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  • 1
    ISSN: 1615-6110
    Keywords: Angiosperms ; Leguminosae ; Mimosoideae ; Acacia terminalis ; Bee- and bird-pollination ; extrafloral nectaries ; intraspecific variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intraspecific variation has been found for several pollination-related characteristics in two isolated populations of the self-incompatible treeAcacia terminalis: floral characteristics including colour and flowering time; style length; size and colour of extrafloral nectaries on the leaf petioles; chemical components of the extrafloral nectar; different taxa of bee pollinators; and frequency differences in bird pollinators. These differences possibly reflect the evolution of two different pollination syndromes within this species.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 24 (1989), S. 4246-4252 
    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 Five FeAl alloys, whose compositions span the range 34 to 51 at. % Al, were extruded at 1273 K, re-extruded at 1023 K and their deformation structures examined by transmission electron microscopy. The incidence of 〈1 1 1〉 slip, compared with 〈001〉 slip, was found to increase as Fe-Al became more iron-rich, confirming previous results, in a similar study: some of the 〈1 1 1〉 dislocations were found to be present in the form of dipoles. In the most aluminium-rich alloy square 〈0 0 1〉 prismatic dislocation loops, planar defects and FeAl2 particles were observed.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Aequationes mathematicae 14 (1976), S. 244-245 
    ISSN: 1420-8903
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Aequationes mathematicae 14 (1976), S. 461-472 
    ISSN: 1420-8903
    Keywords: Primary 30A20, 30A46, 39A20 ; Secondary 30A30, 30A66
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (1984), S. 1799-1804 
    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 Annealing studies of cold-rolled Ni3Al established that the recrystallization kinetics obey the Avrami equation and that the grain-growth kinetics obey the relation ¯d=Ct n where ¯d is the average grain size, t the time and C and n are parameters whose magnitude depends on temperature. Disorder is introduced during deformation but subsequently removed during recrystallization. Antiphase boundaries are found in some recrystallized grains but do not show any preference to lie on {100} planes, contrary to predictions based on Flinn's nearest-neighbour approximation model. Twins, dislocation networks an planar faults are also found in recrystallized grains.
    Type of Medium: Electronic Resource
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  • 6
    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 Rapidly solidified powders of stoichiometric Ni3Al and Ni3Al containing boron and titanium have each been consolidated by two distinct routes, namely hot extrusion or hot compaction. The resulting microstructures have been examined by optical microscopy, scanning electron microscopy and transmission electron microscopy. The consolidated material did not retain the non-equilibrium structure of the rapidly solidified powders. The addition of titanium and boron produced material with a larger final grain size, a decreased incidence of twinning and, in the extruded material, led to cracking. Although all processing was performed in inert atmospheres, oxides were present in all consolidated products.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 26 (1991), S. 4303-4306 
    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 Room temperature tensile testing of the B2-structured compound Pd-52 at% In produced, a yield strength of 50 MPa, a fracture strength of 130 MPa, and limited tensile ductility (∼3%). Examination, in the transmission electron microscope, of the deformed microstructure indicated that it deforms by 〈001〉 {100} slip. Extra reflections and streaking were observed in selected area electron diffraction patterns, which appear to be a thin foil effect.
    Type of Medium: Electronic Resource
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  • 8
    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 White-beam synchrotron X-ray topography has been used to image dislocations and grain boundaries in high-purity columnar-grained polycrystalline ice. It was found that screw, 30° and 60° basal dislocations with 〈 1 1 ¯2 0 〉 Burgers vectors far outnumber other dislocations: near free surfaces, the dislocations were bent because of image forces. Circular prismatic dislocation loops with [0 0 0 1] Burgers vectors and dipoles were also found. These probably formed due to thermal shock. In one sample, the dislocation structures of three grains were clearly observed simultaneously, although no dislocations were visible in the boundaries.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 29 (1994), S. 742-748 
    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 Ingots of three FeCo alloys, Fe-70 at % Co, e-50 at % Co and Fe-30% Co, were successfully extruded at 1000°C, then re-extruded at 750°C in order to produce fine-grained material. The resulting microstructures were examined both optically and by transmission electron microscopy. It was found that increasing the Fe: Co ratio produces less complete recrystallization: Fe-70 at % Co was completely recrystallized even after both the 1000 and 750°C extrusions, whilst Fe-30 at % Co was partially recrstallized after the 1000 °C extrusion. Single dislocations were present in the extruded alloys except single-extruded Fe-30 at % Co, in which dislocation pairs were observed.
    Type of Medium: Electronic Resource
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  • 10
    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 mechanical behaviour of the multi-phase (β′ + γ/γ′) alloy Ni-20 at % Al-30 at % Fe and alloys similar to its constituent β′ and γ/γ′ phases, Ni-30 at % Al-20 at % Fe and Ni-12 at % Al-40 at % Fe, respectively, were investigated. When tested in tension at 300 K, the alloys exhibited ≈ 20%, 2% and 28% elongation, respectively. At elevated test temperatures (700, 900 and 1100 K), the multi-phase alloy exhibited increased ductility, reaching an elongation in excess of 70% at 1100 K without necking or fracture. Similarly, the β′ alloy demonstrated increased ductility with increasing test temperatures. In contrast, the γ/γ′ alloy showed greatly reduced ductility with increasing temperature and was quite brittle both at 900 and 1100 K. Thus, whilst at room temperature the γ/γ′ phase improved the ductility of the β′ + γ/γ′ aggregate, at elevated temperatures the β′ phase alleviated the brittleness of the γ/γ′ phase, thereby preventing any embrittlement of the multi-phase alloy over the temperature range 300–1100 K. Also, whilst the β′ phase improved the room-temperature strength of the multi-phase alloy, at elevated temperatures where the β′ phase is known to be weak, the γ/γ′ phase improved the strength of the multi-phase alloy up to 900 K, beyond which the strength deteriorated due to disordering and lack of anomalous strengthening in the γ/γ′ component.
    Type of Medium: Electronic Resource
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