The extraction of cobalt in the ore Kabolela, leads us to look for techniques and methods to extract a good amount of it (Cobalt) low cost without passing the gangue in the solution while minimizing costs . For this purpose to determine the leach parameters to recover the cobalt in the ore processed by the Company Kabolela BOSS MINING, we conducted experimental testing laboratory heap leach ore, preceded by size analyzes and granulochimiques different slices to determine the operating parameters can give satisfactory results. After collection, sifting and weighing of each particle size range for chemical analysis to determine the chemical distribution and know the slice that will allow good dissolution after leaching tests; we noticed that, in the same leaching time 48 hours, dissolution of metal in acid is a function of particle size. And to recover much of the metal, go to more than 48 hours and use a reducer solution to all Cobalt (divalent and trivalent).

Since a longtime, Africa has entered in the history: Negro slave trade, exploration time and colonial period. That reaping did not allow Africa to play on important role on international scene because Africa was considered like an object, non-like actor of internationals relations. Africa is hoping continent by his potentiality of economics, environment, even by his demography. Fault of less pawer of diplomacy, Africa is unable to impose his insertion on international scene. The mundialization is an opportunity for Africa to play a role in future in this multilateral world. That is the reason of our objective, to demonstrate that the regional integration is an appropriate technical for participation of Africa to sub African business and trade firstly and to international trade. For his success, his integration should start inside of states to create conditions of economics growth of African states. Industrialization should be one of conditions for economic recovery in Africa.

Using essential oils (EOs) in animal feed is not practical due to the instability and volatility of their components. This study was designed to stabilize thyme and oregano EOs in chitosan and Canarium charcoal to mitigate their volatile and oxidative ability in poultry feed. The dietary treatments consisted of control diet (R0); control diet supplemented with chitosan film forming solution containing 0.01% of a blend of thyme and oregano EOs (RTh+Or), 0.2% charcoal without EOs (Roc), chitosan film forming solution containing 0.01% of thyme EO entrapped with charcoal (Roc+Th), chitosan film forming solution containing 0.01% of oregano EO entrapped with charcoal (ROC+Or) and chitosan film forming solution containing 0.01% of a blend of thyme and oregano EOs entrapped with charcoal (ROC+Th+Or). The results revealed that the entrapped EOs has no significant effect on feed intake. Weight gain markedly (P<0.05) increased with the blend of entrapped EOs for about 20% and 8% respectively during starter (days 1 to 21) and grower (days 22 to 49) phases compared to the control diet. The lowest feed conversion ratio (FCR) was also recorded with the blended entrapped EOs. Feeding broilers with the EOs mixture markedly (P<0.05) increased lactic acid bacteria count compared to the pathogens counts in both the ileum and the Cæcum. The entrapped EOs markedly decreased serum content in aspartate aminotransferase (ASAT) and creatinin, and increased in total protein and albumin. Thyme and oregano EOs can be stabilized in chitosan and Canarium seeds charcoal for a better growth in broiler chickens.

The corrosion-inhibition efficiency of Pulegone and Pulegone oxide, and the corresponding protonated molecules have been studied computationally using density functional theory. The iron-inhibitor-iron complexes were constructed by interaction the heteroatom to the iron surface modeled by one iron atom. Relations between molecular properties and corrosion-inhibition efficiency were determined by using linear regression and quantitative structure–activity relationship (QSAR). The QSAR analysis yielded significant correlations between the corrosion-inhibition activity of the studied molecules with molecular properties such as the highest occupied molecular orbital, the lowest unoccupied molecular orbital, dipole moments, and the total atomic charges. Fukui indexes were also calculated for assessing correlation between them and experimental corrosion-inhibition efficiencies. The efficiency order of two inhibitors is found to be Pulegone >Pulegone oxide which accords with experimental results.

The problem of this study is represented by one main question: What is the effect of suggested educational software based on electronic reading activities in teaching grammatical concepts on the development of deductive thinking Skills of First Year Secondary Students? This main question includes the following minor questions: 1. What are the deductive thinking skills there are suitable for teaching grammatical concepts to first year high school students? 2. What is the form of the educational software based on electronic reading activities used in developing the deductive thinking skills in teaching grammatical concepts to first year high school students? 3. What is the effectiveness of the educational software based on electronic reading activities used in developing the deductive thinking skills in teaching grammatical concepts to first year high school students? The sample was consisted of 50 students' secondary school taken from Azza Zeidan experimental Language School and sports secondary school for Males and 50 Arabic language teachers and supervisors. The results indicated that: 1. There are statistically significant differences between the observed and expected frequencies of the marks of Arabic language teachers and supervisors and Specialists in methods of teaching Arabic language in the items of the questionnaire of the deductive thinking skills relevant for teaching grammatical concepts to first year high school students by using the educational software based on electronic reading activities as k2 test shows. 2. There are no statistically significant differences between the means of the experimental and control groups in the pre-test of deductive thinking skills of teaching grammatical concepts, students’ marks in the pre -test. 3. There are statistically significant differences between the means of students’ marks in the experimental and control groups in the post-test of deductive thinking skills of teaching grammatical concepts, students’ marks in the post-test.

La gestion des ordures ménagères constitue un problème majeur dans la ville de Bongor. Le présent travail aborde cette question sous plusieurs angles : les modes de gestion des ordures ménagères, le fonctionnement des structures de pré-collecte et les facteurs entravant une meilleure gestion des ordures ménagères. Pour atteindre les objectifs, des travaux de recherche ont été effectués, notamment des enquêtes auprès des ménages et des interviews au près des autorités compétentes. Aux termes de nos investigations, il en ressort que les pratiques populaires (rejet des ordures ménagères dans la nature, les incinérations et l’enfouissement) sont plus utilisés par la population interrogée, le manque de volonté des populations elles-mêmes, l’inexistence des structures de pré-collecte dans tous les quartiers de la ville de Bongor et le problème financier expliquent cette situation. Aussi les responsables du service de l’assainissement et la mairie de Bongor rencontrent d’énormes difficultés d’ordre financier et matériel. Ainsi, il n’existe pas encore un point de regroupement, les sites de décharge finale dans la ville de Bongor. Le système de la gestion se limite à la seule opération de pré-collecte qui, appliqué par la population elle-même sans aucune sensibilisation. Les facteurs entravant la gestion durable des déchets ménagers dans la ville de Bongor identifiés par l’étude sont caractérisés par des indices sévérités importants allant de 1,1 à 1,5.

This article presents the results of our study which focused on the identification of the specificities of the 3C relationships as well as the perception of these relations among the teachers of the Primary, Secondary and Professional Education (in EPSP) from the city province of Kinshasa / Democratic Republic of Congo (DRC). It is, here, a question of discovering the feasibility of a didactical study for the relationship to any elementary object of knowledge. To achieve this, we have been able to use a few theoretical approaches of the relationship to knowledge, mainly the anthropological approach, then the sociological approach, by organizing a didactical seminar based on 3C relationships. Considering that we are on a path of discovery of a unified theory of the relationship to knowledge for its didactical study, we held a conference which was followed by nine operational workshops (two from the Maternal Directorate, three from the Primary Directorate and three from the Secondary Directorate) and whose theme is "The relationship to knowledge as a stake in the teaching / learning process from a didactical perspective : 3C relationships", and this at the scholar Complex Ark of the Alliance “The Heirs of the promise” from the commune of Kinshasa / Masina (DRC).

The social and economic changes successive escort Contemporary Arab world have led to the need for activating the social role of the fine arts and applied in integration to elevate public taste for popular environment and confirm the identity and contribute to the achievement of sustainable development pursued by our societies. So is flying this research to study and analyze the philosophical and aesthetic dimensions in the filming of the popular environmental "area of Imbaba," as a source of inspiration in the design and printing of textiles to activate the concepts of sustainable development.

The aim of this research is to prepare an innovative teaching unit for draping on the mannequin (2) course to improve the students skills in renewing the used evening clothes by draping on the mannequin technique. And measure the efficiency of innovative unit on the Performance skills for (24) students (level 8) belong to the Department of Fashion Design , Arts and Design faculty. The research followed the applied approach. The tools consisted of an exploratory questionnaire on the method of students in the purchase of evening clothes before applying the innovative unit, the performance skill test (before and after), Performance evaluation Scale, questionnaire explore the student's opinions towards the innovative unit. The results show the effectiveness of the innovative unit and the presence of statistically significant differences between the average grades of students in the performance skill for the benefit of the post-application. Also The results indicate that the students' opinions are positive towards the innovative educational unit.

Background: HIV infection continues to wreak havoc around the world. Women are not spared, especially pregnant women, with low levels of education or information, transmitting HIV to their children. This study aims to assess the level of knowledge of women in reproductive age on the prevention of mother-to-child transmission of HIV / AIDS in the AFIA-Sake health area in the Democratic Republic of Congo. Method: This study is descriptive, involving 315 women aged 15-49 years from the AFIA-SAKE health area. The data collected by questionnaire were checked, captured and analyzed. The frequency of observations was calculated and the proportions were compared for accuracy when the CI was 95%. Results: The study shows that only 10% of women are aware of the prevention of mother-to-child transmission of HIV. Antenatal consultation is the excellent channel of communication. Among the women interviewed on antiretrovirals, 56% do not know when they will be given to pregnant women diagnosed with HIV; 63% do not know the value of administering antiretrovirals and 78% do not know when antiretrovirals will be given to the newborn. Conclusion: Achieving the goal of sustainable development for an HIV-free generation, with zero new infections in children and no HIV-related deaths, involves informing women of reproductive age about the prevention of mother-to-child transmission. HIV child through increased enrollment of girls, introduction of sex education as well as information on HIV in schools and antenatal clinics.