theorem the corresponding solution has minimal periodT, that is, it cannot beT/k-periodic withk integer,k≧2. As a consequence, we prove that if the Hamiltonian is flat near an equilibrium and superquadratic near infinity, then for anyT〉0, the corresponding Hamiltonian system has a periodic solution with minimal periodT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388776
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Periodic solutions on hypersurfaces and a result by C. Viterbo (1987)
    Springer
    Inventiones mathematicae 90 (1987), S. 1-9 
    Details
    ISSN: 1432-1297
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01389030
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Blood vessels surrounded by connective tissue (perivascular space) in the brain of Lepidosteus (Ganoidei) and some teleost fishes (1974)
    Springer
    Cell & tissue research 153 (1974), S. 435-448 
    Details
    ISSN: 1432-0878
    Keywords: Brain vessels ; Perivascular space ; Connective tissue ; Blood-brain-barrier ; Lepidosteus (Ganoidei) ; Teleosts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Blood vessels surrounded by unusually wide perivascular spaces rich in connective tissue were observed in the brain of Lepidosteus (Ganoidei). Connective-tissue sheaths measuring up to 13 μm in width enclose arterioles and venules (40–70 μm in diameter), and even capillaries may be encompassed by a cuff formed by collagen fibers. Blood vessels with wide perivascular spaces are mainly located in the subependymal layer of the lateral ventricles, near the mesencephalic aqueduct and in the folded basal lining of the fourth ventricle. At the light-microscopic level these vessels do not show any distinct contact with nervous elements (axons). Some other brain regions of Lepidosteus, e.g. mesencephalic tectum, are supplied by a conventional type of capillaries, free of connective-tissue linings. For comparative reasons, brains of several selachian and teleostean species were examined with comparable histological methods. Distinct perivascular spaces were found in the pike, in the trout and in the eel. They are considerably richer in connective tissue than the occasionally observed narrow perivascular spaces in the shark. The significance of the abundant perivascular connective tissue in the brain of Lepidosteus is open to discussion; structural and functional problems of the brain-blood-barrier have been reviewed in this context. The brain of Lepidosteus appears to be a very suitable model for studies of blood supply, vascular ultrastructure and blood-brain-barrier functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231539
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Angular distributions of muon pairs produced by 194 GeV/c negative pions (1986)
    Springer
    The European physical journal 31 (1986), S. 513-526 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the angular distributions of muon pairs obtained in a high-statistics experiment using a 194-GeV/c π- impinging on a tungsten target. Our results are based on the analysis of 145,000 events with positive Feynmanx and mass above 4.07 GeV/c2, excluding the ϒ region. Simple first-order QCD relations allow us to determine the ratio of annihilation with hard-gluon emission to the sum of annihilation with hard-gluon emission and hard-gluon Compton scattering, which is found to be about 58% to 75%. We determine the parton square intrinsic transverse momenta to be of the order of 0.6 (GeV/c)2, and about 30% larger in the pion than in the nucleon. At largex 1, our data agree with the higher-twist hypothesis, and support the interpretation of the relevant scale parameter as the dimuon square transverse momentum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01551072
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Roost-mate communication in adult Indian false vampire bats (Megaderma lyra): an indication of individuality in temporal and spectral pattern (2000)
    Springer
    Animal cognition 3 (2000), S. 99-106 
    Details
    ISSN: 1435-9456
    Keywords: Key words Communication ; Individual signature ; Recognition ; Social behaviour ; Bats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The remarkable cognitive abilities of bats indicate that they may recognise particular conspecifics. Because of their highly developed auditory system, it is obvious that vocalisations of bats may give information about the individual emitting them. In a field study of the social behaviour in the Indian false vampire bat (Megaderma lyra), two different types of vocalisation were recorded and analysed. The bats emitted these vocalisations only while aggregating with conspecifics inside the day roost. The “landing strophe” consisted of a number of brief multiharmonic downward frequency-modulated (FMdown) sounds which levelled off as a constant frequency (CF), and the “clatter strophe” was composed of a number of multiharmonic FMdown sounds which became shallow at the end as a short CF. The sounds of the landing strophe and the ¶clatter strophe differed in repetition rate, duration, harmonic components and frequency. Time pattern and peak frequency of the two sound types differed highly significantly between single, unidentified bats. The sounds were inter-individually distinct when the three parameters were combined as an acoustical space. Therefore, these vocalisations might be used for individual recognition in adult bats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100710000067
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    Paper (German National Licenses)
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