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Search Results: 1 - 10 of 3411 matches for " Felix Koffi Konan "
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Characterization of the Origin of Pollutants in Groundwater from Biostatistical Tests: The Case of Catchment Ehania, South-Eastern Côte d’Ivoire  [PDF]
Brou Dibi, Arthur Brice Konan-Waidhet, Felix Koffi Konan, Charles Sagne Yao, Alex Kouadio Zilé, Issiaka Savané, Dago Gnakri
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.512125
Abstract:

The threat of agro-industrial exploitations on the quality of groundwater resources has become a major concern for the worlds population, mainly in agricultural areas. To solve this problem, several methods such as vulnerability to pollutants and statistics methods, have been adopted to protect these groundwaters. In this study, statistical tests were used to determine the likely source of pollutants in the groundwater resources. First, we made a comparative analysis and then analyzed pollutants parameters using Kohonen self-organizing map (SOM) which allows basic on the similarity to help out any correlation between the physic-chemical parameters. To validate these results, a land use map was developed to identify the sources of pollutants in production functions of different activities taking place on the catchment area. The results indicate very high levels of certain pollutants such as NO3-, Cl- and SO42- with generally higher than World Health Organization (WHO) standards values. These high levels observed could be attributed to the generally free nature of aquifers alteration and sedimentary formations in areas of high agro-industrial production. The analysis of the data from SOM method reveals a strong correlation between pollutants (NO3-, SO42-,

Factors Influencing the Acceptance of the Gametes Donation in Côte d’Ivoire/West Africa  [PDF]
Ana Fatoumata Touré écra, Abdoul Koffi Koffi, Kacou Edele Aka, Minata Fomba, Perel Konan
Open Journal of Obstetrics and Gynecology (OJOG) , 2017, DOI: 10.4236/ojog.2017.75062
Abstract: Introduction: Africans ensure their offspring by transmitting their own genes. Even if adoption is a common thing in Africa, the biological kinship keeps its supremacy. The following study tries to identify socio-cultural factors that may influence the couples’ attitude towards the gametes donation. Methods: All female patients consulting for a childbearing desire and with an indication of an assisted reproductive technique with a third donor, were included in this longitudinal retrospective and prospective study at the teaching hospital of Yopougon and in a private clinic from 1st September 2014 to 31 October 2015. 100 couples were included. Chi square test was used for statistics data. The following factors were analyzed: age, sex, religion, profession, anterior procreation, existence of a common child, infertility duration. Results: Only the age had a significant link with the egg donation refusal rate. Conclusion: This work makes it possible to foresee that Africans have the same conception of procreation because one finds this desire of childbearing in all the layers of the society.
Rain-Flow Modeling Using a Multi-Layer Artificial Neural Network on the Watershed of the Cavally River (C?te d’Ivoire)  [PDF]
Brou Loukou Alexis, Kouassi Kouakou Lazare, Konan Kouakou Séraphin, Kouadio Zilé Alex, Konan Koffi Félix, Kamagate Bamory
Journal of Water Resource and Protection (JWARP) , 2017, DOI: 10.4236/jwarp.2017.912090
Abstract: Water resources management is nowadays a significant stake for the world. However, missing or bad quality of the hydro-climatic historical data available of the studied area makes sometimes hydrological studies difficult. Generally, conceptual rain-flow models are designed to bring an appropriate answer with the correction of gaps and prediction of the flows. Historical hydro-climatic data of the Ity station, located on Cavally River, contain gaps which must be bridged. This study aims to establish a rainfall-runoff model through artificial neural networks for filling the gaps into the flow data series of the hydrometric station of Ity on the watershed of Cavally River. A multi-layer perceptron of feed forwards with two entries (monthly average rain and evapotranspiration) and an exit (flows) was established with flow evapotranspiration data. Comparison of the criteria of performance of the various architectures of the neural network model showed that architecture 2-3-1 gives best results. This architecture provides Nash coefficients of 75.79% and correlation linear coefficient of 95.64% for the calibration and Nash coefficients of 73.32% and correlation linear coefficient of 98.33% for the validation. The correlations between simulated flows and observed flows are strong. The correlation coefficients are 83.89% and 83.08% respectively for the calibration and validation.
Unsaturated Flow Drying Bed (UFDB): An Alternative for Treatment of Septic Tanks Sludge  [PDF]
Gnagne Théophile, Yéo Ténénan Martial, Kouamé Yao Francis, Konan Koffi Félix
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.65045
Abstract:

Unsaturated Flow Drying Bed (UFDB) principles are based on the ones of wastewater treatment by infiltration-percolation on the one hand and septic tanks sludge solar-drying beds on the other hand. With UFDB, sludge charges are split with low heights, leading to the drying of suspended solids in 2 days, and the infiltration of the flow of liquid in unsaturated middle. For average charges reaching 12.5 cm/d, the treatment efficiency of total oxygen demand and Total Kjeldahl Nitrogen, respectively 95 and 96%, correspond to a treatment capacity of 0.5 kg of O2/d/m2 of drying area. Bacteria reductions of 4 Ulog are obtained from filtrates outlet, with average fecal coliforms charges less than 103 CFU/100 ml. Monitoring the hydrodynamic behavior through rates, moisture, organic matter and respiratory activity demonstrates that the clogging of the massifs is linked to a biofilm growth within them. A four week resting period allows biofilm resorption. Thus, the drying of the infiltration surface in two days, the elimination of carbon, nitrogen and bacterial pollutions, as well as the reversibility of clogging show that UFDB is a credible alternative for the treatment of septic tank sludge in the socio-economic context and climate of tropical Africa.

Mineralogical and Chemical Characteristics of Clays Consumed in the District of Abidjan (CÔte D’Ivoire)  [PDF]
Vamoussa Coulibaly, Joseph Sei, Léon Konan Koffi, Samuel Oyetola, El-A?d Jdid, Fabien Thomas
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.514108
Abstract: Clay materials of the quarry of Bingerville (district of Abidjan) have been characterized by chemical analysis, X-rays diffraction, infrared spectroscopy and thermal analysis. These materials contain kaolinite (41% - 84%), illite (4% - 10%), quartz (14% - 27%), goethite (2% - 5%) and small amount of rutile (1%) that are not toxic minerals. They also contain some heavy metals which are beneficial to human biological activity (cobalt, copper, molybdenum, zinc) in tiny quantities. Some other heavy metals (lead, cadmium) which are considered as poisonous for human are present in very low content. The samples characterized by relatively fine grains are moderately crystallized. Their specific surface area varied from 26 to 43 m2·g1. The mineralogical and physicochemical characteristics of these samples are like ones known for their healing properties. The consumption by internal way of studied materials, although it may be beneficial, requires a sifting to remove coarse grains (Φ > 2 μm) and a previous microbiological control.
Mapping of Pollution Risk of Surface Waters by Runoff from Watershed: Case of Aghien Lagoon (South of Côte d’Ivoire)  [PDF]
Konan Jean-Pierre Koffi, Yao Alexis N’Go, Diakaria Kone, Kouakou Hervé Kouassi, Savané Issiaka
Journal of Water Resource and Protection (JWARP) , 2015, DOI: 10.4236/jwarp.2015.717119
Abstract: The operating capacity of the Abidjan’s groundwater became insufficient. The deficit in drinking water resources in the District of Abidjan remains the major concern of the decision maker. The Aghien lagoon stands as one of the most interesting alternatives. However, studies show the levels of pollutions of this resource without lighting out on the causes and sources of these pollutions. The present study extends over the entire catchment of the Aghien lagoon which reveals the presence of urban areas and agricultural activity areas. This raises real concerns for the Ivorian authorities. This study suggests making cartography of the risk levels of pollution on the Aghien lagoon by the surface runoff on the watershed to enlighten the decision-makers on the possible measures to be taken for the protection of this resource. It emerges from it that the risk of contamination of the lagoon is very likely. Agricultural and domestic best practices inside the pouring pond are compulsory to fight against the pollutions of this resource.
Prevention of Cervix Cancer in a Low Resources Country: Operational and Clinical Aspects of a Screening’s Network in a Suburb of Abidjan (C?te d’Ivoire)  [PDF]
Horo Apollinaire, Koffi Abdoul, Aka Kacou Edele, Seni Konan, Koné Mamourou
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.61010
Abstract: Background: Cancer of the cervix is the most common cancer and the leading cause of death by cancer in women in developing countries. According to WHO, there were in 2002 in the world more than 500,000 new cases of cervical cancer, with more than 90% in developing countries. Secondary prevention of cervical cancer is done through screening of precancerous lesions and early diagnosis of cancer followed by treatment. Objectives: Our experience was reported in the management of a network of screening in the prevention of cancer of the uterine cervix. Method: After a program of training and upgrade to a pool of specialist doctor of obstetrics and gynaecology and midwifery centers health on visual screening methods, a reference site that is also a trainer site was defined and equipped with video-colposcopy and cryotherapy device. In April 2014, four peripheral sites have been installed with an equipment of lamp, magnifying glasses, acid acetic 5% and Lugol’s iodine. The screening network has been implemented and works on the model of reference-cross-reference. Results: The assessment of a year’s activity of the peripheral centers reported 993 patients, 653 consultations at the reference site, 106 precancerous lesions (6%), and 86 cases of references. The age of attendance peak lies in the age group of 35 - 55 years. Conclusion: The improvement of women’s participation requires organized screening, mass communication strategies, and systematic proposal of screening in consultation.
Vulvar Basal Cell Carcinoma of a 40 Years Old Black Woman: About a Case and Literature Review  [PDF]
Gninlgninrin Apollinaire Horo, Kacou Edele Aka, Abdoul Koffi, Konan Séni, B. Effi, Koné Mamourou
Open Journal of Obstetrics and Gynecology (OJOG) , 2016, DOI: 10.4236/ojog.2016.69071
Abstract: Vulva Basal Cell Carcinoma (BCC) is a rare tumor. It usually occurs in Caucasians at an advanced age. We present a case of vulvar BCC in an African patient under 40 years old with HIV infection successfully treated surgically. This presentation is exceptional because of age, race, and the immune status of the patient.
Thermal Conductivity of Compressed Earth Bricks Strengthening by Shea Butter Wastes with Cement  [PDF]
Herve Goure Doubi, Alfred Niamien Kouamé, Léon Koffi Konan, Monique Tognonvi, Samuel Oyetola
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.812062
Abstract: Currently, in a context of sustainable development, the economic and environmental challenges incite, to valorize local materials such as clays and agro-industrial waste. It is in this approach that a new category of compressed earth bricks (BTC) stabilized with shea meal (TK) and cement was proposed. The purpose of this paper is to investigate the effect of shea meal rate on the thermal conductivity properties of cement stabilized earth bricks. A lateritic clay (Lat) mainly composed of kaolinite (38.44%), quartz (24.94%), goethite (12.28%), hematite (4.44%) and illite (19.9%) was used to make bricks. Different mix designs made up of lateritic clay and 5% cement were studied. The shea meal is added as a partial lateritic clay replacement in different proportions. The thermal conductivity was determined by hot disk method and correlated to both porosity and density of elaborated materials. The results obtained show that the thermal conductivity and density of bricks decrease respectively from 0.72 W·m-1·K-1 to 0.52 W·m-1·K-1 and from 2.77 g·cm-3 to 2.52 g·cm-3. The presence of shea meal within the material generates pore formation, which may partly explain the improvement of the thermal insulation properties. A positive correlation was noted between density and thermal conductivity of these materials.
Structural and Thermomechanical Study of Plastic Films Made from Cassava-Starch Reinforced with Kaolin and Metakaolin  [PDF]
Namory Meite, Léon Koffi Konan, Drissa Bamba, Bi Irié Hervé Goure-Doubi, Samuel Oyetola
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.91003
Abstract: The structural and thermomechanical properties of starch-based plastic films reinforced with kaolin and metakaolin have been studied by various techniques (X-ray diffraction, IR-TF spectroscopy, scanning electron microscopy, tensile tests, and thermal resistance). The results obtained showed that kaolin, an inert material, prevents the starch from losing its granular structure and to solubilize during the heating, generating plastic films of low Young’s modulus (7 MPa). On the other hand, metakaolin, an amorphous and dehydroxylated material obtained after heating of kaolin at 700°C for 1 hour, substantially improves the thermomechanical properties of the plastic films. The Young’s modulus increases from 19 MPa to 25 MPa while the thermal resistance increases from 90°C to 120°C. This was attributed to good dispersion of the metakaolin in the polymer matrix after the loss of the granular structure of the starch during heating.
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