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  • 2000-2004  (2)
  • 1995-1999  (2)
  • 1980-1984  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Nanospot welding of carbon nanotubes (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1169-1171 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Single wall carbon nanotube (SWNT) bundles protruding from the SWNT layers on self-aligned Sn apexes were brought to a distance of 30 nm by a scanning tunneling microscope inside a transmission electron microscope. A straight bundle on the tip could be observed in situ in contact electrostatically with a looped bundle on the sample by applying tip bias voltages above 2.0 V. The bundles were welded at the nanometer size contact area by local Joule heating. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1395535
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  • 2
    Digitale Medien
    Digitale Medien
    Room-temperature operation at 333 nm of Al0.03Ga0.97N/Al0.25Ga0.75N quantum-well light-emitting diodes with Mg-doped superlattice layers (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 175-177 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We demonstrate room-temperature deep ultraviolet (UV) current injection emission from Al0.03Ga0.97N/Al0.25Ga0.75N multiquantum-well (MQW) light-emitting diodes (LEDs) fabricated by metalorganic vapor phase epitaxy. The electroluminescence (EL) peaked at 333.0 nm under pulsed current injection. To our knowledge, this is the shortest wavelength ever reported for nitride QW LEDs. A Mg-doped GaN/AlGaN superlattice (SL) hole conductive layer was used as a p-type layer in order to enable current injection into such deep-level AlGaN QWs. We observed single-peak near band-edge emission from the QWs. The output intensity did not saturate up to current densities of 0.33 kA/cm2. We obtained a reasonable well width dependence on the EL peak wavelength of Al0.01Ga0.99N MQW LEDs, which confirms that the main emission peak originates from the QW regions. These results revealed that the Mg-doped SL hole conductive layers are highly suitable for application to GaN-based UV light-emitting devices. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.126915
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  • 3
    Digitale Medien
    Digitale Medien
    Growth of a single-wall carbon nanotube in the gap of scanning tunneling microscope (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2450-2452 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Single-wall carbon nanotubes (SWNTs) were grown in the tunneling gap of a scanning tunneling microscope (STM). We could observe their growth processes in situ by operating the STM in a transmission electron microscope. The STM tip and sample were covered by graphite layers. The tip was lightly touched to the sample and subsequently retracted. Occasionally, a carbon nanobridge was generated between the tip and the sample. The bridge had the shape of SWNT at the tip side. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.123877
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  • 4
    Digitale Medien
    Digitale Medien
    Linear systems analysis of kinetic behaviors of calcium ion channel gating on the biological membrane by an allosteric model (1999)
    Springer
    Computational mechanics 24 (1999), S. 71-81 
    Details
    ISSN: 1432-0924
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Linear system analysis was applied to calcium channel gating on the biological membrane. The conformational changes of calcium channel gating were expressed by an allosteric enzyme model composed of four subunits with corresponding voltage sensor molecules. The rate constants for the channel states transitions were obtained from reported biological experiments and simulation. The linear system analysis disclosed that the system is unstable and uncontrollable. Combinations of each input site and output of the channel gating state for the impulse responses and the singular values of the system showed that the potency of any particular input site for evoking impulse responses at any particular channel state and singular value is not equivalent among the channel states but favor for large numbers of voltage sensors and open channel states. Allosteric effects for modifying the concerted cooperative properties of the calcium channel have a significant influence on the singular values of the system. System optimization improved the system properties of the calcium channel and will be available for evaluating the economical channel gating of the biological membrane and artificial membrane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004660050439
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  • 5
    Digitale Medien
    Digitale Medien
    A finite element method for contact problems related to fracture mechanics (1984)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 20 (1984), S. 2175-2195 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: A finite element method for contact problems in crack mechanics is developed on the basis of the penalty function method. The method is successfully applied to three important problems in fracture mechanics: a crack propagated from a pin hole, a two-point supported specimen with an edge crack loaded by a stamp, and a thick plate with a through-wall crack under bending force.
    Zusätzliches Material: 24 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620201203
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