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  • 11
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The topography of the funnel-canal organs of Carcinus maenas (Decapoda, Crustacea) and their stimulus-receiving cuticular and sensory apparatus were studied in the light and electron microscopes. About 4000 funnel-canal organs are situated within the exoskeleton of Carcinus. Almost all of them are on the distal segments of the walking legs, in particular on the epicuticular cap at the tip of the dactyl. They were not found to be arranged in groups or sensilla fields, and no sex-specific differences were observed. Characteristic features of the funnel-canal organs are as follows: (a) There is a terminal pore (0.5×0.8 μm diameter) in the cuticle, at the tip of a small projection. It is closed by a plug of electron-dense material. (b) The terminal sections of the dendrites are enclosed in a dendritic sheath up to ca. 10 μm below the pore. (c) The dendrites, 3–24 in number, end below the plug; none of the dendrites exhibits a tubular body; two of the dendrites are distinguished from the others by the greater number of microtubules in their outer segments. The structural characteristics, in particular the “gustatory pore” and the number of dendrites, are typical of bimodal receptors in arthropods. In such receptors, as in the contact chemoreceptors of insects and arachnids, mechano-and chemosensitive sensory cells are combined. This interpretation of the function of the funnel-canal organs is supported by electrophysiological data of other authors. The morphological parameters we find for the funnelcanal organs, in comparison with those of insect campaniform sensilla, provide clear evidence against the reclassification of the funnel-canal organs as “crustacean campaniform organs” proposed by Shelton and Laverack (1968).
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 616-621 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Vergrabene Nitridschichten in Silicium werden durch Hochdosis-Ionenimplantation hergestellt und auf ihre Eignung als Kalibriermaterial für die quantitative Dünnschichtanalyse geprüft. Dafür werden N+-Ionen (150 und 300 keV; 0,35–1·1018 N+ cm−2) in Si-Einkristallen implantiert und durch Temperung (1200°C, bis 15 h) formiert. Die mit AES/Sputtering erhaltenen Signalintensitäten als Funktion der Sputterzeit können mit Hilfe unabhängiger Kalibriermessungen in die Stickstoffgehalte als Funktion der Probentiefe transformiert werden. Die Tiefenzuordnung wird durch AES-Mikroanalyse an Schrägschliffen (〈1°) und durch Vergleich mit Monte-Carlo-Simulation mit einer Genauigkeit von ca. 30 nm bei 0,3 μm Profiltiefe erhalten. Der Stickstoffgehalt wird mittels der gemessenen Implantationsdosis bestimmt. Weitere zusätzliche Bestimmungsmethoden werden diskutiert. Es zeigt sich, daß die beschriebenen Proben als Kalibriermaterial für das Stoffsystem Silicium/Stickstoff geeignet sind.
    Notes: Summary Buried layers of silicon nitride in silicon are produced by high-dose ion implantation and are checked for their suitability as calibration samples for quantitative thin film analysis. For this purpose, N+ ions (150 and 300 keV; 0.35 to 1×1018 N+ cm−2) are implanted into silicon single crystals and the samples annealed at 1,200°C for up to 15 h. The signal intensities and the sputter time obtained by AES/ sputtering can be converted into nitrogen content and sample depth by means of independent calibration measurements. The absolute depth scale is obtained by AES microanalysis at angle lapped surfaces (angle 〈1°) and by comparison with Monte Carlo simulation. The accuracy obtained is about 30 nm at a profile depth of 0.3 μm. The nitrogen content is determined quantitatively by means of the measured implantation dose. Additional methods of calibration are discussed. It is shown that the samples used are suitable as calibration samples for the silicon/nitrogen system.
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Pharmacy world & science 1 (1979), S. 1443-1450 
    ISSN: 1573-739X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Für die Kompressionsgleichung (s − a) (p + b) = C wurden die drei Hyperbelkonstanten a, b, und C interpretiert und ihre Abhängigkeit vom Mischungsverhältnis zweier Substanzen untersucht. Die Grö\e b wurde als Verformungsspannung bezeichnet, sie kann mit der Flie\grenze eines Materials in Beziehung gesetzt werden. In einer Tablettenrezeptur kann der Anteil an verformtem Arzneistoff mit Hilfe der Konstanten b abgeschätzt werden.
    Notes: Abstract The three hyperbolic constants a, b and C were interpreted for the compression equation (s − a) (p + b) = C. Their dependence upon the mixture ratio of two substances was investigated. The quantity b was designated as deformation strain, it can be related to the yield point of a material. The proportion of deformed drug in a tablet formulation can be estimated by means of the constant b.
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  • 14
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 6 (1980), S. 85-91 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 2-point functions of local gauge invariant baryonic operators in QCD are continued from the Euclidean to the hadronic region using the Migdal regularization procedure to orders α s . The knowledge of the anomalous dimensions of baryonic operators allows to derive the mass spectrum of the leading δ- and of the first twoN-resonances.
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 25 (1984), S. 45-48 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Instantons infinitesimally turned out of theSU c (3) subspace of spontaneously brokenSU(5) gauge theory induce a baryon number violating interaction proportional 1/μ X 2 like heavy vector boson exchange, but with a different tensor structure.
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 54 (1984), S. 93-97 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recently photochemical holeburning experiments have been carried out in organic glasses down to 0.4 K. Here we give a theoretical explanation of theT 1.3-dependence of the holewidth. It is based on the strain field coupling between impurity molecules and two-level tunneling states leading to a kind of “spectral diffusion” of the optical excitation energy.
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 298 (1980), S. 249-252 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Selective laser excitation was used to measure the radiative lifetimes of the ZnI triplet states 4sns 3 S 1(n=5–7) and 4snd 3 D 3,3 D 2 and3 D 1(n=4–6). These states were excited from the metastable 4s4p 3 P states, which were collisionally populated in an atomic beam. The values are compared with the results of other experimental methods (beam-foil, pulsed electron excitation, Hanle effect) and with theoretical calculations. The corresponding oscillator strengths are discussed with respect to the astrophysical determination of the Zn photospheric abundance.
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  • 20
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The controlled evaporation of a heated tungsten wire was used to produce an atomic beam of tungsten. The atoms were excited selectively by the radiation of a pulsed dye laser. Time-resolved observation of the reemitted fluorescence with single-photon-counting technique yielded the lifetimes of 13 levels in the configuration (5d+6s)5 6p.
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