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  • 1
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 6 (1983), S. 0 
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 4
    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.
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  • 5
    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.
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  • 6
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Наряду с другими продуктами были получены высшие олефины линейной структуры в олигомеризации этилена при низкой температуре с селективностью 30–58 вес.% и линейностью до 85%. Активированные титан- и цирконий-содержащие комплексы, используемые в качестве катализаторов, были закреплены на SiO2 через связанные на поверхности бидентатные S- и N-содержащие лиганды. При этом первые оказались лучшими, чем последние, с точки зрения качества продукта.
    Notes: Abstract Besides other products, linear middle-range olefins were obtained in the low temperature oligomerization of ethylene with a selectivity of 30–58% and a linearity up to 85%. Activated ticanium and zirconium complexes as catalysts were attached to SiO2 through surface bounded bidentate S- and N-containing ligands, the former being superior to the latter with respect to product quality.
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  • 7
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Auf insgesamt 17 Versuchsflächen wurden Begiftungsversuche mit verschiedenen Köderpräparaten und unterschiedlicher Ausbringungstechnik durchgeführt. Neben der praxisüblichen breitwürfigen Ausbringung wurden die Köder auch konzentriert in Kunststoffbechern oder Tonrohren zusammen mit einem Stück Apfel als Lockmittel ausgelegt. Insgesamt waren die Bekämpfungserfolge sehr unterschiedlich und deshalb noch unbefriedigend. Ganz allgemein war die Wirksamkeit bzw. die Annahme der Giftköder vom gesamten Nahrungsangebot abhängig. Erst bei Nahrungsmangel wurden die Köder in größerem Umfang angenommen. Bei der Verwendung von Ködern mit blutgerinnungshemmenden Wirkstoffen wurden bei der konzentrierten Ausbringung längerfristig etwas bessere Ergebnisse mit einem geringeren Mittelaufwand erzielt als bei breitwürfiger Verteilung der Köder. Bei der Verwendung von Köderstationen erscheint die Verwendung von Lockstoffen und Pheromonen erfolgversprechend.
    Notes: Abstract On 17 field plots of 0,25 to 1 ha in forest plantations of southern Germany various commercial baits containing zinc phosphide, chlorphacinon and diphenacoum were tested in a pilot study for control of harmful small rodents likeMicrotus agrestis, M. arvalis andClethrionomys glareolus. The baits were dispersed in different concentrations over the ground or alternatively they were put together with a piece of apple in bait stations. The animals in the field plots were trapped by means of live traps, marked and released. The efficacy of the treatments was tested by repeating this procedure in consecutive time intervals and by analysing the fractions of marked and unmarked specimens. In comparision with a disperse distribution of the unprotected baits over the ground surface better results and a more lasting success could be mostly obtained with only 9 earthenware pipes distributed over one hectare and filled with a small amount of baits together with a piece of apple. The advantages and disadvantages of the bait station technique are discussed. It is assumed that the efficiency of the bait station technique can be improved by means of attractants and pheromones.
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  • 8
    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
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 44 (1993), S. 156-162 
    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: Unter besonderer Berücksichtigung des Spacereffektes wird die Immobilisierung von Ti-Mg-ZIEGLER-NATTA-Katalysatoren mittels polymerer Grignardverbindungen beschrieben. In Gegenwart von Wasserstoff als Molmassenregler werden die Katalysatoren zur Homopolymerisation von Ethylen bei 85°C und 6 bar eingesetzt. Die Katalysatoraktivität ist in allen Fällen um ein Mehrfaches höher, wenn eine MgCl2-Phase im Verlauf der Katalysatorsynthese auf der Trägeroberfläche ausgebildet wird. Die Aussage wird durch REM- und TEM-Aufnahmen belegt.
    Notes: The immobilization of Ti-Mg catalysts via polymeric Grignards on crosslinked polystyrenes has been achieved in the presence of methylene spacers of varying length. The resulting catalysts are tested in the homopolymerization of ethylene in a suspension process at 85°C and a total pressure of 6 bar. Hydrogen has been used as molecular weight controlling agent. The polymerization activity of the catalysts is significantly enhanced when a MgCl2 phase is generated in the course of catalyst preparation. The results are supported by SEM and TEM techniques.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 10
    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
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