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Etude De Lecoulement De Dean Alterne Pulse
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Book Synopsis Étude de l'écoulement de Dean alterné pulsé by : Brahim Timité
Download or read book Étude de l'écoulement de Dean alterné pulsé written by Brahim Timité and published by . This book was released on 2005 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail a pour objectif, l'étude numérique et expérimentale d'un écoulement tridimensionnel ouvert dépendant du temps qui améliore le mélange par génération de trajectoires spatialement chaotiques : il s'agit de l'écoulement de Dean alterné pulsé en régime laminaire. L'étude numérique est rendue possible par l'intégration d'un sous programme, qui permet l'introduction d'un champ de vitesse pulsé en entrée, dans le code de calcul Fluent. Le dispositif expérimental construit est constitué principalement d'un générateur de pulsations à mécanisme de “Scotch-Yoke'' et d'une série de six coudes alternés de 90°. Le choix du mécanisme de pulsation a été validé par des mesures du champ de vitesse axiale par vélocimétrie laser à effet Doppler. Les vitesses moyennes instantanées obtenues expérimentalement sont des sinusoïdes et sont en accord avec les prédictions analytiques. Des visualisations par fluorescence induite par laser et des mesures de vitesse, couplées aux résultats numériques, ont permis d'analyser l'évolution des structures tourbillonnaires de l'écoulement secondaire qui se développent au sein des coudes durant la pulsation en fonction du nombre de Reynolds stationnaire ( ), du paramètre de fréquence ( ), et du rapport d'amplitude de vitesse. Dans le premier coude, la structure de l'écoulement secondaire est constamment modifiée par l'apparition de l'instabilité de Lyne, et d'un effet siphon pour les grandes valeurs du paramètre ( ) pendant la phase de décélération. Cependant, l'instabilité de Lyne observée dans le premier coude disparaît dans les autres coudes. Ces perpétuelles modifications des structures tourbillonnaires de l'écoulement secondaire sont un facteur de génération de trajectoires " plus " chaotiques. L'étude numérique a permis de mettre en évidence les propriétés chaotiques de l'écoulement par suivi de particules le long de la structure d'étude, et de quantifier le mélange de deux traceurs passifs. L'aspect chaotique de l'écoulement a été mis en évidence expérimentalement par le suivi de la déformation d'une tache de traceur. L'analyse de l'étirement des taches a montré que le caractère pulsé conduit à la production d'un écoulement chaotique engendrant un meilleur mélange.
Book Synopsis Intensification du mélange par advection chaotique pulsée by : Mojtaba Jarrahi Khameneh
Download or read book Intensification du mélange par advection chaotique pulsée written by Mojtaba Jarrahi Khameneh and published by . This book was released on 2010 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le but de cette étude est d'étudier l'amélioration du mélange par superposition d'une dépendance temporelle, sous la forme d'une pulsation, à un écoulement de Dean alterné où les trajectoires des particules fluides sont spatialement chaotiques. La dépendance temporelle de l'écoulement dans les conduites courbes peut générer des écoulements secondaires - composées de deux cellules contra-rotatives (cellules Dean) dans un régime stationnaire - plus complexe. Cette modification de l'écoulement secondaire qui se traduit par des gradients de vitesse plus forts, augmente les étirements et les repliements; et donc le mélange. La configuration chaotique étudiée dans ce travail est composée d’une série de six coudes alternés de 90°. Lors du passage d’un écoulement pulsé (stationnaire+sinusoïdal) dans cette géométrie, les champs de vitesse de l'écoulement secondaire sont mesuré en utilisant la vélocimétrie par images de particules (PIV) pour différentes conditions de pulsation. Pour éviter les effets de réfraction de lumière lors des mesures de PIV, un canal en forme de T est installé en aval du coude d’étude. Les expériences sont réalisées pour une large gamme de nombres de Reynolds stationnaire 420≤Rest≤1000, de rapports d’amplitude de vitesse 1≤(β=Umax,sin/Ust)≤4 et de paramètres de fréquence 8,37≤(α=r0(ω/ν)0,5)≤24,5. Les effets de chaque paramètre (Rest, β et α) sur le mélange transversal sont discutés en comparant les valeurs de vorticité adimensionnelles (|ζP|/|ζS|) et les taux de déformation transversale adimensionnels (|εP|/|εS|) au cours d’une période d’oscillation complète. Les résultats montrent que β≥2 et α≤15 sont les conditions favorables de pulsation pour l'amélioration du mélange. En plus, dans certaines conditions de pulsation, les centres de cellules visitent une zone (dans la section du canal) 9 fois plus grande que celle d’un cas stationnaire.
Book Synopsis ETUDE DE L'ECOULEMENT PULSE D'UN FLUIDE INCOMPRESSIBLE DANS UNE CONDUITE ELASTIQUE by : El Mostafa Benmadda
Download or read book ETUDE DE L'ECOULEMENT PULSE D'UN FLUIDE INCOMPRESSIBLE DANS UNE CONDUITE ELASTIQUE written by El Mostafa Benmadda and published by . This book was released on 1987 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: MODELISATION DE L'ECOULEMENT SANGUIN DANS L'ARBRE ARTERIEL AORTIQUE
Author :U.s. Department of Agriculture Publisher :Createspace Independent Publishing Platform ISBN 13 :9781543136883 Total Pages :46 pages Book Rating :4.1/5 (368 download)
Book Synopsis Farm Profits and Adoption of Precision Agriculture by : U.s. Department of Agriculture
Download or read book Farm Profits and Adoption of Precision Agriculture written by U.s. Department of Agriculture and published by Createspace Independent Publishing Platform. This book was released on 2017-02-15 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precision agriculture (PA) and its suite of information technologies-such as soil and yield mapping using a global positioning system (GPS), GPS tractor guidance systems, and variable-rate input application-allow farm operators to fine-tune their production practices. Access to detailed, within-field information can decrease input costs and increase yields. USDA's Agricultural Resource Management Survey shows that these PA technologies were used on roughly 30 to 50 percent of U.S. corn and soybean acres in 2010-12. Previous studies suggest that use of PA is associated with higher profits under certain conditions, but aggregate estimates of these gains have not been available. In this report, a treatment-effects model is developed to estimate factors associated with PA technology adoption rates and the impacts of adoption on profits. Labor and machinery used in production and certain farm characteristics, like farm size, are associated with adoption as well as with two profit measures, net returns and operating profits. The impact of these PA technologies on profits for U.S. corn producers is positive, but small. Keywords: Crop production information technologies, precision agriculture, variablerate technology, soil tests, global positioning system maps, guidance systems.
Book Synopsis Conservation Agriculture by : Ram A. Jat
Download or read book Conservation Agriculture written by Ram A. Jat and published by CABI. This book was released on 2013-12-13 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book covers the spread of conservation agriculture (CA) to regions including Brazil, Argentina, Canada, Australia, Europe and emerging CA destinations in Asia and Africa. ÿTopics covered include the various components of CA, and how their individual and combined implementation influence productivity, soil health and environmental quality under diverse edaphic and climatic conditions. The book will be useful to teachers, researchers, extensionists, farmers, and students interested in environmental quality.
Book Synopsis Remote Sensing in Precision Agriculture by : Salim Lamine
Download or read book Remote Sensing in Precision Agriculture written by Salim Lamine and published by Elsevier. This book was released on 2023-10-20 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: Remote Sensing in Precision Agriculture: Transforming Scientific Advancement into Innovation compiles the latest applications of remote sensing in agriculture using spaceborne, airborne and drones' geospatial data. The book presents case studies, new algorithms and the latest methods surrounding crop sown area estimation, determining crop health status, assessment of vegetation dynamics, crop diseases identification, crop yield estimation, soil properties, drone image analysis for crop damage assessment, and other issues in precision agriculture. This book is ideal for those seeking to explore and implement remote sensing in an effective and efficient manner with its compendium of scientifically and technologically sound information. - Presents a well-integrated collection of chapters, with quality, consistency and continuity - Provides the latest RS techniques in Precision Agriculture that are addressed by leading experts - Includes detailed, yet geographically global case studies that can be easily understood, reproduced or implemented - Covers geospatial data, with codes available through shared links
Author :John Henry Lorentz Publisher :Historical Dictionaries of Asia, Oceania, and the Middle East ISBN 13 : Total Pages :570 pages Book Rating :4.F/5 ( download)
Book Synopsis Historical Dictionary of Iran by : John Henry Lorentz
Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.
Book Synopsis The Biogeochemistry of Mercury in the Environment by : Jerome O. Nriagu
Download or read book The Biogeochemistry of Mercury in the Environment written by Jerome O. Nriagu and published by Elsevier-North-Holland Biomedical Press. This book was released on 1979 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Methods and Instrumentation for the Investigation of Groundwater Systems by :
Download or read book Methods and Instrumentation for the Investigation of Groundwater Systems written by and published by . This book was released on 1983 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 'Being Alive Well' by : Naomi Adelson
Download or read book 'Being Alive Well' written by Naomi Adelson and published by University of Toronto Press. This book was released on 2000-12-15 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'Being Alive Well': Health and the Politics of Cree Well-Being is a critical medical anthropological analysis of health theory in the social sciences with specific reference to the James Bay Cree of northern Quebec. In it the author argues that definitions of health are not simply reflections of physiological soundness but convey broader cultural and political realities. The book begins with a treatise on the study of health in the social sciences and a call for a broader understanding of the cultural parameters of any definition of health. Following a chapter that outlines the history of the Whapmagoostui (Great Whale River) region and the people, Adelson presents the underlying symbolic foundations of a Cree concept of health, or miyupimaatisiiun. The core of this book is an ethnographic study of the Whapmagoostui Cree and their particular concept of "health" (miyupimaatisiiun or "being alive well"). That concept is mediated by history, cultural practices, and the contemporary world of the Cree, including their fundamental concerns about their land and culture. In the contemporary context, health – or more specifically, "being alive well" – for the Cree of Great Whale is an intimate fusion of social, political, and personal well-being, thus linking individual bodies to a larger socio-political reality.
Book Synopsis Water Flow and Solute Transport in Soils by : David Russo
Download or read book Water Flow and Solute Transport in Soils written by David Russo and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: A year has passed since Eshel Bresler, my good friend and colleague, and a member of the editorial board of the Advanced Series in Agricultural Sciences, died suddenly while on a visit to the Chinese Academy of Sciences in Beijing. We had worked together for almost 30 years at the Institute of Soils and Water, ARO, The Volcani Center at Bet Dagan. At the very beginning of our scientific careers we cooperated directly and as a result one of our first publications was coauthored (Soil Sci. 101:205-209, 1966). Thereafter, our specific research interests diver sified, but we continued to work together, with similar approaches to research, and to strive towards the development of Israel soil science and its integration into general worldwide scientific progress. I don't need to emphasize Eshel's contribution to the understan ding of the processes governing water flow and solute transport pro cesses in soils and unsaturated zones. The contributions to this Volume by such a body of outstanding scientists shows the apprecia tion of the international scientific community to his research achievements.
Book Synopsis Historical Dictionary of Pakistan by : Shahid Javed Burki
Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --
Book Synopsis Aboriginal Health in Canada by : Canada. Health and Welfare Canada
Download or read book Aboriginal Health in Canada written by Canada. Health and Welfare Canada and published by Health and Welfare Canada. This book was released on 1992 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: In September 1990, the Government of Canada has introduced the Native Agenda, which provides for new and strengthened initiatives in a number of key areas. This publication provides an overview of the health care services available to Aboriginal peoples in Canada, focusing particularly on the role of the federal government in providing services. It examines the past and current health status of Indian and Inuit populations, and looks briefly at some of the challenges that lie ahead.
Book Synopsis Soil-Water-Solute Process Characterization by : Javier Alvarez-Benedi
Download or read book Soil-Water-Solute Process Characterization written by Javier Alvarez-Benedi and published by CRC Press. This book was released on 2019-09-23 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: The practitioner or researcher often faces complex alternatives when selecting a method to characterize properties governing a soil process. After years of research and development, environmental and agricultural professionals now have an array of methods for characterizing soil processes. Well-established methods, however, may not be suitable for the specific conditions of a study since many soil characteristics are intrinsically variable. An objective, integrated approach for soil characterization is needed to more effectively quantify parameters. Soil-Water-Solute Process Characterization goes beyond technical guidance and addresses the complicating factors such as spatial and temporal variability of soil processes, scale issues, soil structure, and the trade-offs between methods. It focuses on advanced methods for the monitoring and modeling of mass transfer processes in soil. Expert contributors present limitations to well-known methods and alternatives, discussing their practical applications for characterization efforts, evaluating strengths and weaknesses, and focusing on a reduced set of selected techniques. Three in-depth sections cover everything from multidisciplinary approaches for assessing subsurface non-point source pollution to techniques for characterizing water and energy balances at the soil-plant-atmosphere interface, field methods for monitoring soil water status, and computer models for characterizing the effect of chemicals in soil. This single-source reference is transforming method selection and our understanding of the principles, advantages, and limitations of the available monitoring techniques. Written in a simple and straightforward manner, Soil-Water-Solute Process Characterization is a detailed cookbook and a useful, practical reference for students, practitioners, and researchers.
Book Synopsis Methods and instrumentation for the investigation of groundwater system : internat. symposium, Nordwijkerhout, The Netherlands may, 1983 by :
Download or read book Methods and instrumentation for the investigation of groundwater system : internat. symposium, Nordwijkerhout, The Netherlands may, 1983 written by and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microscopic Simulation of Interfacial Phenomena in Solids and Liquids: Volume 492 by : Simon R. Philllpot
Download or read book Microscopic Simulation of Interfacial Phenomena in Solids and Liquids: Volume 492 written by Simon R. Philllpot and published by . This book was released on 1998-04-24 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Download or read book Ergodic Theory written by Idris Assani and published by Walter de Gruyter GmbH & Co KG. This book was released on 2016-06-20 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph discusses recent advances in ergodic theory and dynamical systems. As a mixture of survey papers of active research areas and original research papers, this volume attracts young and senior researchers alike. Contents: Duality of the almost periodic and proximal relations Limit directions of a vector cocycle, remarks and examples Optimal norm approximation in ergodic theory The iterated Prisoner’s Dilemma: good strategies and their dynamics Lyapunov exponents for conservative twisting dynamics: a survey Takens’ embedding theorem with a continuous observable
