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Search Results: 1 - 10 of 443 matches for " Aly Tembely "
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Etiological Aspects of the Dilatation of the Upper Urinary Tract at University Hospital of Gabriel Toure  [PDF]
Amadou Kassogué, Mamadou Tidiani Coulibaly, Zanafon Ouattara, Adama Yaflé Diarra, Aly Tembely
Open Journal of Urology (OJU) , 2018, DOI: 10.4236/oju.2018.87022
Abstract: Introduction: The dilatation of the upper urinary tract, signs in the vast majority of cases the presence of a ureteral obstacle. The etiologies are diverse. Mali is a country where urinary schistosomiasis is endemic. Repeated infestation may result in long-term ureteropelastic dilatation secondary to stenotic sequelae. The objective is to study the causes of dilatations of the upper urinary tract. Materials and Methods: This is a prospective study of 12 months, from October 2010 to September 2011, performed in the urology department of Gabriel Toure University Hospital in Bamako. The parameters studied were: age, sex, reason for consultation, medical history, urinary analysis, etiological diagnosis, management, evaluation of renal failure. Result: In 12 months, we collected 50 cases of dilatations of the upper urinary tract representing 0.66% of all consultations. The average age of our patients was 35 years old. The sex ratio was 2.13 in favor of men. A history of urinary schistosomiasis was found in 25 patients or 50%. Low back pain was the most common reason for consultation, 76%. The renal and bladder ultrasonography performed in all 50 patients in our series found bilateral dilatation in 68% of patients and unilateral dilation in 32% of cases. Urinary tract infection with Escherichia coli was found in 53% of cases. Ureterovesical reimplantation was performed in 40% of cases. Conclusion: The dilatation of the upper urinary tract, consequence of an anatomical or functional obstruction, constitutes a rather frequent pathology and constituted 10% of the surgical acts of our service. Etiologies are diverse: congenital and acquired. Open surgery gives good results, but the introduction of innovative minimally invasive surgical technique is necessary.
Spatial Inhomogenity Due to Turing Instability in a Capital-Labour Model  [PDF]
Shaban Aly
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.32027
Abstract: A cross-diffusion system is set up modelling the distribution of capital and labour over the land of two identical patches (cites, markets or countries) in which the per capita migration rate of each species (investment capital or labour force) is influenced not only by its own but also by the other one’s density, i.e. there is cross-diffusion present. Numerical studies show that at a critical value of the bifurcation parameter the system undergoes a Turing bifurcation and the cross-migration response is an important factor that should not be ignored when pattern emerges.
The China-Africa Relations: Between the Development Cooperation and Economic Diplomacy  [PDF]
Maiga Aly
Open Journal of Political Science (OJPS) , 2019, DOI: 10.4236/ojps.2019.92016
Abstract: A spectacular ascent having made it possible to move from a continental economy to external influences to one of the greatest trading powers of the world, China has, in a few years debunked all the dogmas that wanted an economy initially low can very easily gain access to economic supremacy. The reform of its economy, begun in 1978 under the impetus of the Government of Deng Xiaoping and later its accession to the World Trade Organization, allowed the gradual opening of the country to the international markets and generated phenomenal growth which occurred thereafter. However, relations between China and Africa date back to the years 1960. Very early on, China developed diplomatic contacts with these African countries. China has in fact supported the newly independent African countries and has actively participated in consolidating local liberation movements in logic of anti-colonization. In Africa, since the period of socialist regimes, China has Darcy its aid in the construction of industrial fabric in some African countries and the development of production plants. These contacts between China and the African countries have succeeded, over the course of the political regimes, in developing a partnership and a particularly strong bilateral relationship. China continues to carry out major construction projects in Africa. China provides non-cost-specific loans to African countries and in return, it receives raw materials for its needs. It floods African markets with products with dubious quality and at the same time responds to African emergencies. It is therefore indispensable for the African countries affected by Chinese character and China to analyse the consequences, both positive and negative for the growth and development of their respective countries.
The Contribution of the Subregional Organizations to the Politics of Integrated Water Ressource Management: Case of the Niger Basin Authority (NBA)  [PDF]
Maiga Aly
Open Journal of Political Science (OJPS) , 2019, DOI: 10.4236/ojps.2019.92015
Abstract: The Niger Basin Authority (NBA) is a subregional organization shared by nine countries of West Africa and the center (Benin, Burkina, Ivory Coast, Cameroon, Guinea, Mali Niger, Nigeria and Chad). The politics of the Niger River water management always remains actuality to reach the objectives of sustainable development. The stakes of the Niger river water resource management are important, because they present themselves in terms of health, food, socio-economic, financiers, environmental, politics and géopolitics. From where the necessity to adopt the IWRM (Integrated Water ResourcesManagement) as a means of sustainable management. It is therefore essential to go through the diagnosis of all the problems related to this water resource in the Niger basin and to make the promotion of a rational and sustainable management, in order to ensure fairness between the different users, a healthy water, the durability of water resource and the fairness of the system; while facilitating the political, social and economic integration between the member states with development perspectives wthin the framework of the shared vision.
Synthesis, Characterization and Utilization of Starch Hydroxypropyl Sulphate for Cationic Dye Removal  [PDF]
Aly A. Hebeish, Amal A. Aly
International Journal of Organic Chemistry (IJOC) , 2014, DOI: 10.4236/ijoc.2014.43024
Abstract: The best conditions for synthesis of starch hydroxypropyl sulphate as per the dry method were firstly established. This was done through a thorough investigation into factors affecting the synthesis including concentrations of both the NaOH catalyst and the 2-hydroxy-3-chloropropyl sulphate along with duration and temperature of the reaction. The resultant newly synthesized 2-hydroxy-3-chloropropyl sulphate was then reacted with starch to obtain starch hydroxypropyl sulphate ultimately. After being characterized by making use of IR spectroscopy analysis and scanning electronic microscope, the starch hydroxypropyl sulphate samples were submitted to evaluation for cationic dye removal using Methylene Blue (MB). Cationic dye removal was studied under a variety of conditions. Factors involved encompass initial dye concentration, duration, sulphur %, pH and adsorbent dose. 100% dye removal could be achieved under certain conditions which were described in the text.
Monte Carlo Method for Physically-Based Drop Size Distribution Evolution
Moussa Tembely,Christian Lecot,Arthur Soucemarianadin
Lecture Notes in Engineering and Computer Science , 2009,
Theoretical Study of a New Spray On Demand Print-Head
Moussa Tembely,Christian Lecot,Arthur Soucemarianadin
Lecture Notes in Engineering and Computer Science , 2008,
New Periodic Solitary Wave Solutions for a Variable-Coefficient Gardner Equation from Fluid Dynamics and Plasma Physics  [PDF]
Mohamed Aly Abdou
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.14040
Abstract: The Gardner equation with a variable-coefficient from fluid dynamics and plasma physics is investigated. Different kinds of solutions including breather-type soliton and two soliton solutions are obtained using bilinear method and extended homoclinic test approach. The proposed method can also be applied to solve other types of higher dimensional integrable and non-integrable systems.
PID Parameters Optimization Using Genetic Algorithm Technique for Electrohydraulic Servo Control System  [PDF]
Ayman A. Aly
Intelligent Control and Automation (ICA) , 2011, DOI: 10.4236/ica.2011.22008
Abstract: Electrohydraulic servosystem have been used in industry in a wide number of applications. Its dynamics are highly nonlinear and also have large extent of model uncertainties and external disturbances. In order to increase the reliability, controllability and utilizing the superior speed of response achievable from electrohydraulic systems, further research is required to develop a control software has the ability of overcoming the problems of system nonlinearities. In This paper, a Proportional Integral Derivative (PID) controller is designed and attached to electrohydraulic servo actuator system to control its angular position. The PID parameters are optimized by the Genetic Algorithm (GA). The controller is verified on the state space model of servovalve attached to a rotary actuator by SIMULINK program. The appropriate specifications of the GA for the rotary position control of an actuator system are presented. It is found that the optimal values of the feedback gains can be obtained within 10 generations, which corresponds to about 200 experiments. A new fitness function was implemented to optimize the feedback gains and its efficiency was verified for control such nonlinear servosystem.
Optimization of Desiccant Absorption System Using a Genetic Algorithm  [PDF]
Ayman A. Aly
Journal of Software Engineering and Applications (JSEA) , 2011, DOI: 10.4236/jsea.2011.49061
Abstract: Optimization of the open absorption desiccant cooling system has been carried out in the present work. A finite difference method is used to simulate the combined heat and mass transfer processes that occur in the liquid desiccant regenerator which uses calcium chloride (CaCl2) solution as the working desiccant. The source of input heat is assumed to be the total radiation incident on a tilted surface. The system of equations is solved using the Matlab-Simulink platform. The effect of the important parameters, namely the regenerator length, desiccant solution flow rate and concentration, and air flow rates, on the performance of the system is investigated. In order to optimize the system performance, a genetic algorithm technique has been applied. The system coefficient of performance COP has been maximized for different design parameters. It has been found that the maximum values of COP could be obtained for different combinations of regenerator length solution flow rate and air flow rate. Therefore, it is essential to select the design parameters for each ambient condition to maximize the performance of the system.
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