bachir kerboua (415 Ergebnisse)

Zustand: New.

Taschenbuch. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: 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. Zustand: 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.

Taschenbuch. Zustand: Neu. Neuware -Energy issues are at the center of many of the countries' challenges. The region is characterized by a heavy reliance on oil and natural gas to meet its energy needs. Despite being major energy producers, many MENA countries are struggling to meet the growing domestic energy demand. The transition to renewable energy systems therefore represents a promising strategy for meeting this demand. The transition would also contribute to reducing greenhouse gas (GHG) emissions under the International Agreement on Limiting the Rate of Pollution. In addition, the use of renewable energy would boost economic growth and local employment and reduce fiscal constraints.These multi-level energy and political challenges, resulting from the interaction of economic, social, cultural and climatic aspects, should not be ignored, as they pose serious risks to prosperity and economic and social development, and hence to the stability of urbanization in the cities and the region.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -This study will summarize the knowledge that we currently have on the process of innovation in education. It is therefore in part a synthesis; in this regard, it is noted that it has drawn heavily on the literature that constitutes the vast majority of the literature explicitly dealing with innovation. It approaches all this material from both an educational and an environmental perspective and highlights the need to report on cases of improved living in other parts of the world in a more systematic way. This study goes further, however. In order to provide a guide to this project. The concept of innovation in education is examined in depth. The changes that are introduced in school and higher education can be the key to any technological and economic development; in a given system, the change may consist in adopting some practice already used elsewhere, so that an innovation follows an invention. But what distinguishes an innovation from change in general is the element of planning or deliberate intent.Books on Demand GmbH, Überseering 33, 22297 Hamburg 76 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -The principle of the spinning whatever the origin of the fibers to be treated a disordered mass of fibers to mix them, clean them of their impurities, parallels them in the form of veil, then of ribbon. This sliver will undergo several successive stretching to make them more homogeneous and regular to transform them into wick which represents the intermediate part between the sliver and the wire.Finally, a last stretching will be given to the wick to which we will apply a torsion to obtain the thread. It is essential that in a batch of yarns the physical and chemical properties are substantially the same at all points and to produce a consistent quality, it is necessary that from one batch to another the characteristics are the same For all these reasons it is necessary to mix the fibers thoroughly, mixtures can be realized in two ways:-by operating on the fibers in flock-by operating on the fibers in sliver Cotton plays an important role in the economic development of sub-Saharan Africa. However, only 15% of the cotton grown in the region is processed locally, with the vast majority being exported as raw material.The United Nations Industrial Development Organization (UNIDO) is engaged in various initiatives to support the African cotton sector. At a high-level session on the cotton industry organized by the World Trade Organization in Geneva on March 15 and 16, 2007, UNIDO presented a document entitled 'Support to the Cotton Sector and Prospects for Industrialization'.Books on Demand GmbH, Überseering 33, 22297 Hamburg 60 pp. Englisch.

Taschenbuch. Zustand: 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. Zustand: Neu. Neuware -This paper presents the status of the various renewable energy technologies, the strategy for their development, the progress made and the difficulties encountered. Nine categories of Renewable Energy in the world are discussed: (physical biomass), biofuels and biogas (and renewable waste), - hydroelectricity, - wind power, - solar photovoltaic (PV) power, - solar thermal power, - concentrated solar power (or thermodynamic), - geothermal power, - heat pump power, - 'marine' power. The level of advancement and competitiveness of Renewable Energies is very differentiated according to the technologies, as well as their cost, which also varies greatly according to the resource, local potential and geography. There are technical, financial, political, energy strategy and climate change considerations to take into account. The purpose of this article is only to shed light on the current position and future of Renewable Energies. It is only an element of reflections on energy strategies, whether they are related to energy production or energy demand management (uses, lifestyles and energy savings). These problems have been the subject of many other articles of the Encyclopedia of Sustainable Development recalled in the attached bibliography.Books on Demand GmbH, Überseering 33, 22297 Hamburg 52 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -Freshwater is a resource used in all economic activities (agricultural, industrial, domestic, energy, navigation etc.) that can lead to development. This resource is nowadays threatened by economic activity, population expansion, pollution, and climate change. In order to achieve a sustainable economic and social development, the adoption of integrated water resources management (IWRM) is necessary to manage in a rational and balanced way, and to preserve water resources. This management aims to solve the water problems in the countries and allow the integral and rational use of water in all the sectors of activity. In Algeria, the adoption of IWRM makes it possible to satisfy 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 the water resources in the objective of sustainable development. Water management in Algeria is ensured by the public actors which are the Ministry of Water Resources, the water resources directorates of the wilayas, the river basin agencies and the decentralized administrations under supervision (ADE, SEEAL, ONA, etc.) to control and manage the uses of the resource in order to protect it.Books on Demand GmbH, Überseering 33, 22297 Hamburg 68 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -The international demand for oil and natural gas is increasing day by day. As a result of this work it was found that it is necessary to increase the flow rate of the pipes of their supply with the increase of their operating pressures as well as with the expansion of the pipeline network. Although this is very expensive due to the large projects and geopolitical problems that may be encountered. Therefore, we also see the need to increase the strength of the pipes. On the other hand, the thickness of the pipes, and the properties of mechanical resistance and chemical products transported must be improved taking into account various problems of degradation of these pipes which undergo corrosion attacks that greatly contribute to the reduction of their properties of their service life.Books on Demand GmbH, Überseering 33, 22297 Hamburg 60 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -Today, all the changes in our way of life and our environment with our social and moral relationships have affected our urban way of life in its various structures and relationships. The distribution of work and functions, our land use, modes of transport, industrial and agricultural production, modes of consumption and waste production, certainly, human relations have been affected considerably.The city is indeed the basis of economic and social development and wealth creation, but the social changes have been too rapid to be controlled, because today's society has imposed a way of life where comfort and a whole series of modern conveniences offered by the city are imposed everywhere, creating a standard of living that is becoming generalized and uniform, erasing certain contradictions but revealing glaring disparities. As a result of the modern evolution of the last century, the urban fabric has suffered many damages and transformations and has been hit by many ills and social handicaps. The pace of transformations has not stopped accelerating, and development has become, however, synonymous with destruction and waste of natural resources and balanced human development.Books on Demand GmbH, Überseering 33, 22297 Hamburg 60 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -The High Level Political Forum (HLPF) on Sustainable Development on 'Transformation towards Sustainable and Resilient Societies' provides an opportunity to express its commitment to the implementation and monitoring process of the 2030 Agenda. This forum is an opportunity to submit its approach to the appreciation of its peers and to take advantage of best practices to identify solutions to the challenges and constraints that may hinder its smooth progress towards the satisfactory achievement of the SDGs. Since 2014, the Emerging Plan has been the reference framework for economic and social policy aimed at increasing the well-being and prosperity of people in developing countries. The eradication of poverty in all its forms is at the heart of our policies. The need to eliminate poverty, social exclusion and inequality in our country is a limited priority. This is why Algeria intends to develop effective policies, supported by reliable statistical data, to protect and empower the most vulnerable people namely, youth, women, people with disabilities, people living in poverty and the elderly.Books on Demand GmbH, Überseering 33, 22297 Hamburg 64 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -Steel is an economical, flexible, fully recyclable and widely available construction material. The primary quality of steel, namely its ability to maintain physical and mechanical strength or, in the case of steel structures, its load-bearing capacity, is generally preserved for a long time. It only decreases if corrosion causes cross-sectional reductions that are detrimental to safety.The service life of structures depends on the speed of reactions between the steel and its environment. These reactions depend, moreover, on the nature and the concentration of the corrosive components.In this sense, this work consists in the anticorrosion protection of steel structures and must be taken as an intervention on this process in order to prevent the corrosion reaction and to strongly reduce the speed.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Englisch.

Taschenbuch. Zustand: 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. Zustand: Neu. Neuware -The industrial maintenance takes an increasing importance and appears to be one of the key functions of modern production companies. Our work is devoted to the theoretical and practical study of the reliability of the equipment at the level of the company 'ENTP-Station TP127', in this case, the analysis of the reliability, of the critical elements, based on methods and advanced tools.In this project of end of studies we used the laws of reliability and the methods of analysis, while being based, on tools, like (AMDEC and ABC) very known in reliability, in particular the law of 'Weibull'.In order to concretize our study, we used graphical and analytical methods to determine the critical parameters, which are used for the evaluation of the rate of degradation of the equipments at the level of the station TP127 and, to determine the type of the maintenance to be applied. Finally, we validated our work by a practical study, by choosing the sensitive organs of the strategic equipment of the winch 'at the level of the TP127'. This study allowed us to find results in conformity with the practical reality at the level of the company, which had a positive impact at the level of the station and which will be used and followed by the other stations in exploitation.Books on Demand GmbH, Überseering 33, 22297 Hamburg 72 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -In this thesis we have analyzed a program that improves the functioning of the maintenance management. This type of programming is called FMECA (Failure Modes, Effects and Criticality Analysis) will allow to manage and reduce the downtime with the identification of the most critical elements of a mechanism, we can also learn the mode of the most appropriate maintenance for a determined functioning and for a determined management.We are going to analyze the effectiveness of the FMECA study in the improvement of the maintenance in the means of transport and in particular in the railroad. We have applied this work on the hydraulic braking system of the tramway at the level of the CITAL company, we have used this type of management to approve its effectiveness in the improvement of the maintenance operation at the level of this company.Books on Demand GmbH, Überseering 33, 22297 Hamburg 64 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -The industrial maintenance takes an increasing importance and appears to be one of the key functions of the modern production company. Our work is devoted to the theoretical and practical study of the reliability of equipment at the grinding workshop of the cement plant of Beni Saf in this case the maintenance based on advanced methods of reliability. In our project, we used the laws of reliability and analysis methods (FMECA and ABC) which are known as tools for analysis of equipment degradation. We followed our work by an application of the 'Weibull' law. In order to concretize our study, we have defined the graphical and analytical methods to determine the failure parameters, which are used for the evaluation of the rate of degradation of the equipment and determine the type of maintenance to be applied. Finally, we have validated our thesis by a practical case study, by choosing the sensitive organs of the strategic equipments of the raw meal grinding workshop at the cement plant. This study allowed us to find results in conformity with the practical reality at the level of the company, by using an advanced calculation code.Books on Demand GmbH, Überseering 33, 22297 Hamburg 80 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -Friction losses due to piston rings account for approximately 20% of all mechanical losses in engines. Reduced friction results in higher efficiency, lower fuel consumption and reduced emissions. The goal of this study is to develop a low-friction engine design to improve engine efficiency without compromising oil consumption, wear or cost. These are desirable goals today for engine manufacturers, as they tend to improve engine performance in a time when there is increasing talk of global warming issues. The determination of the instantaneous fluctuation of the parameters of the thermal engine depends on several components representing the environment of the engine, which have complex connections. The determination of the instantaneous friction torque is influenced by the angular determination of the crankshaft during the engine cycle. .Books on Demand GmbH, Überseering 33, 22297 Hamburg 60 pp. Englisch.

Taschenbuch. Zustand: Neu. Neuware -Humans are not only facing a decrease in natural water resources, but also a degradation of water quality, which can make it unfit for consumption. The international community has been aware of this problem for the past thirty years and now wants to apply a dynamic approach to manage our depleted water resources. Research shows that water management must involve all users, especially women and children, as well as planners and decision makers at all levels. The world water vision for the 21st century, which is of concern to the international community, is thus based on the principle of a multidisciplinary approach to water management. It wants to initiate a participatory process of civil society, with particular importance given to women, who everywhere in the different nations are at the center of the tasks and chores related to water. It is education that implies in the first place is the involvement of users. It is essential to promote values and lifestyles that are more adapted to the sustainable stability of an environment. The education of the populations in the matter of water must take into account the diversity of publics: farmers, teachers, students, specialists and all the scientific layer, etc.Books on Demand GmbH, Überseering 33, 22297 Hamburg 56 pp. Englisch.

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