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  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear behavior of radiative modes in noncoronal equilibrium (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2567-2576 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear evolution of radiative modes with the effects of finite recombination time were studied in a uniformly magnetized quasi two-dimensional plasma. In the one-dimensional limit, it was found that a plasma in noncoronal equilibrium (impurities evolve at a slower rate than the temperature), radiative modes were modestly more stable and evolved at a slower rate. A new unstable state was found in which the plasma initially cooled, only to grow unstable to the radiative condensation mode. This nonlinearly unstable regime has a stability boundary an order of magnitude higher than that predicted by linear theory. For a parameter regime appropriate to the tokamak edge, the nonlinear condensation mode proved to be more unstable in noncoronal equilibrium than in coronal equilibrium. When two-dimensional effects were added, little difference was found in the behavior of the mode in coronal equilibrium, but in noncoronal equilibrium, a new state evolved in which the condensation initially grew, but then flattened as the plasma continued to heat at a constant rate. The results provide insight as to why condensations are observed in tokamaks when they are seemingly stable to condensation modes. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872235
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  • 2
    Electronic Resource
    Electronic Resource
    Three-dimensional simulations of the parallel velocity shear instability (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 300-309 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear mode structure and anomalous momentum transport of the electrostatic parallel velocity shear instability in a uniformly magnetized slab were studied using three-dimensional (3-D) nonlinear fluid simulations. Within this simplified model, the system depends upon two dimensionless parameters α=2πqRρs/Lv2, which is a ratio of the sound transit time to the linear growth time of the mode and ρ(circumflex)=ρs/LV, which is a ratio of the ion Larmor radius and the radial scale length of the parallel velocity profile. In the limit of ρ(circumflex)=0, the mode structure evolved nonlinearly to a state with m=2/α and n=1 for α〈1, and m=2 and n=α for α〉1 where m is the poloidal mode number and n is the toroidal mode number. The transport had a value of D∼ρscs/2 for all α. For ρ(circumflex)≠0 the system displayed a different saturated state, evolving to m=1 and n=α/2 for all α. The transport remained D∼ρscs/2 for all α. The effect of the Larmor radius is this 3-D system is similar to the well known inverse cascade in a two-dimensional incompressible fluid. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872090
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  • 3
    Electronic Resource
    Electronic Resource
    On the life history of the lesser gurnard (Scorpaeniformes: Triglidae) inhabiting the Agulhas Bank, South Africa (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Growth analysis based on sectioned sagittal otoliths revealed the lesser gurnard Chelidonichthys queketti on the Agulhas Bank to be relatively fast growing and long lived, with ages of up to 7 years being recorded. Total length at age (mm) was described best by the specialized von Bertalanffy growth model as LT=306·1 (1 − e0·53(t+0·18)). First approximations of total, natural and fishing mortality rates were determined at 0·73, 0·38 and 0·35 year−1 respectively. The adult population was male dominated with a sex ratio of 1 female: 1·2 males with the mean size of males and females being similar. The lesser gurnard is an iteroparous species with females maturing by the end of the first year of life (195 mm LT), thereafter spawning throughout the year with reproductive activity peaking over spring and late summer. The lesser gurnard appears to exhibit similar life-history patterns to other triglid species in that it can be classified as a generalist. Generalistic life-history characteristics such as a fast growth rate, early sexual maturity at a relatively large size, a non-seasonal spawning pattern, feeding on a variety of prey organisms and the ability to inhabit various substrata could all contribute to it maintaining a high biomass on the Agulhas Bank.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01133.x
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  • 4
    Electronic Resource
    Electronic Resource
    Introgression of quantitative trait loci (QTLs) determining stripe rust resistance in barley: an example of marker-assisted line development (1998)
    Springer
    Theoretical and applied genetics 96 (1998), S. 123-131 
    Details
    ISSN: 1432-2242
    Keywords: Key words QTL ; AFLP ; Marker-assisted selection ; Barley ; Puccinia striiformis f.sp. hordei
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Genome-analysis tools are useful for dissecting complex phenotypes and manipulating determinants of these phenotypes in breeding programs. Quantitative trait locus (QTL)-analysis tools were used to map QTLs conferring adult plant resistance to stripe rust (caused by Puccinia striiformis f.sp. hordei) in barley. The resistance QTLs were introgressed into a genetic background unrelated to the mapping population with one cycle of marker-assisted backcrossing. Doubled-haploid lines were derived from selected backcross lines, phenotyped for stripe-rust resistance, and genotyped with an array of molecular markers. The resistance QTLs that were introgressed were significant determinants of resistance in the new genetic background. Additional resistance QTLs were also detected. The susceptible parent contributed resistance alleles at two of these new QTLs. We hypothesize that favorable alleles were fixed at these new QTLs in the original mapping population. Genetic background may, therefore, have an important role in QTL-transfer experiments. A breeding system is described that integrates single-copy and multiplex markers with confirmation of the target phenotype in doubled-haploid lines phenotyped in field tests. This approach may be useful for simultaneously producing agronomically useful germplasm and contributing to an understanding of quantitatively inherited traits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050718
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