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Search Results: 1 - 10 of 36 matches for " Adolphe Moukengue Imano "
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Assessment of Sustainability Indicators of Thermoelectric Power Generation in Cameroon Using Exergetic Analysis Tools  [PDF]
Moungnutou Mfetoum Inoussah, Moukengue Imano Adolphe, Lissouck Daniel
Energy and Power Engineering (EPE) , 2017, DOI: 10.4236/epe.2017.91003
Abstract: In this paper, we evaluate the performance and sustainability indicators of various thermal power generation technologies in Cameroon using the exergy analysis tools. For this purpose, on the basis of data from the International Energy Agency (IEA) for Cameroon corresponding to the period from 2006 to 2014, we calculated the average energy and exergy efficiencies of each electricity generation technology from thermal sources. The average values of the exergy efficiencies obtained are respectively 28.97% for the LFO plants, 30.94% for the HFO plants, 34.66% for the biofuel plants and 36.67% for the gas-fired plants. The average sustainability indexes for each of the technologies are determined and values range from 1.56 for LFO plants to 2.12 for biofuel plants. The improvement potentials of each technology are calculated in order to identify the tracks of increase of their efficiency. Average values range from 165.57 GWh for biofuel plants to 1301.77 GWh for LFO plants. The results of this study should enable the development of productive and applicable planning for future energy policies, in particular for the electricity sector in Cameroon.
Elaboration and Performance Analysis of a Bio-Based Insulating Liquid from Castor Oil for Power Transformers  [PDF]
Emeric Tchamdjio Nkouetcha, Ghislain Mengata Mengounou, Adolphe Moukengue Imano
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105404
Abstract:
The research for new mineral oil substitutes focuses on vegetable oils known for their biodegradability and low toxicity. This paper focuses on the development and analysis of physicochemical and dielectric properties of a bio-based insulating liquid from castor oil. Castor oil is an inedible tropical resource. It has a good annual oil yield and is widely available in developing countries. Cold pressing of castor seeds is the most appropriate non-chemical process for extracting oil. A refining process was used to remove metal and chemical residues. Refined Castor Oil was filtered and degassed in order to minimize the dissolved gases, solid particles and moisture. A transesterification operation was performed to significantly reduce viscosity oil. Finally, obtained Castor Oil Methyl Esters (COME) are finally distilled in a rotary evaporator under vacuum to remove traces of water and methanol. Physicochemical properties as visual examination, relative density, kinematic viscosity, and acidity were measured in accord-ance with ASTM D6871. AC Breakdown voltage was performed according to IEC 60156, and had been analyzed using Weibull distribution. Processed Castor Oil (PCO) has low viscosity than certified transformer vegetable oils (BIOTEMP, FR3) and high Dielectric Strength (74.67 kV/2.5 mm). Partial Discharges characteristics including the Partial Discharge Inception Voltage and the Partial Discharge Propagation Voltage were also investigated according to the recommendations of IEC 61294. PCO has satisfactory properties for their use as an insulating oil for transformer.
Intertextuality in Theory and Practice
Adolphe Haberer
Literatura , 2007,
Abstract:
Degradation of Metalaxyl and Mefenoxam and Effects on the Microbiological Properties of Tropical and Temperate Soils
Adolphe Monkiedje,Michael Spiteller
International Journal of Environmental Research and Public Health , 2005, DOI: 10.3390/ijerph2005020011
Abstract: The degradation of various formulations of the racemic mixture and the enantiomers (including mefenoxam) of metalaxyl in typical soils from Germany and Cameroon in controlled incubation experiments was studied. The kinetics of the degradation or transformation was determined by means of reversed phase HPLC, while the enantiomeric ratios were measured by HPLC with a chiral Whelk O1 column. The dynamics of the quantitative changes in microbiological properties induced by the addition of these fungicides at their recommended field rates were determined in the soils during a 120-day incubation experiment. The degradation followed first-order kinetics (R2≥0.96). Higher metalaxyl acid metabolite concentrations were found in German than in Cameroonian soils. The enantiomers of the fungicide had different degradation rates in both soils, with half-lives ranging from 17 to 38 days. All forms of metalaxyl had lower degradation rates in the Cameroonian soil than in the German soil. The degradation of the R-enantiomer was much faster than the S-enantiomer in the German soil and slower than the S-enantiomer in the Cameroonian soil, suggesting that different microbial populations, which may be using different enzymes, have different degradation preferences. The type of soil significantly influenced the effect of these fungicides on the soil parameters studied. Incorporation of these fungicides resulted in a change in the ecophysiological status of the soil microbial community as expressed by microbial activities. The activity of phosphatases and ?-glucosidase, the mineralization and availability of N and most plant nutrients in soils were stimulated, whereas the activity of dehydrogenase and the availability of NO3-, were generally adversely affected. The soil NH4+, NO3-, and enzymes activities values in general did not correlate with the degradation of metalaxyl in both soils. However, the degradation of formulated and unformulated metalaxyl was positively correlated to the activity of acid phosphatase in the German soil (R2, 0.84 and 0.94 respectively) and in the Cameroonian soil (R2, 0.97 and 0.96 respectively).
La psicologia de l'adolescència. L'adolescència i l'escola aciva The Psychology of Adolescence: Adolescence and the Active School La psicología de la adolescencia. La adolescencia y la escuela activa
Adolphe Ferrière
Temps d'Educació , 2008,
Abstract: Text de la conferència pronunciada per Adolphe Ferrière el dia 5 de desembre de 1930 en la inauguració del Seminari de Pedagogia de la Universitat de Barcelona. El text, en versió catalana, ha estat tradu t i reconstru t per Joan Soler Mata. _____________________________________________ Texte de la conférence prononcée par le pédagogue suisse Adolphe Ferrière le 5 décembre 1930 pour l’inauguration du séminaire de pédagogie de l’Université de Barcelone. Le texte, en version catalane, a été traduit et reconstruit par Joan Soler Mata. La reconstruction a été faite avec trois sources documentaires : les notes manuscrites du même Ferrière ; un résumé, en version espagnole, de la conférence qui avec le même titre a donné pendant son voyage par l'Amérique latine, et un article étendu du même Ferrière. Text of a speech given by Adolphe Ferrière on 5 December 1930 to open the Seminary of Pedagogy, of the University of Barcelona. The Catalan version of the text has been translated and reconstructed by Joan Soler Mata. The reconstruction has required three documentary sources: the written by hand notes of the same Ferrière; a summary, in Spanish version, of the conference that with the same title it gave during his trip by Latin America, and an extensive article of the same Ferrière. Texto de la conferencia pronunciada por Adolphe Ferrière el día 5 de diciembre de 1930 en la inauguración del Seminario de Pedagogía de la Universidad de Barcelona. El texto, en versión catalana, ha sido traducido y reconstruido por Joan Soler Mata. La reconstrucción se ha hecho a partir de tres fuentes documentales: las notas manuscritas del mismo Ferrière; un resumen, en versión castellana, de la conferencia que con el mismo título dio durante su viaje por América Latina, y un extenso artículo del mismo Ferrière.
De la caractérisation matricielle des drapeaux complets d'extensions riemanniennes aux feuilletages riemanniens transversalement diagonaux sur une variété compacte connexe
Cyrille Dadi,Adolphe Codjia
Mathematics , 2014,
Abstract: In this paper we characterise with the matrix the complete flag of riemannian extension (see d\'efinition) on a riemannian compact manifold whose metric is bundlelike for any foliation F_{s} of this flag. This study show us that a foliation of a complete flag of riemannian extension on a riemannian compact manifold whose metric is bundlelike for any foliation of this flag is a transversely diagonal riemannian foliation (see d\'efinition).
Study of the Porosity of the Tiles out of Vibrated Mortar by Microstructural Analysis  [PDF]
Chakirou Akanho Toukourou, Gontrand Comlan Bagan, Adolphe D. Tchehouali, Alain Vautrin
Journal of Building Construction and Planning Research (JBCPR) , 2014, DOI: 10.4236/jbcpr.2014.22013
Abstract: The promotion and the popularization of the micro concrete tiles in any locality obligation with a will of durable development pass by a standard of quality, which is based on the results of scientific and technical research taking account of local specificities. This work proposes to study the porosity of the micro concrete by micro structural analysis. From this study, it comes out that the variation of porosity compared to the ratio of the fine gravels (s/(s + g)) is decreasing. Indeed more the granular ratio increases less low is the density of pores of material. The decrease of porosity according to the granular rate is not infinite; it tends towards a minimum starting from a rate of fine gravel close to 50%. The results obtained justify well the ratio of fine gravel practised by tileries.
An Unusual Intravesical Foreign Body for Abortion Attempt. About a Case Report at Bobo Dioulasso University Teaching Hospital (Burkina Faso) and Literature Review  [PDF]
Zaré Cyprien, Kambou Timothée, Sanon B. Gustave, Ouattara Adama, Traoré I. Alain, Paré Abdoul Karim, Somé D. Adolphe
Open Journal of Urology (OJU) , 2014, DOI: 10.4236/oju.2014.44006
Abstract:

We reported a case of an intravesical foreign body in a 16 years old teenager for abortion attempt. During laparotomy for suspected pelvic appendicitis, we incidentally discovered an intravesical foreign body. From this first observation in our urology division, we reviewed the literature on the nature and circumstance of self introduction in bladder of foreign body and their surgical ablation. We emphasized the importance of endoscopy as a support of diagnosis and therapeutic of intravesical foreign body. This observation also highlighted the lack of information in our teenagers about reproductive and sexual health.

Genetic Diversity of Maize Accessions (Zea mays L.) Cultivated from Benin Using Microsatellites Markers  [PDF]
Hafiz A. Salami, Kamirou Chabi Sika, Wilfrid Padonou, Djima Aly, Chabi Yallou, Adolphe Adjanohoun, Simeon Kotchoni, Lamine Baba-Moussa
American Journal of Molecular Biology (AJMB) , 2016, DOI: 10.4236/ajmb.2016.61002
Abstract: Maize (Zea mays L.) is the major cereal cultivated in Benin and it is important to know its genetic diversity to improve the yield. The genetic markers of important traits are evaluated in order to improve the maize inbred lines. The aim of this study was to evaluate the genetic diversity of Benin’s maize accessions by SSR marker. Thus, one hundred eighty seven maize accessions from three areas (South, Center and North) were analyzed using three SSR markers. A total of 227 polymorphic bands were produced and showed high genetic diversity (Shannon index = 0.51). The polymorphic information content (PIC) values for the SSR loci ranged from 0.58 to 0.81, with an average of 0.71. Genetic distance-based UPGMA dendrogram showed a genetic differentiation between accessions and they were grouped into four clusters in each area. This work provides necessary information that can be used not only to improve the maize production and conservation but also to better manage genetic species resources in Benin.
Statin-induced apoptosis via the suppression of ERK1/2 and Akt activation by inhibition of the geranylgeranyl-pyrophosphate biosynthesis in glioblastoma
Masashi Yanae, Masanobu Tsubaki, Takao Satou, Tatsuki Itoh, Motohiro Imano, Yuzuru Yamazoe, Shozo Nishida
Journal of Experimental & Clinical Cancer Research , 2011, DOI: 10.1186/1756-9966-30-74
Abstract: The cytotoxicity of statins toward the C6 glioma cells were evaluated using a cell viability assay. The enzyme activity of caspase-3 was determined using activity assay kits. The effects of statins on signal transduction molecules were determined by western blot analyses.We found that statins inhibited cell proliferation and induced apoptosis in these cells. We also observed an increase in caspase-3 activity. The apoptosis induced by statins was not inhibited by the addition of farnesyl pyrophosphate, squalene, ubiquinone, and isopentenyladenine, but by geranylgeranyl-pyrophosphate (GGPP). Furthermore, statins decreased the levels of phosphorylated extracellular signal-regulated kinase 1/2 (ERK1/2) and Akt.These results suggest that statins induce apoptosis when GGPP biosynthesis is inhibited and consequently decreases the level of phosphorylated ERK1/2 and Akt. The results of this study also indicate that statins could be used as anticancer agents in glioblastoma.Glioblastoma is the most common type of malignant brain tumor and its prognosis is very poor. Surgical resection and chemotherapy are common treatments [1]. Despite recent advances in the understanding of the molecular mechanism of tumorigenesis, the outcome of malignant glioma remains poor [2]. Thus, it is imperative that new effective forms of therapy are developed for its treatment.Statins are cholesterol-lowering agents that inhibit 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase, which catalyzes the conversion of HMG-CoA into mevalonate. Mevalonate is converted into farnesyl pyrophosphate (FPP) or geranylgeranyl pyrophosphate (GGPP) that can be anchored onto intracellular proteins through prenylation, thereby ensuring the relocalization of the target proteins in the cell membranes [3-5]. Inhibition of HMG-CoA reductase results in alteration of the prenylation of small G proteins such as Ras, which regulates cell growth and survival via the downstream signaling pathways [3-5]. Accordingly, in
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