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  • 1985-1989  (10)
  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Observation of collision-induced-dipole absorption bands in strontium–rare-gas mixtures. II. Bands involving high-lying states (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4499-4503 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have observed many collision-induced-dipole (CID) absorption bands arising from the transitions between quasimolecular ground and high-lying (n≤10) states in the strontium–rare-gas systems. For each absorption band, we have measured the energy shift of the absorption peak from the energy of the correlating atomic forbidden transition and the effective oscillator strength per unit perturber density fCID/Np. The shift is roughly proportional to the electron scattering length L0 for each rare-gas atom, whereas the fCID/Np is roughly proportional to L20. The shift decreases in general as the principal quantum number n increases, and increases as one goes from the s state to the d state, and to the degenerate manifold state with l≥3. These general features of the shift and fCID/Np are consistent with the predictions by a simple Fermi-potential model, suggesting the important role of the interaction between a Rydberg electron and a rare-gas atom in the CID absorption processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456788
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  • 2
    Electronic Resource
    Electronic Resource
    Observation of collision-induced-dipole absorption bands in strontium–rare-gas mixtures. I. The 5s–4d bands (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4495-4498 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Reduced absorption coefficients have been measured for the collision-induced-dipole (CID) absorption bands associated with the 5s–4d transition of atomic strontium perturbed by He, Ne, Ar, Kr, Xe, and Sr. The main CID absorption band, assigned to 5sΣ–4dΣ, extends from the position of the atomic 5s–4d transition towards the shorter-wavelength side for every perturber. For Xe and Kr, an additional small absorption band is seen at the foot of the atomic 5s–4d transition. The former 5sΣ–4dΣ band is interpreted to result from collisional mixing of the 5p state of atomic Sr into the molecular 4dΣ state for small internuclear separations, while the latter band is interpreted to result from the collisional quadrupole (strontium)–dipole (Xe or Kr) interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456787
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Superconducting glass ceramics with Tc=100 K based on the Bi-Pb-Sr-Ca-Cu-O system (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1169-1171 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting glass ceramics of Bi0.8Pb0.2SrCaCu1.5Oy (sample A) and BiPb0.2SrCaCu1.5Oy (sample B) have been prepared by using the melt quenching method. It was found that the volume fraction of the high Tc phases in sample A annealed at 830 or 840 °C for 250 h was much higher than that in sample B. The annealed (840 °C, 250 h) sample A exhibited superconductivity with a Tc (zero) of 100 K and a critical current density (77 K, zero magnetic field) of 120 A/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101482
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  • 4
    Electronic Resource
    Electronic Resource
    A nonlinear analysis of the kinetics of reversible structural relaxation in Co-Fe based metallic glasses (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4853-4859 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The kinetics of reversible resistivity changes during structural relaxation in various Co-Fe based metallic glasses was examined using a nonlinear kinetic form Ψ=exp[−(t/τm)n]. It was found that the data excellently fit the nonlinear kinetic form. The compositional dependence of the kinetic parameters (distribution parameter n, activation energy Ea, and preexponential factor τ0) were obtained, and the microscopic mechanism of atomic rearrangements during the relaxation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341233
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Relationship between changes in compositional short-range order and field-induced anisotropy in amorphous Co58.3Fe4.7Ni10Si11B16 alloy (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 4237-4244 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Relationship between the changes in compositional short-range order (CSRO) and field-induced anisotropy (Ku) was studied in the amorphous zero-magnetostrictive alloy of composition Co58.3Fe4.7Ni10Si11B16, which has an appropriate Curie temperature (Tc) and high-crystallization temperature. Resistivity measurements after quenching from preannealing temperature (TQ) show that the reversible CSRO can be separated from the nonreversible topological short-range order. Resistivity change (Δρ/ρ) and Ku change (ΔKu) were measured isothermally at 250 °C (〈Tc) and also isochronally in the sample quenched from TQ. It was found that [d/Δρ/ρ)/dt]/[d(ΔKu )/dt] is constant and the higher TQ is, the larger both d(Δρ/ρ)/dt and d(ΔKu )/dt are. The approximate theory of the kinetics of both CSRO and Ku were given and it can explain the observed changes in Δρ/ρ and ΔKu. By assuming that the tail of the distribution of sizes of the interstitial sites in the soft-sphere dense random-packing model can act as a vacancylike defect, the formation mechanism of ΔKu which can explain the observed experimental facts was proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335558
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrastructural studies on the pathogenesis of poliomyelitis in monkeys infected with polivirus (1984)
    Springer
    Acta neuropathologica 64 (1984), S. 53-60 
    Details
    ISSN: 1432-0533
    Keywords: Poliomyelitis ; Poliovirus ; Monkeys ; Pathogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Poliovirus was inoculated intraspinally into cynomolgus monkeys to determine whether nerve cell damage in the central nervous system (CNS) is due primarily to virus multiplication in the neuron or to secondary effects of virus multiplication in the supporting cells. Electron-microscopically, the development of cytopathogenesis and of membrane-bound vesicles and virus particles in the neurons of the CNS in monkeys infected with poliovirus was compared with that of infected cultured cynomolgus monkey kidney (CMK) cells. The structure of membrane-bound vesicles in cytoplasm of damaged motoneuron was examined and found to be similar to the vesicles in infected cultured CMK cells. Virus-like particles were detected occasionally around or within membrane-bound vesicles in the cytoplasm of degenerating motoneurons as well as cultured CMK cells, although intracytoplasmic crystals were not detected in the neuron. No virus particles or membrane-bound vesicles were found in astrocyte foot plates, microglia, oligodendrocytes, axons, vascular endothelial, and inflammatory cells. In addition, poliovirus antigen was detected only in the nerve cells of the CNS by the immunoperoxidase technique, although specific staining was never found in the supporting tissues. From the present results we suggest that membrane-bound vesicles in the cytoplasm of the motoneuron are closely correlated with virus multiplication and that damage of the nerve cell is due to the direct action of the poliovirus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695606
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    ESR and Mössbauer studies of the precipitation process of various ferrites from silicate glasses (1984)
    Springer
    Journal of materials science 19 (1984), S. 2353-2360 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract ESR and Mössbauer studies of the precipitation process of various ferrites from silicate glasses were made to characterize the precipitation mechanism. The changes in linewidth (ΔH 1/2) and effectiveg-value (g eff) in the ESR spectra of the precipitation process are well explained in terms of super-exchange interaction between magnetic ions and interparticle dipolar interaction between precipitated ferrites. The precipitation tendency of spinel type ferrites from silicate glasses was found to be in the following order: NiFe2O4≫CoFe2O4〉Fe3O4≧ZnFe2O4, MnFe2O4. The above order coincided with the order of octahedral site preference energies of divalent transition metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058111
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  • 8
    Electronic Resource
    Electronic Resource
    Structural relaxation and embrittlement in Fe-Ni based metallic glasses (1985)
    Springer
    Journal of materials science 20 (1985), S. 1375-1382 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The fracture strain, changes in electrical resistivity and Curie temperature, and the volume change (the amount of annealed-out excess volume) were measured as a function of annealing temperature in some Fe-Ni based metallic glasses (Fe27Ni53P14B6, Fe29Ni49P14B6Si2, Fe40Ni40P14B6, Fe40Ni38Si8B14 and Fe63Ni15Si8B14), in order to clarify the embrittlement behaviour during structural relaxation. A close relationship between the ductile-brittle transition temperature and the resistivity change was observed in these metallic glasses. Particularly, in Fe27Ni53P14B6 metallic glass, it was found that the ductile-brittle transition temperature is well consistent with the annealing temperature at which the changes in resistivity and Curie temperature are maximum. The results obtained in the present study indicate that the embrittlement behaviour during structural relaxation in these Fe-Ni based metallic glasses is closely related to the formation of more stable short range ordered structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026335
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  • 9
    Electronic Resource
    Electronic Resource
    Correlation between changes in Curie temperature and electrical resistivity during structural relaxation in Fe27Ni53P14B6 metallic glass (1985)
    Springer
    Journal of materials science 20 (1985), S. 3271-3276 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Changes in Curie temperature (ΔT c, electrical resistivity (Δϱ/ϱ) and volume (ΔV/V) caused by isochronal annealing in as-quenched and pre-annealed Fe27Ni53P14B6 metallic glasses were compared. It was found that the ΔT c against annealing temperature (T a) curves in as-quenched and pre-annealed samples are very similar to the Δϱ/ϱ against T a curves. Particularly, almost a linear relationship was observed between ΔT c and Δϱ/ϱ in the pre-annealed sample. The results strongly suggest that the origins of both ΔT c and Δϱ/ϱ during structural relaxation in the pre-annealed sample are attributed to identical, reversible, short-range ordering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545194
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  • 10
    Electronic Resource
    Electronic Resource
    Resistometric study on kinetics of reversible short-range ordering and crossover effect in Fe15Ni63Si8B14 metallic glass (1986)
    Springer
    Journal of materials science 21 (1986), S. 1693-1699 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The kinetics of reversible short-range ordering (SRO) and crossover effect in the fully stabilized Fe15Ni63Si8B14 metallic glass were examined by measurements of electrical resistivity change. The kinetic parameters for reversible SRO in the narrow temperature range from 240 to 280° C were determined to be 1.93eV for the activation energy, 8.6×10−16sec for the preexponential factor and 2.3 for the width of the distribution of relaxation times on the assumption of a log-normal distribution. The crossover effect in reversible short-range ordering and disordering was clearly observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01114727
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