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Search Results: 1 - 10 of 5584 matches for " Bernard Nana "
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Characterization and Potential Recovery of Household Solid Waste in the City of Ouagadougou (Burkina Faso)  [PDF]
Kayaba Haro, Issoufou Ouarma, Bernard Nana, Antoine Bere, Jean Koulidiati
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.94021
Abstract: This study on physical and physicochemical characteristics of household solid waste (HSW) in the city of Ouagadougou by using MODECOM, “Method of Characterization of Household waste” was done fifteen (15) years after the first study. Special attention has been paid to waste sampled and also to estimate energy content, namely the higher heating value (HHV) and the lower heating value (LHV). As a general tendency, the results showed a sensitive evolution in the physical parameters of waste (composition by size and composition by category) and also in the physicochemical parameters (moisture content and energy content). The results of HSW composition study showed that regardless the seasons, fermentable fraction is dominant (39% in the rainy season and 20% in the dry season) followed by plastics (18% in the rainy season and 20% in the dry season). The moisture content is measured to be 56.69% and 37.69% respectively in the rainy season and dry season. The results analysis of the potential of recovery showed that the organic recovery is more important (60% in the rainy season and 55% in the dry season) than the matter recovery (43% in the rainy season and 46% in the dry season). These results highlight the need for organic recovery and matter recovery of HSW in the city of Ouagadougou. The results from the analysis of the energy content showed that the HHV is estimated to be 17.94 MJ/kg in the rainy season and 17.96 MJ/kg in the dry season. The LHV is calculated to be 6.38 MJ/kg in the rainy season and 10.27 MJ/kg in the dry season. These results suggest that incineration as treatment of HSW in the city of Ouagadougou is not economically an appropriate option.
Simulation and Evaluation of Dust Emission with Polair3D-SIREAM Model over West Africa Focused on Ouagadougou (Burkina Faso)  [PDF]
Bernard Nana, Oumar Sanogo, Issoufou Ouarma, Antoine Béré, Jean Koulidiati
Journal of Environmental Protection (JEP) , 2019, DOI: 10.4236/jep.2019.101006
Abstract: The study of air pollution is recent in West Africa. There is a lack of data on air pollution. However, some studies conducted in West Africa show that air quality is a concern. Population growth and massive vehicles imports are contributing to the deterioration of this air quality. In this work, we present the modelling of desert aerosols using a CTM Polair3D-SIREAM. The objective is to evaluate the ability of Polair3D-SIREAM to reproduce observations of PM10 and Aerosol Optical Thicknesses (AOT). A simulation with Polair3D-SIREAM was carried out in West Africa, focused on Ouagadougou (Burkina Faso) for 2007. The model of Marticorena and Bergametti (1995), MB95, was used to estimate desert aerosols emissions. The total emission of dust modelled is 52.2 Tg. For the evaluation of PM10, the simulated averages remained within the same orders of magnitude as the observed averages. Correlations are low in all the observation sites. The other indicators are similar to those found by Schmechtig et al. (2011). Performance criteria of Boylan and Russel (2006) are met for the observation sites of Ouagadougou and Ilorin (Nigeria). For the AOTs, the correlations are significantly improved, in particular, at the sites of Ouagadougou and Ilorin. Performance criteria of Boylan are met for all observation sites. However, the performance goals are only achieved for Ouagadougou and Ilorin.
Strong Local Non-Determinism of Sub-Fractional Brownian Motion  [PDF]
Nana Luan
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.613194
Abstract: Let \"\" be a subfractional Brownian motion in \"\" . We prove that \"\" is strongly locally nondeterministic.
Reasons, Consequences and Solutions to Anti-Business Logic Behavior of State-Owned Enterprises Controllers  [PDF]
Nana Zhang
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.88119
Abstract: Focusing on the anti-business logic behavior of state-owned enterprises controllers, this paper finds that the behavior is characterized by lack of cost constraints, control of commodity prices to make it lower than market equilibrium price, stressing on scale while neglecting efficiency, etc., which causes consequences of overcapacity in some state-owned enterprises, zombie enterprises, the loss of state-owned assets, financial burdens for the state, and unequal market status for private enterprises. Finally, the paper puts forward effective solutions.
Probabilistic Fuzzy Regression Approach from the Point of View Risk  [PDF]
Nana Gao, Qiujun Lu
Journal of Data Analysis and Information Processing (JDAIP) , 2018, DOI: 10.4236/jdaip.2018.64010
Abstract: Fuzzy regression analysis is an important regression analysis method to predict uncertain information in the real world. In this paper, the input data are crisp with randomness; the output data are trapezoid fuzzy number, and three different risk preferences and chaos optimization algorithm are introduced to establish fuzzy regression model. On the basis of the principle of the minimum total spread between the observed and the estimated values, risk-neutral, risk-averse, and risk-seeking fuzzy regression model are developed to obtain the parameters of fuzzy linear regression model. Chaos optimization algorithm is used to determine the digital characteristic of random variables. The mean absolute percentage error and variance of errors are adopted to compare the modeling results. A stock rating case is used to evaluate the fuzzy regression models. The comparisons with five existing methods show that our proposed method has satisfactory performance.
Effects of Teachers Level of Education and Experience on Teacher-Child Interactions in Early Childhood Institutions  [PDF]
Nana Yaa Nyarko, Hillar Addo
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.411131

Early childhood care and development (ECCD) in Ghana have received attention in the lat decade. To ensure quality of instruction and build capacity of early childhood teachers and caregivers, the National Nursery Teachers’ Training Centre was set up by the government to offer specialized training in nursery education for teachers and nursery attendants. Universities and the Colleges of Education have been mandated to train teachers for early childhood education. This study therefore sought to find out the effects of level of education and years of experience of teachers on their interactions with children (3 - 5) in early-childhood institutions in Ghana using the Caregiver Child Interaction Scale (r = 0.77). The sample (N = 103; Female 99%): made up of teachers from thirty-one preschools in the Greater Accra Region of Ghana were observed during their normal classroom routine. There appeared not to be any statistically significant difference between the teachers’ level of education and years of experience on the interaction scores.

Generalization of the Global Error Minimization for Constructing Analytical Solutions to Nonlinear Evolution Equations  [PDF]
Serge Bruno Yamgoué, Bonaventure Nana
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.39142
Abstract: The global error minimization is a variational method for obtaining approximate analytical solutions to nonlinear oscillator equations which works as follows. Given an ordinary differential equation, a trial solution containing unknowns is selected. The method then converts the problem to an equivalent minimization problem by averaging the squared residual of the differential equation for the selected trial solution. Clearly, the method fails if the integral which defines the average is undefined or infinite for the selected trial. This is precisely the case for such non-periodic solutions as heteroclinic (front or kink) and some homoclinic (dark-solitons) solutions. Based on the fact that these types of solutions have vanishing velocity at infinity, we propose to remedy to this shortcoming of the method by averaging the product of the residual and the derivative of the trial solution. In this way, the method can apply for the approximation of all relevant type of solutions of nonlinear evolution equations. The approach is simple, straightforward and accurate as its original formulation. Its effectiveness is demonstrated using a Helmholtz-Duffing oscillator.
-Estimates of the Bergman projection in the Lie ball of
Cyrille Nana
Journal of Function Spaces and Applications , 2011, DOI: 10.1155/2011/291620
Abstract: In this paper, we consider estimates with loss for the Bergman projections of bounded symmetric domains of ℂn in their Harish-Chandra realizations. This paper is twofold: on one side we develop transfer methods between these bounded domains and their Cayley transform; on the other side we give a new range of q such that the Bergman projection is bounded from L∞(ℬn) to Lq(ℬn) where ℬn is the Lie ball of ℂn.
-Estimates of the Bergman projection in the Lie ball of
Cyrille Nana
Journal of Function Spaces , 2011, DOI: 10.1155/2011/291620
Abstract: In this paper, we consider estimates with loss for the Bergman projections of bounded symmetric domains of ? n in their Harish-Chandra realizations. This paper is twofold: on one side we develop transfer methods between these bounded domains and their Cayley transform; on the other side we give a new range of q such that the Bergman projection is bounded from L ∞ ( ? n ) to L q ( ? n ) where ? n is the Lie ball of ? n .
Hilbert Huang Transform for Predicting Proteins Subcellular Location  [PDF]
Feng SHI, Qiujian CHEN, Nana LI
Journal of Biomedical Science and Engineering (JBiSE) , 2008, DOI: 10.4236/jbise.2008.11009
Abstract: Apoptosis proteins have a central role in the development and homeostasis of an organism. These proteins are very important for the understanding the mechanism of programmed cell death, and their function is related to their types. The apoptosis proteins are categorized into the following four types: (1) Cytoplasmic protein; (2) Plasma membrane-bound protein; (3) Mitochondrial inner and outer proteins; (4) Other proteins. A novel method, the Hilbert-Huang transform, is applied for predicting the type of a given apoptosis protein with support vector machine. High success rates were obtained by the re-substitute test (98/98=100%), jackknife test (91/98 = 92.9%).
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