In this article we propose to analyze the factors of the locations of service stations and their impact in the spatial organization of the city of Lubumbashi. We have adopted the descriptive explanatory method; Using a GPS, the service stations were located. The quadrat method allowed us to highlight the spatial model of the city and the Quantum Geographic Information System (QGIS) software enabled us to develop the service station map. After analysis of the quadrat and the map we deduced the following: intense places of activity (business center); The major roads and intersections attract more petroleum operators to establish service stations within the city. Affordable price; The quality of the petroleum product; Proximity to the road; The speed of delivery of petroleum products attracts customers to service stations. Their environmental impacts have been elucidated and the risks associated with their radiation are great because they have no buffer zones and their reconciliation is a permanent fire hazard in a city where fire fighting vehicles are almost non-existent. Where the town hall has a responsibility for regulating points of sales of petroleum products in order to save human and material lives.

Diabetes has become one of the main causes disability and death in the world; it’s part of the main risks of blindness and kidness faiture diabetes is the basis of leg amputation and cardiovascular disease. The purpose of this study is to identify the characteristics of type two diabetes in Lubumbashi city and to understand what would be the etiology of this disease. People with diabetes are vulnerable to potentially disabling and deadly health problems. Bay way causes of illustration chronic hyperglycemia cause neuropathy, retinopathy and nephropathy etc. Lipid peroxidation is the basics of the increased risk of cardiovascular disease in type two diabetics’ patients. This study consists to characterize diabetes by measuring blood glucose, cholesterol, triglycerides, height density lipoprotein-cholesterol, low density-cholesterol, L’aspartate aminotransférase and Alanine amino transférase assayed on a VISUAL ANALYZER (model : VISUAL/60VB0357,N°series : 1553, maker : SECOMAMCE) ; it’s also prospective. As for distribution the number of diabetics comes from Lubumbashi and katuba ships, it represents 25% of our sample and presents a dyslipidemia; it is highly correlated with insulino durability and hperinsulenemia.

A mathematical modeling of Hepatitis C Virus (HCV) dynamics has been presented in this paper. The proposed model, which involves four coupled ordinary differential equations, describes the interaction of target cells (hepatocytes), infected cells, infectious virions and non-infectious virions. The model takes into consideration the addition of ribavirin to interferon therapy and explains the dynamics regarding biphasic and triphasic decline of viral load in the model. A critical drug efficiency parameter has been defined and it is shown that for efficiencies above this critical value, HCV is eradicated whereas for efficiencies lower this critical value, a new steady state for infectious virions is reached, which is lower than the previous steady state.

We show in this study, an economist and a manager must be able to explain and predict economic trends and also understand the relationships that influence (production, consumption and distribution) that the business may suffer and could revive in the future. Linear regression was for us, a way that could give us a simple model to measure the impact of characteristics of a dependent variable on one or more well-defined variables; So an economic variable that explains the behavior of observed economic variables that influence the observed economic situation. If the economic situation does not allow admitting a linear regression model, we can transform the whole time in a linear model by appropriate methods and techniques. Hence it is easy to study the model as if it were a linear model in order to estimate the parameters to explain, understand and predict the future of the measured economic phenomenon. In this study, we use the experimental method which we analyze in four steps: - Definition of econometrics and some general notions of econometrics. - Definition of the model and to estimate the parameters. - Statement of assumptions and properties of the method used to estimate the parameters. - Make the judgment tests on the quality of the regression. And the technique is the method of ordinary least square to estimate model parameters.

Sustainability and economic efficiency in corn production could increase by the integrated weed management to a tolerable level. A study was conducted at the Kasapa farm during the 2013-2014 crop year to assess growth, grain yield of two improved varieties of maize (UNILU and Bukidi-Bukidi) and production economics Starting from two modes of weeding (manual weeding hoe and chemical weeding) and 4 weed management alternatives: {Weeding Manual (TO), 3l / ha atrazine (T1), 3l / ha acetochlor (T2), 6l / ha atrazine and acetochlor mixture (T3)}. The results revealed that the two varieties were similar height perspective of seedlings and yield. Six species have been recorded, but only two species (Setaria pumila and Cyperus rotundus) were resistant to their presence in all plots. Compared to weed management practices, performance culture has evolved as follows: T2> T3> T1> T0.Cependant an acceptable economic return was obtained with 3l / ha acetochlor. To intensify maize production in the study area, the mixture of acetochlor and atrazine is Discourage while adoption of acetochlor requires an extension on these modes.