Contribution à la conception de convertisseur à découpage de faible puissance à résonance

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ISBN 13 :
Total Pages : 262 pages
Book Rating : 4.:/5 (496 download)

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Book Synopsis Contribution à la conception de convertisseur à découpage de faible puissance à résonance by : Aka Tanoh

Download or read book Contribution à la conception de convertisseur à découpage de faible puissance à résonance written by Aka Tanoh and published by . This book was released on 1994 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: AFIN D'AMELIORER LES PERFORMANCES ET LA COMPACITE DES CONVERTISSEURS A DECOUPAGE, UNE TENDANCE A TOUJOURS PREVALUE: AUGMENTER LA FREQUENCE DE FONCTIONNEMENT. POUR Y PARVENIR ON A DE PLUS EN PLUS RECOURS AU CONCEPT DE LA COMMUTATION DOUCE. CES TECHNIQUES ONT JUSQUE LA ETE APPLIQUEES A LA MOYENNE ET FORTE PUISSANCE. CE TRAVAIL PRESENTE, D'UNE PART, UNE APPLICATION DES PRINCIPES DE LA QUASI-RESONNANCE A LA CONCEPTION ET A LA REALISATION D'UN CONVERTISSEUR CONTINU-CONTINU DE FAIBLE PUISSANCE (100W/500KHZ). D'AUTRE PART, L'ETUDE DE LA FIABILITE A TRAVERS UN EXAMEN DES PROBABILITES DE PANNE DES DIFFERENTS COMPOSANTS DE PUISSANCE, NOUS A PERMIS DE METTRE EN EVIDENCE LA NECESSITE DE SURVEILLER LE CONDENSATEUR ELECTROLYTIQUE DE FILTRAGE ET LE TRANSISTOR MOSFET EN VUE D'UNE MAINTENANCE PREDICTIVE. ENFIN NOUS EXAMINONS UNE APPROCHE DE DETECTION DE DEFAUT DUS AUX ELEMENTS DU CIRCUIT RESONANT DU CONVERTISSEUR. CECI NOUS A PERMIS DE MONTRER QUE LE COURANT CRETE CONSTITUE UN VERITABLE INDICATEUR DE DEFAILLANCE DE CES ELEMENTS. CETTE APPROCHE A ETE CONFIRMEE PAR DES RESULTATS DE SIMULATION

Reconfigurable Gate Driver Toward High-Power Efficiency and High-Power Density Converters

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

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Book Synopsis Reconfigurable Gate Driver Toward High-Power Efficiency and High-Power Density Converters by : Mousa Karimi

Download or read book Reconfigurable Gate Driver Toward High-Power Efficiency and High-Power Density Converters written by Mousa Karimi and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les systèmes de gestion de l'énergie exigent des convertisseurs de puissance pour fournir une conversion de puissance adaptée à diverses utilisations. Il existe différents types de convertisseurs de puissance, tel que les amplificateurs de puissance de classe D, les demi-ponts, les ponts complets, les amplificateurs de puissance de classe E, les convertisseurs buck et dernièrement les convertisseurs boost. Prenons par exemple les dispositifs implantables, lorsque l'énergie est prélevée de la source principale, des convertisseurs de puissance buck ou boost sont nécessaires pour traiter l'énergie de l'entrée et fournir une énergie propre et adaptée aux différentes parties du système. D'autre part, dans les stations de charge des voitures électriques, les nouveaux téléphones portables, les stimulateurs neuronaux, etc., l'énergie sans fil a été utilisée pour assurer une alimentation à distance, et des amplificateurs de puissance de classe E sont développés pour accomplir cette tâche. Les amplificateurs de puissance de classe D sont un excellent choix pour les casques d'écoute ou les haut-parleurs en raison de leur grande efficacité. Dans le cas des interfaces de capteurs, les demi-ponts et les ponts complets sont les interfaces appropriées entre les systèmes à faible et à forte puissance. Dans les applications automobiles, l'interface du capteur reçoit le signal du côté puissance réduite et le transmet à un réseau du côté puissance élevée. En outre, l'interface du capteur doit recevoir un signal du côté haute puissance et le convertir vers la côté basse puissance. Tous les systèmes mentionnés ci-dessus nécessitent l'inclusion d'un pilote de porte spécifique dans les circuits, selon les applications. Les commandes de porte comprennent généralement un décalage du niveau de commande niveau supérieur, le levier de changement de niveau inférieur, une chaîne de tampon, un circuit de verrouillage sous tension, un circuit de temps mort, des portes logiques, un inverseur de Schmitt et un mécanisme de démarrage. Ces circuits sont nécessaires pour assurer le bon fonctionnement des systèmes de conversion de puissance. Un circuit d'attaque de porte reconfigurable prendrait en charge une vaste gamme de convertisseurs de puissance ayant une tension d'entrée V[indice IN] et un courant de sortie I[indice Load] variables. L'objectif de ce projet est d'étudier intensivement les causes de différentes pertes dans les convertisseurs de puissance et de proposer ensuite de nouveaux circuits et méthodologies dans les différents circuits des conducteurs de porte pour atteindre une conversion de puissance avec une haute efficacité et densité de puissance. Nous proposons dans cette thèse de nouveaux circuits de gestion des temps mort, un Shapeshifter de niveau plus élevé et un Shapeshifter de niveau inférieur avec de nouvelles topologies qui ont été pleinement caractérisées expérimentalement. De plus, l'équation mathématique du temps mort optimal pour les faces haute et basse d'un convertisseur buck est dérivée et expérimentalement prouvée. Les circuits intégrés personnalisés et les méthodologies proposées sont validés avec différents convertisseurs de puissance, tels que les convertisseurs semi-pont et en boucle ouverte, en utilisant des composants standard pour démontrer leur supériorité sur les solutions traditionnelles. Les principales contributions de cette recherche ont été présentées à sept conférences prestigieuses, trois articles évalués par des pairs, qui ont été publiés ou présentés, et une divulgation d'invention. Une contribution importante de ce travail recherche est la proposition d'un nouveau générateur actif CMOS intégré dédié de signaux sans chevauchement. Ce générateur a été fabriqué à l'aide de la technologie AMS de 0.35μm et consomme 16.8mW à partir d'une tension d'alimentation de 3.3V pour commander de manière appropriée les côtés bas et haut d'un demi-pont afin d'éliminer la propagation. La puce fabriquée est validée de façon expérimentale avec un demi-pont, qui a été mis en œuvre avec des composants disponibles sur le marché et qui contrôle une charge R-L. Les résultats des mesures montrent une réduction de 40% de la perte totale d'un demi-pont de 45V d'entrée à 1MHz par rapport au fonctionnement du demi-pont sans notre circuit intégré dédié. Le circuit principal du circuit d'attaque de grille côté haut est le décaleur de niveau, qui fournit un signal de grande amplitude pour le commutateur de puissance côté haut. Une nouvelle structure de décalage de niveau avec un délai de propagation minimal doit être présentée. Nous proposons une nouvelle topologie de décalage de niveau pour le côté haut des drivers de porte afin de produire des convertisseurs de puissance efficaces. Le SL présente des délais de propagation mesurés de 7.6ns. Les résultats mesurés montrent le fonctionnement du circuit présenté sur la plage de fréquence de 1MHz à 130MHz. Le circuit fabriqué consomme 31.5pW de puissance statique et 3.4pJ d'énergie par transition à 1kHz, V[indice DDL] = 0.8V , V[indice DDH] = 3.0V, et une charge capacitive C[indice L] = 0.1pF. La consommation énergétique totale mesurée par rapport à la charge capacitive de 0.1 à 100nF est indiquée. Un autre nouveau décalage vers le bas est proposé pour être utilisé sur le côté bas des pilotes de portes. Ce circuit est également nécessaire dans la partie Rx du réseau de bus de données pour recevoir le signal haute tension du réseau et délivrer un signal de faible amplitude à la partie basse tension. L'une des principales contributions de ces travaux est la proposition d'un modèle de référence pour l'abaissement de niveau à puissance unique reconfigurable. Le circuit proposé pilote avec succès une gamme de charges capacitives allant de 10fF à 350pF. Le circuit présenté consomme des puissances statiques et dynamiques de 62.37pW et 108.9μW, respectivement, à partir d'une alimentation de 3.3V lorsqu'il fonctionne à 1MHz et pilote une charge capacitive de 10pF. Les résultats de la simulation post-layout montrent que les délais de propagation de chute et de montée dans les trois configurations sont respectivement de l'ordre de 0.54 à 26.5ns et de 11.2 à 117.2ns. La puce occupe une surface de 80μm × 100μm. En effet, les temps morts des côtés hauts et bas varient en raison de la différence de fonctionnement des commutateurs de puissance côté haut et côté bas, qui sont respectivement en commutation dure et douce. Par conséquent, un générateur de temps mort reconfigurable asymétrique doit être ajouté aux pilotes de portes traditionnelles pour obtenir une conversion efficace. Notamment, le temps mort asymétrique optimal pour les côtés hauts et bas des convertisseurs de puissance à base de Gan doit être fourni par un circuit de commande de grille reconfigurable pour obtenir une conception efficace. Le temps mort optimal pour les convertisseurs de puissance dépend de la topologie. Une autre contribution importante de ce travail est la dérivation d'une équation précise du temps mort optimal pour un convertisseur buck. Le générateur de temps mort asymétrique reconfigurable fabriqué sur mesure est connecté à un convertisseur buck pour valider le fonctionnement du circuit proposé et l'équation dérivée. De plus le rendement d'un convertisseur buck typique avec T[indice DLH] minimum et T[indice DHL] optimal (basé sur l'équation dérivée) à I[indice Load] = 25mA est amélioré de 12% par rapport à un convertisseur avec un temps mort fixe de T[indice DLH] = T[indice DHL] = 12ns.

Soft Commutation

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Publisher : Springer Science & Business Media
ISBN 13 : 9780412395109
Total Pages : 258 pages
Book Rating : 4.3/5 (951 download)

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Book Synopsis Soft Commutation by : Y. Cheron

Download or read book Soft Commutation written by Y. Cheron and published by Springer Science & Business Media. This book was released on 1992-05-31 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author gives a thorough explanation of soft commutation making use of the concept of duality to explain the principles of the technique and to place it in context in the field of power electronics.

Knowing our lands and resources

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Publisher : UNESCO Publishing
ISBN 13 : 9231002104
Total Pages : 150 pages
Book Rating : 4.2/5 (31 download)

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Book Synopsis Knowing our lands and resources by : Roué, Marie

Download or read book Knowing our lands and resources written by Roué, Marie and published by UNESCO Publishing. This book was released on 2017-04-03 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Violence of Modernity

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Publisher : JHU Press
ISBN 13 : 1421429292
Total Pages : 289 pages
Book Rating : 4.4/5 (214 download)

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Book Synopsis The Violence of Modernity by : Debarati Sanyal

Download or read book The Violence of Modernity written by Debarati Sanyal and published by JHU Press. This book was released on 2020-03-03 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Violence of Modernity turns to Charles Baudelaire, one of the most canonical figures of literary modernism, in order to reclaim an aesthetic legacy for ethical inquiry and historical critique. Works of modern literature are commonly theorized as symptomatic responses to the trauma of history. In a climate that tends to privilege crisis over critique, Debarati Sanyal argues that it is urgent to rethink literary experience in terms that recall its contestatory potential. Examining Baudelaire's poems afresh, she shifts the focus of critical attention toward an account of modernism as an active engagement with violence, specifically the violence of history in nineteenth-century France. Sanyal analyzes a literary current that uses the traditional hallmarks of modernism—irony, intertextuality, self-reflexivity, and formalism—to challenge the historical violence of modernity. Baudelaire and the committed ironists writing in his wake teach us how to read and resist the violence of history, and thereby to challenge the melancholy tenor of our contemporary "wound culture." In a series of provocative readings, Sanyal presents Baudelaire's poetry as an aesthetic form that contests historical violence through rhetorical strategies of complicity, counterviolence, and critique. The book develops a new account of Baudelaire's significance as a modernist by dislodging him both from his traditional status as a practitioner of "art for art's sake" and from his more recent incarnation as the poet of trauma. Following her extended analysis of Baudelaire's poetry, Sanyal in later chapters considers a number of authors influenced by his strategies—including Rachilde, Virginie Despentes, Albert Camus, and Jean-Paul Sartre—to examine the relevance of their interventions for our current climate of trauma and terror. The result is a study that underscores how Baudelaire's legacy continues to energize literary engagements with the violence of modernity.

Dictionary of Building and Civil Engineering

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Publisher : Taylor & Francis
ISBN 13 : 9780419199106
Total Pages : 472 pages
Book Rating : 4.1/5 (991 download)

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Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

An Introduction To Plasmonics

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Publisher : World Scientific
ISBN 13 : 1800613415
Total Pages : 356 pages
Book Rating : 4.8/5 (6 download)

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Book Synopsis An Introduction To Plasmonics by : Olivier Pluchery

Download or read book An Introduction To Plasmonics written by Olivier Pluchery and published by World Scientific. This book was released on 2023-08-28 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is a plasmon? Is it a particle, like a photon or a wave? Plasmonics stands at the frontier of condensed matter physics, which is the world of electrons, optics and of photons. Plasmonics is one of the most active fields in nanophotonics. This book begins by exploring the concepts behind waves, and the electromagnetic description of light when it interacts with metals; it dedicates every chapter thereafter to all aspects of plasmonics. In particular, the surface plasmon polariton wave is explained in full detail, as well as the localized surface plasmon resonance of metallic nanoparticles. The active research area opened by plasmonics, as well as its applications, are also briefly explained, such as advanced biosensing, subwavelength waveguiding, quantum plasmonics, nanoparticle-based cancer therapies, optical nano-antenna and high-efficiency photovoltaic cells.The book is adapted for graduate students and places a special emphasis on providing complete explanations of the fundamental concepts of plasmonics. Further, each of these concepts is illustrated with examples drawn from the most recent scientific literature. Each chapter ends with a set of exercises that will help the reader revise the concepts and go deeper into the world of plasmonics. More than 70 exercises are included.

Acoustics of Porous Media

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Publisher : Editions TECHNIP
ISBN 13 : 9782710805168
Total Pages : 366 pages
Book Rating : 4.8/5 (51 download)

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Book Synopsis Acoustics of Porous Media by : Thierry Bourbié

Download or read book Acoustics of Porous Media written by Thierry Bourbié and published by Editions TECHNIP. This book was released on 1987 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

DC—DC Converters for Future Renewable Energy Systems

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Publisher : Springer Nature
ISBN 13 : 9811643881
Total Pages : 480 pages
Book Rating : 4.8/5 (116 download)

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Book Synopsis DC—DC Converters for Future Renewable Energy Systems by : Neeraj Priyadarshi

Download or read book DC—DC Converters for Future Renewable Energy Systems written by Neeraj Priyadarshi and published by Springer Nature. This book was released on 2021-09-27 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the analysis and control of numerous DC-DC converters widely used in several applications such as standalone, grid integration, and motor drives-based renewable energy systems. The book provides extensive simulation and practical analysis of recent and advanced DC-DC power converter topologies. This self-contained book contributes to DC-DC converters design, control techniques, and industrial as well as domestic applications of renewable energy systems. This volume will be useful for undergraduate/postgraduate students, energy planners, designers, system analysis, and system governors.

Africa from the Sixteenth to the Eighteenth Century

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Publisher : Univ of California Press
ISBN 13 : 9780435948115
Total Pages : 1088 pages
Book Rating : 4.9/5 (481 download)

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Book Synopsis Africa from the Sixteenth to the Eighteenth Century by : Bethwell A. Ogot

Download or read book Africa from the Sixteenth to the Eighteenth Century written by Bethwell A. Ogot and published by Univ of California Press. This book was released on 1992 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt: The result of years of work by scholars from all over the world, The UNESCO General History of Africa reflects how the different peoples of Africa view their civilizations and shows the historical relationships between the various parts of the continent. Historical connections with other continents demonstrate Africa's contribution to the development of human civilization. Each volume is lavishly illustrated and contains a comprehensive bibliography. This fifth volume of the acclaimed series covers the history of the continent from the beginning of the sixteenth century to the close of the eighteenth century in which two themes emerge: first, the continuing internal evolution of the states and cultures of Africa during this period second, the increasing involvement of Africa in external trade--with major but unforeseen consequences for the whole world. In North Africa, we see the Ottomans conquer Egypt. South of the Sahara, some of the larger, older states collapse, and new power bases emerge. Traditional religions continue to coexist with both Christianity (suffering setbacks) and Islam (in the ascendancy). Along the coast, particularly of West Africa, Europeans establish a trading network which, with the development of New World plantation agriculture, becomes the focus of the international slave trade. The immediate consequences of this trade for Africa are explored, and it is argued that the long-term global consequences include the foundation of the present world-economy with all its built-in inequalities.

The First Garden

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Publisher : House of Anansi
ISBN 13 : 9780887845970
Total Pages : 164 pages
Book Rating : 4.8/5 (459 download)

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Book Synopsis The First Garden by : Anne Hebert

Download or read book The First Garden written by Anne Hebert and published by House of Anansi. This book was released on 1990-01-01 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: "When her long-estranged daughter disappears in Quebec, famous actress Flora Fontanges returns home from Paris and experiences a devastating confrontation with the past."

Livestock Policy Analysis

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Publisher : ILRI (aka ILCA and ILRAD)
ISBN 13 : 9789291460038
Total Pages : 268 pages
Book Rating : 4.4/5 (6 download)

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Book Synopsis Livestock Policy Analysis by : International Livestock Research Institute

Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Amongst Mathematicians

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Publisher : Springer Science & Business Media
ISBN 13 : 0387371419
Total Pages : 349 pages
Book Rating : 4.3/5 (873 download)

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Book Synopsis Amongst Mathematicians by : Elena Nardi

Download or read book Amongst Mathematicians written by Elena Nardi and published by Springer Science & Business Media. This book was released on 2008 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a unique perspective on ways in which mathematicians: perceive their students' learning; teach; reflect on their teaching practice. Elena Nardi achieves this by employing two fictional, yet entirely data-grounded, characters to create a conversation on these important issues. The construction of these characters is based on large bodies of data including intense focused group interviews with mathematicians and extensive analyses of students' written work, collected and analyzed over a substantial period.

Formal Methods Applied to Complex Systems

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Publisher : John Wiley & Sons
ISBN 13 : 1119002923
Total Pages : 342 pages
Book Rating : 4.1/5 (19 download)

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Book Synopsis Formal Methods Applied to Complex Systems by : Jean-Louis Boulanger

Download or read book Formal Methods Applied to Complex Systems written by Jean-Louis Boulanger and published by John Wiley & Sons. This book was released on 2014-07-22 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents real-world examples of formal techniques in an industrial context. It covers formal methods such as SCADE and/or the B Method, in various fields such as railways, aeronautics, and the automotive industry. The purpose of this book is to present a summary of experience on the use of “formal methods” (based on formal techniques such as proof, abstract interpretation and model-checking) in industrial examples of complex systems, based on the experience of people currently involved in the creation and assessment of safety critical system software. The involvement of people from within the industry allows the authors to avoid the usual confidentiality problems which can arise and thus enables them to supply new useful information (photos, architecture plans, real examples, etc.).

The Math Olympian

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Publisher : FriesenPress
ISBN 13 : 1460258738
Total Pages : 165 pages
Book Rating : 4.4/5 (62 download)

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Book Synopsis The Math Olympian by : Richard Hoshino

Download or read book The Math Olympian written by Richard Hoshino and published by FriesenPress. This book was released on 2015-01-26 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: BETHANY MACDONALD HAS TRAINED SIX LONG YEARS FOR THIS MOMENT. SHE'LL TRY TO SOLVE FIVE QUESTIONS IN THREE HOURS, FOR ONE IMPROBABLE DREAM. THE DREAM OF REPRESENTING HER COUNTRY, AND BECOMING A MATH OLYMPIAN. As a small-town girl in Nova Scotia bullied for liking numbers more than boys, and lacking the encouragement of her unsupportive single mother who frowns at her daughter's unrealistic ambition, Bethany's road to the International Math Olympiad has been marked by numerous challenges. Through persistence, perseverance, and the support of innovative mentors who inspire her with a love of learning, Bethany confronts these challenges and develops the creativity and confidence to reach her potential. In training to become a world-champion "mathlete", Bethany discovers the heart of mathematics - a subject that's not about memorizing formulas, but rather about problem-solving and detecting patterns to uncover truth, as well as learning how to apply the deep and unexpected connections of mathematics to every aspect of her life, including athletics, spirituality, and environmental sustainability. As Bethany reflects on her long journey and envisions her exciting future, she realizes that she has shattered the misguided stereotype that only boys can excel in math, and discovers a sense of purpose that through mathematics, she can and she will make an extraordinary contribution to society.

Africa Since 1935

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Publisher : Univ of California Press
ISBN 13 : 9780520067035
Total Pages : 1076 pages
Book Rating : 4.0/5 (67 download)

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Book Synopsis Africa Since 1935 by : Unesco. International Scientific Committee for the Drafting of a General History of Africa

Download or read book Africa Since 1935 written by Unesco. International Scientific Committee for the Drafting of a General History of Africa and published by Univ of California Press. This book was released on 1999 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hardcover edition of volume 8 was published in 1994. This paperback edition is the eighth and final volume to be published in the UNESCO General History of Africa. Volume 8 examines the period from 1935 to the present, and details the role of African states in the Second World War and the rise of postwar Africa. This is one of the most important books in the entire series, and as such, it is an unabridged paperback.

Revisiting Moroccan Migrations

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Publisher : Routledge
ISBN 13 : 1317215303
Total Pages : 232 pages
Book Rating : 4.3/5 (172 download)

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Book Synopsis Revisiting Moroccan Migrations by : Mohammed Berriane

Download or read book Revisiting Moroccan Migrations written by Mohammed Berriane and published by Routledge. This book was released on 2018-02-02 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the 20th century, Morocco has become one of the world’s major emigration countries. But since 2000, growing immigration and settlement of migrants from sub-Saharan Africa, the Middle East, and Europe confronts Morocco with an entirely new set of social, cultural, political and legal issues. This book explores how continued emigration and increasing immigration is transforming contemporary Moroccan society, with a particular emphasis on the way the Moroccan state is dealing with shifting migratory realities. The authors of this collective volume embark on a dialogue between theory and empirical research, showcasing how contemporary migration theories help understanding recent trends in Moroccan migration, and, vice-versa, how the specific Moroccan case enriches migration theory. This perspective helps to overcome the still predominant Western-centric research view that artificially divide the world into ‘receiving’ and ‘sending’ countries and largely disregards the dynamics of and experiences with migration in countries in the Global South. This book was previously published as a special issue of The Journal of North African Studies.