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  • 1
    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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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The response of rice to the growth and nitrogen fixation inAzolla caroliniana andAzolla pinnata at varying rates of phosphate fertilization (1989)
    Springer
    Plant and soil 114 (1989), S. 205-209 
    Details
    ISSN: 1573-5036
    Keywords: Azolla caroliniana ; Azolla pinnata ; nitrogen fixation ; Oryza sativa ; phosphate fertilizer ; rice yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The response of rice toAzolla caroliniana, newly introduced in India, was compared with the reponse to the local isolate ofAzolla pinnata at varying rates of phosphate fertilizer (4.4–8.8 kg P ha−1) during a wet and a dry season. Fresh weight, dry weight and fixed N were more for both species 21 DAI (days after inoculation) than 14 DAI, but acetylene reduction activity (ARA) was higher 14 DAI than 21 DAI. Dry weight of Azolla and fixed N were less 14 DAI forA. caroliniana than forA. pinnata during the wet season. Twenty-one DAI, fresh weight ofA. caroliniana was 62.1 and 27.6% higher than that ofA. pinnata during the wet and dry season, respectively. However, dry weight and fixed N were more 21 DAI inA. caroliniana than inA. pinnata during only the wet season. The ARA was higher inA. caroliniana both 14 and 21 DAI, irrespective of season. The presence of either species in the rice field increased grain yield, straw yield, number of panicles m−2, number of grains per panicle and reduced percentage sterility during both the wet and the dry season. Phosphate application significantly increased fresh weight, dry weight, ARA and fixed N for both species as well as grain and straw yields of rice. The responses to phosphate fertilizer were similar for both Azolla species and for rice grown with either one of the Azolla species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220799
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of varying periods of inoculation ofAzolla pinnata R. Brown on its growth, nitrogen fixation and response to rice crop (1987)
    Springer
    Plant and soil 98 (1987), S. 257-264 
    Details
    ISSN: 1573-5036
    Keywords: Azolla pinnata ; Inoculation ; Intercropping ; N2-fixation ; Rice yield ; Rice N-uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Inoculation of water fernAzolla pinnata R. Brown (Bangkok isolate) at the rate of 500kg fresh weight ha−1 in rice fields at weekly intervals after planting in addition to 30 kg N ha−1 as urea showed a decrease in its growth and N2-fixation with delay in application. Use of Azolla up to 3 weeks after planting (WAP) during wet and 4 WAP during dry season produced significantly more grain yield than 30 kg N ha−1, whereas its application upto one WAP produced more grain yield than 60 kg N ha−1. Grain yield with Azolla applied at the time of planting was similar to that of 60 kg N treatment during the wet season. Higher grain yields in zero and one WAP Azolla treatments resulted due to increase in both number of panicles m−2 and number of grains/panicle while the subsequent Azolla inoculations increased grain yield mainly by producing more number of grains/panicle. Dry matter and total N yields at maturity of rice crop were more with Azolla application upto 3 WAP during wet and 2 WAP during dry season while the reduction in sterility (%) was observed upto one WAP over 30 kg N ha−1 during both seasons. Number of tillers m−2 and dry matter production at maximum tillering and flowering were more than 30 kg N ha−1 with the use of Azolla upto one WAP. Increased grain N yield was observed with the use of Azolla upto 4 WAP during two seasons whereas straw N yield increased upto one WAP during wet and 2 WAP during dry season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374829
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    Paper (German National Licenses)
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