ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Electronic Resource

The fracture energy of hybrid carbon and glass fibre composites (1978)

Kirk, J. N. ; Munro, M. ; Beaumont, P. W. R.

Springer

Journal of materials science 13 (1978), S. 2197-2204

add to mindlist on the mindlist

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 fracture energy of a model carbon fibre/glass fibre/epoxy resin hybrid composite system has been evaluated as a function of the carbon fibre/glass fibre ratio. Work of fracture measurements were less than a rule of mixtures prediction and a pronounced negative synergistic effect was observed at high carbon fibre and high glass fibre contents. Fibre debonded lengths and fibre pull-out lengths for the carbon and glass fibres were accurately measured using a projection microscope technique. Models of microscopic fracture behaviour, together with these measurements, were successful in quantitatively describing the observed fracture behaviour of the hybrid fibrous composites. It was found that post-debond friction energy provided a major contribution to the fracture energy of the glass fibres. The post debond sliding mechanism was also shown to be primarily responsible for the non-linear behaviour of the work of fracture of the hybrid composite.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00541674

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

2

Electronic Resource

The elevated-temperature dependence of fracture energy mechanisms of hybrid carbon-glass fibre reinforced composites (1988)

Munro, M. ; Lai, C. P. Z.

Springer

Journal of materials science 23 (1988), S. 3129-3136

add to mindlist on the mindlist

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 fracture energy of a model hybrid carbon-glass-epoxy resin composite system has been evaluated at room temperature and three elevated temperatures. Values of the work of fracture increased with temperature and glass fibre content with an especially dramatic increase for the high temperature-high glass fibre content specimens. Evaluation of existing microstructural fracture energy mechanisms of fibre debonding, post-debond sliding and fibre pull-out were successful in quantitatively accounting for the work of fracture at room temperature. For the elevated-temperature tests of glass fibres in epoxy resin, it was shown that extensive frictional energy of the nature of the post-debond sliding mechanism is also dissipated after fibre failure.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00551284

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

3

Electronic Resource

Vesicular-arbuscular mycorrhizal fungi induced alteration in poplar root system morphology (1992)

Hooker, J. E. ; Munro, M. ; Atkinson, D.

Springer

Plant and soil 145 (1992), S. 207-214

add to mindlist on the mindlist

Details

ISSN: 1573-5036

Keywords: image analysis ; nutrient ; root morphology ; VA mycorrhizal fungi

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Poplar was grown in a soil either inoculated with Scutellispora calospora, Glomus sp E3 or Glomus caledonium or to which a nutrient solution had been added, in order to determine effects on root morphology. Plants were harvested after 115 days. The lengths of individual roots were measured using image analysis and percentage colonisation was determined for different root orders. Colonisation did not affect plant size but induced large changes in root morphology, with lengths of individual secondary and tertiary roots increased in some cases by up to 100%. Root branching was also increased with number of laterals per unit length of colonised roots being up to 6 times greater than in non-colonised roots. These results clearly show that colonisation of roots by Vesicular-arbuscular mycorrhizal fungi can result in significant alteration to poplar root system morphology. They also suggest that the mechanisms of alteration are not entirely due to improved host plant nutrition.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00010349

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

4

Unknown

Cryptic diversity in Hipposideros commersoni sensu stricto (Chiroptera: Hipposideridae) in the western portion of Madagascar (2015)

Andrinajoro Rakotoarivelo; Sandi Willows-Munro; M. Schoeman; Jennifer Lamb; Steven Goodman

BioMed Central

In: BMC Evolutionary Biology

add to mindlist on the mindlist

Details

Publication Date: 2015-10-31

Description: Background: The Commerson’s leaf-nosed bat, Hipposideros commersoni sensu stricto, is endemic to Madagascar and is relatively common in the western portion of the island, where it is found in areas, including forested zones, from sea level to 1325 m. A previous study on morphological patterns of geographic variation within the species highlighted the presence of two distinct morphotypes; larger individuals in the north portion of the island and smaller individuals in the south. The main aim of this study was to use a combination of craniodental morphology and molecular data (mitochondrial and nuclear) to test previous hypotheses based on morphology and clarify the evolutionary history of the species group. Methods: We sequenced mitochondrial and nuclear genes from Hipposideros commersoni obtained from the western portion of Madagascar, and compared them with other African species as outgroups. We analyzed the sequence data using Maximum Likelihood and Bayesian phylogenetic inference. Divergence dates were estimated using Bayesian molecular clock approach. Variation in craniodental variables was also assessed from sequenced individuals. Results: The molecular analyses suggest that H. commersoni is not monophyletic, with strong support for the presence of several independently evolving lineages. Two individuals amongst those sequenced from Isalo (south central) and Itampolo (southwest) form a separate clade (Clade A), distinct from other H. commersoni, and sister to continental African H. vittatus and H. gigas. Within the H. commersoni clade, the molecular data support two geographically distributed clades; one from the south (Clade B) and the other from the north (Clade C), which diverged approximately 3.38 million years ago. Morphometric data were consistent with the molecular analyses, suggesting a north–south break within H. commersoni. However, at some localities, animals from both clades occurred in sympatry and these individuals could not be differentiated based on external and craniodental measurements. Conclusions: Using a combination of molecular and morphological characters, this study presents evidence of cryptic diversity in H. commersoni on Madagascar. Further fine-scale phylogeographic studies are needed to fully resolve the systematics of H. commersoni. This study highlights the utility of the combined approach in employing both morphological and molecular data to provide insights into the evolutionary history of Malagasy population currently assigned to H. commersoni.

Electronic ISSN: 1471-2148

Topics: Biology