SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Wenninger Thomas) "

Sökning: WFRF:(Wenninger Thomas)

  • Resultat 1-18 av 18
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Abel, I, et al. (författare)
  • Overview of the JET results with the ITER-like wall
  • 2013
  • Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 53:10, s. 104002-
  • Tidskriftsartikel (refereegranskat)abstract
    • Following the completion in May 2011 of the shutdown for the installation of the beryllium wall and the tungsten divertor, the first set of JET campaigns have addressed the investigation of the retention properties and the development of operational scenarios with the new plasma-facing materials. The large reduction in the carbon content (more than a factor ten) led to a much lower Z(eff) (1.2-1.4) during L- and H-mode plasmas, and radiation during the burn-through phase of the plasma initiation with the consequence that breakdown failures are almost absent. Gas balance experiments have shown that the fuel retention rate with the new wall is substantially reduced with respect to the C wall. The re-establishment of the baseline H-mode and hybrid scenarios compatible with the new wall has required an optimization of the control of metallic impurity sources and heat loads. Stable type-I ELMy H-mode regimes with H-98,H-y2 close to 1 and beta(N) similar to 1.6 have been achieved using gas injection. ELM frequency is a key factor for the control of the metallic impurity accumulation. Pedestal temperatures tend to be lower with the new wall, leading to reduced confinement, but nitrogen seeding restores high pedestal temperatures and confinement. Compared with the carbon wall, major disruptions with the new wall show a lower radiated power and a slower current quench. The higher heat loads on Be wall plasma-facing components due to lower radiation made the routine use of massive gas injection for disruption mitigation essential.
  •  
2.
  • Overview of the JET results
  • 2015
  • Ingår i: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 55:10
  • Tidskriftsartikel (refereegranskat)
  •  
3.
  • Romanelli, F, et al. (författare)
  • Overview of the JET results
  • 2011
  • Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 51:9
  • Tidskriftsartikel (refereegranskat)abstract
    • Since the last IAEA Conference JET has been in operation for one year with a programmatic focus on the qualification of ITER operating scenarios, the consolidation of ITER design choices and preparation for plasma operation with the ITER-like wall presently being installed in JET. Good progress has been achieved, including stationary ELMy H-mode operation at 4.5 MA. The high confinement hybrid scenario has been extended to high triangularity, lower ρ*and to pulse lengths comparable to the resistive time. The steady-state scenario has also been extended to lower ρ*and ν*and optimized to simultaneously achieve, under stationary conditions, ITER-like values of all other relevant normalized parameters. A dedicated helium campaign has allowed key aspects of plasma control and H-mode operation for the ITER non-activated phase to be evaluated. Effective sawtooth control by fast ions has been demonstrated with3He minority ICRH, a scenario with negligible minority current drive. Edge localized mode (ELM) control studies using external n = 1 and n = 2 perturbation fields have found a resonance effect in ELM frequency for specific q95values. Complete ELM suppression has, however, not been observed, even with an edge Chirikov parameter larger than 1. Pellet ELM pacing has been demonstrated and the minimum pellet size needed to trigger an ELM has been estimated. For both natural and mitigated ELMs a broadening of the divertor ELM-wetted area with increasing ELM size has been found. In disruption studies with massive gas injection up to 50% of the thermal energy could be radiated before, and 20% during, the thermal quench. Halo currents could be reduced by 60% and, using argon/deuterium and neon/deuterium gas mixtures, runaway electron generation could be avoided. Most objectives of the ITER-like ICRH antenna have been demonstrated; matching with closely packed straps, ELM resilience, scattering matrix arc detection and operation at high power density (6.2 MW m-2) and antenna strap voltages (42 kV). Coupling measurements are in very good agreement with TOPICA modelling. © 2011 IAEA, Vienna.
  •  
4.
  • Morrison, Catriona A., et al. (författare)
  • Covariation in population trends and demography reveals targets for conservation action
  • 2021
  • Ingår i: Royal Society of London. Proceedings B. Biological Sciences. - : The Royal Society. - 1471-2954. ; 288:1946, s. 20202955-20202955
  • Tidskriftsartikel (refereegranskat)abstract
    • Wildlife conservation policies directed at common and widespread, but declining, species are difficult to design and implement effectively, as multiple environmental changes are likely to contribute to population declines. Conservation actions ultimately aim to influence demographic rates, but targeting actions towards feasible improvements in these is challenging in widespread species with ranges that encompass a wide range of environmental conditions. Across Europe, sharp declines in the abundance of migratory landbirds have driven international calls for action, but actions that could feasibly contribute to population recovery have yet to be identified. Targeted actions to improve conditions on poor-quality sites could be an effective approach, but only if local conditions consistently influence local demography and hence population trends. Using long-term measures of abundance and demography of breeding birds at survey sites across Europe, we show that co-occurring species with differing migration behaviours have similar directions of local population trends and magnitudes of productivity, but not survival rates. Targeted actions to boost local productivity within Europe, alongside large-scale (non-targeted) environmental protection across non-breeding ranges, could therefore help address the urgent need to halt migrant landbird declines. Such demographic routes to recovery are likely to be increasingly needed to address global wildlife declines.
  •  
5.
  •  
6.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2013
  • 2014
  • Ingår i: SOF 2014. Fågelåret 2013. - Halmstad : Swedish Ornithological Society. ; , s. 23-30
  • Tidskriftsartikel (populärvet., debatt m.m.)
  •  
7.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2014
  • 2015
  • Ingår i: Fågelåret 2014. - Halmstad : Sveriges Ornitologiska Förening. ; Suppl:55, s. 25-31
  • Tidskriftsartikel (populärvet., debatt m.m.)
  •  
8.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2015
  • 2016
  • Ingår i: Fågelåret 2015. - Halmstad : BirdLife Sverige - Sveriges Ornitologiska Förening. - 9789188124616 ; , s. 23-31
  • Bokkapitel (populärvet., debatt m.m.)
  •  
9.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2016
  • 2016
  • Ingår i: Fågelåret 2016. - Halmstad : BirdLife Sverige - Sveriges Ornitologiska Förening. - 9789188124630 ; , s. 23-31
  • Bokkapitel (populärvet., debatt m.m.)
  •  
10.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2017
  • 2018
  • Ingår i: Fågelåret 2017. - Halmstad : BirdLife Sverige - Sveriges Ornitologiska Förening. - 9789188124654 ; , s. 25-32
  • Bokkapitel (populärvet., debatt m.m.)
  •  
11.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2018
  • 2019
  • Ingår i: Fågfelåret 2018. - Halmstad : Sveriges Ornitologiska Förening - Birdlife Sverige 2019. - 9789188124661 ; , s. 25-33
  • Bokkapitel (populärvet., debatt m.m.)
  •  
12.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2019
  • 2020
  • Ingår i: Fågelåret 2019. - Halmstad : BirdLife Sverige. - 9789188124685 ; , s. 27-37
  • Bokkapitel (populärvet., debatt m.m.)
  •  
13.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2020
  • 2021
  • Ingår i: Fågelåret 2020. - Halmstad : BirdLife Sverige. - 9789188124708
  • Bokkapitel (populärvet., debatt m.m.)
  •  
14.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2021
  • 2022
  • Ingår i: Fågelåret 2021. - Halmstad : BirdLife Sverige. - 9789188124722 ; , s. 25-35
  • Bokkapitel (populärvet., debatt m.m.)
  •  
15.
  • Fransson, Thord, et al. (författare)
  • Svensk ringmärkning 2022
  • 2023
  • Ingår i: Fågelåret 2022. - Malmö : BirdLife Sverige - Sveriges Ornitologiska Förening. - 9789188124708 ; , s. 29-37
  • Bokkapitel (populärvet., debatt m.m.)
  •  
16.
  •  
17.
  • Piha, Markus, et al. (författare)
  • Constant Effort Sites (CES) in Finland and Sweden: Passerine population changes and productivity 1987–2019. (in Finnish with English summary)
  • 2020
  • Ingår i: Linnut Vuosikirja 2019. - Helsinki : BirdLife Finland. ; , s. 22-31
  • Bokkapitel (populärvet., debatt m.m.)abstract
    • The Constant Effort Sites scheme (CES) is amonitoring programme that is based on standardized mist-netting and provides data on population changes, productivity and survival of birds.The protocol was introduced in United Kingdom with the objective of 12 visits between May and August annually.This protocol was adapted for the Finnish(1986-) and Swedish (1996-) CES programmes. Annually, an average of 36 and 19 sites were active during the last decade in Finland and Sweden.In 26 species-specific diagrams, the upper figure is the smoothed population index for each country. Both smoothers average to 1, so annual levels of abundance between the two countries are not directly comparable, but the trends are. The lower figure gives the annual productivity indices for Finland (blue) and Sweden (red) with reference year 2004 for both countries.In summary, the population trends are generally similar between both countries and also generally similar with regard to trends derived from breeding bird survey data. Some interesting trend differences between the countries are evident, but the reasons for these differences are not easily explained.Productivity seems to be in surprisingly close synchrony between many species – and between Finland and Sweden especially during the most recent years. Spring temperature has been shown to act as a key factor determining the productivity of boreal passerine populations.
  •  
18.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-18 av 18

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy