| 1. |
- Porter, D.A., et al.
(författare)
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Dynamic studies of the deformation and fracture of pearlite using 200 kV SEM
- 1978
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Ingår i: Electron microscopy 1978. - Toronto : Microsopical Soc. of Canada. - 0920622062 ; , s. 578-579
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Konferensbidrag (refereegranskat)abstract
- Summary form only given, as follows. The influence of interlamellar spacing on the mechanics of deformation was studied and the materials examined ranged from coarse pearlite, with a mean interlamellar spacing λ~0.4 μm, to fine pearlite with λ~0.1 μm. The problems of ex post facto reasoning regarding the modes of deformation were avoided by continuously following deformation with the TV monitor and recording high resolution slow scan micrographs from the same area both before and after straining. The results of this investigation have shown that there are large differences in the deformation and fracture mechanisms between coarse and fine pearlites, especially when the cementite lamellae are aligned close to the tensile axis
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| 2. |
- Porter, D.A., et al.
(författare)
-
Dynamic studies of the tensile deformation and fracture of pearlite
- 1978
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Ingår i: Acta Metallurgica. - : Elsevier BV. - 0001-6160. ; 26:9, s. 1405-1422
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Tidskriftsartikel (refereegranskat)abstract
- High resolution 200 kV scanning electron microscopy has been used to study in situ the tensile deformation and fracture of a range of pearlites, from relatively coarse mean interlamellar spacing of about 400 nm, to very fine mean spacing of about 90 nm. It was found that there were considerable differences in the tensile deformation behaviour between fine and coarse pearlites. A model is proposed to account for the differences based upon a combination of pile-up and fibre loading stresses, in which the operating deformation mode is largely determined by which type of mechanism is dominant
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| 3. |
- Smith, E L, et al.
(författare)
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Identification of a novel hepraglycosylceramide with two fucose residues and a terminal hexosamine.
- 1975
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Ingår i: Biochimica et biophysica acta. - 0006-3002. ; 398:1, s. 84-91
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Tidskriftsartikel (refereegranskat)abstract
- A polar fucose-containing glycosphingolipid fraction isolated from dog small intestine has been characterized by mass spectrometry of intact methylated, and methylated and reduced (LiAlH4) glycolipid. The native fraction, which was homogenous on thin-layer chromatography, was shown after methylation to be a mixture of two compounds. One was identified as a hexaglycoslyceramide with the following composition and sequence: fucose-hexose(fucose)-hexosamine-hexose-hexose-ceramide, with a terminal saccharide structure similar to blood group Leb determinants. The second compound was a novel heptaglycosyceramide with the sequence: hexosamine(fucose)-hexose-tfucose)-hexosamine-hexose-hexose-ceramide. This glycolipid was also detected in human small intestine and pancreas. The dog intestinal fraction had phytosphingosine as its major base and contained almost exclusively 2-hydroxy fatty acids (16 : 0--24 : 0). The fraction of human pancreas differed in having spingosine as its major base and normal fatty acids (16 : 0--24 :0) as major acids.
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