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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 6860-6872 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Dysphagia 6 (1991), S. 6-10 
    ISSN: 1432-0460
    Keywords: Fundoplication, Nissen ; Reflux, gastroesophageal ; Manometry, esophageal ; pH, esophageal recording
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Nissen fundoplication is a commonly used antireflux operation. After this operation symptoms such as dysphagia, inability to belch and vomit, and gas bloating are frequently reported in the literature. In 32 patients who underwent Nissen fundoplication 3.5–18 years ago, postprocedure dysphagia was studied using conventional manometry and 24 h ambulatory pressure and pH recording. Our study indicates that dysphagia tends to decrease after surgery. Neither conventional nor ambulatory pressure recording revealed motor abnormalities that could be held responsible for the dysphagia. Therefore, the data do not support the concept that dysphagia is a major complication of Nissen fundoplication.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Physics of the solid state 42 (2000), S. 734-738 
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experimental study is reported of the nonlinear magnetoelectric effect in the metastable orthor-hombic ferroelectric ferroelastic paramagnetic β′ phase of Gd2(MoO4)3 in magnetic fields of up to 20 T and at temperatures of 4.2 and 0.4 K. It is shown that the present models of the paramagnetoelectric effect can be reconciled with experiments only for low magnetic fields. A new approach to the description of the magnetoelectric effect in rare-earth molybdates is proposed, which is based on a model of single-ion magnetostriction.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    JETP letters 68 (1998), S. 327-331 
    ISSN: 1090-6487
    Keywords: 73.40.Hm ; 72.80.Ey ; 72.80.Ng
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The quantum Hall effect structure in the transverse magnetoresistance R xx and the Hall resistance R xy of heavily doped GaAs layers with a three-dimensional spectrum of the charge carriers is investigated for different field orientations. The characteristic structures (minima in R xx and plateaus in R xy ) shift much more slowly to higher fields and are suppressed much more rapidly in comparison with the expected angular dependence for a two-dimensional system. The results are discussed in terms of the anisotropic change of the three-dimensional conductivity tensor with magnetic field rotation.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1090-6487
    Keywords: 74.70.Kn ; 73.50.Jt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The interlayer magnetoresistance of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2)Br is measured at ambient pressure and under pressures of up to 12.5 kbar. In addition to the slow Shubnikov-de Haas oscillations with a frequency of ≃150 T observed at P⩾5 kbar, rapid oscillations attributed to the magnetic breakdown orbit enveloping an area equal to 100% of the area of the Brillouin zone are found to emerge above B=20 T. The latter oscillations are observed at ambient pressure as well as under pressures of up to 9 kbar.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of experimental and theoretical physics 90 (2000), S. 1042-1049 
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigated the in-plane magnetoresistance and the Hall effect of high-quality Bi2Sr2CuOx single crystals with T c (midpoint) = 3.7–9.6 K in dc magnetic fields up to 23 T. For T 〈 10 K, the crystals show the classical positive magnetoresistance. Starting at T ≈ 14 K, an anomalous negative magnetoresistance appears at low magnetic fields; for T ≥ 40 K, the magnetoresistance is negative in the whole studied range of magnetic fields. Temperature and magnetic field dependences of the negative-magnetoresistance single crystals are qualitatively consistent with the electron interaction theory developed for simple semiconductors and disordered metals. As is observed in other cuprate superconductors, the Hall resistivity is negative in the mixed state and changes its sign with increasing field. The linear T-dependence of cotθH for the Hall angle in the normal state closely resembles that of the normal-state resistivity as expected for a Fermi liquid picture.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4023-4034 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: From a combined theoretical and experimental study of 1,2,4,5-tetrachlorobenzene (TCB) we conclude that this crystal shows many interesting effects. In agreement with earlier optical measurements, which probe the complete vibron band structure of TCB, we calculate that several of the vibron modes have the dispersion of a one-dimensional crystal with stacks of molecules along the a axis. The inclusion of fractional atomic charges in the atom–atom potential used in the calculations is absolutely necessary to obtain the correct vibron bandwidths. Also the sign of the vibrational coupling matrix elements, which is given correctly by the calculations, is determined by these charges. For other properties, such as the crystal stability, the phonon frequencies, the site splitting in the vibron bands, and also the dispersion of the lower frequency vibrations, the interactions between the "one-dimensional'' stacks are essential, however. The calculations predict further, in qualitative agreement with the Raman spectra, that the splitting between the pairs of inequivalent vibron bands in α-TCB (the site splitting) is significantly larger than the factor group splitting in β-TCB. Finally we have found that, for those vibrations where the conditions are shown by the calculations to be favorable, the 35Cl/37Cl isotope effects are clearly visible in the Raman spectra.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3583-3596 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper describes a new approach to the dynamic and magnetic properties of solid α and β oxygen which is based on two theoretical developments. First, we have constructed the lattice and spin Hamiltonian for solid O2 by including explicitly the interactions between the triplet ground state O2 molecules as obtained mainly from recent ab initio calculations. The spin coupling parameters in this Hamiltonian, especially the Heisenberg exchange parameter J, are strongly dependent on the positions and orientations of the molecules. Secondly, we have developed an integrated scheme for lattice dynamics and spin wave calculations which uses this Hamiltonian. The actual mixing between the lattice modes, phonons and librons, and the magnons appears to be small; their interaction can be largely taken into account by renormalization of the coupling terms. In the lattice dynamics part of the calculation it is essential to include the Heisenberg term, since it is the extremely strong anisotropy of the coupling parameter J that explains the anomalously large libron splitting in α-O2. The spin-wave calculation with the Hamiltonian averaged over the lattice vibrations yields reasonable values for the magnon frequencies with no empirical fit parameters.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3597-3601 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Via simple thermodynamic arguments and via quantitative lattice dynamics and spin-wave calculations, we predict that the phase transition temperature Tαβ in solid oxygen and the optical libron frequencies in the α and β phases will both be lowered by an external magnetic field. The lowering of Tαβ varies from about 0.1 K at 7.5 T to about 1.2 K at 30 T. The lowering of the Bg and Ag libron peaks in the Raman spectrum of α-O2 and of the Eg peak in the β-O2 spectrum varies between 1.5 and 2.9 cm−1 at 30 T. These shifts can be explained by the magnetic field induced changes in the sublattice magnetizations, which affect the Heisenberg exchange contribution to the intermolecular potential. From ab initio calculations it is known that the Heisenberg coupling parameter J is extremely anisotropic.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 8444-8453 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report on a method that allows us to study with molecular dynamics a chemical reaction with an activation barrier that is much higher than the thermal energy. The method leads to a new Hamiltonian with which it is possible to compute reaction rate constants, and reactive trajectories even at low temperature. The method is applied to Xe desorption from Pd(100). The desorption rate constants are compared with transition state rate constants. The mechanism of the desorption is studied, and a model is given that explains the molecular dynamics results. Conversion of lateral into normal kinetic energy during the desorption process is shown to be important.
    Type of Medium: Electronic Resource
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