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  • 1
    Electronic Resource
    Electronic Resource
    Bose-Einstein correlations in $$\bar p$$ p annihilations at rest (1994)
    Springer
    The European physical journal 63 (1994), S. 541-547 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two-charged-pion correlations were studied in $$\bar p$$ p(→2π*2π− nπ0,n≥0) annihilations at rest with the CPLEAR detector at the Low-Energy Antiproton Ring (LEAR). A strong enhancement was found in the production of pairs of like-sign pions with a small value of the relative fourmomentumQ, with respect to pairs of unlike-sign pions. The observed enhancement was interpreted as a consequence of the Bose-Einstein symmetrization of the two-pion wave function. The data are well represented by a correlation function parametrized as a double-Gaussian; an exponential parametrization is also statistically acceptable. The value of the correlation strength is found to be 〉1. The high-quality large data samples together with the ability for K± identification and final-state separation allowed the study of systematic effects impacting on theQ dependence of the correlation function and on the extracted space parameters of the pion sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01557618
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pt-Sn/Al2O3 sol-gel catalysts: Metallic phase characterization (1993)
    Springer
    Catalysis letters 21 (1993), S. 309-320 
    Details
    ISSN: 1572-879X
    Keywords: Sol-gel catalysts ; platinum-tin catalysts ; platinum dispersion ; X-ray diffraction ; energy dispersive X-ray analysis ; EDX analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Highly dispersed platinum was found in Pt-Sn/Al2O3 catalysts prepared by the sol-gel method, i.e., cogelation of aluminum tri-sec-butoxide and tetrabutyltin and subsequent impregnation with hexachloroplatinic acid. X-ray diffraction studies showed that the cell parameter of pure platinum is not modified in bimetallic Pt-Sn samples. Moreover, energy dispersive X-ray analysis studies (EDX) showed that platinum, but not tin, was detected in the catalysts where tin was incorporated by the sol-gel coprecipitation of tin and aluminum. Incorporation of tin into the alumina network is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769483
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Selective hydrogenation of o-xylene on noble metals: Thermal effect in selectivity (1992)
    Springer
    Reaction kinetics and catalysis letters 48 (1992), S. 259-264 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Исследовали селективное гидрирование о-ксилола на благородных металлах Pd, Rh, Ni, Pt, Ir, Ru, Os и Re, нанесенных на Al2O3. Найдена корреляция между теплоемкостью электронопроводных металлов и селективностью к образованию цис-продуктов. Сообщают о термическом эффекте на активность и селективность.
    Notes: Abstract Selective hydrogenation of o-xylene on silica supported noble metals Pd, Rh, Ni, Pt, Ir, Ru, Os and Re has been studied. A correlation between the heat capacity of the metal conduction electrons and the selectivity towards the cis-product was found. Thermal effect in activity and selectivity is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02070094
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    o-Xylene hydrogenation on Ru, Pt, Rh and Pd supported catalysts: Dispersity effect on selectivity (1991)
    Springer
    Reaction kinetics and catalysis letters 44 (1991), S. 517-522 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Исследовали селективность к образованию 1,2-цис- и 1,2-транс-диметилциклогексанов в гидрировании о-ксилола на нанесенных катализаторах Pt, Pd, Rh и Ru. Результаты свидетельствуют о чувствительности реакции к размерам частиц.
    Notes: Abstract Selectivity to 1,2-cis- and 1,2-trans-dimethylcyclohexane products was studied in o-xylene hydrogenation over Pt, Pd, Rh and Ru supported catalysts. The results show that selectivity is sensitive to particle size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02073024
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    Paper (German National Licenses)
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