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  • 1
    Electronic Resource
    Electronic Resource
    Inelastic two-composite-particle system scattering theory at high energy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 30 (1989), S. 1365-1372 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In this paper, the methods of nucleons outside the closed shell (NOCS) and nucleons inside the closed shell (NICS) is introduced into the composite-particle systems, and Glauber's multiple scattering theory is used to divide the multiple scattering amplitude (between two composite particle systems) into NOCS–NOCS, NOCS–NICS, NICS–NOCS, and NICS–NICS scattering amplitudes. In order to apply these concepts to our research, an effective approximate method is used for each scattering amplitude. For example, an independent particle model approximation has been used for the NOCS–NOCS scattering amplitude. As for the NICS–NICS and NICS–NOCS scattering amplitudes, the geometrical model and Bohr's collective model are adopted, respectively. It can be shown that the high-energy scattering S matrix elements for composite-particle systems present a clear physical picture and render convenience to calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528318
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of the satellite reflections of the modulation and its thermal stability in single-crystal Bi2Sr2CaCu2Oy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 2924-2928 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The satellite distribution around the main reflections of the incommensurate modulation in Bi2Sr2CaCu2Oy has been studied by means of x-ray diffraction on a number of single crystals. The presence of the forbidden reflections which are incompatible with a B-centered Bravais lattice is found to be correlated with the spread of the mosaic blocks in the crystal sheet and therefore spurious to the distribution of the satellite reflections in the reciprocal space. Diffraction data collected for a highly oriented crystal annealed in flowing nitrogen at 650 °C for 60 h have shown that the structural modulation is coherent with the Bi2Sr2CaCu2Oy phase and robust to the anneal. Relationships between superconductivity, structural modulation, and oxygen content in the compound are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357531
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative, all-optical prediction of the carrier density in semi-insulating GaAs (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 647-649 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used a series of all-optical measurements to determine shallow acceptor, shallow donor, and midgap donor (EL2) concentrations. The validity of these measurements was then tested by comparing the predicted electron density to the measured Hall density. Resonant pumping of the first excited state of the polariton sharpened the photoluminescence spectrum sufficiently to allow a reliable measurement of the shallow donor to acceptor ratio. The absolute shallow acceptor, donor, and EL2 concentrations were determined by a series of absorption and luminescence measurements. The Fermi level and hence the carrier concentration was then deduced using the three-level model of semi-insulating behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102725
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  • 4
    Electronic Resource
    Electronic Resource
    The nature of a 2050–2150-cm−1 infrared band in neutron-transmutation-doped silicon grown by the floating-zone method in a hydrogen atmosphere (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 5606-5608 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A strong, wide infrared absorption band in 2050–2150-cm−1 range has been found in neutron-transmutation-doped silicon grown by the floating-zone method in a hydrogen atmosphere and annealed at 650 °C. This band is due to the stretching vibration of the Si–H bond, formed as hydrogen atoms diffuse, aggregate, and saturate silicon dangling bonds in the neutron-irradiation disordered region. This absorption band is similar to that of hydrogenated amorphous silicon in the 1900–2150-cm−1 range except that its vibration frequency is somewhat higher. The disordered region defect and its amorphous-siliconlike property could be observed because of the incorporation of hydrogen. The hydrogen concentration of the floating-zone melted silicon grown in a hydrogen atmosphere used in this study is estimated to be (1–2)×1017 cm−3 on the basis of the strength of this wide infrared absorption band. A possible reason for this vibration frequency shift is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340342
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  • 5
    Electronic Resource
    Electronic Resource
    High-resolution infrared spectroscopy of isotopic impurity Q1(0) transitions in solid parahydrogen (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 4461-4481 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have made a high-resolution infrared spectroscopic study of the Q1(0) (v=1←0, J=0←0) vibrational transitions of the isotopic impurities D2 and HD in solid parahydrogen. Each impurity has a spectrum composed of ∼100 sharp lines spread over ∼0.4 cm−1. The linewidths vary, but are on the order of 10 MHz. These spectra make clear: (1) the infrared Q1(0) transitions of J=0 isotopic impurities are induced by the quadrupolar fields of nearby impurity J=1 molecules; and (2) the spectral pattern of strong Q1(0) lines is due to the splitting of the M-orientational levels of J=1/J=0 o-D2 or J=1/J=0 HD nearest-neighbor (nn) impurity pairs. With the aid of several theoretical works, the strong lines in the D2 and HD spectra can be individually and unambiguously assigned as specific quantum state Q1(0) transitions of nn impurity pairs containing p-D2/o-D2 or o-H2/o-D2, and o-H2/HD, respectively. The assigned transitions of nn impurity pairs containing o-H2 are confirmed by combination differences which agree to within 5×10−4 cm−1, the instrumental precision. These assignments yield complete Q1(0) energy level diagrams for the nn impurity pairs o-H2/o-D2 and o-H2/HD embedded in solid parahydrogen. The experimental energy level splittings are fit to a two parameter model which describes anisotropic interactions in the parahydrogen crystal. These experimental parameters appear to have significant contributions from the changes in renormalization and lattice constant around the heavier isotopic impurity. We have also assigned a few of the weaker spectral features as Q1(0) transitions of more distant impurity pairs, but the bulk of these transitions are yet to be assigned. They do form a distinctive pattern and are thought to be the Q1(0) transitions of impurity triples and larger clusters. This study is one of the few cases for which high-resolution laser spectroscopy has been successfully applied to the condensed phase and for which many of the transitions have rigorous quantum state assignments. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472298
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  • 6
    Electronic Resource
    Electronic Resource
    Strong- and nondegrading-luminescent porous silicon prepared by hydrothermal etching (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 389-391 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Porous silicon (PS) with strong and nondegrading photoluminescence (PL) is prepared by iron-passivating hydrothermal etching. The PL peak intensity of freshly as-prepared PS is as ∼2 times strong as that of conventionally anodized PS. This peak intensity reaches a saturation after the samples are annealed at 120 °C for ∼3 h, which is ∼2.5 times strong as that of freshly prepared samples. Exposing the annealed samples to air for ten months, no degradation of the PL intensity occurs and the peak energy remains constant all through the period. Microstructural studies disclose that the participation of iron ions in the hydrothermal process is crucial to the generation of the high-density silicon nanocrystallites and the construction of the solid surface passivation. These two structural properties are responsible for the strong and nondegrading PL of as-prepared PS. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123080
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  • 7
    Electronic Resource
    Electronic Resource
    Theoretical issues for critical currents of bulk polycrystalline YBa2Cu3O7−δ superconductors (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1886-1888 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of grain orientation and weak-link coupling between grains on the critical current of polycrystalline Y-Ba-Cu-O superconductors has been investigated by numerical methods. The theoretical results indicate that there is size effect on jC in bulk polycrystals, and that it is not necessary to consider the influence of grain orientation when jC is less than 105 A/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344346
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  • 8
    Electronic Resource
    Electronic Resource
    Superconductivity of Sb-doped BiPbSrCaCuO compounds (abstract) (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5083-5083 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Extensive studies on Pb-doped Bi-Ca-Cu-O superconductors have seldom produced a single-phase Bi-based superconductor from a magnetic point of view without the 80-K phase in it, even though zero-resistance has been commonly observed around and above 100 K. This is mainly because of the additional intergranular phases controlled by calcium and copper diffusion which appears to be extremely sensitive to even minute traces of impurities. Hence, recent reports on the observation of superconductivity above 130 K in Sb-doped Bi-based alloys is of interest. We have prepared a number of Bi-based superconducting compounds containing Pb and/or Sb using the computerized coprecipitation method (which gives powders of submicrometer size particles) as well as a solid-state diffusion technique. The role of excess Ca on the superconducting properties have also been studied. Effects of various short- and long-term heat treatment conditions have also been investigated. The final pelletized samples have been characterized by x-ray, electrical, and magnetic property measurements. In most cases, Tc (R=0) of a sample can be easily enhanced to 105–110 K by modifying the annealing conditions. However, we have not yet been able to verify the claims of Tc(R=0) over 130 K although a small portion with Tc(onset) over 130 K does appear sometimes. Samples without Sb have to be annealed in air over 60 h to reach high Tc(R=0) than 100 K while those with Sb substitution need a maximum of 24 h to achieve the higher Tc. ac susceptibility studies over four decades of field amplitudes (3 mOe–30 Oe) show, below the diamagnetic onset temperature at 110 K, a knee around 100 K, which is perhaps due to intergranular low-field penetration. In any case in these samples it is possible to completely suppress the 80-K phase. From dc magnetic data we find that in these Sb-doped samples Jc(transport) can be varied from 350 to 1500 A/cm2 at 4.2 K, and is weakly field dependent as compared to those without Sb-doping. Systematic studies will be presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344680
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  • 9
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    Mechanical properties and magnetocaloric effects in La(Fe, Si)13 hydrides bonded with different epoxy resins (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-02-12
    Description: The mechanical properties and magnetocaloric effect (MCE) of bonded La(Fe, Si) 13 hydrides have been studied in detail. The mechanical strength increases with increasing the grade of epoxy resin from E-20 to E-51. This occurs because more pores and boundaries are filled with high grade resin since high epoxide content increases the degree of crosslinking and reduces the viscosity and shrinkage of resin. The compressive strength reaches 162 MPa for the bonded LaFe 11.7 Si 1.3 C 0.2 H 1.8 with 3 wt. % E-51, which is 35% higher than that of bulk LaFe 11.7 Si 1.3 C 0.2 compound (120 MPa). The mass Δ S M values remain almost same in bonded hydrides and are in a good agreement with the theoretical value. The maximum volumetric Δ S M values are 61.8, 58.0, and 54.7 mJ/cm 3 K for bonded hydrides with epoxy resins E-20, E-44, and E-51, respectively, much higher than those of some magnetocaloric materials in same temperature range. The improved mechanical properties and large MCE indicate that bonded LaFe 11.7 Si 1.3 C 0.2 H 1.8 is a promising material for room temperature magnetic refrigeration.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 10
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    Major contributor to the large piezoelectric response in (1 − x)Ba(Zr0.2Ti0.8)O3 − x(Ba0.7Ca0.3)TiO3 ceramics: Domain wall motion (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-06-28
    Description: The piezoelectric activity of lead-free Ba(Zr 0.2 Ti 0.8 )O 3 - x (Ba 0.7 Ca 0.3 )TiO 3 (BZT- x BCT) ceramics has been investigated as a function of composition by using Rayleigh analysis under subswitching-electric-field in combination with large-electric-field strain measurement. The result shows that the intrinsic piezoelectric response exhibits peak values in the vicinity of composition-induced R (rhombohedral)-MPB (morphotropic phase boundary) and MPB-T (tetragonal) phase transitions, but being much less than total d 33 value. On the other hand, the extrinsic piezoelectric r e sponse, especially the one associated with reversible domain wall motion, has been greatly enhanced in the phase instability regime. Our results indicate that the extrinsic piezoelectric activity is the major contributor to the high piezoelectricity in BZT- x BCT ceramics.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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