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Träfflista för sökning "WFRF:(Svensson Olof) ;srt2:(2010-2014)"

Sökning: WFRF:(Svensson Olof) > (2010-2014)

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41.
  • Lambeck, Kurt, et al. (författare)
  • The Scandinavian ice sheet :  from MIS 4 to the end of the Last Glacial Maximum
  • 2010
  • Ingår i: Boreas. - 0300-9483. ; 39:2, s. 410-435
  • Tidskriftsartikel (refereegranskat)abstract
    • Glacial rebound modelling, to establish constraints on past ice sheets from the observational evidence of palaeo shoreline elevations, is well established for the post-LGM period where the observational evidence is relatively abundant and well distributed spatially and in time. This is particularly the case for Scandinavia. For the earlier part of the glacial cycle this evidence becomes increasingly sparse and uncertain such that, with the exception of the Eemian period, there are very few, if any, direct sea level indicators that constrain any part of the Scandinavian ice sheet evolution before the Last Glacial Maximum (LGM). Instead we assume that ice-sheet basal conditions during Marine Isotope Stage 3 (MIS 3) are the same as those for the LGM, focus on establishing these conditions from the rebound analysis for the LGM and Lateglacial period, and then extrapolate to the earlier period using observationally constrained locations of the ice margins. The glacial rebound modelling and inversion follows previously established formulation with the exception that the effects of water loading from proglacial lakes that form within the Baltic Basin and elsewhere have been included. The data set for the inversion of the sea- and lake-level data has been extended to include marine limit data to extend the observational record further back in time. The result is a sequence of time slices for the Scandinavian ice sheet from the time of MIS 4 to the Lateglacial that are characterised by frozen basal conditions until late in the LGM interval when rapid thinning occurred in the eastern and southern sectors of the ice sheet. The primary function of these models is as an interpolator between the fragmentary observational constraints and to produce quantitative models for the glaciation history with predictive capabilities, such as the evolution of the Baltic Basin.
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42.
  • Lambeck, Kurt, et al. (författare)
  • The Scandinavian Ice Sheet: from MIS 4 to the end of the Last Glacial Maximum
  • 2010
  • Ingår i: Boreas. - John Wiley and Sons Ltd. - 1502-3885. ; 39:2, s. 410-435
  • Forskningsöversikt (refereegranskat)abstract
    • Glacial rebound modelling, to establish constraints on past ice sheets from the observational evidence of palaeo-shoreline elevations, is well established for the post- Last Glacial Maximum (post-LGM) period, for which the observational evidence is relatively abundant and well distributed spatially and in time. This is particularly the case for Scandinavia. For the earlier part of the glacial cycle this evidence becomes increasingly sparse and uncertain such that, with the exception of the Eemian period, there are very few, if any, direct sea-level indicators that constrain any part of the Scandinavian Ice Sheet evolution before the LGM. Instead, we assume that ice-sheet basal conditions during Marine Isotope Stage 3 (MIS 3) are the same as those for the LGM, focus on establishing these conditions from the rebound analysis for the LGM and Lateglacial period, and then extrapolate to the earlier period using observationally constrained locations of the ice margins. The glacial rebound modelling and inversion follow previously established formulations, with the exception that the effects of water loading from proglacial lakes that form within the Baltic Basin and elsewhere have been included. The data set for the inversion of the sea- and lake-level data has been extended to include marine-limit data in order to extend the observational record further back in time. The result is a sequence of time slices for the Scandinavian Ice Sheet from the time of MIS 4 to the Lateglacial that are characterized by frozen basal conditions until late in the LGM interval when rapid thinning occurred in the eastern and southern sectors of the ice sheet. The primary function of these models is as an interpolator between the fragmentary observational constraints and to produce quantitative models for the glaciation history with predictive capabilities, for example regarding the evolution of the Baltic Basin.
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43.
  • Larsson, Anders Olof, et al. (författare)
  • Politicians online : Identifying current research opportunities
  • 2014
  • Ingår i: First Monday. - 1396-0466 .- 1396-0466. ; 19:4
  • Tidskriftsartikel (refereegranskat)abstract
    • For more than a decade, researchers have shown interest in how politicians make use of the Internet for a variety of purposes. Based on critical assessments of previous online political communication scholarship, this paper identifies a series of overlooked areas of research that should be of interest for researchers concerned with how politicians make use of online technologies. Specifically, three such research opportunities are introduced. First, we suggest that research should attempt to move beyond dichotomization, such as conceiving of the Internet as either bringing about revolutionary changes or having a normalizing effect. Second, while there is a considerable body of knowledge regarding the activity of politicians during election campaigns, relatively little is known about the day–to–day communicative uses of the Internet at the hands of politicians. The third section argues that as political communication research has typically focused on national or international levels of study, scholars within the field should also make efforts to contribute to our knowledge of online practices at the hands of politicians at regional and local levels — something we label as studies at the micro level. In synthesizing the literature available regarding the use of the Internet at the hands of politicians, the paper concludes suggesting routes ahead for interested scholars.
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46.
  • Leisse, Ingmar, et al. (författare)
  • Coordinated voltage control in medium and low voltage distribution networks with wind power and photovoltaics
  • 2013
  • Ingår i: IEEE PowerTech 2013,Grenoble, France,2013-06-16 - 2013-06-20.
  • Konferensbidrag (refereegranskat)abstract
    • Distributed Generation (DG) installations have been increasing during the last years. Wind power and photovoltaics are two of the most common renewable energy sources for DG typically connected to the distribution network (DN) originally planned and built to supply loads. DG units connected to the DN impact the voltage where customers are connected. Network voltage is an important quality criterion in DN. Voltage rise caused by DG units may become one of the limiting factors for the hosting capacity of wind power and photovoltaics in DNs. Increasing the hosting capacity by network rebuilding is possible but it is expensive and time consuming. Coordinated voltage control has been proposed to increase network capacity without the need of reinforcement. Simulations based on an existing medium and low voltage DN with wind power and photovoltaics are presented. It is shown that coordinated voltage control can increase the hosting capacity and avoid network reinforcement.
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47.
  • Leisse, Ingmar, et al. (författare)
  • Electricity Meters for Coordinated Voltage Control in Medium Voltage Networks with Wind Power
  • 2010
  • Ingår i: Innovative Smart Grid Technologies Conference Europe (ISGT Europe), 2010 IEEE PES,Gothenburg, Sweden,2010-10-11 - 2010-10-13.
  • Konferensbidrag (refereegranskat)abstract
    • During the last years the amount of electricity generated by Distributed Energy Resources (DER), especially wind turbines, has been increasing a lot. These Distributed Generation (DG) units are often connected to rural distribution networks, where they have a large impact on the voltage and the network losses. The network voltage at the customers point of connection is an important quality criteria and has to follow different standards as e.g. EN 50160. Therefore the voltage change caused by the integration of production units in the distribution network is an important aspect when integrating more DG in distribution networks and often a limiting factor for the maximum DG capacity which is possible to integrate into an existing network without reinforcement. Using the available voltage band more efficient by applying coordinated voltage control is a possibility to increase the hosted DG capacity in an existing distribution network without reinforcement of the network. To get the actual network status the new generation of electricity meters, which have the feasibility to communicate real time voltage measurements from the customers side to a network controller, give some benefits to a more flexible and coordinated voltage control in the network. The voltage range in the network will be used adapted to the actual load and generation situation instead of using worst case assumptions as it is good practice until now. A main part of the voltage control in medium voltage distribution networks is done by the on-load tap changer (OLTC) which takes the voltage at the consumers point of connection into account. A generic 10 kV distribution network with three typical types of feeders, as pure load, pure generation and mixed load and generation feeder, has been outlined. Coordinated voltage control is implemented by a central voltage controller. Simulations on the voltage and the network losses have been done and will be presented in this paper. The maximum DG capacity in the test system increases most when introducing coordinated control of the OLTC but also the use of reactive power adds some benefit. Further increase of the DG capacity by more extensive use of curtailment is always possible but due to economical aspects not favoured.
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48.
  • Leisse, Ingmar, et al. (författare)
  • Increasing DG Capacity of Existing Networks through Reactive Power Control and Curtailment
  • 2010
  • Ingår i: The 9th Nordic Electricity Distribution and Asset Management Conference (NORDAC 2010),Aalborg, Denmark,2010-09-06.
  • Konferensbidrag (refereegranskat)abstract
    • Renewable energy sources (RES), especially wind turbines, have become more important during the last years. An increasing number of distributed generation (DG) units are connected to weak medium voltage distribution networks in rural areas where they have a large influence on the voltage and the line losses. Voltage rise is in this case often a limiting factor for the maximum amount of DG capacity. Already current wind turbines with a capacity of 2 MW can often not easily be connected to existing 10 kV feeders. To increase the DG capacity of existing networks without reinforcement DG units can be controlled. This paper proposes abandoning unity power factor used today and letting the converters used as network interface of many new wind turbine generators absorb reactive power to reduce the voltage level. Since reactive power has great influence on losses in the network the use of reactive power is limited. Line losses due to the transfer of reactive power are taken into account in this study. Furthermore the use of curtailment is analysed. Simulations of voltage change and line losses when using reactive power control by the connected wind turbines and curtailment in a simple test system are presented. Without reinforcement of the network it was possible to increase the DG capacity from 2;7MW to more than 4MW in the test network without violating voltage limits. Line losses increase but to a reasonable extent and lost energy due to curtailment is insignificant.
49.
  • Liberg, Olof, et al. (författare)
  • Monitoring of wolves in Scandinavia
  • 2012
  • Ingår i: Hystrix, the Italian Journal of Mammalogy. - Associazione Teriologica Italiana. - 0394-1914 .- 1825-5272. ; 23, s. 29-34
  • Tidskriftsartikel (refereegranskat)abstract
    • The Scandinavian wolf population is jointly monitored by Norwegian and Swedish authorities. Monitoring is made annually. Wolves are classified in different categories. Family groups (>= 3 animals sharing a territory), territorial pairs, other stationary wolves, and vagrants. Also number of reproductions are determined each year, and has the highest priority as national management goals for the wolf population in both countries are expressed as number of reproducing units. Three methods are used in combination. Tracking on snow is the basic method. Around 100 field workers are employed full time or part time to find and follow tracks of wolves during the monitoring season Oct. 1 - Feb 28. The second method is DNA-analysis, mainly based on wolf scats collected during tracking. DNA-analysis help verifying reproductions, identifying newly established pairs, differentiating between neighboring territories and for identifying new immigrants from the Finnish/Russian population. The third method is radio telemetry. 10-20 wolves are equipped with GPS-collars each year, and used for determining of territory extents and differentiating between neighboring territories. All monitoring data are recorded in national databases, and compiled each year in an annual monitoring reports. Annual budget for large carnivore monitoring in the two countries combined in 2011 was approximately 5.8 million Euro, of which approximately 1.5 million was spent on wolves.
50.
  • Lindh, Liselott, et al. (författare)
  • AFM-based friction force spectroscopy : a novel methodology for the study of the strength and lateral diffusion of proteinaceous films
  • 2012
  • Ingår i: Proteins at Interfaces III State of the Art. - American Chemical Society. - 9780841227972
  • Bokkapitel (övrigt vetenskapligt)abstract
    • We present a novel methodology for the study of proteinaceous films based on the friction force spectroscopy operation mode of the atomic force microscope. It provides information both on the strength at the nanoscale level and on the lateral diffusion properties of these systems. The usefulness of the data generated by this methodology are shown through its application to the study of different types of monolayers of model proteins, as well as to the study of the more complex and heterogeneous salivary films.
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