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  • 1
    Call number: M100:396
    Edition: 1. Aufl.
    ISBN: 9783642198410
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    M100:396 departmental collection or stack – please contact the library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 234 (1970), S. 161-170 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reaction90Zr(p, p′) leading to the 1.76 MeV excited state was studied at the 6.22 MeV 5/2+ analog resonance. Excitation functions taken at 150° and 170° were analyzed in terms of Weidenmüller's theory, in order to deduce the spectroscopic factor, external spreading width and level shift in the inelastic channel. An upper limit of 3.2 keV for the internal spreading width of this resonance was set.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2303-2310 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Antimony/aluminium films in bilayer and multilayer geometries were irradiated at liquid-nitrogen temperature with 50–900 keV ion beams ranging in mass from 20Ne to 208Pb. Depth profiling of the element concentrations was carried out via Rutherford backscattering spectroscopy. The formation of intermetallic phases and phase segregation was analyzed by means of x-ray diffraction, cross-section transmission electron microscopy, and scanning electron microscopy. From the low-dose irradiation data, the mixing rates k were obtained and found to depend linearly on the energy density FD deposited at the interface. The mixing efficiency of Sb/Al bilayers, k/FD=296(30) A(ring)5/eV, supports the local thermal spike model. After high-fluence irradiations of Sb/Al bilayers with 550 keV Xe++ ions, a reacted layer of crystalline SbAl (B3 phase) at the interface was observed. Sb/Al multilayers irradiated with 900 keV Xe++ ions were found to become amorphous. Phase formation was studied as a function of the ion fluence, irradiation energy, and ion mass, and was found to start at that fluence, where cracking and shrinking of the Sb top layer and an increase of the sputtering yield were also observed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser-nitriding may be a promising technique for substituting conventional nitriding processes. We have irradiated pure iron with pulses of an excimer laser and achieved high nitrogen contents in a thin surface layer. We found that the nitrogen is dissolved into γ-Fe, leading to a large amount of retained austenite. This was also verified by X-ray diffraction (XRD) measurements. Three subspectra can be resolved in the Mössbauer spectra (CEMS) for this nitrogen austenite. The nitrogen concentration can be calculated in terms of site occupation, indicating a content as high as 16(1) at%, which is consistent with the results of Rutherford backscattering spectroscopy (RBS), resonant nuclear reaction analysis (RNRA) and Auger electron spectroscopy (AES) measurements. This is more than the solubility limit for γ-Fe(N). By reactive magnetron-sputtering it is possible to produce thin iron nitride films of various stoichiometries. We report on the production ofε-Fe x N and FeN y films. These films were again characterized by CEMS, RBS, RNRA (15N(p, αγ)) and XRD. Forε-Fe x N, produced in the range 2⩽x⩽3 with medium nitrogen flows during reactive sputtering, the Mössbauer spectra can be well resolved in terms of different iron sites, enabling an accurate calculation of the nitrogen content. For high nitrogen flows during sputtering a phase FeN y withy〉0.5 is produced. This phase is not reported in the Fe-N phase diagram.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1572-9540
    Keywords: laser nitriding ; iron nitrides ; stainless steel ; annealing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser nitriding is used for the fast and easy production of nitride coatings on iron and alloys. Here, first results of the laser nitriding process applied to stainless steel are reported. The laser treatment led to the appearance of additional lines in the Mössbauer spectra, which are attributed to γ-Fe(N) produced by the laser nitriding process. The Mössbauer results are discussed in connection with the results obtained from X-ray diffraction and resonant nuclear reaction analysis. Furthermore, the results of isochronical annealing treatments of laser nitrided iron are reported.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1572-9540
    Keywords: Magnetron Sputtering ; Iron ; Aluminum ; Intermetallic phases ; oxidation ; Mössbauer Spectroscopy ; CEMS ; RBS ; HRSEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fe-Al intermetallic alloys have been considered as protective materials against corrosion. We have studied the properties of such intermetallic coatings Fe x Al1−x (x ≤ 0.5) on the aluminum-rich side and their oxidation behaviour. The samples were prepared using rf-magnetron sputtering. The composition and layer thickness were determined by Rutherford Backscattering Spectrometry (RBS) and high-resolution scanning electron microscopy (HRSEM). Conversion Electron Mössbauer Spectroscopy (CEMS) and X-Ray Diffraction (XRD) were applied for phase analysis. We report here on the oxidation of such coatings.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1572-9540
    Keywords: laser nitriding ; iron nitrides ; CEMS ; CXMS ; RNRA ; nanoindentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of the nitrogen take‐up upon irradiation of iron or steel with excimer laser pulses in air or in nitrogen atmosphere is well established. The resulting phase compositions and nitrogen depth profiles were measured by a combination of simultaneous Conversion Electron Mössbauer Spectroscopy (CEMS), Conversion X‐ray Mössbauer Spectroscopy (CXMS), and Resonant Nuclear Reaction Analysis (RNRA) as a function of the nitrogen gas pressure during irradiation. A maximum nitrogen content and a maximum fraction of the ɛ-nitride was found at 0.1 MPa. This result is in accordance with hardness measurements performed by the nanoindentation technique.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Ni—Al bi- and multilayers were irradiated with 300-900 keV Xe ions and analysed by Rutherford backscattering spectrometry (RBS) and the perturbed gamma-ray angular correlation (PAC) method. As PAC measures the interaction of radioactive probe nuclei (111In) with hyperfine fields, it is sensitive to changes in the nearest-neighbour surrounding induced by a phase transformation. The formation of the crystalline NiAL phase during irradiation was indeed detected by PAC; it was found to start at ion fluences below that required for complete mixing of the constituents. Similar results were obtained after 600 keV Ar irradiations. The interface mixing rate in Ni—AI bilayers due to 300-600 keV Xe ions was measured with RBS to be k = 4.5(3) ×104 Å4 at room temperature.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0878
    Keywords: Key words: Interleukin-6 ; Interleukin-1β ; Tenidap ; Astrocytes ; Alzheimer’s disease ; Therapy ; Cell culture ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Tenidap is a structurally novel antirheumatic agent with anti-inflammatory and analgesic properties. Previous studies have shown that tenidap is able to inhibit the production and action of cytokines such as interleukin-1, interleukin-6 (IL-6) and tumour necrosis factor α. However, the mechanisms by which tenidap inhibits cytokine synthesis are not yet known. We investigated in the human astrocytoma cell line U373 whether tenidap inhibits IL-6 synthesis by inhibition of certain signal transduction processes leading to IL-6 synthesis. Cells were stimulated with different substances which have previously been shown to activate protein kinase A or C, reactive oxygen intermediates as well as transcription factors such as nuclear factor kappa B and AP-1 and which all result in IL-6 synthesis. Tenidap was a very potent inhibitor of IL-6 synthesis independent of the stimuli used, suggesting an inhibitory mechanism other than inhibition of a certain signal transduction pathway. Since IL-6 has been shown to be involved in the etiopathology of Alzheimer’s disease and since the use of nonsteroidal anti-inflammatory drugs appears to be of therapeutical benefit, it is concluded that tenidap should be tested in clinical trials in order to determine whether it may be useful for the treatment of Alzheimer’s disease.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 442 (2006), S. 67-70 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The classical strength profile of continents is derived from a quasi-static view of their rheological response to stress—one that does not consider dynamic interactions between brittle and ductile layers. Such interactions result in complexities of failure in the brittle–ductile transition and ...
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