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  • 1
    Electronic Resource
    Electronic Resource
    Chemical interactions in blends of bisphenol A polycarbonate with tetraglycidyl-4,4'-diaminodiphenylmethane epoxy (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 6779-6786 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00124a012
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  • 2
    Electronic Resource
    Electronic Resource
    Unsaturated macrocyclic compounds. LXXXIX. Dianion of [18]annulene (1973)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 95 (1973), S. 7337-7345 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00803a022
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fluorene-based polymers-preparation and applications (2000)
    Springer
    Journal of materials science 11 (2000), S. 111-116 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper briefly reviews our work on the syntheses and applications of a family of fluorene-based polymers. We have found that fluorene as a monomer offers a number of advantages, the most significant being its ability to impart solubility while maintaining a high degree of delocalization. An improved Pd-catalyzed polymerization procedure has enabled the preparation of a large variety of fluorene homopolymers and copolymers. Unlike PPV and related materials, LED devices with fluorene polymers in a conventional configuration appear to have electrons as the majority carrier and their performance is markedly improved when modified with an appropriate polymeric hole transporting layer. An optimized green-emitting device exhibits very high luminance (10 000 cd m-2) at very low bias (〈 7 V) and high efficiency (∼10 lm W-1), attributable in part to the high hole mobility of fluorene-based polymers. Applications of these materials to other electronic devices, such as field effect transistors and photocells, are in progress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008917128880
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  • 4
    Electronic Resource
    Electronic Resource
    The expectation gap in auditing (1998)
    Bingley : Emerald
    Managerial auditing journal 13 (1998), S. 147-154 
    Details
    ISSN: 0268-6902
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: There is concern that auditors and the public hold different beliefs about the auditors' duties and responsibilities and the messages conveyed by audit reports. In recent years, some spectacular and well-publicised corporate collapses and the subsequent implication of the reporting auditors have highlighted the audit expectation gap. Apparently, public misperceptions are a major cause of the legal liability crisis facing the accounting profession. Given the significance of the expectation gap, it is not surprising therefore that prior research on the expectations problem is substantial. The objective of this paper is to review the literature on the audit expectation gap along the following lines: definition of the expectation gap; nature and structure of the expectation gap; and ways to reduce the expectation gap. It is hoped that such an attempt can provide insights into the audit expectation gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02686909810208038
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  • 5
    Electronic Resource
    Electronic Resource
    A differential scanning calorimetry study on poly(ethylene terephthalate) isothermally crystallized at stepwise temperatures: multiple melting behavior re-investigated (1996)
    Springer
    Colloid & polymer science 274 (1996), S. 309-315 
    Details
    ISSN: 1435-1536
    Keywords: Multiple melting ; DSC-crystallization ; poly(ethylene terephthalate) ; lamellar thickness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The multiple melting behavior of poly(ethylene terephthalate) (PET) was investigated with differential scanning calorimetry (DSC) by examining PET samples having been subjected to special schemes of crystallization and annealing treatment at multiple descending temperatures. Upon such step-wise annealing in decreasing temperatures, the existence of doublet melting peaks in addition to a series of multiple minor peaks in the PET has been demonstrated using carefully designed thermal schemes. Using the Hoffman theory, multiple lamellae populations, might be suggested to be simultaneously present in the PET subjected to such thermal treatments. However, direct experimental evidence has yet to be provided. The low-temperature minor crystals simply melt during normal scanning without having time enough to reorganize into higher-melt crystals. Nevertheless, the effect of scanning on non-isothermal crystallization does exist but is primarily confined to the temperature range much below the main melting region where the crystallization of polymer chains can progress at a reasonable rate. At higher temperatures near the main melting region, annealing for extended times is required in order to result in relative changes of the melting endotherms of the upper and lower peaks in the main melting doublet. In all we have shown that interpretations of the multiple melting phenomenon in semicrystalline polymers can be better refined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654051
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  • 6
    Electronic Resource
    Electronic Resource
    CT appearance in hypertensive encephalopathy (1987)
    Springer
    Neuroradiology 29 (1987), S. 215-215 
    Details
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327557
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Bulbar palsy aggravated by metrizamide CT cisternography (1987)
    Springer
    Neuroradiology 29 (1987), S. 219-219 
    Details
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327561
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  • 8
    Electronic Resource
    Electronic Resource
    Dystrophic intracranial calcification: CT evidence of ‘cerebral steal’ from arteriovenous malformation (1987)
    Springer
    Neuroradiology 29 (1987), S. 519-522 
    Details
    ISSN: 1432-1920
    Keywords: Intracranial calcification ; Arteriovenous malformation ; Cerebral steal ; Steal phenomenon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Two cases of dystrophic intracranial calcification due to arteriovenous malformations (AVM) are reported. The characteristic distribution is in the watershed areas and away from the AVM. Deposition of calcium on ischaemic brain tissues as a result of ‘cerebral steal’ by the AVM is the probable pathogenetic mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350433
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  • 9
    Electronic Resource
    Electronic Resource
    Relationships between ringed spherulitic morphology and miscibility in blends of poly(ɛ-caprolactone) with poly(benzyl methacrylate) versus poly(phenyl methacrylate) (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 1032-1042 
    Details
    ISSN: 1435-1536
    Keywords: Key words Spherulites ; Ring bands Interactions ; Miscibility ; Poly(ɛ-caprolactone)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Ringed spherulites are an interesting phenomenon that is observed only in very few miscible systems. For the first time, the relationship between the state of chain intermixing and the ring-band pattern was demonstrated. Two previously demonstrated miscible blend systems, poly(ɛ-caprolactone) (PCL) with poly(benzyl methacrylate) (PBzMA) and PCL with poly(phenyl methacrylate) (PPhMA), were studied in order to understand the mechanism of ring-band formation in the spherulites and the relationships between the ring-band pattern and the state of miscibility. In both miscible PCL/PBzMA and PCL/PPhMA systems, extinction rings were observed within the PCL spherulites. In the PCL/PBzMA blend, the extinction rings are not as distinct (owing to distortion) as those in the PCL/PPhMA blend system. Analysis was performed and discussions were made to reveal relationships between miscibility, interaction strength, and the pattern of the ring bands in the PCL spherulites in polymeric mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000355
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  • 10
    Electronic Resource
    Electronic Resource
    Blends of a novel high-temperature poly(oxy-1,4′-diphenyleneoxy-1,4-phenylenecarbonyl-1,4-phenylene) with poly(ether imide): structure, interaction, and miscibility (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 392-398 
    Details
    ISSN: 1435-1536
    Keywords: Key words Miscibility ; Poly (ether imide) ; Poly(ether diphenyl ether ketone) ; Interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Polymer miscibility has been discovered in a blend system comprising poly(ether imide) (PEI) and a new poly(ether diphenyl ether ketone) (PEDEK). The miscibility of the PEDEK/PEI polymer system (quenched from the molten state) was investigated in this study using differential scanning calorimetry and Fourier transform (FT-IR) spectroscopy. A composition-dependent single glass-transition temperature (T g) in the PEDEK/PEI blends over a full composition range was observed; the sharp transition width and the T g–composition relationship both suggest that the scale of mixing is fine and uniform. Evidence based on observation of the cold-crystallization peak and suppression of the blend crystallinity and melting peak also indicated intimate intermolecular mixing. The FT-IR result yielded further evidence that the physical interactions leading to miscibility were weak, with no apparent specific interactions between the constituent polymers. Relationships between structures and interactions responsible for the miscibility in PEI and several ether-ketone-type polymers are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050531
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