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  • 1
    Electronic Resource
    Electronic Resource
    MODE II STABLE CRACK GROWTH (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 19 (1996), 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 Mode II stable crack extension has been examined for an aircraft grade aluminium alloy D16AT. Both theoretical and experimental results are presented. The experimental observations include load displacement diagrams, plastic wake, crack front tunnelling and scanning electron micrographs of the fracture surfaces. The crack shows a tendency for in-plane extension, and the fracture surface is very flat, smooth and free of any dimples. The crack front advances with neghgible tunnelling at all stages of extension. The span of mode II stable crack growth (SCG) is longer than in the case of mode I SCG reported earlier for the same material and there is also more extensive plastic deformation. In the presence of a slight mode I load, the crack grows out-of-plane and the fractured surface facets resemble that of a mode I or mixed-mode dimpled fracture. The theoretical study is based on a finite element analysis using small deformation theory and incremental plasticity. Some of the experimental results have been theoretically predicted using the COA criterion as the governing criterion. The theoretical results include load-displacement diagrams, crack edge displacement curves, plastic zones and the J resistance curves. There is good agreement between the load-displacement diagrams. The initiation and maximum loads differ by less than 15%. The J resistance curve has a constant slope over the whole span of stable crack growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1996.tb00933.x
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  • 2
    Electronic Resource
    Electronic Resource
    MODE I AND MIXED-MODE STABLE CRACK EXTENSIONS THROUGH STIFFENED THREE-POINT BEND SPECIMENS (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 18 (1995), 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 Both experimental and theoretical results on stable crack extensions are presented for symmetrically stiffened and unstiffened three point bend specimens subjected to mode I or mixed mode loading systems. Results concerning load-displacement variation, growth of plastic zones, instantaneous crack edge profiles, tunnelling, etc., are presented. There is good agreement between the experimental and theoretical results. The whole of stable crack growth can be characterized by the crack opening angle criterion. The stiffening helps to increase substantially both the initiation load and the maximum fracture load.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1995.tb00888.x
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  • 3
    Electronic Resource
    Electronic Resource
    (Z)-N-Benzyl-2,3-dihydro-2-(2-methoxybenzylidene)-4H-1,4-benzoxazine (1999)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 1154-1156 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270199003340
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  • 4
    Electronic Resource
    Electronic Resource
    4-Benzoyl-2-chloro-6-phenylpyrimidine (1999)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 2186-2188 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270199011865
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  • 5
    Electronic Resource
    Electronic Resource
    Boundary element method based computation of stress intensity factor by modified crack closure integral (1997)
    Springer
    Computational mechanics 19 (1997), S. 203-210 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The local smoothing scheme in conjunction with the modified crack closure integral technique has been adopted in the boundary element method to improve the accuracy of computed stress intensity factors. Simple relations have been derived for the case of linear, quadratic and quarter point elements around the crack tip. Case studies are presented to demonstrate improvement in the accuracy. While the displacement method gives a difference with the standard handbook solution up to 26%, the suggested method helps to reduce it to within 2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050169
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  • 6
    Electronic Resource
    Electronic Resource
    Vorticity- and shear-free space-time in general relativity (1984)
    Springer
    General relativity and gravitation 16 (1984), S. 297-303 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper studies the vorticity- and shear-free nonstatic space-times with perfect fluid source in genera] relativity and finds that such space-times are either spherically symmetric or pseudospherical or plane symmetric.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00762544
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  • 7
    Electronic Resource
    Electronic Resource
    Viscous fluid in static spherically symmetric space-time (1983)
    Springer
    International journal of theoretical physics 22 (1983), S. 363-368 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper presents a static spherically symmetric viscous fluid solution of Einstein field equation, assuming an equation of statep=(γ−1)ρ. Though static, the solution has expansion, shear, and acceleration and can explain cosmological red shift. Also it has a particle horizon. The singularity at the origin and larger viscosity make it unfit to represent a real universe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02082902
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Syntheses of pure (9Z, 11Z), (9E, 11E), (9E, 11Z), and (9Z,11E)-9,11-hexadecadienals-possible candidate pheromones (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 795-807 
    Details
    ISSN: 1573-1561
    Keywords: (9z,11Z) ; (9E.11E) ; (9E,11Z) ; (9Z,11E)-9 ; 11-Hexadecadienals ; (9E)-hexadecen-11-yn-1-yl acetate ; syntheses ; aldehydes ; ester ; conjugated dienes ; dienals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The title compounds were prepared by six different routes, and recommendations are given for the more convenient procedures in laboratory-scale syntheses. Modifications in the literature preparations of the 9E,11E and 9E,11Z isomers are described. Baseline separation of a prepared mixture of all four isomers of the (9Z, 11Z), (9E, 11E), (9E, 11Z), and (9Z, 11E)-9,11-hexadecadienals was achieved using GC methods with standard capillary columns. [13C]NMR spectroscopy of the alkene carbon atoms clearly differentiates between theZ,Z, E,E and eitherE,Z orZ,E isomers of the precursor dienols and thus of the dienals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988544
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  • 9
    Electronic Resource
    Electronic Resource
    Outcrossing and isolation requirement in kenaf (Hibiscus cannabinus L.) (1981)
    Springer
    Euphytica 30 (1981), S. 739-745 
    Details
    ISSN: 1573-5060
    Keywords: Hibiscus cannabinus ; kenaf ; outcrossing ; contamination ; isolation distance ; planting design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary To find the isolation distance in Hibiscus cannabinus L. (kenaf), experiments were conducted for three years with two planting designs. The extent of cross pollination irrespective of the planting designs was inversely related with the distance. At a distance beyond 10.0 m, the contamination was found to be absent. Directions had no influence on the contamination. The amount of contamination varied considerably between the years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00038803
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  • 10
    Electronic Resource
    Electronic Resource
    Outcrossing and isolation requirement in jute (Corchorus olitorius L.) (1982)
    Springer
    Euphytica 31 (1982), S. 97-101 
    Details
    ISSN: 1573-5060
    Keywords: Corchorus olitorius ; jute ; outcrossing ; isolation distance ; planting designs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary To find out an effective isolation distance in olitorius jute experiments were conducted for three years in two planting designs; in one the cultivar with the dominant marker allele was planted at the centre and the cultivarcarrying the recessive marker allele was planted around and in the other the planting arrangement was just the reverse of the former. A total of nearly 20 lac seedlings were counted. Irrespective of the planting designs, at the minimum distance from the pollen source outcrossing was found to be at its maximum which, however, decreased with the distance. Directions had no influence on cross pollination in this species. At a distance beyond 9.0 metres outcrossing was found to be absent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028311
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