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Author: Elise El Ahmar
Publisher:
ISBN:
Category :
Languages : fr
Pages : 154
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Book Description
La lutte contre la pollution produite par les véhicules automobiles a induit de nombreuses recherches orientées vers l’amélioration des techniques de combustion. Une nouvelle technologie basée sur le traitement plasma des gaz à l'admission semble pouvoir améliorer le fonctionnement des moteurs thermiques et diminuer la pollution. La technique consiste à enrichir en hydrogène (H2) le mélange air-méthane (CH4) avant son admission dans le moteur. L’objectif de ce travail a été la conception et la réalisation de deux réacteurs plasmas à décharges glissantes fonctionnant à la pression atmosphérique destinés à la production de gaz de synthèse (CO+H2). Une étude paramétrique (débit, puissance électrique et concentration initiale de CH4) a été menée sur les deux réacteurs afin de montrer leurs efficacités pour la conversion de CH4 et la production de H2. Une concentration maximale de H2 de 20% a été obtenue à la sortie du réacteur plasma. Les résultats expérimentaux ont été comparés à un modèle thermodynamique qui a permis de montrer que seulement 35 à 45% du gaz injecté est effectivement traité par la décharge. Des études cinétiques et physico-chimiques (couplage d’un modèle d’écoulement à un modèle cinétique) ont été menées pour une meilleure compréhension des phénomènes mis en jeu dans le plasma. Les essais sur le banc moteur ont montré une réduction des émissions des oxydes d’azote et des hydrocarbures imbrulés et une augmentation des émissions du monoxyde de carbone.
Author: Elise El Ahmar
Publisher:
ISBN:
Category :
Languages : fr
Pages : 154
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Book Description
La lutte contre la pollution produite par les véhicules automobiles a induit de nombreuses recherches orientées vers l’amélioration des techniques de combustion. Une nouvelle technologie basée sur le traitement plasma des gaz à l'admission semble pouvoir améliorer le fonctionnement des moteurs thermiques et diminuer la pollution. La technique consiste à enrichir en hydrogène (H2) le mélange air-méthane (CH4) avant son admission dans le moteur. L’objectif de ce travail a été la conception et la réalisation de deux réacteurs plasmas à décharges glissantes fonctionnant à la pression atmosphérique destinés à la production de gaz de synthèse (CO+H2). Une étude paramétrique (débit, puissance électrique et concentration initiale de CH4) a été menée sur les deux réacteurs afin de montrer leurs efficacités pour la conversion de CH4 et la production de H2. Une concentration maximale de H2 de 20% a été obtenue à la sortie du réacteur plasma. Les résultats expérimentaux ont été comparés à un modèle thermodynamique qui a permis de montrer que seulement 35 à 45% du gaz injecté est effectivement traité par la décharge. Des études cinétiques et physico-chimiques (couplage d’un modèle d’écoulement à un modèle cinétique) ont été menées pour une meilleure compréhension des phénomènes mis en jeu dans le plasma. Les essais sur le banc moteur ont montré une réduction des émissions des oxydes d’azote et des hydrocarbures imbrulés et une augmentation des émissions du monoxyde de carbone.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: International Atomic Energy Agency
Publisher: International Atomic Energy Agency
ISBN: 9789201063205
Category : Technology & Engineering
Languages : en
Pages : 72
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Book Description
This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Author: Biodiesel Production Technologies Challenges and Future Prospects Task Committee
Publisher:
ISBN: 9780784415344
Category : Biodiesel fuels
Languages : en
Pages : 848
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Book Description
Biodiesel Production: Technologies, Challenges, and Future Prospects provides in-depth information on fundamentals, approaches, technologies, source materials and associated socio-economic and political impacts of biodiesel production.
Author: International Livestock Research Institute
Publisher: ILRI (aka ILCA and ILRAD)
ISBN: 9789291460038
Category : Animal industry
Languages : en
Pages : 268
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Book Description
Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.
Author: Michael Panik
Publisher: CRC Press
ISBN: 1420091980
Category : Mathematics
Languages : en
Pages : 832
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Book Description
Regression Modeling: Methods, Theory, and Computation with SAS provides an introduction to a diverse assortment of regression techniques using SAS to solve a wide variety of regression problems. The author fully documents the SAS programs and thoroughly explains the output produced by the programs.The text presents the popular ordinary least square
Author: Canada. Patent Office
Publisher:
ISBN:
Category : Copyright
Languages : en
Pages : 1070
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Book Description
Author: Georgeta Raţă
Publisher: Cambridge Scholars Publishing
ISBN: 1443839612
Category : Foreign Language Study
Languages : en
Pages : 385
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Book Description
Agricultural English is a collection of essays on the English of Agriculture. The approach is a linguistic one: the different aspects of the English used in the field of agriculture (agricultural practices, agricultural systems) and in some fields related to agriculture (agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, zoology) are analysed from a morphological (combination, derivation), syntactical (nominal phrases, verbal phrases), lexical and lexicographical, semantic (homonymy, semantic fields, synonymy, terminology), pragmatic (academic discourse, idiom, metaphor), etymological (etymon, Latin heritage), and contrastive (English–Croatian, English–French, English–German, English–Romanian, Romanian–English) points of view. The book will appeal to agriculturists, animal breeders, professors, researchers, students, and translators from Croatian-, English-, French-, German-, and Romanian-speaking countries, active in their own countries or abroad. The types of academic readership it would appeal to include academic teaching staff, researchers and students in the fields of agriculture and related fields – agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, and zoology.
Author: World Bank
Publisher: World Bank Publications
ISBN: 0821385631
Category : Social Science
Languages : en
Pages : 114
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Book Description
This report provides the most comprehensive and rigorous analysis of Iraqi income and expenditure in several decades. The report makes extensive use of the Iraq Household Socio-Economic Survey, the first nationwide income and expenditure survey since 1988. IHSES data is complemented income and expenditure data from a wide range of other measures of living standards, allowing us to analyze living standards in a holistic way. The analysis presented here was performed with two main goals first, to inform the Government s Poverty Reduction Strategy; and second, to serve as a baseline for future assessments of changes in living standards and the identification of critical issues for deeper examination. Iraqi living standards have two unusual characteristics. First, they have fallen over the past generation. Second, they feature surprisingly little inequality. These characteristics are both rooted in Iraq s recent history of authoritarian government, war, military occupation, insurgency, and civil strife leading to infrastructure destruction and population displacement. There have been few opportunities for individuals to prosper from professional or entrepreneurial activities. Decades of neglected investment have resulted in deterioration of social services and economic infrastructure. Consequently, individuals have lacked capabilities to prosper and an investment climate conducive to prosperity. School enrollment and life expectancy have declined. Extremely low returns to education reflect the combination of poor educational quality and lack of employment opportunities. In terms of economic infrastructure, access to reliable electricity and water, and even access to paved roads are low, are further reflections of decades of neglect. While the upper end of the distribution has been pulled down by a lack of opportunities, the lower end has been supported by direct government provision of food. The Public Distribution System (PDS) provides 85 percent of food needs. While PDS has been useful as a safety net for the poor and the vulnerable, the system is expensive, inefficient, and fiscally risky. Indeed, PDS food rations account for a far greater share of public spending than does education or health. Going forward, Iraq faces two main challenges. First, although Iraq does not have to develop from scratch, it faces a formidable challenge in re-development. Second, a shift by the Government is required from direct provision of basic subsistence toward investment in human capacities. The Government can provide an enabling environment through investments in economic infrastructure and services to business and citizens, thus allowing the population to make productive use of education and their own labor. Both challenges are now being taken up by the Poverty Reduction Strategy, which articulates a detailed set of required actions and outlines priorities for government spending.
Author: Christine Parent
Publisher: Springer Science & Business Media
ISBN: 354030326X
Category : Computers
Languages : en
Pages : 475
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Book Description
From environmental management to land planning and geo-marketing, the number of application domains that may greatly benefit from using data enriched with spatio-temporal features is expanding very rapidly. This book shows that a conceptual design approach for spatio-temporal databases is both feasible and easy to apprehend. While providing a firm basis through extensive discussion of traditional data modeling concepts, the major focus of the book is on modeling spatial and temporal information.
