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  • Articles  (12)
  • fusion-fission hybrids  (6)
  • pastoralism  (6)
  • Springer  (12)
  • 2010-2014
  • 1980-1984  (12)
  • 1950-1954
  • Energy, Environment Protection, Nuclear Power Engineering  (12)
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  • Articles  (12)
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  • Springer  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 1 (1981), S. 197-210 
    ISSN: 1572-9591
    Keywords: fusion-fission hybrids ; fusion reactor safety ; weapons proliferation ; radioactive wastes ; activation products ; fission product transmutation ; uranium-233
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The rationale for developing hybrids depends on real or perceived liabilities of relying on pure fission to do the same job. Quite possibly the main constraint on expanded use of fission will be neither lack of fuel nor high costs, but perceived environmental liabilities—radioactive wastes, reactor safety, and links to nuclear weaponry. The environmental characteristics of hybrid systems and pure-fission systems are compared here in detail. The findings are that significant environmental advantages for hybrids cannot now be demonstrated and may not exist. Therefore, if environmental drawbacks constrain the application of pure fission, hybrids probably also will be thus constrained.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 3 (1983), S. 81-93 
    ISSN: 1572-9591
    Keywords: cost/benefit ; fusion-fission hybrids ; present worth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A simple algorithm was developed that allows rapid computation of the ratio,R, of present worth of benefits to present worth of hybrid R&D program costs as a function of potential hybrid unit electricity cost savings, discount rate, electricity demand growth rate, total hybrid R&D program cost, and time to complete a demonstration reactor. In the sensitivity study, these variables were assigned nominal values (unit electricity cost savings of 4 mills/kW-hr, discount rate of 4%/year, growth rate of 2.25%/year, total R&D program cost of $20 billion, and time to complete a demonstration reactor of 30 years), and the variable of interest was varied about its nominal value. Results show thatR increases with decreasing discount rate and increasing unit electricity savings and ranges from 4 to 94 as discount rate ranges from 5 to 3%/year and unit electricity savings range from 2 to 6 mills/kW-hr.R increases with increasing growth rate and ranges from 3 to 187 as growth rate ranges from 1 to 3.5%/year and unit electricity cost savings range from 2 to 6 mills/kW-hr.R attains a maximum value when plotted against time to complete a demonstration reactor. The location of this maximum value occurs at shorter completion times as discount rate increases, and this optimal completion time ranges from 20 years for a discount rate of 4%/year to 45 years for a discount rate of 3%/year.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 1 (1981), S. 163-183 
    ISSN: 1572-9591
    Keywords: fusion ; fusion-fission hybrids ; hybrids ; gas-cooling ; helium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In this paper, the concept of the fusion-fission hybrid reactor is reviewed, and a system of classification for hybrid blanket designs is suggested. The advantages and disadvantages of gas cooling for hybrid reactor systems are discussed and the design implications of using gas cooling in a hybrid blanket are presented. Five of the more complete gas-cooled hybrid reactor conceptual design studies are discussed, and the fission-suppressed hybrid blanket concept is identified as offering potentially significant advantages in terms of inherent safety features and reduced technology development requirements compared to higher power fission blankets. It is concluded that helium is attractive as the coolant for hybrid reactor systems, and that technically viable reactor designs have been developed using helium cooling. The helium-cooled fission-suppressed hybrid blanket, based on thorium fuel for production of233U, is identified as being a particularly attractive candidate for further hybrid reactor development work.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 2 (1982), S. 369-373 
    ISSN: 1572-9591
    Keywords: Fusion ; fusion-fission hybrids ; advanced nuclear systems ; uranium supply
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A summary is given of recently completed and planned fusion-fission hybrid projects. Electricity supply/demand projections and estimates of future uranium requirements for several different combinations of nuclear systems, including hybrids, are discussed.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 2 (1982), S. 181-196 
    ISSN: 1572-9591
    Keywords: fusion-fission hybrids ; deuterium fueled fusion reactors ; D-D reactions ; D-3He fusion reactions ; thermonuclear fusion ; parent-satellite nuclear energy systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Selected reactor physics and isotope balance characteristics of a fusion hybrid supported D-3He satellite nuclear energy system are formulated and investigated. The system consists of two types of reactors: a parent D-fueled fusion device and a number of smaller reactors optimized for D-3He fusion. The parent hybrid station breeds the helium-3 for the satellites and also breeds fissile fuel for an existing fission reactor economy. Various hybrid operational regimes are examined in order to determine favorable reactorQ values and effective fusion and fission efficiencies. A number of analytical correlations between power output, plasma energetics, blanket neutronics, breeding capacity, and energy conversion cycles are established and evaluated. Numerical examples of performance parameters such as fission-to-fusion power, overall conversion efficiency, and the ratio of satellite to parent fusion power are presented. The range of reactor efficiencies is elucidated as affected by the internal plasma power balances. As an upper bound based on optimistic injection and direct conversion efficiencies, we find the D-3He satellite system power output attaining at best 1/3 of the parent fusion power.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of fusion energy 1 (1981), S. 185-196 
    ISSN: 1572-9591
    Keywords: nuclear fusion ; fissile fuel production ; nuclear fuel production ; fusion-fission hybrids ; future nuclear fuel resources
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The use of nuclear fusion to produce fuel for nuclear fission power stations is discussed in the context of a crucial need for future energy options. The fusion hybrid is first considered as an element in the future of nuclear fission power to provide long term assurance of adequate fuel supplies for both breeder and convertor reactors. Generic differences in neutronic characteristics lead to a fuel production potential of fusion-fission hybrid systems which is significantly greater than that obtainable with fission systems alone. Furthermore, cost benefit studies show a variety of scenarios in which the hybrid offers sufficient potential to justify development costs ranging in the tens of billions of dollars. The hybrid is then considered as an element in the ultimate development of fusion electric power. The hybrid offers a near term application of fusion where experience with the requisite technologies can be derived as a vital step in mapping a credible route to eventual commercial feasibility of “pure” fusion systems. Finally, the criteria for assessment of future energy options are discussed with prime emphasis on the need for rational comparison of alternatives. This approach is contrasted with the dual standard too often used in judging the risks and benefits of nuclear power where, for example, rather minor radiological effects are highlighted while much larger exposures to radiation from medical x-rays, airplane travel, color television sets, etc., are ignored. It is concluded that the fusion hybrid deserves a prominent place among new energy resources but that early attention to insure an adequately informed public is a vital ingredient in assuring reasonable prospects of success.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 10 (1982), S. 85-106 
    ISSN: 1572-9915
    Keywords: Middle East ; pastoralism ; economic anthropology ; economic mobility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract Accounts of Southwest Asian pastoralism often suggest that wealth in animals is volatile. However, no systematic study has been undertaken to determine either the potential for herd increase and loss or the likely long-term implications of this potential. Drawing on an analysis of data from the Komachi nomads of south-central Iran and other Southwest Asian pastoralists, this paper addresses these questions. It argues that, contrary to conventional expectations, (a) herds in the region do not show potential for dramatic increase; (b) radical shifts in individual economic status are unlikely to occur through normal gains and losses; and (c) to the extent that short-term gains or losses of individual holdings do occur, long-term economic differentiation within a population can be expected.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 10 (1982), S. 107-143 
    ISSN: 1572-9915
    Keywords: pastoralism ; ecology and development ; malarial history ; shifting cultivation ; ecological history
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract The Gavlis are a pastoral caste of the forested hill tracts of India 's Western Ghats region. This paper examines their shift under British colonial rule from buffalo-keepers to goatherds to cultivators of increasingly marginal hill tracts, the context of forest exploitation and malaria control as well as more recent dairy development programs of the Indian government. It concludes that if present trends continue Gavlis everywhere will follow the same progression, eventually becoming landless migrants.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 12 (1984), S. 35-64 
    ISSN: 1572-9915
    Keywords: Kenya ; drought ; farming ; pastoralism ; rural development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract From 1972 to 1976 rainfall in Kajiado District of Kenya was below normal. The capacity of the farming and herding systems to cope with the consequent reduction in production is discussed within a context of changing land-use patterns and altered resource availability. It is concluded that land-use planning to allocate the available land and water resources and to promote off-farm employment is required to reduce the vulnerability of the population to future drought conditions.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 12 (1984), S. 431-441 
    ISSN: 1572-9915
    Keywords: pastoralism ; overstocking ; overgrazing ; environmental degradation ; wildlife conservation ; joint land use ; Ngorongoro Conservation Area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract Traditional subsistence pastoralists are often seen as causing environmental degradation through overgrazing, and are also seen as responsible for a decline in wildlife numbers through resource competition and habitat change. This paper investigates recent ideas on the interaction of pastoralism and conservation that question the validity of the concepts of overstocking and overgrazing as applied to arid and semiarid rangelands. The Ngorongoro Conservation Area, a Maasai pastoralist/wildlife conservation joint land use area in northern Tanzania, shows no clear signs of pastoralist-induced environmental degradation despite a preoccupation with this possibility by successive administrations. Ecological studies together with other considerations suggest that joint land use works to the long-term benefit of both pastoralism and conservation in this and other areas.
    Type of Medium: Electronic Resource
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 8 (1980), S. 117-134 
    ISSN: 1572-9915
    Keywords: mountain ecosystems ; latitudinality ; mixed mountain agriculture ; Himalayas ; Tibetans ; pastoralism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract This paper argues that the altitude-oriented “mixed mountain agriculture” model in which mountain dwellers move to higher altitudes in summer and lower ones in winter does not fit the empirical situation in many areas of the Himalayas where north-south or latitudinally differentiated habitat and production zones play important and, in some instances, central roles.
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 11 (1983), S. 175-199 
    ISSN: 1572-9915
    Keywords: decision-making ; organization theory ; pastoralism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract It is suggested on both theoretical and empirical grounds that both central tendency and maximum potential range of variation in camp size among a variety of pastoral nomad groups is heavily constrained by limitations on the ability of individuals and small groups to monitor and process information in decision-making contexts.
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