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  • AIP Publishing  (7)
  • 1
    Online Resource
    Online Resource
    Effect of network on tunneling magnetoresistance in a half-metallic granular system
    AIP Publishing ; 2004
    In:  Journal of Applied Physics Vol. 95, No. 12 ( 2004-06-15), p. 8041-8045
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 95, No. 12 ( 2004-06-15), p. 8041-8045
    Abstract: The effect of resistor network on the characteristic features of tunneling magnetoresistance of half-metallic granular materials is studied by using a numerical simulation method. We assume the nanosized magnetic particles are well separated by insulating and nonmagnetic grain boundaries and that they are distributed in an n-dimensional resistor network. The value of the tunneling magnetoresistance is found to depend sensitively on the value of n, which is more obvious for higher spin-polarization materials. This phenomenon was also observed in experiments.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.1738534
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    High-resolution Absorption Spectra of Acetylene in 142.8152.3 nm
    AIP Publishing ; 2008
    In:  Chinese Journal of Chemical Physics Vol. 21, No. 5 ( 2008-10-01), p. 415-420
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 21, No. 5 ( 2008-10-01), p. 415-420
    Abstract: The absorption spectra of acetylene molecules was measured under jet-cooled conditions in the wavelength range of 142.8152.3 nm, with a tunable and highly resolved vacuum ultraviolet (VUV) laser generated by two-photon resonant four wave difference frequency mixing processes. Due to the sufficient vibrational and rotational cooling effect of the molecular beam and the higher resolution VUV laser, the observed absorption spectra exhibit more distinct spectral features than the previous works measured at room temperature. The major three vibrational bands are assigned as a C-C symmetry stretching vibrational progress (u2 = 02) of the C1 IIu state of acetylene. The observed shoulder peak at 148.2 nm is assigned to the first overtone band of the trans-bending mode u4 of the C1 IIustate of acetylene. Additionally, the two components, 4o2(1IIu) and 4o2(1 IIuare suggested to exhibit in the present absorption spectra, due to their RennerTeller effect and transition selection rule. All band origins and bandwidths are obtained subsequently, and it is found that bandwidths are broadened and lifetimes decrease gradually with the excitation of vibration.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/21/05/415-420
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 3
    Online Resource
    Online Resource
    Dissociation Dynamics of Nitrous Oxide from Jet-cooling Absorption Spectrum in 142.5–147.5 nm
    AIP Publishing ; 2011
    In:  Chinese Journal of Chemical Physics Vol. 24, No. 3 ( 2011-06-01), p. 267-274
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 24, No. 3 ( 2011-06-01), p. 267-274
    Abstract: The absorption spectrum of the C1II state of N2O molecule in the wavelength range of 142.5–147.5 nm has been measured under the jet-cooled condition, and the clear spectral features are displayed. A vibrational progression is observed with a frequency interval of about 500 cm−1. With the aid of potential energy surfaces (PES) of the low-lying electronic states of N2O, the vibrational progression is assigned as the bending mode of the repulsive C1II state. From the Fourier transformation analysis, the recurrence period of the periodic orbit near the transition state region is derived to be 65 fs. Through the least-square Lorentzian fitting, the lifetimes of the resonance levels are estimated from their profile widths to be about 20 fs, which is shorter than the recurrence period. Therefore, a new explanation is suggested for the observed diffuse spectral structure, based on the behavior of dissociating N2O on PES of the C1II state in the present excitation energy range.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/24/03/267-274
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 4
    Online Resource
    Online Resource
    Structural origin for vibration-induced accelerated aging and rejuvenation in metallic glasses
    AIP Publishing ; 2019
    In:  The Journal of Chemical Physics Vol. 150, No. 20 ( 2019-05-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 150, No. 20 ( 2019-05-28)
    Abstract: Glassy materials are nonequilibrium and their energy states have crucial influences on properties. Recent studies have shown that oscillating deformations (vibrations) can cause either accelerated aging (lowering energy) or rejuvenation (elevating energy); however, the underlying atomic mechanisms remain elusive. Using metallic glasses (MGs) as model systems, we show that the vibration-induced accelerated aging is correlated with the strain field of the stringlike atomic motions stemming from the Johari-Goldstein (β) relaxation, whereas the rejuvenation is associated with nonlinear response and the formation of nanoscale shear bands attributing to the activation of α relaxation. Both processes are affected by thermal fluctuations, which result in an optimal temperature for accelerated aging. These results suggest intrinsic correlations among relaxation dynamics, mechanical properties, and the vibration induced structural rearrangements in MGs.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.5094825
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 5
    Online Resource
    Online Resource
    Crystallitic orientation effects on charge transport in polythiophene thin-film transistors
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 96, No. 6 ( 2010-02-08)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 96, No. 6 ( 2010-02-08)
    Abstract: We simulate charge transport through polymer grain boundaries under the buried critical interface of polymer and dielectric in polythiophene thin-film transistors and find the recently observed enhancement of electronic conduction can be a result of optimized crystallitic orientation. The simulation is based on a first-principle description of the system with transport properties evaluated by nonequilibrium Green's function method. Highly oriented crystal is assumed inside each grain and four most probable configurations of crystallitic orientation for grain boundary are considered. The calculation confirms that the electronic conductance can differ by five orders in magnitude for different conformations.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3310023
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Study of electrical frequency response through the metal-insulator transition in highly conducting polymers
    AIP Publishing ; 2006
    In:  Journal of Applied Physics Vol. 100, No. 3 ( 2006-08-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 100, No. 3 ( 2006-08-01)
    Abstract: Based on a random resistor network (RRN), we study the electrical frequency response, including the unusual frequency dependent conductivity and multiple zero crossing of the dielectric function of highly conducting polymers. The electronic transport properties can be studied by modeling the system as a chain-linked granular network, with metallic regions randomly distributed in an amorphous host. Taking into account the contributions of coherent and incoherent transport channels, and the percolation effect of conducting polymers in our RRN model, we can well explain the negative value of ε and the low-energy structure of conducting polymers. The calculated ε(ω) and σ(ω) reproduce the main features of recent broadband optical experiments.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2219004
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 7
    Online Resource
    Online Resource
    Theoretical Study of RgNO (Rg=He, Ne, Ar and Kr) Complexes
    AIP Publishing ; 2007
    In:  Chinese Journal of Chemical Physics Vol. 20, No. 2 ( 2007-04-01), p. 113-118
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 20, No. 2 ( 2007-04-01), p. 113-118
    Abstract: RgNO (Rg=He, Ne, Ar and Kr) complexes were studied using ab initio calculations. The neutral RgNO complex geometry and vibrational frequencies were calculated with the cc-pVDZ basis set at the CCSD(T) level of theory. The calculations show that the geometry of the RgNO complexes is a skewed T-shape with the Rg atom on the oxygen side of the NO molecule, and that the RgNO bond angle increases with mass. The dissociation energies (DE) and ionization energies (IE) of the neutral RgNO complexes, and the dissociation energies of RgNO+ ionic complexes were calculated using Gaussian-2 (G2) methods and a high accuracy energy model. The ionization energies of the neutral RgNO complexes range from 9.265 eV for HeNO to 9.132 eV for KrNO and the dissociation energies of RgNO+ range from 0.017 eV for HeNO+ to 0.156 eV for KrNO+, in line with the expectation based on the increasing polarizability of the Rg atom.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1360/cjcp2007.20(2).113.6
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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