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  • 1985-1989  (7)
  • 1988  (7)
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  • 1985-1989  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Quantal detection and homogeneous sensitivity in a pentylenetetrazol discrimination (1988)
    Springer
    Psychopharmacology 94 (1988), S. 183-187 
    Details
    ISSN: 1432-2072
    Keywords: Drug discrimination ; Pentylenetetrazol ; Operant behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Rats were trained to discriminate pentylenetetrazol (PTZ, 20 mg/kg) from saline in a two-lever operant task. Correct lever presses were reinforced with food under the control of a fixed ratio 10 schedule. In tests of the effect of PTZ dose on level selection, rats selected the PTZ lever in a dose-dependent manner, with peak latency at the approximate ED50 dose (10 mg/kg). Rats usually pressed only the selected lever, regardless of dose, indicating that lever selection was a quantal (or bimodal) function of stimulus intensity. Lever biases observed during training sessions did not predict the performance of individual rats in tests with the ED50 dose. In three independent trials with this intermediate dosage, the rats selecting the PTZ lever varied from trial to trial, suggesting that rats detecting this dose did not form a stable subgroup. The pattern of lever selections across these three trials was not significantly different from that predicted by a model in which all subjects shared the same probability for detecting the drug stimulus. These results demonstrate that lever selection in a two-lever drugdiscrimination task can be quantal in nature, and suggest that rats trained with PTZ, 20 mg/kg, are homogeneous in sensitivity to this stimulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176842
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Some new data on lithium sulphate (1988)
    Springer
    Journal of materials science 7 (1988), S. 425-427 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730765
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Electrical conductivity and thermoelectric power of the system (1 −x)Li2WO4-xLi2MoO4 (1988)
    Springer
    Journal of materials science 7 (1988), S. 309-310 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730726
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electrical conduction in non-metallic rare-earth solids (1988)
    Springer
    Journal of materials science 23 (1988), S. 919-923 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Schematic energy band diagrams for the genesis of charge carriers in non-metallic rare-earth solids have been presented. It has been shown that positions of 4f bands have significant effect on the genesis and nature of charge carriers, their conduction mechanism and magnitude of electrical conductivity (σ) and Seebeck coefficient (S) of the solid. Relevant relations have been given for bothσ and S in different situations. Experimental data on rare-earth sesquioxides (R2O3), rare-earth tungstates [R2(WO4)3] and rare-earth molybdates [R2(MoO4)3] in the intrinsic range have been explained as examples for the validity of energy band diagrams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153989
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Electrical conduction in narrow band trivalent transition metal tungstates (1988)
    Springer
    Journal of materials science 23 (1988), S. 924-927 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The measurements of electrical conductivity (σ) and Seebeck coefficient (S) of trivalent transition metal tungstates M2(WO4)3 with M = Cr, Fe and Ni have been reported in the temperature range of 450 to 1250 K. The results have been explained on the basis of a schematic energy band diagram appropriate for these solids. The estimated value of the energy band gap is slightly more than 3 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153990
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Defects and electrical conduction in mixed lanthanum transition metal oxides (1988)
    Springer
    Journal of materials science 23 (1988), S. 1725-1728 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Lanthanum and transition metal mixed oxides form an interesting series of compounds with a general formula LaMO3 (with M = Ti, V, Mn, Cr, Co, Ni and Fe). These compounds have been investigated by many workers as regards to their various physical parameters including the electrical conductivity. The new data reported in this paper refer to the Seebeck coefficient (S) in the temperature interval 300 to 1250 K. Electrical conductivity as a function of temperature has also been reported in the same temperature range and this is quite consistent with the values reported in the literature. Using these and other relevant data reported in the literature it has been concluded that native defects are mainly responsible for the electrical conduction in these solids. The nature of defect centres, charge carrier and their electrical transport mechanism is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01115712
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Ionic and electronic conductivity in some simple lithium salts (1988)
    Springer
    Journal of materials science 23 (1988), S. 4257-4262 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The electrical conductivity (σ) and thermoelectric power (S) of Li3VO4, Li3PO4 and Li3BO3 solidified melts are presented in the temperature range from 415 K to the melting point of each solid. The ionic (σ i,) and electronic (σ e) contributions toσ have been separated over the entire temperature range with the help of a time-dependence study of the d.c. electrical conductivity. Superionic phases in all three solids have been observed below their melting points in which the conductivity is almost purely ionic. The value of the phase transition temperature below which the solid transforms from superionic to normal phase has been obtained. It has been shown that in the normal phase, these solids are mixed conductors. Data for the temperature variations of bothσ i, andσ e are also presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551916
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    Paper (German National Licenses)
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