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  • 1
    Digitale Medien
    Digitale Medien
    HF infrared chemiluminescence. Relative rate constants for hydrogen abstraction from hydrocarbons, substituted methanes, and inorganic hydrides (1977)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 81 (1977), S. 898-905 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100524a019
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  • 2
    Digitale Medien
    Digitale Medien
    Transformation of 1-azirines to 1H-indoles with benzyne. Evidence for the intermediacy of the 3H-indole system (1975)
    s.l. : American Chemical Society
    The @journal of organic chemistry 40 (1975), S. 3784-3786 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo00913a039
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  • 3
    Digitale Medien
    Digitale Medien
    Voltage dependence of magnetoresistance in magnetic tunnel junctions with AlN tunnel barrier (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1095-1098 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The voltage dependence of magnetoresistance (MR) and the low-frequency voltage fluctuation were studied in magnetic tunnel junctions with an AlN or an Al2O3 barrier formed by plasma nitridation or oxidation. The junctions consist of free and pinned NiFe layers by a FeMn antiferromagnetic layer. For the Al2O3 junction, the variation of half-reduction voltage of MR is about 50 mV from 401.3 mV in maximum to 351.4 mV in minimum depending upon the oxidation time. For the AlN junction, the less nitrided junction with a nitridation time of 120 s shows the higher-half-reduction voltage by about 100 mV than for optimally nitrided or oxidized ones. From the low-frequency voltage noise data, the less nitrided AlN junction shows larger 1/f noise magnitude compared with other junctions with an optimal condition, implying more defect states in the barrier due to unnitrided Al metals. In order to investigate the influence of nitrogen on ferromagnetic layer, another junction with an Al2O3 barrier was made after the pinned NiFe layer was exposed to N2 plasma for 10 s. This junction reveals a lower MR and worse bias voltage dependence than any junctions studied here. The voltage dependence of MR, therefore, is likely influenced by the interface state rather than the defects in the barrier, although the two factors play an important role in determining MR. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1488252
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  • 4
    Digitale Medien
    Digitale Medien
    Amplification of transverse acoustic phonons in quantum well heterostructures with piezoelectric interaction (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 3934-3941 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have analyzed amplification of transverse phonons confined in quantum well (QW) heterostructures through piezoelectric electron–phonon interaction with drifting electrons. It was found that this mechanism of interaction couples the low-dimensional electrons and the shear-horizontal (SH) confined phonons. We have studied the electrostatic potential accompanying the SH waves and found that efficient interaction can be achieved for the lowest antisymmetric SH phonon branch in a narrow band of phonon frequencies. For AlGaAs QWs the amplification coefficient was calculated to be on the order of 100 cm−1 in the sub-THz phonon frequency range. These results suggest an electrical method for coherent phonon generation in the technologically well-developed AlGaAs QW heterostructures. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1402145
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  • 5
    Digitale Medien
    Digitale Medien
    CO2 laser–plume interaction in materials processing (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 681-688 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In laser materials processing, localized evaporation caused by focused laser radiation forms a plume of mixed vapor and ambient gas above the material surface. The beam is refracted and absorbed as it traverses the plume, thus modifying its power density on the surface. In this work, plume–beam interaction is studied using an axisymmetric, high-temperature gas-dynamic model of a plume formed by vapor from an iron surface. The beam propagation in the plume is calculated from the paraxial wave equation including absorption and refraction. The simulation results quantify the effects of plasma plume properties on the beam radius and laser power density variations at the material surface. It is shown that absorption and refraction in the plume have significant impacts on the laser–material interaction. Absorption of the beam in the plume has much less direct effect on the power density at the material surface than refraction does. However, absorption is essential for the formation of the plume, without which there is no refraction. Helium gas is more efficient than argon for reducing the beam refraction and absorption effects. Laser energy reflected from the material surface has significant effects on the plume properties. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1329668
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  • 6
    Digitale Medien
    Digitale Medien
    The magnetic properties of nanocrystalline Fe-Co(Cr)–Hf–N thin films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5248-5250 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have investigated the effect of Co(Cr) substitution on magnetic properties of as-deposited Fe–Hf–N films. 4πMs increases with increasing Co content (3–16 at. %) and decreases with increasing Cr content. The film Fe56Co16Hf10N18(at. %) shows excellent soft magnetic properties, with 4πMs∼16.8 kG, Hc∼0.25 Oe, and effective permeability ∼4200 at 100 MHz. In Fe71Cr3Hf9N17, the permeability is about 5200 at 100 MHz, while the values of 4πMs and Hc are ∼14.6 kG and 0.5 Oe, respectively. In order to estimate the magnetic anisotropy, the angular dependency of the resonance magnetic field and linewidth were observed by ferromagnetic resonance (FMR) at 9.84 GHz. The Fe56Co16Hf10N18 film shows a single resonance peak, whereas the as-deposited Fe–Hf–N films shows weak secondary peaks. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.373310
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  • 7
    Digitale Medien
    Digitale Medien
    Discharge characteristics of a long pulse ion source for the Korea Superconducting Tokamak Advanced Research neutral beam system : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1140-1143 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The discharge characteristics of a prototype ion source for the Korea Superconducting Tokamak Advanced Research neutral beam system, which has been developed to meet the specification of 120 keV and 65 A beam during 300 s, were investigated. The relationships between the operation conditions, such as the filament current, the arc current (up to 1200 A), the pressure of the ion source, and the measured plasma parameters were studied, and the possibility of steady-state operation was checked. Langmuir probes were used in measuring the plasma parameters and the density distributions. The hydrogen ion density was 2.0×1011 cm−3, the electron temperature was lower than 5 eV, and the plasma uniformity around the bucket was within 30% in the optimum operation conditions. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150409
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  • 8
    Digitale Medien
    Digitale Medien
    A case of Trichosporon cutaneum folliculitis and septicaemia (2003)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 28 (2003), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Trichosporon cutaneum, a saprophytic fungal organism normally found in the soil, has been increasingly recognized as a cause of life-threatening systemic illness in immunosuppressed patients including those with leukaemia. Cutaneous involvement occurs in about 30% of patients with T. cutaneum septicaemia although disseminated folliculitis has not been described to our knowledge. We now describe a case of T. cutaneum follicultis due to fungaemia in a neutropenic patient.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2230.2003.01136.x
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  • 9
    Digitale Medien
    Digitale Medien
    Waldenström's macroglobulinaemia presenting as reticulate purpura and bullae in a patient with hepatitis B virus infection (2001)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 26 (2001), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Cutaneous manifestations of Waldenström's macroglobulinaemia (WM) include purpura, ulcers, urticaria, leukocytoclastic vasculitis, and immunobullous dermatoses. No association has been reported previously of WM and hepatitis B virus (HBV) infection. A 40-year-old female HBV carrier was admitted to hospital because of generalized oedema, oliguria, haematuria, hypertension, fever and blood-tinged sputum. Cutaneous manifestations included generalized petechiae, palpable purpura mainly on the legs, multiple necrotic ulcerations and gangrenous changes on the toes, and necrotic, giant confluent reticulate purpura on the trunk surmounted by several tense bullae. Laboratory investigations revealed monoclonal gammopathy of IgM kappa type (6.7 g/L), membranoproliferative glomerulonephritis associated with HBV infection, Bence Jones proteinuria, and an increased number of abnormal plasmacytoid cells in the bone marrow. Pathologic examination demonstrated immune complex-mediated vasculitis with deposits of IgM in the walls of dermal vessels and secondary subepidermal bulla formation. HBV infection may have caused WM or modified the clinical course in this fatal case.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2230.2001.00880.x
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  • 10
    Digitale Medien
    Digitale Medien
    Periungal hyperpigmentation induced by cisplatin (2002)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 27 (2002), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary A number of anticancer drugs are known to produce pigmentary changes affecting the skin or nails. Among them, cisplatin (cis-diamminedichloroplatinum)-induced hyperpigmentation has been described previously in only two cases. We describe an unusual case with hyperpigmentation confined to periungal areas of the hands and feet after treatment with cisplatin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2230.2002.00972.x
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