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  • Articles  (14)
  • Chemistry  (12)
  • Computer Systems
  • matrix
  • variable-addressing mechanisms proposed by Rohl, Tanenbaum, Dijkstra and the “local-display method”
  • 1985-1989  (14)
  • 1989  (5)
  • 1985  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and some properties of carbazole modified polyvinylchloride and the cation exchange resin therefrom (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 170 (1989), S. 115-125 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Substitution von Chlor in PVC durch 3,6-Diamino-N-methyl-carbazol entsteht ein Kondensat, das in allen Lösungsmitteln für PVC unlöslich ist. Dieses Kondensat ist thermisch stabiler als PVC. Auch die dielektrischen Eigenschaften unterscheiden sich deutlich von denen von PVC. Die Sulfonierung des PVC-Carbazol-Kondensats liefert ein Kationenaustauscherharz mit SO3H- und COOH-Gruppen.
    Notes: The chlorine displacement reaction between PVC and N-methylcarbazole-3,6-diamine affords a condensate which is insoluble in all possible solvents of PVC. The overall thermal stability of this condensate is appreciably higher than that of PVC. The dielectric behavior is also significantly different from that of unmodified PVC. Sulfonation of the PVC-carbazole condensate affords a cation-exchange resin with —SO3H and —COOH functional moieties.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051700108
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  • 2
    Electronic Resource
    Electronic Resource
    Modified affine law for the elastic and optical properties of low density polyethylene (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 2649-2656 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A unified study of the anomalous mechanical properties and birefringence of low density polyethylene (LDPE) is attempted within the frame work of the rotating element model. The present paper investigates the validity of the affine transformation rule used in the Ward model and suggests a modified affine law which is based on the consideration that the units are only reoriented and, unlike the affine law, are not deformed due to the uniaxial stretching. The relationship between the angles made by the C-axis of the unit with the drawing direction in the undrawn state (θ) and the drawn state (θ), is deduced as sin θ = f(n) sin θ′. From the birefringence data of different polymers a two parameter relation of the form f (n) = exp [-(n - 1)α/β] is suggested. Using this new orientation function, the agreement of the predicted values of E0 and E90 for LDPE for the entire draw ratio range between temperatures of 60°C to -125°C, is quite satisfactory. An interesting feature is that the abrupt change in the values of the parameters α and β at two different temperatures may be associated with a phase transition of LDPE at an intermediate temperature.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021861225
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  • 3
    Electronic Resource
    Electronic Resource
    Architectural support for variable addressing in Ada— A design approach (1985)
    Springer
    International journal of parallel programming 14 (1985), S. 51-72 
    Details
    ISSN: 1573-7640
    Keywords: language-directed architecture ; virtual and real transfer complexity ; variable-addressing mechanisms proposed by Rohl, Tanenbaum, Dijkstra and the “local-display method”
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In designing a language-directed machine architecture, the choice of the technique used in interpreting machine instructions has considerable influence on machine performance. Yet, there does not appear to exist any well established design method for choosing an interpretive mechanism; or for determining the hardware/firmware support for an efficient implementation of such a mechanism. The purpose of this paper is to propose such a design method, based on the use of an architecture description language. The specific architectural focus of the paper is the variable-addressing mechanism in Ada and the implications that such mechanisms have on the implementation of procedure CALL/RETURN and block ENTRY/EXIT functions. The analysis presented in this paper clearly establishes that either Dijkstra's mechanism or “local display method” is not suitable for adoption in designing architectural support for variable-addressing in Ada.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00990901
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  • 4
    Electronic Resource
    Electronic Resource
    Composite model calculation for the thermal expansibility of high density polyethylene (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 173 (1989), S. 111-118 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die thermische Ausdehnung von Polyethylen hoher Dichte wurde mit dem Composit-Modell berechnet, das schon mit Erfolg zur Beschreibung der mechanischen Eigenschaften und der Wärmeleitfähigkeit verwendet wurde. Die Wechsel der Orientierungen der Baueinheiten, aus denen die Masse des Polymeren aufgebaut ist, wurden aus einer empirischen Beziehung mit zwei Parametern abgeleitet, welche die Autoren vorschlugen. Eine vergleichende Untersuchung über die Variation der Orientierungsparameter mit den Verarbeitungsbedingungen wurde ebenfalls durchgeführt.
    Notes: The thermal expansibility of high density polyethylene is calculated within the framework of the composite model which has already been found useful in describing its mechanical properties and thermal conductivity. The orientational changes of the units of which the bulk of the polymer is supposed to be composed has been derived from a two parameter empirical relation proposed by the authors. A comparative study of the variation of the orientational parameters with processing conditions has also been included.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051730109
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and some properties of PVC-bound dimethylglyoxime complexes of Co(II), Ni(II), and Cu(II) (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1243-1252 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Poly(vinyl chloride) (PVC) has been reacted with dimethylglyoxime (DMG) in THF to form the PVC-DMG comples, which has been characterized by spectroscopic and elemental analyses. The latter indicate that there is one DMG moiety anchored on the PVC chain by displacing every 12th Cl atom in the chain. PVC-DMG has further been reacted with alcoholic solutions of Co(II), Ni(II), and Cu(II) to form the intensely colored PVC-DMG-M(II) complexes. The structures of these complexes have been analyzed by elemental and IR spectral analyses. The overall thermal stability of PVC-DMG-M(II) increases in the order: PVC 〈 PVC-DMG-Cu(II) 〈 PVC-DMG-Ni(II) 〈 PVC-DMG-Co(II). The electrical conductivities are also significantly enhanced in the same order. The permittivities of these complexes are high relative to PVC at low frequency falling gradually with increasing frequency and the dielectric loss-frequency behavior is very broad.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380705
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and some properties of anthracene and anthraquinone incorporated poly(vinyl chloride) and the ion exchange resin therefrom (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1641-1651 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Poly(vinyl chloride) has been modified by chlorine displacement reaction with 2-anthrol and anthraquinone-2-ol. The condensates (PVC-ACOL and PVC-AQOL) are insoluble in all solvents common to PVC and have been characterized by elemental and IR spectra analysis. The initial decomposition temperature of these condensates follow the trend: PVC-AQOL (250°C) 〉 PVC-ACOL (200°C) 〉 PVC(190°C) and the overall thermal stabilities beyond 60% decomposition follows the same trend. Permittivity and dielectric loss of these condensates sharply fall with increasing applied frequency (10-1.3 ×107 Hz) to a limiting constant value. In contrast, for unmodified PVC these values are low and remain independent of frequency in the same range. Sulfonation of these PVC condensates affords a weak acid resin with —COOH and —OH ionogenic groups, but no strong sulfonic acid groups due presumably to oxidative degradation of the PVC matrix.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380905
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal stability characteristics of some resins from chemically modified PVC (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 1855-1861 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: PVC has been modified by chlorine displacement reaction with m-aminophenol, bisphenol A, and phenophthalein. Sulfonation of these condensates yields bifunctional weak acid resins which do not exhibit —SO3H ionogenic group. Reaction of PVC with presulfonated bisphenol A, phenolphthalein, and phenol yields strong acid resins. Thermal stability characteristics of these various resins have been determined and the results indicate that such modifications improve the overall thermal stability of PVC.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370709
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  • 8
    Electronic Resource
    Electronic Resource
    Vinyl polymerization by carbon black, IV. Some properties of modified carbon black compared with its polymerization initiating activity (1985)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 129 (1985), S. 43-59 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Alle Arten von Ruß enthalten große Anteile an ungepaarten Elektronen und organischen funktionellen Gruppen. Die Polymerisation wird wahrscheinlich durch die ungepaarten Elektronen auf der Oberfläche ausgelöst; die funktionellen Gruppen haben auf die auslösende Reaktion einen Promotor-Effekt. Alle Eigenschaften wie Textur, Geometrie, Größe der Oberfläche, pH der wäßrigen Aufschlämmung, Aschegehalt und elementare Zusammensetzung haben Einfluß auf die Polymerisation. Diese einschlägigen physikochemischen und Oberflächen-Eigenschaften von nicht modifiziertem und modifiziertem Ruß N 220 wurden im Hinblick auf die Polymerisation von N-Vinylcarbazol untersucht.
    Notes: All grades of carbon black contain large amounts of unpaired electrons and organic functional groups. Polymerization reaction is possibly initiated by the unpaired electrons on the surface; the functional groups have promotional effect on the initiation process. All the properties like texture, geometry, surface area, pH of the aqueous slurry, ash content, and elemental composition have effects on the polymerization reaction. These pertinent physicochemical and surface properties of unmodified and modified N 220 carbon black have been studied in relation to N-vinylcarbazole polymerization.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1985.051290104
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  • 9
    Electronic Resource
    Electronic Resource
    Vinyl polymerization by carbon black, VI. Physico-chemical characteristics of poly(N-vinylcarbazole) prepared by modified and unmodified carbon black (1985)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 134 (1985), S. 151-164 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Initiatorwirksamkeit von unmodifiziertem und durch Vorbehandlung mit verschiedenen protischen und aprotischen Säuren modifiziertem Ruß N 220 wurde für die Polymerisation von N-Vinylcarbazol untersucht. Die physiko-chemischen Eigenschaften der mit diesen Initiatorsystemen erhaltenen Polymeren wurden durch IR-, Röntgen-, 1H-NMR- und 13C-NMR-Spektroskopie, Gelpermeationschromatographie und thermische Analysen untersucht. Unter bestimmten Bedingungen zeigt das entstehende Polymere eine teilweise Unlöslichkeit in Methylethylketon. Im Gegensatz zur üblichen Meinung ist dieses Verhalten nicht auf stereochemische Unterschiede zwischen den Polymereinheiten zurückzuführen, wie durch 13C-NMR-spektroskopische Analysen der in Methylethylketon unlöslichen Fraktion des Polymeren gezeigt wurde.
    Notes: The polymerization initiating activity of carbon black N220, unmodified as well as modified by pretreatment with various protonic and aprotonic acids has been examined in regards to N-vinylcarbazole polymerization. The physico-chemical characteristics of the polymer obtained by these catalyst systems have been investigated by I.R., X-ray, 1H-NMR, 13C-NMR, gel permeation chromatography and thermal analysis measurements. Under certain conditions the resultant polymer shows some partial insolubility in methylethylketone. Contrary to the usual belief, this is not due to any stereochemical difference between the polymeric entities as observed by 13C-NMR spectrum analysis of the methylethylketone insoluble fraction of the polymer.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1985.051340110
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  • 10
    Electronic Resource
    Electronic Resource
    Matrix influence on the tumor cell stimulation of fibroblast collagenase production (1985)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 28 (1985), S. 39-45 
    Details
    ISSN: 0730-2312
    Keywords: matrix ; collagenase ; tumor cells ; cell-matrix interactions ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Cocultures of rabbit fibroblasts and mouse B-16 melanoma cells produce increased levels of collagenase against type I collagen. This stimulatory effect was also found when fibroblasts were cultured in conditioned media from tumor cells. However, the level of the stimulatory factor in conditioned media was influenced by matrix deposited by fibroblasts. Thus, conditioned media collected from mono-layers of B-16 plated on fibroblast matrix consistently showed high levels of the factor activity. The influence of the matrix on the level of the factor was not removed by treating the fibroblast matrix with collagenase or chondroitinase ABC and was not reproduced by collagen-coated dishes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240280107
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