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  • 2005-2009  (2)
  • 1995-1999  (19)
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  • 1
    Digitale Medien
    Digitale Medien
    Carrier concentration and mobility in GaN epilayers on sapphire substrate studied by infrared reflection spectroscopy (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 2691-2695 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the measurement of carrier concentration and mobility of metalorganic chemical vapor deposited GaN thin films on the sapphire substrate by an infrared reflection technique. By fitting with the experimental data we obtain all the parameters of the lattice vibration oscillators and of the plasmon. From the plasmon frequency and the damping constant we have derived the carrier concentration and the electron mobility. The concentration agrees with the Hall data very well while the mobility values are smaller than that of the Hall measurement by a factor of about 0.5. We attribute such mobility lowering to the increase of scattering for the electrons coupling with the incident photons. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.371112
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  • 2
    Digitale Medien
    Digitale Medien
    High-resolution transmission electron microscopy of structural changes at and near surfaces of ZnTe crystals (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 125-128 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Structural changes on and near surfaces of ZnTe crystals were observed by the surface profile imaging method in a high-resolution transmission electron microscope (HRTEM) with 200 kV accelerating voltage. It was found that ZnO particles form under electron irradiation on surfaces originally covered with a thin amorphous layer. For amorphous coverages thicker than about 7 nm, ZnO particles were not observed. Under the ZnO particles, 2×1 and 2×2 superstructures (about 10 nm in size) were often found in the ZnTe matrix. These superstructures can be described as a metastable Zn2Te3 having a structure similar to the ordered Ga2Te3 structure. This change can be accomplished by considering the diffusion of zinc from the ZnTe matrix to the surface to form the oxide and evaporation of tellurium out of the surface, leaving behind a matrix with an altered stoichiometry. The HRTEM computer-simulated images for the proposed Zn2Te3 superstructure matched very well the experimental images. The 2×1 and 2×2 superstructures corresponded to the HRTEM images of the new Zn2Te3 structure viewed along its [211] and [100] directions, respectively. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360919
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  • 3
    Digitale Medien
    Digitale Medien
    Direct observation of vibrational modes in Hg1−xCdxTe (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 3272-3274 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The vibrational modes in Hg1−xCdxTe epitaxial films and HgTe/CdTe superlattices have been investigated by means of far-infrared (FIR) transmittance spectra at temperatures from 4.2 to 300 K. The observations were put forward in the spectral range from 20 to 350 cm−1, emphasizing the wave-number region at the low-frequency side of the reststrahlen absorption band. A series of single-phonon and two-phonon modes as well as impurities- and defects-induced vibrational modes are observed. FIR transmission seems to be a good probe for characterization of the perfection of Hg1−xCdxTe films. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116571
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  • 4
    Digitale Medien
    Digitale Medien
    Response to "Comment on ‘Phase transformation of cobalt induced by ball milling' '' [Appl. Phys. Lett. 67, 1944 (1995)] (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1945-1946 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.114577
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  • 5
    Digitale Medien
    Digitale Medien
    Phase transformation of cobalt induced by ball milling (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 308-310 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have found that phase transformation can occur in cobalt when subjected to ball milling. The two modifications of cobalt, i.e., face-center-cubic (fcc) and hexagonal close-packed (hcp) phases, which usually coexist at room temperature and are often difficult to be separated from each other, can now be easily separated by using the simple ball milling technique. The phase formation of cobalt was found to depend on the mill intensity. Under different mill intensity or different milling time, the phase transformations follow the routes of hcp+fcc→hcp, hcp+fcc→hcp→fcc+hcp, and hcp+fcc→hcp→fcc+hcp→fcc, respectively. Our results indicate that the phase formation of cobalt induced by ball milling was determined by the accumulation of structure defects. Different mill intensity may adjust the rate and level of the accumulation of defects. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.113527
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  • 6
    Digitale Medien
    Digitale Medien
    Primary urethral MALT lymphoma with high proliferation fraction (2005)
    Oxford, UK : Blackwell Science Ltd
    Histopathology 46 (2005), S. 0 
    Details
    ISSN: 1365-2559
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2559.2005.02033.x
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  • 7
    Digitale Medien
    Digitale Medien
    The coherent electron microdiffraction of a single translation domain boundary in β-Ni3Nb phase (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 32 (1999), S. 951-955 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The microdiffraction from a single translation domain boundary (TDB) in β-Ni3Nb has been recorded by using a Hitachi HF-2000 field emission gun transmission electron microscope, while high-resolution transmission electron microscopy images were used to assist the analysis. The diffraction splitting effect of a TDB is well explained by the kinematics and dynamic calculations, and complex diffraction characteristics have been studied by using dynamics simulation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889899007402
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  • 8
    Digitale Medien
    Digitale Medien
    New Developments in Instrumentation for X-ray and Neutron Fibre Diffraction Experiments (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 31 (1998), S. 758-766 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: New instrumentation has been developed for use in X-ray and neutron fibre diffraction studies to provide automated control of sample position, orientation and ambient relative humidity. A sample mount system has been constructed for the Keele fibre diffraction camera on beamline 7.2 at the Daresbury Laboratory synchrotron radiation source. This allows the sample position and orientation to be controlled remotely, without disturbing the sample environment or the detector, and permits the implementation of efficient data-collection strategies. The system can be used to record entire datasets without incurring any loss of data in the meridional region of the diffraction pattern and has also been used to record three-dimensional datasets from fibres exhibiting `double orientation'. The design incorporates a translation feature so that the effects of radiation damage during data collection can be minimized. An automated humidity control system has also been constructed and can be used in either X-ray or neutron fibre diffraction studies where the water content of samples is a critical parameter and careful control of the relative humidity of the sample environment is required. This system allows the relative humidity to be controlled according to a pre-programmed set of instructions and alleviates some of the common problems that are encountered with conventional methods that require the use of saturated salt solutions. The system is currently installed on instrument D19 at the Institut Laue–Langevin, Grenoble. Results illustrating the application of these facilities in high-angle fibre diffraction studies of DNA are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889898005287
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  • 9
    Digitale Medien
    Digitale Medien
    A Quasi-Continuum Model for Ultra-Thin Plate-Type Nano-Materials and Its Application to Bending of such Plate Structures (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1097-1102 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1097.pdf
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  • 10
    Digitale Medien
    Digitale Medien
    A high resolution electron microscopic study of the microstructure in rapidly solidified Al-Li-Cu-Mg-Zr alloys (1996)
    Springer
    Journal of materials science 31 (1996), S. 224-231 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The microstructure in rapidly solidified Al-Li-Cu-Mg-Zr alloys has been reexamined by transmission electron microscopy (TEM). The results show that the weakening intermetallic phases, e.g. hexagonal, Z, face centred cubic (f.c.c), T, and tetragonal, H, (new phase) phases, exist in alloys with relatively high contents of Mg besides the strengthening phases. The sizes of these weakening intermetallic phases are on the scale of micrometres. The newly found tetragonal H phase, having parameters of a = 2.8 nm and c = 2.4 nm, was observed to coexist with the Z phase, and has a defined orientation relationship with the Z phase. High resolution images reveal that there are planar defects and 90 ° domains in the Z phase, multiple twins in the T phase, and two well defined crystallographic orientation relationships between the Z and T phases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00355149
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