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  • 1
    Electronic Resource
    Electronic Resource
    Elektromechanische Schwingungen, die mit nichtlinearen aktiven Netzwerken selbsterregt werden (1980)
    Springer
    Electrical engineering 62 (1980), S. 5-12 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents Electromechanical convertion system contains three parts: the electrical system, the convertional device and the mechanical system. In the paper it is analyzed an electromechanical convertion realyzed by an electrical system, described by a first-order nonlinear differential equation, and a mechanical system described by a second-order linear differential equation. The convertional device analized in the paper, consists in the magnetoelectric measuring aparatus, that can perform torsional oscillations. it results from the analysis that if the working point of the electrical system is unstable the mechanical system performs sustained oscillations described by nonlinear differential equation of the type Rayleigh.
    Notes: Übersicht Die elektromechanische Konversionssysteme enthalten drei Teile: das elektrische System, die Konversionsanlage und das mechanische System. In der Arbeit wird die elektromechanische Konversion, die durch einer nichtlinearen Differentialgleichung erster Ordnung beschriebenes elektrisches System und ein durch einer linearer Differentialgleichung zweiter Ordnung beschriebenes mechanisches System, analysiert. Die untersuchte Konversionsanlage ist ein magnetselektrisches Messungsgerät, welches Torsionsschwingungen ausüben kann. Aus der Analyse folgt, daß neun der Arbeitspunkt des elektrischen Systems instabil ist, dann übt der mechanische System selbsterregte Schwingungen, die von einer nichtlinearen Differentialgleichung von Rayleighschem Typ beschrieben sind, aus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01578111
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  • 2
    Electronic Resource
    Electronic Resource
    Polymerization of some substituted allyl-carbazoles (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 83 (1979), S. 47-55 
    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: Monomere der Gruppe des in 3 und 3,6 substituierten Allylcarbazols wurden mit Initiatoren wie AIBN, BP und DTBP in Lösung und in Substanz polymerisiert. Die besten Ergebnisse bezüglich der Leistung wurden mit DTBP erzielt. Die Polymeren wurden mittels IR-und NMR-Spektren sowie DTA charakterisiert. Aus der Reihe der synthetisierten Polymeren ist das Poly(N-allyl-3-chlorcarbazol) durch den hohen Schmelzpunkt und die gute Thermostabilität bemerkenswert.
    Notes: The monomers with substituted allyl-carbazole groups were submitted to radical polymerization both in solution and in bulk using AIBN, BP and DTBP as initiators. So 3- and 3,6-substituted polyallylcarbazole oligomers were obtained; their melting points and yields were a function of the used initiator and the reaction conditions. The recorded IR and NMR spectra permitted to establish some common spectral characteristics of the whole class of polymers. Based on thermodifferential analysis the behaviour under heating was studied. In the series of polymers, the poly(N-allyl-3-chlorocarbazole) showed the best thermal stability.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1979.050830104
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  • 3
    Electronic Resource
    Electronic Resource
    On the electroinitiated polymerization of some acetylenic derivatives (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 111 (1983), S. 149-163 
    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: Phenylacetylen, Diphenyldiacetylen und Methylpropiolat wurden mittels elektrochemischer Initiierung in aprotischen, polaren Lösungsmitteln (Dimethylformamid, Dimethylacetamid und Acetonitril) polymerisiert, wobei als Grundelektrolyte quaternäre (alkyl-, aryl- und alkyl-arylsubstituierte) Ammonium-, Phosphonium-, Arsonium- und Stiboniumsalze angewandt wurden. Es wurden die Auswirkung der Natur und der Konzentration der Elektrolyte, der Lösungsmittel und der Elektrolysebedingungen auf die Ausbeuten an Reaktionsprodukten sowie einige Eigenschaften der erhaltenen Polymeren untersucht.
    Notes: Phenylacetylene, diphenyldiacetylene and methyl propiolate were polymerized by electrochemical initiation in aprotic, polar solvents (dimethylformamide, dimethylacetamide and acetonitrile) using ammonium, phosphonium, arsonium and stibonium quaternary salts (alkyl-, aryl- and alkyl-aryl-substituted) as background electrolytes. The effect of electrolyte nature and concentration, of the solvents and of electrolysis conditions on the product yields were studied as well as some properties of the obtained polymers.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1983.051110112
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  • 4
    Electronic Resource
    Electronic Resource
    Electroinitiated polymerization of some acetylenic derivatives, a polarographic study (1983)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 115 (1983), S. 47-59 
    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: Es wurde die polarographische Reduktion von Acetylenderivaten vom Typus des Phenylacetylens, des Diphenyldiacetylens und des Methylpropiolats untersucht, sowie auch die von Elektrolyten vom Typus der quaternären Salze (Ammonium, Phosphonium, Arsonium und Stibonium), um festzustellen, ob die elektro-initiierte Polymerisation durch unmittelbare Elektronenübertragung an das Monomere oder indirekt stattfindet.Es wurden die Halbwellenpotentiale der erwähnten Verbindungen and der Quecksilbertropfelektrode und an einer stationären Platinelektrode gemessen. Aus den Versuchsergebnissen der obigen Polymerisation von Acetylenmonomeren ergaben sich einige Folgerungen für die Kinetik des Polymerisationsvorgangs.
    Notes: The polarographic reduction of some acetylenic derivatives - phenylacetylene, diphenyldiacetylene and methyl propiolate, as well as of some quarternary salts (ammonium, phosphonium, arsonium and stibonium), was investigated in order to establish whether the electroinitiated polymerization process took place by direct electron transfer to the acetylenic monomer or indirectly.The half-wave potentials of the compounds mentioned at the dropping mercury cathode and at the stationary platinum electrode were measured. From the experimental data on the polymerization of the above acetylenic monomers, some statements on the kinetics of the polymerization process were made.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1983.051150105
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