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  • Springer  (15)
  • American Institute of Physics (AIP)  (4)
  • 1985-1989  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Energy dissipation in matrix-isolated silver atoms: A time-resolved fluorescence study (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3434-3440 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The fluorescence from optically excited Ag atoms in Ar, Kr, and Xe matrices has been investigated in a time-resolved synchrotron-radiation study. A detailed energy dissipation model could be established from a systematic analysis of rise and decay times of all the observed fluorescence bands after pulsed excitation into the Ag (4d105p)2P1/2,3/2 levels, and by setting time windows between the excitation pulses in emission and emission-yield spectroscopy. Although the overall wavelength dependence of the decay time follows the λ3 law, the decay time is independent of λ within a given emission band. Finally, the role of energy transfer between Ag atoms and dimers for the evaluation of decay times is briefly addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453892
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  • 2
    Electronic Resource
    Electronic Resource
    The optical spectra of matrix-isolated Znn (n≤6) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1147-1151 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optical properties of small Zn clusters, especially of Zn2 and Zn3, isolated in neon have been studied over a wide photon energy range by absorption, emission, and photoelectron spectroscopy. By employing emission yield spectroscopy the optical transitions of the dimer and the trimer could be unequivocally distinguished from those of higher clusters in the matrix. For Zn2, the experimental data compare reasonably well with calculations found in the literature. However, the ground state, which is usually calculated to be nonbinding, is found to be bound. The main absorption bands of at least three more Zn clusters, tentatively assigned to Zn4–Zn6, have been derived from the concomitant growth of bands in a systematic concentration study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452258
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  • 3
    Electronic Resource
    Electronic Resource
    The electronic spectra of matrix-isolated nickel atoms: The coexistence of the 3D3 and 3F4 ground states in Ar, Kr, and Xe (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1623-1630 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic spectra of nickel atoms isolated in matrices of the four noble gases have been assigned in considerable detail. The associated experimental and theoretical study has unequivocally revealed that nickel atoms can simultaneously exist in two electronic ground states, 3d94s1:3D3 and 3d84s2:3F4, in argon, krypton, and xenon matrices where they also occupy at least three different trapping sites. In neon they appear to exist in one site and one state, 3d84s2:3F4, only. In argon, krypton, and xenon matrices the 3D3 is the dominant ground state. Some sites occupied by atoms in the 3F4 ground state can be annealed away, but others are found to be stable to this procedure. The effects of the matrix upon the guest atoms are briefly discussed. It is interesting that only one possible case of band splitting can be identified in the spectra though the observed blue shifts are of the usual magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448394
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  • 4
    Electronic Resource
    Electronic Resource
    The optical spectra of matrix-isolated palladium–nitrogen complexes: An investigation by absorption, emission, and photoelectron spectroscopy (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1348-1354 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optical spectra of palladium in neon and argon matrices containing up to 100% dinitrogen have been studied. Beside the known bands of isolated Pd atoms new strong bands assigned to weakly bonded Pd(N2)m (m=1, 2) complexes appear. The bands are attributed to three different types of transition. The dominant lines are essentially due to transitions localized at the Pd atom but strongly perturbed by a "crystal field'' due to the weakly bonded N2 molecules. Secondly, a vibrational progression at lower energies is assigned to a Pd to N2 charge transfer transition and thirdly, at high energies, a vibrational progression assigned to a locally excited state of an N2 molecule perturbed by weak bonding to Pd is observed. No evidence has been found for the presence of Pd(N2)3. Photoelectron spectra of the Pd(N2)m complexes in neon have been observed. The Pd 4d photoemission peak is shifted with respect to the Pd atom in Ne by ∼1.1 eV to higher binding energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451222
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  • 5
    Electronic Resource
    Electronic Resource
    Aurorae during the Maunder Minimum (1988)
    Springer
    Meteorology and atmospheric physics 38 (1988), S. 246-251 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary Based on a comprehensive review of scientific sources from the 17th and 18th century, a new table of auroras for the years 1645–1705 is presented. Comparison of these data with long-time German recordings (latitude 50 to 55 N) demonstrates that the assumption of the Maunder Minimum is not confirmed by the data of the auroras.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01054577
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of early postnatal exposure to polychlorinated biphenyls (PCBs) on fertility in male rats (1987)
    Springer
    Bulletin of environmental contamination and toxicology 38 (1987), S. 946-953 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01609078
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  • 7
    Electronic Resource
    Electronic Resource
    Microbeam analysis of Ca exchange and uptake in the fine roots of spruce: influence of pH and aluminum (1988)
    Springer
    Trees 2 (1988), S. 96-103 
    Details
    ISSN: 1432-2285
    Keywords: Aluminum ; Calcium ; Fine roots ; Microbeam analysis ; Picea abies ; Soil acidification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A novel stable isotope labelling procedure for microbeam analysis was developed to monitor exchange and uptake of nutrients, primarily Mg, K and Ca, by root tips at the cellular level. Initially root samples were analysed from 2-year-old spruce trees, originating both from a nursery and from a polluted forest site, (1) for the cortex cell wall accessibility and nutrient binding properties, (2) for the influence of low pH and elevated aluminum concentrations on Ca binding to cortex cell walls, and (3) for long-range transport into the secondary xylem, proximal to the labelled root tip. In nursery control plants, Ca is localized mainly in the apoplast of the cortex. Exchange of Mg, K, Ca in the cell wall of the cortex and the primary xylem with label in incubation solutions is almost completed to equilibration within 30 min. In the secondary xylem we could detect Mg, K, and Ca from labelling solutions in minute amounts after 30 min, and as a major fraction after 48 h. This indicates that stable isotope labelling can be used to study both ion-exchange properties of the apoplast and long-range transport. Slight acidification of the labelling incubation media to pH 4.5 reduced Ca binding to the cortex cell walls slightly, but acidification to the extreme value of pH 2.3 reduced binding 41%. A combination of pH 4.5 and increased free aluminum reduced the binding by 83%. In a preliminary attempt to analyse the nutrient binding capability of the root-tip apoplast from pollution affected trees, we exposed fine roots of 2-year-old spruce from an acidified and polluted site showing typical low levels of Ca and Mg in the cortical cell walls to Ca-enriched media. Under these conditions the Ca content of cortex cell walls doubled upon incubation at pH 4.7, reaching 40% of the total binding capacity of our nursey control plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196755
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  • 8
    Electronic Resource
    Electronic Resource
    AnO(N) algorithm to automatically generate geometric triangulations satisfying the Delaunay circumsphere criteria (1989)
    Springer
    Engineering with computers 5 (1989), S. 177-193 
    Details
    ISSN: 1435-5663
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract This paper presents an algorithm for the generation of Delaunay triangulations for general nonmanifold geometric models. Octree concepts are used for point placement and providing the linear, with respect to the number of elements, growth rate of the algorithm. Compatibility and classification procedures are used in conjunction with point injection procedures to ensure that the final Delaunay triangulation is a geometric triangulation of the domain of interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274211
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  • 9
    Electronic Resource
    Electronic Resource
    Low-divergence operation of a long-pulse excimer laser using a SBS phase-conjugate cavity (1989)
    Springer
    Applied physics 48 (1989), S. 351-356 
    Details
    ISSN: 1432-0649
    Keywords: 42.55G ; 42.60D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The use of an optical cavity containing a stimulated Brillouin scattering (SBS) phase-conjugate reflector to control the spatial and spectral output of a long pulse (〉100 ns) X-ray preionized XeCl laser is reported. The divergence of the 3×4 cm2 output beam has been improved by a factor of ∼20 to 〈150 μrad. The temporal form of the output depends on the acoustic decay times of the liquid and gaseous SBS media used. Four-wave mixing via gain saturation has been observed within the discharge volume, leading to depolarisation of the output beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694193
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  • 10
    Electronic Resource
    Electronic Resource
    Haarwechsel als Konditionsindex für Gamspopulationen(Rupicapra rupicapra) (1987)
    Springer
    European journal of wildlife research 33 (1987), S. 213-220 
    Details
    ISSN: 1439-0574
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The report presents a study using moulting as an indicator of condition in chamois populations. Two populations in the Bavarian Alps, known to be in different condition, formed the basis of the data. Regular observations of the spring moult revealed in each case the proportion of females and males which had begun to moult or had already completed moulting. The spread over time of the beginning of the moult follows a sigmoid function. The course of the moult is modelled using a logistic regression analysis. Regression coefficients and average date of the beginning of the moult were compared between the populations using a likelihood-quotient-test. The possibilities and limits of using the method are discussed. The beginning of the moult in both females and males was earlier in populations which were in better physical condition. The difference was shown to be significant only for the females. The results show that the time of the beginning of the moult can be used as an indicator of condition for chamois populations.
    Abstract: Résumé On présente une méthode permettant d'utiliser la mue du pelage comme indicateur de condition physique pour les populations du Chamois. Deux populations des monts Ammer, différemment conditionnées, livrèrent les données de base à ce sujet. L'observation régulière de la mue du pelage au printemps permet de distinguer la progression différentielle du phénomène chez les mâles et les femelles. La dispersion dans le temps du début de la mue suit une courbe sinusoïde. Son déroulement est décrit au moyen d'une analyse de régression logistique. Les coefficients de régression et l'époque moyenne du début de la mue ont été comparés au moyen d'un test de quotients de similarité entre les deux populations. Les possibilités offertes par ce test ainsi que ses limites font l'objet d'une discussion. Tant pour les mâles que pour les femelles des populations se trouvant en bonne condition physique, les dates du début de la période de mue étaient plus précoces; cette différence ne peut cependant être vérifiée de façon significative que pour les femelles. Les résultats montrent que le moment auquel débute la mue de pelage constitue un indice valable de la condition des populations de chamois.
    Notes: Zusammenfassung Eine Methode zur Verwendung des Haarwechsels als Konditionsweiser für Gamspopulationen wird vorgestellt. Zwei verschieden konditionierte Populationen im Ammergebirge waren die Datenbasis. Bei regelmäßigen Beobachtungen des Frühjahrshaarwechsels wurde jeweils der Anteil an Gei\en bzw. Böcken ermittelt, der den Haarwechsel begonnen oder bereits beendet hatte. Die zeitliche Streuung des Haarwechselbeginns in der Population folgt einer sigmoiden Funktion. Der Verlauf wird mit einer logistischen Regressionsanalyse beschrieben. Regressionskoeffizienten und durchschnittlicher Zeitpunkt des Haarwechselbeginns wurden mit einem Likelihood-Quotiententest zwischen den Populationen verglichen. Möglichkeiten und Grenzen des Testverfahrens wurden diskutiert. Die Anfangszeitpunkte des Haarwechsels lagen für Geißen wie Böcke in der besser konditionierten Population früher, der Unterschied konnte mit dem Testverfahren nur für die Geißen signifikant nachgewiesen werden. Die Ergebnisse zeigen, daß der Zeitpunkt des Haarwechselbeginns als Konditionsindex für Gamspopulationen brauchbar ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02241445
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