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  • 11
    Electronic Resource
    Electronic Resource
    Sub-barrier fusion induced by ^3^5C1 and ^3^7C1 beams on ^2^4^,^2^5^,^2^6Mg isotopes
    Amsterdam : Elsevier
    Nuclear Physics, Section A 513 (1990), S. 174-186 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(90)90347-O
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  • 12
    Electronic Resource
    Electronic Resource
    Search for high energy γ-rays emission in28Si,32S+64Ni dissipative reactions at about 5 MeV/amu incident energy (1991)
    Springer
    The European physical journal 340 (1991), S. 341-342 
    Details
    ISSN: 1434-601X
    Keywords: 24.30.Cz ; 25.70−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photons emitted in the28 Si+64 Ni and32 S+64 Ni reactions at 143 MeV and 156 MeV incident energy respectively, have been detected in coincidence with the ejected charged fragments. An array of 48 BaF2 γ-rays detector and 6 solid state silicon detector telescopes have been used. Photon energy spectra measured in the energy range from 2 to 20 MeV in coincidence with ejectiles coming from deep inelastic reactions, are consistent with statistical emission from the reaction products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294684
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  • 13
    Electronic Resource
    Electronic Resource
    Structural modifications of a spent molten carbonate fuel cell (1990)
    Springer
    Journal of applied electrochemistry 20 (1990), S. 804-810 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Several performance and endurance tests have been carried out on molten carbonate fuel cells (MCFC) operating at different temperatures (873, 893 and 923 K). Electrochemical performance parameters, morphological characteristics and chemical analyses on samples of spent electrodes and tiles were evaluated. An output power decrease of 10% from the original value was taken to be the largest acceptable decay. Cell operation was stopped upon reaching this point. Electrolyte losses ranging from 18.6 to 24.5 of the original content were the determining factor in the MCFC performance decrease. Scanning electron microscopy showed that post-test anodes retained a satisfactory microstructure, while the tiles appeared to be very sensitive to the effect of operating temperature. The cathode structure, after an initialin situ oxidation, appeared to consist of agglomerates of 0.9 μm NiO crystallites. Long-term operation produces some modification of the pore size distributions of the used components, resulting in a final electrolyte distribution that was far from optimal. Due to the opposite effect of temperature on cell lifetime and power output, the highest power output and shortest cell lifetime were obtained for the 923 K test.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01094310
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  • 14
    Electronic Resource
    Electronic Resource
    A Generalization of the Stone–Von Neumann Theorem to Nonregular Representations of the CCR-Algebra (1999)
    Springer
    Letters in mathematical physics 47 (1999), S. 307-320 
    Details
    ISSN: 1573-0530
    Keywords: Stone–von Neumann theorem ; Weyl algebra ; measurable representations.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We give a classification, up to unitary equivalence, of the representations of the C*-algebra of the Canonical Commutation Relations which generalizes the classical Stone–von Neumann Theorem to the case of representations which are strongly measurable, but not necessarily strongly continuous. The classification includes all the (nonregular) representations which have been considered in physical models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007599222651
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  • 15
    Electronic Resource
    Electronic Resource
    Oxidative chemical polymerization of pyrrole (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 2649-2655 
    Details
    ISSN: 1572-8943
    Keywords: calorimetry of conductive polymers ; conducting polymers ; kinetics of polypyrrole ; polypyrrole ; thermodynamics of polypyrrole
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mittels eines Reaktionskalorimeters wurden bei drei verschiedenen Temperaturen die Enthalpiewerte der Polymerisation von in Acetonitril gelöstem Pyrrol, unter der Anwendung von FeCl3 als Oxidationsmittel bestimmt. Aus den kalorimetrischen Daten ergibt sich, daß es sich bezogen auf Pyrrol um eine Reaktion erster Ordnung handelt. Bei den gleichen Temperaturen wurden auch die Geschwindigkeitskonstanten bestimmt. Unter Anwendung der Arrhenius'schen Gleichung haben wir auch die Aktivierungsenergie der Bildung dieses elektronenleitenden Polymers ermittelt.
    Notes: Abstract A reaction calorimeter has been used to determine at three different temperatures the enthalpy values for the polymerization of pyrrole dissolved in acetonitrile, by using FeCl3 as the oxidative agent. From the calorimetric data it has been found that the reaction is first-order with respect to the pyrrole. The rate constants at the same temperatures have also been determined. By using the Arrhenius equation we have obtained the activation energy for the formation of this electroconducting polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979741
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  • 16
    Electronic Resource
    Electronic Resource
    Optimization of Polypyrrole Chemical Synthesis by Heat Flow Reaction Calorimetry (1999)
    Springer
    Journal of thermal analysis and calorimetry 58 (1999), S. 3-12 
    Details
    ISSN: 1572-8943
    Keywords: conducting polymers ; polypyrrole ; pyrrole ; reaction calorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Chemical polymerization of pyrrole (Py) was carried out in a reaction calorimeter by using FeCl3 or CuCl2 as an oxidant in an acetonitrile medium. The formation heat of polypyrrole (PPy), determined under a wide range of reactant concentrations and reaction temperatures, is directly related to the PPy yields and to the degree of polymerization. Due to the negative values of both the entropy and enthalpy of the reaction the gravimetric yield is inversely related to the temperature and directly to the Py concentration. The yields to the PPy and the related reaction heats, are close to zero when the ‘ceiling temperatures’ are reached (Tceil=348 K for Fe-doped and Tceil=313 K for Cu-doped PPys). It was observed that a ‘ceiling concentration’ corresponds to each ‘ceiling temperature’ and only light oligomers are formed if Py concentration is too low. The electric conductivity values of the products were also determined and a direct relationship to the yields was found as well. The highest electric conductivity value (C=0.6 S cm−1) was related to the PPy fresh synthesized from a 0.017 M Py solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010107331659
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  • 17
    Electronic Resource
    Electronic Resource
    Hydrogen Production by Steam Reforming of Ethanol: A Two Step Process (2000)
    Springer
    Reaction kinetics and catalysis letters 71 (2000), S. 143-152 
    Details
    ISSN: 1588-2837
    Keywords: Ethanol steam reforming ; hydrogen ; two-layer fixed-bed catalytic reactor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A two-layer fixed-bed catalytic reactor for hydrogen production by steam reforming of ethanol is proposed. In this reactor ethanol is first converted to acetaldehyde over a Cu-based catalyst and then acetaldehyde is converted to a hydrogen-rich mixture over a Ni-based catalyst. It is shown that the use of such type of reactor prevents coke formation and provides hydrogen yields closed to equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010311005595
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  • 18
    Electronic Resource
    Electronic Resource
    Catalytic Beckmann rearrangement of cyclohexanone oxime to caprolactam over metal sulfates (1983)
    Springer
    Reaction kinetics and catalysis letters 22 (1983), S. 197-202 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Бэкмановская перегруппировка циклогексаноноксима до капролактама была исследована в газовой фазе на сульфатных катализаторах. Наиболее активным и селективным образцом оказался Al2(SO4)3. Каталитическая активность увеличивается с электроотрицательностью металлических катионов. Селективность к капролактаму вероятно связана с некоторыми специфическими взаимодействиями между нитроксильными промежуточными соединениями и металлическими катионами. Исследввали эффект диспергирования Al2(SO)4)3 на окисном материале.
    Notes: Abstract The Beckmann rearrangement of cyclohexanone oxime to caprolactam has been studied in the vapor-phase over sulfate catalysts. Al2(SO4)3 was the most active and selective sample. Catalytic activity was found to increase with electronegativity of the metal-cation. Selectivity to caprolactam is probably related also to some specific interaction between nitrenium intermediates and metal cations. The effect of dispersing Al2(SO4)3 on an oxide material has also been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02064832
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  • 19
    Electronic Resource
    Electronic Resource
    Isomerization-disproportionation of m-xylene over dealuminated mordenites (1984)
    Springer
    Reaction kinetics and catalysis letters 25 (1984), S. 79-82 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Изомеризация-диспропорционирование м-ксилола было исс ледовано на серии деалюминированных морденитов, характеризуемых отноше нием Si/Al, изменяющимся от 5 до 15. Каталитическая активность увелич ивается с увеличением отношения Si/Al, а соответственно зтому и продукты диспропорционирования. Зто поведение обьясняется на основе увеличив ающейся кислотной силы, приводящей к высокой активности и селек тивности к диспропорционированию, через общий механизм, который включает в себя как параллельные, так и последовательные ступени.
    Notes: Abstract The isomerization-disproportionation of m-xylene has been investigated over a series of dealuminated mordenites characterized by Si/Al ratios varying from 5 to 15. Catalytic activity increases with the Si/Al ratio and correspondingly also the products of disproportionation. This behavior is interpreted in terms of increasing acid strength leading to a higher activity and selectivity to disproportionation through a common mechanism which involves both a parallel and a consecutive route.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02076544
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  • 20
    Electronic Resource
    Electronic Resource
    Solid-State Equilibria in the MoO3 - TeO2 - Al2O3 System (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 510 (1984), S. 189-193 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die binären und ternären Gleichgewichte im System MoO3 - TeO2 - Al2O3 wurden rötgenographisch untersucht. Bei 750°C in Luft wurden in diesem System die im Abstract angegebenen koexistierenden Bereiche gefunden. Eine Bildung ternärer Verbindungen konnten im untersuchten Temperaturbereich (450 - 750°C) nicht beobachtet werden.
    Notes: The binary and ternary equilibrium reactions of Al2O3 with TeO2 and MoO3 were studied by X-ray diffraction methods and the following compatibility ranges were determined in the TeO2 - MoO3 - Al2O3 system at 750°C in air: TeO2, Te2MoO7, Al2TeO6; Te2MoO7, MoO3, Al2TeO6; MoO3, Al2(MoO4)3, Al2TeO6; Al2(MoO4)3, Al2O3, Al2TeO6. Ternary compound formation was not observed in the temperature range investigated (450 - 750°C).Phasengleichgewichte im System MoO3 - TeO2 - Al2O3.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845100326
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