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  • Digitale Medien  (31)
  • 1990-1994  (25)
  • 1980-1984  (6)
  • 1
    Digitale Medien
    Digitale Medien
    Raman spectroscopic and chromatographic study of the uranium isotope effect in uranyl acetate complex formation (1982)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 1015-1018 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100395a036
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  • 2
    Digitale Medien
    Digitale Medien
    Magnetic properties of fine crystalline Fe–P–C–Cu–X alloys : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6241-6243 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The crystallization process and magnetic properties of Fe–P–C–Cu–Ge–Si amorphous alloys were investigated. After annealing above the crystallization temperature, the bcc Fe particles, with nanoscale grain size, precipitated in the amorphous alloy for a wide P concentration range. The volume ratio of the bcc Fe phase to amorphous was about 30%. The mixed phase of these alloys shows a drastic decrease of coercive force (Hc) and particle diameter (d) as P concentration increases. The lowest Hc was obtained for Fe78P16C2Cu0.5Ge3Si0.5, and Hc and d were 1.8 A/m and 16 nm, respectively. Observation by in situ Lorentz scanning electron microscopy (SEM) revealed that the width of magnetic domains were 0.01 or 0.1 mm and the domain walls with smaller bcc Fe particles moved in a weaker magnetic field than those with larger ones. So the low Hc is attributed to the decrease of magnetocrystalline anisotropy caused by fine structures. The core loss of fine crystalline Fe–P–C–Cu–Si–Mo alloy, W14/50, was 0.22 W/kg after annealing under a magnetic field of 2.4 kA/m.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350008
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  • 3
    Digitale Medien
    Digitale Medien
    Supermodulus effect in a Au/Ni superlattice studied by a diamond anvil cell and SR x ray : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1035-1038 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Elastic and thermal properties of Au/Ni superlattices have been investigated by x-ray diffraction on a synchrotron radiation source at the Photon Factory. An elastic response of [Au(10 A(ring))/Ni(10 A(ring))]50 to hydrostatic pressure generated by a diamond anvil cell has been measured in the layer-stacking direction. Its compressibility obtained from the pressure dependence of its superlattice period (Λ vs P) shows an anomalously small value compared with either bulk Au or Ni metal. Linear thermal expansions has also been measured by a similar method (Λ vs T). A significant anisotropic behavior between the layer-stacking and in-plane direction was found in both [Au(10 A(ring))/Ni(10 A(ring))]50 and [Au(4 A(ring))/Ni(4 A(ring))]210.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143192
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  • 4
    Digitale Medien
    Digitale Medien
    Structural characterization of a CuO/MgO artificially superstructured film by the x-ray diffraction method (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1952-1955 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A CuO/MgO epitaxial artificially superstructured film [CuO(50 A(ring))/MgO(40 A(ring))]40 was successfully grown and its structure was studied by x-ray diffraction (XRD). The film was found to have a texture in which the (111) planes of monoclinic CuO and the (001) planes of cubic MgO were layered perpendicular to the film plane. Its lateral structure was revealed by precession photographs where the CuO [101¯] axis is oriented approximately along the MgO [100] axis in the film plane. The XRD pattern, observed over a wide range of scattering vectors perpendicular to the film plane, was carefully analyzed by an extended step model. The fluctuation of the superlattice period was estimated to be as small as 1 A(ring).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356343
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  • 5
    Digitale Medien
    Digitale Medien
    Application of an imaging plate to high-pressure x-ray study with a diamond anvil cell (invited) : Proceedings of the 4th International Conference on Synchrotron Radiation Instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 967-973 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: In order to obtain reliable data on d values and integrated intensities, an imaging plate (IP) has been applied to high-pressure diffraction experiments with a diamond anvil cell using synchrotron radiation. The IP was found to be more effective than a conventional x-ray film by a factor of 30, and more effective than an energy dispersive method by several times. In order to integrate the intensity data on the IP, a histogram method was successfully developed. This combination proved to give a lattice constant with relative accuracy of 2×10−4, and observed integrated intensities which excellently agree with calculated ones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143793
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  • 6
    Digitale Medien
    Digitale Medien
    Extremely-low-threshold and high-temperature operation in a photopumped ZnSe/ZnSSe blue laser (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1401-1403 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A ZnSe/ZnSSe blue semiconductor laser was demonstrated to show very low threshold by direct photopumping of the ZnSe active layer. The lowest threshold at the excitation wavelength of 445 nm was 10 kW/cm2 at 300 K which is equivalent to the current density of 3.6 kA/cm2. This is the lowest threshold ever reported in II-VI photopumped lasers and is approaching the theoretically calculated threshold. The characteristic temperature of the threshold, which characterizes the temperature dependence of the threshold in the exponential form, was 124 K up to the measured 400 K and was comparable to III-V double-heterostructure lasers. The differential quantum efficiency remained the similar level up to 400 K and its decrease observed at 400 K was within 23% of the efficiency at 300 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.105319
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  • 7
    Digitale Medien
    Digitale Medien
    The resolution function of a perfect-crystal three-axis X-ray spectrometer (1983)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 38-46 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The resolution function of a three-axis, X-ray spectrometer is considered for the case when the monochromator and analyser crystals are ideally perfect. It is shown that, for X-ray sources which produce either an ill-collimated monochromatic beam (conventional source) or a well-collimated white beam (synchrotron radiation), the resolution problem may be simplified. This simplification allows the profile of an arbitrary section of the resolution function to be expressed as a one-dimensional integral of the product of three functions; one to represent the source characteristics and the other two to describe the Darwin profiles of the monochromator and analyser crystals. The formalism is extended to describe the measurement of the resolution function by a perfect crystal mounted on the sample table of the spectrometer. Comparison of the a priori calculations with measurements made on a spectrometer at a conventional source yields very good agreement.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108767383000070
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  • 8
    Digitale Medien
    Digitale Medien
    The application of a position-sensitive detector to high-pressure X-ray diffraction using a diamond-anvil cell (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 284-289 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: A position-sensitive detector (PSD) for Mo Kα radiation has been successfully applied to detect very weak X-rays diffracted from an extremely small volume of specimen compressed in a diamond-anvil high-pressure cell. The PSD can cover a scattering-angle range of 22.6° with an angular resolution of 0.038: in a single measurement. Remarkably rapid recording of diffraction patterns with a high S/N ratio is performed with this method at pressures higher than 10 GPa. Some diffraction patterns of iodine near the insulator-metal transition around 16–18 GPa are shown to demonstrate the usefulness and power of this PSD system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889880012071
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  • 9
    Digitale Medien
    Digitale Medien
    Multicriterion optimization using interval analysis (1990)
    Springer
    Computing 44 (1990), S. 47-57 
    Details
    ISSN: 1436-5057
    Schlagwort(e): 65G10 ; 65K10 ; Interval analysis ; multicriterion optimization ; multiobjective optimization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Bei der Bestimmung des globalen Optimums werden in der Vektoroptimierung intervallanalytische Methoden angewendet. Hier diskutieren wir Optimierungsprobleme, bei denen mehrere Zielfunktionen in Konfliktsituationen optimiert werden müssen.
    Notizen: Abstract Interval Analysis methods have been applied for obtaining the global optimum of the multimodal multivariable functions. We discuss here the multicriterion optimization problem, where several objective functions must be optimized in conflicting situations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02247964
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  • 10
    Digitale Medien
    Digitale Medien
    Muscarinic cholinoceptors mediate neurally evoked pigment aggregation in glass catfish melanophores (1982)
    Springer
    Journal of neural transmission 54 (1982), S. 29-39 
    Details
    ISSN: 1435-1463
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Sympathetic innervation to the melanophores of a siluroidParasilurus has been the sole instance of such innervation among lower vertebrates, in which the peripheral transmission to the effector cells is peculiarly cholinergic (Fujii andMiyashita, 1976). In an effort to find a similar case, we studied the nature of transmission to melanophores of a glass catfishKryptopterus. Electrical nervous stimulation brought about melanosome aggregation in the melanophores. While catecholamines were found ineffective, acetylcholine and its analogues were potently active in aggregating pigment. Atropine or scopolamine interferred with the action of both nervous stimulation and acetylcholine. Physostigmine, on the other hand, augmented the cholinergic effects. The conclusion was that the transmission was cholinergic, being mediated by cholinoceptors of muscarinic type, as in the case ofParasilurus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01249276
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