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  • 1
    Electronic Resource
    Electronic Resource
    Physical factors influencing refraction of the echolocative sound beam in delphinid cetaceans (1979)
    Springer
    Marine biology 52 (1979), S. 285-290 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The delphinid melon has been postulated to function as a “sound lens” in which lipids refract and collimate the ultrasonic beam used for echolocation. To identify the major physical factors influencing sound-beam refraction, lipid samples from the 4 regions of the Tursiops truncatus melon were examined for variation of sound velocity with temperature. These results were then combined with available sound velocity data for Tursiops sp. melon tissue, Globicephala melaena melon lipids, G. melaena melon tissue, and seawater to model the total melon/seawater system encountered by the projected sound beam in both delphinids. Our analysis suggests that much of the refractive collimation occurs at the tissue/seawater interface rather than in the main body of the delphinid melon. Abrupt changes in the temperature and sound velocity at or near this convex interface (the forehead) cause this refraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00398142
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetoacoustics in low dimensional spin systems in pulsed magnetic fields (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7055-7057 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present results on sound wave propagation in pulsed fields up to 50 T for CsCuCl3 and (VO)2P2O7. Sound velocity and attenuation exhibit anomalies at the field induced spin transitions at low temperatures. In CsCuCl3 we observe step-like anomalies in sound velocity and pronounced peaks in attenuation at the saturation field (34 T at 1.5 K) and broader anomalies at the commensurate-incommensurate transition (14–17 T). In (VO)2P2O7 we observe a strong anomaly at the critical field when the lowest triplet branch crosses the singlet ground state (27 T at 1.6 K). All these experiments give important information on the spin state in high magnetic fields of these low dimensional spin systems and on the spin-phonon coupling. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372929
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  • 3
    Electronic Resource
    Electronic Resource
    Biomechanisches Verhalten der Wirbelsäule-Segmente (1977)
    Springer
    Archives of orthopaedic and trauma surgery 87 (1977), S. 111-116 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wird eine Methode zur Beurteilung der biomechanischen Gegebenheiten eines Wirbelsäulen-Segmentes vorgeschlagen. Diese verlangt eine besondere Art der Röntgenuntersuchung. Die Methode stützt sich auf die Konstruktion von Momentanpolen, die die momentanen Drehpunkte eines Wirbelsegmentes darstellen. Diese Drehpunktorte wurden für zwei genau definierte Körperhaltungen mittels einer Statistik von 60 Segmenten erfaßt. Diese Methode dient diagnostisch zur Unterscheidung von normaler zu pathologischer Funktion der Segmente und zur Beurteilung von Behandlungsergebnissen.
    Notes: Summary The authors propose a new model to estimate the forces of the intrinsic equilibrium of the segment. Based on the theory of the so-called transient pole, it became possible to describe the momentary movement of an angle relative to its neighbour and to define the way of the intrinsic equilibrium. This transient pole fixes the centre of rotation around which the upper angle moves relative to the lower vertebral body. Normal and pathological cases can be diagnosed at once by use of a special röntgenological appliance in connection with the statistical experience. It becomes possible to calculate the forces and movements acting on a segment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00416144
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of the low dimensional spin system (VO) P O :ESR and susceptibility (1998)
    Springer
    The European physical journal 5 (1998), S. 313-316 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.10.Jm Quantized spin models - 76.30.-v Electron paramagnetic resonance and relaxation - 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Experimental results on magnetic resonance (ESR) and magnetic susceptibility are given for single crystalline (VO)2P2O7. The crystal growth procedure is briefly discussed. The susceptibility is interpreted numerically using a model with alternating spin chains. We determine J =51 K and . Furthermore we find a spin gap of meV from our ESR measurements. Using elastic constants no indication of a phase transition forcing the dimerization is seen below 300 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050448
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  • 5
    Electronic Resource
    Electronic Resource
    Crystal field effect in the thermal expansion of cubic rare earth compounds (1977)
    Springer
    The European physical journal 28 (1977), S. 141-147 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on evidence of crystal-electric-field effects in the low temperature thermal expansion of various rocksalt-type rare earth compounds (PrSb, SmSb, ErSb, TmSb, CeTe, TmTe). From our measurements we deduce the volume dependence of the energy splitting between the lowest crystal field levels and we calculate magnetoelastic coupling parameters involving the volume strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313036
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  • 6
    Electronic Resource
    Electronic Resource
    Grüneisen parameter coupling in heavy fermion systems (1986)
    Springer
    The European physical journal 64 (1986), S. 169-174 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss thermodynamic consequences of a Grüneisenparameter electron-phonon coupling in heavy fermion systems. Characteristic features of sound propagation, thermal expansion and ultrasonic attenuation are given. Model calculations for UPt3 are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303699
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  • 7
    Electronic Resource
    Electronic Resource
    Electron-phonon interaction in LaAg (1987)
    Springer
    The European physical journal 68 (1987), S. 291-298 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetoacoustic de Haas-van Alphen data on LaAg are compared with a new relativistic band structure calculation including La-4f states. We find convincing agreement of the measured and calculated dHvA frequencies. The deformation of the Fermi surface under strain is determined from the magnetoacoustic dHvA amplitude. The strongest deformation potential coupling is found for three equivalent pockets which become inequivalent under orthorhombic strain. The lifting of their degeneracy leads to the softening of theT 3 elastic constant. This is different from the useual band Jahn-Teller effect which is based on the lifting of subband degeneracy at a single point ink-space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304242
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  • 8
    Electronic Resource
    Electronic Resource
    Normal-state and superconducting properties of HfV2 (1985)
    Springer
    The European physical journal 60 (1985), S. 387-392 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present experimental results for the low-temperature specific heat, electrical resistivity, elastic constants, ultrasonic attenuation and thermal conductivity of theC 15 Laves phase HfV2 for both polycrystalline and single crystal samples. BelowT c =9 K, the temperature dependence of the specific heat can roughly be approximated by aT 3 law over a large temperature range. This may be explained with strong coupling effects in consistence with the high value for ΔC/γT c =1.9. Heat transport appears dominated by the known phonon contribution also belowT c . There is no electronic contribution to the ultrasonic attenuation in HfV2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304460
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal expansion, sound velocities, specific heat and pressure derivative ofT c in YBa2Cu3O7 (1988)
    Springer
    The European physical journal 69 (1988), S. 459-463 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report measurements, between helium and room temperature, of the thermal expansion α(T), sound velocitiesv L (T) andv T (v) and specific heatC(T) of YBa2Cu3O7 samples, all cut from the same sintered pellet. A linear term in α(T) is resolved at low temperatures. It is compared with a corresponding term in the low temperature specific heat and, using the bulk modulus from our sound propagation measurements, a Grüneisen parameter of usual size (1.2±0.4) is derived-in conformity with the possible existence of non-superconducting carriers well belowT c . Longtime drift effects in the length of the sample between 30 K and 60 K point to the vicinity of a structural instability. The Debye temperature derived fromC(T) amounts to about 450 K atT=T c =91 K and forT→0 approaches 350 K, in agreement with the value deduced fromv L (T) andv T (T). The superconducting transition is indicated by anomalies with idealized discontinuities Δα and ΔC. A thermodynamic relation between Δα and ΔC yields the relative pressure derivative ofT c ,t p =T c −1 (∂T c /∂p) p→0=+(0.7±0.2)·10−7 kbar−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312506
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  • 10
    Electronic Resource
    Electronic Resource
    Comment on the observation of magnetoacoustic quantum oscillations in UBe13 (1993)
    Springer
    The European physical journal 91 (1993), S. 135-137 
    Details
    ISSN: 1434-6036
    Keywords: 72.55.+S
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The origin of previously reported magnetic quantum oscillations in UBe13 is possibly due to Al inclusions. New measurements of the a.c. susceptibility show Al inclusions which result from the method of crystal growth using aluminium as flux. We discuss the distribution and form of the inclusions and compare our dHvA measurements with those of the γ-orbits of Al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01315226
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