Interface de visualisation innovante du Linked Data

Deux applications résultent de ce travail de Bachelor. La première est un outil utilisé pour extraire des données provenant du web sémantique. La deuxième application est capable de créer des visualisations en se basant sur des données au format JSON. L’outil d’administration est capable de récupérer des données issues de plusieurs points à la fois. Il permet à l’utilisateur de naviguer à l’intérieur de ces données et d’extraire les informations qu’il juge pertinentes. L’application de développement de visualisations importe des données avec lesquelles elle crée différentes visualisations. Par la suite, ces visualisations peuvent être déployées sur des sites internet et être consultées par les visiteurs. L’objectif principal de ces deux outils est de permettre d’utiliser les données appartenant au web sémantique d’une façon simple. Sans grande connaissance dans le domaine, l’utilisateur doit être en mesure de parcourir chacune des étapes jusqu’à la publication de visualisations

Les permis d’émission et les charges : efficacité et substituabilité

Cet article examine l’effet des technologies polluantes sur l’efficacité de l’échange des permis d’émissions. Nous démontrons que la capacité des entreprises à substituer les polluants, lorsqu’il y a absence de marché pour certains d’entre eux, fera probablement obstacle à l’efficacité dynamique normalement attribuée aux instruments de marché. Il est à noter que le régulateur dispose d’une mesure qui lui permet d’évaluer l’ampleur de ce problème. Par ailleurs, on examine la façon dont le gouvernement peut s’approprier la rente provenant de l’échange de permis alloués gratuitement. Nous comparons les effets de quatre méthodes d’appropriation de rente, soit une surcharge sur le prix des permis d’émission, une charge sur les profits, une charge sur le produit et une charge sur le transfert des permis d’émission. On démontre que ces méthodes d’appropriation de rente ont des effets différents sur l’efficacité des permis d’émission transférables. L’analyse de ces méthodes est faite dans un contexte où le régulateur fait face à de l’information imparfaite et où les entreprises peuvent substituer les polluants.This paper examines how the pollution generating technologies of firms affect the efficacy of tradeable emission permits. It is shown that the ability of firms to substitute among pollutants whenever markets are missing for a subset of pollutants is likely to prevent the dynamic efficiencies normally attributed to market based instruments. We argue that regulators have a readily implementable rule for assessing the extent of this problem. The paper also examines how the government may capture the scarcity rent that accrues to tradeable permits allocated gratis. We compare the effects of four possible methods of rent capture: an emissions permit rental charge, profit charge, output charge, and an emissions permit transfer charge. These methods of rent capture are shown to have different impacts on the efficiency of tradeable emission permits. The methods of rent capture are also examined whenever the regulator faces imperfect information and firms can substitute among pollutants

Application of MASCARET for modelling manganese dispersion during a dam-break flood

Water Qualit

Les permis d’émission et les charges : efficacité et substituabilité

This paper examines how the pollution generating technologies of firms affect the efficacy of tradeable emission permits. It is shown that the ability of firms to substitute among pollutants whenever markets are missing for a subset of pollutants is likely to prevent the dynamic efficiencies normally attributed to market based instruments. We argue that regulators have a readily implementable rule for assessing the extent of this problem. The paper also examines how the government may capture the scarcity rent that accrues to tradeable permits allocated gratis. We compare the effects of four possible methods of rent capture: an emissions permit rental charge, profit charge, output charge, and an emissions permit transfer charge. These methods of rent capture are shown to have different impacts on the efficiency of tradeable emission permits. The methods of rent capture are also examined whenever the regulator faces imperfect information and firms can substitute among pollutants. Cet article examine l’effet des technologies polluantes sur l’efficacité de l’échange des permis d’émissions. Nous démontrons que la capacité des entreprises à substituer les polluants, lorsqu’il y a absence de marché pour certains d’entre eux, fera probablement obstacle à l’efficacité dynamique normalement attribuée aux instruments de marché. Il est à noter que le régulateur dispose d’une mesure qui lui permet d’évaluer l’ampleur de ce problème. Par ailleurs, on examine la façon dont le gouvernement peut s’approprier la rente provenant de l’échange de permis alloués gratuitement. Nous comparons les effets de quatre méthodes d’appropriation de rente, soit une surcharge sur le prix des permis d’émission, une charge sur les profits, une charge sur le produit et une charge sur le transfert des permis d’émission. On démontre que ces méthodes d’appropriation de rente ont des effets différents sur l’efficacité des permis d’émission transférables. L’analyse de ces méthodes est faite dans un contexte où le régulateur fait face à de l’information imparfaite et où les entreprises peuvent substituer les polluants.

Discovery of planetary nebulae using predictive mid-infrared diagnostics

We demonstrate a newly developed mid-infrared planetary nebula (PN) selection technique. It is designed to enable efficient searches for obscured, previously unknown, PN candidates present in the photometric source catalogues of Galactic plane MIR sky surveys. Such selection is now possible via new, sensitive, high-to-medium resolution, MIR satellite surveys such as those from the Spitzer Space Telescope and the all-sky Wide-Field Infrared Survey Explorer (WISE) satellite missions. MIR selection is based on how different colour-colour planes isolate zones (sometimes overlapping) that are predominately occupied by different astrophysical object types. These techniques depend on the reliability of the available MIR source photometry. In this pilot study we concentrate on MIR point source detections and show that it is dangerous to take the MIR GLIMPSE (Galactic Legacy Infrared Mid-Plane Survey Extraordinaire) photometry from Spitzer for each candidate at face value without examining the actual MIR image data. About half of our selected sources are spurious detections due to the applied source detection algorithms being affected by complex MIR backgrounds and the de-blending of diffraction spikes around bright MIR point sources into point sources themselves. Nevertheless, once this additional visual diagnostic checking is performed, valuable MIR selected PN candidates are uncovered. Four turned out to have faint, compact, optical counterparts in our H-alpha survey data missed in previous optical searches. We confirm all of these as true PNe via our follow-up optical spectroscopy. This lends weight to the veracity of our MIR technique. It demonstrates sufficient robustness that high-confidence samples of new Galactic PN candidates can be extracted from these MIR surveys without confirmatory optical spectroscopy and imaging. This is problematic or impossible when the extinction is large.Comment: 14 pages, 7 figures, 7 tables; accepted for publication in MNRA

Electrical investigation of natural lawsonite and application to subduction contexts

Author Posting. © American Geophysical Union, 2019. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research-Solid Earth 142(2), (2019):1430-1442, doi:10.1029/2018JB016899.We report an experimental investigation of the electrical properties of natural polycrystalline lawsonite from Reed Station, CA. Lawsonite represents a particularly efficient water reservoir in subduction contexts, as it can carry about 12 wt % water and is stable over a wide pressure range. Experiments were performed from 300 to about 1325 °C and under pressure from 1 to 10 GPa using a multi‐anvil apparatus. We observe that temperature increases lawsonite conductivity until fluids escape the cell after dehydration occurs. At a fixed temperature of 500 °C, conductivity measurements during compression indicate electrical transitions at about 4.0 and 9.7 GPa that are consistent with crystallographic transitions from orthorhombic C to P and from orthorhombic to monoclinic systems, respectively. Comparison with lawsonite structure studies indicates an insignificant temperature dependence of these crystallographic transitions. We suggest that lawsonite dehydration could contribute to (but not solely explain) high conductivity anomalies observed in the Cascades by releasing aqueous fluid at a depth (~50 km) consistent with the basalt‐eclogite transition. In subduction settings where the incoming plate is older and cooler (e.g., Japan), lawsonite remains stable to great depth. In these cooler settings, lawsonite could represent a vehicle for deep water transport and the subsequent triggering of melt that would appear electrically conductive, though it is difficult to uniquely identify the contributions from lawsonite on field electrical profiles in these more deep‐seated domains.A. P. acknowledges financial support from UCSD‐SIO startup funds, NSF‐EAR Petrology and Geochemistry (grant 1551200), and NSF‐COMPRES IV EOID subaward. The use of the COMPRES Cell Assembly Project was also supported by COMPRES under NSF Cooperative Agreement EAR 1661511. Q. W. acknowledges support from NSF EAR‐1620423. We thank Kurt Leinenweber for fruitful discussion, Jake Perez for technical help in the lab, and Sabine Faulhaber (UCSD Nano‐Engineering Department) for technical assistance with SEM images and EDS analyses. We also thank two reviewers for detailed comments that improved the manuscript. All the electrical data used for Figures 4 and 5 are available in the supporting information.2019-08-2

Increasing understanding of alien species through citizen science (Alien-CSI)

There is no sign of saturation in accumulation of alien species (AS) introductions worldwide, additionally the rate of spread for some species has also been shown to be increasing. However, the challenges of gathering information on AS are recognized. Recent developments in citizen science (CS) provide an opportunity to improve data flow and knowledge on AS while ensuring effective and high quality societal engagement with the issue of IAS (Invasive Alien Species). Advances in technology, particularly on-line recording and smartphone apps, along with the development of social media, have revolutionized CS and increased connectivity while new and innovative analysis techniques are emerging to ensure appropriate management, visualization, interpretation and use and sharing of the data. In early July 2018 we launched a European CO-operation in Science and Technology (COST) Action to address multidisciplinary research questions in relation to developing and implementing CS, advancing scientific understanding of AS dynamics while informing decision-making specifically implementation of technical requirements of relevant legislation such as the EU Regulation 1143/2014 on IAS. It will also support the EU biodiversity goals and embedding science within society. The Action will explore and document approaches to establishing a European-wide CS AS network. It will embrace relevant innovations for data gathering and reporting to support the implementation of monitoring and surveillance measures, while ensuring benefits for society and citizens, through an AS CS European network. The Action will, therefore, increase levels of participation and quality of engagement with current CS initiatives, ensuring and evaluating educational value, and improve the value outcomes for potential users including citizens, scientists, alien species managers, policy-makers, local authorities, industry and other stakeholders

An adaptive multi-agent system for task reallocation in a MapReduce job

International audienceWe study the problem of task reallocation for load-balancing of MapReduce jobs in applications that process large datasets. In this context, we propose a novel strategy based on cooperative agents used to optimise the task scheduling in a single MapReduce job. The novelty of our strategy lies in the ability of agents to identify opportunities within a current unbalanced allocation, which in turn trigger concurrent and one-to-many negotiations amongst agents to locally reallocate some of the tasks within a job. Our contribution is that tasks are reallocated according to the proximity of the resources and they are performed in accordance to the capabilities of the nodes in which agents are situated. To evaluate the adaptivity and responsiveness of our approach, we implement a prototype test-bed and conduct a vast panel of experiments in a heterogeneous environment and by exploring varying hardware configurations. This extensive experimentation reveals that our strategy significantly improves the overall runtime over the classical Hadoop data processing

Predictors of Implantable Pulse Generator Placement After Sacral Neuromodulation: Who Does Better?

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/107552/1/ner12109.pd