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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Annales geophysicae 17 (1999), S. 304-306 
    ISSN: 0992-7689
    Keywords: Magnetospheric physics (MHD waves and instabilities)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract It is pointed out that simple models adopted so far have tended to neglect the obliquity of the magnetic field lines entering the Earth’s surface. A simple alternative model is presented, in which the ambient field lines are straight, but enter wedge shaped boundaries at half a right-angle. The model is illustrated by assuming an axially symmetric, compressional, impulse type disturbance at the outer boundary, all other boundaries being assumed to be perfectly conducting. The numerical method used is checked from the instant the excitation ceases, by an analytical method. The first harmonic along field lines is found to be of noticeable size, but appears to be mainly due to coupling with the fundamental, and with the first harmonic across field lines.
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 581-582 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the course of an investigation of the spatial distribution of rapid geomagnetic fluctuations during a typical magnetic storm (November 9-13, 1956) evidence has been found of a general motion eastwards of the pattern of disturbance, and, since the velocity found is of the same order as that given ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 184.1959, 4688, B.A.34-, (19 S.) 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Vector diagrams of the variations in a horizontal plane are shown in Fig. 2a and b. Fig. 2a refers to the first explosion, and Fig. 26 to the second. The effects at Palmyra, Fanning and Jarvis are very similar, and only the Jarvis Island diagram is presented here. Variations in a vertical plane are ...
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 33 (1993), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Growth inhibition of pot-grown Elymus repens (L.) Gould by fluazifop-butyl was occasionally enhanced by pre-treatment with ethephon. Studies with 14C-labelled fluazifop-butyl showed that ethephon increased the accumulation of 14C in basal buds and proximal parts of the rhizome system. This potential modification in the distribution of fluazifop-butyl within E. repens rhizomes may have reduced regeneration and recovery of the E. repens, particularly from the basal buds, although there was no increase in the proportion of 14C translocated into the rhizome. Also, ethephon not only activated the sinks in the rhizome but in the foliage of E. repens as well, and could initiate buds without sinks. The effects of ethephon on fluazifop-butyl phototoxicity were irregular in their occurrence and degree, and possible reasons for this are discussed.Effets depré-traitements à I'étéphon sur la réponse de Elymus repens au fluazifop-butylLors d'expériences en pots, des pré-traitements & 1'étéphon augmentaient occasionnellement 1'inhibition de croissance d'Elymus repens (L.) Gould traité au fluazifop-butyl. Des etudes avec du fluazifop-butyl marqué au 14C ont montré que l'éléphon augmentait l'accumulation de 14Cdans les bourgeons de la base et dans les parties proximales des rhizomes. Bien que la proportion de 14C transportée dans le rhizome ne soit pas accrue, cette modification de la distribution du fluazifop-butyl à l'intérieur des rhizomes d'E. repens pourrait limiter la régénération et la reprise de croissance, en particulier à partir des bourgeons de la base. En outre, l'étéphon activait des puits métaboliques non seulement dans le rhizome mais aussi dans le feuillage d'E. repens et pouvait initier des bourgeons qui ne se comportaient pas comme des puits métaboliques.Tant 1'existence que 1'intensité des effets de 1'étéphon sur la phytotoxicité du fluazifop-butyl étaient irréguliers et les raisons possibles en sont discutées. Wirkung einer Vorbehandlung mit Ethephon auf die Reaktion von Elymus repens (L.) Gould auf Fluazifop-butyl In Gewächshausversuchen war die Wuchshem-mung von Elymus repens durch Fluazifop-butyl gelegentlich durch eine Vorbehandlung mil Ethephon verstärkt. Untersuchungen mil 14C-Fluazifop-butyl ergaben, daß Ethephon die Ak-kumulation von 14C in basalen Knospen und proximalen Teilen des Rhizoms förderte. Die so mögliche Veränderung der Verteilung von Fluazifop-butyl in den Quecke-Rhizomen kann zu der reduzierten Regeneration der Pflanzen geführt haben, vor allem aus den basalen Knospen, obwohl insgesamt keine groBere 14C-Menge im Rhizom gefunden wurde. Ethephon aktivierte nicht nur die Sinks im Rhizom, son-dern auch in den oberirdischen Teilen und kon-nte zur Ausbildung von Knospen ohne Sinks führen. Die Wirkungen des Ethephons auf die herbizide Wirkung des Fluazifop-butyls war unregelmaßig, und die moglichen Grunde dafiir werden diskutiert.
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 30 (1990), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Fluazifop-butyl, haloxyfop and sethoxydim with adjuvant oil were applied for three successive growing seasons to established strawberries infested with Elymus repens. The weed was virtually eradicated by three applications of haloxyfop (0.8 kg a.e. ha−1) in successive years. A similar effect was given by five applications of haloxyfop (0.4 kg a.e. ha−1) and fluazifop-butyl (1.6 kg AI ha−1) in three growing seasons. Lower rates of haloxyfop and fluazifop-butyl, and a high rate of sethoxydim (1.6 kg AI ha−1) applied five times were less effective, the ground cover of E. repens shoots not being reduced by the end of the experiment although weight of living rhizome was only 10-30% of that on untreated plots.Fruit yields on treated plots generally reflected the level of E. repens control, but there was some evidence of crop phytotoxicity from herbicide treatments. During the experiment E. repens untreated plots increased from about 30-100% ground cover and reduced yield 13, 28 and 68% in successive years compared with weed-free plots.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 33 (1993), S. 0 
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The possibility of increasing the activity of glyphosate, imazapyr, sulfonylurea herbicides and triclopyr against Rhododendron ponticum L. was investigated using container-grown plants. Glyphosate, imazapyr and triclopyr alone and metsulfuron-methyl with added surfactant were all phytotoxic, imazapyr and triclopyr being the most effective at the doses used. Thifensulfuron-methyl and tribenuron-methyl with ‘Mixture B’ were ineffective. The surfactants ‘Mixture B’ and ‘Silwet L77’ consistently increased the activity of imazapyr and metsulfuron-methyl. Mixtures of the herbicides did not lead to synergistic activity, and mixing imazapyr and triclopyr depressed the activity of each component. There was some enhancement of activity on R. ponticum when imazapyr and metsulfuron-methyl were applied sequentially, 48 h apart. Effets de mélanges d'herbicides et d'adjuvants au Rhododendron ponticumLa possibilité d'accroître l'activité du glyphosate, de l'imazapyr, des sulfonylurées et du triclopyr contre Rhododendron ponticum a étéétudiée en utilisant des plantes cultivées en containers. Le glyphosate, l'imazapyr et le triclopyr seuls et le metsulfuron-methyl additionné d'un surfactant ont tous été phytotoxiques: l'imazapyr et le triclopyr étant les plus efficaces aux doses utilisées. Le thifensulfuron-méthyl et le tribenuron-methyl avec ‘Mixture B’ ont été inefficaces. Les surfactants ‘Mixture B’ et‘Silwet L 77’ ont considérablement augmenté l'activité de l'imazapyr et metsulfuron-methyl. Les mélanges des herbicides n'a pas abouti à une activité synergistique et les mélanges avec l'imazapyr et le triclopyr ont diminué l'activité de chaque composé. Il y a eu un certain renforcement de l'activité sur R. ponticum quand l'imazapyr et le métsulfuron-méthyl étaient appliqués de façon séquentielle, à 48 heures d'intervalle. Wirkung von Herbizidmischungen und Additiven auf Rhododendron ponticumAn Container-Pflanzen von Rhododendron ponticum L. wurden versucht, die Wirksamkeit von Glyphosat, Imazapyr und Sulfonylharn-stoff-Herbiziden zu verstärken. Glyphosat, Imazapyr und Triclopyr allein und Metsulfuron-methyl nach Zugabe von Netzmitteln waren phytotoxisch, besonders Imazapyr und Triclopyr. Thifensulfuronmethyl und Tribenuron-methyl waren mit dem Netzmittel ‘Mixture B’ wirkungslos. Die Netzmittel ‘Mixture B’ und ‘Silwet L77’ erhöhten die Wirksamkeit von Imazapyr und Metsulfuron-methyl durchweg. Mischungen der Herbizide ließen keinen Synergismus erkennen, und die Mischung von Imazapyr mit Triclopyr verringerte die Wirksamkeit der Einzelkomponenten. Die Wirkung auf R. ponticum ließ sich erhöhen, wenn Imazapyr und Metsulfuron-methyl 48 h nacheinander angewandt wurden.
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  • 7
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The Recoil Shadow Anisotropy Method for measuring nanosecond lifetimes is being implemented on the AFRODITE array and four new isomers were found in 198,200Bi, 164Ta and 162Lu.
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  • 8
    ISSN: 1434-601X
    Keywords: 24.10.−i ; 25.40.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Continuum spectra from the reaction197Au(p, p′) at incident energies of 100, 120, 150, 175 and 200 MeV have been measured at scattering angles from 15° to 120°. The angular distributions at representative ejectile energies are compared with a phenomenological parametrization. Reasonable agreement between calculations and experimental data is obtained, but the comparison clearly indicates a need for modification to the parametrization to incorporate a smooth rather than a sharp transition in the energy dependence over the range investigated. This is physically more realistic and is therefore to be expected. The parametrization facilitates the identification of a contribution which behaves in accordance with a quasifree reaction mechanism. The magnitude and angular extent of the quasifree contribution are much larger than that inferred from earlier experiments.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 323 (1986), S. 375-385 
    ISSN: 1434-601X
    Keywords: 27.30.+t ; 23.20.−g ; 21.60.Cs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Properties of levels up to 5 MeV excitation in37Cl were studied with37Cl(p, p′ γ)37Cl,37Cl(α, α′ γ)37Cl and34S(α, pγ)37Cl reactions. Results are discussed with reference to the many-particle shell model with an effective surface delta interaction.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 325 (1986), S. 175-181 
    ISSN: 1434-601X
    Keywords: 25.55.Ci ; 25.70.Ef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The elastic scattering of α-particles from28Si at incident energies between 5 and 12 MeV (4.4 and 10.5 MeV in the centre-of-mass system) was studied to ascertain whether quasimolecular states exist for the α+28Si system, as predicted in the literature in terms of a microscopic theory based on the generator coordinate method. Angular distributions were obtained for angles larger than 70°, in energy steps of 100 keV. Analysis of the experimental data was performed by coherently adding specific resonances to an underlying optical model which describes the background portion of the direct elastic scattering amplitude. As is usual, it was furthermore assumed that the average compound elastic contribution adds incoherently to the total cross section. In spite of the presence of a resonance characterized by an angular momentum value ofJ=3 in the energy region, as required by theory, no evidence could be found for the existence of other resonances with the expectedJ-sequence. We conclude that our experiment and analysis do not support the predictions of the microscopic theory.
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