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  • 1990-1994  (3)
  • 1985-1989
  • 1994  (3)
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  • 1990-1994  (3)
  • 1985-1989
Year
  • 1
    Electronic Resource
    Electronic Resource
    Nanolithography with an atomic force microscope for integrated fabrication of quantum electronic devices (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1775-1777 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a novel technique using an atomic force microscope (AFM) for integrated nanometer-scale lithography on various mask materials such as photoresist or gold covering a mesa-etched GaAs-AlGaAs heterostructure at ambient conditions. The generated patterns can be transferred to the two-dimensional electron gas by wet chemical etching or by ion beam irradiation. We succeed in fabricating hole arrays with a periodicity down to 35 nm and a hole diameter of only a few nanometers. In magnetoresistance studies on so-called antidot devices with 95 nm period at T=4.2 K we can clearly observe commensurability oscillations, demonstrating the successful pattern transfer to the electron system. With the AFM we can also pattern lines of varying width and depth into prefabricated devices. © 1994 American Institue of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112914
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Scarless human fetal skin repair is intrinsic to the fetal fibroblast and occurs in the absence of an inflammatory response (1994)
    Oxford, UK : Blackwell Science
    Wound repair and regeneration 2 (1994), S. 0 
    Details
    ISSN: 1524-475X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The fetus heals skin wounds without scar formation. Human fetal skin that is transplanted to a subcutaneous location on an adult athymic mouse and subsequently wounded heals without scar formation, whereas the same skin heals with scar formation when transplanted to a cutaneous location. In situ hybridization with species-specific DNA probes and immunohistochemistry were performed to characterize the healing process of human fetal skin in these two locations. Species-specific human and mouse DNA probes were constructed and used to probe graft wounds under high stringency in situ hybridization conditions. Immunostaining for species-specific fibroblasts, macrophages, and neutrophils was also performed. We found that the cutaneous human fetal grafts healed with scar and showed an influx of mouse fibroblasts and macrophages. In contrast, subcutaneous human fetal grafts showed exclusively human fetal fibroblasts in the wound environment, an absence of inflammatory cells, and scar-free repair. We conclude that the highly organized collagen deposition in scarless human fetal wound repair appears to be intrinsic to the human fetal fibroblasts and occurs in the absence of an adult-like inflammatory response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1524-475X.1994.20411.x
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  • 3
    Electronic Resource
    Electronic Resource
    The binary system of BN-Mg3N2 under high pressures and temperatures (1994)
    Springer
    Journal of materials science 29 (1994), S. 6616-6619 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The phase relations in the binary system of BN-Mg3N2 were investigated in regions of pressure, P, from 3.0 GPa to 8.0 GPa and temperature, T, up to 1900 K by means of in situ differential thermal analysis (DTA) and X-ray diffraction (XRD) of the quenched products. It was found that the succession in formation of the intermediate compounds Mg3BN3 (HP-phase) and Mg3B2N4 depends on the molar ratios of hexagonal boron nitride (hBN) and Mg3N2 and on the P-T conditions. In the P-T region of cubic boron nitride (cBN) growth, the system has three metastable eutectics such as Mg3N2-hBN, Mg3BN3-hBN and Mg3B2N4-hBN. It was found that eutectic temperatures are pressure dependent. The difference in the lower-temperature limits of cBN growth regions is explained by cBN crystallization from different eutectic melts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354030
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    Paper (German National Licenses)
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