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  • Articles: DFG German National Licenses  (14)
  • 1
    Electronic Resource
    Electronic Resource
    Coupling of Ni and NiFe films through an intervening nonmagnetic film (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4451-4453 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic coupling of 20-nm-thick Ni and Ni78Fe22 films through intervening Ag film has been investigated by ferromagnetic resonance (FMR) at 33 GHz. Films were deposited by e-beam evaporation on glass in the order glass/Ag/Ni/Ag/NiFe/Ag. The Ag over- and underlays were 20 nm thick; the central Ag-film thickness was varied between 0 and 20 nm. The coupling of the two ferromagnetic films, A and B, through the interface is modeled by adding −KMA⋅MB to the free energy per unit area. The FMR-mode positions are found from the solutions of a quadratic in K. Subsequently, FMR-mode intensities and linewidths are computed. Input data for these calculations were obtained from observations made on uncoupled Ni and NiFe films. From in-plane dc-field date a variation of K was deduced with a coupling film thickness t of the form exp(−t/τ) with τ equal to 2.68 nm. Limited FMR data taken with the dc field normal to the specimen are consistent with a weak coupling, K∼t−0.83. Little coupling was found in a glass/SiO2/Ni/SiO2/NiFe/SiO2 sequence with the SiO2 films spanning the same thickness range as the Ag in the first sequence. It is believed that the coupling in Ni/Ag/NiFe is dominated by conduction-electron-spin polarization. Some of the coupling may be magnetostatic in origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344901
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  • 2
    Electronic Resource
    Electronic Resource
    Epitaxial growth of LaF3 on GaAs(111) (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 273-275 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first epitaxial growth of lanthanum trifluoride on the (111) surface of gallium arsenide. Smooth, crack-free, and high-crystalline quality films of thickness up to 200 nm were grown at 500 °C on a GaAs(111) surface that was cleaned by ion heat treatment and post-anneal. The film surfaces were examined in situ by low-energy electron diffraction (LEED) and ex situ by reflection high-energy electron diffraction (RHEED) and Nomarski optical microscopy. Capacitance-voltage (C-V) and current-voltage (I-V) measurements showed a breakdown strength of 2×106 V/cm and no significant flat-band shift due to insulator charges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336825
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    FMR in evaporated single and multilayer thin Fe films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5760-5762 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used ferromagnetic resonance (FMR) at 33 GHz to study the properties of a number of evaporated thin Fe film systems. Values for effective anisotropy field HKeff , g value, and exchange constant A were derived. For Fe on glass, ||HKeff || was found to increase with increasing thickness. These changes were attributed to stress which decreased with film thickness. The presence of a Cu or a Ti underlayer did not seem to affect HKeff for films grown at room temperature. However, Fe/Ti/glass films made at higher substrate temperatures, Ts, did show an increase in ||HKeff ||. The appearance of a spin-wave mode in the Fe films enables us to compute the exchange constant A for Fe, A=(2.12±0.14)×10−6 ergs cm−1. The coupling between two thin Fe films through an intervening Cu layer was investigated. A model predicting the number and position of the peaks in the spectrum as a function of coupling is presented. From experiment it was observed that the coupling remains almost constant through the 50–5-nm Cu thickness range but rises sharply at 2-nm Cu thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342250
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Wide range magnetic electron spectrograph (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1233-1238 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An electron spectrograph is described that covers electron energies from 400 eV to 200 keV with an energy resolution of 10%. This overlaps the range of electrostatic deflection devices at low energy and solid state detectors at high energy. The spectrograph uses magnetic deflection of the electrons to achieve energy separation and images the full range of energies on a single plane. The magnetic circuit uses the fringing field of two axially located magnets to attain the large energy range. Six separate electron beams can be dispersed in the field, each entering the circuit from a different angle. This is a particular advantage when measuring plasma electron three-dimensional velocity distributions. The angular response of the instrument is particularly favorable and the stray magnetic field is sufficiently low to meet spacecraft requirements. Compared with electrostatic deflection devices, the spectrograph is particularly advantageous for measuring high energy electron plasma velocity distribution functions with fast time resolution at modest energy resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140296
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Cellular Basis of Allograft Rejection (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Immunological reviews 77 (1984), S. 0 
    Details
    ISSN: 1600-065X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-065X.1984.tb00723.x
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  • 6
    Electronic Resource
    Electronic Resource
    A surgical operating apparatus for fish and its use in the pinealectomy of salmonids (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 10 (1977), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A surgical operating apparatus for fish that is effective for cranial surgery is described. The fishes are secured with clamp-arms which extend against the pectoral and pelvic girdles. The head is held by a plexiglass mouthpiece, designed specifically for the fish species under investigation. The mouthpiece is also responsible for gill irrigation. The use of the apparatus for the surgical pinealectomy of salmonids is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1977.tb05133.x
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    Paper (German National Licenses)
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  • 7
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    The Use of the "Test of Everyday Writing Skills" in a College Screening Program (1980)
    Bloomington, Ill. : Periodicals Archive Online (PAO)
    Journal of Educational Research. 73:3 (1980:Jan./Feb.) 168 
    Details
    ISSN: 0022-0671
    Topics: Education
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1123-1980-073-03-000008
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  • 8
    Electronic Resource
    Electronic Resource
    Non-essential Role of the Adrenal Medulla in the Hibernation of the 13-Lined Ground Squirrel (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 656-657 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The work recorded here was initiated to obtain more information on the influence of the adrenal medullary hormones in hibernation and arousal during an entire hibernating season. Six male 13-lined ground squirrels (C. tridecemlineatus) were bilaterally adrenalectomized in July, but a remnant of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207656a0
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  • 9
    Electronic Resource
    Electronic Resource
    Hypoxic inactivation of cold-induced brown fat thermogenesis (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 1172-1173 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Chez des rats adaptés au froid, non anesthésiés, placés brièvement dans une atmosphère de 12% d'oxygène, on observer un arrêt immédiat de la thermogénèse de la graisse brune. Cet effet semble s'expliquer par l'absence d'activation par le système sympathique. L'absence d'une réaction de thermogénèse en réponse à une injection de noradrénaline chez des rats soumins au froid et dans des conditions hypoxiques plaide en faveur de cette explication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946150
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Enhanced cytolytic activity of intestinal intraepithelial lymphocytes in patients with Crohn’s disease (2000)
    Springer
    Langenbeck's archives of surgery 385 (2000), S. 218-224 
    Details
    ISSN: 1435-2451
    Keywords: Key words Crohn’s disease ; Cytolytic activity ; Inflammatory bowel disease ; Intraepithelial lymphocytes ; Natural killer cells ; T cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Background and aims: Dysfunction of the immune system with inappropriate responses of lymphocytes to various antigens has been implicated in the development of Crohn’s disease. Therefore, the functional and phenotypic characteristics of intestinal intraepithelial lymphocytes (IEL) in comparison to peripheral blood lymphocytes (PBL) were analyzed in patients with and without Crohn’s disease. Patients and methods: Six patients with Crohn’s disease and six control patients were studied. Isolated IEL and PBL were tested for cytolytic activity against the human adenocarcinoma cells DLD-1 and the human leukemia cells K562 in a 51Cr-release assay. Two-color flow cytometry was performed for phenotype analysis of isolated lymphocytes. Results: IEL from patients with Crohn’s disease showed significantly increased cytolytic activity against epithelial-derived target cells when compared with IEL from control patients. In contrast, no functional changes were detectable among PBL from patients with Crohn’s disease. IEL from patients with Crohn’s disease contained a significantly higher percentage of CD8+ lymphocytes when compared with IEL from control patients, whereas no phenotypic changes were observed among PBL. Conclusions: In Crohn’s disease, the functional and phenotypic changes of T cells are limited to lymphocytes of the intestinal mucosa. Furthermore, it is conceivable that the increased cytolytic activity of IEL contributes to the tissue damage in this disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004230050268
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