Academic literature on the topic 'Migrations – Guinée'
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Journal articles on the topic "Migrations – Guinée"
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Populin, Martha, Bode Sambo, and Ludovic Andres. "« Objectif irrigation » : actions de développement, dynamiques agricoles et pratiques de la migration dans la région de Tahoua (Niger)." Afrique contemporaine N° 277, no. 1 (April 26, 2024): 295–314. http://dx.doi.org/10.3917/afco1.277.0295.
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Depuis l’époque coloniale, les habitants de la région de Tahoua (Niger) pratiquent la migration circulaire, surtout vers la Libye et le Golfe de Guinée. Depuis les années 2000, l’essor de l’irrigation, l’arrivée de grands projets de développement et la dégradation des conditions de sécurité dans les pays de destination modifient leurs pratiques migratoires. La « migration » a été remplacée par l’« irrigation » comme principal objectif des jeunes hommes. Cependant, des interrelations existent entre ces deux pratiques, ainsi qu’avec la participation aux activités des projets de développement.
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Price, Gilbert J., Kyle J. Ferguson, Gregory E. Webb, Yue-xing Feng, Pennilyn Higgins, Ai Duc Nguyen, Jian-xin Zhao, Renaud Joannes-Boyau, and Julien Louys. "Seasonal migration of marsupial megafauna in Pleistocene Sahul (Australia–New Guinea)." Proceedings of the Royal Society B: Biological Sciences 284, no. 1863 (September 27, 2017): 20170785. http://dx.doi.org/10.1098/rspb.2017.0785.
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Seasonal two-way migration is an ecological phenomenon observed in a wide range of large-bodied placental mammals, but is conspicuously absent in all modern marsupials. Most extant marsupials are typically smaller in body size in comparison to their migratory placental cousins, possibly limiting their potential to undertake long-distance seasonal migrations. But what about earlier, now-extinct giant marsupial megafauna? Here we present new geochemical analyses which show that the largest of the extinct marsupial herbivores, the enormous wombat-like Diprotodon optatum , undertook seasonal, two-way latitudinal migration in eastern Sahul (Pleistocene Australia–New Guinea). Our data infer that this giant marsupial had the potential to perform round-trip journeys of as much as 200 km annually, which is reminiscent of modern East African mammal migrations. These findings provide, to our knowledge, the first evidence for repetitive seasonal migration in any metatherian (including marsupials), living or extinct, and point to an ecological phenomenon absent from the continent since the Late Pleistocene.
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Nolasco, Carlos, and Nuno Oliveira. "O jogo da vida: estratégias e táticas da mobilidade migratória de futebolistas africanos para Portugal." MOTRICIDADES: Revista da Sociedade de Pesquisa Qualitativa em Motricidade Humana 8, no. 1 (May 7, 2024): 15–28. http://dx.doi.org/10.29181/2594-6463-2024-v8-n1-p15-28.
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O jogo da vida: estratégias e táticas da mobilidade migratória de futebolistas africanos para Portugal ResumoEste texto, numa abordagem relacional, trata do tema das mobilidades migratórias no futebol, debruçando-se sobre a migração de jovens futebolistas africanos, em particular, jogadores da Guiné-Bissau para Portugal. Centra-se essencialmente nos jogadores sem visibilidade mediática, vulneráveis a estratégias e lógicas que os transcendem. Com base numa investigação qualitativa, realizada no âmbito de um projeto europeu sobre a integração de jogadores africanos na Europa, esta comunicação levanta a questão das redes de poder que se estabelecem no país de origem e no país de acolhimento, as estruturas de recrutamento destes jogadores, as motivações para migrar, e as formas de lidar com os projetos falhados devido à impossibilidade de ter sucesso no mundo altamente competitivo do futebol.Palavras-chave: Mobilidades. Migrações. Migração de Trabalho Desportivo. Futebolistas Africanos. Futebol Português. The game of life: strategies and tactics in the migration of African footballers to Portugal AbstractThis text takes a relational approach to the subject of migratory mobility in football, focusing on the migration of young African footballers, particularly players from Guinea-Bissau to Portugal. It essentially focuses on players without media visibility, who are vulnerable to strategies and logics that transcend them. Based on qualitative research carried out as part of a European project on the integration of African players in Europe, this communication raises the question of the power networks that are established in the country of origin and in the host country, the recruitment structures of these players, the motivations for migrating, and the ways of dealing with failed projects due to the impossibility of succeeding in the highly competitive world of football.Keywords: Mobilities. Migrations. Sports Labour Migration. African Footballers. Portuguese Football. El juego de la vida: estrategias y tácticas en la movilidad migratoria de futbolistas africanos a Portugal ResumenEste texto adopta un enfoque relacional del tema de la movilidad migratoria en el fútbol, centrándose en la migración de jóvenes futbolistas africanos, en particular de jugadores de Guinea-Bissau a Portugal. Se centra esencialmente en jugadores sin visibilidad mediática, vulnerables a estrategias y lógicas que los trascienden. A partir de una investigación cualitativa realizada en el marco de un proyecto europeo sobre la integración de los jugadores africanos en Europa, este trabajo plantea la cuestión de las redes de poder que se establecen en el país de origen y en el país de acogida, las estructuras de reclutamiento de estos jugadores, las motivaciones para emigrar y las formas de afrontar los proyectos fracasados debido a la imposibilidad de triunfar en el mundo altamente competitivo del fútbol.Palabras clave: Movilidades. Migraciones. Migración Laboral Deportiva. Futbolistas Africanos. Fútbol Portugués.
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Coëffier, E., D. Joseph, and B. B. Vargaftig. "Activation of guinea pig eosinophils by human recombinant IL-5. Selective priming to platelet-activating factor-acether and interference of its antagonists." Journal of Immunology 147, no. 8 (October 15, 1991): 2595–602. http://dx.doi.org/10.4049/jimmunol.147.8.2595.
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Abstract The potential role of platelet-activating factor (PAF)-acether and of IL-5 as an eosinophil-proliferating, activating, and/or recruiting mediator in asthma led us to study the effects of human (h) rIL-5 (hrIL-5) and PAF-acether, alone or combined, on isolated guinea pig eosinophils. Two populations of eosinophils were separated from peritoneal lavages of polymyxin B-treated guinea pigs upon a discontinuous metrizamide gradient: one of low density (between 20 and 22% of metrizamide, purity: 63 +/- 3%, n = 27) and another of normal density (between 22 and 24% of metrizamide, purity: 87 +/- 2%, n = 16). Chemotactic activity was evaluated on a micro-Boyden chamber, results being expressed as the number of migrating eosinophils (mean +/- SEM) at 40 microns through a cellulose nitrate filter (3 microns pore size) in the presence of the agonist or of the solvent alone. hrIL-5 dose-dependently stimulated normodense eosinophil chemotaxis, reaching a peak at 500 ng/ml (98 +/- 21 migrating eosinophils, n = 5, p less than 0.05). These eosinophils also responded to PAF-acether and to LTB4 and not to FMLP, hrTNF alpha, and LPS. Eosinophil preincubation with hrIL-5 increased significantly the migration by PAF-acether (173 +/- 23 migrating eosinophils with PAF-acether 10 nM after preincubation with hrIL-5 500 ng/ml vs 69 +/- 10 after preincubation with buffer alone, p less than 0.01) and failed to enhance migration by LTB4 or to uncover an activity for FMLP. Migration by PAF-acether was antagonized when the cells were preincubated with the antagonists BN 52021 and WEB 2086, which also inhibited migration by hrIL-5. Eosinophils were auto-desensitized by and to PAF-acether or LTB4, but were not cross-desensitized to each other. Eosinophils desensitized to PAF-acether failed to migrate with hrIL-5, but those desensitized to LTB4 responded to hrIL-5 as controls. hrIL-5 failed to induce the elevation of intracellular free calcium concentration and superoxide anion generation from basal values, whereas preincubation of eosinophils with hrIL-5 induced a significant increase in the rise in intracellular free calcium concentration and in superoxide anion generation by 10 nM PAF-acether but not by LTB4. In conclusion, the in vivo eosinophil migration in allergy may involve hrIL-5, particularly associated to PAF-acether.
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Chavanon, Olivier, Estibaliz Jimenez, Théogène-Octave Gakuba, Sylvia Garcia Delahaye, Mohamed-Walid Benyezzar, and Corina Borri-Anadon. "Expériences de franchissement de frontières et migration « irrégulière » : récits et parcours migratoires de mineurs non accompagnés en France et en Suisse." Criminologie 57, no. 2 (2024): 217–41. https://doi.org/10.7202/1114790ar.
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Dans un contexte mondial d’augmentation des mobilités et de la migration des personnes, les mineurs non accompagnés (MNA) fuient généralement des situations précaires et souvent dangereuses, dont la violence organisée et la guerre. Les projets de départ répondent à des vécus singuliers et localement situés auxquels se mêlent des aspirations multiples (personnelles, familiales, communautaires, etc.) visant l’amélioration des conditions d’existence. Les traumatismes et formes de victimisations vécus par certains dans leur pays d’origine et lors des franchissements irréguliers des frontières peuvent s’aggraver lors de leur arrivée au pays de destination du fait des politiques d’asile restrictives. De plus, en raison de la séparation familiale, des exigences d’adaptation immédiate aux contextes d’accueil et de la vulnérabilité liée à la difficile et aléatoire reconnaissance de leur statut de mineur, les MNA sont exposés à différents risques. Dans ce contexte de précarité, de vulnérabilité et de risque d’exclusion et de victimisation, la prise en charge et la protection des MNA doivent être rapides et efficaces afin de leur offrir un environnement stable et sécuritaire et de permettre leur insertion dans la société d’accueil. À partir de récits de jeunes MNA de diverses origines (Afghanistan, Guinée, Mali, Burkina Faso, Érythrée, Somalie, Algérie, Maroc, Tunisie, etc.) arrivés en France et en Suisse, cet article s’intéresse aux expériences de l’exil, et plus particulièrement à l’expérience du franchissement des frontières dans leurs diverses dimensions (visibles et invisibles) lors des différentes phases de leur parcours migratoire.
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Tolcos, Mary, Annie McDougall, Amy Shields, Yoonyoung Chung, Rachael O’Dowd, Ann Turnley, Megan Wallace, and Sandra Rees. "Intrauterine Growth Restriction Affects Cerebellar Granule Cells in the Developing Guinea Pig Brain." Developmental Neuroscience 40, no. 2 (2018): 162–74. http://dx.doi.org/10.1159/000487797.
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Intrauterine growth restriction (IUGR) can lead to adverse neurodevelopmental sequelae in postnatal life. However, the effects of IUGR on the cerebellum are still to be fully elucidated. A major determinant of growth and development of the cerebellum is proliferation and subsequent migration of cerebellar granule cells. Our objective was to determine whether IUGR, induced by chronic placental insufficiency (CPI) in guinea pigs, results in abnormal cerebellar development due to deficits suggestive of impaired granule cell proliferation and/or migration. CPI was induced by unilateral ligation of the uterine artery at mid-gestation, producing growth-restricted (GR) foetuses at 52 and 60 days of gestation (dg), and neonates at 1 week postnatal age (term approx. 67 dg). Controls were from sham-operated animals. In GR foetuses compared with controls at 52 dg, the external granular layer (EGL) width and internal granular layer (IGL) area were similar. In GR foetuses compared with controls at 60 dg: (a) the EGL width was greater (p < 0.005); (b) the IGL area was smaller (p < 0.005); (c) the density of Ki67-negative (postmitotic) granule cells in the EGL was greater (p < 0.01); (d) the somal area of Purkinje cells was reduced (p < 0.005), and (e) the linear density of Bergmann glia was similar. The EGL width in GR foetuses at 60 dg was comparable to that of 52 dg control and GR foetuses. The pattern of p27-immunoreactivity in the EGL was the inverse of Ki67-immunoreactivity at both foetal ages; there was no difference between control and GR foetuses at either age in the width of p27-immunoreactivity, or in the percentage of the EGL width that it occupied. In the molecular layer of GR neonates compared with controls there was an increase in the areal density of granule cells (p < 0.05) and in the percentage of migrating to total number of granule cells (p < 0.01) at 1 week but not at 60 dg (p > 0.05). Thus, we found no specific evidence that IUGR affects granule cell proliferation, but it alters the normal program of migration to the IGL and, in addition, the development of Purkinje cells. Such alterations will likely affect the development of appropriate circuitry and have implications for cerebellar function.
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Carrier, James G., Andrew J. Strathern, and Gabriele Stuerzen-Hofecker. "Migration and Transformations: Regional Perspectives on New Guinea." Journal of the Royal Anthropological Institute 2, no. 1 (March 1996): 198. http://dx.doi.org/10.2307/3034682.
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Minnegal, Monica, Andrew J. Strathern, and Gabriele Sturzenhofecker. "Migration and Transformations: Regional Perspectives on New Guinea." Pacific Affairs 69, no. 4 (1996): 604. http://dx.doi.org/10.2307/2761217.
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Biersack, Aletta. "Migration and Transformations: Regional Perspectives on New Guinea." American Ethnologist 24, no. 1 (February 1997): 265–68. http://dx.doi.org/10.1525/ae.1997.24.1.265.
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Mejia Noe, Alex Fernando, and Jon Arambarri. "Guía metodológica para la implementación de televisión digital en Bolivia." Project, Design and Management 1, no. 2 (November 18, 2019): 89–110. http://dx.doi.org/10.35992/pdm.v1i2.343.
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The migration to Digital Terrestrial Television or Open Digital Television, with the ISDB-Tb standard, is a transition that involves several changes and heavy investments in the transmission and development of content by television companies and also meansa change for users, since they must also adapt their televisions to have access to the new signal with more audio and video quality. It is necesary to study the regulations, to point out the essential requirements for the different phases of implementation, in joint work with companies and specialized professionals, with international recognized good practices in project management. In Bolivia, Telecommunications Law 164 was amended on August 31, 2017 to provide a conglomerate of resolutions and decrees that promote the digital migration of the different analogue television channels and subsequently a series of provisions were established for operating licensing for 15 more years for each current operator, for free. The channels companies have a new digitalblackout period for the 3 main cities until November 2021 and others with less coverage until November 2025. The guide resulting from this work has already been applied and its contribution to all other channels is expected.
Dissertations / Theses on the topic "Migrations – Guinée"
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Barry, Idrissa. "Migrations, organisations de la société civile et développement en Guinée." Paris, EHESS, 2011. http://www.theses.fr/2011EHES0153.
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L'objectif principal de l'étude est de mesurer l'impact de la migration sur le développement socio-économique des populations et des familles de migrants à travers les transferts d'argent et de matériels et, les projets d'intérêts communautaires. Comme indicateurs, nous nous sommes basés sur les objectifs de développement de la Guinée, inscrits dans le Document stratégique de réduction de la pauvreté (DSRP). L'apport des migrants varie suivant leur statut (étudiants, résidents permanents, cadres, femmes. . . ). De façon générale, les apports sont généralement constitués de dépenses domestiques (scolarité, immobiliers, entretiens. . . ). Mais si cette manne est une source de revenus essentielle pour les familles des migrants, le caractère volatile et improductif des investissements amène à relativiser son rôle dans la création de richesses, d'emplois et de croissance économique pour la Guinée. Toutes fois, les associations jouent un rôle de développement communautaire -même de façon faible -par la réalisation des infrastructures d'intérêts communautaires (écoles, centres de santé, forages, désenclavement. . . . ) à travers leurs représentations locales, parfois en collaboration avec les institutions internationales de développement.
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Dougouno, Mohamed. "Les enjeux de la migration de retour en Guinée : les expériences non-retour et de retour de migrants via les programmes de retour « volontaire »." Electronic Thesis or Diss., Paris, EHESS, 2024. http://www.theses.fr/2024EHES0004.
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La Guinée a une tradition migratoire affirmée. Pendant la période coloniale et au lendemain de son indépendance, elle a fourni des travailleurs saisonniers au Sénégal et à la Côte d'Ivoire. Des décennis après, ces dynamiques de mobilité se poursuivent. En 2015, les Nations Unies ont dénombré 426 941 migrants guinéens à travers le monde. Si ces flux sont principalement orientés vers les pays d'Afrique de l'Ouest (74%), ils tendent à épouser d'autres destinations. Les routes de l'Europe via le Sahel et l'Afrique du Nord recrutent de plus en plus de candidats. Selon les données de Frontex citées par Petit et Baldé (2017), le nombre de Guinéens entrés « irrégulièrement » en Europe est passé de 47 en 2009 à 14 708 en 2016. En 2021, les ressortissants guinéens comptaient parmi les premiers demandeurs d’asile en Europe (cinquièmes en France et 15èmes dans toute l’Europe). Ces mouvements de départ sont doublés d’importants flux de retour. Entre janvier 2017 et septembre 2022, l’Organisation internationale pour les migrations (OIM) a facilité le retour de 29 410 Guinéens, faisant de la Guinée le premier pays de retour en Afrique subsaharienne. L’importance prise par les migrations guinéennes contraste avec le faible intérêt des chercheurs pour le sujet. Dit autrement, les mobilités des ressortissants guinéens restent à jour peu documentées. Cette thèse vise à contribuer à combler ce manque. Elle tente de comprendre les fondements des décisions de ces migrants. Pour ce faire, elle questionne différents moments de leurs expériences : l’émigration, le parcours dans les pays de transit, l’immigration en Europe, le retour et la réintégration en Guinée. Pour appréhender ces problèmes de recherche, une méthodologie de type qualitatif a été convoquée. L’entretien semi-directif a été le principal outil de collecte de données. Des entrevues individuelles ont ainsi été réalisées avec des migrants en situation « irrégulière » en Europe (France et Belgique), des migrants de retour en Guinée et des informateurs issus des communautés de retour. Outre l’entretien, la comparaison a été mobilisée pour suivre l’évolution des dynamiques migratoires en Afrique à travers la mise en perspective des migrations guinéennes au Sénégal et celles burkinabè en Côte d’Ivoire. La démarche comparative a aussi permis de comprendre les approches de réintégration proposées aux migrants retournés. Sur le plan théorique, un cadre d’analyse construit autour de la théorie néoclassique (Approche micro) et de la théorie des choix rationnels de Boudon, a permis d’interpréter les décisions des Guinéens dans différents contextes migratoiresGuinea has a long tradition of migration. During the colonial period and in the aftermath of independence, it supplied seasonal workers to Senegal and Côte d'Ivoire. Decades later, these mobility dynamics continue. In 2015, the United Nations counted 426,941 Guinean migrants worldwide. While these flows are mainly directed towards West African countries (74%), they tend to espouse other destinations. The routes to Europe via the Sahel and North Africa are recruiting more and more candidates. According to Frontex data cited by Petit and Baldé (2017), the number of Guineans entering Europe "irregularly" rose from 47 in 2009 to 14,708 in 2016. By 2021, Guinean nationals would be among the top asylum seekers in Europe (fifth in France and 15th in the whole of Europe). These departures are coupled with significant return flows. Between January 2017 and September 2022, the International Organization for Migration (IOM) facilitated the return of 29,410 Guineans, making Guinea the leading country of return in sub-Saharan Africa. The importance of Guinean migration contrasts with the low level of interest in the subject among researchers. In other words, the mobility of Guinean nationals remains poorly documented to date. This thesis aims to help fill this gap. It seeks to understand the basis of these migrants' decisions. At this regard, it examines different moments in their experiences: emigration, the journey in transit countries, immigration to Europe, return and reintegration in Guinea. A qualitative methodology was used to address these research issues. Semi-structured interviews were used as the main data collection tool. Individual interviews were conducted with "irregular" migrants in Europe (France and Belgium), returnees in Guinea and informants from the returnee communities. In addition to the interviews, the comparative approach was used to track the evolution of migration dynamics in Africa, by putting Guinean migration to Senegal and Burkina Faso migration to Côte d'Ivoire into perspective. The comparative approach also enabled us to understand the reintegration approaches proposed to returning migrants. Theoretically, an analytical framework built around neoclassical theory (micro approach) and Boudon's theory of rational choice was used to interpret Guineans' decisions in different migration contexts
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Simon-Loriere, Hélène. "Conditions de vie et projets migratoires des réfugiés libériens à Conakry (Guinée) et Accra (Ghana)." Phd thesis, Université de Poitiers, 2013. http://tel.archives-ouvertes.fr/tel-00959961.
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Cette thèse de géographie s'est intéressée à la situation en 2008-2009 des réfugiés libériens dans deux capitales d'Afrique de l'Ouest, Conakry en Guinée et Accra au Ghana. À l'issue du conflit au Libéria, elle pose la question de l'avenir de ces réfugiés urbains dans ces deux pays proches du Libéria où ils avaient trouvé refuge entre 1990 et 2003. Inscrite dans le champ des Forced Migration Studies, elle interroge leurs conditions de vie et leurs projets migratoires : comptaient-ils rentrer au Libéria, rester dans ces pays d'asile ou bien partir pour d'autres destinations ? Leurs expériences de migration forcée sont replacées dans les contextes du conflit libérien et de l'accueil dans ces deux pays, puis présentées par la restitution de leurs parcours d'exil dans les pays de la Mano River. À travers la répartition géographique de ces réfugiés libériens, marquée par l'absence de camp à Conakry et la présence de celui de Buduburam en périphérie d'Accra, et à travers leurs modes de subsistance pour survivre et s'organiser dans chaque capitale, les processus de reterritorialisation sont interrogés. Enfin, la trilogie des " solutions durables " proposée par le HCR - rapatriement volontaire, intégration locale, réinstallation - est revisitée au prisme des tactiques migratoires post-conflit de ces réfugiés.
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Reveyrand-Coulon, Odile. "Strategies individuelles ou contraintes collectives. Approche psychologique et anthropologique de la migration des bassari (senegal oriental) a dakar." Toulouse 2, 1989. http://www.theses.fr/1989TOU20009.
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L'observation porte sur les bassari qui migrent d'une societe villageoise "traditionnelle" (animiste, en economie d'autosubsistance, clanique, a masques, a classes d'age, acephale. . ) vers dakar (urbanisee, pluriethnique islamisee, occidentalisee. . . ). Ce travail etudie, a partir de l'observation participante, d'entretiens, de passations de tests de rorschach, les modes psychologiques d'adaptation de la personne bassari en situation de migration. Il degage les formes d'acculturation et les moyens dont dispose a priori, ou que genere a posteriori, la personne en une telle position. Cette etude pose le probleme du devenir de l'identite personnelle et de l'identite culturelle. Elle analyse le fonctionnement psychologique specifique d'individus inseres originellement dans une culture a "vocation" collective et leur adaptation a un systeme individualiste, aboutissant a une "identite elargie". Le texte repere les representations ethniques, les enjeux interrelationnels dans le groupe de migrants, les manieres dont le pouvoir est redistribue, dont la famille est maintenue et l'echec a constituer une association. L'ensemble de la these montre que ne migre pas n'importe qui et que la migration est une tentative de resolution d'un conflitThis study deals with the bassari who migrate from a traditional and village oriented society (organized according the following structures: animis, self subsistence economy, clans, masks, age-grades, acephalous system of authority) to dakar (synonymn of urbanization, ethnic pluralism, islamization, westernization). This analysis is based on participating observation, interviews, rorschach projective tests, and investigates the psychological modes of adaptation of the bassari's person in the context of migration. This research reveals the form of acculturation and the means which are a priori at the disposal of the person in this situation, or are generated by it. This work rises the problem of the future of personal and cultural identity of the migrant. It analyses the specific way in which operates the psychology of individuals who move from a collective oriented culture to a more individualistic one. The dissertation looks at the ethnic representations and the system of interrelationships which are at stake in the group of migrants (family maintained, failure of association). On the whole it appears that anybody among the bassari don't migrate, and migration is an attempt to solve personal conflicts
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Có, João Ribeiro Butiam. "A Mobilidade Internacional dos Quadros Africanos : Diáspora Qualificada, Profissionais da Área de Saúde e Redes Transnacionais de Desenvolvimento na Guiné-Bissau." Doctoral thesis, Instituto Superior de Economia e Gestão, 2012. http://hdl.handle.net/10400.5/4649.
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Doutoramento em Sociologia Económica e das OrganizaçõesAs migrações, através das dinâmicas de incorporação e transnacionalismo das suas redes, têm tido um contributo assinalável nas civilizações humanas, bem como no desenvolvimento social, económico e político global. A dinâmica da mobilidade humana é hoje um fenómeno muito presente nos estudos das ciências sociais e humanas, em específico da sociologia económica. O trabalho aqui apresentado visa analisar a mobilidade internacional dos quadros, em particular dos profissionais da área de saúde, e o papel das redes transnacionais no desenvolvimento da Guiné-Bissau, tendo como elementos explicativos os determinantes socioculturais implícitos na organização e acções da diáspora guineense qualificada. O crescimento do volume da diáspora guineense qualificada tem sido acompanhado pelas redes (de incorporação e transnacionais) deste grupo migrante. Estas redes têm conhecido algumas dificuldades no cumprimento dos seus objectivos, relativos à implementação de programas e políticas de migração e desenvolvimento. Isto acontece, por um lado, devido à instabilidade política, social e institucional do país de origem. Por outro, devido a determinantes de natureza sociocultural, como é o caso do capital social e organizativo das redes associativas e dos habitus culturels dos seus membros. Por consequência, a Guiné-Bissau faz parte dos países africanos que menos beneficia das oportunidades dos programas de inversão da fuga dos cérebros. Não obstante, possui, depois de Moçambique, a maior taxa de emigração relativa de médicos emigrados nos países da OCDE - sendo que a maior parte reside em Portugal estimada em 150% dos que trabalham actualmente no serviço nacional de saúde da Guiné-Bissau. Durante a nossa pesquisa, a maior parte dos médicos inquiridos em Portugal expressou a vontade de colaborar no desenvolvimento do sector da saúde guineense, através de programas que lhes permitam manter as suas residências e carteiras profissionais no país de acolhimento. Devido a perdas cada vez maiores de profissionais da área de saúde, em particular de médicos, na Guiné-Bissau, estima-se uma necessidade de formação local, nos próximos cinco anos, de pelo menos 51 médicos especializados. Dadas as más condições do sistema nacional de saúde na Guiné-Bissau - um dos principais factores de repulsão de profissionais médicos -, torna-se indispensável que o Estado guineense estabeleça mecanismos de reconhecimento e de ligação institucional com as redes da diáspora guineense qualificada, em particular dos profissionais da saúde, de modo a permitir uma participação e operacionalização de projectos de apoio ao desenvolvimento da Guiné-Bissau, em específico na área da saúde.
International migration is having a profound impact on human civilizations, as well as on global social, economic and political development, as a consequence of the dynamics of incorporation and transnationalism of migrant networks. Human mobility is today a theme deserving widespread research in human and social sciences, particularly in economic sociology. The current work aims to study the international mobility of highly skilled workers, particularly in the health sector, as well as the role of transnational networks on the development of Guinea-Bissau. The main explanatory factors under analysis are the social and cultural determinants underlying the organization and actions of the skilled diaspora. The increase of the skilled diaspora from Guinea-Bissau has been accompanied by the reinforcement of networks (of incorporation and transnational) from this migrant group. These networks have faced significant obstacles in the pursuing of their objectives, regarding the accomplishment of migration and development programs and policies. The main reasons for this are, on the one hand, the political, social and institutional instability of the origin country. On the other hand, they consist of social and cultural determinants, such as the social and organizational capital of the immigrants' associations and the habitus culturels of their members. An outcome is the fact that Guinea-Bissau is one of the African countries which benefits the least from programs of reverse brain drain. However, the country possesses, after Mozambique, the highest relative emigration rate of medical doctors to OECD countries - the majority of whom live in Portugal. That rate is estimated at 150% of the total number of medical doctors currently employed in Guinea-Bissau's national health service. In our own fieldwork, the majority of the medical doctors surveyed in Portugal expressed a will to collaborate with the development of Guinea-Bissau's health sector, supported by programs allowing them to maintain their residence and professional license in Portugal. Given the recurrent lost of health sector professionals, particularly medical doctors, from Guinea-Bissau, a local need for the training of at least 51 specialized doctors is forecast for the next five years. Taking into account the adverse conditions of the health national system in the country - one of the factors explaining the departure of professionals -, there is a need for the state to develop recognition mechanisms and institutional connections with the skilled diaspora's networks. This appears a crucial condition for allowing stronger participation and operationalization of development projects in Guinea-Bissau, particularly in the health sector.
Les migrations humaines contribuent depuis toujours au développement de l'humanité. Les diffusions culturelles et techniques qui les accompagnent enrichissent les civilisations et les communautés humaines d'accueil. Grâce aux moyens de communications d'aujourd'hui les processus d'intégration se combinent au déploiement de réseaux multinationaux toujours plus importants. C'est pourquoi les dynamiques de mobilité humaine sont aujourd'hui étudiées par les sciences sociales et humaines et plus particulièrement par la sociologie économique. Je considérerai dans ce travail un cas de mobilité internationale de cadres africains à partir de l'exemple des professionnels bissau-guinéens de la santé et des réseaux transnationaux de développement qu'ils installent. La formation d'une diaspora bissau-guinéenne de professionnels qualifiés a en effet donné lieu à la création de réseaux tant d'intégration dans le pays d'accueil que transnationaux qui ont vite voulu participer au développement du pays d'origine. Toutefois, les programmes mises en œuvre au sein de ces réseaux n'ont pas atteint leurs objectifs. D'une part, en raison de l'instabilité politique, sociale et institutionnelle que connait le pays d'origine. De l'autre, en raison de déterminants socioculturels dont le capital social et les habitus culturels des membres des réseaux. La Guinée-Bissau est par conséquent l'un des pays africains ayant le moins bénéficié d'opportunités telles que la mise en place de programmes visant à stopper la fuite des cerveaux africains. A l'exception du Mozambique, le pays a le taux le plus élevé d'émigration de médecins vers les pays riches de l'Organisation de Coopération et de Développement Economique. L'émigration dans le service national de la santé est, aujourd'hui, estimée à 150%. Notre enquête témoigne du fait que la plupart des médecins bissau-guinéens installés au Portugal expriment néanmoins une forte volonté de coopérer au développement du secteur de la santé de leur pays d'origine si leur était possible de conserver leurs cartes professionnelles du pays hôte. La fuite grandissante des cerveaux bissau-guinéens et en particulier des médecins, creuse le déficit. Le besoin de formation locale est estimé à 51 spécialistes au minimum dans les cinq prochaines années. Ces faits démontrent la nécessité pour l'Etat bissau-guinéen de mettre en place des mécanismes de reconnaissance et de liaison institutionnelle avec les réseaux qualifiés de la diaspora bissau-guinéenne et en particulier avec ceux constitué par les professionnels de la santé - ce qui permettrait leur participation à des projets de développement et en particulier à ceux concernant le domaine de la santé.
Instituto Português de Apoio Ao Desenvolvimento; CEDEAO-ECOWAS; Fundação Calouste Gulbenkian; SOCIUS
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Bayo, Soumahila. "Microcrédit et genre dans un contexte de pauvreté en haute Guinée." Thesis, Toulouse 2, 2017. http://www.theses.fr/2017TOU20126/document.
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Cette thèse a pour objet la compréhension des mécanismes de diffusion de la microfinance en relation avec les questions de genre en Haute-Guinée. En effet, l’examen des rapports sociaux en Haute-Guinée laisse entrevoir des disparités de genre au détriment des femmes. Majoritairement elles touchées par de nombreuses inégalités d’ordre socio-économique, culturel et politique : elles sont peu ou pas du tout impliquées dans le processus de prise de décision ; leur niveau d’instruction et de formation sont faibles par rapport à ceux des hommes ; elles sont exclues du contrôle des ressources productives et économiques (terres, arbres fruitiers, mines, pêche…). Cet état de fait a pour conséquence la dévalorisation de leur statut social, la charge considérable du travail domestique et surtout la paupérisation généralisée des femmes. Face à ces réalités, certaines femmes s’inscrivent dans des logiques d’emprunt de microcrédits pour démarrer, renforcer ou encore diversifier les activités génératrices de revenus dans les secteurs du commerce, de l’artisanat et de l’agriculture. C’est dans la perspective d’approfondir ce défi que cette thèse tente d’analyser les effets de la microfinance sur la vie des femmes de cette région de la Guinée.A partir d’une approche méthodologique essentiellement qualitative, l’examen des réalités de terrain révèle que la microfinance n’est pas une solution miracle pour lutter contre la pauvreté des femmes et les inégalités de genre. Elle peut tout aussi produire des effets inverses débouchant sur l’aggravation de leur situation économique et sociale (surendettement, pauvreté, migration, exclusion, divorce, prostitution, exposition au VIH/SIDA)The purpose of this dissertation is the understanding of the mechanisms of the development of microfinance in relation to gender issues in Upper Guinea, in the republic of Guinea. Indeed, the examination of social relations in Upper Guinea suggests gender disparities to the detriment of women. They are disproportionately affected by many socio-economic, cultural, and political inequalities: they have little or no involvement at all in the decision-making process; they have very low levels of education and training in comparison to men; they have no control over productive and economic resources (trees, fruit trees, mines, fishing, among others). This situation results in the devaluation of their social status, significant domestic workload, and above all, women’s generalized impoverishment. Confronted with this reality, some women adhere to the logic of borrowing, which is based on micro-credits in order to start, strengthen or diversify income generating activities in the trade, crafts and agriculture sectors. For the purpose of further exploring that issue, this dissertation attempts to analyze the effects of microfinance on women’s life in this region of Guinea.Using a methodological approach, which is primarily qualitative, the examination of field realities shows that microfinance is not a miracle solution to fight poverty among women and gender inequalities. It may just as well produce opposite effects resulting in the worsening of their economic and social situation (over-indebtedness, poverty, migration, exclusion, divorce, prostitution, exposure to HIV/AIDS)
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Diop, Amadou Moustapha. "Société manjak et migration /." [S.l.] : A. M. Diop, 1996. http://catalogue.bnf.fr/ark:/12148/cb370213642.
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Texte remanié de: Th. 3e cycle--Paris--EHSS. Titre de soutenance : Tradition et adaptation dans un réseau de migration sénégalais : la communauté manjak de France.Bibliogr. p. 192-201. Glossaire.
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Diallo, Mamadou Aliou. "Les étudiants Africains en France : le cas des étudiants guinéens dans les universités de la région parisienne." Electronic Thesis or Diss., Paris 8, 2021. http://www.theses.fr/2021PA080052.
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Bénéficiaires de la démocratisation quantitative sélective orchestrée par Campus France, les étudiants guinéens quittent leur pays pour poursuivre des études supérieures en France dans l’espoir d’avoir un diplôme international pouvant déboucher sur une embauche au niveau national et international. Je cherche à étudier la présence de ces étudiants dans les différentes universités françaises, les démarches qu’ils mènent pour venir en France, leurs motivations, la catégorie socio-professionnelle et le niveau d’études de leurs parents, le financement du voyage et des études, leurs conditions de vie et d’études, leurs intentions de retour une fois les études terminées en France…Les responsables politiques français, dans le cadre de l’État, définissent les critères d’immigration des étudiants africains sur le territoire : une façon de contrôler celle-ci. Cette dernière est donc une pensée de l’État, le seul acteur légalement institué pour monopoliser la question de l’immigration. Au cours du temps, selon les contextes, les politiques se sont axées sur la construction, la déconstruction et la reconstruction de modèles d’accueil de ces étudiants pour mieux orienter l’immigration sur le territoire français.Les étudiants, quant à eux, cherchent à atteindre leurs objectifs, s’adaptent au système universitaire et valident leurs semestres en ne transgressant pas les textes juridiques de l’État.La dualité des objectifs (ceux de l’État, ceux des étudiants) va dans le sens d’une migration pour les études en France. Elle vient rappeler la relation d’interdépendance entre les différents acteurs engagés dans ce processusAfrican students in France. The case of Guinean students in universities of Paris region Benefiting by the selective quantitative democratization set up by Campus France, Guinean students leave their country to continue their studies in France with the hope of getting an international degree/diploma that could lead to national or international employment.I am attemping to study the presence of students in various French universities, the administrative procedures they follow to come to France, their motivations, their socio-professional category and the level of study of their parents, the financing of their trip and studies, the conditions of their life and studies and also their intentions to return after their studies have been completed here in France.French politicians, in the context of the state, fixe the criteria for immigration of African students to the territory ; it is a way to control immigration. Therefore it represents a doctrine thought by the state, the only legally constituted actor to monopolise the issue of immigration. In the length of time, depending on the contexts, politicians focused on the construction, deconstruction and reconstruction of the models of reception of those students in order to improve direct immigration to French territory.Students seek to achieve their goals, adapt to the university system and validate their semester by abiding by the legal texts of the State.The duality of the objectives, those of the state and those of the students, is an asset for the academic migration in France. It reminds us of the relation of interdependence between the different actors involved in this process
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MacArthur, Shona. "Bubbles guide migrating smolts around hydropower plants." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-160490.
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The development of hydroelectric power production and the damming of water courses that ensues causes a threat to the migration patterns of Atlantic salmon (Salmo salar), by altering their habitat and compromising river connectivity. Because the species’ survival heavily depends on the completion of their migration between rivers and oceans, the design of guidance structures that promote successful passages around dams is a critical goal. Physical structures have been used to steer downwards-migrating smolts through safe fishways but they have not always proven effective, both from an ecological and economical perspective. In this study, the potential of bubbles in guiding salmon trajectories around a hydropower dam was tested as an alternative to existing guiding systems. Here the hypotheses were: i) bubbles guide downstream-migrating smolts around dams; ii) the reaction of smolts to a bubble barrier is linked to their individual boldness; iii) bubbles have varying effects on different school sizes. The first and third hypotheses were tested in the field, by recording sonar footage at the entrance of a fishway, downstream of a bubble barrier. The second hypothesis was evaluated by conducting a scototaxis experiment and an assessment of the reaction of young salmon to bubbles in the laboratory. My analysis of the fish abundance data collected in the river confirmed the first and third hypotheses. In the field, the presence of a predator (Esox lucius) was revealed to be a more influential factor than bubbles in regulating the number of smolts steered towards the fishway, indicating that predators generated a larger anxiety-like response in smolts than bubbles. In the controlled laboratory setting, there was no significant correlation between anxiety-like behaviour and reaction to bubbles and the second hypothesis did not appear to be valid. Therefore, the cause of avoidance of the barrier remains unclear, but bubble barriers seem to be an efficient and cost-effective structure for guiding downstream-migrating salmon smolts.
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Abreu, Alexandre José Germano de. "Migration and development in contemporary Guinea-Bissau : a political economy approach." Thesis, SOAS, University of London, 2012. http://eprints.soas.ac.uk/14243/.
Full textBooks on the topic "Migrations – Guinée"
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Gessain, Monique. Coniagui: Guinée, Sénégal et Gambie, 1904-2004 : l'histoire d'une diaspora. Saint-Maur-des-Fossés: Sépia, 2004.
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Réseau migrations et urbanisation en Afrique de l'ouest. Enquête sur les migrations et l'urbanisation en Guinée (EMUG) 1992-1993: Rapport national descriptif. Bamako, Mali: CERPOD, 1997.
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Kone, Sixeau Daouda. Le peuplement ancien en Basse-Guinée: XIIe-XIXe siècles. Paris: L'Harmattan, 2015.
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Andrew, Strathern, Stürzenhofecker G, and Association for Social Anthropology in Oceania. Meetings., eds. Migration and transformations: Regional perspectives on New Guinea. Pittsburgh: University of Pittsburgh Press, 1994.
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Antchapramann, Yephindet. Les Baga: Organisation sociopolitique et culturelle d'hier et d'aujourd'hui. Paris: L'Harmattan, 2021.
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Migrations, ONG et développement en Guinée. Paris: L'Harmattan, 2013.
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Bassari Migrations. Taylor & Francis Group, 2019.
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Nolan, Riall W. Bassari Migrations: The Quiet Revolution. Taylor & Francis Group, 2020.
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Nolan, Riall W. Bassari Migrations: The Quiet Revolution. Taylor & Francis Group, 2019.
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Nolan, Riall W. Bassari Migrations: The Quiet Revolution. Taylor & Francis Group, 2019.
Find full textBook chapters on the topic "Migrations – Guinée"
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Katzer, Matthew, and Don Crawford. "Setup and Migration Guide." In Office 365, 121–78. Berkeley, CA: Apress, 2013. http://dx.doi.org/10.1007/978-1-4302-6527-6_4.
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Smith, Stanley K., Jeff Tayman, and David A. Swanson. "Migration." In A Practitioner's Guide to State and Local Population Projections, 103–53. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7551-0_6.
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Lloyd, Jeremy. "Migration Strategies." In Infrastructure Leader’s Guide to Google Cloud, 99–105. Berkeley, CA: Apress, 2022. http://dx.doi.org/10.1007/978-1-4842-8820-7_8.
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O’Shea, Daniel J. "Labor Migration." In Mental Health Practitioner's Guide to HIV/AIDS, 283–85. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5283-6_55.
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Zhang, Preston. "MySQL Database Migration." In Practical Guide to Large Database Migration, 75–108. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2019] |: CRC Press, 2019. http://dx.doi.org/10.1201/9780429422621-4.
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Zhang, Preston. "Oracle Database Migration." In Practical Guide to Large Database Migration, 131–68. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2019] |: CRC Press, 2019. http://dx.doi.org/10.1201/9780429422621-6.
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Oso, Laura, Paweł Kaczmarczyk, and Justyna Salamońska. "Labour Migration." In IMISCOE Research Series, 117–35. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92377-8_7.
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AbstractThis chapter will focus on labour migration, that is the movement of persons with the aim of employment or income-bringing activities (e.g., entrepreneurship), developing the topic which was also touched upon in Chap. 10.1007/978-3-030-92377-8_3 on conceptual understanding of migration drivers. Research on labour migration has developed across various disciplines (e.g., sociology, anthropology, and geography), but most prominently in economics. It has resulted in a range of theoretical frameworks, starting with neoclassical economic theories and advancing through the New Economics of Labour Migration (NELM), dual labour market theory, and social network theory, to more recent transnational approaches or theories dedicated to particular forms of labour migration. These diverse approaches offer insights into labour migration on macro-, meso- and micro-levels. Although a dichotomy based on skills (high-skilled vs. low-skilled workers) can be seen as controversial or misleading as a division between workers representing these two types of skills is often vague or difficult to determine, the distinction does reflect recent debates on labour migration. Thus, a high−/low-skills dichotomy serves as a guide to the structure of this chapter.
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Rodney, Walter. "African slavery and other forms of social oppression on the Upper Guinea Coast in the context of the Atlantic slave trade." In Forced Migration, 61–73. London: Routledge, 2022. http://dx.doi.org/10.4324/9781003317869-2.
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Zhang, Preston. "Introduction to Database Migration." In Practical Guide to Large Database Migration, 1–11. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2019] |: CRC Press, 2019. http://dx.doi.org/10.1201/9780429422621-1.
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Zhang, Preston. "SQL Server Database Migration." In Practical Guide to Large Database Migration, 12–42. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2019] |: CRC Press, 2019. http://dx.doi.org/10.1201/9780429422621-2.
Full textConference papers on the topic "Migrations – Guinée"
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Kovalick, Al. "A Cloudspotter's Guide to Migration." In SMPTE Technical Conference. IEEE, 2012. http://dx.doi.org/10.5594/m001462.
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Canales, Joseph A. "Direct hydrocarbon migration indicator, a venting feature in equatorial guinea." In SEG Technical Program Expanded Abstracts 2001. Society of Exploration Geophysicists, 2001. http://dx.doi.org/10.1190/1.1816713.
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Han, Xiaosong, Chengyang Zhou, Yanchun Liang, and Renchu Guan. "Migration: An Efficient Explorer Operator to Guide Swarm Evolution." In 2023 IEEE International Conference on Medical Artificial Intelligence (MedAI). IEEE, 2023. http://dx.doi.org/10.1109/medai59581.2023.00036.
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Shah, Hardik. "Advancing Web Accessibility: A Guide to Transitioning Design Systems from WCAG 2.0 to WCAG 2.1." In 13th International Conference on Artificial Intelligence, Soft Computing and Applications. Academy & Industry Research Collaboration Center, 2023. http://dx.doi.org/10.5121/csit.2023.132218.
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This research focuses on the critical process of upgrading a Design System from Web Content Accessibility Guidelines (WCAG) 2.0 to WCAG 2.1, which is an essential step in enhancing web accessibility. It emphasizes the importance of staying up to date on increasing accessibility requirements, as well as the critical function of Design Systems in supporting inclusion in digital environments. The article lays out a complete strategy for meeting WCAG 2.1 compliance. Assessment, strategic planning, implementation, and testing are all part of this strategy. The need for collaboration and user involvement is emphasized as critical strategies and best practices for a successful migration journey. In addition, the article digs into migration barriers and discusses significant lessons acquired, offering a realistic view of the intricacies of this transforming road. Finally, it is a practical guide and a necessary resource for organizations committed to accessible and user-centered design. The document provides them with the knowledge and resources they need to navigate the changing world of web accessibility properly.
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Babazzi, Giulia, Tommaso Bacci, Alessio Picchi, Bruno Facchini, and Simone Cubeda. "Film Cooling and Cold Streaks Tracking on a Fully Cooled Nozzle Guide Vane Under Representative Combustor Outflow Conditions." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-81360.
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Abstract The pronounced non uniform temperature distribution in the core engine flow path is a recurring problem of gas turbine engine design process. Specifically, turbine entry conditions are usually characterised by severe temperature distortions, often referred to as hot and cold streaks, ascribed to combustor burners and combustor liners cooling systems. Temperature distortions remain an issue even at the exit section of the nozzle guide vane (NGV), where additional cold streaks coming from the vane film cooling system are injected into the flow. A precise knowledge of thermal field and its evolution is thus essential to mitigate their impact on turbine performance and lifetime. Various studies focus on the description of streaks migration through a direct investigation of the thermal field, providing an effective evaluation of the global phenomenon. As a deeper understanding is often required, experimental techniques based on the detection of tracer gases can be successfully adopted. In this study, a realistic combustor outlet swirl profile was imposed on a fully cooled NGV cascade to analyse both film-cooling behaviour and cold streaks migration and redirection. A concentration probe based on the fluorescence behaviour of an oxygen sensor, fully characterised in a previous work, was here employed to track the position of the film cooling flows at the NGV cascade exit plane, while the adiabatic film-cooling effectiveness was evaluated on the NGV surfaces employing the Pressure Sensitive Paint (PSP) technique. Overall, the swirling structure strongly affect both the film-cooling behaviour and cold streaks migration through and downstream the vane. The importance of examining the unsteady aspect is also highlighted to better estimate actual components operating temperatures. A global understanding of the occurring phenomena is therefore provided, as well as significant pieces of information that can be extremely useful for the design phases of both the NGV and the following rotor cascade.
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Raab, M. D., J. Swift, and D. E. Discher. "Matrices engineered with gradients in rigidity guide stem cell migration and polarize the cytoskeleton." In 2012 38th Annual Northeast Bioengineering Conference (NEBEC). IEEE, 2012. http://dx.doi.org/10.1109/nebc.2012.6207085.
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Wood, Jonathan G. M. "Predicting Deterioration for Design and Maintenance: AAR and Chlorides." In IABSE Conference, Copenhagen 2018: Engineering the Past, to Meet the Needs of the Future. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/copenhagen.2018.352.
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In the 1980s engineers faced major challenges from severe concrete deterioration from AAR (Alkali Aggregate Reaction) and from corrosion. The construction of the Channel and Storebaelt Tunnels required major improvements in specifying concrete to combat both these problems. Anglo-Danish cooperation of consultants and research centres led to innovations in cementitious materials, assessment of aggregates, the testing of materials and predicting deterioration. Since then RILEM has provided an international framework to guide developments on AAR diagnosis, appraisal, testing and specification. Quantitative durability design remains in its infancy. Rapid testing data do not predict migration over many decades. Fick’s law models neglect the physical and chemical processes of chloride migration. Data from old structures is needed for calibrating models and validating theories.
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Jiménez-Castillo, David, Antonia Estrella-Ramón, M. Ángeles Iniesta-Bonillo, and Raquel Sánchez-Fernández. "MOVING TO FLIPPED LEARNING: A DYNAMIC FRAMEWORK TO GUIDE INSTRUCTORS’ MIGRATION PROCESSES IN HIGHER EDUCATION." In International Conference on Education and New Learning Technologies. IATED, 2017. http://dx.doi.org/10.21125/edulearn.2017.0799.
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van de Noort, Michael, Alexander V. Murray, and Peter T. Ireland. "Low Order Heat & Mass Flow Network Modelling for Quasi-Transpiration Cooling Systems." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-81780.
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Abstract Quasi-transpiration cooling schemes such as Double-Wall Effusion Cooling allow the Nozzle Guide Vanes of High Pressure Turbines in modern aeroengines to experience high heat loads whilst maintaining acceptable temperatures. The combination of impingement, pin-fin and effusion cooling in such schemes produces a high convective cooling efficiency, but this is accompanied by large pressure losses that increase vulnerability to coolant migration toward low pressure regions. This can have severely detrimental effects on cooling performance as effusion holes around the Leading Edge can be starved of coolant, producing no local film cooling protection. This paper presents a Low Order Model (LOM) which rapidly produces pressure, temperature, mass and heat flow distributions throughout Double-Wall Effusion Cooling Schemes, developed from a previously presented Mass Flow Network LOM. These can be found for a variety of flow and geometric conditions, allowing fast analysis of cooling designs. Experiments were conducted using a steady-state facility, from which results were used to validate the new LOM to a satisfactory standard. Using specifically derived dimensionless groups for coolant migration, results from the LOM demonstrate the effect of heat transfer on it as well as the effects of coolant migration on the cooling performance, highlighting design guidelines to reduce such effects and to optimise the component life.
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Khalatov, Artem, Nick Syred, Sergei Khalatov, and Philip Bowen. "Effect of Secondary Flow on Heat Transfer Over a Guide Vane Suction Side." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30197.
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An accurate design of a guide vane has become a major issue in gas turbine engineering since secondary flow in vane cascade has a significant effect on the end wall and airfoil suction surfaces. Heat transfer and average flow measurements were performed in a linear guide vane cascade consisting of five gas turbine vanes. All measurements were taken on the suction surface of the middle (third) airfoil. The height-to-pitch ratio H/S was varied from 1.0 to 0.17, the inlet boundary layer thickness δin was either 2 mm or 10 mm. The vortex structures influence the average flow parameters, the laminar-to-turbulence transition, and the local heat transfer. This is especially pronounced in the area close to the end wall area. The inlet flow temperature non-uniformity has no influence on the heat transfer, however local flow temperature ‘spikes’ were registered at x = 0.6 due to the flow enthalpy migration in the span-wise direction. A few useful correlations are suggested as a result of the experimental data processing.
Reports on the topic "Migrations – Guinée"
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Whitaker, Stephan D. Understanding Migration Trends to Prepare for the Post-Pandemic Future. Federal Reserve Bank of Cleveland, August 2023. http://dx.doi.org/10.26509/frbc-rpr-20230801.
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As the country has emerged from the pandemic, the places where people have traditionally lived and spent their money have shifted. Considering how our region has fared relative to the rest of the nation, this analysis reveals the region’s strengths and weaknesses and points to seven key insights that should guide policy decisions as we prepare for the post-pandemic years.
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Collins, William. The Great Migration of Black Americans from the US South: A Guide and Interpretation. Cambridge, MA: National Bureau of Economic Research, May 2020. http://dx.doi.org/10.3386/w27268.
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Kingston, A. W., O. H. Ardakani, and R A Stern. Tracing the subsurface sulfur cycle using isotopic and elemental fingerprinting: from the micro to the macro scale. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329789.
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Hydrogen sulfide (H2S) is a toxic and corrosive gas that commonly occurs in deeply buried sedimentary systems. Understanding its distribution is paramount to creating safe and effective models of H2S occurrence aiding in the identification of high-risk areas. Characterizing subsurface sulfur sources and H2S formation pathways would enhance these models leading to more accurate predictions of potential high H2S regions. However, gaps remain in our understanding of the dominant formation processes and migration pathways of key ingredients for H2S production in the Lower Triassic Montney Formation of the Western Canada Sedimentary Basin (WCSB). Essential to this is assessing the reactants necessary for H2S production, potential pathways for fluid migration, diagenetic history, and changes in redox conditions through time. The Montney Formation has undergone several phases of diagenesis related to post-depositional alteration and multiple cycles of tectonic burial and uplift. Early chemical alteration includes dolomitization and, in some cases, microbial reduction of porewater sulfate to sulfide that occurred prior to significant burial (Davies et al., 1997; Vaisblat et al., 2021; Liseroudi et al., 2020, 2021). The most recent tectonic-related burial during the Laramide Orogeny resulted in burial depths in excess of 3-5 km (Ness, 2001; Ducros et al., 2017) leading to significant thermal and barometric alteration. Associated with this orogenic activity was the reactivation of underlying faults (O'Connell et al., 1990) and development of fractures especially near the deformation front. These fractures provide conduits for fluid migration into the Montney that combined with heat and pressure resulting in hydrocarbon generation, migration, and development of overpressure, notably in the western margin of the basin. In addition, high temperatures resulted in thermochemical sulfate reduction (TSR) leading to the formation of H2S and subsequently pyrite. We present an interpretation of the Montney subsurface sulfur cycle through the use of petrography, micro- and macro-scale geochemical analysis (isotopic and elemental) to illustrate the complexity of this system. This work relies heavily on previous studies within and outside our research group and incorporates new analytical techniques to expand the toolbox. We aim to guide future research directions and activities by addressing issues related to sampling and data quality issues, analytical approaches, and highlight knowledge gaps.
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Savannah River Site computing architecture migration guide. Office of Scientific and Technical Information (OSTI), July 1991. http://dx.doi.org/10.2172/10157000.
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Savannah River Site computing architecture migration guide. Office of Scientific and Technical Information (OSTI), July 1991. http://dx.doi.org/10.2172/5101677.
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