1,721,049 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Future demand for ecosystem services from terrestrial ecosystems from global power production scenarios to 2100:the role of forest biomass
Full text linkCarbon and nitrogen in forest soils. Interpretations related to the state factor model for soil development:Gæsteforedrag, Sveriges Lantbruksuniversitet, Institutionen för Skogsekologi
No full textUdgivelsesdato: 24. augus
Signals from beech (Fagus sylvatica L.) in response to precipitation extremes - flowering induction and reduced foliation
Full text linkReduced foliation in older (but also young) beech (Fagus sylvatica L.) stands was observed in Denmark in the mid 1990ies and culminated with the 1996 summer drought and heat wave. Large differences in the degree of reduced foliation between regions and within stands were observed e.g. reflecting stand structure and exposure. An analysis of monthly precipitation and temperature data from 1873-1996 in south-eastern Denmark revealed that the series of summers with low precipitation in 1994-1996 was rare but not unprecedented. The precipitation data were compared with a data series of mast years (classes ranging from 1~no mast to 4~maximum mast production) showing that widespread flowering in beech occurred when the summer in the previous year had been warm and dry, and when a favorable growing season occurred two years prior to the mast year in terms of higher than average precipitation and lower than average temperature during june, july and august. The different response could also be related to site factors that prevented deep and permanent rooting due to occasional lack of soil aeration. The permanent rooting depth should be devoid of signs of stagnant water (gley and severe pseudogley) caused by poor internal drainage and minor depressions in micro relief
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Soil C and N and driving variables for soil development:Gæsteforedrag, BayCEER
No full textUdgivelsesdato: 18. Februa
Global power production scenarios to 2100 and the dual role of forests: accelerated climate damage or regulating and provisioning ecosystem services?:Oral presentation
Full text linkThe worlds' electrical power production is depending on the current energy infrastructure, and future investments in new power supply facilities using renewable and non-renewable energy sources. Continued growth in power production in the 21st century will cause global environmental change (GEC). GEC with climate change as an important driver will affect the environment and the economy in multiple ways that can be summarized as losses of biodiversity and changing ecosystem services (ES), but with very diverse temporal and spatial impacts. In a simple global growth model for power production, including non-renewable and renewable energy sources, the potential role of forest biomass is investigated. The demands for forest ecosystem services imposed by the global power production are assessed in the present study. Three global power supply scenarios to 2050 with different emphasis on bioelectricity from forest biomass and the associated environmental impacts are outlined using LCA unit process data. The power production is used as a simplified proxy for the global energy supply. It is assumed that the most suitable land under each scenario is reserved for food production, and that changes in human diets can satisfy the food demand in this way. It is further assumed that the transport system is electrified and that mobility is satisfied by the electricity produced. The scenarios outline the combined pressures from increasing atmospheric GHG concentrations, nitrogen enrichment, acidification, and land use changes on global forest areas. These pressures will increase the need for versatile forest management systems. The management options for provisioning ecosystem services (e.g. bioelectricity as a combined mitigation and adaptation strategy) and regulating ecosystem services delivered by forests are discussed under each change scenario.The worlds' electrical power production is depending on the current energy infrastructure, and future investments in new power supply facilities using renewable and non-renewable energy sources. Continued growth in power production in the 21st century will cause global environmental change (GEC). GEC with climate change as an important driver will affect the environment and the economy in multiple ways that can be summarized as losses of biodiversity and changing ecosystem services (ES), but with very diverse temporal and spatial impacts. In a simple global growth model for power production, including non-renewable and renewable energy sources, the potential role of forest biomass is investigated. The demands for forest ecosystem services imposed by the global power production are assessed in the present study. Three global power supply scenarios to 2050 with different emphasis on bioelectricity from forest biomass and the associated environmental impacts are outlined using LCA unit process data. The power production is used as a simplified proxy for the global energy supply. It is assumed that the most suitable land under each scenario is reserved for food production, and that changes in human diets can satisfy the food demand in this way. It is further assumed that the transport system is electrified and that mobility is satisfied by the electricity produced. The scenarios outline the combined pressures from increasing atmospheric GHG concentrations, nitrogen enrichment, acidification, and land use changes on global forest areas. These pressures will increase the need for versatile forest management systems. The management options for provisioning ecosystem services (e.g. bioelectricity as a combined mitigation and adaptation strategy) and regulating ecosystem services delivered by forests are discussed under each change scenario
Transfer functions for carbon sequestration, nitrogen retention and nutrient release capability in forest soils based on soil texture classifications
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