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  • Articles: DFG German National Licenses  (8)
  • 1990-1994  (8)
Source
  • Articles: DFG German National Licenses  (8)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    A remark on the Hamiltonian form of the magnetic-field-line equations (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 208-209 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is frequently assumed that a solenoidal vector field u in a simple toroid may be represented in the form of u=∇Ψ×∇φ+∇χ×∇θ with appropriate toroidal angle φ, poloidal angle θ, and two fluxes Ψ and χ. This expression allows one to write the field-line equations in a Hamiltonian form [Phys. Fluids 26, 1288 (1983)]. It is proved on a rigorous mathematical basis that every solenoidal field in an arbitrary smooth simple toroidal domain can be written in the above form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870552
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Anomalous transports associated with the helicity transport in a plasma (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 3059-3064 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Heat and particle transports which are associated with the helicity transport are obtained in a current-carrying plasma. The helicity flux represents the transport of parallel current density and is produced by an electric field with a circularly polarized component. Fluctuations with circularly polarized components induce finite average in cross-field nonlinear parallel current, which leads to generation of frictional electron heat flux as well as ion nonlinear polarization current that produces particle flux. The circular polarization of the perturbed electric field thus relates the helicity flux, electron heat flux, and the particle flux in such a manner that the heat and the particle transports in the direction opposite to the helicity flux. This result applies whether the helicity is injected externally by oscillating fields or it is generated internally in the plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859785
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Production of superthermal electrons and ion cyclotron waves in a reversed-field-pinch plasma (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3261-3266 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Production of superthermal electrons through kinetic interactions with electromagnetic fluctuations is studied to account for observations of fast electrons and ion cyclotron waves in reversed field pinch plasmas. Low-frequency Alfvénic (torsional) modes can interact with electrons through the Landau resonance when the wavelength perpendicular to the magnetic field is as small as the ion gyroradius. Such kinetic Alfvén waves induce simultaneous diffusion (double diffusion) in the coordinate and velocity spaces, and produce a field aligned superthermal electron beam in the edge region. Microinstabilities are driven by the electron-beam and ion cyclotron waves are excited. Through these precesses the fluctuation energy in the low-frequency regime may be transported to the ion cyclotron frequency regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860662
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Transit-time magnetic pumping induced by spontaneous fluctuations in a magnetohydrodynamic relaxation process (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3013-3015 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the magnetohydrodynamic relaxation accompanying fast reconnections, magnetic fluctuations originating from kink-type instabilities yield a finite magnetic compression, and the corresponding transverse electric field is dissipated through transit-time damping. This dissipation mechanism does not change the helicity, while it dissipates the fluctuation energy to result in direct heating of ions. This is in contrast to a slow relaxation process based on the tearing mode turbulence, where the parallel electric field is predominantly dissipated, which accompanies preferential heating of electrons and dissipation of the helicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860412
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A Novel Mushroom Pigment: Isolation and Characterization (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 8849-8850 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00098a071
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Synergistic extraction of americium(III) with 2-thenoyltrifluoroacetone and crown ethers (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 160 (1992), S. 435-442 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Extracton, of Am3+ in benzene with 2-thenoyltrifluoroacetone (HTTA) and crown ethers (CEs) such as 15-crown-5, 18-crown-6, dicyclohexano-18-crown-6, dibenzo-18-crown-6, dicyclohexano-24-crown-8, and dibenzo-24-crown-8 was investigated. Synergistic effect by CE was observed regardless of the kind of CE examined. The extracted species was found to be Am(TTA)3(CE), and adduct formation constants between Am(TTA)3 and CE in the organic phase were determined. The sequence of constant could not be explained only by basicity of CE and the steric effect of CE should be taken into account to elucidate the adduct complex formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037118
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Spectroscopic study of the uranyl hydrolysis species (UO2)2 (OH) 2 2+ (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 174 (1993), S. 299-314 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The behavior of (UO2)2(OH) 2 2+ has been investigated in solid-liquid equilibria under 100%, 8%, 1%, 0.3% and 0.03% CO2 partial pressure as well as in undersaturated systems in equilibrium with air at 24±2°C in 0.1M NaClO4 solutions. From spectroscopic investigations by UV-Vis-and time-resolved laser-induced fluorescence (TRLF) spectroscopies, single component absorption and emission spectra are suggested for the (UO2)2 (OH) 2 2+ species. The lifetime τ22 of the fluorescence emitting electronically excited state of (UO2)2(OH) 2 2+ was determined as τ22 = 2.9 ± 0.9 μs. The formation constant of (UO2)2(OH) 2 2+ was found to be log K22=−5.97 ± 0.06. Interpretation of the experimental data was also made assuming the species (UO2)2(OH) 2 2+ , but unsatisfactory results have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037917
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Electrode processes of plutonium ions in phosphate media (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 340 (1991), S. 403-409 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The electrolytic behaviour of plutonium ions in a mixture of phosphate and nitrate solutions was studied by flow-coulometry with column electrodes of glassy carbon(GC)-fibers and voltammetry with a GC disc electrode, and compared with that in phosphate-free media. The redox processes, PuO 2 2+ /PuO 2 + and Pu4+/Pu3+, were demonstrated to be reversible even in the phosphate media and their half wave potentials shifted more negatively due to the formation of PuO2(H2PO4)+ and Pu(HPO4)2. The rate of the irreversible reduction of PuO 2 + to Pu3+ increased in the presence of phosphoric acid and the quantitative reduction was attained with the column electrode even at +0.35 V vs. saturated KCl-Ag/AgCl. The reduction process of PuO 2 + was elucidated considering an intermediate Pu(IV)-species, PuO2+, which decomposed into Pu4+ by a post-chemical reaction. Analytical advantages of the use of phosphate media are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322411
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    Paper (German National Licenses)
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