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  • Springer  (451)
  • 2000-2004  (156)
  • 1985-1989  (236)
  • 1960-1964  (57)
  • 1945-1949  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Noncontacting strain measurements at high temperatures by the digital laser speckle technique (2000)
    Springer
    Experimental mechanics 40 (2000), S. 98-105 
    Details
    ISSN: 1741-2765
    Keywords: Strain measurement ; digital speckle correlation technique ; thermal strain ; large mechanical strain ; high test temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents a newly developed laser-based noncontacting strain sensor suitable for temperatures up to 1200°C, which was adapted to a commercial tensile testing machine equipped with an electrical furnace. The principle of the strain sensor is based on tracking laser speckles through a digital correlation technique. Furthermore, the description of the signal processing and the optical arrangement is presented. Based on the experimental data, it can be show that this simple, laser-based strain sensor can be used successfully for the determination of mechanical and thermal strains up to temperatures of about 1200°C. Using a special data-processing procedure, it was feasible to minimize decorrelation effects caused by changes in the specimen surface due to, for example, slipband and microcrack formation, surface oxidation and phase transformation and, thus, measure large mechanical strains. The strain resolution for the selected setup was about 20 microstrains depending on the testing parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327556
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  • 2
    facet.materialart.
    Unknown
    Noncontacting strain measurements at high temperatures by the digital laser speckle technique (2000)
    Springer
    Details
    Publication Date: 2000-03-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Ein schnell messendes Laser-Speckle-Extensometer zur Bestimmung von statischen und dynamischen Materialparametern (2000)
    Springer
    Details
    Publication Date: 2000-04-01
    Print ISSN: 0932-383X
    Electronic ISSN: 1613-7620
    Topics: Electrical Engineering, Measurement and Control Technology , Computer Science
    Published by Springer
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Einfluß von Tetracyclinen auf den Stoffwechsel von35S-markiertem Methionin in verschiedenen Organen (1961)
    Springer
    European journal of nutrition 2 (1961), S. 109-121 
    Details
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Notes: Zusammenfassung Es wurden Versuche zum Studium des Eiweißstoffwechsels unter dem Einfluß von Antibiotika durchgeführt, die zu folgenden Ergebnissen führten: 1. Hypophysen von Küken, die unter Beigabe von Aureomyzin (80 mg/kg Futter, bzw. 10 mg/kg Körpergewicht und Tag) gefüttert waren, zeigten im in vitro Versuch gegenüber Kontrollen einen um 47,5% höheren Einbau von35S-Methionin in ihr Eiweiß (P〈0,05). Das mittlere Gewicht der Tiere der Aureomyzingruppe war von dem der Kontrollgruppe nicht signifikant verschieden. 2. Der Einbau von35S-Methionin in das Eiweiß von Leberschnitten bei Küken, die zu ihrer Grunddiät 20 mg/kg Körpergewicht und Tag an Aureomyzin erhielten, war gegenüber dem bei Kontrolltieren nicht gesteigert, obwohl das mittlere Gewicht der Versuchstiere um 7,2% höher als das der Kontrolltiere lag (P〈0,05). 3. Bei einem in vivo Versuch an Küken mit einer täglichen Zulage von 10 mg/kg Körpergewicht Oxytetrazyklin, wurden 2 Stunden nach intraperitonealer Applikation von35S-Methionin der Einbau der Markierung in das Gewebeeiweiß von Leber, Herz und Blutplasma gemessen. Das Plasmaeiweiß der Versuchstiere zeigte gegenüber den Kontrolltieren (ohne Zulage) eine signifikant höhere Inkorporation der Aminosäure (P〈0,05). Der Einbau in das Herz- und Lebereiweiß verlief bei beiden Versuchsgruppen gleich. Zwischen den Einbauraten und der täglichen Gewichtszunahme der Tiere bestehen positive Korrelationen, die mit Ausnahme der für das Herzeiweiß der Kontrollgruppe, signifikant sind. Statistisch gesicherte Unterschiede zwischen den Korrelationskoeffizienten der beiden Versuchsgruppen sind nicht vorhanden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02019143
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  • 5
    Electronic Resource
    Electronic Resource
    Coping with legacy factors (1988)
    Springer
    Engineering with computers 4 (1988), S. 11-17 
    Details
    ISSN: 1435-5663
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Implementers of engineering data base management systems inherit a legacy of existing software and data that must be integrated into the new system with minimum disruption of ongoing activities. Some critical issues addressed here include changes in software engineering practices, impact on user training and procedures, and problems connected with traditional or parochial interests. The material covered describes some experiences in coping with these “legacy factors” during the recent McDonnell Aircraft Company (MCAIR) integrated data base implementation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201468
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  • 6
    Electronic Resource
    Electronic Resource
    Amphiphilic diacetylenes with pyridine and 2,2′-bipyridine headgroups — polymerization properties in the crystalline state, in LB-multilayers, and in complexes with transition metal salts. Morphology of polymerized multilayers (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 576-586 
    Details
    ISSN: 1435-1536
    Keywords: Solid state polymerization ; diacetylene derivatives ; monomolecular layers ; Langmuir-Blodgett multilayers ; morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Synthesis, amphiphilic properties and polymerization behaviour of a variety of single and double chain esters of pyridine- and 2,2′-bipyridine-carboxylic acids containing the diacetylene moiety are described. Conversion versus60Co-γ-ray dose curves indicate significant differences in solid-state reactivity of the individual compounds. The esters of isonicotinic acid form polymers that are soluble in chloroform. The monomers can be converted into salt derivatives and transition metal complexes, some of which are characterized concerning their solid state reactivity. Esters of isonicotinic acid form stable monolayers if spread onto neutral or acidified aqueous subphases at temperatures ≤ 15 °C. These monolayers can be deposited on substrates by the Langmuir-Blodgett technique and subsequently be UV-polymerized. In addition, attempts are reported to form polymeric mono- and multilayers by spreading the soluble polymeric amphiphiles at the air-water interface and subsequently transferring the films onto substrates. The two types of polymeric films exhibit morphologies that are significantly different. Polarizing micrographs indicate a domain structure of randomly shaped crystallites of only a few micrometers in diameter for LB-monolayers built up as monomers and polymerized on the substrate. On the other hand, polymer films built up as polymers are inhomogeneous and do not actually represent monomolecular films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421891
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  • 7
    Electronic Resource
    Electronic Resource
    Chaotic laser dynamics (1988)
    Springer
    Optical and quantum electronics 20 (1988), S. 1-22 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Chaotic emission of lasers theoretically predicted long ago has only recently been experimentally verified. A review of experiments on various laser types is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069690
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  • 8
    Electronic Resource
    Electronic Resource
    Understanding heterogeneous catalysis on an atomic scale: a combined surface science and reactivity investigation for the dehydrogenation of ethylbenzene over iron oxide catalysts (2000)
    Springer
    Topics in catalysis 14 (2000), S. 111-123 
    Details
    ISSN: 1572-9028
    Keywords: metal oxides ; atomic scale surface chemistry ; TDS ; single crystal flow reactor ; high pressure ; pressure gap ; defects ; active carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In order to study the dehydrogenation of ethylbenzene to styrene, epitaxial iron oxide model catalyst films with Fe3O4(111), α-Fe2O3(0001) and KFe x O y (111) stoichiometry were prepared in single crystal quality on Pt(111). They were investigated using surface science techniques before and after atmospheric pressure reaction experiments in a newly designed single crystal flow reactor. As expected from low-pressure measurements, Fe3O4(111) is catalytically inactive. The catalytic activity of α-Fe2O3(0001) starts after an activation period of about 45 min. After that, the surface is essentially clean but shows a high concentration of defects. On the potassium-promoted films, however, the activation period is much longer, the activity then is higher and the surface gets covered completely with carbon and oxygen during reaction. This indicates a different reaction pathway on the promoted films with a carbon–oxygen species as catalytically active species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009067302464
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  • 9
    Electronic Resource
    Electronic Resource
    Earth albedo and the orbit of Lageos (1986)
    Springer
    Celestial mechanics and dynamical astronomy 38 (1986), S. 233-296 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The long-period perturbations in the orbit of Lageos satellite due to the earth's albedo have been found using a new analytical formalism. The earth is assumed to be a sphere whose surface diffusely reflects sunlight according to Lambert's law. Specular reflection is not considered. The formalism is based on spherical harmonics; it produces equations which hold regardless of whether the terminator is seen by the satellite or not. Specializing in the case of a realistic zonal albedo shows that Lageos' orbital semimajor axis changes periodically by only about a centimeter and the eccentricity by two parts in 105. The longitude of the node increases secularly by about 6×10−4 arc sec yr−1. The effect considered here can explain neither the secular decay of 1.1 mm day−1 in the semimajor axis nor the observed along-track variations in acceleration of order 2×10−12 ms−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01231110
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  • 10
    Electronic Resource
    Electronic Resource
    Incidence-polytopes of type {6, 3, 3} (1986)
    Springer
    Geometriae dedicata 20 (1986), S. 147-155 
    Details
    ISSN: 1572-9168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract From the hyperbolic honeycomb {6, 3, 3} we derive a class of abstract polytopes whose cells are isomorphic to the toroidal maps {6, 3} b,c and vertex figures to tetrahedra. We give a criterion on the finiteness of these incidence-polytopes in terms of the group PSL ± (2, ℤ[ω]), leading, among other things, to the explicit recognition of the groups in some interesting special cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00164396
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