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  • 1
    Electronic Resource
    Electronic Resource
    Scanning positron microbeam (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 228-232 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The construction and operation of a scanning positron microbeam is reported. The positrons are obtained from a doubly remoderated positron beam with a normalized brightness-per-volt of 1.8×105 e+ s−1 cm−2 rad−2 V−1 Ci−1. The beam of 8000 e+ s−1 is brought to a 10×50 μm2 focus by a sectored lens and is scanned across a test grid. Possible applications to defect spectroscopy and the observation of small samples will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140231
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  • 2
    Electronic Resource
    Electronic Resource
    Characteristics of homoepitaxial 4H-SiC films grown on c-axis substrates offcut towards 〈11¯00〉 or 〈112¯0〉 (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2632-2634 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Substrate orientation plays a critical role in determining SiC epilayer quality, but limited work has been done to examine the effect of offcut directions on 4H-SiC epilayers. 4H-SiC epilayers were grown on substrates offcut 8° towards either the 〈11¯00〉 or the 〈112¯0〉 crystalline direction. Epilayers up to 15.5 μm thick, possessing smooth morphologies free of large-scale step bunching, were grown on both substrate orientations. Triangular defects were observed primarily on the wafer periphery, and the triangular defect density depended only on offcut angle. Atomic force microscopy analysis confirmed smooth surfaces for epilayers up to 15.5 μm thick grown on 〈11¯00〉 offcut substrates. Low-energy electron diffraction analysis of epilayers grown on substrates offcut towards 〈11¯00〉 showed an ordered surface. Nitrogen and aluminum doping were successfully obtained for epilayers grown on substrates offcut towards 〈11¯00〉, and n-type and p-type doping control were demonstrated. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123920
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  • 3
    Electronic Resource
    Electronic Resource
    A method for fabricating large-area, patterned, carbon nanotube field emitters (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2549-2551 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method for fabricating large-area patterned carbon nanotube field emitters is reported. Carbon nanotube films were prepared by first depositing and patterning a transition metal catalyst film on a substrate and then by heating the substrate in a hydrocarbon atmosphere. The catalytically grown carbon nanotube films had a high emission current density of about 100–1000 mA cm−2 at a low macroscopic electric field of 10–15 V μm−1. Electron emission from the carbon nanotube films was observed at a macroscopic electric field of 1–5 V μm−1. The I–V curve obeyed the Fowler–Nordheim (FN) relationship at low emission current density, but at high electric field, the I–V curve deviated from the FN relationship due to defects on the tip of the catalytically grown carbon nanotubes. The catalytic growth of carbon nanotubes offers an inexpensive and controllable process to produce a uniform, high density of emitters on large substrate surfaces. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123894
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  • 4
    Electronic Resource
    Electronic Resource
    Advances in Fungicide Utilization (1971)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 9 (1971), S. 363-386 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.09.090171.002051
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  • 5
    Electronic Resource
    Electronic Resource
    Azido-dithiocarbonic Acid. VII. Conductivity of the Azido-dithiocarbonate Ion1 (1934)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 56 (1934), S. 1116-1118 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01320a033
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  • 6
    Electronic Resource
    Electronic Resource
    Photoemission from magnesium and from diamond film using high intensity laser beams
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 340 (1994), S. 190-194 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-9002(94)91299-8
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  • 7
    Electronic Resource
    Electronic Resource
    Demonstration of positron re-emission microscopy using an immersion objective (1988)
    Springer
    Applied physics 46 (1988), S. 335-337 
    Details
    ISSN: 1432-0630
    Keywords: 07.80.+x ; 78.70.Bj ; 66.55.Ln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hulett et al. have suggested forming a magnified image of the positrons re-emitted from a surface having a negative positron affinity as a new kind of microscope, the positron re-emission microscope (PRM). We have built an immersion objective (cathode lens) for the PRM and obtained the first images using a Ni film back-illuminated with 5 keV positrons from a brightness enhanced slow positron beam. The magnification at the detector plane is 330x and the resolution is better than 1μm. With the addition of a projector lens the magnification and resolution should be sufficient to observe defect structures and large molecules on the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01141601
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  • 8
    Electronic Resource
    Electronic Resource
    Demonstration of positron re-emission microscopy using an immersion objective (1988)
    Springer
    Applied physics 46 (1988), S. 335-337 
    Details
    ISSN: 1432-0630
    Keywords: 07.80.+x ; 78.70.Bj ; 66.55.Ln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hulett et al. have suggested forming a magnified image of the positrons re-emitted from a surface having a negative positron affinity as a new kind of microscope, the positron re-emission microscope (PRM). We have built an immersion objective (cathode lens) for the PRM and obtained the first images using a Ni film back-illuminated with 5 keV positrons from a brightness enhanced slow positron beam. The magnification at the detector plane is 330x and the resolution is better than 1 μm. With the addition of a projector lens the magnification and resolution should be sufficient to observe defect structures and large molecules on the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01210355
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  • 9
    Electronic Resource
    Electronic Resource
    Emission im ultraroten Spektralbereich (1956)
    Springer
    Naturwissenschaften 43 (1956), S. 223-224 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00600775
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  • 10
    Electronic Resource
    Electronic Resource
    The reaction of Acridine Orange with proteoglycans in the articular cartilage of the rat (1990)
    Springer
    Journal of molecular histology 22 (1990), S. 106-112 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Acridine Orange in concentrations from 0.01% to 0.2% was added to the first fixative solution in order to stain vibratome sections and small blocks of the articular cartilage of 2 month old rats. The interterritorial matrix of the radial or deep zone (zone 3) was examined. It contained reaction products with different morphology depending on the specimens used. In vibratome sections filaments were seen arranged in a homogenous pattern and changing in size with the concentration of the dye: diluted solutions produced finer filaments than concentrated ones. In contrast, in tissue blocks the staining pattern was not altered by different concentrations of Acridine Orange. However, with increase of the distance from the surface of the specimens the size of the filaments gradually decreased and formed a finer network. Since after preincubation with chondroitin ABC lyase only minute reaction products remained, an interaction of the dye with the sulphated glycosaminoglycans of the proteoglycans in the articular cartilage is suggested. The experiments show that by using mainly monocationic monomers of Acridine Orange the proteoglycans can be stained in a more expanded state than with polycationic dye polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01885789
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