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  • Articles: DFG German National Licenses  (26)
  • 1995-1999  (26)
  • 1990-1994
  • 1985-1989
  • 1999  (26)
  • 1
    Electronic Resource
    Electronic Resource
    Fine structure of boron nitride nanotubes produced from carbon nanotubes by a substitution reaction (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 2364-2366 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Here we report on the precise structural investigation of multiwalled boron nitride (BN) nanotubes by means of high-resolution transmission electron microscopy and electron energy loss spectroscopy. The nanotubes were produced from carbon nanotubes by applying a recently discovered technique: a substitution chemical reaction [W. Han, Y. Bando, K. Kurashima, and T. Sato, Appl. Phys. Lett. 73, 3085 (1998)]. It is found that in contrast to the starting carbon nanotubes, which exhibited large number of shells (typically 〉10), a significant proportion of buckled and corrugated graphene-like sheets, poor degree of graphitization, and wide distribution of helicities, the resultant BN nanotubes revealed perfectly straight shapes, limited number of shells (typically 2–6), and remarkable ordering of the graphene-like sheets in the so-called nonhelical "zig-zag" fashion with the [101¯0] direction parallel to the tube axis. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371058
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  • 2
    Electronic Resource
    Electronic Resource
    Modeling of magnetic island formation in magnetic reconnection experiment (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1253-1257 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Formation of a magnetic island found in the Magnetic Reconnection Experiment (MRX) [M. Yamada, H. Ji, S. Hsu, et al., Phys. Plasmas 4, 1936 (1997)] is investigated by a magnetohydrodynamic (MHD) relaxation theory and a numerical simulation. In the cohelicity injection with a mean toroidal field, the growing process of the island into a spheromak-type configuration is explained by quasistatic transition of the force-free and minimum energy state to a state with larger normalized helicity. It also turns out that no magnetic island would be generated in the counterhelicity case. The MHD simulation with inhomogeneous electric resistivity agrees with experimental results, which clearly shows formation and growth of the magnetic island in a diffusion region where the reconnection takes place. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873368
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of Fragrance Materials With 2-Hydroxypropyl-β-Cyclodextrin by Static and Dynamic Head-space Methods (1999)
    Dordrecht, The Netherlands : Blackwell Science Ltd
    International journal of cosmetic science 21 (1999), S. 0 
    Details
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The stability constants for the inclusion of fragrance materials with 2-hydroxypropyl-β-cyclodextrin (2HP-β-C yD) in aqueous solution have been determined by the static head-space method. The 1:1 stability constants obtained by this method were in reasonable agreement with the corresponding values in the literature. In addition, the release profiles of fragrance materials from 2HP-β-CyD aqueous solution were investigated using the dynamic head-space method. It was found that the suppression of the fragrance materials release was dependent on their stability constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1467-2494.1999.203156.x
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of photoexcited carriers in molecular beam epitaxy grown semimagnetic epilayers in magnetic fields (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5941-5943 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved photoluminescence has been measured on molecular beam epitaxy grown Cd1−xMnxTe epilayer samples. The photoluminescence intensity of magnetic polarons exhibits a very long emission tail. The observed phenomenon is attributed to the conversion of the dark excitons to dipole allowed transitions by a spin-flip process. The magnetic field dependence of the two-exponential decay property is discussed within the frame of giant Zeeman splitting, the spin-flip scattering, and the formation of the magnetic polarons. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369998
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  • 5
    Electronic Resource
    Electronic Resource
    A simple method to control tracheal cuff pressure in anaesthesia and in air evacuation (1999)
    Oxford : Blackwell Science Ltd
    Anaesthesia 54 (1999), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The pressure within latex balloons remains constant despite the balloons being inflated to more than 40 times their initial volume. We used this property to enable improved tracheal cuff pressure control. A latex balloon with an initial volume of 5 ml was connected via a vinyl duct attached with a roller clamp and three-way stopcock to a standard tracheal tube cuff. The 5 ml latex balloon was then inflated with 250 ml of air. The pressure within the tracheal tube cuff was monitored throughout anaesthesia with the inflated latex balloon acting as a pressure controller. Throat symptoms were recorded on the first four postoperative days. The controller kept the tracheal tube cuff pressures constant, and reduced the incidence of postoperative throat symptoms. Variations in cuff pressures with and without the controller were investigated in an altitude chamber to simulate flight. In the altitude chamber, cuff pressure reached over 200 cmH2O at 10 000 feet without the controller, whereas such variations were practically eliminated when the controller was used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2044.1999.01008.x
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic response of Cd0.63Mn0.37Te under illumination: Dynamic behavior of spin glass with step-like heating and cooling (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 7310-7315 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic behavior of a typical diluted magnetic semiconductor Cd0.63Mn0.37Te was investigated under the unpolarized light illumination in a magnetic field. Both the zero field cooled (ZFC) and field cooled (FC) values of magnetization in Cd0.63Mn0.37Te decrease under illumination below the spin freezing temperature. This magnetic response was explained on the basis of a change in temperature of the sample under illumination, since the intrinsic photo-induced magnetic change was less than the resolution of superconducting quantum interference device magnetometer. The transient behavior observed in the FC and ZFC values of magnetization in Cd0.63Mn0.37Te was analyzed in terms of the step-like heating and cooling induced by the optical method and it was observed that the FC magnetization showed hardly any relaxation in spite of the change in temperature below the spin freezing temperature. In addition, the analysis of ZFC magnetization indicated that two types of spins coexist in the low temperature state of Cd0.63Mn0.37Te: one belongs to the freezing spin cluster and the other shows paramagnetic behavior. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369354
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  • 7
    Electronic Resource
    Electronic Resource
    Do proteinuria and hypertension at biopsy influence long-term outcome of IgA nephropathy? (1999)
    Melbourne, Australia : Blackwell Science Asia Pty. Ltd.
    Nephrology 5 (1999), S. 0 
    Details
    ISSN: 1440-1797
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1797.1999.00092.x
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of post-drawing treatments on the fatigue strength of eutectoid steel wires (1999)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 22 (1999), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.1999.00212.x
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  • 9
    Electronic Resource
    Electronic Resource
    The effect of diabetes mellitus on histopathological changes in the tissues under denture base bearing masticatory pressure (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The effect of streptozotocin-induced diabetes mellitus on histopathological changes in tissues bearing masticatory pressure exerted through an experimental denture base has been studied in animal specimens. Experimental dentures, which prescribed the masticatory pressure by the amount of subsidence of the denture base (100, 50 or 13 μm), were constructed for the hard palate of the molar regions of rats. It was revealed that streptozotocin-induced diabetes mellitus (1) weakened the intercellular junctions in the epithelium and gradually enhanced this state with time, (2) lessened the atrophic and proliferative reactions in the epithelial ridge and prolonged their appearance period, (3) enhanced the compression of lamina propria mucosae and prolonged the appearance period of this reaction, (4) enhanced the inflammatory change and extended its appearance period, (5) lowered the threshold for the inflammatory reaction induced by the masticatory pressure, (6) increased the number of osteoclasts and prolonged the period of their presence, (7) lowered the threshold for osteoclastic bone resorption induced by the masticatory pressure, (8) inhibited the appearance of osteoblasts following the disappearance of osteoclasts and (9) accelerated the decline rate of masticatory pressure exerted to the denture supporting tissues. Therefore, it can be concluded that the streptozotocin-induced diabetes mellitus in the animals tested deteriorated the tolerance of the denture supporting tissues to masticatory pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00367.x
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of diabetes mellitus on histopathological changes in the denture-supporting tissues under continuous mechanical pressure in rat (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The histopathological changes in denture-supporting tissues of streptozotocin-induced diabetes mellitus rat were studied in relation to continuous mechanical pressure exerted through an experimental denture base. The experimental dentures were designed to load continuous mechanical pressures (3·4, 1·5 or 0·5 kPa) to the hard palate of the molar region of a rat. From the results of this study, the following conclusions were drawn: the streptozotocin-induced diabetic condition (1) tended to prolong the appearance period of a shortened epithelial ridge, and weakened the phenomenon, (2) reduced the appearance period and severity of the compression of epithelium, (3) delayed the time of manifestation of the proliferative change in the recovery process of the shortened epithelial ridge, and weakened the phenomenon, (4) prolonged the appearance period of the compressed lamina propria mucosae, and enhanced the phenomenon, (5) reduced the number of osteoclasts, (6) lowered the threshold for induction of the osteoclastic bone resorption to between 1·5 and 0·5 kPa, (7) inhibited the appearance of osteoblast which follows the disappearance of osteoclasts, (8) did not induce any inflammatory change, and (9) tended to enhance the longitudinal change of the continuous mechanical pressure. The histopathological changes in the denture-supporting tissues of the streptozotocin-induced diabetes mellitus rat related highly to the longitudinal change of the continuous mechanical pressure exerted through the denture base. From the results of this study, it was suggested that the streptozotocin-induced diabetic condition lowers the tolerance of the denture-supporting tissues to continuous mechanical pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00354.x
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