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  • 11
    Electronic Resource
    Electronic Resource
    Polarographische untersuchung einiger arzneilich verwendeter hydrazinderivate
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 13 (1967), S. 10-20 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0728(67)80086-X
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  • 12
    Electronic Resource
    Electronic Resource
    Polarographische untersuchung von spartein und einiger seiner derivate
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 6 (1963), S. 54-60 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0728(63)80117-5
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  • 13
    Electronic Resource
    Electronic Resource
    Quantitative Bestimmung von Harnstoff im harn - Spektralphotometrische Bestimmung nach dunnschichtchromatographischer abtrennung auf celluloseschichten
    Amsterdam : Elsevier
    Journal of Chromatography A 20 (1965), S. 415 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0021-9673(01)97438-2
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  • 14
    Electronic Resource
    Electronic Resource
    SIZE EFFECTS IN THE FRACTURE OF A PIPE-GRADE HIGH DENSITY POLYETHYLENE (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 20 (1997), S. 0 
    Details
    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: Abstract— The effect of specimen size on fracture toughness of a pipe-grade high density polyethylene has been examined using the J integral approach. It was found that the size requirements set up by common standards appear inadequate for this material. Measurements at low temperatures, at which a plane strain fracture toughness value could be obtained, turned out to be very effective in establishing a more appropriate size requirement for this material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1997.tb00325.x
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  • 15
    Electronic Resource
    Electronic Resource
    On the viscoelastic fracture criteria for polymers: experiments and analysis (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 1159-1167 
    Details
    ISSN: 1435-1536
    Keywords: Viscoelastricity ; polymers ; fracture ; fracture-criteria
    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 Creep deformation and fracture tests on two polymeric materials were performed at various temperatures and strain rates. The data obtained were analyzed and used to test four viscoelastic fracture criteria, based on different theoretical approaches. No definitive conclusion could be reached as to the identification of an appropriate invariant fracture parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01095055
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  • 16
    Electronic Resource
    Electronic Resource
    Components of non-elastic deformation in amorphous glassy polymers (1996)
    Springer
    Journal of materials science 31 (1996), S. 4387-4394 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Non-elastic deformation of amorphous polymers was studied from strain recovery tests. In particular, a strain recovery master curve was built, which allowed estimation of the recovery times necessary to recover the whole non-elastic deformation. On such a curve, two non-elastic deformations, one anelastic and one plastic, could be distinguished by their range of recovery time. The evolution of these two components was followed during a constant strain-rate test. This clearly showed the importance of the anelastic deformation. Finally, from a review of the properties of these two components, a consistent description of deformation and recovery processes has been proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356465
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  • 17
    Electronic Resource
    Electronic Resource
    An evaluation of double-torsion testing of polymers by visualization and recording of curved crack growth (1988)
    Springer
    Journal of materials science 23 (1988), S. 4027-4036 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The development and growth of the curved crack front in a double-torsion fracture-mechanics specimen is investigated by direct observation of crack propagation during the test. The crack front motion is analysed from a video-recording of the fracture test, and three distinct stages of crack propagation are identified. This work shows some of the requirements for the application of conventional double-torsion analysis to this test configuration: the material characteristic —critical strain energy release rate as a function of crack velocity — can be correctly obtained, provided that three steady-state conditions (static, kinematic and dynamic) are all fulfilled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01106831
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  • 18
    Electronic Resource
    Electronic Resource
    Effect of notch severity on fatigue fracture in a rubber-modified glassy polymer (1994)
    Springer
    Journal of materials science 29 (1994), S. 3071-3079 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The research concerned the effect of notch severity on the fatigue behaviour of series of rubber-modified glassy polymers, consisting of a styrene-acrylonitrile copolymer with different amounts of an olefin rubber. Tests were conducted under displacement control and two different loading conditions. Both stages of fatigue lifetimes, that is, fracture initiation and crack propagation, were examined. It was observed that the initial notch severity determines the duration of the crack-initiation stage, while crack propagation does not depend on it. The crack velocity appears to be controlled by the maximum applied stress intensity factor, and the correlation does not depend on the rubber content. The results obtained have been interpreted by considering three different zones in the specimen during the fracture process: a far-field viscoelastic continuum, a process zone and a failure zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01117622
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  • 19
    Electronic Resource
    Electronic Resource
    Experimental analysis of viscoelastic criteria for crack initiation and growth in polymers (1996)
    Springer
    International journal of fracture 81 (1996), S. 55-75 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Different viscoelastic theories have been applied to characterize the resistance to crack initiation and propagation in the fracture of two poly-diethyleneglicol-bis-allyl-carbonate grades that have different crosslinking densities. Tensile creep compliance curves have been obtained on unnotched specimens, and fracture tests have been conducted on single edge notched specimens loaded in tension at different temperatures and displacement rates. A theory developed by Schapery for linearly viscoelastic materials has been found to be fairly adequate to describe the experimental results obtained, provided that the hypothesis of the yield stress being constant with time is removed. The time-temperature equivalence has also been found to satisfactorily account for the temperature dependence of the fracture resistance at initiation; however, the same did not hold as good for propagation. A simple scheme to analyse fracture data obtained from viscoelastic materials is also proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020755
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  • 20
    Electronic Resource
    Electronic Resource
    Zur Resorption von Fluor (1965)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 213 (1965), S. 31-38 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The excretion of fluorine ions in urine and faeces of adults and children has been examined by micro-analytical methods. Sodium fluoride, fluorine salts and fluorine containing tablets, either commercially available or self-made, have been applied for that purpose. The fluorine was bound to hydroxyl apatite, distilled off as H2F2 or H2SiF6 and determined colorimetrically by means of peroxotitanium(IV) sulphate solution. Certain concentrations of TiO2SO4 and H2SO4 yielded a maximum of sensitivity of the method. The excretion in the urine of 24 hrs. proved to be strictly proportional to the amount applied. After some days of continuous application a saturation ocurred, practically the whole quantity of fluorine applied being excreted in the urine. Furthermore, detailed studies have been carried out on the resorption and retention of fluorine in the body.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00516107
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