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  • 1990-1994  (6)
  • 1960-1964
  • 1890-1899
  • 1993  (6)
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  • 1990-1994  (6)
  • 1960-1964
  • 1890-1899
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Raman studies of the growth mechanism of ZnSe/GaAs(001) heterostructures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3916-3920 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Monocrystalline ZnSe/GaAs(001) heterostructures have been grown by atomic layer epitaxy with typical thicknesses up to 200 nm. The 1LO Raman spectrum of ZnSe and GaAs, respectively, was recorded in situ during growth interruptions. The spectra were analyzed with respect to Raman intensity, phonon frequency, and bandwidth. Two different growth modes are distinguishable: (i) The biaxial compressive strain in the epilayers is increased in the thickness range up to 40 nm due to lattice mismatch of the heterosystem. This can be interpreted as a transition from an initial 3D island to the 2D layer by layer growth. (ii) When larger thicknesses (40–170 nm) are reached the strain is constant and the 1LO Raman intensity from the epilayer and from the substrate oscillates significantly with thickness. These periodic oscillations are quantitatively described in the framework of interference-enhanced Raman scattering and verify the 2D growth mode in this thickness range. The crystalline quality and the final thickness of the samples were determined by transmission electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354490
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    7Ni-O chemical interaction and the transition temperature of Ni-doped Bi2Sr2Ca1Cu2O8 (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 562-564 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We find that even very low Ni doping levels of high-quality Bi2Sr2Ca1Cu2O8 single crystals strongly affect the transition temperature Tc. We also observed that Tc is not related to the total Ni concentration, but only to that of Ni engaged in NiO-type bonds. By controlling the temperature during crystal growth, one can modify the relative weight of Ni in NiO-type bonds with respect to other configurations—and therefore Tc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110004
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of misoriented substrates and dislocations on the diffraction patterns of superlattices (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 26 (1993), S. 532-538 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The structures of superlattices on misoriented (001) substrates are described by means of two modified models. From both models, it can be concluded that there is an intensity distribution rod in the reciprocal space perpendicular to the surface and the symmetry of the diffraction pattern is reduced from tetragonal to monoclinic. However, in the first model the diffraction pattern near the substrate reflections and in the second model that near the so-called `average lattice' reflections remains tetragonal. Neglection of both of these facts can cause systematic errors in the determination of the lattice parameters of superlattices. These errors are estimated. Additionally, 60° misfit dislocations are discussed as a reason for the tilt of the layer system with respect to the substrate. The validity of the theoretical predictions was proved by X-ray diffraction studies on symmetric and asymmetric reflections on three GaAs/Ga1 − xInxAs superlattices grown on (001) GaAs. The first sample has a large misorientation and the diffraction behaviour corresponds to the above-mentioned models. The second sample shows a diffraction pattern that can be explained by a tilt of the layer system in relation to the substrate. The third sample has a large misorientation and a large tilt of the layer system and so its diffraction pattern shows an overlap of both effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889893000305
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Precocious puberty due to a lipid-cell tumour of the ovary (1993)
    Springer
    European journal of pediatrics 152 (1993), S. 12-14 
    Details
    ISSN: 1432-1076
    Keywords: Precocious puberty ; Ovarian neoplasm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 4-year-old girl with a lipid cell tumour of the ovary showed isosexual precocious pseudopuberty. The endocrine activity of the tumour led to elevated plasma levels of dehydroepiandrosterone sulphate, oestradiol, testosterone and androstenedione. After tumour resection the clinical signs of abnormal hormonal stimulation disappeared within 10 months. The girl developed precocious puberty again 2 years later without any sign of relapse. Therapy with luteinizing hormone releasing hormone agonist was effective although premature activation of the hypothalamic-pituitary-gonadal axis could not clearly be demonstrated by hormonal investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072508
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Radiologically-guided catheter drainage of intrathoracic abscesses and empyemas (1993)
    Springer
    European radiology 3 (1993), S. 366-370 
    Details
    ISSN: 1432-1084
    Keywords: Percutaneous drainage ; Radiologic guidance ; Pleural emyemas/abscesses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Radiologically guided percutaneous catheter drainage was used in 38 patients to treat pleural empyemas (35 patients) and pulmonary abscesses (3 patients). Drainage was successful in 85.7% of empyemas including 11 cases with fistulous communications. Three percutaneously drained pulmonary abscesses required subsequent lobectomy. One patient died during the drainage procedure due to sepsis. No major complications related to the drainage procedure were observed. Guided percutaneous drainage proved to be a safe and successful alternative to closed drainage of pleural fluid collections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167471
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Far-infrared and mid-infrared absorption in (Bi,Pb)-Sr-(Ca,Y)-Cu-O (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 251-263 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The reflectivities of seven films belonging to the Bi-Sr-Ca-Cu-O family, with Tc ranging from 60 to 95 K, and of a single crystal of insulating Bi-Sr-Y-Cu-O, have been measured at room temperature in the normal phase. The optical conductivity has been analyzed in terms of Drude (D), mid-infrared (MIR), and charge-transfer (CT) contributions. As Tc increases, the spectral weight within the charge-transfer gap (D+MIR) increases. Meanwhile, the peak frequency of the MIR band moves towards the far-infrared and the optical conductivity becomes more similar to that of a “normal” metal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02282068
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    Paper (German National Licenses)
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