Kecernaan Bahan Kering Dan Bahan Organik Campuran Rumput Mulato (Brachiaria Hybrid.cv.mulato) Dengan Jenis Legum Berbeda Menggunakan Cairan Rumen Sapi

Penelitian ini bertujuan untuk mengetahui kecernaan bahan kering dan bahan organik campuran rumput mulato dan jenis legum yang berbeda (daun sengon, daun lamtoro, dan daun gamal) yang diuji secara in vitro. Penelitian ini menggunakan Rancangan Acak Lengkap dengan 3 perlakuan dan 3 ulangan. Masing-masing perlakuan tersebut ialah R1 (rumput mulato 50% + daun sengon 50% + cairan rumen 8 ml) R2(rumput mulato 50% + daun lamtoro 50% + cairan rumen 8 ml)R3 (rumput mulato 50% + daun gamal 50% + cairan rumen 8 ml). Data yang diperoleh dianalisis dengan menggunakan analisis sidik ragam (ANOVA). Hasil analisis sidik ragam menunjukkan bahwa campuran rumput mulato dan jenis legum yang berbeda tidak berpengaruh nyata (p>0,05) terhadap kecernaan bahan kering dan kecernaan bahan organik

Multivariate statistical analysis of groundwater mineralization in Daloa and Zoukougbeu, central west, Côte d'Ivoire

This study aims to determine the mechanisms of groundwater mineralization in the departments of Daloa and Zoukougbeu (Central West, Côte d’Ivoire). In order to achieve this, a hydrochemical study was carried out from seventeen (17) water samples (wells and sources) collected in March 2018. It was based on the multivariate statistical analysis techniques: The Principal Component Analysis (PCA) and the Hierarchical Cluster Analysis (HCA) were applied to physicochemical parameters. Thus, the average values of temperature, pH, electrical conductivity, Total Dissolved Solids (TDS) and Turbidity measured in situ in source waters are respectively 27.63°C; 4.81; 84.6 μS / cm; 38.45 mg. L-1 and 40.78 NTU and in well water 27.90°C; 4.78; 81.85μS/cm; 36.61 mg. L-1 and 27.22 NTU. The average concentrations of the major cations Ca2+, Mg2, Na+ and K+ of well water are respectively 2.26; 1.01; 4.58; 1.41 mg. L-1 and those of spring waters 2.18; 1.03; 5.50 and 2.07 mg.L-1. The major anions HCO3-, Cl-, SO42- and NO3- respectively amount to 8.81; 8.28; 5.33 and 7.67 mg.L-1 for well water and 11.77; 8.5; 5.27 and 8.25 mg.L-1 for spring waters. The PCA results show that three phenomena govern the mineralization of these waters. These are the phenomena of mineralization-residence time of water which is acquired by acid hydrolysis of the host rocks, spatial origin of lower quality of water and the grounds throughfall. These phenomena are confirmed by the Hierarchical Cluster Analysis (HCA). This work is therefore a tool for supporting groundwater management.Keywords: Groundwater, Mineralization, PCA, HCA, Central West, Côte d'Ivoir

Optical characterization of a-Si : H thin films grown by Hg-Photo-CVD

Mercury-Sensitized Photo-Assisted Chemical Vapor Deposition (Hg-Photo-CVD) technique opens new possibilities for reducing thin film growth temperature and producing novel semiconductor materials suitable for the future generation of high efficiency thin film solar cells onto low cost flexible plastic substrates. This paper provides some experimental data resulting from the optical characterization of hydrogenated amorphous silicon thin films grown by this deposition technique. Experiments have been performed on samples deposited at different temperatures, with and without thermal annealing.Mercury-Sensitized Photo-Assisted Chemical Vapor Deposition (Hg-Photo-CVD) technique opens new possibilities for reducing thin film growth temperature and producing novel semiconductor materials suitable for the future generation of high efficiency thin film solar cells onto low cost flexible plastic substrates. This paper provides some experimental data resulting from the optical characterization of hydrogenated amorphous silicon thin films grown by this deposition technique. Experiments have been performed on samples deposited at different temperatures, with and without thermal annealing

Hydrochimie des eaux de surface de la région d’Adiaké (sud-est côtier de la Côte d’Ivoire)

Objectif : Évaluer la qualité physicochimique des eaux de surface de la région d’Adiaké (sud-est côtier de la Côte d’Ivoire) et expliquer les phénomènes à l’origine de la minéralisation de ces eaux.Méthodologie and résultats : Dix-sept paramètres physico-chimiques sont déterminés pour chacun des 7 échantillons d’eaux. Les résultats sont traités à l’aide de méthodes hydrochimiques (diagramme de Piper) pour l’étude de la typologie des eaux et des techniques d’analyse statistique multivariée. L’Analyse en Composantes Principales Normées (ACPN) et l’analyse en Classification Hiérarchique Ascendante (CHA) sont utilisées pour mettre en évidence respectivement les phénomènes à l’origine de la minéralisation des eaux et les liens entre ces eaux. Les eaux étudiées sont acides (5,09 pH 7,43) et très faiblement minéralisées (CE100 JScm-1). Les teneurs des paramètres chimiques sont inférieurs aux normes OMS ; excepté, la silice (15,8 mg/L à 56,8 mg/L) et les éléments métalliques en traces : le fer (0,31 à 3,82 mg/L), le manganèse (0,019 à 0,264 mg/L) et l’aluminium (0,02 à 0,232 mg/L). Les eaux sont dans la majorité chlorurées sodi-potassiques. Trois phénomènes sont à l’origine de la minéralisation des eaux : les apports des activités anthropogéniques, le pluviolessivage des sols et le contact eau-roche (principal mécanisme de production d’ions). Trois groupes d’eaux sont obtenus. La Bia se distingue des autres eaux par son importante composition chimique.Conclusion et applications : Cette étude révèle que 43% des eaux de surface de la région d’Adiaké subissent une pollution anthropique importante. En dehors de la contamination bactérienne non traitée, cette étude montre que les eaux du Toumanguié, de l’Ehania et de la lagune Ehy peuvent représenter d’importantes réserves pour l’approvisionnement en eau potable de la région.Mots-clés : Eaux de surface, Paramètres physico-chimique, Éléments Métalliques en Traces, région d’Adiaké, Côte d’Ivoire

Spatiotemporal variations in the abundance, biomass, fecundity, and production of Oithona brevicornis (Copepoda : Cyclopoida) in a West African tropical coastal lagoon (Grand-Lahou, Cote d'Ivoire)

Raphael N'doua Etile, Maryse N'guessan Aka, Aka Marcel Kouassi, Marc Pagano, and Valentin N'douba (2012) Spatiotemporal variations in the abundance, biomass, fecundity, and production of Oithona brevicornis (Copepoda: Cyclopoida) in a West African tropical coastal lagoon (Grand-Lahou, Cote d'Ivoire). Zoological Studies 51(5): 627-643. Oithona brevicornis is a very important zooplankton species in coastal and estuarine aquatic ecosystems of West Africa and was recorded in very high abundances in coastal lagoons of Cote d'Ivoire. To better understand the functional role of this key species, spatio-seasonal variations in O. brevicornis abundance, biomass, fecundity, and production were investigated at 21 stations in Grand-Lahou Lagoon during an annual cycle from Jan. to Dec. 2004. The abundance and biomass showed more or less important spatiotemporal variations. Two peaks were recorded for the mean spatial values in Feb.-Mar. and Sept. During the long (LDS) and short dry seasons (SDS), all developmental stages showed their weakest density and biomass in the channel zone and near the mouth of the Boubo River. During the long (LRS) and short rainy seasons (SRS), O. brevicornis almost disappeared or showed very low abundances (< 1 individual/L) in the northern part and near the channel. Spatiotemporal variations in O. brevicornis fecundity and production showed no particular pattern during the dry seasons (LDS and SDS), while during the rainy seasons (LRS and SRS), very low fecundity and production values were recorded at stations influenced by river inputs. Correlation analyses showed that temperature and salinity were the main variables explaining these spatio-seasonal variations. http://zoolstud.sinica.edu.tw/Journals/51.5/627.pd

Use of benthic foraminifera with elongated tests (endofauna) in the determination of depositional environments: case of the interval 1840-345 m of oil-well IVCO 25 off Côte d"Ivoire, West Africa

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Design of an Integrated Cotton Picking System for Small-Scale Indian Agriculture

India, the world's largest producer of cotton, contains more than 4 million cotton farms that are less than 5 acres. These farms are incapable of large-scale mechanization due to small farm size and irregular farm shape. A previous team developed a handheld, roller-based picking device that demonstrated increased performance over similar products. However, a significant improvement in productivity requires increasing picking speed through mechanization as well as increasing worker cotton carrying capacity. We present a system that utilizes the roller-based picking device in tandem with a compressive storage bag and an efficient carrier. Through modeling and initial testing, the system demonstrates a two times (2X) improvement in worker productivity over current methods. This paper characterizes the cotton picking process, details the modules of the integrated system, and suggests further procedural improvements for greater increases in worker productivity