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  • 1
    Digitale Medien
    Digitale Medien
    STREPTOCOCCAL PYODERMA AND ACUTE NEPHRITIS IN TRINIDAD (1972)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 86 (1972), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary.— Following the major epidemic of acute glomerulonephritis in Trinidad in 1964 and 1965, streptococcal skin infection was studied among schoolchildren. Infection was found on 1.5% of the children in an urban school. Simultaneous infections with more than one strain of Streptococcus pyogenes were found in some children, and also the replacement of one strain by another between weekly swabbings. Skin infection was more prevalent at a rural school (15%). In a year-long study the frequency of infection was found to be related to poverty, and to age and sex, diminishing with increasing age more rapidly in females than in males. The average for the school was one new streptococcal infection per child per 10 weeks. Spread was usually from skin to skin, possibly assisted by non-biting Hippelates flies; involvement of nose or throat was commonly secondary to skin infection.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2133.1972.tb15416.x
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  • 2
    Digitale Medien
    Digitale Medien
    Origin of Extended-chain Lamellae in Polyethylene (1968)
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 368-370 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The first crystallizations under pressure revealed that growth from the melt at 227 C gave ECL alone above 4 kbar but a mixture of ECL and FCL in the range 2 to 4 kbar, the two being sharply differentiated by an ~ 10 C difference in melting point2. The presence of two separate phases rather than a ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/219368a0
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  • 3
    Digitale Medien
    Digitale Medien
    Solid State Polymerization at {00.1} Sub-grain Boundaries of Trioxane (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 731-732 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The evidence in the literature appears to be conflicting. On one hand, this process is the example par excellence in which polymer crystals are ordered with respect to the monomer1 a view based on X-ray evidence2 from crystals polymerized to maximum yield and supported by observations of polymer ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/215731a0
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  • 4
    Digitale Medien
    Digitale Medien
    Evidence for Distinct Sectors in Polymer Single Crystals (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 810-811 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Fig. 1. Polyethylene crystal grown from xylene at 90 C. Electron-micrograph, x 2,500 Fig. 2. Polyethylene crystal grown from xylene at 90 C. showing sector through extinction effects. Electronmicrograph, x 1,500 Fig. 3. Polyethylene crystal grown from xylene at 90 C, after thermal treatment (see ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/184810a0
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  • 5
    Digitale Medien
    Digitale Medien
    Electron Microscopy of Polyethylene below 20° K (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 1107-1108 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Polyethylene is a suitable substance in which to search for prolonged lifetimes of crystals, because not only is it a much studied material whose radiation chemistry is comparatively well understood, but also there appears a priori to be a reasonable chance of success. For example, alkyl free ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/2141107a0
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  • 6
    Digitale Medien
    Digitale Medien
    Morphology of compacted polyethylene fibres (1993)
    Springer
    Journal of materials science 28 (1993), S. 1107-1112 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The microstructure of aggregates of parallel high-modulus polyethylene fibres, compacted at 138°C to give a composite with good mechanical properties, has been examined. Detail of transverse and longitudinal cross-sections has been revealed by permanganic etching and studied electron microscopically. The fibres pack together irregularly with coordination numbers typically between 4 and 7 and fibre diameters in the range 10–20 μm. Misalignment of fibres is generally close to zero but does occur incrementally, by 10° and more, between successive rows of fibres. A substantial proportion of fibres has deformed, often by shear, during treatment producing a broadening of interfibrillar contacts. A lamellar component of texture is present both between and within fibres. It is inferred to form by melting of those parts of the fibres where there is least constraint on the melt, followed by recrystallization on the fibres as nuclei. The lamellae therefore share the axial orientation of the fibres, while the crystallographic fibre/lamellar contact promotes good transverse properties.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00400899
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  • 7
    Digitale Medien
    Digitale Medien
    Compliances and failure modes of oriented chain-extended polyethylene (1979)
    Springer
    Journal of materials science 14 (1979), S. 2679-2687 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The quantitative dependence of Young's modulus and fracture behaviour on the angle between the tensile axis and the orientation direction has been determined for oriented polyethylene with lamellae of chain-extended dimensions. The form of the modulus dependence was similar to that for the majority of oriented polymers which have been studied, but the fracture behaviour was atypical, ductility only being obtained when the test axis was parallel to the orientation direction, with brittle fracture occurring in all other directions for all except very high molecular mass materials. The behaviour of this material in compression alongc has also been studied; in this case kink bands andc-axis cleavage were observed. It is shown that kink band formation may be explained solely by uniformc axis shear deformation of the lamellar crystals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00610639
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  • 8
    Digitale Medien
    Digitale Medien
    Delineating water trees in cross-linked polyethylene: a new technique (1992)
    Springer
    Journal of materials science 27 (1992), S. 5192-5198 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A new technique has been developed to image water trees in polymeric insulated cables. The method is based upon permanganic etching and enables water trees to be examined either optically or by electron microscopy. Use of transmission electron microscopy allows the water tree and matrix microstructures to be imaged simultaneously. Relationships between polymer morphology and water-tree growth may therefore be studied. The technique and its application to the study of water-tree microstructure in cross-linked polyethylene using optical, scanning electron and transmission electron microscopy, is described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00553390
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  • 9
    Digitale Medien
    Digitale Medien
    Morphological changes in pressure annealed polyethylene (1996)
    Springer
    Journal of materials science 31 (1996), S. 5541-5549 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Polyethylene samples have been annealed under high pressures in order to transform the morphology and thereby make specimens, which on subsequent orientation by hydrostatic extrusion, produce high-modulus materials for comparatively low deformation ratios. The pre-extrusion morphology, as revealed by permanganic etching followed by transmission electron microscopy, is shown to be highly sensitive to the annealing conditions, especially in the vicinity of the orthorhombic/hexagonal phase boundary. The morphological changes have also been studied by gel permeation chromatography of nitrated samples and by differential scanning calorimetry. The moduli of samples, extruded to a standard extrusion ratio of 7, reflect differences in the morphology of the starting material. It is shown that the highest modulus is not obtained by annealing totally within the hexagonal phase but rather in the changeover region between it and the orthorhombic phase. Although the lamellar size can be dramatically increased by annealing within the hexagonal phase, this development occurs at the expense of reducing the integrity of the molecular network so that for high lamellar size the modulus falls and the samples become increasingly incoherent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01159328
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  • 10
    Digitale Medien
    Digitale Medien
    The hot compaction of polypropylene fibres (1996)
    Springer
    Journal of materials science 31 (1996), S. 1157-1163 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Investigation of the compaction of unidirectionally arranged high-tenacity polypropylene fibres is described. A combination of techniques, with the major emphasis being morphological studies, show that controllable “selective” surface melting is not achieved at a high enough proportion to give substantial fibre-to-fibre bonding, and hence good lateral strengths.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353094
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