Literatura académica sobre el tema "Fusion de traces"
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Artículos de revistas sobre el tema "Fusion de traces"
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Schaumann, Gregor. "Traces on module categories over fusion categories". Journal of Algebra 379 (abril de 2013): 382–425. http://dx.doi.org/10.1016/j.jalgebra.2013.01.013.
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Han, Lei, Ping Duan, Jiajia Liu y Jia Li. "Research on Landslide Trace Recognition by Fusing UAV-Based LiDAR DEM Multi-Feature Information". Remote Sensing 15, n.º 19 (28 de septiembre de 2023): 4755. http://dx.doi.org/10.3390/rs15194755.
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Landslide traces are crucial geomorphological features of landslides. Through the recognition of landslide traces, a better grasp of the topographical features of landslides can be achieved, thereby aiding in the enhancement of capabilities for the prevention, response, and management of landslides. Aiming at the complex topographic features of landslide traces, only using a single DEM product could provide a complete and comprehensive recognition of landslide traces. A method of landslide tracing recognition based on the fusion of multi-feature information from the Unmanned Aerial Vehicle-based Light Detection and Ranging (UAV-based LiDAR) Digital Elevation Model (DEM) is proposed. First, a high-precision DEM is constructed by using the LiDAR point cloud data. Based on the DEM, four multi-feature images that can enhance the landslide geomorphology are generated: hillshading, slope, positive openness, and sky-view factor. Furtherore, the DEM multi-feature images were fused using the Visualization for Archaeological Topography (VAT) method to obtain the DEM Multi-Feature Fusion Image (DEM-DFFI). Finally, the landslide traces were extracted from the DEM-DFFI based on fractal theory. The method presented in this paper makes full use of DEM multi-feature images and fuses them, which can accurately and clearly show the topographic and geomorphological features of landslides. Based on this, it helps improve landslide trace recognition accuracy.
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Xue, Ziyu, Xiuhua Jiang, Qingtong Liu y Zhaoshan Wei. "Global–Local Facial Fusion Based GAN Generated Fake Face Detection". Sensors 23, n.º 2 (5 de enero de 2023): 616. http://dx.doi.org/10.3390/s23020616.
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Media content forgery is widely spread over the Internet and has raised severe societal concerns. With the development of deep learning, new technologies such as generative adversarial networks (GANs) and media forgery technology have already been utilized for politicians and celebrity forgery, which has a terrible impact on society. Existing GAN-generated face detection approaches rely on detecting image artifacts and the generated traces. However, these methods are model-specific, and the performance is deteriorated when faced with more complicated methods. What’s more, it is challenging to identify forgery images with perturbations such as JPEG compression, gamma correction, and other disturbances. In this paper, we propose a global–local facial fusion network, namely GLFNet, to fully exploit the local physiological and global receptive features. Specifically, GLFNet consists of two branches, i.e., the local region detection branch and the global detection branch. The former branch detects the forged traces from the facial parts, such as the iris and pupils. The latter branch adopts a residual connection to distinguish real images from fake ones. GLFNet obtains forged traces through various ways by combining physiological characteristics with deep learning. The method is stable with physiological properties when learning the deep learning features. As a result, it is more robust than the single-class detection methods. Experimental results on two benchmarks have demonstrated superiority and generalization compared with other methods.
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Matsumoto, Takaaki. "Observation of Meshlike Traces on Nuclear Emulsions during Cold Fusion". Fusion Technology 23, n.º 1 (enero de 1993): 103–13. http://dx.doi.org/10.13182/fst93-a30125.
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Keen, B. E. y M. L. Watkins. "Present State of Nuclear Fusion Research and Prospects for the Future". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 207, n.º 4 (noviembre de 1993): 269–78. http://dx.doi.org/10.1243/pime_proc_1993_207_049_02.
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This paper traces the development of nuclear fusion research and describes the basic principles involved. The most advanced device used to achieve controlled thermonuclear fusion is the magnetic confinement approach, utilizing the tokamak concept. The Joint European Torus (JET) is the largest tokamak in operation. The operating conditions are described and critical issues outlined. With concerted effort and international collaboration the possibility exists to produce a demonstration reactor.
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Gorochov, A. V. "No evidence for Paleozoic origin of mantises (Dictyoptera: Mantina)". Zoosystematica Rossica 22, n.º 1 (25 de junio de 2013): 6–14. http://dx.doi.org/10.31610/zsr/2013.22.1.6.
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The hypothesis of Paleozoic origin of mantises recently proposed by Béthoux & Wieland is discussed. It is shown that these authors reject the logical scenario of evolution of the main higher taxa in the order Dictyoptera, well grounded by the morphological, paleontological and molecular data, in favor of the opposite one based on two very feeble assumptions: about inexplicable importance of one of the very common fusions of veins RS and MA in the tegmina of one of the Carboniferous polyneopterans, and about some traces of basal fusion of RS and M ostensibly present in the tegmina of recent mantises. Arguments against these views are considered.
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Stankowski, Wojciech T. J. "The crust structure of the Morasko meteorite – a preliminary hypothesis". Geologos 23, n.º 1 (1 de marzo de 2017): 53–56. http://dx.doi.org/10.1515/logos-2017-0005.
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Abstract A small piece of the Morasko meteorite, weighing 970 g, yields traces of its journey through the Earth’s atmosphere and of its impact into a mineral substrate, such as reflected in the meteorite’s crust. This is seen in the crust structure in the form of sintered as well as fusion and semi-fusion layers for which ablative niches are optimum sites. Subsequent weathering processes have resulted in significant mineralogical changes in the crusts. The meteorite crusts originated during polygenetic processes.
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Lampert, K. P. y M. Schartl. "The origin and evolution of a unisexual hybrid: Poecilia formosa". Philosophical Transactions of the Royal Society B: Biological Sciences 363, n.º 1505 (28 de mayo de 2008): 2901–9. http://dx.doi.org/10.1098/rstb.2008.0040.
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Clonal reproduction in vertebrates can always be traced back to hybridization events as all known unisexual vertebrates are hybrids between recognized species or genetically defined races. Interestingly, clonal vertebrates often also rely on interspecific matings for their reproduction because gynogenesis (sperm-dependent parthenogenesis) and hybridogenesis are common modes of propagation. While in most cases these hybridization events leave no hereditary traces in the offspring, occasionally the genome exclusion mechanism fails and either small parts of male genetic material remain inside the oocyte in the form of microchromosomes, or fusion of the sperm nucleus with the oocyte nucleus leads to polyploid individuals. In this review, we highlight the important role of hybridization for the origin and evolution of a unisexual hybrid: the Amazon molly, Poecilia formosa .
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BÁNTAY, PETER y PETER VECSERNYÉS. "MAPPING CLASS GROUP REPRESENTATIONS AND GENERALIZED VERLINDE FORMULA". International Journal of Modern Physics A 14, n.º 09 (10 de abril de 1999): 1325–35. http://dx.doi.org/10.1142/s0217751x99000683.
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Unitary representations of centrally extended mapping class groups [Formula: see text], g ≥ 1 are given in terms of a rational Hopf algebra H, and a related generalization of the Verlinde formula is presented. Formulae expressing the traces of mapping class group elements in terms of the fusion rules, quantum dimensions and statics phases are proposed.
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Oelkers, Marieelen, Hannes Witt, Partho Halder, Reinhard Jahn y Andreas Janshoff. "SNARE-mediated membrane fusion trajectories derived from force-clamp experiments". Proceedings of the National Academy of Sciences 113, n.º 46 (2 de noviembre de 2016): 13051–56. http://dx.doi.org/10.1073/pnas.1615885113.
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Fusion of lipid bilayers is usually prevented by large energy barriers arising from removal of the hydration shell, formation of highly curved structures, and, eventually, fusion pore widening. Here, we measured the force-dependent lifetime of fusion intermediates using membrane-coated silica spheres attached to cantilevers of an atomic-force microscope. Analysis of time traces obtained from force-clamp experiments allowed us to unequivocally assign steps in deflection of the cantilever to membrane states during the SNARE-mediated fusion with solid-supported lipid bilayers. Force-dependent lifetime distributions of the various intermediate fusion states allowed us to propose the likelihood of different fusion pathways and to assess the main free energy barrier, which was found to be related to passing of the hydration barrier and splaying of lipids to eventually enter either the fully fused state or a long-lived hemifusion intermediate. The results were compared with SNARE mutants that arrest adjacent bilayers in the docked state and membranes in the absence of SNAREs but presence of PEG or calcium. Only with the WT SNARE construct was appreciable merging of both bilayers observed.
Tesis sobre el tema "Fusion de traces"
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Schneider, Arnaud. "Comportement et mobilité des éléments traces métalliques dans des sols environnant une usine de seconde fusion du plomb. Approches expérimentales et modélisation". Thesis, Reims, 2016. http://www.theses.fr/2016REIMS043/document.
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La contamination en éléments traces métalliques (ETM) des sols constitue un problème environnemental majeur qui réside principalement dans le risque de leur transfert vers les eaux superficielles et souterraines et/ou vers la chaîne alimentaire. L’objectif principal de ce travail était de comprendre le comportement des ETM dans des sols impactés par une usine de recyclage de batteries au plomb localisée dans les Ardennes. Sur une zone de 17 ha environnant l’usine, la répartition spatiale des teneurs en ETM étudiée par fluorescence X portable a révélé que les sols étaient majoritairement impactés par Pb et dans une moindre mesure par Cd, Cu, Ni, Sb, Sn et Zn. Une méthode géostatistique a permis d’identifier l’origine industrielle ou lithogénique de la plupart des ETM précédemment cités. A partir de cette cartographie, de la nature des sols et du mode d’occupation, le comportement des ETM a été étudié le long de six profils pédologiques. Le calcul des coefficients de distribution a permis de mettre en évidence une mobilité importante des ETM liée au caractère acide des sols (pH 4-5). Quel que soit le profil étudié, Cd présentait la mobilité la plus élevée, suivi de Zn, Ni, Pb et Cu. Le couplage de méthode expérimentale (soil-column Donnan membrane technique) et de modélisation géochimique a permis de préciser que Cd, Ni et Zn étaient totalement sous forme libre, Pb majoritairement sous forme libre mais également associé aux acides fulviques et Cu principalement associé aux acides fulviques dans la solution du sol. La répartition de Pb dans la phase solide des horizons de surface a également été déterminée en combinant des méthodes chimiques (extractions séquentielles), des méthodes physiques (MEB-EDS, microspectrométrie Raman) et de la modélisation. Le plomb était majoritairement associé à la matière organique et, dans une moindre mesure, aux oxydes de manganèse. Aucune des phases cristallines riches en plomb potentiellement émises par ce type d’industrie n’a été identifiée, ce qui suggère que Pb a été redistribué dans les sols à partir de ces phases. Ce travail insiste sur l’importance de l’étude conjointe des sols et de leur solution pour mieux comprendre le comportement des ETM, évaluer les risques et proposer d’éventuelles solutions de remédiationThe soil contamination by trace elements (TE) is a major environmental issue which mainly lies in their potential transfers from soils to surface and ground waters and/or to food chain.The main objective of this study was to understand the behaviour of TE in impacted soils located in the vicinity of a lead-acid battery recycling plant (Ardennes, France). In a 17 ha surrounding area, the spatial distribution of TE was performed using portable X-ray fluorescence. It indicated that the soils were mainly contaminated by Pb and, to a lesser degree, by Cd, Cu, Ni, Sb, Sn and Zn. A geostatistical approach enabled to discriminate the natural or anthropogenic sources of most of these TE.Based on the TE mapping, the soil type and the land cover, the behaviour of the TE was studied along six soil profiles. The calculated partition coefficients highlighted a high mobility of the TE which is related to the acidic soil conditions (pH 4-5). Regardless of the studied soil profile, Cd exhibited the highest mobility, followed by Zn, Ni, Pb and Cu. A combined experimental (soil-column Donnan membrane technique) and modelling approach helped to specify that Cd, Ni and Zn occurred as free ions, Pb mainly occurred as free ion and associated to fulvic acids and Cu was mainly associated to fulvic acids in the soil solutions. The distribution of Pb among the soil components of upper soil horizons was also determined using chemical methods (sequential extraction), physical methods (SEM-EDS, Raman microspectroscopy) and modelling. Lead was mainly associated with soil organic matter and to a lesser extent with manganese oxides. None of the Pb-bearing phases potentially emitted by the recycling plant were identified, suggesting a remobilization of Pb in the studied soils after smelter particles deposition. This work emphasizes the importance of studying the soil and its solution to better understand the behaviour of TE, to assess the environmental risks and to suggest remediation strategies
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Paganelli, Emanuele. "Melt percolation and stagnation in a cold suboceanic mantle (Andrew Bain transform fault, southwest indian ridge)". Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10026/document.
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Les processus pétrologiques profonds, qui précèdent ou accompagnent la décompression du manteau sous les dorsales océaniques, tendent à être oblitérés par la fusion partielle. Les régions de dorsales à vitesse d'expansion très lente et/ou anormalement froides exposent des domaines mantelliques qui ont subi un degré de fusion extrêmement faible et donc permettent d'accéder à ces processus. La zone de fracture de Andrew Bain, située à la limite des plaques Africaine et Antarctique, en est un exemple remarquable. Son massif d'intersection avec la dorsale sud-ouest indienne a été exploré au cours de l'expédition océanographique italo-russe S23-AB06. Les échantillons qui ont été prélevés sont principalement des péridotites mantelliques à spinelle ± plagioclase, contenant des plages et des veinules enrichies en pyroxènes ± plagioclase, et montrant des textures de réquilibrages minéralogiques. Les concentrations en éléments majeurs et en traces des pyroxènes, mesurés in situ par EMPA et LA-ICP-MS, montrent une grande variabilité de compositions, identique à toutes les échelles, du massif à la lame mince. La modélisation des compositions des pyroxènes des péridotites indique (1) une cristallisation à partir de liquides de fusion de lithologies enrichies en éléments incompatibles, générés dans un large intervalle de pression débutant dans le faciès à grenat, (2) un rééquilibrage progressif à des conditions de P-T décroissantes, par interaction péridotite - liquide et diffusion à l'état solide. Le modèle est celui d'une refertilisation d'un manteau lithosphérique épais, similaire à celui qui caractérise les domaines de transition continent-océanAndrew Bain Fracture Zone represents one of the largest transform faults in the ridge system. Located on the South West Indian Ridge, it constitutes part of the plate margin between Africa and Antarctica. In this area, the lithosphere is thick and mainly constituted by ultramafic rocks; the system is characterized by a negative thermal anomaly. During the Italian-Russian expedition S23-AB06, the seafloor in the Southern Ridge Transform Intersection has been sampled and almost only ultramafic material has been recovered. The sampled spinel and plagioclase peridotites show hybrid textures and are characterized by deep spinel-field impregnation assemblages and by plagioclase-field equilibrated patches and mineral trails marked by crystallization of newly formed plagioclase-field equilibrated trails and formation of plagioclase coronas around pristine spinel. Major and trace element data composition have been collected. Both spinel- and plagioclase-peridotite pyroxenes and spinels follow a main melting trend accompanied by a progressive re-equilibration to lower P/T facies. Thin section-scale variability matches inter-site compositional variability. Progressive re-equilibration to lower P/T conditions can be accounted for by the presence of percolating melts and solid diffusion. Major and trace element shows that percolating melts are generated over a wide pressure range and modeling suggests melting started in garnet stability field but stopped early due to the lithospheric cooling. Thus, this mantle seems to be a thermically “normal” mantle cooled down from above by the anomalous thickness of the old lithosphere, similar to those characterizing continent-ocean transition
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Syed, Mohammad Imran. "Wireless passive measurements : tool, redundancy, measurements, and analyses". Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS265.
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La compréhension du trafic sans fil est fondamentale pour améliorer les réseaux et concevoir des algorithmes et des protocoles avancés. Dans ce contexte, les mesures passives ont l'avantage sur les mesures actives, car elles ne dépendent d'aucune modification des équipements réseau existants. Elles sont souvent moins coûteuses et plus faciles à déployer que d'autres méthodes. Cette approche consiste à surveiller le support sans fil et à collecter des données sur divers paramètres de réseau, tels que la force du signal, l'occupation des canaux et la perte de paquets. Elle consiste à déployer plusieurs sniffeurs dans la zone cible (les sniffeurs sont des dispositifs fonctionnant en « monitor mode » qui collectent les paquets sans fil indépendamment de leur nature). Cependant, l'un des principaux défis des mesures passives est d'assurer la complétude de la trace, c'est-à-dire la capacité à collecter un ensemble de données complet et précis. Nous montrons qu'un seul sniffeur ne peut pas capturer tout le trafic en raison des caractéristiques inhérentes du support sans fil, où l'environnement peut être hautement dynamique et imprévisible. Il existe plusieurs facteurs qui peuvent affecter la complétude de la trace dans les mesures passives sans fil. Celles-ci incluent des facteurs environnementaux, tels que les interférences provenant d'autres dispositifs sans fil, les changements dans l'environnement physique (comme les objets en mouvement) et les variations de propagation du signal sans fil dues aux changements des conditions atmosphériques. De plus, des problèmes avec l'équipement de mesure lui-même, tels que des erreurs de calibration ou des problèmes de traitement des données, peuvent également affecter la complétude de la trace. L'importance de la complétude de la trace dans les mesures passives sans fil ne peut être surestimée. Des données inexactes ou incomplètes peuvent conduire à des conclusions incorrectes sur les performances du réseau, ce qui peut avoir des implications significatives pour la planification, l'optimisation et le dépannage du réseau. Par exemple, des données incomplètes peuvent entraîner des opportunités manquées pour identifier et résoudre des problèmes de réseau, ainsi qu'une reconstruction de trajectoire incorrecte ou incomplète. Dans cette thèse, nous étudions la qualité des traces capturées par des sniffeurs et examinons les améliorations résultantes en introduisant de la redondance dans le nombre de sniffeurs. Nous étudions l'impact des deux aspects suivants sur la qualité des traces sans fil : le nombre de sniffeurs et le type de matériel utilisé. Nous étudions la variation de l'indicateur de force du signal reçu (RSSI) et son impact sur l'estimation de la distance. L'analyse est facilitée par le développement d'un outil facilement utilisable et disponible appelé PyPal pour la synchronisation et la fusion de traces Wi-Fi collectées simultanémentUnderstanding wireless traffic is fundamental for improving networks and designing advanced algorithms and protocols. In this context, passive measurements have the edge over active measurements, as there is no requirement for any modification in existing network devices. Passive measurements are often less expensive and easier to deploy than other methods. This approach involves monitoring the wireless medium and collecting data on various network parameters, such as signal strength, channel occupancy, and packet loss. It consists of deploying multiple sniffers throughout the target area (sniffers are devices operating in monitor mode that collect the wireless packets regardless of their nature). However, one of the main challenges with passive measurements is ensuring trace completeness, or the ability to collect a complete and accurate dataset. We know that a single sniffer cannot capture all the traffic due to the inherent characteristics of the wireless medium where the environment can be highly dynamic and unpredictable. Several factors can impact trace completeness in wireless passive measurements. These include environmental factors, such as interference from other wireless devices, changes in the physical environment (such as moving objects), and variations in wireless signal propagation due to changes in atmospheric conditions. Additionally, issues with the measurement equipment itself, such as calibration errors or data processing issues, can also impact trace completeness. The importance of trace completeness in wireless passive measurements cannot be overstated. Inaccurate or incomplete data can lead to incorrect conclusions about network performance, which can have significant implications for network planning, optimization, and troubleshooting. For example, incomplete data can result in missed opportunities to identify and address network issues, and incorrect or incomplete trajectory reconstruction. In this thesis, we study the quality of traces captured by a sniffer and investigate the resulting improvements by introducing redundancy in the number of sniffers. We explore the impact of the following two aspects on the quality of wireless traces: the number of sniffing devices and the type of hardware used. We study the variation in the Received Signal Strength Indicator (RSSI) and its impact on distance estimation. The analysis is helped by the development of a readily-usable and easily-available tool, called PyPal, for the synchronization and merging of Wi-Fi traces collected simultaneously
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Laubier, Muriel. "L'apport des inclusions magmatiques primitives à l'origine des basaltesocéaniques : Exemples de la zone FAMOUS (ride médio-Atlantique Nord)et du point chaud de la Réunion". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2006. http://tel.archives-ouvertes.fr/tel-00155657.
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La caractérisation des magmas primitifs des laves a pour objectif de mieux contraindre les conditions physico-chimiques de la fusion partielle, les modes d'extraction et de transport des magmas et la composition chimique et minéralogique du manteau terrestre. L'intérêt de l'étude des inclusions magmatiques piégées dans les phénocristaux précoces des basaltes réside dans l'isolation de ces liquides silicatés vis à vis des processus secondaires de différenciation et de mélange. Ce travail avait pour but la caractérisation des inclusions magmatiques dans des olivines primitives dans deux contextes géodynamiques distincts - les rides médio-océaniques et les points chauds océaniques – en s'articulant autour de deux exemples régionaux : la zone FAMOUS (ride médio-Atlantique Nord) et le point chaud de la Réunion.Les inclusions magmatiques piégées dans un échantillon de la zone FAMOUS (ride médio-Atlantique Nord) se caractérisent par une variabilité importante de leurs teneurs en éléments majeurs et traces, qui excède largement la variabilité chimique des laves émises en surface dans la région. Les liquides inclus sont très primitifs (Mg# = 0.70-0.78) et présentent des similitudes de composition avec les liquides expérimentaux issus de la fusion partielle de lherzolites à spinelle à 1 GPa. Les compositions en éléments en traces évoluent depuis des compositions relativement appauvries ((La/Sm)N<0.75) jusqu'à des compositions légèrement enrichies ((La/Sm)N>1.2). Des modélisations géochimiques suggèrent qu'une grande part de la diversité chimique des inclusions résulte du processus de fusion polybare d'une source de composition homogène. Toutefois, une variation locale de la température potentielle et de la teneur en H2O du manteau semble requise pour reproduire certaines variations en éléments majeurs. Nous n'avons pas décelé de modifications chimiques des magmas liées à des interactions magma/roche (dissolution du clinopyroxène) lors de la ségrégation et l'ascension.
L'étude des inclusions magmatiques dans les olivines d'échantillons de l'île Maurice et l'île de la Réunion a mis en évidence une transition entre des liquides alcalins à transitionnels vers des basaltes à affinité tholéiitique. Cette évolution peut vraisemblablement être expliquée par une augmentation du degré de fusion d'une source péridotitique. D'autre part, la composition chimique et isotopique homogène au cours du temps du panache de la Réunion nous a autorisés à calculer la séquence d'incompatibilité des éléments traces lors du processus de fusion partielle à l'origine des liquides inclus. Les résultats indiquent un comportement très incompatible du Pb, alors que celui-ci est généralement considéré comme voisin du celui du Ce lors de la fusion dans un environnement océanique. Cette observation implique l'absence de sulfure résiduel dans la source du panache lors de l'extraction des magmas, ce qui singulariserait la source du panache de la Réunion des autres sources d'îles océaniques. Enfin, une modélisation de la source du panache suggère une composition relativement comparable à celle du manteau primitif, mais toutefois légèrement appauvrie en éléments les plus incompatibles. Ainsi, la source de la Réunion est constituée d'un manteau faiblement appauvri par l'extraction de la croûte continentale, qui, par la suite, n'a pas ou peu été modifié par les processus de différenciation ou de recyclage.
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Pelleter, Anne-Aziliz. "Cycle géodynamique du soufre : le rôle des sédiments subduits". Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2060/document.
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Dans l’objectif d’évaluer le devenir de sédiments subduits variablement enrichis en soufre dans des conditions P-T (pression – température) correspondant au toit de la plaque sous un arc volcanique, des expériences de fusion et de cristallisation ont été réalisées en conditions hydratées en presse piston-cylindre(3 GPa ; 650 – 1000°C ; ƒO2 ~ NNO) sur des sédiments naturels (pélite et marne), non dopés en éléments en traces et variablement enrichis en soufre (0, 1 et 2 wt% Sin). Lors de la fusion du sédiment pélitique, des liquides trondhjémitiques à granitiques sont produits en équilibre avec un résidu composé de grenat +disthène ± phengite ± quartz + rutile. Lors de la fusion du sédiment marneux, des liquides granodioritiques sont produits en équilibre avec un résidu constitué de grenat ± épidote ± clinopyroxène ± disthène ± quartz +rutile. L’ajout de soufre dans le système pour une ƒO2 ~ NNO conduit à une précipitation de sulfures. La quantité de fer (Fe2+) disponible dans le système diminue fortement (augmentation du Mg#) et impactegrandement les relations de phases : le grenat, l’épidote et la phengite sont déstabilisées au profit des pyroxènes, de la biotite ou encore de l’amphibole. La distribution des éléments en traces dans le liquide silicaté par rapport au sédiment de départ est également très affectée pour les systèmes dopés en soufre(ex : fractionnement des terres rares). Nous proposons, à partir des données obtenues dans des xénolites mantelliques (Grenade, Petites Antilles) et lors de modélisations géochimiques, que la contribution dans lecoin mantellique de 1 à 3 % de liquides trondhjémitiques/granitiques issus de la fusion de sédiments pélitiques modérément enrichis en soufre (≤ 1 wt% Sin) peut expliquer la variabilité de composition des basaltes du sud de l’arc des Petites Antilles (Grenade et Grenadines)The main issue of this study is to constrain the fate of subducted sediments variably enriched in sulphur for P-T (pressure – temperature) relevant for the slab at sub-arc depth. Using piston-cylinder apparatus, we performed melting and crystallisation experiments (3 GPa; 650 – 1000°C; ƒO2 ~ NNO) on natural, trace elementundoped and volatile-rich sediments (pelite and marlstone). Experiments were conducted with variable water (5 to 10 wt% H2Oin) and sulphur (0, 1 and 2 wt% Sin) contents. Silicate melts produced by the fluid-present melting of pelite range from trondhjemitic to granitic compositions, are broadly peraluminous and coexist with garnet + kyanite ± phengite ± quartz + rutile. Those produced by the fluid-present melting of marlstone are sodic (granodioritic composition), metaluminous to slightly peraluminous and coexist with garnet ± epidote ± clinopyroxene ± kyanite ± quartz + rutile. Sulphur addition at ƒO2 ~ NNO leads to sulphide precipitation. Thus, iron (Fe2+) contents decrease (Mg# increase) in the system and this strongly impacts phase relationships: garnet, epidote and phengite are consumed in favour of pyroxens, biotite and amphibole. Trace-element distribution between silicate melt and starting bulk for S-doped systems is largely impacted (e.g. rare earth elements fractionation). On the basis of data obtained in mantle xenoliths(Grenada, Lesser Antilles) and from geochemical modelisations, we are suggesting that a contribution in the mantle wedge of 1 to 3 % of trondhjemitic/granitic melts derived from pelitic sediments (≤ 1 wt% Sin) mayaccount for the composition of basalts in the southern part of Lesser Antilles (Grenada and Grenadines)
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Dalou, Célia. "Fluorine and chlorine fractionation in the sub-arc mantle : an experimental investigation". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2011. http://tel.archives-ouvertes.fr/tel-00657297.
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Volatile elements released from the subducting slab play a fundamental role during the formation of arc magmas in the mantle wedge. Advances of melt inclusion studies enlarged the data on volatile abundance in arc magmas, and it is now possible to characterize some volatile contents in arc primary magmas, in particular F and Cl. A recent study of Mt Shasta melt inclusions (LeVoyer et al., 2010) shows that fractionation of F and Cl potentially contains information about arc magma genesis. In order to trace the source of arc magmas, fluorine and chlorine partitioning was investigated. Here, I present new experimental determinations of Cl and F partition coefficients between dry and hydrous silicate melts and mantle minerals: olivine, orthopyroxene, clinopyroxene, plagioclase, garnet and also pargasite and phlogopite. The values were compiled from more than 300 measurements in 24 melting experiments, conducted between 8 and 25 kbars and between 1180 and 1430˚C. The low abundance F, Cl measurements in minerals were done by Cameca IMF 1280 at WHOI using the negative secondary ion mode. The results show that DOpx/meltF ranges from 0.123 to 0.021 and DCpx/meltF ranges from 0.153 to 0.083, while Cl partition coefficient varies from DOpx/meltCl from 0.002 to 0.069 and DCpx/meltCfrom 0.008 to 0.015, as well. Furthermore, DOl/meltF ranges from 0.116 to 0.005 and DOl/meltCl from 0.001 to 0.004; DGrt/meltF ranges from 0.012 to 0.166 and DGrt/meltCl from 0.003 to 0.087 with the increasing water amount and decreasing temperature. I also show that F is compatible in phlogopite DPhl/meltF > 1.2) while DAmp/meltF is incompatible in pargasite DAmp/meltF from 0.36 to 0.63). On the contrary, Cl is more incompatible in phlogopite (DPhl/meltCl > 1.2 on average 0.09 ± 0.02), than in pargasite (DPhl/meltCl from 0.12 to 0.38). This study demonstrates that F and Cl are substituted in specific oxygen site in minerals that lead then to be more sensitive than trace elements to crystal chemistry and water amount variations thus melting conditions. Using those new partition coefficients, I modelled melting of potential sub-arc lithologies with variable quantity aqueous-fluid. This model is able to decipher 1) amount of aqueous-fluid involved in melting, 2) melting induced by fluid or melting of an hydrous mineral-bearing source and 3) melting of either pargasite-bearing lithology or phlogopite-bearing lithology and shows that sources of some primitive melts, for instance from Italy, bear pargasite and phlogopite, while some primitve melts seem to be the results of fluid-induced melts.
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Krieger, Evan. "Adaptive Fusion Approach for Multiple Feature Object Tracking". University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton15435905735447.
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Leang, Isabelle. "Fusion en ligne d'algorithmes de suivi visuel d'objet". Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066486/document.
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Le suivi visuel d’objet est une fonction élémentaire de la vision par ordinateur ayant fait l’objet de nombreux travaux. La dérive au cours du temps est l'un des phénomènes les plus critiques à maîtriser, car elle aboutit à la perte définitive de la cible suivie. Malgré les nombreuses approches proposées dans la littérature pour contrer ce phénomène, aucune ne surpasse une autre en terme de robustesse face aux diverses sources de perturbations visuelles : variation d'illumination, occultation, mouvement brusque de caméra, changement d'aspect. L’objectif de cette thèse est d’exploiter la complémentarité d’un ensemble d'algorithmes de suivi, « trackers », en développant des stratégies de fusion en ligne capables de les combiner génériquement. La chaîne de fusion proposée a consisté à sélectionner les trackers à partir d'indicateurs de bon fonctionnement, à combiner leurs sorties et à les corriger. La prédiction en ligne de dérive a été étudiée comme un élément clé du mécanisme de sélection. Plusieurs méthodes sont proposées pour chacune des étapes de la chaîne, donnant lieu à 46 configurations de fusion possibles. Évaluées sur 3 bases de données, l’étude a mis en évidence plusieurs résultats principaux : une sélection performante améliore considérablement la robustesse de suivi ; une correction de mise à jour est préférable à une réinitialisation ; il est plus avantageux de combiner un petit nombre de trackers complémentaires et de performances homogènes qu'un grand nombre ; la robustesse de fusion d’un petit nombre de trackers est corrélée à la mesure d’incomplétude, ce qui permet de sélectionner la combinaison de trackers adaptée à un contexte applicatif donnéVisual object tracking is an elementary function of computer vision that has been the subject of numerous studies. Drift over time is one of the most critical phenomena to master because it leads to the permanent loss of the target being tracked. Despite the numerous approaches proposed in the literature to counter this phenomenon, none outperforms another in terms of robustness to the various sources of visual perturbations: variation of illumination, occlusion, sudden movement of camera, change of aspect. The objective of this thesis is to exploit the complementarity of a set of tracking algorithms by developing on-line fusion strategies capable of combining them generically. The proposed fusion chain consists of selecting the trackers from indicators of good functioning, combining their outputs and correcting them. On-line drift prediction was studied as a key element of the selection mechanism. Several methods are proposed for each step of the chain, giving rise to 46 possible fusion configurations. Evaluated on 3 databases, the study highlighted several key findings: effective selection greatly improves robustness; The correction improves the robustness but is sensitive to bad selection, making updating preferable to reinitialization; It is more advantageous to combine a small number of complementary trackers with homogeneous performances than a large number; The robustness of fusion of a small number of trackers is correlated to the incompleteness measure, which makes it possible to select the appropriate combination of trackers to a given application context
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Khalid, ObaidUllah. "Performance evaluation for tracker-level fusion in video tracking". Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25901.
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Tracker-level fusion for video tracking combines outputs (state estimations) from multiple trackers, to address the shortcomings of individual trackers. Furthermore, performance evaluation of trackers at run time (online) can determine low performing trackers that can be removed from the fusion. This thesis presents a tracker-level fusion framework that performs online tracking performance evaluation for fusion. We first introduce a method to determine time instants of tracker failure that is divided into two steps. First, we evaluate tracking performance by comparing the distributions of the tracker state and a region around the state. We use Distribution Fields to generate the distributions of both regions and compute a tracking performance score by comparing the distributions using the L1 distance. Then, we model this score as a time series and employ the Auto Regressive Moving Average method to forecast future values of the performance score. A difference between the original and forecast returns the forecast error signal that we use to detect tracking failure. We test the method with different datasets and then demonstrate its flexibility using tracking results and sequences from the Visual Object Tracking (VOT) challenge. The second part presents a tracker-level fusion method that combines the outputs of multiple trackers. The method is divided into three steps. First, we group trackers into clusters based on the spatio-temporal pair-wise relationships of their outputs. Then, we evaluate tracking performance based on reverse-time analysis with an adaptive reference frame and define the cluster with trackers that appear to be successfully following the target as the on-target cluster. Finally, we fuse the outputs of the trackers in the on-target cluster to obtain the final target state. The fusion approach uses standard tracker outputs and can therefore combine various types of trackers. We test the method with several combinations of state-of-the-art trackers, and also compare it with individual trackers and other fusion approaches.
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Sik, Lingling. "GPU Ray Traced Rendering And Image Fusion Based Visualization Of Urban Terrain For Enhanced Situation Awareness". Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6020.
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Urban activities involving planning, preparing for and responding to time critical situations often demands sound situational awareness of overall settings. Decision makers, who are tasked to respond effectively to emergencies, must be equipped with information on the details of what is happening, and must stay informed with updates as the event unfolds and remain attentive to the extent of impact the dynamics of the surrounding settings might have. Recent increases in the volumes of geo-spatial data such as satellite imageries, elevation maps, street-level photographs and real-time imageries from remote sensory devices affect the way decision makers make assessments in time-critical situations. When terrain related spatial information are presented accurately, timely, and are augmented with terrain analysis such as viewshed computations, enhanced situational understanding could be formed. Painting such enhanced situational pictures, however, demands efficient techniques to process and present volumes of geo-spatial data. Modern Graphics Processing Units (GPUs) have opened up a wide field of applications far beyond processing millions of polygons. This dissertation presents approaches that harness graphics rendering techniques and GPU programmability to visualize urban terrain with accuracy, viewshed analysis and real-time imageries. The GPU ray tracing and image fusion visualization techniques presented herein have the potential to aid in achieving enhanced urban situational awareness and understanding.
Current state of the art polygon based terrain representations often use coarse representations for terrain features of less importance to improve rendering rate. This results in reduced geometrical accuracy for selective terrain features that are considered less critical to the visualization or simulation needs. Alternatively, to render highly accurate urban terrain, considerable computational effort is needed. A compromise between achieving real-time rendering rate and accurate terrain representations would have to be made. Likewise, computational tasks involved in terrain-related calculations such as viewshed analysis are highly computational intensive and are traditionally performed at a non-interactive rate. The first contribution of the research involves using GPU ray tracing, a rendering approach, conventionally not employed in the simulation community in favor of rasterization, to achieve accurate visualization and improved understanding of urban terrain. The efficiency of using GPU ray tracing is demonstrated in two areas, namely, in depicting complex, large scale terrain and in visualizing viewshed terrain effects at interactive rate.
Another contribution entails designing a novel approach to create an efficient and real-time mapping system. The solution achieves updating and visualizing terrain textures using 2D geo-referenced imageries for enhanced situational awareness. Fusing myriad of multi-view 2D inputs spatially for a complex 3D urban scene typically involves a large number of computationally demanding tasks such as image registrations, mosaickings and texture mapping. Current state of the art solutions essentially belongs to two groups. Each strives to either provide near real-time situational pictures in 2D or off-line complex 3D reconstructions for subsequent usages. The solution proposed in this research relies on using prior constructed synthetic terrains as backdrops to be updated with real-time geo-referenced images. The solution achieves speed in fusing information in 3D. Mapping geo-referenced images spatially in 3D puts them into context. It aids in conveying spatial relationships among the data. Prototypes to evaluate the effectiveness of the aforementioned techniques are also implemented. The benefits of augmenting situational displays with viewshed analysis and real-time geo-referenced images in relation to enhancing the user's situational awareness are also evaluated. Preliminary results from user evaluation studies demonstrate the usefulness of the techniques in enhancing operators' performances, in relation to situational awareness and understanding.Ph.D.
Doctorate
Industrial Engineering and Management Systems
Engineering and Computer Science
Modeling and Simulation
Libros sobre el tema "Fusion de traces"
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author, Sheringham Olivia 1981, ed. Encountering difference: Diasporic traces, creolizing spaces. Cambridge, UK: Polity Press, 2016.
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F, Deyev German, ed. Surface phenomena in fusion welding processes. Boca Raton, FL: Taylor & Francis, 2005.
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Dziuba, Mark. Stand Alone Tracks: Fusion. Alfred Publishing, 2006.
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Fourati, Hassen. Multisensor Data Fusion. Taylor & Francis Group, 2020.
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Borzu, Sabahi. 2 A Concise History of the Law of State Responsibility and Reparation in International Law. Oxford University Press, 2011. http://dx.doi.org/10.1093/acprof:oso/9780199601189.003.0002.
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The modern doctrines of State responsibility and reparation are the result of more than 2,000 years of human thought. This chapter traces the history of some of the most important components of State responsibility and reparation. The origins of these concepts are found in the historical roots of the civil law doctrines of extra-contractual liability and the remedy of restitutio in integrum, from Roman times until their entry into European civil codes. It explains how the private law notions discussed entered into international law and how, from the fusion of these notions and concepts with those supplied through the evolving doctrines of reprisals, denial of justice, and diplomatic protection, the modern doctrines of State responsibility and reparation were born.
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Gioia, Ted. The History of Jazz. 3a ed. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190087210.001.0001.
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The History of Jazz, 3rd edition, is a comprehensive survey of jazz music from its origins until the current day. The book is designed for general readers and students, as well as those with more specialized interest in jazz and music history. It provides detailed biographical information and an overview of the musical contributions of the key innovators in development of jazz, including Louis Armstrong, Duke Ellington, Billie Holiday, Coleman Hawkins, Charlie Parker, Dizzy Gillespie, Thelonious Monk, Ella Fitzgerald, Miles Davis, John Coltrane, Ornette Coleman, and others. The book also traces the evolution of jazz styles and includes in-depth accounts of ragtime, blues, New Orleans jazz, Chicago jazz, swing and big band music, bebop, hard bop, cool jazz, avant-garde, jazz-rock fusion, and other subgenres and developments. The volume also provides a cultural and socioeconomic contextualization of the music, dealing with the broader political and social environment that gave birth to the music and shaped its development—both in the United States and within a global setting.
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Raol, Jitendra R. Data Fusion Mathematics: Theory and Practice. Taylor & Francis Group, 2015.
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Raol, Jitendra R. Data Fusion Mathematics: Theory and Practice. Taylor & Francis Group, 2015.
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Data Fusion Mathematics: Theory and Practice. Taylor & Francis Group, 2015.
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Multisensor Data Fusion: From Algorithm and Architecture Design to Applications. Taylor & Francis Group, 2015.
Buscar texto completoCapítulos de libros sobre el tema "Fusion de traces"
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Yue, Yufeng y Danwei Wang. "Point Registration Approach for Map Fusion". En Springer Tracts in Autonomous Systems, 29–45. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8860-0_3.
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Yue, Yufeng y Danwei Wang. "Hierarchical Map Fusion Framework with Homogeneous Sensors". En Springer Tracts in Autonomous Systems, 47–75. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8860-0_4.
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Harrison, Alastair y Paul Newman. "Image and Sparse Laser Fusion for Dense Scene Reconstruction". En Springer Tracts in Advanced Robotics, 219–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13408-1_20.
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Gerardo-Castro, Marcos P., Thierry Peynot y Fabio Ramos. "Laser-Radar Data Fusion with Gaussian Process Implicit Surfaces". En Springer Tracts in Advanced Robotics, 289–302. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-07488-7_20.
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Sünderhauf, Niko. "An Outlook on Robust Optimization for Sensor Fusion and Calibration". En Springer Tracts in Advanced Robotics, 167–70. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-24017-1_9.
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Wong, Uland, Ben Garney, Warren Whittaker y Red Whittaker. "Camera and LIDAR Fusion for Mapping of Actively Illuminated Subterranean Voids". En Springer Tracts in Advanced Robotics, 421–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13408-1_38.
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Abeywardena, Dinuka y Gamini Dissanayake. "Tightly-Coupled Model Aided Visual-Inertial Fusion for Quadrotor Micro Air Vehicles". En Springer Tracts in Advanced Robotics, 153–66. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-07488-7_11.
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Soriguera Martí, Francesc. "Highway Travel Time Information Systems: A Review". En Highway Travel Time Estimation With Data Fusion, 1–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48858-4_1.
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Soriguera Martí, Francesc. "Travel Time Definitions". En Highway Travel Time Estimation With Data Fusion, 43–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48858-4_2.
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Soriguera Martí, Francesc. "Accuracy of Travel Time Estimation Methods Based on Punctual Speed Interpolations". En Highway Travel Time Estimation With Data Fusion, 53–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48858-4_3.
Texto completoActas de conferencias sobre el tema "Fusion de traces"
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Merkel, Ronny, Stefan Gruhn, Jana Dittmann, Claus Vielhauer y Anja Bräutigam. "General fusion approaches for the age determination of latent fingerprint traces: results for 2D and 3D binary pixel feature fusion". En IS&T/SPIE Electronic Imaging, editado por Atilla M. Baskurt y Robert Sitnik. SPIE, 2012. http://dx.doi.org/10.1117/12.908637.
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Yin, Yifang, An Tran, Ying Zhang, Wenmiao Hu, Guanfeng Wang, Jagannadan Varadarajan, Roger Zimmermann y See-Kiong Ng. "Multimodal Fusion of Satellite Images and Crowdsourced GPS Traces for Robust Road Attribute Detection". En SIGSPATIAL '21: 29th International Conference on Advances in Geographic Information Systems. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3474717.3483917.
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Chitikeshi, Sanjeevi, Ajay Mahajan, Tsuchin Chu y Jarlen Don. "A Fuzzy Logic Based Decision Making System for Fusing Measurements From an E-Puffer and E-Sniffer Sensing Systems for Detecting Explosives". En ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42922.
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This is primarily a concept paper and describes a decision making system that fuses the output from cold plasma based E-Puffer and E-Sniffer sensing systems to reliably detect explosive traces. This paper describes research and development of a novel non-contact method to detect explosive bearing personnel, baggage and vehicles that is based on the integration of a multitude of key technologies, primarily cold/atmospheric plasma and pattern recognition/decision making capabilities. This work will ultimately lead to a viable system that can be installed in doorways of buildings, garages, baggage carousals, etc. that will trigger a positive response when detecting explosive traces on personnel, bags or vehicles going thru a doorway. This paper describes the basic product concept and provides preliminary results of the fusion process from a simulated data set of output measurements from the two orthogonal measurement systems.
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Parrish, N., H. Anderson y M. R. Gupta. "Robust sequential classification of tracks". En 2010 13th International Conference on Information Fusion (FUSION 2010). IEEE, 2010. http://dx.doi.org/10.1109/icif.2010.5711978.
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Ogle, Terrence L., Ben P. Davis, W. Dale Blair y Peter K. Willett. "Correlation of Gaussian Mixture Tracks". En 2018 21st International Conference on Information Fusion (FUSION 2018). IEEE, 2018. http://dx.doi.org/10.23919/icif.2018.8455572.
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Balci, Ali Emre, Kurtulus Kerem Sahin, Firat Kumru, Fatih Pektas, Emre Ozkan y Umut Orguner. "Association and Fusion of Range- Azimuth Tracks". En 2022 25th International Conference on Information Fusion (FUSION). IEEE, 2022. http://dx.doi.org/10.23919/fusion49751.2022.9841272.
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Miceli, P. A., W. Dale Blair y M. M. Brown. "Isolating Random and Bias Covariances in Tracks". En 2018 21st International Conference on Information Fusion (FUSION 2018). IEEE, 2018. http://dx.doi.org/10.23919/icif.2018.8455530.
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Roth, Michael, Benjamin Baasch, Patrik Havrila y Jorn Groos. "Map-Supported Positioning Enables In-Service Condition Monitoring of Railway Tracks". En 2018 International Conference on Information Fusion (FUSION). IEEE, 2018. http://dx.doi.org/10.23919/icif.2018.8455377.
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Reuter, S. y K. Dietmayer. "Adapting the state uncertainties of tracks to environmental constraints". En 2010 13th International Conference on Information Fusion (FUSION 2010). IEEE, 2010. http://dx.doi.org/10.1109/icif.2010.5711832.
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Saha, Rajat K., Kuo-Chu Chang y Mieczyslaw M. Kokar. "Fusion of synchronous tracks". En AeroSense '97, editado por Ivan Kadar. SPIE, 1997. http://dx.doi.org/10.1117/12.280799.
Texto completoInformes sobre el tema "Fusion de traces"
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Le, Qiang. Low Complexity Track Initialization and Fusion for Multi-Modal Sensor Networks. Fort Belvoir, VA: Defense Technical Information Center, noviembre de 2012. http://dx.doi.org/10.21236/ada569636.
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Jeun, Buddy H. y Jay Jayaraman. A Multi-Sensor Fusion Track Solution to Address the Multi-Target Problem. Fort Belvoir, VA: Defense Technical Information Center, enero de 1999. http://dx.doi.org/10.21236/ada385413.
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Hovakimyan, Naira, Hunmin Kim, Wenbin Wan y Chuyuan Tao. Safe Operation of Connected Vehicles in Complex and Unforeseen Environments. Illinois Center for Transportation, agosto de 2022. http://dx.doi.org/10.36501/0197-9191/22-016.
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Autonomous vehicles (AVs) have a great potential to transform the way we live and work, significantly reducing traffic accidents and harmful emissions on the one hand and enhancing travel efficiency and fuel economy on the other. Nevertheless, the safe and efficient control of AVs is still challenging because AVs operate in dynamic environments with unforeseen challenges. This project aimed to advance the state-of-the-art by designing a proactive/reactive adaptation and learning architecture for connected vehicles, unifying techniques in spatiotemporal data fusion, machine learning, and robust adaptive control. By leveraging data shared over a cloud network available to all entities, vehicles proactively adapted to new environments on the proactive level, thus coping with large-scale environmental changes. On the reactive level, control-barrier-function-based robust adaptive control with machine learning improved the performance around nominal models, providing performance and control certificates. The proposed research shaped a robust foundation for autonomous driving on cloud-connected highways of the future.
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Knight, R. D. y B. A. Kjarsgaard. Comparative pXRF and Lab ICP-ES/MS methods for mineral resource assessment, Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331239.
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The Geological Survey of Canada undertook a mineral resource assessment for a proposed national park in northern Canada (~ 33,500 km2) spanning the transition from boreal forest to barren lands tundra. Bedrock geology of this region is complex and includes the Archean Slave Craton, the Archean and Paleoproterozoic Rae domain of the Churchill Province, the Paleoproterozoic Thelon and Taltson magmatic-tectonic zones, and the Paleoproterozoic East Arm sedimentary basin. The area has variable mineral potential for lode gold, kimberlite-hosted diamonds, VMS, vein uranium and copper, SEDEX, as well as other deposit types. A comparison of analytical methods was carried out after processing the field collected samples to acquire both the &lt; 2 mm and for the &lt; 0.063 mm size fractions for 241 surficial sediment (till) samples, collected using a 10 x 10 km grid. Analytical methods comprised: 1) aqua regia followed by ICP-MS analysis, 2) 4-acid hot dissolution followed by ICP-ES/MS analysis, 3) lithium metaborate/tetraborate fusion methods followed by ICP-ES for major elements and ICP-MS for trace elements and, 4) portable XRF on dried, non-sieved sediment samples subjected to a granular segregation processing technique (to produce a clay-silt proxy) for seventeen elements (Ba, Ca, Cr, Cu, Fe, K, Mn, Ni, Pb, Rb, Sr, Th, Ti, U, V, Zn, and Zr) Results indicate that pXRF data do not replicate exactly the laboratory 4-acid and fusion data (in terms of precision and accuracy), but the relationship between the datasets is systematic as displayed in x-y scattergrams. Interpolated single element plots indicate that till samples with anomalies of high and low pXRF concentration levels are synonymous with high and low laboratory-based analytical concentration levels, respectively. The pXRF interpolations thus illustrate the regional geochemical trends, and most importantly, the significant geochemical anomalies in the surficial samples. These results indicate that pXRF spectrometry for a subset of elements is comparable to traditional laboratory methods. pXRF spectrometry also provides the benefit of rapid analysis and data acquisition that has a direct influence on real time sampling designs. This information facilitates efficient and cost-effective field projects (i.e. where used to identify regions of interest for high density sampling), and to prioritize samples to be analyzed using traditional geochemical methods. These tactics should increase the efficiency and success of a mineral exploration and/or environmental sampling programs.
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Pérez López, Julio, ed. Instituto de Investigaciones Filológicas. Departamento de Sistemas del Instituto de Investigaciones Filológicas, julio de 2011. http://dx.doi.org/10.19130/inif.
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El Instituto de Investigaciones Filológicas tiene como propósito conservar, revalorar y acrecentar el cultivo de las Humanidades en la UNAM y en el país, mediante el desarrollo de investigación especializada de alto nivel sobre las lenguas y las culturas clásicas (griega y latina), hispánica e indígena, cuya fusión constituye la esencia de la cultura mexicana, todo ello desde una perspectiva filológica en sentido amplio. Asimismo, incluye entre sus objetivos el estudio de otras tradiciones como la hebrea, la árabe y la sánscrita, además de la hermenéutica, la teoría y crítica literarias y la edición crítica de textos. La generación de nuevo conocimiento vinculada a través de la filología, sirve de base para impartir docencia en los distintos niveles de estudio, y para la difusión y la extensión de la cultura. Guarda una visión de largo alcance encaminada a consolidar los distintos Centros y Seminarios del Instituto, así como reforzar su unidad, haciendo hincapié en elementos comunes que propicien la vinculación, al tiempo que se estimulan también las perspectivas multi e interdisciplinarias que faciliten la interacción de las diversas entidades académicas y enriquezcan la singularidad del Instituto que, en no pocos sentidos, reposa en su diversidad. La constante búsqueda de nuevos progresos en el saber humanístico, la formación de investigadores y la consolidación y enriquecimiento de la vida colegiada, y su traducción aplicada a los campos de la docencia y la difusión científica, son tareas esenciales en la visión del Instituto. Su objetivo es mantener, revalorar y acrecentar el cultivo de las Humanidades en la Universidad Nacional Autónoma de México, desde las perspectivas filológicas de las lenguas, las literaturas y las culturas clásicas, hispánicas e indoamericanas, estudiadas y comprendidas con el rigor metodológico correspondiente. Asimismo, contribuir a la solución de los problemas nacionales en el campo de la cultura humanística, a través de la filología, y proyectar sus conocimientos tanto a nivel nacional como en otros países.
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Stubrin, Lilia, Anabel Marín, Enrique Carreras, Rocío Palacín y Lucía Mauro. Caso de estudio Don Mario: una empresa Argentina que gana el mercado global de semilla de soja. Inter-American Development Bank, marzo de 2023. http://dx.doi.org/10.18235/0004765.
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El grupo Don Mario (GDM) es una empresa que desarrolla semillas de Argentina que se ha convertido en un jugador importante en el mercado global proveyendo el 20% de las variedades de soja que se utilizan en el mundo. La empresa exporta actualmente a más de 11 países. El crecimiento e internacionalización del grupo Don Mario es un fenómeno de enorme interés ya que se produjo en un período en el que el mercado global de semillas se concentró masivamente en unas pocas empresas internacionales a través de un proceso de fusiones y adquisiciones sin precedentes, que involucró la desaparición de cientos de empresas semilleras independientes. En este reporte discutimos los principales cambios en la demanda mundial, tecnológicos, regulatorios y de estructura de mercado que han operado y operan como oportunidades y desafíos para la expansión de Don Mario; presentaremos una serie de indicadores que describen el contexto global y local en el cual opera la empresa Don Mario; analizamos en detalle el alcance y modelo de la inserción internacional de la empresa Don Mario; explicaremos los elementos claves que explican el éxito de la firma; el uso e impacto de las políticas públicas; y los desafíos pendientes que tiene la empresa para continuar su proceso de crecimiento internacional.
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Izhar, Shamay, Maureen Hanson y Nurit Firon. Expression of the Mitochondrial Locus Associated with Cytoplasmic Male Sterility in Petunia. United States Department of Agriculture, febrero de 1996. http://dx.doi.org/10.32747/1996.7604933.bard.
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The main goal of the proposed research was to continue the mutual investigations into the molecular basis of CMS and male fertility restoration [MRF], with the ultimate goal of understanding these phenomena in higher plants. The experiments focused on: (1) dissecting apart the complex CMS - specific mitochondrial S-Pcf locus, in order to distinguish its essential parts which cause sterility from other parts and study its molecular evolution. (2) Studying the expression of the various regions of the S-Pcf locus in fertile and sterile lines and comparing the structure and ultrastructure of sterile and fertile tissues. (3) Determine whether alteration in respiration is genetically associated with CMS. Our mutual investigations further substantiated the association between the S-Pcf locus and CMS by the findings that the fertile phenotype of a population of unstable petunia somatic hybrids which contain the S-Pcf locus, is due to the presence of multiple muclear fertility restoration genes in this group of progenies. The information obtained by our studies indicate that homologous recombination played a major role in the molecular evolution of the S-Pcf locus and the CMS trait and in the generation of mitochondrial mutations in general. Our data suggest that the CMS cytoplasm evolved by introduction of a urs-s containing sublimon into the main mitochondrial genome via homologous recombination. We have also found that the first mutation detected so far in S-Pcf is a consequence of a homologous recombination mechanism involving part of the cox2 coding sequence. In all the cases studied by us, at the molecular level, we found that fusion of two different cells caused mitochondrial DNA recombination followed by sorting out of a specific mtDNA population or sequences. This sequence of events suggested as a mechanism for the generation of novel mitochondrial genomes and the creation of new traits. The present research also provides data concerning the expression of the recombined and complex CMS-specific S-Pcf locus as compared with the expression of additional mitochondrial proteins as well as comparative histological and ultrastructural studies of CMS and fertile Petunia. Evidence is provided for differential localization of mitochondrially encoded proteins in situ at the tissue level. The similar localization patterns of Pcf and atpA may indicate that Pcf product could interfere with the functioning of the mitochondrial ATPase in a tissue undergoing meiosis and microsporogenesis. Studies of respiration in CMS and fertile Petunia lines indicate that they differe in the partitioning of electron transport through the cytochrome oxidase and alternative oxidase pathways. The data indicate that the electron flux through the two oxidase pathways differs between mitochondria from fertile and sterile Petunia lines at certain redox states of the ubiquinone pool. In summary, extensive data concerning the CMS-specific S-Pcf locus of Petunia at the DNA and protein levels as well as information concerning different biochemical activity in CMS as compared to male fertile lines have been accumulated during the three years of this project. In addition, the involvement of the homologous recombination mechanism in the evolution of mt encoded traits is emphasized.
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Epel, Bernard L., Roger N. Beachy, A. Katz, G. Kotlinzky, M. Erlanger, A. Yahalom, M. Erlanger y J. Szecsi. Isolation and Characterization of Plasmodesmata Components by Association with Tobacco Mosaic Virus Movement Proteins Fused with the Green Fluorescent Protein from Aequorea victoria. United States Department of Agriculture, septiembre de 1999. http://dx.doi.org/10.32747/1999.7573996.bard.
Texto completoResumen
The coordination and regulation of growth and development in multicellular organisms is dependent, in part, on the controlled short and long-distance transport of signaling molecule: In plants, symplastic communication is provided by trans-wall co-axial membranous tunnels termed plasmodesmata (Pd). Plant viruses spread cell-to-cell by altering Pd. This movement scenario necessitates a targeting mechanism that delivers the virus to a Pd and a transport mechanism to move the virion or viral nucleic acid through the Pd channel. The identity of host proteins with which MP interacts, the mechanism of the targeting of the MP to the Pd and biochemical information on how Pd are alter are questions which have been dealt with during this BARD project. The research objectives of the two labs were to continue their biochemical, cellular and molecular studies of Pd composition and function by employing infectious modified clones of TMV in which MP is fused with GFP. We examined Pd composition, and studied the intra- and intercellular targeting mechanism of MP during the infection cycle. Most of the goals we set for ourselves were met. The Israeli PI and collaborators (Oparka et al., 1999) demonstrated that Pd permeability is under developmental control, that Pd in sink tissues indiscriminately traffic proteins of sizes of up to 50 kDa and that during the sink to source transition there is a substantial decrease in Pd permeability. It was shown that companion cells in source phloem tissue export proteins which traffic in phloem and which unload in sink tissue and move cell to cell. The TAU group employing MP:GFP as a fluorescence probe for optimized the procedure for Pd isolation. At least two proteins kinases found to be associated with Pd isolated from source leaves of N. benthamiana, one being a calcium dependent protein kinase. A number of proteins were microsequenced and identified. Polyclonal antibodies were generated against proteins in a purified Pd fraction. A T-7 phage display library was created and used to "biopan" for Pd genes using these antibodies. Selected isolates are being sequenced. The TAU group also examined whether the subcellular targeting of MP:GFP was dependent on processes that occurred only in the presence of the virus or whether targeting was a property indigenous to MP. Mutant non-functional movement proteins were also employed to study partial reactions. Subcellular targeting and movement were shown to be properties indigenous to MP and that these processes do not require other viral elements. The data also suggest post-translational modification of MP is required before the MP can move cell to cell. The USA group monitored the development of the infection and local movement of TMV in N. benthamiana, using viral constructs expressing GFP either fused to the MP of TMV or expressing GFP as a free protein. The fusion protein and/or the free GFP were expressed from either the movement protein subgenomic promoter or from the subgenomic promoter of the coat protein. Observations supported the hypothesis that expression from the cp sgp is regulated differently than expression from the mp sgp (Szecsi et al., 1999). Using immunocytochemistry and electron microscopy, it was determined that paired wall-appressed bodies behind the leading edge of the fluorescent ring induced by TMV-(mp)-MP:GFP contain MP:GFP and the viral replicase. These data suggest that viral spread may be a consequence of the replication process. Observation point out that expression of proteins from the mp sgp is temporary regulated, and degradation of the proteins occurs rapidly or more slowly, depending on protein stability. It is suggested that the MP contains an external degradation signal that contributes to rapid degradation of the protein even if expressed from the constitutive cp sgp. Experiments conducted to determine whether the degradation of GFP and MP:GFP was regulated at the protein or RNA level, indicated that regulation was at the protein level. RNA accumulation in infected protoplast was not always in correlation with protein accumulation, indicating that other mechanisms together with RNA production determine the final intensity and stability of the fluorescent proteins.
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Alfano, James, Isaac Barash, Thomas Clemente, Paul E. Staswick, Guido Sessa y Shulamit Manulis. Elucidating the Functions of Type III Effectors from Necrogenic and Tumorigenic Bacterial Pathogens. United States Department of Agriculture, enero de 2010. http://dx.doi.org/10.32747/2010.7592638.bard.
Texto completoResumen
Many phytopathogenic bacteria use a type III protein secretion system (T3SS) to inject type III effectors into plant cells. In the experiments supported by this one-year feasibility study we investigated type III effector function in plants by using two contrasting bacterial pathogens: Pseudomonas syringae pv. tomato, a necrotrophic pathogen and Pantoea agglomerans, a tumorigenic pathogen. The objectives are listed below along with our major conclusions, achievements, and implications for science and agriculture. Objective 1: Compare Pseudomonas syringae and Pantoea agglomerans type III effectors in established assays to test the extent that they can suppress innate immunity and incite tumorigenesis. We tested P. agglomerans type III effectors in several innate immunity suppression assays and in several instances these effectors were capable of suppressing plant immunity, outputs that are suppressed by P. syringae effectors. Interestingly, several P. syringae effectors were able to complement gall production to a P. agglomerans pthGmutant. These results suggest that even though the disease symptoms of these pathogens are dramatically different, their type III effectors may function similarly. Objective 2: Construct P. syringae mutants in different combinations of type III-related DNA clusters to reduce type III effector redundancy. To determine their involvement in pathogenicity we constructed mutants that lack individual and multiple type III-related DNA clusters using a Flprecombinase-mediated mutagenesis strategy. The majority of single effector mutants in DC3000 have weak pathogenicity phenotypes most likely due to functional redundancy of effectors. Supporting this idea, Poly-DNAcluster deletion mutants were more significantly reduced in their ability to cause disease. Because these mutants have less functional redundancy of type III effectors, they should help identify P. syringae and P. agglomerans effectors that contribute more significantly to virulence. Objective 3: Determine the extent that P. syringae and P. agglomerans type III effectors alter hormone levels in plants. Inhibition of auxin polar transport by 2,3,5-triiodobenzoic acid (TIBA) completely prevented gall formation by P. agglomerans pv. gypsophilae in gypsophila cuttings. This result supported the hypothesis that auxin and presumably cytokinins of plant origin, rather than the IAA and cytokinins secreted by the pathogen, are mandatory for gall formation. Transgenic tobacco with pthGshowed various phenotypic traits that suggest manipulation of auxin metabolism. Moreover, the auxin levels in pthGtransgenic tobacco lines was 2-4 times higher than the control plants. External addition of auxin or cytokinins could modify the gall size in gypsophila cuttings inoculated with pthGmutant (PagMx27), but not with other type III effectors. We are currently determining hormone levels in transgenic plants expressing different type III effectors. Objective 4: Determine whether the P. agglomerans effectors HsvG/B act as transcriptional activators in plants. The P. agglomerans type III effectors HsvG and HsvB localize to the nucleus of host and nonhost plants and act as transcription activators in yeast. Three sites of adjacent arginine and lysine in HsvG and HsvB were suspected to act as Nuclear localization signals (NLS) domains. A nuclear import assay indicated two of the three putative NLS domains were functional NLSs in yeast. These were shown to be active in plants by fusing HsvG and HsvB to YFP. localization to the nucleus was dependent on these NLS domains. These achievements indicate that our research plan is feasible and suggest that type III effectors suppress innate immunity and modulate plant hormones. This information has the potential to be exploited to improve disease resistance in agricultural crops.
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Granot, David, Richard Amasino y Avner Silber. Mutual effects of hexose phosphorylation enzymes and phosphorous on plant development. United States Department of Agriculture, enero de 2006. http://dx.doi.org/10.32747/2006.7587223.bard.
Texto completoResumen
Research objectives 1) Analyze the combined effects of hexose phosphorylation and P level in tomato and Arabidopsis plants 2) Analyze the combined effects of hexose phosphorylation and P level in pho1 and pho2 Arabidopsis mutants 3) Clone and analyze the PHO2 gene 4) Select Arabidopsis mutants resistant to high and low P 5) Analyze the Arabidopsis mutants and clone the corresponding genes 6) Survey wild tomato species for growth characteristics at various P levels Background to the topic Hexose phosphorylating enzymes, the first enzymes of sugar metabolism, regulate key processes in plants such as photosynthesis, growth, senescence and vascular transport. We have previously discovered that hexose phosphorylating enzymes might regulate these processes as a function of phosphorous (P) concentration, and might accelerate acquisition of P, one of the most limiting nutrients in the soil. These discoveries have opened new avenues to gain fundamental knowledge about the relationship between P, sugar phosphorylation and plant development. Since both hexose phosphorylating enzymes and P levels affect plant development, their interaction is of major importance for agriculture. Due to the acceleration of senescence caused by the combined effects of hexose phosphorylation and P concentration, traits affecting P uptake may have been lost in the course of cultivation in which fertilization with relatively high P (30 mg/L) are commonly used. We therefore intended to survey wild tomato species for high P-acquisition at low P soil levels. Genetic resources with high P-acquisition will serve not only to generate a segregating population to map the trait and clone the gene, but will also provide a means to follow the trait in classical breeding programs. This approach could potentially be applicable for other crops as well. Major conclusions, solutions, achievements Our results confirm the mutual effect of hexose phosphorylating enzymes and P level on plant development. Two major aspects of this mutual effect arose. One is related to P toxicity in which HXK seems to play a major role, and the second is related to the effect of HXK on P concentration in the plant. Using tomato plants we demonstrated that high HXK activity increased leaf P concentration, and induced P toxicity when leaf P concentration increases above a certain high level. These results further support our prediction that the desired trait of high-P acquisition might have been lost in the course of cultivation and might exist in wild species. Indeed, in a survey of wild species we identified tomato species that acquired P and performed better at low P (in the irrigation water) compared to the cultivated Lycopersicon esculentum species. The connection between hexose phosphorylation and P toxicity has also been shown with the P sensitive species VerticordiaplumosaL . in which P toxicity is manifested by accelerated senescence (Silber et al., 2003). In a previous work we uncovered the phenomenon of sugar induced cell death (SICD) in yeast cells. Subsequently we showed that SICD is dependent on the rate of hexose phosphorylation as determined by Arabidopsis thaliana hexokinase. In this study we have shown that hexokinase dependent SICD has many characteristics of programmed cell death (PCD) (Granot et al., 2003). High hexokinase activity accelerates senescence (a PCD process) of tomato plants, which is further enhanced by high P. Hence, hexokinase mediated PCD might be a general phenomena. Botrytis cinerea is a non-specific, necrotrophic pathogen that attacks many plant species, including tomato. Senescing leaves are particularly susceptible to B. cinerea infection and delaying leaf senescence might reduce this susceptibility. It has been suggested that B. cinerea’s mode of action may be based on induction of precocious senescence. Using tomato plants developed in the course of the preceding BARD grant (IS 2894-97) and characterized throughout this research (Swartzberg et al., 2006), we have shown that B. cinerea indeed induces senescence and is inhibited by autoregulated production of cytokinin (Swartzberg et al., submitted). To further determine how hexokinase mediates sugar effects we have analyzed tomato plants that express Arabidopsis HXK1 (AtHXK1) grown at different P levels in the irrigation water. We found that Arabidopsis hexokinase mediates sugar signalling in tomato plants independently of hexose phosphate (Kandel-Kfir et al., submitted). To study which hexokinase is involved in sugar sensing we searched and identified two additional HXK genes in tomato plants (Kandel-Kfir et al., 2006). Tomato plants have two different hexose phosphorylating enzymes; hexokinases (HXKs) that can phosphorylate either glucose or fructose, and fructokinases (FRKs) that specifically phosphorylate fructose. To complete the search for genes encoding hexose phosphorylating enzymes we identified a forth fructokinase gene (FRK) (German et al., 2004). The intracellular localization of the four tomato HXK and four FRK enzymes has been determined using GFP fusion analysis in tobacco protoplasts (Kandel-Kfir et al., 2006; Hilla-Weissler et al., 2006). One of the HXK isozymes and one of the FRK isozymes are located within plastids. The other three HXK isozymes are associated with the mitochondria while the other three FRK isozymes are dispersed in the cytosol. We concluded that HXK and FRK are spatially separated in plant cytoplasm and accordingly might play different metabolic and perhaps signalling roles. We have started to analyze the role of the various HXK and FRK genes in plant development. So far we found that LeFRK2 is required for xylem development (German et al., 2003). Irrigation with different P levels had no effect on the phenotype of LeFRK2 antisense plants. In the course of this research we developed a rapid method for the analysis of zygosity in transgenic plants (German et al., 2003).