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  • 1995-1999  (4)
  • 1965-1969  (3)
  • 1920-1924
  • 1996  (4)
  • 1969  (3)
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  • 1995-1999  (4)
  • 1965-1969  (3)
  • 1920-1924
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  • 1
    Electronic Resource
    Electronic Resource
    Dynamics of a multiple-pulse-driven x-ray laser plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 606-613 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we describe experimental and computational studies of multiple-pulse-driven laser plasma, which is the gain medium for a neon-like yttrium x-ray laser. Near-field emission profiles have been measured both with and without reinjection of the x-ray laser photons to couple with the amplifying medium created by later pulses using an external multilayer mirror. From the temporal and spatial evolution of the near-field emission profiles we can examine the pulse-to-pulse variation of the x-ray laser plasma due to changes in the hydrodynamics, laser deposition, and the injecting of x-ray laser photons back into an amplifying x-ray laser plasma. Using a combination of radiation hydrodynamics, atomic kinetics, and ray propagation codes, reasonable agreement has been obtained between simulations and the experimental results. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871888
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Bauxite Mine Restoration Operations on Topsoil Seed Reserves in the Jarrah Forest of Western Australia (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Restoration ecology 4 (1996), S. 0 
    Details
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We studied the effects of soil handling operations during bauxite mining and restoration on the numbers and depth distribution of seed stored in the surface soil of the jarrah forest. Germinable seed stores were determined in four sites of undisturbed forest, these same sites after clearing and burning of forest residues, in the soil immediately following the construction of topsoil stockpiles, in the respread topsoil and then after deep ripping of the respread topsoil. Average density of germinable seed at four sites prior to disturbance was 352 m−2. After clearing and burning, the seed store had decreased to a mean 74% of the original forest soil seed store density. When the top-soil was stockpiled prior to respreading, the seed content was further reduced to 31% in freshly constructed stockpiles and had declined to 13% after 10 months in the stockpiles. After ripping of the respread topsoil the seed content was 16% of the original forest seed store density. In one site where the topsoil was directly stripped and respread with no period of stockpiling but with a period of fallow, the seed store was 32% after respreading and then increased to 53% of the original forest store after ripping. This increase may have been caused by an underestimate of the reserves due to insufficient heating of the samples to break dormancy in fire-requiring species. In the forest topsoils seed was concentrated in the upper few centimeters of the soil profile, whereas after the mining and restoration operations seed was evenly distributed throughout the returned soil profile to a depth of 20 cm. Small-seeded annual species, which were common in the forest seed store, were more sensitive to the soil handing operations and declined to very low numbers, whereas hard-seeded plant species such as Acacia spp. were less affected by the soil handling operations. Implications for bauxite mine revegetation operations include the recommendation that direct return of topsoil should be carried out wherever possible with a minimum delay between clearing, stripping, respreading, and ripping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1526-100X.1996.tb00189.x
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  • 3
    Electronic Resource
    Electronic Resource
    The Effect of Timing of Rehabilitation Procedures on the Establishment of a Jarrah Forest After Bauxite Mining (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Restoration ecology 4 (1996), S. 0 
    Details
    ISSN: 1526-100X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The restoration of the high botanical diversity of the premining jarrah (Eucalyptus marginata) forest is a major priority of rehabilitation following bauxite mining in southwestern Australia. This study investigated the effects of different ripping, seeding, and scarifying dates on the establishment of plants from propagules stored in the topsoil and from applied seed on areas being rehabilitated after mining. Seed stored in the topsoil, rather than applied seed, was the major contributor to plant diversity. Ripping late (April) or scarifying in June significantly reduced the number of species and numbers of individual plants that established from propagules in the topsoil. Species originating from broadcast seed were most numerous when the seed was broadcast in April or after scarifying in June. Scarifying before seeding, particularly in June, increased the establishment of species from the broadcast seed. To make best use of the applied seed, without jeopardizing the establishment of species from the topsoil, pits should be ripped and sown by April. We list a number of strategies that can help maximize plant numbers and botanical diversity on rehabilitated bauxite mines, which may also be of more general application for restoring the original native vegetation on disturbed sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1526-100X.1996.tb00103.x
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  • 4
    Electronic Resource
    Electronic Resource
    Massenbeziehungen zwischen Baryonen mitJ P=1+/2 und 3+/2, hergeleitet aus den Bindungsenergien der Quark-Teilchen (1969)
    Springer
    The European physical journal 228 (1969), S. 322-328 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper is based on the non-relativistic three quark model of the baryons including mass differences depending on the electromagnetic as well on the hypercharge. Assuming that the binding energies between two quarks in the baryons are the well known linear combinations of the binding energies we verify different mass formulas between the baryons. Some ones can be verified without additional assumptions, other ones only by supposing relations between the binding energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01406714
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  • 5
    Electronic Resource
    Electronic Resource
    On the determination of electron relaxation times and specularity of surface scattering from surface state resonances (1969)
    Springer
    The European physical journal 9 (1969), S. 146-157 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract On hand of a “minimal theory” we derive a description of electrons in skipping trajectories as a system of quantum-mechanical bound states. Impedance oscillations observed in Cu are discussed in terms of transitions between such surface quantum states. We focus attention on the determination of electron relaxation times and specularity of surface scattering from the theoretical analysis of impedance oscillation spectra. The temperature dependence of amplitude and linewidths observed in Ga illustrate the effect of relaxation time on the resonances. Electron reflection from roughened surfaces in Sn is shown to be increasingly non specular with increasing angle of incidence to the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422545
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  • 6
    Electronic Resource
    Electronic Resource
    The provision of services for rural youth with serious emotional and behavioral problems: Virginia's comprehensive services act (1996)
    Springer
    Community mental health journal 32 (1996), S. 481-495 
    Details
    ISSN: 1573-2789
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The problems of the delivery of mental health and social services to rural children and adolescents encapsulate many of the problems in the larger health care system. Consequently, many of the principles underlying the President's Health Security Plan are applicable to the reformation of this more specialized service system. The experience of the Commonwealth of Virginia in implementing the Comprehensive Services Act (CSA) highlights the scope of vision needed to transform an existing service delivery system into a coordinated system of care on a state-wide scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02251047
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  • 7
    Electronic Resource
    Electronic Resource
    Neue Derivate des Pyridazins (1969)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 286-295 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das neuerdings leicht zugängliche 3-Amino-4-hydroxy-6-methy1-pyridazin 1 [1] erschließt einen neuen Zugang zu Derivaten des Pyridazins. Die Umsetzung mit salpetriger Säure liefert in verdünnter Schwefelsäure 3,4-Dihydroxy-6-methyl-pyridazin 3, in konz. Salzsäure dagegen 3-Chlor-4-hydroxy-6-methylpyridazin 2. Das Chloratom in 2 ist leicht nucleophil ersetzbar unter Bildung der 3-Hydroxy-, 3-Amino- bzw. 3-Phenylthio-Verbindungen 3, 7a-i. Noch leichter reagieren die entsprechenden 4-Methoxyverbindungen, so daß auch die interessanten3-Arylsulfonylamino-4-methoxy-Derivate 8k, l gut zugänglich sind.Mit Phosphoroxidchlorid liefert 2 das 3,4-Dichlor-6-methyl-pyridazin 10, das - ebenso wie 2 - in Gegenwart von Palladium reduktiv enthalogeniert werden kann, wobei 3-Methyl-pyridazin 11 bzw. das bisher unbekannte 4-Hydroxy-6-methyl-pyridazin 9 entstehen. Die Umsetzung des 3-Amino-4-hydroxy-6-methyl-pyridazins 1 mit Dimethylsulfat führt nur zum 4-Methoxy-Derivat 4. In gleicher Weise reagieren die 4-Hydroxy-6-methylpyridazine 7a-i und 2. Die Struktur der dargestellten Verbindungen wird gesichert. Die Verbindungen mit 4-Hydroxygruppe zeichnen sich durch hohe Schmelzpunkte, relativ geringe Löslichkeiten in Wasser und damit zusammenhängend sehr stark assoziierte IR-Banden der OH-Gruppe aus.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19693110214
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