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  • 1
    Electronic Resource
    Electronic Resource
    Cerebral midline structures in bimanual coordination (1999)
    Springer
    Experimental brain research 128 (1999), S. 243-249 
    Details
    ISSN: 1432-1106
    Keywords: Key words Bimanual movements ; Mesial frontal cortex ; Supplementary motor area (SMA) ; Cingulate motor areas (CMA) ; Functional magnetic resonance imaging (fMRI)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  In six healthy right-handed volunteers, we compared the cerebral activation pattern related to unimanual right- and left-hand movements and to bimanual in-phase and anti-phase movements using functional magnetic resonance imaging (fMRI). Internally paced unimanual finger-to-thumb opposition movements led to a strong contralateral activation of primary sensorimotor areas in all six subjects. Midline activity was lateralized to the left side during right-hand movements, but to both sides during left-hand movements. Activity patterns of bimanual in-phase movements resembled the combined activity patterns of the two unimanual conditions: right and left hemispheric activations of the primary sensorimotor cortices and predominantly left-sided medial frontal activity. In contrast, during anti-phase movements, we observed a clear increase in activity, in both right and left frontal midline areas and in right hemispheric, mainly dorsolateral premotor areas compared to in-phase movements. These results indicate that frontal midline activity is not specific for bimanual movements per se. It can already be involved during simple unimanual movements but becomes progressively more involved during more complex aspects of movement control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050844
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Transport properties of 1,1,1,2-tetrafluoroethane (R134a) (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 951-988 
    Details
    ISSN: 1572-9567
    Keywords: 1,1,1,2-tetrafluoroethane ; correlation ; critical region ; equation of state ; HFC-134a ; R134a ; thermal conductivity ; transport properties ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New equations for the thermal conductivity and the viscosity of R134a that are valid in a wide range of pressures and temperatures are presented. They were obtained through a theoretically based, critical evaluation of the available experimental data, which showed considerable inconsistencies between data sets, in particular in the vapor phase. In the critical region the observed enhancement in the thermal conductivity is well represented by a crossover model for the transport properties of fluids. Since thermodynamic properties enter into the calculation of the critical enhancement of the transport properties, a new fundamental equation for the critical region was developed also.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502117
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Transport properties of 1,1-difluoroethane (R152a) (1996)
    Springer
    International journal of thermophysics 17 (1996), S. 731-757 
    Details
    ISSN: 1572-9567
    Keywords: 1,1-difluoroethane ; correlation ; critical region ; HFC-152a ; R152a ; thermal conductivity ; transport properties ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Based on reliable. carefully selected data sets. equations for the thermal conductivity and the viscosity of the refrigerant R 112a are presented. They are valid at temperatures from 240 to 440 K, pressures up to 20 MPa. and densities up to 1050 kg · m−3. including the critical region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439187
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    Paper (German National Licenses)
    Fulltext
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