Relevant bibliographies by topics / Cameroon Line

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'Cameroon Line'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Cameroon Line"

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Déruelle, Bernard, Jean N'ni, and Robert Kambou. "Mount Cameroon: an active volcano of the Cameroon Line." Journal of African Earth Sciences (1983) 6, no. 2 (January 1987): 197–214. http://dx.doi.org/10.1016/0899-5362(87)90061-3.

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Nemzoue, P. N. N., N. A. K. Keutchafo, and J. P. Tchouankoue. "GEOTHERMAL DEVELOPMENT IN CAMEROON." Revista de Engenharia Térmica 19, no. 1 (September 9, 2020): 32. http://dx.doi.org/10.5380/reterm.v19i1.76428.

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Africa is currently experiencing a period of economic growth. Its population is growing rapidly and its economies grow and diversify. To be sustainable, such growth requires a large investment in the energy sector. In the case of Cameroon hydroelectric energy is the main source of electrical power whereas the analysis of the geological point of view shows that Cameroon is unique in west-northern of Africa for its active volcanic line (with the last eruption of Mount Cameroon that last erupted in 1999 and 2000) that is a favorable zone for the production of power from geothermal resources. The Cameroon Volcanic Line (CVL) is 100 km wide linear magmatic megastructure oriented N30°E that extends more than 1500 km from Pagalu Island in the Gulf of Guinea to Lake Chad. Along this active volcanic line, more than one hundred and thirty thermal springs are found with the hottest spring at Woulndé (74°C).The aim of this paper is to evaluate the importance of geothermal energy development in the Cameroon Volcanic Line through a geological investigation of areas (Mt. Cameroon and Adamawa) bearing springs with hottest temperatures. This work is a compilation of the bibliographic analysis find at the same topic of research with a source like an International reviewed article, local documents and a websites research. The absence of commitment and enthusiasm from the government is weakening the sector potentiality to be developed either by private sector investments and also foreign investors. Other applications of geothermal energy in Cameroon are also discussed.
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Kochemasov, G. G. "The Cameroon line: its regularities and relation to African rifts." Global Tectonics and Metallogeny 9 (January 1, 2007): 67–72. http://dx.doi.org/10.1127/gtm/9/2007/67.

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Barfod, D. N. "Noble Gases in the Cameroon Line." Mineralogical Magazine 62A, no. 1 (1998): 118–19. http://dx.doi.org/10.1180/minmag.1998.62a.1.62.

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Tanyileke, G. Z., M. Kusakabe, and W. C. Evans. "Chemical and isotopic characteristics of fluids along the Cameroon Volcanic Line, Cameroon." Journal of African Earth Sciences 22, no. 4 (May 1996): 433–41. http://dx.doi.org/10.1016/0899-5362(96)00025-5.

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Ubangoh, R. U., I. G. Pacca, J. B. Nyobe, J. Hell, and B. Ateba. "Petromagnetic characteristics of Cameroon Line volcanic rocks." Journal of Volcanology and Geothermal Research 142, no. 3-4 (April 2005): 225–41. http://dx.doi.org/10.1016/j.jvolgeores.2004.11.006.

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Nkouathio, D. G., J. J. Ménard, P. Wandji, and J. M. Bardintzeff. "The Tombel graben (West Cameroon): a recent monogenetic volcanic field of the Cameroon Line." Journal of African Earth Sciences 35, no. 2 (August 2002): 285–300. http://dx.doi.org/10.1016/s0899-5362(02)00031-3.

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Tabod, C. T., J. D. Fairhead, G. W. Stuart, B. Ateba, and N. Ntepe. "Seismicity of the Cameroon Volcanic Line, 1982–1990." Tectonophysics 212, no. 3-4 (October 1992): 303–20. http://dx.doi.org/10.1016/0040-1951(92)90297-j.

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Njonfang, Emmanuel, and Alexandre Nono. "Clinopyroxene from some felsic alkaline rocks of the Cameroon Line, central Africa: petrological implications." European Journal of Mineralogy 15, no. 3 (June 10, 2003): 527–42. http://dx.doi.org/10.1127/0935-1221/2003/0015-0527.

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Ngounouno Yamgouot, Fadimatou, Isaac Bertrand Gbambie Mbowou, Ismaïla Ngounouno, Azizi Abdoul Youpoungam, Isaac Daama, and Bernard Déruelle. "Insight into geochemistry of basaltic rocks from Mt Cameroon and characterization of the mantle source." International Journal of Advanced Geosciences 6, no. 2 (June 27, 2018): 151. http://dx.doi.org/10.14419/ijag.v6i1.10738.

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Alkaline volcanic activities occurred in the Mt Cameroon at the ocean-continent boundary of the Cameroon Line. It is characterized by a volcanic association of alkali basalts and hawaiites extruded during the late Miocene to Recent times. The major and trace element geochemistry of the Mt Cameroon are consistent with the fractional crystallization of olivine ± clinopyroxene ± plagioclase (± amphibole). Petrographical and mineralogical study reveals the presence of xenocryts (olivine, clinopyroxene and spinel) in Mt Cameroon basalts. Their composition are similar to xenoliths and rocks crystals and they come from cumulates formed in the upper lithospheric mantle. Mt Cameroon magmas were generated near the boundary of garnet and spinel mantle stability domains (60–75 km depth), at the base of the lithospheric mantle that the compositions of the Mt Cameroon magmas are consistent with derivation from a infralithospheric mantle that was metasomatised by carbonatite melts. Basaltic volcanism in the Mt Cameroon occurred probably as a result of minor plume activity coupled with lithospheric extension.
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Dissertations / Theses on the topic "Cameroon Line"

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Tabod, Tabod Charles. "Seismological studies of the Cameroon Volcanic Line, in West Africa." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305583.

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Nnange, Joseph Metuk. "The crustal structure of the Cameroon Volcanic Line and the Foumban Shear Zone based on gravity and aeromagnetic data." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305782.

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Tambe-Ebot, Mathias Ashu Tako. "Proposing a Theoretical GIS Model for Landslides Analysis : The Case of Mount Cameroon." Thesis, Linköpings universitet, Institutionen för datavetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-65899.

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This study presents a theoretical GIS model to investigate the relative impacts of geomorphic and environmental factors that govern the occurrence of landslides on the slopes of Mount Cameroon and its surrounding areas. The study area is located along the Cameroon Volcanic Line (CVL), a major structural feature that originates from the south Atlantic and continues into the continental landmass. The quite frequent seismic activity, geologic character, humid tropical climate and high human pressure on hill slopes are the major factors behind the occurrence of landslides in Mount Cameroon. This paper, therefore, underscores the necessity of in-depth follow-up studies concerned with landslides prevention and management based on the relevance of sufficient reliable field methods in landform geomorphology and interpretation. As much is yet to be done to acquire data for structural and surface geology, hydrology, geomorphic processes and physiography of Mount Cameroon, it is difficult at this point in time to considerably apply suitable methods using GIS that would enable identifying and delineating the landslide-prone areas. In addition, the application of environmental surface monitoring instruments will not be meaningful without a clear presentation of which areas are a cause for concern (given that the employment of any slope stability monitoring and rehabilitation efforts will be only possible after appropriate problem-area identification has been done). Consequently, based on the writer’s previous work in the Mount Cameroon area and available related literature, a methodology using GIS is proposed, which provides the capability to demonstrate how the impact of individual or collective geomorphologic site-specific factors on landslides occurrence could be justified. Considering that digital data may not be readily available, a procedure for the creation of data and analysis of themes is proposed and illustrated. The factors analysis approach in landslides analysis may be cheaper and easier to employ in Mount Cameroon and similar problem regions in developing countries (given that there may be problems of limited financial resources and available expertise in GIS technology and applications). The study underscores and recommends the necessity for a later practical implementation with the availability of adequate resources.
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Audhkhasi, Pranav. "Upper Crustal and Lithosphere-Asthenosphere Boundary Seismic Structure of 0-75 Ma old Normal Oceanic Lithosphere in the Equatorial Atlantic Ocean." Thesis, Université de Paris (2019-....), 2020. http://www.theses.fr/2020UNIP7056.

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Les études antérieures sur la croûte océanique supérieure se sont limitées à la jeune lithosphère et aux données sismiques à grand angle, qui manquent de résolution dans la croûte supérieure. La limite océanique lithosphère-asthénosphère (LAB) a été largement étudiée par des études sismologiques, mais souffre également d'une faible résolution verticale. L'expérience TransAtlantic ILAB a collecté des données de réflexion sismique multicanaux sur la lithosphère océanique âgée de 0 à 75 Ma formée sur la dorsale médio-atlantique à propagation lente dans l'océan Atlantique équatorial. L'analyse de la croûte supérieure au moyen de l'imagerie sismique et de latomographie à haute résolution indique que le sommet de la croûte (couche 2A) n'est jamais scellé de 0 à 75 Ma et les systèmes hydrothermaux continuent dans la croûte océanique plus ancienne. La majeure partie de l'évolution se produit dans les 4 premiers Myr, au-delà de laquelle l'intensité de la circulation hydrothermale diminue et la couverture sédimentaire augmente. La limite de la couche 2A / 2B est un contact de lave / digue à l'axe de la crête et un front d'altération hydrothermale éloigné de l'axe de la crête. Les données de flux de chaleur colocalisées de l'expérience LITHOS soutiennent la possibilité de grandes cellules hydrothermales dans une croûte océanique plus ancienne. Le LAB est entièrement imagé sur une lithosphère âgée de 2 à 75 Ma. De 2à 47 Ma, il existe des preuves d'un canal LAB découplant le manteau lithosphérique du manteau asthénosphérique avec une lithosphère de 25 km d'épaisseur à 2 Myr et de 72 km à 47 Myr. Cependant, à partir de 49-75 Myr, une seule réflexion LAB est imagée, ce qui implique une perturbation possible de la base du canal en raison de la ligne volcanique du Cameroun adjacente. Des preuves solides d'anomalie thermique du manteau proviennent du fait que le LAB est moins profond et d'une lithosphère élevée
Previous studies on upper oceanic crust have been limited to young lithosphere and wide-angle seismic data, which lacks resolution in the upper crust. The oceanic lithosphere-asthenosphere boundary (LAB) has been studied extensively by seismological studies, but also suffers from low vertical resolution. The TransAtlantic ILAB experiment collected multi-channel seismic reflection data over oceanic lithosphere aged 0-75 Ma formed at the slow-spreading Mid-Atlantic Ridge in the Equatorial Atlantic Ocean. Analysis of upper crust by means of seismic imaging and high-resolution tomography indicates the top of the crust (Layer 2A) is never sealed from 0-75 Ma and hydrothermal systems continue in older oceanic crust. Most of the evolution happens within the first 4 Myr, beyond which intensity of hydrothermal circulation reduces and sediment cover increases. Layer 2A/2B boundary is a lava/dyke contact at the ridge-axis and a hydrothermal alteration front away from the ridge-axis. Co-located heatflow data from the LITHOS experiment supports the possibility of large hydrothermal cells in older oceanic crust. The LAB is imaged throughout on lithosphere aged 2-75 Ma. From 2-47 Ma, there is evidence of a LAB channel decoupling the lithospheric mantle from the asthenospheric mantle with the lithosphere being 25 km thick at 2 Myr and 72 km thick at 47 Myr. However from 49-75 Myr, a single LAB reflection is imaged implying possible disruption of the base of the channel due to adjacent Cameroon Volcanic Line. Strong evidence of mantle thermal anomaly comes from the LAB being shallower and an uplifted lithosphere
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Nkono, Collin. "Analyse multi-échelle et interprétation géodynamique des données morphostructurales associées au volcano-plutonisme phanérozoïque d'Afrique équatoriale (ligne du Caméroun et régions voisines)." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210440.

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De l’observation microscopique d’une lame mince à l’observation mégascopique d’une province volcano-plutonique par télédétection (SRTM, Landsat), ce travail s’intéresse aux méthodes de comptage, aux traitements statistique et fractale des tailles, formes, orientations et distributions spatiales ainsi qu’à l’interprétation pétrogénétique et/ou géodynamique de différents marqueurs géologiques (cristaux, linéaments, cônes volcaniques…) associés au volcano-plutonisme phanérozoïque d’Afrique équatoriale (Ligne du Cameroun et régions voisines).

L’analyse à l’échelle microscopique de la distribution de taille de grains et des textures de roches volcaniques et mantelliques (laves et enclaves provenant de l’île de Bioko, golfe de Guinée) a permis de mettre en évidence l’importance d’une quantification objective des paramètres de taille et des relations entre les phases minérales. Après avoir appliqué et discuté les résultats obtenus par les méthodes dites de « distribution de tailles de grains » ou CSD (Crystal Size Distribution), les relations spatiales entre les cristaux et donc les textures ont été étudiées par analyse fractale classique puis grâce à l’entropie de Shannon, dont il s’agit de la première application 2D. La généralisation de ces méthodes de comptage à des objets géologiques de plus grande taille (linéaments, cônes volcaniques…) par le biais des images satellites (Landsat) et modèles numériques de terrain (MNT) issus des données SRTM, a permis d’aborder de manière objective, sur un nombre suffisant de mesures, la morphostructure de la région étudiée. L’ensemble des données morpho-structurales, soit 15.171 linéaments, 8.092 cônes volcaniques ou complexes annulaires, d’une vaste zone de plus de 2.700.000 km2 autour du golfe de Guinée, ont permis d’élaborer plusieurs modèles structuraux locaux qui, synthétisés dans une vue spatio-temporelle complète depuis le Carbonifère jusqu’à l’actuel, ont permis de redéfinir l’évolution géodynamique de la région.

Cette zone mobile complexe, pincée entre le craton congolais et le craton ouest-africain, est caractérisée par un soubassement précambrien, réactivé lors de la mise en place des grands bassins sédimentaires et ensembles magmatiques phanérozoiques. Contrairement à un modèle unique, souvent invoqué, l’évolution géologique régionale se présente comme une suite de régimes transcurrents dextres se déplaçant spatialement autour des directions N80 au Jurassique, N120 au Crétacé et N30 du Paléogène à l’actuel. L’intégration des nombreuses données géochimiques et isotopiques de la littérature aux modèles géodynamiques de ce travail oblige à globaliser le magmatisme cénozoïque à l’échelle de l’Afrique équatoriale dans son ensemble qui se présente alors comme un « ensemble » magmatique cohérent.


Doctorat en Sciences
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Wallaert, Hélène. "Mains agiles, mains d'argile: apprentissage de la poterie au Nord-Cameroun. modes d'acquisition des compôrtements techniques." Doctoral thesis, Universite Libre de Bruxelles, 2000. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211720.

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Cogels, Serge. "Les Ntumu du Cameroun forestier: une société de non-spécialistes. Système de production, stratégies d'acquisition des ressources et enjeux du changement." Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211489.

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Lissom, Justin, and Danielle Velde. "Etude pétrologique des laves alcalines du massif d'Oku : un ensemble volcanique de la ligne du Cameroun." Paris 6, 1991. http://www.theses.fr/1991PA066559.

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Le massif d'oku est le plus septentrional des grands massifs continentaux de la ligne du cameroun, un ensemble volcano-plutonique oriente n30e, d'age tertiaire a actuel. Situe pres de l'intersection entre le prolongement sur le continent de la faille transformante de patos et les structures n30e de la ligne du cameroun, le massif d'oku est constitue par differents types de basaltes, de benmoreites, de trachytes et de rhyolites. Les basaltes inferieures contiennent d'abondants xenocristaux riches en nickel et chrome (olivine, clinopyroxene, spinelle, phlogopite), alors que les basaltes superieures contiennent des xenocristaux riches en fer (pyroxene, kaersutite, apatite). Les compositions des mineraux constitutifs des benmoreites au nord du massif sont differentes de celles des benmoreites au sud du massif. L'olivine des benmoreites au nord du massif a une composition proche de la fayalite; l'olivine des benmoreites au sud du massif contient jusqu'a 74% de forsterite. Les trachytes et les rhyolites peuvent etre subdivises en deux groupes avec et sans mineraux ferromagnesiens. Ces differences dans la mineralogie se refletent sur la composition chimique des roches. L'etude des elements majeurs, des elements en traces et des terres rares montre que les basaltes et les benmoreites sont issus de la fusion partielle d'une source mantellique. Les trachytes et les rhyolites proviennent de la cristallisation fractionnee des liquides de composition benmoreitique. Cette genese des laves temoignerait d'une tectonique periodique basee sur le rejeu senestre de failles decrochantes liees a l'ouverture de l'atlantique sud
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Missoup, Alain Didier. "Systématique et biogéographie des rongeurs des forêts de la ligne volcanique du Cameroun (Afrique Ouest centrale)." Paris, Muséum national d'histoire naturelle, 2010. http://www.theses.fr/2010MNHN0005.

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Les forêts de la Ligne Volcanique du Cameroun (LVC) font partie du point chaud de biodiversité guineo-congolais et ont été identifiées parmi les zones prioritaires de conservation dans le monde. Cet axe volcano-tectonique, qui s’est mis en place à partir du Crétacé supérieur, est une cordillere qui coupe le bloc forestier afro-tropical à la limite Ouest de l’Afrique centrale. Connue pour sa faune et sa flore originale (endémisme et forte richesse spécifique), la LVC constitue une région de choix pour tester les mécanismes de diversification de la faune des régions tropicales de plaine et de montagne. La comparaison des patrons de diversification obtenus pour plusieurs taxons devrait nous permettre d’identifier les évènements principaux qui ont structuré la biodiversité en Afrique centrale. Nous avons mené une analyse phylogéographique afin d’expliquer la distribution et la richesse (générique, spécifique et intraspécifique) actuellement observées sur la LVC. Lors de cette thèse nous avons choisi de nous focaliser sur les rongeurs. Ce groupe représente, de par le nombre d’espèces décrites, la part la plus importante de la biodiversité des mammifères. Plusieurs espèces ont été signalées comme étant endémiques de la LVC. De plus les rongeurs sont reconnus comme étant d’excellents modèles biologiques pour les études de phylogéographie. Les genres Lamottemys, Praomys, Hybomys, Hylomyscus et Lophuromys ont été retenus pour nos analyses. Nous avons combiné des données morphologiques et moléculaires pour tester la validité et déterminer la position phylogénétique de plusieurs espèces décrites comme endémiques de la LVC. Nous avons par ailleurs confronté les patrons phylogéographiques obtenus sur quatre espèces (P. Jacksoni, P. Misonnei, L. Eisentrauti, H. Rufocanus) afin de proposer un modèle de structuration de la biodiversité sur la LVC. Nos résultats ont été replacés dans un contexte temporel sur la base des datations moléculaires et ont été mis en relation avec les évènements paléo-géo-climatiques connus de l’Afrique tropicale et/ou de la LVC en particulier. Nous confirmons le statut spécifique de 5 espèces (Lamottemys okuensis, Praomys hartwigi, Praomys morio, Hybomys rufocanus et Lophuromys eisentrauti) parmi les 9 testées. H. R. Eisentrauti, H. R. Badius et L. E. Roseveari devraient être considérées comme des formes géographiques distinctes au sein de H. Rufocanus et de L. Eisentrauti respectivement. Des analyses supplémentaires sur P. Obscurus doivent être réalisées pour confirmer sa position taxinomique. L’endémisme sur la LVC a été essentiellement retrouvé chez les taxa habitant l’étage submontagnard et afromontagnard. La faune actuelle de rongeurs de cette région est le résultat de la diversité de ses milieux qui augmente son potentiel biotique. C’est également le résultat de trois facteurs historiques : les évènements volcanotectoniques, les fluctuations climatiques du Pléistocène et le rôle des barrières fluviales. Au début du Pliocène, la mise en place de la faune sur la LVC a été influencée par la reprise des activités volcanotectoniques dans cette cordillère et sur le Rift Est africain. Plusieurs cas de divergences récentes traduisent des diversifications allopatriques favorisées par les oscillations climatiques du Pléistocène entre les montagnes de la LVC ou entre ces montagnes et les plaines avoisinantes. Enfin, nous avons discuté de l’influence de la Sanaga et d’autres fleuves (Ogooue et Ivindo) comme facteur explicatif des patrons phylogéographiques obtenus en Afrique Ouest centrale. Deux sous régions biogéographiques peuvent être identifiées sur la LVC entre Bioko et le Tchabal Mbabo. Leur limite semble se situer entre le mont Lefo et le mont Oku. Il ressort en outre de ce travail que la LVC n’a constitué une barrière effective entre l’Ouest et l’Est de l’Afrique tropicale que récemment
The forests of the Cameroon Volcanic Line (CVL) belong to the guineo-congolese biodiversity hotspot and have been identified as one of the principal priority zones for conservation in the world. The topographical complexity of this region, quite unusual in the African humid-forest zone, has led also to climatic and edaphic diversity. Existing data demonstrate the region’s high levels of diversity and endemism for several relatively well-known groups. Patterns of differentiation across multiple lineages in the Cameroon volcanic line (CVL) should allow us to identify the main events that have structured biological diversity in the history of afro-tropical forests. We focus our study on rodents. This group represent the most specious of mammals and is particularly diversified in the CVL (with several endemic species). Moreover, rodents are known to be good biological models for phylogeographical studies. The genera Lamottemys, Praomys, Hybomys, Hylomyscus and Lophuromys were retained for this PhD thesis. We combined morphological and molecular approaches to assess the taxonomical validity of several species previously identified as endemic to the CVL and to infer their phylogenetic affinities. Moreover, we performed detailed phylogeographical studies on four species (P. Jacksoni, P. Misonnei, L. Eisentrauti, H. Rufocanus) to propose a model of structuration of the CVL biodiversity. We confirm the taxonomical validity of 5 of the 9 tested species (Lamottemys okuensis, Praomys hartwigi, Praomys morio, Hybomys rufocanus and Lophuromys eisentrauti). H. Eisentrauti. H. Badius and L. Roseveari should be considered as geographical forms within the species H. Rufocanus and L. Eisentrauti, respectively. Additional analyses on P. Obscurus should be carried out to confirm its status. CVL endemism mainly concerns submontane and afromontane species. The high rodent biodiversity in this region is maintained by the high diversity of habitats. Several historical factors explain the rodent diversification in this region: the volcano-tectonic activities, the climatic fluctuations of the Pleistocene and the presence of several rivers acting as geographical barriers to gene flow. At the beginning of the Pliocene, strong volcanic activities occurred in eastern Africa (Rift system) and in the CVL, which could have played a major role in favouring speciation events. Several divergent events dated from the Pleistocene were recorded in the CVL. It is likely that periodic climatic fluctuation in the region during the Pleistocene has been marked by the alternate expansion and contraction of montane and lowland-forest biotas. Individual species may have been restricted to refugia (whose location, number and size depended on the ecological tolerance of the species in question), leading to allopatric diversification of rodents. Finally we discuss the role of the Sanaga, Ogooue and Ivindo rivers in promoting or maintaining the diversification of rodents in West Central Africa. Two geographical sub-regions can be distinguished in the CVL: one grouping all the mountains from Bioko to mount Lefo, and another one grouping all the mountains from mount Oku to Tchabal Mbabo. According to our data, it seems likely that the CVL has constituted only recently a barrier preventing East-West exchange of lowland faunas
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Nkoumbou, Charles. "I. Étude géologique des Monts Roumpi : un ensemble plutonique et volcanique de la "Ligne du Cameroun"II. Données pétrologiques sur les néphélinites du Mont Etinde (Cameroun)." Nancy 1, 1990. http://docnum.univ-lorraine.fr/public/SCD_T_1990_0460_NKOUMBOU.pdf.

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Les monts Rumpi (sud-ouest Cameroun) sont constitués de roches plutoniques et volcaniques qui regroupent et reposent sur un substratum métamorphique et granitique. La géochronologie potassium-argon a été réalisée sur toutes les séries de roches. La série plutonique alcaline et ultime (gabbros-diorites-syénites) s'est différenciée par cristallisation fractionnée. La stratigraphie montre deux séries volcaniques allant des laves basiques alcalines aux laves felsiques hyperalcalines puis aux laves felsiques à kaersitite. La minéralogie, la géochimie et les équations de balance de masse indiquent une différenciation par cristallisation fractionnée. La source mantellique était enrichie en terres rares légères. Le montetinde a été cartographié et daté. Les caractéristiques pétrographiques, minéralogiques et géochimiques de ces laves nephelinitiques montrent qu'elles appartiennent à deux séries ou la cristallisation fractionnée a été, sporadiquement, perturbée par des réactions minéral-liquide et par des transferts d'éléments par des fluides. La source mantellique, chimiquement hétérogène, était enrichie en terres légères et était localisée en grande profondeur.
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Books on the topic "Cameroon Line"

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Jarocki, Barbara. Cameroon: Art and life interwoven. Chicago: May Weber Museum of Cultural Arts in cooperation with L. Kahan Gallery, 1988.

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Jones, Jade. Cameron. [S.l]: Jaded Publications, 2013.

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Jones, Jade. Cameron. [S.l.]: [s.n.], 2012.

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Jones, Jade. Cameron. [S.l.]: [s.n.], 2012.

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Culture and customs of Cameroon. Westport, Conn: Greenwood Press, 2005.

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Traditional institutions in Kembong (Cameroon). Berlin: D. Reimer, 2008.

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Edwin, Ardener. Kingdom on Mount Cameroon: Studies in the history of the Cameroon Coast, 1500-1970. Providence: Berghahn Books, 1996.

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Talking drums: From a village in Cameroon. London: J. Murray, 1985.

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Deane, Shirley. Talking drums: From a village in Cameroon. London: Murray, 1985.

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Journey of song: Public life and morality in Cameroon. Bloomington, Ind: Indiana University Press, 2006.

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Book chapters on the topic "Cameroon Line"

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Déruelle, B., C. Moreau, C. Nkoumbou, R. Kambou, J. Lissom, E. Njonfang, R. T. Ghogomu, and A. Nono. "The Cameroon Line: A Review." In Magmatism in Extensional Structural Settings, 274–327. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-73966-8_12.

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Zangmo, G. T., A. D. Kagou, D. G. Nkouathio, P. Wandji, and M. D. Gounté. "Geomorphological Features of the Manengouba Volcano (Cameroon Line): Assets for Geotourism and Other Anthropogenic Activities." In Geoheritage, Geoparks and Geotourism, 183–98. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-10708-0_13.

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Hager, Tamar. "Alienation and Intimacy: Transnational Writing on Julia Margaret Cameron." In Palgrave Studies in Life Writing, 107–26. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45200-1_7.

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Tchombe, Therese Mungah Shalo. "Changing Trends in the Provision of Psychosocial and Health Resources for Quality Childhood Development in Cameroon." In Handbook of Quality of Life in African Societies, 221–37. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-15367-0_11.

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Nkwi, Walter Gam. "Patriarchy Turned Upside Down: The Flight of the Royal Women of Kom, Cameroon from 1920 to the 1960s." In The Social Life of Connectivity in Africa, 65–80. New York: Palgrave Macmillan US, 2012. http://dx.doi.org/10.1057/9781137278029_4.

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Mbangwana, Paul N. "Pronoun-Like Usage in Cameroon English: The Case of Copy, Resumptive, Obligation, and Dummy Pronouns." In Structural and Sociolinguistic Perspectives on Indigenisation, 39–53. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7881-8_3.

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Njonfang, Emmanuel, Alexandre Nono, Pierre Kamgang, Vincent Ngako, and Félix M. Tchoua. "Cameroon Line alkaline magmatism (central Africa): A reappraisal." In Geological Society of America Special Papers, 173–91. Geological Society of America, 2011. http://dx.doi.org/10.1130/2011.2478(09).

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Nama, E. E. "Modelling variables to predict landslides in the south west flank of the Cameroon volcanic line, Cameroon, West Africa." In Unsaturated Soils for Asia, 813–17. CRC Press, 2020. http://dx.doi.org/10.1201/9781003078616-145.

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Teitchou, M. I., M. Grégoire, R. Temdjim, R. T. Ghogomu, C. Ngwa, and F. T. Aka. "Mineralogical and geochemical fingerprints of mantle metasomatism beneath Nyos volcano (Cameroon volcanic line)." In Geological Society of America Special Papers, 193–210. Geological Society of America, 2011. http://dx.doi.org/10.1130/2011.2478(10).

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Sharp, Thomas. "The changing boundaries of resistance: the UPC and France in Cameroonian history and memory." In Francophone Africa at fifty, 189–203. Manchester University Press, 2013. http://dx.doi.org/10.7228/manchester/9780719089305.003.0013.

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Thomas Sharp elaborates on the case of the Union des Populations du Cameroun (UPC), which became an underground guerilla movement in Cameroon after 1955. The UPC attempted in this period and well into the 1960s to build up an international anticolonial network, to mobilize against the structures of collusion between the Ahidjo Government and French institutions. Sharp notably offers a fresh interpretation of UPC activities between 1962 and 1966, which as a phase of the movement has not yet attracted scholarly interest. He links these experiences to the new situation of Cameroon under multi-party democracy from the 1990s, in which many opposition groups have attempted to ‘reveal’ this ‘hidden history’, as a method to secure international support for their political projects. This is especially true of secessionist Anglophone groups, whose leaders, like those of the UPC, claim to have been dispossessed of a ‘true’ independence by the continuation of neo-colonial relationships, as brutal and marginalizing practices.
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Conference papers on the topic "Cameroon Line"

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Schmidt, Christoph, Tom Richter, and Lena Bullmann. "DOES THE MORPHOMETRY OF SCORIA CONES RELATE TO THEIR AGE? RESULTS FROM THE CAMEROON VOLCANIC LINE." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-320687.

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Billong IV, Samuel Ismael, Bernabé Batchakui, René Simo Nono, and Georges Kouamou. "A pedagogic approach by contextual immersion." In Sixth International Conference on Higher Education Advances. Valencia: Universitat Politècnica de València, 2020. http://dx.doi.org/10.4995/head20.2020.11226.

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In several training institutions in sub-Saharan Africa today, the competency-based approach to teaching (CBA) has been adopted at the secondary school level. In Cameroon, based on our experience in teaching, we have found that this approach does not suit all categories of learners, generally the youngest. With the advent of Information and Communication Technologies (ICT), learners spend most of their time on ICT’s gadgets (mobile phone, tablet, etc ...). In this paper, we propose a complement to the CBA approach through pedagogic differentiation. This differentiation takes into account the learner's environment and adds a playful and captivating aspect to the techno-pedagogic tools to be made available to them through the gadgets they use. We call this approach contextual immersion. It starts from real life situation familiar to the learner. The tool made available to the learner, which integrates this approach, guides him/her progressively towards the solution to the problem posed and a generalization that summarizes the course that will be transmitted.
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Njome, M. S., C. E. Suh, and M. J. de Wit. "The Mount Cameroon Volcano, West Africa: an Active Link Between Recent Eruptives and Mantle Signatures of the Deep Past Beneath the Margins of Africa." In 11th SAGA Biennial Technical Meeting and Exhibition. European Association of Geoscientists & Engineers, 2009. http://dx.doi.org/10.3997/2214-4609-pdb.241.njome_paper.

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Riestiyowati, Maya Ayu, Setyo Sri Rahardjo, and Vitri Widyaningsih. "Cigarette Smoke Exposure and Acute Respiratory Infection in Children Under Five: A Meta-Analysis." In The 7th International Conference on Public Health 2020. Masters Program in Public Health, Universitas Sebelas Maret, 2020. http://dx.doi.org/10.26911/the7thicph.01.57.

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Background: Acute Respiratory Infections are classified into the upper and lower respiratory tract infections, contributing to the leading cause of death among children under five globally. The estimation showed the deaths of more than 800,000 children under five every year or about 2,200 per day. One of the risk factors for ARI in children under five years of age is secondary exposure to tobacco smoke. This study aimed to examine the effect of cigarette smoke exposure and acute respiratory infection in children under five. Subjects and Method: This was meta analysis and systematic review. The study was conducted by collecting published articles from Google Scholar, Pubmed, and Springer Link databases, from year 2010 to 2019. Keywords used “risk factor” OR “passive smoking” OR “secondhand smoking” AND “ARI due to children under five”. The inclusion criteria were full text, using English language, using cross-sectional study design, and reporting adjusted odds ratio. The collected articles were selected by PRISMA flow chart. The quantitative data were analyzed by fixed effect model using Revman 5.3. Results: 6 studies from Cameroon, Ethiopia, India, Nepal, and Nigeria reported that tobacco smoke exposure increased the risk of acute respiratory infection in children under five (aOR=1.39; 95% CI= 1.22 to 1.58; p<0.001). Conclusion: Tobacco smoke exposure increases the risk of acute respiratory infection in children under five. Keywords: tobacco smoke, acute respiratory infection, children under five Correspondence: Maya Ayu Riestiyowati. Masters Program in Public Health. Universitas Sebelas Maret, Jl. Ir. Sutami 36A, Surakarta 57126, Central Java. Email: maaya.ayuu.ma@gmail.com. Mobile: 081235840067.
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Ratcliffe, Nicholas M. "STRUCTURAL PETROLOGY OF THE LATE ORDOVICIAN APPINITE COMPLEXES OF THE CORTLANDT INTRUSIVE SUITE (CIS) AND YOUNGER EARLY SILURIAN(?) GRANITES ALONG CAMERONS LINE." In Joint 69th Annual Southeastern / 55th Annual Northeastern GSA Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020se-344101.

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Valero, Enrique, Alan Forster, Frédéric Bosché, Lyn Wilson, and Alick Leslie. "COMPARISON OF 3D REALITY CAPTURE TECHNOLOGIES FOR THE SURVEY OF STONE WALLS." In ARQUEOLÓGICA 2.0 - 8th International Congress on Archaeology, Computer Graphics, Cultural Heritage and Innovation. Valencia: Universitat Politècnica València, 2016. http://dx.doi.org/10.4995/arqueologica8.2016.2582.

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The maintenance of the external fabric of historic buildings constitutes a large portion of overall building life cycle costs.Advanced reality capture and data processing technologies have the potential to transform existing survey practice,providing surveyors with objective data pertaining to building fabric, in a more rapid (frequent), safe and cost-effectivemanner. In this paper, we present a unique evaluation of several Terrestrial Laser Scanning (TLS) and photogrammetric(PG) systems that assess their relative strengths for the survey of stone walls. The assessment is conducted using anhistoric building selected for its representativeness of form, fabric and condition. The work considers performance interms of data accuracy and precision, data completeness, and process efficiency. The results show that, while TLSprovides good geometric data to generate accurate and valuable 3D models, the quality of PG reconstructions can bealso be sufficient in such contexts. And considering the relatively low-cost and portability of modern digital camerascompared to laser scanners, photogrammetry can constitute a realistic alternative to TLS. In addition, mounting a cameraon a UAV could further solve access issues, preventing the need for any additional infrastructure (e.g. scaffolding), whichwould be required when employing TLS. However, a lesson drawn from this work is that effective acquisition ofphotogrammetric data requires careful planning to select the appropriate camera settings and picture density (andlocations) to ensure accurate and reliable photogrammetric reconstruction. This process may be referred to as: Planningfor Photogrammetry (P4P).
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Stolyarchuk, E. A., N. E. Vodopyanova, G. S. Nikiforov, and N. O. Zaruchnikova. "For corporate culture depending on self-regulation and values." In INTERNATIONAL SCIENTIFIC AND PRACTICAL ONLINE CONFERENCE. Знание-М, 2020. http://dx.doi.org/10.38006/907345-50-8.2020.645.659.

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The article presents the results of a study of corporate culture preferences depending on self-regulation and values of specialists working in project organizations for the development of complex technical systems (STS). As the methodological basis of the research, we selected R. Barrett’s concept of the levels of personal and organizational consciousness, the compatibility of personal and organizational values as factors that determine the development and effectiveness of companies in the modern business space (Barret, 1997). The purpose of the study: to determine the dependence of the preferred corporate culture of scientific and production associations by specialists of complex technical systems (STS) on their value orientations and self-regulation styles. Research methods: diagnostics of types of real and preferred corporate culture (Cameron, 2001), questionnaire «style of self-regulation of behavior» (Morosanova, 1988), author’s questionnaire of values based on the R. Barrett model (personal and corporate values), questionnaire «life goals and values» (Klyueva, 1997). Sample: 96 specialists of the STS Research and production Association (56 men and 40 women aged 28 to 55 years, with experience in the organization from 2 to 15 years. Conclusions. STS specialists assess the real corporate culture as bureaucratic and market-oriented. They want a clannish corporate culture or an adhocracy one. With a high level of self-regulation, professionals prefer clan and adhocracy cultures. STS specialists with a low level of self-regulation prefer a bureaucratic corporate culture. STS specialists have the predominant values of life, health and personal growth, and religion and fame are the least Their corporate values belong to the third level of consciousness (self-esteem, self-discipline, confidence, friendliness, influence and power, the effectiveness of the organization in business processes and management system). STS specialists have a high level of self-regulation with a predominance of styles for evaluating results, programming and modeling. Styles of self-regulation of planning, programming, and regulatory-personal properties of flexibility have a medium level, and independence-a low level, which is a consequence of the bureaucratic corporate culture. The obtained results served as a justification for the development of an algorithm for changing the corporate culture of an organization.
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Grigoriev, Mikhail, Chet Swiatek, and Jim Hitt. "Design and Development of Advanced Three-Dimensional Non-Periodic Diffusers for Centrifugal Compressors." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26487.

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Recent changes in the global economy have significantly impacted the air separation market. Companies traditionally focused upon initial capital expenditures, have shifted their mindset towards total life cycle costs. As a primary component in the air separation process, the compressor has been recognized as a significant contributor to life cycle costs of an air separation facility. Accordingly, market expectations have shifted towards more efficient compressor designs to reduce the overall power consumption. This paper highlights the development efforts at Cameron’s Compression Systems to design advanced 3D cascade diffusers, leading to the development of compressors with higher aerodynamic efficiencies. While the concept of matching the diffuser design towards the local flow field is not new, the implementation of this concept has been significantly hindered by a lack of understanding with regard to impeller discharge conditions. Furthermore, the tools necessary to explore these specifics either did not exist, or where prohibitive in terms of both cost and time. Over the past 20 years, great advances have been made in the area of computational engineering. The advancements in Computational Fluid Dynamics (CFD) tools have led to a better understanding of the transitional impeller flow fields. Furthermore, the dramatic progress in cheaper high-end computers has facilitated the design and development of sculpted three-dimensional diffusers within reasonable time frames and at relatively low cost. Recently, Cameron has deployed advanced sculpted 3D diffusers on limited production designs. This process involves a heavy utilization of STAR-CCM+ for performance analyses of centrifugal stages with various diffuser geometries. The CFD analyses vary from relatively simple steady state analyses with single impeller and single diffuser passages using indirect (mixing plane) interfaces to full stage unsteady simulations involving full inlet, impeller, diffuser and volute with a discharge pipe. This paper discusses a range of issues involved in performing CFD analyses for complex diffuser geometries. We show how CFD analyses are used to improve the aerodynamic performance of stages with respect to the regular low solidity cascade 2D diffusers. The paper provides results of comparative studies of the computational analyses with the aerodynamically tested data for the stages using both the regular low solidity 2D diffusers and sculpted non-periodic 3D diffusers. The test results confirm predicted improvements in compressor efficiency using sculpted non-periodic 3D diffusers over regular 2D diffusers by as much as 2% for peak efficiency. The paper discusses stage improvements due to use of 3D sculpted non-periodic diffusers.
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Reports on the topic "Cameroon Line"

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Facts about adolescents from the Demographic and Health Survey—Statistical tables for program planning: Cameroon 1998. Population Council, 2001. http://dx.doi.org/10.31899/pgy21.1007.

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The Population Council initiated its work on adolescents in the mid-1990s. At that time, those advocating greater attention to adolescent issues were concerned about adolescent fertility—particularly outside of marriage—and adolescent “risk-taking” behavior. As an international scientific organization with its mandate centered around the needs of developing countries, the Council sought a more nuanced and context-specific understanding of the problems confronting adolescents in the developing world. In working with colleagues inside and outside the Council, it became clear that information on adolescents, and the way data are organized, were limiting the ability to understand the diversity of their experiences or to develop programs to address that diversity. In the absence of data, many adolescent policies were implicitly based on the premise that the lives of adolescents in developing countries were like those of adolescents in Western countries. In fact, significant numbers of young people in the West do not fit this description, and even larger groups within the developing countries. The Council created tables to more clearly describe the diversity of the adolescent experience by drawing on Cameroon Demographic and Health Survey data. The tables, presented in this report, are intended to be used as a basis for developing programs.
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Environmental Assessment for Central Power and Light Company`s proposed Military Highway-CFE tie 138/69-kV transmission line project Brownsville, Cameron County, Texas. Office of Scientific and Technical Information (OSTI), April 1992. http://dx.doi.org/10.2172/10172093.

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