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  • 1995-1999  (8)
  • 1970-1974  (4)
  • 1
    Electronic Resource
    Electronic Resource
    The fine structure of the pulmonary stretch receptor in the rat (1974)
    Springer
    Anatomy and embryology 143 (1974), S. 215-222 
    Details
    ISSN: 1432-0568
    Keywords: Lung ; Stretch receptors ; Light microscopy ; Electron microscopy ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Lappenbronchien (3./6.) (Durchmesser bei mittlerer Inspirationslage 500–700 μ) von männlichen und weiblichen Wistarratten wurden licht- und elektronenmikroskopisch untersucht. Diese Bronchien entsprechen im Wandbau den mittleren Bronchioli größerer Säugetiere. Freie, verzweigte lanzettförmige Terminalfasern werden im Bindegewebe der lamina propria beschrieben. Sie sind in das elastisch muskuläre System der Bronchuswand eingebaut. Die zugehörige markhaltige afferente Nervenfaser ist verzweigt und hat einen Durchmesser von 4–6 μ. Außerdem werden efferente motorische Endigungen an der glatten Bronchialmuskulatur beschrieben. Die freien lanzettförmigen und verzweigten Terminalfasern sind möglicherweise Dehnungsrezeptoren für den Hering Breuer Reflex.
    Notes: Summary In rats the 3rd to 6th bronchi, measuring 500–700 μ in diameter during inspiration, were investigated by light and electron microscopy. The histological appearance of these bronchi is comparable to that of medium sized bronchioles of larger animals. The branched and lanceolate terminals are associated with the connective tissue of the lamina propria and the smooth muscle cell layer. In this way the terminals are bound to the myoelastic system of the bronchial wall. The myelinated afferent fiber is branched and the diameter measures about 4–6 microns. Besides afferent nerve terminals these are numerous efferent endings on the smooth muscle basement laminae. It is supposed that the described receptor represents the pulmonary stretch receptor of the Hering Breuer reflex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00525771
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum and semiclassical oscillations in the organic metal (BEDO-TTF)2Clx(H2O)y (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 621-627 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study quantum (Shubnikov-de Haas and de Haas-van Alphen) oscillations and angular oscillations of the reluctance in the organic quasi-two-dimensional metal (BO)2Clx(H2O)y. We show that the Fermi surface in this compound consists of a slightly corrugated cylinder with its axis perpendicular to the conducting plane. The cross section of the cylinder in this plane is a perfect circle of radius k F≃3×107 cm−1. The effective carrier mass associated with this cylinder is m*=(1.65–2.0) m 0 in the conducting plane, while the Dingle temperature is T D=3–4 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558702
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  • 3
    Electronic Resource
    Electronic Resource
    Galvanomagnetic properties of the new organic metal ET2TlHg(S0.45Se0.55CN)4 (1997)
    Springer
    Journal of experimental and theoretical physics 85 (1997), S. 1192-1195 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetoresistance and magnetic torque have been studied in the single crystals of the mixed complex (ET)2TlHg(S0.45Se0.55CN)4. The quantum oscillations (Shubnikov-de Haas and de Haas-van Alphen) have been observed and investigated in details in this compound. The behavior of these oscillations is close to that in the complex (ET)2TlHg(SeCN)4 but is characterized by a stronger carrier scattering induced by the disordered positions of the S and Se atoms in the anion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558392
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  • 4
    Electronic Resource
    Electronic Resource
    de Haas-van Alphen oscillations and angular magnetoresistance oscillations in the organic metal κ-(BETS)2GaCl4 (1999)
    Springer
    Journal of experimental and theoretical physics 88 (1999), S. 114-117 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Quantum de Haas-van Alphen oscillations and semiclassical angular magnetoresistance oscillations are observed in the quasi-two-dimensional organic metal κ-(BETS)2GaCl4. The behavior of these oscillations attests to the existence of two cylindrical Fermi surface sheets with axes perpendicular to the conducting plane. The cross-sectional areas of these cylinders in the conducting plane are equal to about 20 and 100% of the corresponding cross section of the Brillouin zone. It is shown that the many-particle interaction can be suppressed significantly in this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558772
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  • 5
    Electronic Resource
    Electronic Resource
    A novel and sensitive Faraday-type magnetometer for the field range from 0 to 12 T (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3755-3760 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Faraday-type magnetometer is described in which the magnetic force is measured capacitively by monitoring the displacement of a spring-suspended quartz sample holder. A double gradient coil is used in order to compensate the force on the empty sample holder, thus minimizing the background signal. The magnetometer can be used at any temperature down to 1.4 K and has an ultimate sensitivity for magnetic moments of 2×10−6emu (G cm3).© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148022
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  • 6
    Electronic Resource
    Electronic Resource
    Structure and function of cold receptors (1974)
    Springer
    Pflügers Archiv 352 (1974), S. 1-10 
    Details
    ISSN: 1432-2013
    Keywords: Thermoreceptors ; Cold Receptor ; Ultrastructure ; Receptor Morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Afferent impulses were recorded from single fibers serving cold and warm receptors in the skin of the cat's nose. The receptors were carefully tested for specificity and the receptive fields localized under the microscope with a microthermode. Each single fiber served one spot-like receptive field. The field was marked without damaging the nerve ending by inserting two thin stainless steel wires into the skin on both sides of the receptor. Investigation of semithin and ultrathin serial sections by light and electron microscopy revealed beneath each cold spot a dermal papilla which contained a single small myelinated fiber dividing into a number of unmyelinated terminals. Near the epidermis the receptor branches leave their Schwann cell envelope, penetrate the basal lamina of the epithelium, and their tips are invaginated into the cytoplasm of the basal epithelial cells. The basal lamina of the epithelium fuses with that of the receptor axon. The receptor axons contain numerous mitochondria, glycogen particles and a filamentous receptor matrix with vesicles of various sizes. The described structures were absent beneath the warm spots. In addition to the cold receptors, Merkel cell neurite complexes and lamellated encapsulated endings were found that are known to be mechanoreceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061945
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  • 7
    Electronic Resource
    Electronic Resource
    Specific heat and magnetic susceptibility of UPt3 and UBe13 at mK-temperatures (1995)
    Springer
    The European physical journal 97 (1995), S. 55-58 
    Details
    ISSN: 1434-6036
    Keywords: 74.70.T ; 65.40.E ; 74.30.C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the specific heat capacity of a single crystal of UPt3 in zero magnetic field, in 2 T, and in 4 T (above $$B_{C_2 } $$ )with the adiabatic warm-up method down to a final temperature of 15 mK. The results prove our previous assumption that the normal state of UPt3 exhibits a similar, slightly modified specific heat anomaly around 20 mK as is present in the superconducting state. It is most probably a signature of long range magnetic order. Entropy balance aboveT C is fulfilled if both low-temperature peaks are included. For UBe13 (in the superconducting state) we find no specific heat anomaly down to 24 mK but a deviation from the power law valid at higher temperatures. DC-magnetization measurements on a second single crystal of UPt3 in a SQUID system yield a temperature dependence ∼T 2 between 150 and 20 mK extending the temperature range of earlier measurements by a factor of 4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317587
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  • 8
    Electronic Resource
    Electronic Resource
    Low Temperature Specific Heat of the Kondo-Semimetal CeNiSn in Zero and Applied Magnetic Fields (1999)
    Springer
    Journal of low temperature physics 115 (1999), S. 291-306 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The specific heat of several CeNiSn single crystals of various purity has been measured in the temperature range from 25 mK to 5 K and in magnetic fields from zero to 7 Tesla. At very low temperatures (below ∼200 mK) the specific heat is found to vary linearly with temperature (C=γT), the coefficient γ decreasing with increasing purity. Above 200 mK, the specific heat is well described as the sum of a linear and a quadratic term. An applied magnetic field affects mostly the linear term, which first slightly decreases, then strongly increases with field. In magnetic fields, a nuclear hyperfine specific heat contribution is superimposed, which is due mostly to the bare Zeeman-splitting of the 115 Sn, 117 Sn, 119 Sn nuclei (all with spin I=1/2 and with abundances of 0.35, 7.61, and 8.58% respectively) in the externally applied field. The results on the specific heat at very low temperatures in applied fields fit into the model of an enhanced (heavy-fermion type) density of states which is modified by coherent antiferromagnetic fluctuations into a V-shaped density of states at the Fermi energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021883621341
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Nuclear cooling in PrCu6 (1972)
    Springer
    Journal of low temperature physics 9 (1972), S. 267-289 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear adiabatic demagnetization experiments have been performed in the Van Vleck paramagnet PrCu6 in order to determine the very-low-temperature nuclear magnetic properties of this material and to test its efficiency as a very low-temperature refrigerator. It is found that a temperature of 2.7 mK can be reached from an initial temperature of 40 mK and an initial field of 20 kOe. Susceptibility and specific heat measurements above 2.7 mK indicate the presence of both nuclear quadrupole and exchange interactions. The transition to an antiferromagnetically ordered state among the Pr nuclei is expected to occur below 2.7mK.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654847
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  • 10
    Electronic Resource
    Electronic Resource
    The influence of impurities and alloying in the Kondo semimetal CeNiSn as seen by μSR (1997)
    Springer
    Hyperfine interactions 104 (1997), S. 157-164 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependence of the muon spin relaxation rate \lambda was measured in two samples of CeNiSn with markedly different impurity content and in the quasi‐ternary compounds CePtxNi1-xSn (x=0.12,\ ,0.2) and CeCuxNi1-xSn (x=0.05,\ ,0.1,\ ,0.2) in order to study the development of magnetic correlations. No significant change in \lambda was found for the two samples of CeNiSn although their low temperature specific heat differs strongly. Hence μSR probes the intrinsic magnetic properties of the spin‐liquid state of CeNiSn. Replacing Ni with up to 20% Pt results only in minor changes of \lambda. In contrast, a strong effect is seen when Ni is replaced by Cu. Already at 10% Cu the system forms a spin‐glass‐like state below 0.9 K. At 20% Cu this behavior is strengthened, but antiferromagnetic order of the type seen in CePtSn or CePdSn is not reached. The results show further that the change in 4f hybridization initiated by volume expansion in the alloyed samples is not the dominating mechanism strengthening the magnetic correlations. Decisive is the increase in d electron density when replacing Ni by Cu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012619624796
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