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  • 1
    ISSN: 1432-1238
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 25 (2002), S. 0 
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A brief review of the discovery of the fatigue crack growth threshold is provided with a discussion of the main variables, Kmax and ΔK, which control the threshold over the low and high load ratio ranges, respectively. The significant effect on near threshold growth rates as illustrated by Donald are shown, for an example the aluminium alloy, 2324-T39. Attention is then turned to the ‘partial closure model’ as a means of correlating near threshold fatigue crack growth rates. This seems to be the most promising model with a physical basis. For this reason, the discussion goes on to present a new theoretical analysis of the load displacement record characteristics, which should accompany ‘partial closure’ of fatigue cracks. In addition it is concluded that secondary stress effects should be explored for near threshold fatigue crack growth rates.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 25 (2002), S. 0 
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Secondary elastic crack tip stress intensity factors are defined in a convenient way consistent with the primary stress intensity factor definition. Methods of evaluation of these secondary stress intensity factors are developed. They are evaluated for example configurations with cracks. It is shown that the first secondary term may be sufficient to evaluate the effects of secondary stresses beyond the usual stress intensity factor and nominal normal stresses parallel to the crack direction.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 309 (1982), S. 185-186 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Tantalum 164 to 167, Zirconium 82 to 84 and Strontium 78 have been selectively observed at the ISOCELE-2 on-line mass separator (1) in the TaF4 +, ZrF3 + and SrF+ compound form. New isotopes have been identified:165Ta (31.0±1.5 s),164Ta (13.7±0.6 s),82Zr, (32±5 s) and78Sr (2.5±0.3 mn).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Intensive care medicine 8 (1982), S. 93-95 
    ISSN: 1432-1238
    Keywords: Intravenous nitroglycerin ; Polyvinyl chloride tubing ; Polyethylene tubing ; Polypropylene syringe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two types of intravenous nitroglycerin (NTG) perfusion sets were studied using laboratory techniques. A known concentration of NTG was placed in each of these sets, and an evaluation was made as to the dose of NTG actually received by the patient after passage of the NTG solution through the sets. Set number one consisted of a glass container and polyvinyl chloride (PVC) tubing. After passage through this set, there was a rapid and significant decrease in the NTG concentration, i.e. the dose actually received by the patient is less than the dose theoretically administered. Set number two consisted of a polypropylene syringe and polyethylene tubing. After passage through this set, there was no significant change in the NTG concentration, i.e. the patient receives the full theoretical dose.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 17 (1981), S. R151 
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International journal of fracture 1 (1965), S. 189-203 
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé On dérive l'Equation générale des champs de tension d'une pointe de fissure dans un corps anisotrope par une approximation de variable complexe. On a dévini et évalué les facteurs d' intensité de tension qui permettent la représentation concise des conditions pour l'extension d'une fissure, directement des fonctions de tension. On donne quelques solutions de problèmes à valeur limite en forme implicite et on les discute en correspondance avec les solutions analogues pour corps isotropes. On a trouvé qu'une singularité de tension élastique de l'ordre de r −1/2 (où r est la distance radiale depuis le front de la fissure) est toujours présente à la pointe d'une fissure dans un corps rectilinéairement anisotrope. Ce résultat et quelques considérations additionelles des champs de tension de la pointe d' une fissure impliquent la possibilité d'étendre les applications courantes de théories de mécanisme de fracture à la représentation de conditions de fracture de corps anisotropes avec des imperfections en forme de fissures.
    Abstract: Zusammenfassung Die aligemeinen Gleichungen für Spannungsfelder an der Spitze eines Risses in anisotropischen Körpern werden näherungsweise unter Benützung einer komplexen Variabele abgeleitet. Die Spannungsintensitätsfaktoren, die eine kurzgefasste Darstellung der Bedingungen für Rissausbreitung gestatten, werden definiert and unmittelbar aus Spannungsfunktionen bestimmt. Einige individuellen Lösungen von Grenzwert-Problemen werden in geschlossener Form gegeben and bezüglich ihrer analogen Lösungen für isotrope Körper diskutiert. Es ergibt sick, dass eine elastische Spannungssingularität der Ordnung r −1/2 an der Spitze eines Risses in einem Körper mit rectilinearischer Anisotropie immer da ist. (r ist die Radiusabstand von der Rissfront). Dieses Ergebnis, und einige weiteren Betrachtungen der Spannungsfelder an der Rissspitze weisen darauf hin, dass es möglich ist, die geläufigen Methoden der Bruchmechanik für die Darstellung von Bruchbedingungen anisotropischer Körper mit rissartigen Fehlern zu erweitern.
    Notes: Abstract The general equations for crack-tip stress fields in anisotropic bodies are derived making use of a complex variable approach. The stress-intensity-factors, which permit concise representation of the conditions for crack extension, are defined and are evaluated directly from stress functions. Some individual boundary value problem solutions are given in closed form and discussed with reference to their companion solutions for isotropic bodies. It is found that an elastic stress singularity of the order r −1/2 is always present at the crack tip in a body with rectilinear anisotropy (r being the radial distance from the crack front). This result and some additional consideration of the crack-tip stress fields imply that it is possible to extend current fracture mechanics methods to the representation of fracture conditions for anisotropic bodies with cracklike imperfections.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 14 (2002), S. 7-11 
    ISSN: 1434-601X
    Keywords: PACS. 21.10.Pc Single-particle levels and strength functions – 23.20.Lv Gamma transitions and level energies – 27.70.+q 150 ?A? 189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A high-spin level structure of the nucleus 154Tm has been established for the first time up to 6.14 MeV. The 118Sn + 40Ca reaction at 205 MeV associated with the recoil shadow method was used to identify the I π = (19)+ isomeric state at 2.74 MeV. In-beam γ-ray and conversion electron spectroscopy have been applied on the 144Sm(14N, 4n)154Tm reaction at 95 MeV to build the level scheme. The level structure of 154Tm is compared to other structures observed in N = 85 neighbouring nuclei.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1434-601X
    Keywords: PACS. 21.10.Re Collective levels – 23.20.Lv Gamma transitions and level energies – 23.20 Nx Internal conversion – 21.60.Ev Collective models – 27.60.+j 90 ≤A≤ 149
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The decay of 123Ba to 123Cs has been studied with mass-separated sources. Singles spectra of -rays, X-rays and conversion electrons as well as , , and X-e-t coincidences were recorded. A level scheme of 123Cs has been constructed including 26 new excited states and 82 transitions. The existence of a I =11/2-, T =1.7 s isomer, bandhead of the h band, is confirmed. Its excitation energy equals 156.3 keV. A new T =114 ns isomer has been established at 232 keV using the in-beam recoil catcher technique. It is assigned to the I =9/2+ bandhead of the g band. Collective bands based on the 1/2+ ground state and first 3/2+ excited state are proposed. The level structure is described in the frame of the interacting boson-fermion and core-quasiparticle coupling models.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1434-601X
    Keywords: PACS. 21.10.Pc Single-particle levels – 23.20.Lv Gamma transitions and level energies – 23.20.Nx Internal conversion and extranuclear effects – 27.70.+q 150?A?189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The decay of the T 1/2 = 420 ns isomer in 151Er has been reinvestigated. The multipolarities of the decaying transitions have been established by measuring the electron conversion coefficients. An I = 67/2- assignment is proposed for this isomer with a π[h 4 11/2 d 1 3/2 d -1 5/2] ⊗ν[f 7/2 h 9/2 h -1 11/2] configuration.
    Type of Medium: Electronic Resource
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