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Author: Hossine Amokrane
Publisher:
ISBN:
Category :
Languages : fr
Pages : 286
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Book Description
DANS LE CADRE DE RECHERCHES MENEES SUR LE PHENOMENE DE PLUIES ACIDES, NOUS PRESENTONS UNE ETUDE EXPERIMENTALE SUR L'ABSORPTION DE GAZ PAR DES GOUTTES D'EAU EN VUE DE VALIDER LES MODELES MIS AU POINT. LES ETUDES DE MODELISATION DU TRANSFERT DE MASSE ENTRE LE DIOXYDE DE SOUFRE ET UNE GOUTTE D'EAU ONT PORTE SUR DEUX SITUATIONS: I) LA GOUTTE EST DE FAIBLE DIAMETRE, DANS CE CAS ELLE EST DE FORME SPHERIQUE ET LA MODELISATION S'APPUIE SUR LA RESOLUTION NUMERIQUE DE L'EQUATION DE DIFFUSION-CONVECTION A L'INTERIEUR ET A L'EXTERIEUR DE LA GOUTTE; II) LA GOUTTE EST DE FORT DIAMETRE, DANS CE CAS, DES PHENOMENES TELS QUE LES OSCILLATIONS DE FORME ET L'AGITATION INTERFACIALE VONT DOMINER ET AFFECTER DE FACON TOTALEMENT DIFFERENTE LES TRANSFERTS INTERFACIAUX. DANS CE CAS, ON UTILISE UNE APPROCHE DE TYPE PARAMETREE; ELLE S'APPUIE SUR LA MISE EN EVIDENCE D'ECHELLES LOCALES DE VITESSE ET DE LONGUEUR CARACTERISTIQUES. LA PARTIE EXPERIMENTALE CONSTITUE LA PART IMPORTANTE DE NOTRE CONTRIBUTION. ELLE PORTE SUR LA CONCEPTION ET LA REALISATION D'UNE INSTALLATION EXPERIMENTALE DE LABORATOIRE DITE COLONNE A PRECIPITATIONS DESTINEE A LA SIMULATION DU TRANSFERT DE MASSE. LES RESULTATS EXPERIMENTAUX CONFIRMENT LA VALIDITE DES MODELES MIS AU POINT. DANS LE CAS DES PETITES GOUTTES, LE TRANSFERT DE MASSE A L'INTERIEUR DE LA GOUTTE EST REGI PAR LA CONVECTION ET LA DIFFUSION MOLECULAIRE. DANS LE CAS DES GROSSES GOUTTES, LES RESULTATS EXPERIMENTAUX CONFIRMENT TOUT L'INTERET D'UN MODELE DE TYPE FORTESCUE & PEARSON S'APPUYANT SUR LA VITESSE DE FROTTEMENT INTERFACIAL COMME ECHELLE DE VITESSE
Author: Hossine Amokrane
Publisher:
ISBN:
Category :
Languages : fr
Pages : 286
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Book Description
DANS LE CADRE DE RECHERCHES MENEES SUR LE PHENOMENE DE PLUIES ACIDES, NOUS PRESENTONS UNE ETUDE EXPERIMENTALE SUR L'ABSORPTION DE GAZ PAR DES GOUTTES D'EAU EN VUE DE VALIDER LES MODELES MIS AU POINT. LES ETUDES DE MODELISATION DU TRANSFERT DE MASSE ENTRE LE DIOXYDE DE SOUFRE ET UNE GOUTTE D'EAU ONT PORTE SUR DEUX SITUATIONS: I) LA GOUTTE EST DE FAIBLE DIAMETRE, DANS CE CAS ELLE EST DE FORME SPHERIQUE ET LA MODELISATION S'APPUIE SUR LA RESOLUTION NUMERIQUE DE L'EQUATION DE DIFFUSION-CONVECTION A L'INTERIEUR ET A L'EXTERIEUR DE LA GOUTTE; II) LA GOUTTE EST DE FORT DIAMETRE, DANS CE CAS, DES PHENOMENES TELS QUE LES OSCILLATIONS DE FORME ET L'AGITATION INTERFACIALE VONT DOMINER ET AFFECTER DE FACON TOTALEMENT DIFFERENTE LES TRANSFERTS INTERFACIAUX. DANS CE CAS, ON UTILISE UNE APPROCHE DE TYPE PARAMETREE; ELLE S'APPUIE SUR LA MISE EN EVIDENCE D'ECHELLES LOCALES DE VITESSE ET DE LONGUEUR CARACTERISTIQUES. LA PARTIE EXPERIMENTALE CONSTITUE LA PART IMPORTANTE DE NOTRE CONTRIBUTION. ELLE PORTE SUR LA CONCEPTION ET LA REALISATION D'UNE INSTALLATION EXPERIMENTALE DE LABORATOIRE DITE COLONNE A PRECIPITATIONS DESTINEE A LA SIMULATION DU TRANSFERT DE MASSE. LES RESULTATS EXPERIMENTAUX CONFIRMENT LA VALIDITE DES MODELES MIS AU POINT. DANS LE CAS DES PETITES GOUTTES, LE TRANSFERT DE MASSE A L'INTERIEUR DE LA GOUTTE EST REGI PAR LA CONVECTION ET LA DIFFUSION MOLECULAIRE. DANS LE CAS DES GROSSES GOUTTES, LES RESULTATS EXPERIMENTAUX CONFIRMENT TOUT L'INTERET D'UN MODELE DE TYPE FORTESCUE & PEARSON S'APPUYANT SUR LA VITESSE DE FROTTEMENT INTERFACIAL COMME ECHELLE DE VITESSE
Author: Bernd Jähne
Publisher:
ISBN:
Category : Bubbles
Languages : en
Pages : 940
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Book Description
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: Linda Strande
Publisher: IWA Publishing
ISBN: 1780404735
Category : Technology & Engineering
Languages : en
Pages : 428
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Book Description
It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309170435
Category : Nature
Languages : en
Pages : 241
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Book Description
Having safe drinking water is important to all Americans. The Environmental Protection Agency's decision in the summer of 2001 to delay implementing a new, more stringent standard for the maximum allowable level for arsenic in drinking water generated a great deal of criticism and controversy. Ultimately at issue were newer data on arsenic beyond those that had been examined in a 1999 National Research Council report. EPA asked the National Research Council for an evaluation of the new data available. The committee's analyses and conclusions are presented in Arsenic in Drinking Water: 2001 Update. New epidemiological studies are critically evaluated, as are new experimental data that provide information on how and at what level arsenic in drinking water can lead to cancer. The report's findings are consistent with those of the 1999 report that found high risks of cancer at the previous federal standard of 50 parts per billion. In fact, the new report concludes that men and women who consume water containing 3 parts per billion of arsenic daily have about a 1 in 1,000 increased risk of developing bladder or lung cancer during their lifetime.
Author: Jacques Lafontaine
Publisher: Springer
ISBN: 3319207350
Category : Mathematics
Languages : en
Pages : 408
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Book Description
This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Author: P. M. Banks
Publisher: Elsevier
ISBN: 1483260666
Category : Science
Languages : en
Pages : 445
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Book Description
Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.
Author: W. Petruk
Publisher: Elsevier
ISBN: 0080527337
Category : Technology & Engineering
Languages : en
Pages : 287
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Book Description
Techniques of performing applied mineralogy investigations, and applications and capabilities of recently developed instruments for measuring mineral properties are explored in this book intended for practicing applied mineralogists, students in mineralogy and metallurgy, and mineral processing engineers. The benefits of applied mineralogy are presented by using in-depth applied mineralogy studies on base metal ores, gold ores, porphyry copper ores, iron ores and industrial minerals as examples. The chapter on base metal ores includes a discussion on the effects of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- on the recoveries of sphalerite, galena and chalcopyrite. The chapter on gold discusses various methods of determining the quantities of gold in different minerals, including 'invisible' gold in pyrite and arsenopyrite, so that a balance of the distribution of gold among the minerals can be calculated. This book also discusses the roles of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes currently used and proposed methods of remediation of acidic drainage.
Author: Vincent C. H. Tong
Publisher: Cambridge University Press
ISBN: 1107041724
Category : Science
Languages : en
Pages : 467
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Book Description
Taking a transdisciplinary approach to seismology, this unique book reviews the most recent developments in planetary seismology, helioseismology, and asteroseismology.
Author: Sue Blattes
Publisher: L'Editeur : EDP Sciences
ISBN: 9782868835888
Category : English language
Languages : fr
Pages : 264
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Book Description
Cet ouvrage, devenu célèbre sous son sigle MCSE, a déjà été utilisé par plus de 50 000 étudiants, chercheurs, professionnels. L'objectif est de lire et écrire des textes en anglais scientifique avec facilité et pertinence. L'ouvrage est conçu pour que l'apprenant devienne un véritable utilisateur de l'anglais. La méthode originale repose sur l'analyse des fonctions et structures nécessaires : measurement, frequency, comparison, modification, link words, time, cause and consequence, hypothesis, modality, purpose and process, impersonal forms, compound nouns and adjectives. Dans chaque unit, des tests d'auto-évaluation permettent de se situer et de construire son parcours de formation, d'abord en définissant ses objectifs à l'aide des key points et du lexis, puis, de façon plus personnalisée, en puisant dans les examples in context, checkpoints (back to basics, word web), web search, FAQs... MCSE est l'outil de base d'une méthode qui comprend aussi d'autres outils dans la même collection (Listening Comprehension for Scientiflc English et Speaking Skills in Scientitic English). L'ouvrage est destiné à tout apprenant de niveau baccalauréat qui désire acquérir une réelle compétence dans l'écriture et la lecture de textes en anglais scientifique.
