107 research outputs found
Tree-based Forecasting of Day-ahead Solar Power Generation from Granular Meteorological Features
Accurate forecasts for day-ahead photovoltaic (PV) power generation are
crucial to support a high PV penetration rate in the local electricity grid and
to assure stability in the grid. We use state-of-the-art tree-based machine
learning methods to produce such forecasts and, unlike previous studies, we
hereby account for (i) the effects various meteorological as well as
astronomical features have on PV power production, and this (ii) at coarse as
well as granular spatial locations. To this end, we use data from Belgium and
forecast day-ahead PV power production at an hourly resolution. The insights
from our study can assist utilities, decision-makers, and other stakeholders in
optimizing grid operations, economic dispatch, and in facilitating the
integration of distributed PV power into the electricity grid
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Effect of a broccoli green manure, soil solarization, and isolates of Verticillium dahliae on Verticillium wilt of agronomic and nursery crops
Green manures, soil solarization, and long rotations with crops not susceptible to Verticillium wilt are among the disease management tactics currently under investigation as alternatives to chemical fumigation of soil. The effect of a broccoli green manure on soil microsclerotial populations of three isolates of Verticillium dahliae and on Verticillium wilt of peppermint, potato, and red maple was evaluated in a field study. Compared to the fallow control, soil populations of V. dahliae declined by at least 30% (P=0.0405) following the incorporation of a broccoli green manure (3.87-4.63 kg/mÂČ). Disease severity of potato was reduced by up to 40%, (P=0.0001); however, disease severity of peppermint was not affected by the broccoli green manure treatment. No symptoms of Verticillium wilt were observed in red maple. Potato tuber yield was up to 38% greater following the broccoli green manure compared to the fallow treatment (P=0.2484). The effects of a broccoli green manure and of soil solarization, individually and in combination, on soil populations of V. dahliae and on Verticillium wilt of royal purple smokebush and amur maple were examined in a field study. Following incorporation of the broccoli green manure (2.65 kg/mÂČ) and 2 mo of soil solarization, soil populations of V. dahliae were 40% less (P=0.0377) in plots that received the broccoli green manure treatment compared to fullowed plots, however, the solarization treatment did not affect soil populations on any sampling date. Disease severity of smokebush soon after symptom onset was 35% less (P=0.0264) in plots which were solarized compared to nonsolarized plots; however, the broccoli green manure treatment did not affect disease severity. Aggressiveness of three isolates of V. dahliae on potato, eggplant, and peppermint were evaluated in three field studies. An isolate recovered: from potato was more aggressive on potato than was an isolate recovered from maple (P=0.0329) and more aggressive on eggplant than were isolates obtained from maple and mint (P=0.0001). Mint and potato isolates were more aggressive on the host from which they were isolated than the mint isolate was to potato and vice versa. Inoculum density of the mint and potato isolates as a predictor of disease severity was significant only in the host: from which the isolate was recovered
Prompt dipole radiation in fusion reactions
The prompt gamma ray emission was investigated in the 16A MeV energy region
by means of the 36,40Ar+96,92Zr fusion reactions leading to a compound nucleus
in the vicinity of 132Ce. We show that the prompt radiation, which appears to
be still effective at such a high beam energy, has an angular distribution
pattern consistent with a dipole oscillation along the symmetry axis of the
dinuclear system. The data are compared with calculations based on a collective
bremsstrahlung analysis of the reaction dynamics
Understanding the Potential Impact of Multiple Robots in Odor Source Localization
We investigate the performance of three bio-inspired odor source localization algorithms used in non-cooperating multi-robot systems. Our performance metric is the distance overhead of the first robot to reach the source, which is a good measure for the speed of an odor source localization algorithm. Using the performance distribution of single-robot experiments, we calculate an ideal performance for multi-robot teams. We carry out simulations in a realistic robotic simulator and provide quantitative evidence of the differences between ideal and realistic performances of a given algorithm. A closer analysis of the results show that these differences are mainly due to physical interference among robots
Tracking Odor Plumes in a Laminar Wind Field with Bio-Inspired Algorithms
We introduce a novel bio-inspired odor source localization algorithm (surge- cast) for environments with a main wind ïŹow and compare it to two well-known algorithms. With all three algorithms, systematic experiments with real robots are carried out in a wind tunnel under laminar ïŹow conditions. The algorithms are compared in terms of distance overhead when tracking the plume up to the source, but a variety of other experimental results and some theoretical considerations are provided as well. We conclude that the surge-cast algorithm yields signiïŹcantly better performance than the casting algorithm, and slightly better performance than the surge-spiral algorithm
Transfert de moment angulaire dans les collisions trÚs inélastiques entre ions lourds
Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe
Quelle réponse humanitaire à l'insécurité alimentaire ? Etude de cas en région pastorale et agropastorale éthiopienne.
Le prĂ©sent mĂ©moire a pour objet gĂ©nĂ©ral lâanalyse des diffĂ©rentes formes dâactions humanitaires rĂ©pondant Ă lâinsĂ©curitĂ© alimentaire en rĂ©gion pastorale et agropastorale Somali dâEthiopie. Au travers des premiers chapitres, la recherche se dĂ©veloppe Ă partir de lâexploration de la notion de sĂ©curitĂ© alimentaire. LâĂ©tude aborde cette notion sous diffĂ©rents angles qui en soulignent les multiples dimensions, dĂ©terminants et acteurs qui serviront de points de dĂ©part Ă lâanalyse de lâaction humanitaire dans la rĂ©gion Ă©tudiĂ©e. Lâexploration de lâaction humanitaire dans le domaine de la sĂ©curitĂ© alimentaire vient ensuite complĂ©ter les prĂ©cĂ©dentes bases thĂ©oriques. Dans un second temps, la prĂ©sente recherche aborde le contexte propre Ă lâinsĂ©curitĂ© alimentaire en rĂ©gion Somali et les principaux protagonistes de la problĂ©matique : les populations insĂ©curisĂ©es, les acteurs Ă©tatiques et les acteurs humanitaires. Lâanalyse dĂ©montre que les acteurs humanitaires sont amenĂ©s Ă collaborer avec lâEtat au travers des cadres et structures mis en place par ce dernier. Par ailleurs, elle dĂ©montre la variĂ©tĂ© des actions humanitaires implĂ©mentĂ©es en rĂ©gion Somali dans le but de rĂ©pondre Ă lâinsĂ©curitĂ© alimentaire. Si lâaction humanitaire y aborde cette derniĂšre dans ses diffĂ©rentes dimensions et dĂ©montrent une bonne connaissance de celle-ci comme du terrain, lâanalyse souligne par ailleurs que peu des actions humanitaires menĂ©es incluent une approche sur le long terme afin de rĂ©duire les risques futurs. Cette recherche sous-tend ainsi un questionnement sur la dĂ©marche humanitaire et sur sa capacitĂ© Ă rendre les populations plus rĂ©silientes dans le domaine de la sĂ©curitĂ© alimentaire.Master [120] en sciences politiques, orientation relations internationales, UniversitĂ© catholique de Louvain, 201
Transfert de moment angulaire dans les collisions trÚs inélastiques entre ions lourds
Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe
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