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  • Chemistry  (10)
  • 13.75.Gx Pion-baryon interactions  (2)
  • 36.10.-k Exotic atoms and molecules (containing mesons, muons, and other unusual particles)  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    On kaonic deuterium. Quantum field-theoretic and relativistic covariant approach (2005)
    Springer
    The European physical journal 23 (2005), S. 79-111 
    Details
    ISSN: 1434-601X
    Keywords: 11.10.Ef Lagrangian and Hamiltonian approach ; 11.55.Ds Exact S matrices ; 13.75.Gx Pion-baryon interactions ; 36.10.-k Exotic atoms and molecules (containing mesons, muons, and other unusual particles)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We study kaonic deuterium, the bound K-d state AK d. Within a quantum field-theoretic and relativistic covariant approach we derive the energy level displacement of the ground state of kaonic deuterium in terms of the amplitude of K-d scattering for arbitrary relative momenta. Near threshold our formula reduces to the well-known DGBT formula. The S-wave amplitude of K-d scattering near threshold is defined by the resonances Λ(1405), Σ(1750) and a smooth elastic background, and the inelastic channels K-d → NY and K-d → NYπ, where Y = Σ±,Σ{0} and Λ{0}, where the final-state interactions play an important role. The Ericson-Weise formula for the S-wave scattering length of K-d scattering is derived. The total width of the energy level of the ground state of kaonic deuterium is estimated using the theoretical predictions of the partial widths of the two-body decays AKd → NY and experimental data on the rates of the NY pair production in the reactions K-d → NY. We obtain Γ{1s} = (630±100)eV. For the shift of the energy level of the ground state of kaonic deuterium we predict ε{1s} = (325±60)eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2004-10055-3
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  • 2
    Electronic Resource
    Electronic Resource
    From solar proton burning to pionic deuterium through the Nambu-Jona-Lasinio model of light nuclei (2005)
    Springer
    The European physical journal 23 (2005), S. 1-6 
    Details
    ISSN: 1434-601X
    Keywords: 11.10.Ef Lagrangian and Hamiltonian approach ; 13.75.Gx Pion-baryon interactions ; 36.10.-k Exotic atoms and molecules (containing mesons, muons, and other unusual particles) ; 26.65.+t Solar neutrinos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Within the Nuclear Nambu-Jona-Lasinio model of light nuclei (the NNJL model), describing strong low-energy nuclear interactions, we compute the width of the energy level of the ground state of pionic deuterium. The theoretical value fits well the experimental data. Using the cross-sections for the reactions νe + d → p + p + e- and νe + d → p + n + νe, computed in the NNJL model, and the experimental values of the events of these reactions, detected by the SNO Collaboration, we compute the boron neutrino fluxes. The theoretical values agree well with the experimental data and the theoretical predictions within the Standard Solar Model by Bahcall. We argue the applicability of the constraints on the astrophysical factor for the solar proton burning, imposed by helioseismology, to the width of the energy level of the ground state of pionic deuterium. We show that the experimental data on the width satisfy these constraints. This testifies an indirect measurement of the recommended value of the astrophysical factor for the solar proton burning in terrestrial laboratories in terms of the width of the energy level of the ground state of pionic deuterium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2004-10070-4
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  • 3
    Electronic Resource
    Electronic Resource
    Selektive Gasspurenmessung mit automatischen Analysengeräten (1957)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 29 (1957), S. 256-258 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird ein automatisches Gasanalysengerät beschrieben, bei dem die Lichtabsorption nach chemischer Umsetzung des Gases in der Absorptionsflüssigkeit gemessen wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330290406
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  • 4
    Electronic Resource
    Electronic Resource
    Crystallinity and lateral crystallite size of different UHMW PE materials (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 863-866 
    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: Nascent high-molecular-weight (UHMW) polyethylene (PE) samples of different origins show a rather high crystallinity of about 70-75% and contain both a major portion of orthorhombic extended chain crystallites and a minor portion of triclinic crystallites. The triclinic content is greater the higher the molecular weight of the sample and the higher the activity of the used catalyser. A melting / recooling treatment results in a reduction of crystallinity by about 15-25% and disappearance of the triclinic phase. Further, an irreversible conversion of nascent orthorhombic extended chain crystallites to orthorhombic folded chain crystallites of increased lateral dimensions and crystalline perfections takes place during the melting / recooling treatment. The results are compared to those obtained for lower-molecular-weight PE samples and for high-strength / modulus PE fibers of different origins.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420332
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  • 5
    Electronic Resource
    Electronic Resource
    Selbstkompensierende Analysengeräte zur Spurenmessung (1965)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 37 (1965), S. 1069-1071 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden drei Geräte für die Spurenmessung in Flüssigkeiten und Gasen beschrieben, bei denen durch selbsttätige Blindwert- bzw. Nullpunktkompensation Störeinflüsse ausgeschaltet und die Empfindlichkeit um mehrere Zehnerpotenzen verbessert werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330371013
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  • 6
    Electronic Resource
    Electronic Resource
    Ein neuer, nichtdispersiver UV-Betriebsanalysator mit automatischer Nullpunkt-Kompensation und neuartigem LichtempfängerGekürzte Fassung eines Vortrages anläßlich der ACHEMA, 17. bis 24. Juni 1970 in Frankfurt/M. (1970)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 42 (1970), S. 898-902 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Zur Prozeßüberwachung wurde ein nichtdispersives Betriebsphotometer für das UV-Gebiet entwickelt, das einen neuartigen Lichtempfänger benutzt. Es arbeitet mit automatischer Nullpunkt-Kompensation und hat daher einen besonders geringen Wartungsbedarf.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330421307
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  • 7
    Electronic Resource
    Electronic Resource
    High-active Ziegler-Natta catalysts on polymeric supports for the manufacture of injection moulding polyethylene (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 601-607 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Immobilisierung von Ti-Mg-Ziegler-Natta-Katalysatoren auf polymeren Trägern aus linearem und vernetztem Polystyren wird beschrieben. Die Katalysatoren werden zur Homopolymerisation von Ethylene im Suspensionsproveß bei 0.84 MPa und 358 K eingesetzt. In Gegenwart von Wasserstoff als Molmassenregler wird Spritzgußpolyethylen in hoher Ausbeute erhalten. Der Einfluß verschiedener Trägerparameter auf katalytische Aktivität, Schmelzindex und Schüttdichte des Polymerisats wird untersucht.
    Notes: Polymeric supports on the base of linear and crosslinked polystyrenes have been used in this work for the immobilization of Ti-Mg Ziegler-Natta complexes. The resulting catalysts are tested in the homopolymerization of ethylene in a suspension process at 358 K and a total pressure of 0.84 MPa. By use of hydrogen for molecular weight control, injection moulding polyethylene in good yield is obtained. Influences of support parameters on a catalytic activity, melt flow index, and bulk density are studied.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010411203
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  • 8
    Electronic Resource
    Electronic Resource
    Über Mischsalzkontakte. XIV. Selektive Hydrierung von Cyclopropan und Propen an Nickelkontakten. I (1962)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 314 (1962), S. 167-178 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The hydrogenation of propene and cyclopropane occuring on doted Ni-containing carrier oxides (Al2O3, MgO, SiO2) has been investigated. By doting with Zn, Cd, and their oxides (all being n-conducting), first the hydrogenation of cyclopropane is poisoned. At higher amounts of the doted components, the hydrogenation of propene is stopped, too. Cd and CdO have a ten-fold efficiency than Zn and ZnO, respectively.
    Notes: Es wurde die Hydrierung von Propen und die destruktive Hydrierung von Cyclopropan an dotierten nickelhaltigen Trägerkontakten untersucht. Als Träger fanden Al2O3, MgO und SiO2 Verwendung; die Dotierung erfolgte mit Zink, Cadmium und deren Oxyden. Durch die n-Leiterwirkung dieser Oxyde auf das Nickel wird zunächst die Hydrierung von Cyclopropan vergiftet, während bei Zugabe größerer Mengen der Dotierungskomponente auch die Hydrierung von Propen zum Erliegen kommt. Cadmium und Cadmiumoxyd haben eine etwa 10fach bessere Wirkung als die entsprechenden Zinkverbindungen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19623140306
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  • 9
    Electronic Resource
    Electronic Resource
    Über Mischsalzkontakte. XV. Selektive Hydrierung von Cyclopropan und Propen an Nickelkontakten. II (1962)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 314 (1962), S. 179-188 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The hydrogenation of propene and cyclopropane occuring on catalysts, which were prepared by thermal decomposition of Ni/Zn-and Ni/Cd-mixed oxalates, has been studied. Complete selectivity has been achieved.Higher amounts of CdO hinder the hydrogenation of propene; NiO, being a p-conductor, activates the hydrogenation of cyclopropane.
    Notes: Es wurde die Hydrierung von Propen und die destruktive Hydrierung von Cyclopropan an Kontakten untersucht, die aus Nickel-Zink-Mischoxalaten und Nickel-Cadmium-Mischoxalaten durch Zersetzung im Vakuum hergestellt wurden. Es konnte eine vollständige Selektivierung erreicht werden; bei größeren Mengen Cadmiumoxyd im Kontakt wird auch Propen nur noch teilweise hydriert. Weiterhin wurde der Einfluß von Nickeloxyd untersucht. Nickeloxyd aktiviert als p-Leiter die Hydrierung von Cyclopropan. Die Ergebnisse werden diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19623140307
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  • 10
    Electronic Resource
    Electronic Resource
    Über den Zusammenhang zwischen Acidität und katalytischer Aktivität an hydratisierten Zinkoxidoberflächen (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 355 (1967), S. 242-252 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The total surface acidity and the acid strength distribution of acidic centres was determined from acidity measurements of partially dehydrated zinc oxide surfaces by n-butylamine titration using appropriate Hammett indicators. A correlation was observed between acidity and catalytic activity on the isomerisation of cyclopropane. The content of nonstoichiometric zinc did not directly effect the catalytic activity.
    Notes: Aus Aciditätsmessungen an partiell dehydratisierten Zinkoxidoberflächen mittels n-Butylamintitration und unter Verwendung geeigneter Hammett-Indikatoren wurde Anzahl und Stärke von sauren Zentren ermittelt. Es besteht eine Korrelation zwischen Oberflächenacidität und katalytischer Aktivität hinsichtlich der Isomerisierung von Cyclopropan. Ein direkter Zusammenhang zwischen katalytischer Aktivität und Gehalt an Überschußzink wurde nicht gefunden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673550505
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