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  • Megasporocarp percentage  (2)
  • inertial confinement fusion  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Influence of gibberellic acid on the sporulation of Azolla caroliniana, Azolla microphylla and Azolla pinnata (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 424-429 
    Details
    ISSN: 1432-0789
    Keywords: Key words Azolla species ; Gibberellic acid ; Megasporocarp percentage ; Sporocarp number ; Sporulation frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Azolla microphylla strains used in the study sporulate throughout the year while Azolla caroliniana and Azolla pinnata strains show sporulation only during November–March, the favourable period for sporulation. Application of gibberellic acid (GA) at a concentration of 2.5–100.0 μg ml–1 substantially enhanced the sporulation frequency and number of sporocarps (mega plus micro) per plant in Azolla microphylla (two strains) during the unfavourable period (September–October) by 77.3–200.0%. The increase in the number of microsporocarps was more than that of the megasporocarps. The sporulation frequency and number of sporocarps in Azolla pinnata (two strains) and Azolla caroliniana during the favourable season also increased considerably due to GA (2.5–10.0 μg ml–1) application. The optimum GA concentration for the sporulation of the three Azolla species was 2.5 μg ml–1, which was used in the subsequent investigations. Efficacy of GA for enhancing sporulation was tested across 20 Azolla pinnata strains. A significant positive response was observed in all the strains. Of them, 17 strains for the sporulation frequency and 15 strains for the sporocarp number showed a 〉25% increase due to GA treatment. Under field conditions, Azolla microphylla (two strains), Azolla caroliniana and Azolla pinnata exhibited 66.0–88.1% higher sporulation frequency and 42.8–52.6% higher sporocarp number due to GA application. However, the proportion of megasporocarps to total sporocarps did not change.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050575
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  • 2
    Electronic Resource
    Electronic Resource
    Variability in Azolla sporulation in response to phosphorus application (2000)
    Springer
    Biology and fertility of soils 32 (2000), S. 458-462 
    Details
    ISSN: 1432-0789
    Keywords: KeywordsAzolla genotypes ; Megasporocarp percentage ; Phosphorus fertilization ; Sporocarp number ; Sporulation frequency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Phosphorus application decreased the sporulation frequency and number of sporocarps per plant in all the three Azolla species and 21 A. pinnata strains evaluated in this study. The number of megasporocarps tended to be more depressed than the number of microsporocarps. Nevertheless, the sporulation of A. caroliniana was less sensitive to P than that of A. pinnata and A. microphylla. Its sporulation frequency in the mineral medium did not decrease at 2.5 μg P ml–1 and remained unaffected between 5 and 20 μg P ml–1. The sporulation frequency and sporocarp number in this species in the soil culture also were not significantly affected by an increase in the dose of P from 10.7 to 21.4 or 21.4 to 32.1 mg pot–1. Large variations in the degree of inhibition of sporulation due to the application of P (21.4 mg pot–1) also occurred among the A. pinnata strains tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740000276
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of imploding shock waves with expanding central plasma in spherical pinch experiments: Simulation analysis (1990)
    Springer
    Journal of fusion energy 9 (1990), S. 513-516 
    Details
    ISSN: 1572-9591
    Keywords: Spherical pinch ; inertial confinement fusion ; shock wave compression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In the spherical pinch scheme, the hot D-T plasma produced in the center of the high pressure spherical vessel is confined by means of imploding shock waves launched from the periphery of the vessel for a time sufficiently long to achieve break-even conditions for plasma fusion. Theoretical studies on spherical pinch made so far have been limited up to the conditions of substantial expansion of the central plasma and the well-defined time delay between the creation of central plasma and the launching of the peripheral shock which led to the conclusion that, in realistic situations of SP experiments, negative time delays should be adopted, i.e., the launching of the imploding shock wave should precede the formation of the central plasma. However, the interaction of converging shock wave with the central plasma causing an additional heating and compression of the central plasma favoring plasma fusion conditions was not taken into account. Starting from the hydrodynamic equations of the system, the proposed simulation code deals with the propagation of converging shock waves and its interaction with the expanding central plasma. Considering the above-mentioned interaction in a self-consistent manner, the temporal evolution of temperature of central plasma is studied. Some results of the numerical simulation on the dynamics of shock wave propagation are also compared with the predictions of “point strong explosing theory.”
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01588289
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  • 4
    Electronic Resource
    Electronic Resource
    Scaling laws considering thermal radiation influence for spherical pinch experiments (1994)
    Springer
    Journal of fusion energy 13 (1994), S. 39-44 
    Details
    ISSN: 1572-9591
    Keywords: Spherical pinch ; inertial confinement fusion ; shock wave propagation ; radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In the spherical pinch scheme, the temperature of central D-T plasma must reach the value,T=2.58 kev and the density of central D-T plasma is also not very high. The radiation energy and pressure cannot be neglected. Taking into account the influence of the radiation, the present study reveals the new scaling laws under the conditions of high temperature radiation hydrodynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02214047
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