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Search Results: 1 - 10 of 3055 matches for " Cokou Pascal Agbangnan "
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Evaluation of the Opuntia dillenii as Natural Coagulant in Water Clarification: Case of Treatment of Highly Turbid Surface Water  [PDF]
Yéwêgnon Alima Esther Irma Nougbodé, Cokou Pascal Agbangnan, Alain Yaya Koudoro, Comlan Achille Dèdjiho, Martin Pépin A?na, Daouda Mama, Dominique Codjo Koko Sohounhloué
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.512133

This study was performed in laboratory scale and consisted of the using of aqueous Opuntia dillenii solution for the clarification of very turbid surface water (Turbidities varying between 186 NTU and 418 NTU). This plant from Cactaceae family was used as a natural coagulant for the different clarification tests. The preliminary phytochemical Screening of the powder of this plant showed that it contains tanins, saponins and mucilages. Flocculation and coagulation tests showed that Opuntia dillenii can be used in highly turbid water treatment. The removal efficiency varied from 89% to 93% for the turbidity and suspended solids, and from 4% to 15% for the obvious color in water when we used the optimum values of this natural coagulant (1 mL to 10 mL). The successive addition of this natural coagulant and the lime, gave a better elimination of turbidity and suspended solids, and a good reduction for the color. The removal efficiency of the turbidity and suspended solids became more than 95% and the one of the color between 67% and 94%.

Phytochemical Study and Evaluation of Cytotoxicity, Antioxidant and Hypolipidemic Properties of Launaea taraxacifolia Leaves Extracts on Cell Lines HepG2 and PLB985  [PDF]
Omédine Koukoui, Pascal Agbangnan, Sylviane Boucherie, Mahudro Yovo, Oliver Nusse, Laurent Combettes, Dominique Sohounhloué
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.611177
Abstract: Launaea taraxacifolia is a leafy vegetable of the family of Asteraceae (Compositae) found in several countries in West Africa including Ghana, Benin and Nigeria. The plant leaves are eaten either fresh as salad or cooked as sauces. They are also consumed as infusion to fight against several diseases including non-communicable diseases such as diabetes and hypertension. Several studies have been conducted in Ghana, Nigeria on the nutritional and medicinal values of this plant but no study has yet been conducted in Benin on the virtues of this plant. In this work we have achieved the phytochemical characterization and evaluated the cytotoxicity as well as hypolipidemic and anti-oxidant effects of the ethanol-aqueous extracts of Launaea taraxacifolia leaves. Cytotoxicity and hypolipidemic activities have been performed on HepG2 cells; the antioxidant effect has been performed on the PLB985 cells. The results showed that the ethanol-aqueous extracts of Launaea taraxacifolia leaves contained the following metabolites: catechic tannin, flavonoids, phenolic acids, mucilage and leucoanthocyanins. Only very high concentrations (>20 mg/ml) of leaves extracts are toxic for HepG2 cells. Launaea taraxacifolia leaves have significant antioxidant and hypolipidemic activities.
The End of Voters in Europe? Electoral Turnout in Europe since WWII  [PDF]
Pascal Delwit
Open Journal of Political Science (OJPS) , 2013, DOI: 10.4236/ojps.2013.31007

Over the past twenty years, the scientific community and politicians in consolidated democracies have been regularly alarmed by political and electoral participation, portrayed as undergoing a brutal and linear decline. Each election is now scrutinized in terms not only of its results but also of its level of electoral turnout. This paper deals with two important issues—the reality of changes in electoral turnout in Europe and the impact of the institutional constraint of compulsory voting in voter turnout levels—through an analysis of 402 elections held in thirty-five States from 1944 until December, the 31st 2009. We do observe a contemporary erosion of voter turnout but at this stage voters are not so impossible to find as some claim they are. Furthermore, the assumption that interest in, and the importance of, compulsory voting as an institutional constraint encouraging voter turnout is confirmed.


The Catastrophe Map of a Two Period Production Model with Uncertainty  [PDF]
Pascal Stiefenhofer
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.48A016

This paper shows existence and efficiency of equilibria of a two period production model with uncertainty as a consequence of the catastrophe map being smooth and proper. Its inverse mapping defines a finite covering implying finiteness of equilibria. Beyond the extraction of local equilibrium information of the model, the catastrophe map renders itself well for a global study of the equilibrium set. It is shown that the equilibrium set has the structure of a smooth submanifold of the Euclidean space which is diffeomorphic to the sphere implying connectedness, simple connectedness, and contractibility.

Topological Properties of the Catastrophe Map of a General Equilibrium Production Model with Uncertain States of Nature  [PDF]
Pascal Stiefenhofer
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.517259
Abstract: This paper shows existence and efficiency of equilibria of a production model with uncertainty, where production is modeled in the demand function of the consumer. Existence and efficiency of equilibria are a direct consequence of the catastrophe map being smooth and proper. Topological properties of the equilibrium set are studied. It is shown that the equilibrium set has the structure of a smooth submanifold of the Euclidean space which is diffeomorphic to the sphere implying connectedness, simple connectedness, and contractibility. The set of economies with discontinuous price systems is shown to be of Lebesgue measure zero.
A New Interpretation of the Hubble Law  [PDF]
Pascal Churoux
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.69127
Abstract: We propose a new interpretation of Hubble law. Waves are observed in the observer space-time. It defines the observer proper time T. Space-time is composed of three spatial dimensions and three temporal parameters: proper-time s of the observed object, proper time T of the observer and integration time t (currently considered as relative time). Time origin is the birth of the universe. So, universe is stable; it can be seen as the comobile space of expansion theory. When changing space-time from the source to the observer, waves are seen cooling; this explains the redshift effect. The distance is defined as the product of the delay time with the local speed of light of the observer. The mistake between t and T can explain why universe is viewed as not only in expansion but also in acceleration whereas we think it is stable.
Production in General Equilibrium with Incomplete Financial Markets  [PDF]
Pascal Stiefenhofer
Journal of Mathematical Finance (JMF) , 2016, DOI: 10.4236/jmf.2016.62025
Abstract: This paper considers a general equilibrium model with incomplete financial markets where production sets depend on the financial decisions of the firms. In the short run, firms make financial choices in order to build up production capacity. Given production capacity firms make profit maximizing production decisions in period two. We provide the conditions of existence of equilibria.
The Relativity of Cosmic Time: The Universe Is a Black Hole  [PDF]
Pascal Churoux
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.613188
Abstract: Up to now, cosmology metrics have been based on Einstein relativity, established in 1905. Hubble has discovered the correlation between redshift and distance. Cosmology interprets the redshift as an expansion effect a(t) through the ΛCDM model. We have proposed a new theory to explain Hubble law. The theory has been validated against observation data. It proposes a new approach of time which introduces the cosmic time tc. Cosmic time is an absolute reference to universe. It is zero at the edge with tc = 0, tc = T at the observer position and tc = s for any source between the edge and the observer, with T > s > 0. This theory acts like the relativity of space-time. The redshift is interpreted as a perspective parameter p(tc) = tc/T. Using gravitation, it is the Einstein effect applied to the uni-verse. This paper comments and interprets further consequences of this new theory. We emphasize the difference between duration (as usually used in classical cosmologic metrics) and the cosmic time tc as a notion of date. It induces two related effects: relativity of speed of light and time stretching. We explain why the cosmological standard model is not well suited to describe the Hubble law, to describe the universe. We also explain why gravitation and temperature increase when going from the center to the edge of the universe, when going from present to birth. The model has no use of black energy. As a consequence, the universe is seen as a black hole created by the cosmic time shock wave when tc = 0.
Existence of Financial Equilibria in a General Equilibrium Model with Piece-Wise Smooth Production Manifolds  [PDF]
Pascal Stiefenhofer
Journal of Mathematical Finance (JMF) , 2017, DOI: 10.4236/jmf.2017.73035
Abstract: This paper considers a general equilibrium model with production and uncertainty. It is postulated that the firm finances its production capacity through the stock market and that its operational costs are covered through revenues. It is assumed that firms have linear technologies exhibiting constant returns to scale. Their production sets are piece-wise smooth convex manifolds. By method of regularization, it is shown using transversally theory that financial equilibria exists.
Belgian Communism in the Light of Its Vanishing (1976-1994)  [PDF]
Pascal Delwit
Open Journal of Political Science (OJPS) , 2018, DOI: 10.4236/ojps.2018.83023
Abstract: In the 1987 national elections, the Communist Party of Belgium (PCB-KPB) lost all parliamentary representation for the first time since 1925. This failure reflects the accelerated collapse of Belgian Communism in just a decade. The events of 1989 and 1991 in Central and Eastern Europe and in the USSR will then confirm the de facto disappearance of the PCB-KPB. The article goes back to the roots of the decline of a medium-size Communist Party, but showed political and social relevance from 1925 to 1985. The decline is due to the industrial and socio-demographic dramatic changes. The paper also tackles the political choices made in the seventies and eighties to understand it. In particular, it embraces the internal paralysis of the party faced with the challenges posed to all the European Communist Parties at this time, and its inability to deal with them.
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