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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 3374-3376 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural analysis of the cross section of gold/Langmuir-Blodgett (LB) polymer film/gold sandwich structures was performed using transmission electron microscopy (TEM), and the obtained results were complemented by electron transport investigations of the sandwich structures. The polymer film consisted of four to ten LB monolayers of a nonconducting polymer. TEM analysis of the sandwich cross section revealed a number of gold particles, 2–5 nm in size, formed during the fabrication process within the LB film close to the top electrode. Low temperature dc-transport measurements showed current-voltage (I-V) characteristics with equidistant steps that are not expected if the polymer film is thought to form a single laterally extended tunneling barrier between the metal electrodes. This feature can be understood, however, on the basis of the Coulomb blockade model applied to cluster-like metallic inclusions acting as an island separated from both Au electrodes by tunneling barriers. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 3331-3333 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We prepared symmetric sandwich structures of the sequence gold/Langmuir–Blodgett film/gold by employing a novel evaporation technique. As molecular systems, we used an octasubstituted palladiumphthalocyanine and a perylene-3,4,9,10-tetracarboxyldiimide derivative. Electronic transport measurements show a tunneling characteristic which arises from a direct tunneling process through molecular states. The current/voltage curves are symmetric for positive and negative bias proving the identical electronic behavior of the two organic/inorganic interfaces at the top and bottom electrode. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2984-2986 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Cu on the magnetic properties of slowly cooled Nd60−xFe20Al10Co10Cux (0≤x≤10) bulk amorphous alloys has been studied by room-temperature magnetic measurements. Ferromagnetic bulk amorphous Nd60Fe20Al10Co10 cylinders of 3 mm diameter and 50 mm in length with a coercivity of 298 kA m−1 were obtained by copper mold casting. The addition of 1 at. % Cu into the Nd60Fe20Al10Co10 alloy causes an increase in coercivity to 321 kA m−1. Further addition of Cu by replacing neodymium, however, results in an abrupt decrease in coercivity to 41 kA m−1 for alloys with x=10 due to the precipitation of a Fe-rich magnetically soft Nd(Fe, Co, Al)2 phase. The improvement of the hard magnetic properties by the addition of 1 at. % Cu for the cast Nd60Fe20Al10Co10 based bulk amorphous alloys may be attributed to an enhanced clustering of Nd–(Fe, Co) pairs in the amorphous alloys. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 22 (1995), S. 0 
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Hydrogen sulphide (H2S) is a broad spectrum toxicant that occurs widely in nature and is also released by a variety of industrial activities and processes.2. The central nervous system (CNS) appears to be the major target organ.3. There is great potential for insult or injury to the developing or immature CNS.4. The risks of chronic or repeated exposures to low concentrations have not been well defined.5. Exposure to low concentrations of H2S to time-pregnant rats from day 5 postcoitus until day 21 postnatal results in architectural modification of cerebellar Purkinje cells, alteration of putative amino acid neurotransmitters and changes in monoamine levels in the developing rat brain up to day 21 postnatal.6. H2S-induced alterations in monoamine tissue levels observed in the developing rat brain return to control values if exposure is discontinued during development, that is, at day 21 postnatal.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1434-3940
    Keywords: Schlüsselwörter Mundschleimhauttransplantat ; Urethrastenosen ; Entnahmestellenmorbidität ; Mundschleimhautregeneration ; Key words Oral mucosal graft ; Urethral stricture ; Donor site morbidity ; Mucosal regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: The use of free buccal mucosal grafts in the treatment of urethral strictures has become very popular. In 1996 and 1997 we harvested free buccal mucosal grafts up to 7 cm long and 4 cm wide from 12 patients who underwent urologic surgery for urethral strictures. In 2 patients the donor site was closed primarily by sutures. Four patients received Lyodura and another 4 patients received Syspurderm as temporary wound coverage. In 2 patients Ethisorp patches were used. Donor site pain was judged by the patients on a visual analogue scale during the first postoperative week. The 2 patients who received the Ethisorp patches complained of more intense pain, probably caused by the rigidity of the material. In all patients regeneration of the donor site mucosa was good. During the follow-up period of 4–18 months scar formation at the lower vestibulum was noticed as the only complication. Permanent limitation of mouth opening, stenosis of the parotid duct or hypesthesia did not occur.
    Notes: Bei der operativen Behandlung der zumeist traumatisch bedingten bulbären Urethrastrikturen des Manns werden zunehmend Mundschleimhauttransplantate verwandt. In den Jahren 1996 und 1997 haben wir bei 12 Patienten mit langstreckigen Urethrastenosen Mundschleimhauttransplantate von bis zu 7 cm Länge und 4 cm Breite aus dem Planum buccale entnommen. Bei 2 Patienten wurde die Entnahmestelle primär verschlossen, bei jeweils 4 Patienten erfolgte die temporäre Defektdeckung mit Lyodura oder Syspurderm und bei 2 Patienten wurden die großen Schleimhautdefekte mit Ethisorp überbrückt. Die Schmerzhaftigkeit im Entnahmebezirk wurde während der ersten postoperativen Woche von den Patienten auf einer Analogskala von 1–10 beurteilt. 10 der 12 Patienten gaben geringe bis mittelgradige Schmerzen im Entnahmegebiet an. Bei den 2 Patienten, deren Entnahmestelle mit Ethisorp gedeckt wurde, lag eine stärkere Schmerzhaftigkeit vor, was in der Rigidität des Materials begründet liegen kann. Alle Patienten zeigten eine gute Schleimhautregeneration im Bereich der Entnahmestelle unabhängig vom verwendeten Material. Während der 4- bis 18monatigen Nachuntersuchungszeit wurde als einzige Komplikation eine Narbenstrangbildung zum Unterkiefervestibulum festgestellt. Mundöffnungsbehinderungen, Speichelabflußstörungen und persistierende Hypästhesien des N. mentalis und N. buccalis wurden nicht beobachtet.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 69 (1999), S. 269-274 
    ISSN: 1432-0630
    Keywords: PACS: 78.30.Na; 61.16.Ch; 81.05.Tp; 81.20.Ym
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Production methods for carbon nanotubes are now well established and allow their synthesis on a scale of grams per day. For many potential applications of this unique material, its purification still remains a crucial problem. In this article various purification methods for single- and multi-wall carbon nanotubes are reviewed. These methods are compared in terms of their capacity, efficiency, and effects on the tubes. In addition, the use of Raman spectroscopy for monitoring the chromatographic purification of single-wall nanotubes is described.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0630
    Keywords: PACS: 61.48.+c; 63.22.+m; 78.30.Na
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The pressure dependence of the high-energy Raman modes in single- and multi-walled carbon nanotubes was measured in the range 0–10 GPa. We found the pressure coefficient to be linear in both materials but 25% smaller in MWNT. Given that the curvature effects on vibrational properties of the rolled-up graphene sheets are small, we can explain this difference simply with elasticity theory.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 67 (1998), S. 591-593 
    ISSN: 1432-0630
    Keywords: PACS: 82.45.+z; 82.70.Dd; 85.65.+h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 191 (May 1995), p. 149-160 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 191 (May 1995), p. 195-206 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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