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  • Articles  (12)
  • Resource management
  • adaptation
  • fusion-fission hybrids
  • 1980-1984  (12)
  • 1950-1954
  • 1940-1944
  • 1983  (4)
  • 1982  (8)
  • Energy, Environment Protection, Nuclear Power Engineering  (10)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (2)
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  • Articles  (12)
Keywords
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  • 1980-1984  (12)
  • 1950-1954
  • 1940-1944
Year
Topic
  • 1
    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.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 6 (1982), S. 123-144 
    ISSN: 1432-1009
    Keywords: Simulation ; Resource management ; Fishing communities ; Rural development ; Interdisciplinary models ; Socio-ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The interrelationship of society and environment is addressed here through the study of a remote fishing village of 750 people. An interdisciplinary study evaluated demographic, economic, and social aspects of the community, and simulation modeling was used to integrate these societal characteristics with environmental factors. The population of the village had grown gradually until the 1960's, when a decline began. Out-migration correlated with declining fish harvests and with increased communications with urban centers. Fishing had provided the greatest economic opportunity, followed by logging. A survey was conducted to investigate the costs and revenues of village fishermen. Diversification characterized the local fleet, and analysis showed that rates of return on investment in the current year were equal between vessel types. The variable levels and rate parameters of the demographic, economic, and social components of the model were specified through static and time series data. Sensitivity analysis to assess the effects of uncertainty, and validation tests against known historical changes were also conducted. Forecast scenarios identified the development options under several levels of fish abundance and investment. The weight given to ecological versus economic resource management registered disproportionate effects due to the interaction between investment and migration rates and resource stochasticity. This finding argues against a “golden mean” rule for evaluating policy trade-offs and argues for the importance of using a dynamic, socio-ecological perspective in designing development policies for rural communities.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 6 (1982), S. 527-533 
    ISSN: 1432-1009
    Keywords: Regional institutions ; Resource management ; Participation ; Political ; Rational ; Decison rule ; Consensus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Evaluators frequently cite the absence of effective participation by constituent governments and the need for consensus or even unanimity prior to action as the causes of poor performance by regional resource management institutions. Major governments either will not join the regional institution, will not participate even if legally members, or will exercise a veto over many important management projects. This paper examines the variables that may cause these problems and provides an improved understanding of why rational political actors would act in ways that inhibit the efficient management of resources. Among the principal variables determining participation are expected benefits of collective decisions, perceived losses of autonomy and representation, the number and homogeneity of other participants, decision costs, and the decision rule used to determine actions. Analysis of these factors suggests why consensus and unanimity decision rules are frequently chosen and why participation is usually limited.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 7 (1983), S. 299-302 
    ISSN: 1432-1009
    Keywords: Wetlands ecosystems ; Human environmental impact ; Resource management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Two recent studies have documented changes in wetland ecosystems in New England by examining changes in wetland vegetation over time. Both documented shifts in vegetation towards shrub and forest dominated wetlands Both then concluded that natural succession has changed more wetlands than human impact has. The last conclusion does not necessarily follow from the data provided. There are three important points that emerge from re-considering these studies 1) indirect human impact (for example, water level changes, eutrophication, sedimentation) must be considered when assessing human impact on wetlands, particularly given that subtle indirect impact affects larger areas than direct impact from drainage and infilling, 2) when discussing indirect effects of human activity, it is important to carefully define which indirect effects are being considered, since there is a continuum ranging from infilling through to alteration of global CO2 levels, and 3) given the complexity of indirect effects, it is unlikely that most can be recognized in the field.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Environmental management 7 (1983), S. 401-420 
    ISSN: 1432-1009
    Keywords: Suitability analysis ; Land-use assessment ; Resource management ; Planning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract There is a growing need to develop methods for analyzing resource suitability that are both legally defensible and accurate. Three approaches to suitability analysis are reviewed: the US Soil Conservation Service capability classification and important farmlands mapping; the McHarg, or Pennsylvania, suitability analysis method; and Dutch approaches to suitability analysis. Computer applications and the carrying-capacity concept are briefly reviewed. Three applications of suitability analysis are discussed: examples from Medford Township, New Jersey; Whitman County, Washington; and Abuja, the new federal capital city of Nigeria.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Euphytica 31 (1982), S. 485-492 
    ISSN: 1573-5060
    Keywords: Chrysanthemum morifolium ; light ; temperature ; selection ; genotype environment interaction ; adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Chysanthemum cultivars were grown in 4 experiments in the greenhouse and in the phytotron. The growing conditions in the greenhouse varied from 14 C, 60 J cm2 day-1 to 17 C. 431 J cm2 day-1, those in the phytotron from 12 to 455 J cm-2 day-1 at a temperature of either 14 or 20 C. Most cultivars responded differentially to light and/or temperature, but this was only measurable when large differences in light and/or temperature were imposed. Reducing the light level in a greenhouse by 50% does not bring out cultivar×light interactions. Such interactions may be pronounced however when the performance in summer is compared with that in winter. This is also reflected in the correlation coefficients. The correlations between summer and winter performance for number of flowers per stem and the number of days to flowering are non-significant, those for the 7 other traits measured were all significant. The occurrence of interactions does not preclude the possibility of breeding cultivars adapted to a wide range of light and temperature conditions. Appropriate selection procedures are discussed.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1573-5060
    Keywords: Lolium multiflorum ; Italian ryegrass ; adaptation ; pattern analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Clustering procedures for the recognition of patterns of adaptation were applied to 43 introduced populations of Lolium multiflorum undergoing evaluation prior to use in breeding programmes. Regular analysis of variance of the productivity revealed considerable interaction between populations and the 15 cuts imposed. The clustering reduced this to a 12 group situation, which maintained 85% of the population variation and 81% of population × cut interaction. The twelve groups displayed differing patterns of adaptation which could be related to the ecological situations from where the populations derived.
    Type of Medium: Electronic Resource
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  • 8
    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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  • 9
    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.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 10 (1982), S. 289-323 
    ISSN: 1572-9915
    Keywords: coevolution ; adaptation ; cultural evolution ; genetic evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract This paper proposes models and examples of five principal modes of interaction between genes and culture in human evolution. Because genes and culture ultimately interact in the minds of individuals, the models are focused on individual level processes of “constrained microevolution.” The central hypotheses are (1) that cultural evolution as well as genetic evolution commonly proceeds by the differential transmission of alternative “instructions” among individuals, (2) that genetic and cultural processes directly interact through mutual influence on each other's differentials of transmission in a population, (3) that the cultural process is often self-selecting by its own criteria, and (4) that these criteria generally operate to enhance rather than oppose human adaptation. Evolutionary change at higher levels, which is particularly important in sociocultural evolution, is interpreted as restructuring the nature and extent of the variability available at the individual level. To clarify the conceptual differences of the models and hopefully to stimulate related analyses in other areas, I discuss selected examples of each of these interactions. I conclude with some remarks on the relative importance of the models to human ecology and evolution.
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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 10 (1982), S. 455-476 
    ISSN: 1572-9915
    Keywords: fishing ; faunal analysis ; Oceania (Hawaii) ; niche width ; adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract Archaeological evidence for prehistoric strategies of marine exploitation in Oceania may be profitably analyzed from an ecological perspective, in which individual sites and assemblages are viewed in the context of adaptation to local environmental constraints. This perspective is illustrated through the contrastive analysis of environment, technology, and faunal remains at three prehistoric Hawaiian sites. Differing strategies of marine exploitation evidenced for each site are shown to reflect local marine environmental conditions. An ecological approach shows greater promise for an understanding of prehistoric adaptation to marine environment than the typological analyses current in much archaeological work on fishing.
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Human ecology 11 (1983), S. 13-34 
    ISSN: 1572-9915
    Keywords: Swidden cultivation ; Ye'kwana ; Yanomamö ; neotropics ; adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Ethnic Sciences
    Notes: Abstract A number of researchers have suggested that polyculture is characteristic of native tropical forest swiddens and have adduced theory from community ecology to account for its adaptiveness. Ye'kwana and Yanomamö swidden cultivation is examined, and it is shown that polyculture is not practiced to any significant degree. Instead, the concept of polyvariety is introduced along with a number of other cultivation practices that more simply account for the adaptiveness of Ye'kwana and Yanomamö gardening. In addition, comparative data from other parts of the tropical world indicate that polyculture is no more common than monoculture and recent advances in ecological research indicate that the diversity-stability hypothesis that underpins adaptive arguments of polyculture is in need of drastic revision.
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