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  • Springer  (19)
  • 1995-1999  (9)
  • 1930-1934  (6)
  • 1910-1914  (2)
  • 1900-1904  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Gas-sensor properties of SnO2 films implanted with gold and iron ions (1997)
    Springer
    Journal of materials science 8 (1997), S. 301-306 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract SnO2 gas-sensor films were modified by implantation of gold and iron ions. The change in electrical resistivity of the films caused by inflammable gases, H2, CO, CH4 and C2H5OH, was measured in the temperature range 100–500°C, and compared to non-implanted films. The morphological changes caused by gold and iron ion implantation were also investigated by atomic force microscopy. After ion implantation and annealing at 600°C, the sensitivity to H2 and CO gas was found to increase, and the dynamic range of the sensitivity to ethanol was improved. The sensitivity to CH4 was low before and after ion implantation. Fe2O3 (3%SnO2) film was also modified by gold ion implantation for comparison.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018535322380
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  • 2
    Electronic Resource
    Electronic Resource
    Growth of anchorage-dependent mammalian cells on microstructures and microperforated silicon membranes (1996)
    Springer
    Journal of materials science 7 (1996), S. 85-97 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Anchorage-dependent cells (mouse fibroblasts L929 and 3T3) were cultivated on microstructures made by semiconductor technology. Both cell lines showed normal growth on silicon surfaces covered with microelectrode arrays as well as on microperforated silicon membranes with square pores made by anisotropic etching (5, 10 or 20 μm edge length at the top and 1.2, 6.2 or 16.2 μm at the bottom). The cells spread over the 5 and 10 μm pores, but mostly failed to cover the 20 μm ones. They were able to cross the silicon membrane through the pores and to grow and spread on the under side of the membrane. Small pores (about 1 μm2) impeded but did not prevent cells crossing the membrane. Medium and large pores were freely crossed. Negative dielectrophoresis was used to achieve accurate positioning of cells above pores or to repel them from the chip surface (a.c., square wave, 2.5 V peak-to-peak, 5 MHz). The results are discussed with respect to their microtool applications for single-cell technologies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058719
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  • 3
    Electronic Resource
    Electronic Resource
    Separation of the reaction products of cyanazine and terbuthylazine nitrosation by thin-layer chromatography (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 679-682 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract N-Nitroso-triazine herbicide species were synthesized as reference standards and their reaction products were separated by TLC. The method was established for analytical as well as for preparative amounts to achieve a sufficient separation between the educts, the byproducts and the N-nitrosated moieties. Separation of the reaction mixture was performed by two-dimensional TLC, using different mobile phases for each dimension. In the second dimension two developments were executed using the same solvent mixture. To examine the quality of performance, the separation zones were scrapped off, extracted and analyzed in the HPLC-diode array detection (DAD) mode in comparison with standards of the educts and the products of their N-nitrosation. This method minimizes the contact with the resulting N-nitroso compounds. At present nothing is known about the toxicological relevance or risk assessment on human health of N-nitrosocyanazine or N-nitrosoterbuthylazine species. Therefore the practical handling of these putative mutagenic and carcinogenic substances should be seen under the aspect of precaution and prevention of contamination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050780
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  • 4
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Beobachtungen über die Wanderung der Emissionssubstanz auf Oxydkathoden (1934)
    Springer
    The European physical journal 87 (1934), S. 686-686 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333335
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  • 5
    Electronic Resource
    Electronic Resource
    Temperaturmessungen im Wechselstrom-Kohlelichtbogen (1933)
    Springer
    The European physical journal 81 (1933), S. 539-542 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Die Methode von Frl. Kohn, mit Hilfe der Spektrallinienuinkehr die Temperatur eines Gasvolumens zu bestimmen, wird auf den Lichtbogen angewandt und es wird mit ihr die Temperatur des Wechselstromlichtbogens im Spannungs-Nulldurchgang gemessen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01342300
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  • 6
    Electronic Resource
    Electronic Resource
    Elektronenmikroskopische Beobachtungen über die Wanderung der Emissionssubstanz auf Oxydkathoden (1933)
    Springer
    The European physical journal 86 (1933), S. 697-709 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es werden Versuche zur Deutung der „Bildumkehr“ elektronenoptischer Emissionsbilder durchgeführt. Dabei ist unter „Bildumkehr“ zu verstehen, daß auf Oxydkathoden, in deren Belag ein Strichsystem geritzt ist, einmal die oxydbedeckte Fläche und nach der „Umkehr“ das Strichsystem stärker emittiert. 1. Die „Bildumkehr“ ist sowohl im elektrischen als auch im magnetischen Elektronenmikroskop nachweisbar. 2. Die „Bildumkehr“ wird nicht durch Verzerrungen des elektrischen Feldes an der Oberfläche einer unebenen Kathode bedingt, sondern ist, wie an einer ebenen Kathode gezeigt werden kann, durch Emissionsänderungen auf der Kathode selbst verursacht. 3. Als Ursache für die „Bildumkehr“ wird die Überdampfung der Emissionssubstanz in das Strichsystem hinein gefunden. Die Wanderung von Bariummetall wird an mehreren Kathoden gezeigt. 4. Die gewonnenen Anschauungen über die „Bildumkehr“ werden dadurch bestätigt, daß sich durch geeignete Wahl der Versuchsbedingungen die Umkehr der Emission willkürlich leiten läßt. 5. Die beobachteten Erscheinungen und die gegebene Deutung stehen mit den neueren Anschauungen über die Bedeutung des metallischen Bariums für die Emission der Oxydkathoden im Einklang. Damit ist eine weitere Stütze dieser Auffassung mit Hilfe des Elektronenmikroskops gefunden worden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01337873
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  • 7
    Electronic Resource
    Electronic Resource
    Zum Nachweise der Perborsäure und einiger ähnlicher Verbindungen (1911)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 50 (1911), S. 537-544 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01359306
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic structure of Fe−Si−Al films implanted with Al and N ions (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 190 (1995), S. 299-313 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Changes in the magnetic structure of Fe−Si−Al films due to Al and N ion implantation were studied by57Fe Conversion Electron Mössbauer Spectrometry (CEMS). The peaks of the magnetic sextets due to the crystalline films became broader by implantation with 5×1016 Al/cm2, suggesting the formation of amorphous phases. In the CEM spectrum of one sample with large grains implanted with 1×1017 Al/cm2 a crystalline α-Fe phase appeared. N implantation with the same dose did not amorphize the sample but the components with high magnetic hyperfine fields were enhanced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040005
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation of Fe-Mg-Alloys Produced by Ion Implantation (1998)
    Springer
    Hyperfine interactions 112 (1998), S. 165-168 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Iron and magnesium are insoluble elements with each other and there is no phase diagram. However, it is possible to produce artificial alloys by ion implantation, in this study by iron implantation into magnesium. Samples are investigated by conversion electron Moessbauer spectroscopy, Auger electron spectroscopy and x-ray diffraction. While at low doses gaussian shaped iron profiles and paramagnetic doublets as Mössbauer spectra are obtained, the iron concentration reaches at the highest dose 90 at.-% in maximum and the Mössbauer spectrum shows a dominant ferromagnetic fraction. The x-ray diffraction pattern let conclude that a dilated α-iron lattice is formed. Microhardness of all samples is clearly increased due to the implantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1011021618496
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  • 10
    Electronic Resource
    Electronic Resource
    Alloying by high dose ion implantation of iron into magnesium and aluminium (1998)
    Springer
    Hyperfine interactions 113 (1998), S. 391-401 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Alloys of the systems Fe–Al (mixable over the whole concentration range) and Fe–Mg (insoluble with each other) were produced by implantation of Fe ions into Al and Mg, respectively. The implantation energy was 200 keV and the ion doses ranged from 1 × 1014 to 9 × 1017cm-2The obtained implantation profiles were determined by Auger electron spectroscopy depth profiling. Maximum iron concentrations reached were up to 60 at.% for implantation into Al and 94 at.% for implantation into Mg. Phase analysis of the implanted layers was performed by conversion electron Mössbauer spectroscopy and X‐ray diffraction. For implantation into Mg, two different kinds of Mössbauer spectra were obtained: at low doses paramagnetic doublets indicating at least two different iron sites and at high doses a dominant ferromagnetic six‐line‐pattern with a small paramagnetic fraction. The X‐ray diffraction pattern concluded that in the latter case a dilated αiron lattice is formed. For implantation into Al, the Mössbauer spectra were doublet structures very similar to those obtained at amorphous Fe–Al alloys produced by rapid quenching methods. They also indicated at least two different main iron environments. For the highest implanted sample a ferromagnetic six‐line‐pattern with magnetic field values close to those of Fe3Al appeared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012648321780
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