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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of the Stark broadening and shift parameters for several ultraviolet lines of singly ionized aluminum (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4752-4758 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Stark broadening parameters of the 1990.53, 2631.55, 2669.17, 2816.18, 3900.68, and 5593.23 A(ring) lines of Al(II) have been measured in a plasma produced by ablation with a Nd:YAG laser of an aluminum target. In order to obtain suitable experimental conditions for the homogeneity and stability of the plasma a study of the spatial and temporal plasma evolution in helium, argon, and nitrogen at different pressures was made. The broadening parameters were obtained with the aluminum target placed in molecular nitrogen at 1000 mbar, which provides appropriate measurements conditions. The Al(II) 4663.05 A(ring) line was used to determine the electron density in all cases. For this line the Stark shift parameter has been measured. Contributions to broadening arising from mechanism different than Stark broadening were estimated for every studied line.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353839
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  • 2
    Electronic Resource
    Electronic Resource
    Constant current corona triode with grid voltage control. Application to polymer foil charging (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1143-1150 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new version of a corona triode setup, allowing charging dielectric foils with a constant current, was developed. The charging current is kept constant by controlling the grid voltage. We show that the sample surface potential can be inferred from the grid voltage and present results of the uniformity of charge deposition during the charging procedure. Sample charging currents could be varied from 1 to 300 nA/cm2 and the foils could be charged up to ±6 kV. The method was applied to measure the potential buildup on Teflon FEP and PVDF samples and these results are discussed. They showed that the method can be successfully applied to study the polarization buildup of β-PVDF foils under corona charging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141438
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  • 3
    Electronic Resource
    Electronic Resource
    Conformational analysis of some 1,4-dioxepane systems. 2. Methoxy-1,4-dioxepanes (1990)
    s.l. : American Chemical Society
    The @journal of organic chemistry 55 (1990), S. 6018-6023 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00311a020
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  • 4
    Electronic Resource
    Electronic Resource
    Faulting process of the 1990 June 20 Iran earthquake from broadband records (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 118 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We study the rupture process of the Iranian earthquake of 1990 June 20 from broad-band data. We redetermined its moment tensor and source mechanism from long-period surface waves. Then we studied the P and SH broad-band recordings from the GEOSCOPE and IRIS seismic networks. We inverted the body waves using a full waveform modelling. For the inversion we used the gradient method of Nábělek, mixed with a limited exploration of the parameter space. In order to control the resolution of inversion, we proceeded by a stepwise procedure increasing the model complexity with every new inversion. We used the reduction of cost functional as a criterion for the validity of the inverted model. We first inverted the body waves considering a single-point source model. We found that body waves are dominated by a large energy release about 20 s from the onset of the signals. In the next step, fixing fault-plane solution, we inverted for the directivity of the source. We found clear evidence of propagation towards the east of the epicentre. We determined a rupture velocity of ∼2.5km s−1. The preceding source inversion reduced the variance of the residuals by about 30 per cent. Further improvement of the fit of the body-wave signals was obtained using an extended line source with constant fault-plane solution. We obtained a very good fit with an asymmetrical model. Initially rupture is bilateral but north-western propagation stops after 10 s. Later rupture continues unilaterally in the south-eastern direction with a rupture velocity of the order of 2.5 km s−1. Finally an inversion was attempted with a line source with varying fault mechanism. The final solution obtained by this procedure reduces the variance of the body-wave residuals by 60 per cent with respect to the variance of the observed body-wave signals. Variations in fault-plane solution along the fault are considered to be well resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb04673.x
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  • 5
    Electronic Resource
    Electronic Resource
    Alboran Sea late cenozoic tectonic and stratigraphic evolution (1992)
    Springer
    Geo-marine letters 12 (1992), S. 179-186 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Analysis of airgun seismic profiles from the Alboran Sea reveals a complex morphostructure with margins, basins, and structural highs. North of the Alboran Ridge, south-facing margins have a passive style of evolution, with thick progradational sequences of post-Messinian deposits, whereas north-facing margins are tectonized along structural highs with reduced sediment cover. Basins are extensional features developed since the Early Miocene by mechanisms of tectonic escape and pull-apart, under generalized northwest-southeast to north-south compression. Depositional sequences in this semi-land-locked sea were controlled by the local tectonism and influenced by global sea-level oscillations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02084930
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  • 6
    Electronic Resource
    Electronic Resource
    Post-Messinian evolutional patterns of the central Alboran Sea (1992)
    Springer
    Geo-marine letters 12 (1992), S. 173-178 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The northern Alboran Ridge margin depicts fault-bounded, structural blocks tilted downward to the basins. Post-Messinian sequences fill depressions on these blocks with thick depositional wedges thinning basinward. A change in the stress field after the Early Pliocene produced structural inversions and generalized uplifting of the Alboran Ridge from the Late Pliocene to Recent time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02084929
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of polyamines on stabilization of molecular complexes in thylakoid membranes of osmotically stressed oat leaves (1993)
    Springer
    Planta 189 (1993), S. 201-206 
    Details
    ISSN: 1432-2048
    Keywords: Polyamine ; Ribulose-1,5-bisphosphate carboxylase/oxygenase (large subunit) ; Thylakoid membrane (stabilization) ; Thylakoid protein (D1, D2, cytochrome f)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Monocotyledonous leaves subjected to osmotica used for protoplast isolation accumulate a massive amount of putrescine (Put), lose chlorophyll and senesce rapidly. Treatment with spermidine (Spd) or spermine (Spm) prevents the loss of chlorophyll, indicating preservation of the thylakoid membranes at the site of the chlorophyll-protein complexes. Using several recently produced antibody probes, the effects on the stabilization of thylakoid membranes of applying either difluoromethylarginine (DFMA), a specific inhibitor of putrescine synthesis via arginine decarboxylase, or the polyamines Spd, Spm, or diaminopropane (Dap) to osmotically shocked oat leaves (Avena sativa L.) have been investigated. High protein levels were maintained in thylakoid membranes of leaf tissue incubated in the dark in the presence of 0.6 M sorbitol when pretreated with DFMA. After 48 h incubation, the level of the thylakoid protein D1, at the core of photosystem II, was higher in the DFMA-pretreated leaves as was the stromal protein ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco; as indicated by the level of large subunits). Applications of Spd, Spm or Dap were effective in retarding the loss of D1, D2 and cytochrome f from the thylakoid membranes as well as Rubisco large subunits and chlorophyll from the leaf tissue. The effects of polyamine applications may be mediated through Dap since most of the added Spd or Spm was converted to Dap within 6 h. The possible mechanisms of action of polyamine applications and DFMA-pretreatment on stabilizing the composition of the thylakoid membrane are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195077
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  • 8
    Electronic Resource
    Electronic Resource
    Recent advances in the understanding of polyamine functions during plant development (1993)
    Springer
    Plant growth regulation 12 (1993), S. 331-340 
    Details
    ISSN: 1573-5087
    Keywords: polyamines ; putrescine ; spermidine ; spermine ; ethylene ; ACC ; RNA ; DNA ; protein synthesis ; enzyme activities ; membranes ; free radicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Suggested roles for polyamine function, and the evidence for these functions, is reviewed. These include membrane stabilization, free radical scavenging, effects on DNA, RNA and protein synthesis, effects on the activities of RNase, protease and other enzymes, the interaction with ethylene biosynthesis, and effects on second messengers. It is concluded that in addition to interacting with plant hormones, polyamines are able to modulate plant development through a fundamental mechanism(s) common to all living organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027215
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  • 9
    Electronic Resource
    Electronic Resource
    Muon level crossing resonance in aluminium (1994)
    Springer
    Hyperfine interactions 85 (1994), S. 59-65 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cross relaxation between implanted positive muons and27Al nuclei in Al metal, lightly doped with Cu to impede the muon diffusion, shows weak resonances at 2.3 and 4.0 mT. Assignment of these to polarization transfervia the 1/2 ↔ 3/2 and 3/2 ↔ 5/2 transitions of the (J=5/2) spins leads to a quadrupole coupling constante 2qQ/h=1.8(1) MHz,i.e. an electric field gradient on Al nuclei immediately adjacent to the muon siteq=0.048(3) a.u., with a small departure from axial symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069402
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  • 10
    Electronic Resource
    Electronic Resource
    SnS—Sno2 conversion of chemically deposited SnS thin films (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 1 (1992), S. 117-121 
    Details
    ISSN: 1057-9257
    Keywords: Tin(II) sulphide ; Tin(IV) oxide ; Photoconductor ; Air annealing ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The thermal decomposition of chemically deposited SnS thin films to SnO2 films by air annealing at temperatures up to 400°C is discussed. The conversion of a 0.7 μm thick SnS thin film to an SnO2 film involves the creation of non-stoichiometric SnS, SnS + SnS2 mixed phase and non-stoichiometric SnO2 (i.e. SnO2 — x), as concluded from X-ray diffraction patterns, optical transmission spectra and electrical characteristics. The SnO2 thin films obtained in this manner are photoconductive, with a lowest sheet resistance (in the dark) of about 105 Ω/□ and an activation energy (Ea) of 0.1 eV for the electrical conductivity observed for the SnS films annealed at 325°C. This was found as the onset temperature for conversion of the SnS + SnS2 phase to the non-stoichiometric SnO2 - x film. Elevation of the annealing temperature to 400°C results in an elevation of the sheet resistance to about 109 Ω/□ with the value of Ea at 1.3 eV, indicating an improvement in the degree of stoichiometry.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860010303
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