bachir kerboua (989 résultats)

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Taschenbuch. Etat : Neu. Neuware -This work deals with the problem of optimization of the maintenance function. The objective is to identify the different equipments of the cement manufacturing process while looking for those that present the most critical failures. Then it consists in identifying the elementary organs of these equipments, especially the mill.We used the laws of reliability and analysis methods (FMECA and ABC) to focus on the equipment failures that cause the majority of the failure effects on maintenance, production and production quality. We followed up our work with an application of 'Weibull's Law'. The lifetime of the critical component is determined using a graphical, analytical and numerical method to determine the failure parameters, which are used for the evaluation of the equipment degradation rate and to determine the type of maintenance to be applied.Books on Demand GmbH, Überseering 33, 22297 Hamburg 84 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -In order to complete our training and improve our knowledge acquired at university level with the industrial reality of production units, an internship and an end-of-study dissertation to affirm our knowledge and acquire an industry mindset. This work includes a general study of the vertical axis centrifugal pump including the maintenance of this pump which is manufactured to convey fluids in the production and economic enterprises. To remedy this problem, we must start from the following definition of maintenance 'maintenance is production at optimal cost), we have tried to propose a maintenance plan (corrective and preventive). In order to improve the maintenance of the shipping pump, condition-based preventive maintenance is planned, using the pump analysis technique. The choice of this maintenance is justified by the vital role of the pump. This end-of-study internship allowed us to apply our theoretical knowledge acquired during our university course. In the end, we hope to be up to the task assigned to us.Books on Demand GmbH, Überseering 33, 22297 Hamburg 72 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -The phenomenon of corrosion of steel is a natural and artificial phenomenon caused by the use and exploitation of these metals.In the industrial and metallurgical sectors (automotive, construction, etc.), the surface of steel sheets is coated in order to protect them against corrosion attacks that occur, for example, during the storage of sheets or on vehicles (rain, de-icing salts.). On an industrial scale, two processes are mainly used to protect steels from corrosion: galvanization and electro-galvanization. However, the classical methods of protection are not sufficient and the total cost of corrosion reaches today 3 to 4 % of the world GDP.Most often, weaknesses in corrosion resistance are observed on hot-dip galvanized steels when they are stored for long periods in uncontrolled (and often corrosive) conditions. In addition, these steels have poor bonding properties, especially for steels coated with zinc on both sides.Existing coatings on metal surfaces are often insufficient for the protection of critical vehicle parts (doors, side rails, mud flaps.) and cut edges. They must then be completed by post-protections in order to increase the corrosion resistance of the whole.Books on Demand GmbH, Überseering 33, 22297 Hamburg 80 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -The industrial maintenance is of capital importance for the companies (group kherbouche) in order to ensure the good functioning of the tools of production at the level of department of exploitation, it is a strategic function in its companies. Our work establishes a strategy of maintenance to be applied in order to optimize the degradation of the machines at the level of the company 'Inter enterprise of the group Kherbouche', we use an approach of maintenance based on the reliability MBF.In this project, we used the methods of analysis and the laws of the reliability developed (ABC, AMDEC, Noiret) with an aim of focusing the efforts on the failures of the machines which cause the majority of the negative effects to the maintenance, the production. These techniques of the MBF consist not only in identifying the anomalies and the dysfunction but, it allows to establish functional analyses until their causes by the tool 'AMDEC'.one finalized the operation of analysis by an application of the law of 'Weibull', very known by its parameters, in order to determine the life span of the critical organ, by using the graphic and numerical method.Books on Demand GmbH, Überseering 33, 22297 Hamburg 92 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -This project is about the study of the performance of thermal diesel engines. We carried out an approach on the analysis of the failures of the diesel engines and an approach on the analysis of their performance. Our work was confronted with the reality of the problems at the practical level, in particular at the level of the company E.T.U.S.Tlemcen. Our work began with the definition of the concept of thermal engines and the degradations of the motor organs, particularly at the level of the company, as well as the causes which led to these failures. Following the degradation of engine components, we applied the performance analysis in order to determine the performance parameters of the engines and compare them with the practice (as an example, the studied diesel engine costs about one billion two hundred million cents).Books on Demand GmbH, Überseering 33, 22297 Hamburg 92 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -The objective of this thesis is to study and analyze the different injection systems of the gasoline engine and diesel engine, to know their types and their constituents, to understand their operation and the main elements that influence the fuel injection. Thus, to determine the various failures and anomalies that can meet the injection system of a diesel engine with direct injection to show the importance of the injection system within the engine. The failure in the system causes the malfunctioning of the engine is the failure of the injectors or the maladjustment of the injection pump, which negatively affects the performance of the engine and the combustion, and can cause an increase in the rates of exhaust gases (pollution).Finally, we have formulated the way to restore the injection system to normal operation by adjusting the injectors and the injection pump on a test bench and by calculating the parameters of the injection pump and the jet injected by the injectors.Books on Demand GmbH, Überseering 33, 22297 Hamburg 84 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -The aim of this work is to study the behaviour of galvanized steel and its resistance to corrosion and degradation.The investigations by the method of mechanical and electrochemical techniques, allowed us to follow the behavior of galvanized steel in two different situations.The results obtained showed that sodium chloride at 3% was more reactive to corrosion than protection by zinc alone. On the other hand, fresh water has no effect on galvanized steel due to the passivation of the galvanized layer with respect to the substrate (bare steel).It is concluded that zinc protection is favourable for pipes carrying fresh water, and specific protection for corrosion in active media.Books on Demand GmbH, Überseering 33, 22297 Hamburg 60 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -Industrial maintenance is becoming increasingly important and is one of the key functions of the modern production company.Our work is devoted to the theoretical and practical study of the reliability of the rolling stock at the level of the transport company 'E.T.U.S.T', in this case the industrial reliability based on advanced reliability methods.In our project we used the advanced reliability laws and analysis methods (PARETO and ABC) which are known in reliability, and in particular the 'Weibull' law. We have defined graphical and analytical methods to determine the reliability parameters, which are used for the evaluation of the degradation rate of the equipment of the park and to determine the type of maintenance to be applied.Finally, we validated our study by a practical application, by choosing the sensitive organs of the strategic equipment in the company. This study allowed us to improve the results in accordance with the practical reality at the company level by using an advanced calculation code.Books on Demand GmbH, Überseering 33, 22297 Hamburg 84 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -In Algeria, hydrocarbons play a very important role in the country's economic development. The increase of the oil rent, following the joint increase of the volumes produced and the price of hydrocarbons, has allowed an average growth of the GDP of 4% per year between 2001 and 2007.Because the decisions to be taken in the field of energy determine to a large extent the economic and social development of the country, the study aims to establish projections of consumption, production and export of oil and gas in Algeria by 2020-2030, in order to provide one of the challenges of energy policy, facing all the internal and external constraints (barrel price, economic growth, population growth, .).Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -Fresh water is a resource used in all economic activities (agricultural, industrial, domestic, energy, navigation, etc.) that can lead to sustainable development and a stable socio-cultural life. This resource is nowadays threatened by economic activity, demographic expansion, pollution, and climate change. In order to achieve sustainable economic and social development the adoption of integrated water resources management (IWRM), it is necessary to manage in a rational and balanced way, and to preserve water resources. This management aims to solve water problems in the countries and allow the integral and rational use of water in all sectors of activity. In Algeria, the adoption of IWRM makes it possible to meet the water needs of the population thanks to the supply policy established by the public authorities. The State has decided to reduce the water deficits of the population and to preserve water resources with the objective of sustainable development. Water management is ensured by public actors, which are the Ministry of Water Resources and the Water Resources Departments.Books on Demand GmbH, Überseering 33, 22297 Hamburg 76 pp. Englisch.

Taschenbuch. Etat : Neu. Neuware -Urban security is nowadays an issue of strategic importance. It contributes to the elaboration of solutions to the complex problems of the countries; it is a vector of economic and social progress, therefore it appears as the strategic axis that every institution must promote, develop and ensure to develop their cities and their own environments.Indeed, many associations existed with regard to the regulation to give a push and an urbanization to the Algerian cities but in reality they were not operational. The crisis of the 1990s, marked by political and economic instability and insecurity, was a blocking and braking factor for many associative movements. The lack of experience in the practice of association, the lack of motivation as well as the social and administrative burdens have also helped to make fictitious the existence of many associations that could help the development of the country.Books on Demand GmbH, Überseering 33, 22297 Hamburg 60 pp. Englisch.