Literatura académica sobre el tema "Essaim de bulles"
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Artículos de revistas sobre el tema "Essaim de bulles"
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El Malki Alaoui, Aboulghit, Mehdi El Himer, Nicolas Jacques y Celine Gabillet. "Effet de l'aération lors d'impacts hydrodynamiques : essais et simulations". La Houille Blanche, n.º 5-6 (diciembre de 2019): 74–80. http://dx.doi.org/10.1051/lhb/2019031.
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Dans cette étude, nous présentons les résultats d'une campagne d'essais d'impacts hydrodynamiques réalisés grâce à la machine de choc de l'ENSTA Bretagne, en intégrant un dispositif permettant de générer des bulles de manière contrôlée dans le bassin. Préalablement à ces essais, les taux de vide générés par l'aérateur ont été caractérisés en fonction du débit d'air injecté à l'aide d'une sonde optique. Au cours de ces essais, le débit d'air injecté a été varié pour obtenir des taux de vide moyens α0 compris entre 0,35 et 1,1 %. Les résultats mettent en évidence une réduction sensible de la force d'impact avec l'augmentation du taux de vide.
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CHEMTOB, M., R. DOLLO, C. COQUEMA, J. CHARY y C. GINISTY. "Essais de dosimètres neutrons à bulles, modèle BD 100 R-PND et modèle BDT". Radioprotection 30, n.º 1 (enero de 1995): 61–78. http://dx.doi.org/10.1051/radiopro/1995023.
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Ottavi, Dominique. "Bulle Nathalie. L’école et son double. Essai sur l’évolution pédagogique en France". Revue française de pédagogie, n.º 169 (1 de octubre de 2009): 141–43. http://dx.doi.org/10.4000/rfp.1636.
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Amiel, Christophe, Sylvie Gillot, Michel Roustan y Alain Héduit. "Vers une méthode de mesure du transfert d'oxygène en biofiltres". Water Quality Research Journal 37, n.º 4 (1 de noviembre de 2002): 729–43. http://dx.doi.org/10.2166/wqrj.2002.049.
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Abstract L'objectif du travail présenté était d'une part de préciser les conditions d'adaptation aux biofiltres des méthodes de mesure “usuelles” en eau claire du transfert d'oxygène, d'autre part, de déterminer si l'addition de cobalt pouvait être évitée pour ralentir l'oxydation du sulfite. Trois méthodes de mesure ont été mises en oeuvre en eau claire et comparées sur colonne à bulles et en pilote biofiltre : la méthode de réoxygénation, la méthode des bilans gazeux et la méthode du dosage du sulfite. Les essais réalisés à différents débits d'air en présence d'une forte concentration en sulfite de sodium (2000 mg.L-1) ont montré que l'ajout de cobalt induisait un important facteur d'accélération du transfert d'oxygène. En milieu diphasique, la méthode des bilans gazeux (sans ou avec cobalt) fournit des résultats comparables à la méthode de référence (réoxygénation avec cobalt). Dans les conditions expérimentales, la méthode du dosage de sulfite fournie des résultats sous estimés. En pilote biofiltre, la méthode la mieux adaptée pour l'estimation du rendement d'oxygénation global en eau claire est la méthode des bilans gazeux sans addition de cobalt.
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Krause-Jensen, Jakob. "Seven birds with one magic bullet: designing assignments that encourage student participation". Learning and Teaching 3, n.º 1 (1 de marzo de 2010): 51–68. http://dx.doi.org/10.3167/latiss.2010.030104.
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At the Danish University School of Education we have experimented with a form of assessment called 'active participation'. A week before each class students are given reading guidelines and questions to help them approach the texts, and on the basis of one of those questions the students each write a two-page essay. The students are given electronic feedback on their essays (and might have to revise and resubmit them if they do not meet requirements). Among other things, the advantages of this type of examination are: that the students practise academic writing on a regular basis; that feedback becomes an integral part of teaching; that the students must read steadily over the whole semester; and that they are encouraged to take part in all the classes.
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Message, Kylie, Eleanor Foster, Joanna Cobley, Shih Chang, John Reeve, Grace Gassin, Nadia Gush, Esther McNaughton, Ira Jacknis y Siobhan Campbell. "Book Review Essays and Reviews". Museum Worlds 7, n.º 1 (1 de julio de 2019): 292–317. http://dx.doi.org/10.3167/armw.2019.070117.
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Book Review EssaysMuseum Activism. Robert R. Janes and Richard Sandell, eds. New York: Routledge, 2019.New Conversations about Safeguarding the Future: A Review of Four Books. - A Future in Ruins: UNESCO, World Heritage, and the Dream of Peace. Lynn Meskell. New York: Oxford University Press, 2018. - Keeping Their Marbles: How the Treasures of the Past Ended Up in Museums—And Why They Should Stay There. Tiffany Jenkins. Oxford: Oxford University Press, 2016. - World Heritage and Sustainable Development: New Directions in World Heritage Management. Peter Bille Larsen and William Logan, eds. New York: Routledge, 2018. - Safeguarding Intangible Heritage: Practices and Politics. Natsuko Akagawa and Laurajane Smith, eds. New York: Routledge, 2019. Book ReviewsThe Filipino Primitive: Accumulation and Resistance in the American Museum. Sarita Echavez See. New York: New York University Press, 2017.The Art of Being a World Culture Museum: Futures and Lifeways of Ethnographic Museums in Contemporary Europe. Barbara Plankensteiner, ed. Berlin: Kerber Verlag, 2018.China in Australasia: Cultural Diplomacy and Chinese Arts since the Cold War. James Beattie, Richard Bullen, and Maria Galikowski. London: Routledge, 2019.Women and Museums, 1850–1914: Modernity and the Gendering of Knowledge. Kate Hill. Manchester: Manchester University Press, 2016.Rethinking Research in the Art Museum. Emily Pringle. New York: Routledge, 2019.A Natural History of Beer. Rob DeSalle and Ian Tattersall. New Haven, CT: Yale University Press, 2019.Fabricating Power with Balinese Textiles: An Anthropological Evaluation of Balinese Textiles in the Mead-Bateson Collection. Urmila Mohan. Chicago: University of Chicago Press, 2018.
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Charmot, M. L., N. Roche y C. Prost. "Influence d'une alimentation séquentielle sur l'épuration par boues activées d'un effluent fortement chargé". Revue des sciences de l'eau 10, n.º 3 (12 de abril de 2005): 377–94. http://dx.doi.org/10.7202/705285ar.
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Cet article présente les résultats d'une étude menée sur le traitement d'effluents fortement chargés (DCO > 1,5 kg.m-3) par un procédé à boues activées. L'objectif principal de ce travail est de montrer qu'une alimentation séquentielle d'un réacteur parfaitement agité avec maintien permanent du recyclage des boues et de l'oxygénation permet d'obtenir une bonne épuration tant du point de vue de l'élimination de la pollution carbonée que de la maîtrise de la décantabilité des flocs microbiens. Les essais sont menés sur un pilote de laboratoire constitué d'une colonne à bulles et d'un décanteur, alimenté avec un substrat synthétique. Contrairement à une alimentation continue, la mise en place de cycles d'alimentation permet d'obtenir des flocs de bonne décantabilité de manière constante dans le temps. Ainsi une concentration élevée en biomasse peut être maintenue dans le réacteur. De plus, le suivi d'un cycle 1 h/1 h confirme que la mise en œuvre d'un cycle court n'entraîne pas de variations importantes des performances d'épuration. Par ailleurs, le suivi d'un long cycle (24 h/24 h) montre des variations significatives des concentrations en DCO, polysaccharides dans la phase liquide et exopolysaccharides dans les flocs microbiens. Ceci semble indiquer que des produits microbiens sont relargués des flocs vers la phase liquide pendant l'arrêt de l'alimentation et que des exopolysaccharides sont produits dans les flocs pendant l'alimentation.
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Biron, Michel. "Happy end : l’héritage amérindien dans Rouge, mère et fils de Suzanne Jacob". Tangence, n.º 98 (26 de septiembre de 2012): 87–99. http://dx.doi.org/10.7202/1012489ar.
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Le refus de l’héritage amérindien fait partie des « fictions dominantes » dénoncées par Suzanne Jacob dans son essai La bulle d’encre. Elle en fait le thème central de son roman Rouge, mère et fils (2001) dont cet article analyse la composition (autour de la couleur rouge) et les principaux personnages : la mère Delphine, le fils Luc, le père Félix de même qu’un personnage extravagant, appelé le Trickster, par qui la mère et le fils retrouveront en fin de roman le fil de leur histoire, irriguée par le sang amérindien qui coule dans leurs veines. L’article met l’accent sur le changement de registre qui apparaît dans le dernier chapitre du roman, lequel délaisse le ton ironique employé jusque-là au profit d’une prose poétique et solennelle. En s’emparant d’un héritage détourné (celui du métissage amérindien refoulé par le discours identitaire québécois), le roman se voit lui-même détourné par cet héritage, au nom d’une demande de sens venue de l’extérieur du roman.
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Peramaki, Ed R. "Pictorial Review of Radiographic Patterns of Injury in Modern Warfare: Imaging the Conflict in Afghanistan". Canadian Association of Radiologists Journal 62, n.º 2 (mayo de 2011): 90–106. http://dx.doi.org/10.1016/j.carj.2010.03.005.
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Radiographic assessment of combat injuries has been an important component of casualty care in every major conflict of the 20th and 21st centuries. The advent of multislice computed tomography scanners has provided physicians with the ability to visualize organ injury at submillimetre resolution, changing the way war wounds are treated. Modern wars are, for the most part, asymmetric conflicts where improvised explosive devices have replaced artillery as a major cause of casualties. Both bullets and explosive devices wreak distinctive patterns of injury on the human body. Being able to recognize these patterns and their potential associated morbidities will allow medical personnel to provide expert and timely care to some of the most severely injured patients on earth. This series of pictorial essays will review the radiographic patterns of combat-related injury encountered in southern Afghanistan in 2008–2009.
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Traore, S., S. Ouedraogo-Kone, A. Samake, M. D. Traore y K. Bengaly. "Effet de l’association entre le tourteau de coton et les gousses de Piliostigma reticulatum (dc) Hochst sur l’ingestion et la digestibilité de la paille de riz". International Journal of Biological and Chemical Sciences 16, n.º 3 (27 de agosto de 2022): 1071–83. http://dx.doi.org/10.4314/ijbcs.v16i3.14.
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L’effet associatif entre les constituants d’une ration peut induire un effet positif ou negative sur les performances de production des ruminants,en function de la nature des constituants de la ration. De plus, La prediction de la valeur alimentaire de la ration sur la base de la somme des valeurs des constituants comporte beaucoup de limites. Deux essais ont été conduits pour évaluer l’effet associatif entre du tourteau de graine de coton non décortiquée (TBM) et les gousses de Piliostigma reticulatum (GP) sur l’ingestion volontaire (essai 1) et la fermentation in vitro à l’aide de la technique du gaz test (essai 2) de la paille de riz seule (PS) ou avec la mélasse et l’urée (PMU). Le TBM a été ajouté à PS ou à PMU dans la proportion: 70 / 30 (PS/TBM ou PMU / TBM). Les GP ont été ensuite substituées au TBM dans la proportion de 15%. Quatre rations ont été formulées pour l’essai 1: R1 (70% PS + 30% TBM), R2 (70% PMU + 30% TBM), R3 (70% PMU + 15% TBM + 15% GP) et R4 = R3 mais TBM et GP ont été distribués de façon séquentielle. Deux autres rations: 100% PS et 100% PMU en plus des rations précédentes, ont servi de substrats pour le gaz test. La ration R2 comparée à R1 a significativement (p < 0.05) amélioré les performances de croissance des taurillons. Par contre, l’apport de GP n’a pas eu d’effet car les GP n’ont pas été consommées tout au long de l’essai. Contrairement aux traitements PS et TBM (essai 2), les traitements PMU et TBM ont engendré une augmentation significative (p < 0.05) du taux horaire (c) de fermentation de la fraction insoluble (b), la concentration des acides gras volatiles (AGV) et la production de gaz à 12, 24, 36 et 48 h. L’interaction entre PMU, TBM et GP a été positive et significative. L’apport de la mélasse-urée en plus du tourteau et les gousses de Piliostigma a permis d’améliorer la valeur nutritive de la paille de riz.
The associative effect between the constituents of a ration can positively or negatively affect ruminant animals ‘performances, depending on the nature of the constituents of the ration. Moreover, predicting the feeding value of the ration by simply adding the individual feed value of the constituents has some limitations. Two trials were conducted to assess the associative effect between unhulled cottonseed meal (TBM) and Piliostigma reticulatum pods (GP) on voluntary intake (trial 1) and in vitro fermentation using the gas production technique (trial 2) of rice straw alone (PS) or PS with molasses and urea (PMU). TBM was added to PS or PMU in the proportion: 70/30 (PS/TBM or PMU/TBM). The GPs were then substituted for the TBM in the proportion of 15%. Four rations were formulated for trial 1: R1 (70% PS + 30% TBM), R2 (70% PMU + 30% TBM), R3 (70% PMU + 15% TBM + 15% GP) and R4 = R3 but TBM and GP distributed sequentially. Two other rations: 100% PS and 100% PMU in addition to the previous rations, served as substrates for the gas test. The R2 ration compared to R1 significantly (p < 0.05) improved the growth performance of the young bulls. On the other hand, the supply of GP had no effect because the GP were not consumed throughout the trial. Unlike the PS and TBM treatments (trial 2), the PMU and TBM treatments generated a significant increase (p < 0.05) in the hourly rate (c) of fermentation of the insoluble fraction (b), the concentration of volatile fatty acids (VFAs) and gas production at 12, 24, 36 and 48 h. The interaction between PMU, TBM and GP was positive and significant. The supply of molasses and urea in addition to cottonseed cake and Piliostigma pods improved the nutritional value of rice straw.
Tesis sobre el tema "Essaim de bulles"
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Riboux, Guillaume. "Hydrodynamique d'un essaim de bulles en ascension". Toulouse, INPT, 2007. http://ethesis.inp-toulouse.fr/archive/00000465/.
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In many applications, bubbles are used to agitate a liquid in order to enhance mixing and transfer. This work is devoted to the study of the hydrodynamics in a stable bubble column. Experimentally, we have determined the properties of the velocity fluctuations inside and behind a homogeneous swarm of rising bubbles for different bubble sizes and gas volume fractions [alpha] : selfsimilarity in [alpha] to the power 0,4, wave number power law in -3 and integral length scale controlled by buoyancy. Numerically, we have reproduced these properties by means of large-scale simulations, the bubbles being modeled by volume-forces. This confirms that the dynamics is controlled by wake interactionsDans de nombreuses applications, des bulles sont utilisées pour agiter un liquide afin de favoriser le mélange et les transferts. Ce travail est consacré à l'étude de l'hydrodynamique d'une colonne à bulles. Expérimentalement, nous avons déterminé les propriétés des fluctuations de vitesses à l'intérieur et derrière un essaim de bulles homogène en ascension pour différentes tailles de bulles et fractions volumiques [alpha] : auto-similarité en [alpha] à la puissance 0,4, spectre en nombre d'onde à la puissance -3 et échelle intégrale de longueur imposée par la force de flottabilité. Numériquement, nous avons reproduit ces propriétés par simulation des grandes échelles en modélisant les bulles par des volumes-forces. Nous avons ainsi prouvé que la dynamique est maîtrisée par les interactions des sillages
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Riboux, Guillaume Risso Frédéric Legendre Dominique. "Hydrodynamique d'un essaim de bulles en ascension". Toulouse : INP Toulouse, 2008. http://ethesis.inp-toulouse.fr/archive/00000465.
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Simonnet, Marie. "Étude expérimentale du mouvement de bulles en essaim : application à la simulation numérique de colonnes à bulles". Vandoeuvre-les-Nancy, INPL, 2005. http://docnum.univ-lorraine.fr/public/INPL/2005_SIMONNET_M.pdf.
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L'objectif de déterminer l'effet de la densité de bulles sur la loi de traînée, une étude à la fois expérimentale et numérique a été menée. L'utilisation de la vélocimétrie laser Doppler et d'une double sonde optique dans une colonne à bulles a conduit à d'importants résultats sur la vitesse relative des bulles pour une dispersion eau pure/air. Il a notamment été mis en évidence une diminution de cette dernière avec le taux de vide local jusqu'à une valeur de 15 %, puis une augmentation au-delà. Ces évolutions sont le résultat d'une compétition entre différents phénomènes, tels que la gêne stérique, la turbulence et l'aspiration dans les sillages. Basée sur ces conclusions, une corrélation de traînée a été obtenue puis testée dans une approche de Mécanique des Fluides Numérique (MFN). L'intérêt de la corrélation a été démontrée, notamment pour la prédiction des régimes de fonctionnement de la colonne ainsi que pour une bonne description des profils de vitesse moyenne de liquideBoth experimental and numerical studies have been performed in aIder to highlight the influence of the bubbles density on the drag law. Important results concerning the relative velocity of bubbles in a swarm have been obtained thanks to laser Doppler velocimetry and optical probe measurements in a pure water / air bubble column. Ln particular, it has been shawn that the relative velocity decreases with the local void fraction up to a critical value of 15 % and increases beyond. These evolutions result from a competition between various phenomena, such as turbulence, hindrance and wake acceleration effects. Based on these conclusions, a drag correlation was obtained and tested in a Computational Fluid Dynamics (CFD) code. The significance of the drag law formulation has been demonstrated, especially for the correct description of the transition between the flow regimes of a bubble column and for the accurate prediction of the liquid velocity profiles measured
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Simonnet, Marie Midoux Noël. "Étude expérimentale du mouvement de bulles en essaim application à la simulation numérique de colonnes à bulles /". Vandoeuvre-les-Nancy : INPL, 2005. http://www.scd.inpl-nancy.fr/theses/2005_SIMONNET_M.pdf.
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Santiago, Pelaez Zapata Daniel. "Beyond the Sea Surface : Exploring Ocean Wave Measurements From Multiple Perspectives". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASM004.
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Cette thèse explore les mesures de vagues océaniques sous plusieurs perspectives, étendant l'analyse au-delà de leur manifestation visuelle à la surface de la mer. Les limitations existantes dans les technologies de mesure entravent une compréhension complète d'aspects tels que le spectre directionnel des vagues, les processus de déferlement et les essaims de bulles générées par les vagues. Cette étude intègre des données provenant de différentes plates-formes, y compris de capteurs installés au fond, de bouées de surface et de satellites, abordant les limitations de couverture spatiale et temporelle. Une nouvelle technique basée sur la transformation en ondelettes pour l'estimation du spectre directionnel de vagues est présentée, montrant des performances cohérentes et des avantages par rapport aux méthodes conventionnelles. L'analyse de la propagation directionnelle des vagues révèle des distributions étroites au pic spectral et un élargissement asymétrique aux fréquences plus basses et plus élevées. La thèse compare également les données des bouées GPS avec les observations satellitaires de la mission CFOSAT/SWIM. Les propriétés acoustiques des vagues océaniques sont examinées à travers des mesures d'essaims de bulles, révélant une relation entre la vitesse du vent, la profondeur de l'essaim de bulles et la couverture d'écume. Le rôle de la circulation de Langmuir dans le transport des essaims de bulles est mis en évidence. Le bruit sous-marin et sa corrélation avec les variables environnementales sont étudiés à l'aide d'un hydrophone monté sur le fond. Dans l'ensemble, la thèse fournit une description complète des vagues océaniques, offrant des perspectives précieuses sur les interactions complexes entre l'air et la merThis thesis explores ocean wave measurements from multiple perspectives, extending the analysis beyond their visual manifestation on the sea surface. Existing limitations in measurement technologies hinder a full understanding of aspects such as directional wave spectrum, wave breaking processes, and wave-induced bubble plumes. This study integrates data from various platforms, including bottom-mounted sensors, surface buoys, and satellites, addressing spatial and temporal coverage limitations. A novel wavelet-based technique for directional wave spectrum estimation is presented, showing consistent performance and advantages over conventional methods. Analysis of directional wave spreading reveals narrow distributions at the spectral peak and asymmetric broadening at lower and higher frequencies. The thesis also compares GPS buoy data with satellite-based observations from the CFOSAT/SWIM mission. The acoustic properties of ocean waves are examined through measurements of bubble plumes, revealing a relationship between wind speed, bubble plume depth, and whitecapping coverage. The role of Langmuir circulation in transporting bubble plumes is highlighted. Underwater noise and its correlation with environmental variables are investigated using a bottom-mounted hydrophone. Overall, the thesis provides a comprehensive description of ocean waves, offering valuable insights into complex air-sea interactions
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Tran, Thi Bich Ngoc. "Three essays on financial instability of emerging stock markets". Rennes 1, 2011. http://www.theses.fr/2011REN1G030.
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Cette thèse vise à étudier certains risques potentiellement importants sur les marchés boursiers émergents après leur libéralisation. Ces risques comprennent les bulles éclatant périodiquement sur les prix des actions, la contagion qui est définie comme une augmentation significative des corrélations entre les marchés, et l’impact déstabilisant des hedge funds sur les marchés boursiers. Cette thèse se concentre en particulier sur les marchés asiatiques et ceux de l’Amérique Latine au cours des années 90 et 2000. La méthodologie empirique appropriée est utilisée, tels que le robuste test de non-cointégration développé par Taylor et Peel (1998), les modèles dynamiques de corrélation conditionnelle (DCC-GARCH (1,1)), les modèles autoregressifs vectoriels (VAR), les tests de non-causalité à la Granger, les fonctions de réponse à des chocs et la décomposition de la variance des erreurs de prévision. Les résultats montrent d’abord qu’il existe des bulles spéculatives dans la plupart des marchés étudiés et que l'ouverture du marché des actions semble être un facteur important qui est positivement lié à la formation de bulles spéculatives dans les marchés de l’Asie et de l’Amérique Latine. Ensuite, l’existence des effets de contagion est détectée pendant la crise mexicaine de 1994, la crise asiatique de 1997, et la crise américaine des subprimes de 2007. Cette dernière se trouve être la plus contagieuse, tandis que la crise mexicaine est la moins contagieuse et présente seulement des effets régionaux. Enfin, les résultats montrent que les hedge funds se trouvent à exercer un impact sur les marchés boursiers dû à leur importante contribution à la variance des rendements des marchés boursiersThis dissertation aims to study some potentially major risks in emerging stock markets after their liberalization. These risks include periodically collapsing speculative bubbles on stock prices, contagion defined as a significant increase in correlations between markets and the market destabilizing behavior of hedge funds. Appropriate empirical methodology is used, such as the robust non-cointegration test developed by Taylor and Peel (1998), the dynamic conditional correlation models (DCC-GARCH(1,1)), the Vector Autoregressive (VAR) models with consecutive rolling windows, Granger non-causality tests, the impulse response functions to a shock, and the forecast error variance decomposition. This dissertation focuses in particular on markets in Asian and Latin American regions during the 1990s and 2000s. The results are the followings. Firstly, there exist speculative bubbles in most of studied markets and the equity market openness seems to be an important factor which is significantly positive related to the formation of speculative bubbles in both Asian and Latin American regions. Secondly, the evidence of contagion effects is detected during the 1994 Mexican crisis, the 1997 Asian crisis, and the 2007 US subprime crisis. The US subprime crisis is found to be the most contagious while the Mexican crisis is the least contagious and has only regional effects. Lastly, hedge funds are found to exert an impact on stock markets due to their significant contribution to the variance of stock markets' returns
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Boullot, Mathieu. "Essays on asset bubbles and secular stagnation". Thesis, Paris 1, 2019. http://www.theses.fr/2019PA01E007/document.
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Le premier chapitre questionne l'intuition conventionnelle selon laquelle une forte concentration au plus haut de la distribution des revenus devrait favoriser l'émergence de bulles d'actifs rationnelles. J'utilise un modèle OLG avec des fictions financières et des agents hétérogènes qui diffèrent en termes de taux d'épargne, portefeuilles d'actifs et talents. Je montre qu'une forte concentration promeut l'émergence de bulles si et seulement si ces bulles sont illiquides ou si tous les actifs offrent les mêmes rendements. A l'inverse, lorsque les bulles sont liquides et les actifs liquides paient une prime de liquidité, une faible concentration promeut l'émergence de bulles. Le deuxième papier étudie les conditions sous lesquelles une bulle d'actif augmente le PIB dans un modèle OLG-Nouveau Keynesien incluant le capital. Je montre que la stagnation séculaire est une condition nécessaire mais non suffisante. En effet, les bulles ne stimulent le PIB que si la demande agrégée est très fortement déficiente. Le troisième papier démontre que les modèle Nouveaux Keynesiens (NK) font des prédictions paradoxales lorsque la demande agrégée est chroniquement déficiente - un boom séculaire plutôt qu'une stagnation séculaire, et analyse comment ajuster ces modèles pour qu'ils deviennent viables dans l'environnement actuel. Je souligne l'importance cruciale des élasticités de l'offre et de la demande d'actifs par rapport au PIB à long terme ; j'effectue également une connexion entre le boom séculaire et d'autres prévisions paradoxales du modèle NKThe first chapter questions the conventional intuition that a high concentration of income at the top of the distribution should promote the emergence of rational asset bubbles. I use an OLG model with financial fictions and heterogeneous agents that differ in terms of savings rate, portfolio choices and skills. I show that a high concentration at the top promotes the emergence of asset bubbles if and only if those asset bubbles are illiquid or financial markets are arbitrage-free. Instead, if asset bubbles are liquid and liquid assets pay a premium under illiquid assets, a low concentration promotes the emergence of asset bubbles. The second chapter studies the circumstances under which asset bubbles are expansionary in an OLG-New Keynesian that includes capital. I show that secular stagnation is a necessary but not sufficient condition. Indeed, asset bubbles stimulate investment, consumption and output if and only if there's a strong shortage of aggregate demand. Finally, the third paper shows that "standard" New Keynesian models make puzzling predictions when aggregate demand is chronically deficient they predict a secular boom, and seeks to understand how those models must be adjusted to analyze secular stagnation. I emphasize the crucial role of the long run elasticities of asset demand and supply with respect to the output gap in general equilibrium; and I also connect the secular boom to other puzzling predictions of the New Keynesian model
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Moysan, Gwenael. "Essais sur les Crises Financières". Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2013. http://tel.archives-ouvertes.fr/tel-00969039.
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La thèse traite de differents aspects des crises financières et de leur gestion par les régulateurs. Les systèmes financiers complexes, tel le réseau interbancaire, peuvent être modélisés par une approche de type réseau, pour calculer la propagation des faillites et modéliser le risque systémique. Partant d'un réseau d'agents identiquement capitalisés, l'impact d'un ratio de capitalisation est testé selon l'horizon de maximisation des profits des agents. Performante lorsque les agents optimisent en horizon infini, la prévention du risque systémique par ce ratio peut créer d'importants problèmes de liquidité lorsque les agents sont myopes. L'effet des taux d'intérêts sur les bulles de crédit est analysé en partant d'un modèle basé sur une économie de production, dans laquelle les entreprises font face à de rares opportunités d'investissement. Lorsqu'elles investissent, ces entreprises ont recours à de la dette court-terme, limitée à une partie de leur valeur boursière. Dans ce modèle générant des bulles sur les prix des firmes, les taux d'intérêts sur la dette n'ont que peu d'effets sur les prix des firmes. En outre, des réserves sont émises concernant la présence de véritables bulles dans les prix vis-à-vis des concepts historiques. Le précédent modèle est étendu en introduisant une part de dette à long-terme dans le capital des firmes. Dans ce cadre, les valeurs boursières des firmes sont très réactives au taux d'intérêt, étant même discontinues lors de chocs de taux persistants. Par ailleurs, l'économie de production peut atteindre un état bullier: les prix des firmes reflètent les gains de capital uniquement dus à la dette.
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Simion, Stefania. "Empirical essays on youths' labour markets and education". Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24742.
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The first chapter assesses the impact of the cohort size on labour market outcomes. Using exogenous variation and micro-level data for France, the UK and the US, we study the effect of supply shocks measured at different ages on unemployment rates and wages during a cohort's life cycle. The results from an IV estimation show that the largest magnitude of the effects is found when the cohort size is measured at age 25. The impact of both wages and unemployment rates are temporary, however, both decreasing with time. The second chapter analyses the effects of large inflows of foreign students on English undergraduates. Our results confirm previous findings that there is no overall effect, but we identify changes in the distribution of natives. We find that top performing English students are crowded in by foreign students. It is also mainly English-born males, natives who do not have English as their mother tongue and those of Asian ethnic origins that are crowded in by foreign students. In chapter three, we aim to understand the short-term effects of changes in the level of the tuition fees charged by English universities on students' geographic mobility. Our results suggest that the increase in tuition fees in 2006/07 charged by English universities led students to enrol into universities that are closer to home, with a larger effect experienced by men and White students. Moreover, we find that students are less likely to move to universities located in rich areas.
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Solcan, Mihaela. "Essays on Macroeconomic Price Adjustments". Thesis, Lyon 2, 2013. http://www.theses.fr/2013LYO22014.
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Au cours de la dernière décennie, les prix des logements ont augmenté de façon spectaculaire dans plusieurs pays à travers le monde. Par exemple, les prix des logements aux États-Unis, en Espagne et en Irlande ont été marqués par des cycles d'expansion et de récession les plus marquants de leur histoire. L'augmentation concomitante des prix des logements (et dans certains cas l’occurrence des épisodes d'expansion - récession) dans de nombreuses économies avancées soulève quelques questions importantes. Y a t-il eu une bulle immobilière dans les pays avancés? Quels sont les principaux déterminants de l'évolution des prix des logements dans ces pays? Est-ce que les marchés immobiliers des pays avancés sont-ils interdépendants? Le premier chapitre propose une modélisation structurelle des modèles VAR Bayésiens pour les États-Unis, la France, l'Espagne et la Grèce qui examinent les effets relatifs de l'évolution du secteur réel de production, du secteur financier et des flux internationaux de capitaux sur les marchés du logement. Un deuxième exercice tente d'identifier la présence de régimes de bulles immobilières à partir d’une modélisation Markovienne à deux états. Les principaux résultats liés au marche américain montrent que les entrées de capitaux étrangers, mesurées par le solde de la balance courante en pourcentage du PIB, comptent pour plus de 30 % de la variance des chocs qui frappent les prix des logements, tandis que les taux d’intérêt contribuent pour environ 38 %. En France, la politique monétaire a le plus grand pouvoir explicatif des évolutions du marché du logement, tandis qu'en Espagne et en Grèce, les taux hypothécaires variables et les investissements dans le logement exercent la plus grande influence sur le marché du logement. Tous les pays ont connu un régime de bulle immobilière sur la majeure partie des années 2000.Le deuxième chapitre utilise une approche de type Global VAR (ou GVAR) qui porte sur la modélisation des interdépendances internationales des prix immobiliers. Le modèle GVAR a été estimé empiriquement en utilisant des données trimestrielles de sept pays, pour la période 1987-2011. Les résultats montrent que les chocs des prix immobiliers originaires des États-Unis ont de fortes répercussions sur tous les pays, avec les plus fortes magnitudes observées pour l'Irlande. Ce résultat suggère que les marchés immobiliers pourraient être soumis à des effets de contagion du comportement des marchés financiers et que le secteur immobilier peut être analysé comme un actif spéculatif. Les liens entre les taux d'intérêt réels à long terme sont positifs et statistiquement significatifs dans tous les pays, même si ils ont un rôle limité sur l'évolution des prix immobiliers. Les chocs négatifs sur les prix immobiliers aux États-Unis ont des effets négatifs et statistiquement significatifs sur le PIB réel aux États-Unis, le Canada et l'Irlande.Le troisième chapitre est consacré au financement de la première guerre mondiale par les Etats-Unis et le rôle de la War Finance Corporation (WFC). Plus spécifiquement, on s’intéresse aux fluctuations des rendements des bons du Trésor américain émis entre novembre 1917 et décembre 1920. L’analyse économétrique est basée sur des techniques de séries temporelles Bayésiennes. Les principaux résultats montrent que les chocs positifs sur les achats de la WFC engendrent une réponse négative et statistiquement significative sur tous les types de rendements des bons de guerre. En outre, les achats de la WFC des bons Liberty et Victory, à l'exception du premier prêt des bons Liberty, ont eu un effet statistiquement significatif sur l'évolution des taux à court terme. Les achats de la WFC de la deuxième et de la quatrième émission des bons Liberty ont eu des effets significatifs et positifs sur les taux à court terme, ce qui suggère une déformation de la courbe des tauxDuring the last decade, housing prices have increased dramatically in several countries around the world. For instance, housing prices in the United States, Spain, and Ireland have been marked by one of the most striking boom-bust cycles in their history. The concomitant increase in housing prices (and in some cases boom-bust episodes) across many advanced economies raises the following important questions. Was there a housing bubble across advanced countries? What are the main determinants of the housing price movements in these countries? Are the advanced countries' housing markets interrelated? The first chapter of the dissertation estimates a set of structural Bayesian VAR models for the U.S., France, Spain, and Greece that examine the relative effects of developments in the real production sector, the financial sector, and international capital flows on the housing market. A second exercise attempts to identify the presence of housing price bubble regimes by estimating a set of two state Markov-switching Bayesian VAR models. The main results for the U.S. show that foreign capital inflows, measured by the current account balance as a percentage of GDP, account for more than 30\% of the variance of the shocks hitting housing prices, while adjustable mortgage rates contribute about 38\%. In France, monetary policy has the largest explanatory power for the housing market evolutions, while in Spain and Greece, the variable mortgage rates and housing investments exert the largest influence on the housing market. All the countries experienced a bubble regime over most of the 2000s. The second chapter uses a Global VAR model estimated using quarterly data from seven countries, for the period 1987-2011, to analyze the interdependencies that exist between domestic and international factors in housing markets. We find that housing price shocks originating in the U.S. have large spillover effects on all the countries, with the largest magnitudes on Ireland. This result suggests that housing markets may be subject to contagion effects and that housing can be analyzed as a speculative asset, based on international data spanning the past two decades. Linkages in long-run real interest rates are positive and statistically significant across all the countries, although they have a limited role on the evolution of housing prices. Negative shocks to the U.S. housing prices have negative and statistically significant effects on real GDP in the U.S., Canada, and Ireland. The third chapter studies the price fluctuations of war bonds issued by the U.S Treasury in order to finance the World War I between November 1917 and December 1920. Bayesian time series techniques are used to carry out the analyses. We are focusing on the effects that the bond-purchasing program of the War Finance Corporation (WFC) had on the evolution of war bond yields. Our main results show that positive shocks to WFC purchases display a negative and statistically significant effect on all types of war bond yields. Furthermore, WFC purchases of Liberty and Victory Bonds, except the First Liberty Loan, had a statistically significant effect on the evolution of commercial paper rates. WFC purchases of the Second and Fourth Liberty Bonds had significant and positive effects on commercial paper rates, suggesting a twist in the bond yield curve
Libros sobre el tema "Essaim de bulles"
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Liu, Yu. Song ni yi ke zi dan: Send you a bullet. 8a ed. Shanghai: Shanghai san lian shu dian, 2010.
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Calkins, Lucy. Boxes and bullets: Personal and persuasive essays. Portsmouth, NH: Firsthand, an imprint of Heinemann, 2013.
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Traimond, Bernard. Les fêtes du taureau: Essai d'ethnologie historique. Bordeaux: AA éditions, 1996.
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Mbaye, Amina Sow. Petit essai sur la vieillesse: Suivi de, "Les bulles" : recueil de poèmes. [Dakar: s.n., 2006.
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Sacrifice et labour en Grèce ancienne: Essai d'anthropologie religieuse. Paris: Découverte, 1986.
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Pierre, Bertrand. Les ailes du songe: Rêve et réalité dans la bulle humaine : essai. Montréal: Humanitas Nouvelle optique, 1992.
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Reed, Ishmael. Mixing it up: Taking on the media bullies and other reflections. New York: Da Capo Press, 2008.
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Ruzicka, Jan. A Plea for Restraint. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198779605.003.0008.
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This essay reconstructs Hedley Bull’s position on nuclear proliferation in The Anarchical Society. Avoiding the extremes of nuclear optimism and pessimism, Bull provided nuanced arguments about the relationship between nuclear proliferation and international order. Bull remained agnostic as to what the world of many nuclear powers would look like. He used this unpredictability to emphasize the notion of restraint involving both superpower cooperation to prevent states from going nuclear as well as the exercise of self-restraint on the part of superpowers. Showing restraint was crucial to the continued existence of the states system. Bull worried that proliferation represented a particular threat to it. Nuclear weapons exposed states to the prospect of sudden and complete destruction. This could lead to the abolition of the state system and its replacement with world government, to which Bull was strongly opposed. The conclusion illustrates Bull’s relevance in relation to the recent pursuit of non-proliferation.
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Humphreys, Adam. Bull’s Political Vision. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198779605.003.0018.
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Although Bull is often identified as a theorist of international society, this volume has shown that there is more to The Anarchical Society than international society, narrowly construed. The contemporary relevance of Bull’s work is clearest when we recognize the flexibility of his conceptual framework and, in particular, the often overlooked potential of his concept of the ‘world political system’, of which modern international society is only a part. It is also helpful to recognize the provisional nature of Bull’s intellectual priorities and of his empirical and evaluative judgements. Bull’s argument that international society provides the surest route to world order reflected his judgement at ‘present’ and we can revise it today without doing violence to his intellectual project. This concluding essay highlights the flexibility of Bull’s approach and the provisional nature of his judgements while also reviewing the limits of this flexibility and identifying possible future directions of inquiry.
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Bain, William. The Anarchical Society as Christian Political Theology. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198779605.003.0004.
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It is widely accepted that in The Anarchical Society—the key text of the English School—Hedley Bull presents and defends the Grotian conception of international relations. This essay argues that Bull’s thinking about order is indebted to a medieval theological dispute about the nature of God and the extent of his power. This dispute yields a way of knowing and explaining the world that stresses the artificial nature of political relations, domestic and international. In other words, order between states is instituted in the same way that God made the universe, through will and artifice. Once this theological ground is uncovered it becomes apparent that Bull’s account of international order is consistent, not with Grotius, but with the thought of Thomas Hobbes. One of the crucial implications of this argument is that international society has not outgrown its European and Christian roots to the extent that Bull suggests.
Capítulos de libros sobre el tema "Essaim de bulles"
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Hollingworth, Brian. "An Essay on Irish Bulls". En Maria Edgeworth’s Irish Writing, 47–68. London: Palgrave Macmillan UK, 1997. http://dx.doi.org/10.1057/9780230374416_4.
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Edzerza, Allen y Dave Porter. "Colonialism and Mining". En Heavy Metal, 9–16. Cambridge, UK: Open Book Publishers, 2024. http://dx.doi.org/10.11647/obp.0373.02.
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This essay reflects on the historical and ongoing colonial appropriation of land and resources from Indigenous peoples. Beginning with the 1493 Inter Caetera Papal Bull, which laid the foundation for the Doctrine of Discovery, and continuing through subsequent colonial expansions, the authors trace a narrative of systematic appropriation of Indigenous land and resources by European powers, in connection with the emergence of Canada as a major player in the global mining sector over the past 150 years. The essay highlights how Indigenous peoples have long fought to reclaim their rights, examining repeated legal precedents that have affirmed Indigenous rights and title, and the need to consult and accommodate First Nations in the management of resources on their territories. Indigenous leadership will be essential in shaping the future of the mining industry, calling for a fundamental shift towards environmentally and socially responsible mining practices, rooted in mutual respect and a shared commitment to the stewardship of Earth’s resources for future generations.
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"DEATH OF CHARLES BULLER". En Essays on Politics and Society, 205–8. University of California Press, 2022. http://dx.doi.org/10.1525/9780520387928-018.
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Quin, Jack. "Coda. Yeats’s Epitaphs". En W. B. Yeats and the Language of Sculpture, 178–84. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780192843159.003.0007.
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Abstract The coda considers engraving and epitaphs as Yeats’s final experiment in sculptural analogies for poetry. This includes an 1891 love poem to Maud Gonne, his deliberative naming of the Rising leaders in “Easter, 1916,” multiple versions of “To be Carved on a Stone at Thoor Ballylee,” and his self-epitaph in the final lines of “Under Ben Bulben.” Yeats’s analogy of writing as carving invites comparison with Wordsworth’s Essays upon Epitaphs, John Ruskin’s lecture on engraving as “the Art of the Scratch,” and Walter Pater’s essay on “Style.” In an echo of poems discussed previously in the monograph, the “epitaphic” verses under consideration reflect on the practice of engraving, and what remains or endures beyond the grave. Yeats’s reserve and economy of language in poems written to be engraved suggests a mode of writing that is distinct from the elegy, as Wordsworth asserts in his essays.
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Foster, Nigel. "10. Skills for Success in Coursework Assessments". En Concentrate Questions and Answers EU Law, 202–12. Oxford University Press, 2020. http://dx.doi.org/10.1093/he/9780198853190.003.0010.
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The Concentrate Questions and Answers series offer the best preparation for tackling exam questions. Each book includes typical questions, bullet-pointed answer plans and suggested answers, author commentary, and illustrative diagrams and flowcharts. This chapter presents a sample coursework essay question on EU law along with the examiner’s guidance to approaching coursework questions, tips, an answer plan, and a suggested answer for the sample question.
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Warfa, Dominique. "Des bulles et des aliens, parcours historique dans la bande dessinée de science-fiction française (inédit, 2010)". En Une brève histoire de la science-fiction belge francophone et autres essais, 357–402. Presses universitaires de Liège, 2018. http://dx.doi.org/10.4000/books.pulg.2792.
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Russell, Roseanne. "15. Skills for success in coursework assessments". En Concentrate Questions and Answers Employment Law. Oxford University Press, 2017. http://dx.doi.org/10.1093/he/9780198745198.003.0015.
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The Concentrate Questions and Answers series offer the best preparation for tackling exam questions. Each book includes typical questions, bullet-pointed answer plans, suggested answers and author commentary. This chapter gives advice on skills for success in coursework assessments. It covers how best to research a topic, what is meant by ‘critical analysis’, how to maintain relevance and focus on a question, and how to reference appropriately. The chapter ends with a handy checklist for students to use when working on an employment law essay.
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Russell, Roseanne. "15. Skills for success in coursework assessments". En Concentrate Questions and Answers Employment Law, 217–20. Oxford University Press, 2021. http://dx.doi.org/10.1093/he/9780198856757.003.0015.
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The Concentrate Questions and Answers series offers the best preparation for tackling exam questions. Each book includes typical questions, bullet-pointed answer plans, suggested answers, and author commentary. This chapter gives advice on skills for success in coursework assessments. It covers researching, planning, and preparing to write as well as how best to research a topic, what is meant by ‘critical analysis’, how to maintain relevance and focus on a question, and how to reference appropriately. The chapter ends with a handy checklist for students to use when working on an employment law essay.
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Foster, Nigel. "9. Sex Discrimination and Equality Law". En Concentrate Questions and Answers EU Law, 180–201. Oxford University Press, 2020. http://dx.doi.org/10.1093/he/9780198853190.003.0009.
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The Concentrate Questions and Answers series offer the best preparation for tackling exam questions. Each book includes typical questions, bullet-pointed answer plans and suggested answers, author commentary, and illustrative diagrams and flowcharts. This chapter presents sample exam questions along with examiner’s tips, answer plans, and suggested answers about EU law on sex discrimination and equality. The questions have been divided into a general question on the inclusion of sex discrimination provision in the first place; problem questions on aspects of equal pay and equal treatment; an essay question on a specific development in this area of law, which considers the overlapping area of pay and pensions and a problem on pregnancy-related matters; and an essay question on the expansion of areas protected by equality legislation.
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Drèze, Jean. "Top-up". En Sense and Solidarity, 261–313. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198833468.003.0011.
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This chapter covers a range of issues that do not fit in earlier chapters. These include urban poverty, universal basic income, the Gujarat model, electoral politics, India's bullet train, the economics of corruption, the aberrations of the caste system, and India's disastrous experience with demonetisation in late 2016. The book concludes with an extended essay on “Development and Public‐spiritedness”. This essay takes issue with the notion, common in economics, that people generally act out of self‐interest. This assumption has no theoretical or empirical basis. Public‐spiritedness, in the sense of a reasoned habit of consideration for the public interest, is a common feature of social life. Expanding the scope of public‐spiritedness is an important aspect of social development.
Actas de conferencias sobre el tema "Essaim de bulles"
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Mota, Ana Carolina y Jaise Silva Ferreira. "Rótulos de especialidades farmacêuticas de uso tópico e/ou dermatológico comercializadas em drogarias". En Semana Científica da Faculdade de Medicina de Campos. Faculdade de Medicina de Campos, 2022. http://dx.doi.org/10.29184/anaisscfmc.v12022p28.
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A administração tópica de medicamentos refere-se a sua aplicação sobre a pele, de produtos como cremes e pomadas. São classificadas como preparações semissólidas, e geralmente compostas por um veículo base. O estudo foi realizado em uma drogaria, para obtenção de informações contidas nos rótulos e no bulário eletrônico da Agência Nacional de Vigilância Sanitária (ANVISA). Foram selecionadas 20 especialidades farmacêuticas de uso tópico e/ou dermatológico (cremes e pomadas), das classes farmacológicas antimicrobiana e antifúngica (ou associações), similares e de referência. Os rótulos foram observados para anotação de informações como forma farmacêutica e princípio ativo. Das bulas, foram anotados: composição e classe farmacológica. Quanto a serem do tipo similar ou referência, foi consultada a lista de medicamentos similares intercambiáveis, conforme RDC 58/2014. Posteriormente, foi verificada a possibilidade de divergência, após busca na literatura dos conceitos de composição de creme e pomada, avaliação da forma farmacêutica intitulada no rótulo e insumos inertes utilizados na base da especialidade farmacêutica. Das 20 especialidades farmacêuticas, 15 tinham descrito em seus rótulos o título de creme, e apenas 5 continham o título de pomada. Quanto à classe farmacológica, 5 eram antimicrobianas, 6 eram antifúngicas, e 9 tinham associações com outras classes farmacológicas. Em relação à qualificação das especialidades, quanto a serem similares ou referência, 8 eram do tipo similar e 12 eram do tipo referência. Quanto as possíveis divergências, em relação à classificação da forma farmacêutica, foram encontradas em 10 amostras. Dessas, as intituladas como creme, foram qualificadas por apresentarem divergências devido a presença do petrolato branco, e em algumas, a depender da concentração. Salienta-se que nas composições descritas nas bulas das especialidades farmacêuticas não consta a concentração de cada componente, apenas os seus nomes, fazendo com que essas divergências sejam possíveis, mas não confirmatórias.
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Amaru, Victória Nunes y Felipe Marti Garcia Chavez. "ABORDAGENS TERAPÊUTICAS IMUNOLÓGICAS NO MANEJO DA EPIDERMÓLISE BOLHOSA: UMA REVISÃO DE LITERATURA". En I Congresso Brasileiro de Imunologia On-line. Revista Multidisciplinar em Saúde, 2021. http://dx.doi.org/10.51161/rems/972.
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Introdução: A epidermólise bolhosa (EB) é uma doença congênita, rara, autossômica dominante, autoimune da pele que pode ter acometimento multissistêmico e levar a malignidade. Ocorre devido a mutações nas proteínas de ancoragem entre a epiderme e a derme, e se caracteriza pela formação de vesículas ou bolhas principalmente em locais de maior atrito. Essa patologia é subdivida em quatro tipos de acordo com a sua proteína mutante: simples, juncional, distrófica e síndrome de Kindler. Além disso, a EB apresenta elevada morbimortalidade pois não há tratamento específico. Objetivos: Realizar um levantamento bibliográfico para descrever e comparar as principais atualizações terapêuticas de caráter imunológico que auxiliam no tratamento da epidermólise bolhosa a fim de conscientizar os profissionais da saúde acerca do tema. Material e métodos: Trata-se de um estudo de revisão de literatura de cunho descritivo e analítico. Foi realizada uma busca eletrônica nas bases de dados Pubmed, Biblioteca Virtual em Saúde, Schoolar Google e Scielo publicados entre 2013 e 2021. As palavras de busca foram: epidermólise bolhosa, tratamento imunológico, epidermolysis bullosa, immunological treatment. Foram selecionados 14 estudos contendo dados sobre atualizações em tratamentos imunológicos para EB. Resultados: Houve predomínio de 8 opções terapêuticas imunológicas: transplante de células tronco alogênicas, infusão de células tronco mesenquimais, transplante de medula óssea, tratamento subcutâneo com fator estimulador de colônia de granulócitos, rituximab, imunoglobulina intravenosa, apremilast e calcipotrol tópico. Desses, a maioria indicou evidências de melhora clínica na redução de 75% na formação de bolhas, remissão prolongada de bolhas e vesículas por mais de 12 meses e boa resposta ao tratamento, elevando assim a qualidade vida dos portadores de EB. No entanto, ainda não existem evidências de cura e apesar da terapêutica atual resultar em queda da mortalidade, essa ainda representa cerca de 15%. Conclusão: A epidermólise bolhosa apresenta baixa prevalência e tem ampla manifestação clínica. O tratamento ideal se relaciona diretamente com a sintomatologia do paciente, subtipo e extensão da patologia. Portanto, tornam-se necessárias abordagens individualizadas para que a terapêutica possa ser viável, eficaz e com reações adversas toleráveis a fim de melhorar a qualidade de vida dos portadores da doença.
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Silveira, Filomena Aste, João Alfredo Seixas, Helena Torres Passos, Luciana Amaral Lemos, Maria Eduarda Amaral Faria y Caroline Guida Babinski. "Massa anexial e hímen imperfurado - relato de caso". En 45º Congresso da SGORJ XXIV Trocando Ideias. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/jbg-0368-1416-20211311051.
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Introdução: O hímen imperfurado (HI) é uma anomalia congênita incomum do trato genital feminino. É a alteração obstrutiva do aparelho genital feminino mais frequente, com a obstrução completa do introito vaginal pela membrana himenal, e a causa mais comum de hematocolpo, levando à distensão da região vaginal, uterina e de trompas. É frequentemente diagnosticada em meninas adolescentes após a menarca, apresentando-se principalmente com amenorreia e dor abdominal inferior ou retenção urinária, com uma incidência aproximada de 0,05-0,1%. O hímen é uma membrana que se desenvolve embriologicamente por meio da junção do seio urogenital e os bulbos sinovaginais. Nos estágios embrionários, a porção central dessa membrana sofre degeneração de suas células epiteliais, permitindo a conexão entre o vestíbulo e o canal vaginal. Se essa fase falhar, os indivíduos nascem com HI. Raramente faz parte da doença hereditária sistêmica, embora alguns autores tenham enfatizado a necessidade de descartar malformações mullerianas associadas. Relato do caso: Paciente de 13 anos, encaminhada para consulta pré-operatória mediante diagnóstico ultrassonográfico de massa anexial. Apresentava queixa de desconforto pélvico e disúria. Relata ausência de menacme. Ao exame ginecológico, constatou-se a presença de HI. Realizou-se himenectomia, com saída de sangue em jato de coloração escura totalizando um litro e meio. Conclusão: Chamamos a atenção para a importância do exame físico, já que a pseudoimagem de cisto ovariano nada mais era do que hematocolpo e hematometra. O diagnóstico impõe-se mediante a ausência de menarca e a inspeção da genitália externa. A história menstrual e as características sexuais secundárias devem ser investigadas nessas adolescentes. O diagnóstico idealmente deveria ser quando recém-natas, pois ao ser descoberto tardiamente pode trazer complicações para as pacientes portadoras da obstrução. Portanto, os médicos, especialmente urologistas, ginecologistas ou pediatras, devem examinar cuidadosamente todas as pacientes do sexo feminino ao nascer.
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Moura, José David Ferreira. "ANÁLISE DA VIABILIDADE DE CONTENÇÃO EM CORTINA ATIRANTADA". En I Congresso Nacional On-line de Licenciaturas e Pesquisas Acadêmicas. Revista Multidisciplinar de Educação e Meio Ambiente, 2022. http://dx.doi.org/10.51189/conlinps/7517.
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Introdução: As contenções em cortina atirantada são construções que possuem paredes de concreto armado geralmente na vertical, além de possuir tirantes ancorados no terreno e forma que possa estabilizar essa contenção ao solo. sem a possibilidade de ocasionar rupturas ou movimentações de terra indesejadas. As cortinas atirantadas podem ser executadas de baixo para cima ou seja, pelo método ascendente, ou de cima para baixo, ou seja, pelo método descendente. Esse tipo de obra é utilizada para a contenção de taludes ou sub-solos que possam apresentar grandes instabilidades. Esse tipo de obra é capa de suportar grandes ações ocasionadas pelos empuxos oriundos das movimentações de terra e pelos bulbos de tensões existentes no solo devido a constuções vizinhas. Objetivos: Este estudo objetiva tratar sobre a impotância das contenções em cortinas atirantadas em solos de pouca estabilidade, ofertando uma maior segurança ao empreendimento. Material e métodos: Trata-se de um estudo de caratér blibliográfico e explanatório através de livros e artigos. Foram utilizadas as palavras cortina atirantada, contenções e establidade para que pudesse ser colhidos materiais que pudesse compor este estudo em questão, levando em torno de 3 meses para que se pudesse obter os resultados. Resultados: Trata-se de uma obra que envolve um grande valor econômico, principalmente pela grande quantidade de concreto utilizado nesse tipo de construção, grande quantidade de tirantes e mão-de-obra especializada. Em contrapartida esse tipo de empreendimento é capaz de fornecer uma maior estabilidade e segurança na contenção do maciço de terra, promovendo uma maior despreocupação para as constuções que forem realizadas próximas a esse local da contenção em cortna atirantada. Conclusão: Esse tipo de contenção é capaz de fornecer uma alta estabilidade ao solo mas devido ao seu grande custo, faz-se necessário uma análise mais aprimorada solo para que possa chegar a conclusão a respeito da necessidade de uma contenção em cortina atirantada, logo, esse tipo de contenção é capaz de suportar bem as ações oriundas dos empuxos ocasionada pela movimentação do maciço de terra.
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Geraldo, Ana Clara Miranda, Renata Morato Santos, Mario Vicente Giordano, Gustavo Mourão Rodrigues y Andréia Luiz Montenegro da Costa. "Arterite de Takayasu em gestante: relato de caso". En 47º Congresso da SGORJ e Trocando Ideias XXVI. Zeppelini Editorial e Comunicação, 2023. http://dx.doi.org/10.5327/jbg-2965-3711-2023133s1058.
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Introdução: A arterite de Takayasu (TAK) é uma doença vascular inflamatória crônica de origem desconhecida que frequentemente afeta o arco aórtico e seus principais ramos, além de poder afetar outras partes da aorta, artérias pulmonares e artérias renais. Relato de caso: Uma paciente gestante, 27 anos, G5 P4 A0, foi atendida na 19ª semana de gravidez com queixa de cefaleia temporal esquerda intensa, fotofobia, dor lombar e claudicação intermitente que duravam dois anos. A paciente tinha histórico de hipertensão gestacional anterior não tratada. O exame clínico revelou pressão arterial (PA) diferente nos membros: MSD 120 × 80 mmHg, MSE 130 × 90 mmHg, MMII 140 × 100 mmHg. O ritmo cardíaco estava regular, em dois tempos, com bulhas hiperfonéticas e sem sopros. O exame obstétrico mostrou um fundo uterino de 21 cm e tônus normal. A ultrassonografia abdominal revelou irregularidades parietais na artéria aorta e dilatação máxima de 2,2 cm. A angiotomografia computadorizada da artéria aorta e artérias ilíacas mostrou espessamento parietal ao longo da aorta abdominal e porção proximal das artérias ilíacas, com uma lesão estenosante de 4,8 cm no segmento infrarrenal e redução do calibre arterial. A fundoscopia não apresentou anormalidades. Na 29ª semana de gestação, a paciente apresentou sinais de insuficiência venosa nos membros inferiores com dor. O diagnóstico de TAK foi confirmado pela Reumatologia e optou-se por não iniciar terapia imunossupressora. Não foram fornecidos dados sobre o parto, mas a paciente evoluiu satisfatoriamente até o termo. Comentários: A prevalência da TAK em gestantes não está bem estabelecida, o que indica a necessidade de mais estudos. O estreitamento das artérias pode levar à hipertensão gestacional e resultar em crescimento intrauterino restrito (CIUR), óbito fetal ou óbito materno, mas felizmente essas complicações não ocorreram no caso descrito. A paciente apresentou apenas uma medição de PA em membro superior compatível com hipertensão, mas nas consultas subsequentes a PA estava normal, e não foi prescrito AAS para a profilaxia da pré-eclâmpsia (PE) devido à idade gestacional avançada. A atenção primária identificou adequadamente a necessidade de encaminhamento. A disfunção placentária devido à hipertensão durante a gestação é uma das causas de CIUR e é uma complicação da TAK. No tratamento da TAK, é importante considerar as particularidades das gestantes. O Colégio Americano de Reumatologia recomenda o uso de corticoides orais em casos de doença ativa e sintomática. Não há evidências de que a pulsoterapia ofereça melhores resultados obstétricos. O tratamento com corticoides deve ser mantido até a remissão da doença (6 a 12 meses) e, em seguida, deve ser retirado gradualmente. A boa resposta aos corticoides sugere uma origem autoimune da doença. Se a estenose arterial progredir e a isquemia de algum órgão se intensificar, a intervenção cirúrgica deve ser considerada. Em gestantes, recomenda-se monitorar a pressão arterial e, se necessário, utilizar bloqueadores de canal de cálcio ou metildopa.