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  • 1
    Electronic Resource
    Electronic Resource
    Human parvovirus B19 infection: Immunohistochemical and electron microscopic studies of skin lesions (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 22 (1995), S. 0 
    Details
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Erythema infectiosum is known to be caused by human parvovirus B19 and shows characteristic clinical skin manifestations in children, although adult cases of human parvovirus B19 infection do not always show such characteristic features. Recently, we experienced an epidemic adult cases of human parvovirus B19 infection and examined the erythematous skin lesion by immunohistochemistry and electron microscopy to clarify the pathogenesis of the skin manifestations. Light microscopic examination showed slightly irregular-shaped vessels in the dermis. By immunohistochemistry, using anti-human parvovirus B19 monoclonal antibody, positive reactions were found in endothelial cells. No immunoglobulins were found, but C3 deposits were present in the perivascular areas. By electron microscopy, virus particles were found in the cytoplasm of endothelial cells. An inflammatory reaction due to the direct human parvovirus B19 infection in dermal vessels seems to be an important factor in the pathogenesis of the skin manifestations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0560.1995.tb01402.x
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  • 2
    Electronic Resource
    Electronic Resource
    Nonradiative decay processes and mechanisms of frequency upconversion of Er3+ in ZrF4–BaF2–LaF3 glass (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 2940-2945 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the decay processes of the Er:4S3/2 and 4F9/2 states and the mechanisms of frequency upconversion under 800 nm excitation of Er3+ in ternary ZrF4–BaF2–LaF3 glasses. The decay processes of the Er:4S3/2 and 4F9/2 states are discussed on the basis of the Er concentration dependence of the fluorescence lifetime. The quantum efficiencies of emission of the 4S3/2 and 4F9/2 states are 73% and 25%, respectively. The difference in the quantum efficiencies between these states can be explained from the difference in the multiphonon decay rates: the multiphonon decay rate of the 4S3/2 state is much smaller than that of the 4F9/2 state. The multiphonon relaxation is a dominant nonradiative decay process of the 4F9/2 state. A dominant nonradiative decay process of the 4S3/2 state is self-quenching at high Er concentrations. The upconversion mechanisms under 800 nm excitation are also investigated from the dependence of upconversion luminescence on excitation wavelengths (800 and 980 nm), excitation laser power, and Er concentration. The mechanism of upconversion from 800 to 660 nm is mainly due to the energy transfer between the 4I9/2→4I13/2 and 4F9/2←4I11/2 transitions. We also show that the upconversion from 800 to 550 nm is due to excited-state absorption. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364324
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  • 3
    Electronic Resource
    Electronic Resource
    A dynamic study of domain formation mechanism during thermomagnetic recording based on micro-Hall effect measurements : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5700-5702 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method for analyzing the dynamics of domain formation during the thermomagnetic recording process has been developed based on the extraordinary Hall effect. A magnetic domain is written at the center of a cross-shaped magneto-optical sample having an area of 5×5 μm2, and the Hall voltage is monitored during the recording process. As far as domain nucleation is concerned, we find that the temperature gradient around the transition region (i.e., the region whose temperature is between the critical temperature for magnetization reversal and the Curie point) is very important. Under the conditions of high power and short pulse-width laser, a domain can form only during the cooling period. However, it is possible for a domain to form during the heating cycle under a low power, long pulse laser beam. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362222
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties and structure change from tetragonal to hexagonal for the rapidly quenched SmTiFe11 alloy ribbons (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5965-5967 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structure and magnetic properties of the rapidly quenched SmTiFe11 alloy ribbons fabricated under various quenching rates were systematically examined. Phase transformation from an equilibrium ThMn12-type structure (tetragonal) to a metastable TbCu7-type disordered structure (hexagonal) was found for the ribbons fabricated around the roll velocity, VR(approximately-equal-to)30 m/s. Magnetocrystalline anisotropy changed from uniaxial (Ku1=5.0×107 erg/cm3) to in-plane anistropy in accordance with the structure change from ThMn12- to TbCu7-type structure. Ms and Tc varied from 125 emu/g and 320 °C (ThMn12 type) to 114 emu/g and 242 °C (TbCu7 type), respectively. The maximum hard magnetic properties for SmTiFe11 alloy ribbons, iHc=3 kOe, (BH)max=3 MGOe, were obtained for the ribbons with a ThMn12-type structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342164
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  • 5
    Electronic Resource
    Electronic Resource
    Perpendicular magnetic anisotropy and magneto-optical properties of evaporated (Fe,Co)–rare-earth amorphous binary alloy films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5492-5494 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dependence of perpendicular magnetic anisotropy on temperature and composition has been investigated for various (Fe,Co)–rare-earth amorphous binary alloy films prepared by evaporation. The temperature dependence of the perpendicular magnetic anisotropy is proportional to the third power of the rare-earth sublattice magnetization. The perpendicular magnetic anisotropy consists of two terms related to concentration. One is proportional to the rare-earth content and the other to its square. Both terms can be explained by a large rare-earth single-ion anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342310
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  • 6
    Electronic Resource
    Electronic Resource
    Time-resolved magneto-optical experiments in Cd1−xMnxTe/ZnTe multiple quantum wells (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5938-5940 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical pump-probe experiments were performed in Cd0.9Mn0.1Te/ZnTe multiple quantum wells to study the dynamics of the exciton magnetic polaron in this material. Two transient absorptions of opposite sign were observed. The first signal is negative and indicates the decrease of optical absorption, as the excitons are approaching saturation. The second signal is positive and is interpreted as the absorption of "new excitons" after the initial excitons created by the pump pulse have decayed leaving behind a magnetic polarized Mn environment. The spin relaxation time of the Mn ions has been determined to be 601 ps. Finally, we discuss the effect of the polaron–polaron interaction, relevant in our experiment because we saturate the excitons in the quantum wells. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369997
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  • 7
    Electronic Resource
    Electronic Resource
    Time-dependent coupled cluster approach: Excitation energy calculation using an orthogonally spin-adapted formalism (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1486-1501 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In the time-dependent coupled cluster approach the excitation energies can be obtained as eigenvalues of a generally non-Hermitian matrix characterizing the homogeneous part of a linear response equation. This matrix consists of the Hermitian configuration interaction part as well as of a non-Hermitian part which describes the "renormalization'' due to ground state correlations. The relationship between a singular behavior of the ground state coupled cluster equations and the existence of vanishingly small excitation energies in the linear response formalism is pointed out. The explicit form of the required matrix elements in the orthogonally spin-adapted version of the theory is given for configuration spaces restricted to single and double excitations. A numerical test of the formalism for π-electron models of trans-butadiene and benzene is carried out and the relationship of the time-dependent coupled cluster approach with other many body approaches to excitation energies calculation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451241
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic relaxation in amorphous (Fe,Co)100−xBx alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3575-3577 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The disaccommodation and the uniaxial magnetic anisotropy induced by magnetic annealing were studied for rapidly quenched amorphous Fe100−xBx (12≤x≤25) and Co100−xBx (17≤x≤30) alloys. The disaccommodation exhibits a maximum between 150–250 °C for Fe-B and 50–250 °C for Co-B alloys. The compositional dependence of both disaccommodation and induced magnetic anisotropy constant exhibits an anomaly at x=20. The origin of disaccommodation is discussed in connection with the induced magnetic anisotropy. Further, the compositional dependence of induced magnetic anisotropy is discussed based on the compositional short-range ordering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335011
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  • 9
    Electronic Resource
    Electronic Resource
    Spin glass in Fe-Ni Invar alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3456-3458 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Initial ac susceptibility χ was examined in the temperature range from 4.2 K to Curie temperatures for polycrystalline Fe100−xNix (20≤x≤50) alloys. The reentrant spin glass is found in x=30–45 alloys. The dependence of the freezing temperature Tg on the intensity of driving magnetic field (ac: 0–0.26 Oe; dc: 0–10 Oe) and on the frequency (140–9200 Hz) was studied for the Fe65Ni35 alloy. A strong magnetic relaxation is observed below Tg. These results are discussed based on the cluster model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335075
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic characteristics of 3d transition-metal–mica intercalation compounds (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5766-5768 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of the M-mica intercalation compounds (M=Mn,Fe,Co, and Ni) in which M elements form a two-dimensional lattice between mica layers have been investigated. The content of the intercalated M element, x, was varied up to about 22 wt. %, which is about 81% with respect to the upper limit of x. The ac susceptibility measurements revealed the magnetic ordering around 10 K for the Fe- (x≥8.0 wt. %), Co- (x≥7.4 wt. %), and Ni-mica intercalation compounds, but did not for the Mn-mica. These magnetic orders are considered to be the two-dimensional ones, caused from the intralayer superexchange interaction between M2+ (and Fe3+) ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342252
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