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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Archiv der Mathematik 74 (2000), S. 6-10 
    ISSN: 1420-8938
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract. The known bound for the index of nilpotency of a finitely generated nil ring of bounded index is improved and the new bound is applied to obtain other bounds for indices of nilpotency and nility.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Foundations of physics 13 (2000), S. 101-103 
    ISSN: 1572-9524
    Schlagwort(e): force-free effects ; interferometry ; phase shifts
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We describe a force-free phase shift due only to temporal geometric boundary conditions placed on a neutron de Broglie wave packet.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1434-601X
    Schlagwort(e): PACS. 25.80.Ls Pion inclusive scettering and absorption
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The absorption of π+ on Ar was studied at pion energies of 70, 118, 162, 239 and 330MeV, and on N and Xe at 239MeV. Twenty-six absorption reaction channels with at least two energetic charged particles in the final state have been evaluated. Partial cross-sections have been determined according to the number of protons, neutrons and deuterons in the final state.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1434-601X
    Schlagwort(e): PACS. 21.10.Ky Electromagnetic moments – 27.30.+t 20 ≤ A ≤ 38 – 76.60.-k Nuclear magnetic resonance and relaxation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The nuclear electric quadrupole moments of the isotopes 26Na, 27Na, 28Na and 29Na were measured by -NMR spectroscopy in single crystals of LiNbO3 and NaNO3. High degrees of nuclear polarization were produced by optical pumping of the sodium atoms in a fast beam with a collinear laser beam. The polarized nuclei were implanted into the crystals and NMR signals were observed in the -decay asymmetries. Preparatory measurements also yielded improved values for the magnetic moments of 27-31Na and confirmed the spin I=3/2 for 31Na. The results are discussed in comparison with large-basis shell model calculations.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Rechtsmedizin 10 (2000), S. 61-64 
    ISSN: 1434-5196
    Schlagwort(e): Schlüsselwörter Dentalamalgame ; Eingrenzung der Leichenliegezeit ; Röntgen-Mikroanalyse ; Key words Dental amalgam ; Delimitation of postmortem period ; X-ray Microanalysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin , Rechtswissenschaft
    Beschreibung / Inhaltsverzeichnis: Summary The composition of amalgam used as dental filling material has undergone many changes since it was first introducted by Adolf Witzel 100 years ago in Germany. Using the X-ray microanalysis EDAX allows a qualitative and quantitative determination of the metals in the alloy. The quantitative evaluation of the components makes it possible to classify the alloy into specific amalgam types. Changing definitions (such as specification No. 1 by the FDI) and quality regulations (such as the use of gamma-2-free amalgams) of new types of dental amalgams were made at various time periods and can therefore be used as an approximate time indicator. Such analyses are possible even with small volumes of material. Metallographic investigations support this analytical process and make the identification of the amalgam product possible. However, a more substantial amount of material is necessary for a metallographic investigation. These methods were tested on human remains and it can be concluded that they contribute to a delimination of the postmortem period.
    Notizen: Zusammenfassung Die Zusammensetzung der Amalgame als Füllungswerkstoff in der Zahnheilkunde hat sich seit der Einführung durch Adolf Witzel in Deutschland vor ca. 100 Jahren in der Zusammensetzung mehrfach geändert. Mittels der Röntgen-Mikroanalyse EDAX können die Metalle in der Legierung sowohl qualitativ als auch quantitativ bestimmt werden. Durch die quantitative Bestimmung der einzelnen Legierungsbestandteile ist die Zuordnung zu bestimmten Amalgamtypen möglich. Da die unterschiedlichen Legierungstypen auf Grund von Beschlüssen, wie z. B. der FDI Spezifikation Nr. 1 und veränderten Qualitätsanforderungen, z. B. gamma-2-freie Amalgame, zu unterschiedlichen Zeitpunkten eingeführt wurden, wird dadurch eine grobe zeitliche Eingrenzung möglich. Metallographische Strukturuntersuchungen unterstützen das analytische Verfahren und lassen gegebenenfalls Rückschlüsse auf das Fabrikat zu. Diese Untersuchungsmethoden, die an aktuellen Skelettfunden getestet wurden, können bei der Eingrenzung der Leichenliegezeit hilfreich sein.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Archives of orthopaedic and trauma surgery 120 (2000), S. 183-187 
    ISSN: 1434-3916
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract To improve the technique of intraoperative sonography of the spinal canal, a teaching model of the thoracolumbar spine was developed. It allows to simulate the typical spinal stenosis of a vertebral fracture and the sonographic procedure to detect and measure such a lesion. Moreover, partial laminectomy and modification of a fixateur interne set-up, which are preconditions for successful sonography, can be simulated. Independent of the surgical qualification, a high precision in sonographic localisation and measurement of the spinal canal stenosis was achieved by the training. The results could be validated in the cadaveric model. Thus, sonographic expertise acquired with the teaching model proved to be reliable in the clinical situation.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    ISSN: 1862-0760
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Cu was locally deintercalated from intercalated 1T TaSe2 and 1T TiSe2 single crystals by applying a voltage pulse between the sample surface and an atomic force microscope (AFM) tip under ambient conditions. Using this method, clusters with diameters of approximately 60 nm were grown. This would allow the use of intercalated transition metal dichalcogenides as mass-storage devices. The intercalated samples were prepared in ultrahigh vacuum (UHV) and characterised by X-ray as well as ultraviolet photoelectron spectroscopy (XPS, UPS). It is shown that the preparation of metal-free surfaces requires prolonged heating steps.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Experiments using laser spectroscopy and nuclear magnetic resonance techniques have been performed at ISOLDE on the unstable isotopes of several light elements. The results include nuclear ground state spins, magnetic dipole and electric quadrupole moments, and the behaviour of mean square nuclear charge radii within isotopic strings. These give important information about the nuclear structure at shell closures and close to the drip lines.
    Materialart: Digitale Medien
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