221 resultados para Abidjan-Vridi


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In this report, accurate data from coastal stations and from the Vridi hydrological station were gathered. The used experiments took place from 1989 to 1991.

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Along the Ivorian seaboard we have seven (7) stations where sea water temperature is measured every morning between 7:30 and 8:00. The hydrologic station of Vridi located at point A (5°05N, 4°05W) is generally exploited twice a week. In this report we are going to deal with data collected in 1984 and 1985. The irregularity of the dynamic height at point A enables us to identify water masses that go over the continental plateau.

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In this report were gathered accurate data from coastal stations and from a hydrological station. The used experiments took place from 1986 to 1988.

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In this document the monthly T-S diagrams and the regression lines of the temperature and salinity two weeks mean values have been drawn for 0, 5, 10, 15, 20 and 25 meters of depth. The annual variations of the dynamic height anomaly are represented for every coastal station from 1966 to 1980.

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Beach surface temperature is recorded every morning between 7h30 and 8h00 at each coastal station. On figure 2, 3, 4 and 5 it has been plotted daily variation and mean variation computed on 7, 15 and 30 days basis of sea surface temperature. However it seems that variations of dynamic height anomaly are reflecting more accurately the stages of the coastal upwelling than the sea surface temperature.

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In this report, vertical distributions of the temperature and horizontal velocity components of the currents, got from the two sections BELIER (305 1'W) and VRIDI (4°O 5'W), carried out once a week during the 1983 year, on the Continental shelf of Ivory Coast, are shown.

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On tables 1 to 12, daily beach surface temperatures are presented. These temperatures are also ploted on figures 2 to 5 in daily values and in 7, 15, 30 days means. Salinity variations are less important than these of temperature (Fig. 6, 7). It follows that during upwelling period, variations of dynamic height anomaly are closely correlated with temperature (Fig. 6 and 8).

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This paper presents results related to a study of toxic heavy metals concentrations (Cd, Cu, Hg and Zn) in Crassostrea gasar (mangrove oyster). A comparative study is made between samples collected in urban region (Abidjan) and those from rural areas (Assinie-Mafia and Assouindé). Toxic metals concentrations in oyster samples collected in urban zone are higher than those in rural samples, as a result of chemical pollution due to urban and industrial wastes. Correlations between pollutants-weight of organisms and pollutants are good.

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This article presents the results of three surveys, which were undertaken in order to estimate the levels of organic and bacterial pollutions of the Ebrié lagoon banks in the urban area of Abidjan.

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The total coliforms, fecal coliforms and fecal streptococci were counted over 1 year at 33 stations in the Ebrié Lagoon near Abidjan (Ivory Coast). Most of the waters show high numbers of bacteria, (D category of the American standards). For the sea-beaches, high numbers of fecal germs are found where the human population is abundant.

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From March 1966 to March 1970 some hydrographic observations were collected twice a week at a coastal station, off Abidjan. These data show the alternation of well defined water masses over the Ivorian Continental shelf. Grouping all observations on a T-S diagram, it is possible to differentiate four marine seasons, which are typical of an austral type of climate such as is observed off Pointe Noire.

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Methods for the estimation of zooplankton biomasses, used in the Oceanographic Research Center of Abidjan are presented. They deal with settled and displacement volumes, dry weight and ash-free dry weight, elementary carbon, nitrogen and phosphorus composition. The dry weight method is detailed: elimination of salt by a fresh water stream, preservation of dry samples at -20 degrees Celsius, rehydration during weighing. A few comments on the 'CHN' analysed values are made: at 1,100 degrees Celsius, most of the carbon is organic, only 10% of the mineral fraction being analysed.

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Graphs of variations of zooplankton biomasses expressed as ash-free dry weight (i.e. organic matter) are presented for the 1969-1979 period. The graph of the average year shows: an enrichment season from mid-July till mid-November in which the biomass is 2.3 times higher than the rest of the year and characterized by a slight decrease of the biomass in late August or early September. The warm season is divided into a period of moderate biomass from November till February, a period of moderate biomass from November till February and a period of steady decline of the biomass till the start of the upwelling at the end of June.

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The author reports on a simplified computer programme which allows the computation of only those fishery statistical data which are directly useful, particularly for the problem related with studies on sardine stocks.

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Les Technologies de l’Information et de la Communication (TIC) sont de plus en plus présentes dans toutes les sphères de la société y compris dans l’éducation. Pour favoriser des usages effectifs de ces technologies par des enseignants dans les salles de classe, il devient pertinent de s’intéresser aux usages qu’en font certains formateurs et futurs enseignants dans le cadre de la formation initiale. Ainsi, dans le contexte de la formation initiale des enseignants en Côte d’Ivoire à l’ENS d’Abidjan, l’objectif général de la présente thèse est de documenter les usages et la compétence TIC. Pour répondre à ces préoccupations, une étude qualitative exploratoire a été réalisée à l’Ecole normale supérieure (ENS) d’Abidjan en Côte d’Ivoire. Les entrevues individuelles semi-dirigées avec des formateurs (n = 9) et des futurs enseignants (n = 15) ont été analysées, en adoptant une approche méthodologique basée essentiellement sur l’analyse du contenu. Les résultats sont présentés sous forme d’articles scientifiques. La thèse tente ainsi de décrire des usages des TIC par des futurs enseignants, de dresser un profil des formateurs usagers des TIC dans le cadre de la formation initiale à l’ENS d’Abidjan. Elle veut aussi examiner les usages des TIC par des futurs enseignants, en formation initiale, pour certaines des composantes de la compétence TIC. Les résultats obtenus permettent de dresser une typologie des usages des TIC par des futurs enseignants dans le cadre de leurs activités d’apprentissage. Pour ce qui est des formateurs, trois profils d’usagers ont été dressés : 1. Les usagers de bas niveau qui font usage des TIC uniquement pour la recherche et la production de documents ; 2. Les usagers de niveau moyen qui, en plus de la recherche et la production de documents, utilisent les outils électroniques de communication dans leurs pratiques professionnelles, et font souvent usage des TIC dans leur classe ; 3. Les usagers de bon niveau qui, en plus de faire usage des outils de communication dans leurs pratiques professionnelles et d’intégrer les TIC dans leurs pratiques en classe, disposent de pages Web à but éducatif. Par ailleurs, l’analyse des discours des futurs enseignants sur les usages des TIC laisse percevoir que la compétence TIC se révèle de façon inégale à travers quatre de ses composantes. En effet, même s’ils n’ont pas une posture critique face aux TIC, ces futurs enseignants ont une conscience de leurs avantages dans le cadre de leur formation. Ainsi, ils utilisent les TIC pour communiquer, rechercher les informations, les interpréter afin de résoudre un problème, se constituer un réseau d’échanges et de formation continue. Même si l’intégration des TIC dans la formation initiale des enseignants en Côte d’Ivoire n’est pas encore effective, des formateurs et des futurs enseignants en font usage dans le cadre de la formation.