Sur les interactions des deux MLI d'une conversion réversible alternatif fréquence fixe, alternatif fréquence variable

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Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis Sur les interactions des deux MLI d'une conversion réversible alternatif fréquence fixe, alternatif fréquence variable by : Michel Ostojski

Download or read book Sur les interactions des deux MLI d'une conversion réversible alternatif fréquence fixe, alternatif fréquence variable written by Michel Ostojski and published by . This book was released on 1994 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'association d'un redresseur et d'un onduleur de courant est de plus en plus souvent etudiee et utilisee dans les entrainements de moteur asynchrone. Une inductance relie les deux convertisseurs et des condensateurs sont connectes aux bornes du moteur pour que l'ensemble de la charge de l'onduleur se comporte comme un recepteur de tension. Du point de vue du moteur, le contenu harmonique ne doit contenir ni de composantes harmoniques proches de la frequence de resonance du circuit de sortie, ni de composantes sous-harmoniques de facon a eviter les pulsations genantes de couple. Le contenu harmonique des courants d'entree et de sortie de l'association redresseur-onduleur depend des interactions entre les fonctions de commutation du redresseur et de l'onduleur. Les conditions generales que doivent remplir ces deux fonctions de commutation sont etablies en relation avec les valeurs de l'inductance de la maille continue et de la frequence de resonance du circuit de sortie. Deux fonctions de commutation qui remplissent ces conditions sont decrites, et une simulation numerique du systeme etudie valide ces conditions. Puis, les effets de l'inductance de la maille continue sur les interactions entre les deux fonctions de commutation sont etudiees. Les trois principales influences de l'inductance de la maille continue dans une association redresseur-onduleur pour un entrainement de moteur asynchrone, en relation avec les parametres de la charge de l'onduleur, sont donnees quantitativement ; ce sont les influences sur le contenu sous-harmoniques des courants d'entree et de sortie, sur les surtensions de sortie, et sur les pulsations de couple moteur.

Ecology

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Publisher : Benjamin-Cummings Publishing Company
ISBN 13 : 9780321068798
Total Pages : 695 pages
Book Rating : 4.0/5 (687 download)

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Book Synopsis Ecology by : Charles J. Krebs

Download or read book Ecology written by Charles J. Krebs and published by Benjamin-Cummings Publishing Company. This book was released on 2001 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: This best-selling majors ecology book continues to present ecology as a series of problems for readers to critically analyze. No other text presents analytical, quantitative, and statistical ecological information in an equally accessible style. Reflecting the way ecologists actually practice, the book emphasizes the role of experiments in testing ecological ideas and discusses many contemporary and controversial problems related to distribution and abundance. Throughout the book, Krebs thoroughly explains the application of mathematical concepts in ecology while reinforcing these concepts with research references, examples, and interesting end-of-chapter review questions. Thoroughly updated with new examples and references, the book now features a new full-color design and is accompanied by an art CD-ROM for instructors. The field package also includes The Ecology Action Guide, a guide that encourages readers to be environmentally responsible citizens, and a subscription to The Ecology Place (www.ecologyplace.com), a web site and CD-ROM that enables users to become virtual field ecologists by performing experiments such as estimating the number of mice on an imaginary island or restoring prairie land in Iowa. For college instructors and students.

Livestock's Long Shadow

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Publisher : Food & Agriculture Org.
ISBN 13 : 9789251055717
Total Pages : 418 pages
Book Rating : 4.0/5 (557 download)

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Book Synopsis Livestock's Long Shadow by : Henning Steinfeld

Download or read book Livestock's Long Shadow written by Henning Steinfeld and published by Food & Agriculture Org.. This book was released on 2006 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The assessment builds on the work of the Livestock, Environment and Development (LEAD) Initiative"--Pref.

The Regional Impacts of Climate Change

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Publisher : Cambridge University Press
ISBN 13 : 9780521634557
Total Pages : 532 pages
Book Rating : 4.6/5 (345 download)

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Book Synopsis The Regional Impacts of Climate Change by : Intergovernmental Panel on Climate Change. Working Group II.

Download or read book The Regional Impacts of Climate Change written by Intergovernmental Panel on Climate Change. Working Group II. and published by Cambridge University Press. This book was released on 1998 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cambridge, UK : Cambridge University Press, 1998.

The State of the World's Biodiversity for Food and Agriculture

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Publisher : Food & Agriculture Org.
ISBN 13 : 9251312702
Total Pages : 576 pages
Book Rating : 4.2/5 (513 download)

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Book Synopsis The State of the World's Biodiversity for Food and Agriculture by : Food and Agriculture Organization of the United Nations

Download or read book The State of the World's Biodiversity for Food and Agriculture written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2019-03-12 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: The State of the World's Biodiversity for Food and Agriculture presents the first global assessment of biodiversity for food and agriculture worldwide. Biodiversity for food and agriculture is the diversity of plants, animals and micro-organisms at genetic, species and ecosystem levels, present in and around crop, livestock, forest and aquatic production systems. It is essential to the structure, functions and processes of these systems, to livelihoods and food security, and to the supply of a wide range of ecosystem services. It has been managed or influenced by farmers, livestock keepers, forest dwellers, fish farmers and fisherfolk for hundreds of generations. Prepared through a participatory, country-driven process, the report draws on information from 91 country reports to provide a description of the roles and importance of biodiversity for food and agriculture, the drivers of change affecting it and its current status and trends. It describes the state of efforts to promote the sustainable use and conservation of biodiversity for food and agriculture, including through the development of supporting policies, legal frameworks, institutions and capacities. It concludes with a discussion of needs and challenges in the future management of biodiversity for food and agriculture. The report complements other global assessments prepared under the auspices of the Commission on Genetic Resources for Food and Agriculture, which have focused on the state of genetic resources within particular sectors of food and agriculture.

Fundamentals of Geomorphology

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Publisher : Routledge
ISBN 13 : 1135281130
Total Pages : 909 pages
Book Rating : 4.1/5 (352 download)

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Book Synopsis Fundamentals of Geomorphology by : Richard John Huggett

Download or read book Fundamentals of Geomorphology written by Richard John Huggett and published by Routledge. This book was released on 2011-03-15 with total page 909 pages. Available in PDF, EPUB and Kindle. Book excerpt: This extensively revised, restructured, and updated edition continues to present an engaging and comprehensive introduction to the subject, exploring the world’s landforms from a broad systems perspective. It covers the basics of Earth surface forms and processes, while reflecting on the latest developments in the field. Fundamentals of Geomorphology begins with a consideration of the nature of geomorphology, process and form, history, and geomorphic systems, and moves on to discuss: structure: structural landforms associated with plate tectonics and those associated with volcanoes, impact craters, and folds, faults, and joints process and form: landforms resulting from, or influenced by, the exogenic agencies of weathering, running water, flowing ice and meltwater, ground ice and frost, the wind, and the sea; landforms developed on limestone; and landscape evolution, a discussion of ancient landforms, including palaeosurfaces, stagnant landscape features, and evolutionary aspects of landscape change. This third edition has been fully updated to include a clearer initial explanation of the nature of geomorphology, of land surface process and form, and of land-surface change over different timescales. The text has been restructured to incorporate information on geomorphic materials and processes at more suitable points in the book. Finally, historical geomorphology has been integrated throughout the text to reflect the importance of history in all aspects of geomorphology. Fundamentals of Geomorphology provides a stimulating and innovative perspective on the key topics and debates within the field of geomorphology. Written in an accessible and lively manner, it includes guides to further reading, chapter summaries, and an extensive glossary of key terms. The book is also illustrated throughout with over 200 informative diagrams and attractive photographs, all in colour.

Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation

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Publisher : Cambridge University Press
ISBN 13 : 1107025060
Total Pages : 593 pages
Book Rating : 4.1/5 (7 download)

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Book Synopsis Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation by : Intergovernmental Panel on Climate Change

Download or read book Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation written by Intergovernmental Panel on Climate Change and published by Cambridge University Press. This book was released on 2012-05-28 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extreme weather and climate events, interacting with exposed and vulnerable human and natural systems, can lead to disasters. This Special Report explores the social as well as physical dimensions of weather- and climate-related disasters, considering opportunities for managing risks at local to international scales. SREX was approved and accepted by the Intergovernmental Panel on Climate Change (IPCC) on 18 November 2011 in Kampala, Uganda.

Reservoir Sedimentation Handbook

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Publisher : McGraw Hill Professional
ISBN 13 : 9780070433021
Total Pages : 864 pages
Book Rating : 4.4/5 (33 download)

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Book Synopsis Reservoir Sedimentation Handbook by : Gregory L. Morris

Download or read book Reservoir Sedimentation Handbook written by Gregory L. Morris and published by McGraw Hill Professional. This book was released on 1998 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on reservoir sedimentation management and control, this work defines the nature and severity of sedimentation, reviews relevant physical processes, describes techniques used to combat sedimentation, and presents detailed case studies.

Building Resilience to Climate Change

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Publisher : IUCN
ISBN 13 : 2831712904
Total Pages : 85 pages
Book Rating : 4.8/5 (317 download)

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Book Synopsis Building Resilience to Climate Change by : Angela Andrade Pérez

Download or read book Building Resilience to Climate Change written by Angela Andrade Pérez and published by IUCN. This book was released on 2010 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: With climate change now a certainty, the question is how much change there will be and what can be done about it. One of the answers is through adaptation. Many of the lessons that are being learned in adaptation are from success stories from the field. This publication contains eleven case studies covering different ecosystems and regions around the world. Its aim is to summarize some current applications of the Ecosystem-Based Adaptation concept and its tools used around the world, and also draw lessons from experiences in conservation adaptation.

The Water Resource in Tropical Africa and Its Exploitation

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Publisher : ILRI (aka ILCA and ILRAD)
ISBN 13 : 9789290530435
Total Pages : 120 pages
Book Rating : 4.5/5 (34 download)

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Book Synopsis The Water Resource in Tropical Africa and Its Exploitation by : K. A. Edwards

Download or read book The Water Resource in Tropical Africa and Its Exploitation written by K. A. Edwards and published by ILRI (aka ILCA and ILRAD). This book was released on 1983-01-01 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Dry Forests and Woodlands of Africa

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Publisher : Routledge
ISBN 13 : 1136531378
Total Pages : 294 pages
Book Rating : 4.1/5 (365 download)

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Book Synopsis The Dry Forests and Woodlands of Africa by : Emmanuel N. Chidumayo

Download or read book The Dry Forests and Woodlands of Africa written by Emmanuel N. Chidumayo and published by Routledge. This book was released on 2010-09-23 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dry forests and woodlands of Sub-Saharan Africa are major ecosystems, with a broad range of strong economic and cultural incentives for keeping them intact. However, few people are aware of their importance, compared to tropical rainforests, despite them being home to more than half of the continent's population. This unique book brings together scientific knowledge on this topic from East, West, and Southern Africa and describes the relationships between forests, woodlands, people and their livelihoods. Dry forest is defined as vegetation dominated by woody plants, primarily trees, the canopy of which covers more than 10 per cent of the ground surface, occurring in climates with a dry season of three months or more. This broad definition - wider than those used by many authors - incorporates vegetation types commonly termed woodland, shrubland, thicket, savanna, wooded grassland, as well as dry forest in its strict sense. The book provides a comparative analysis of management experiences from the different geographic regions, emphasizing the need to balance the utilization of dry forests and woodland products between current and future human needs. Further, the book explores the techniques and strategies that can be deployed to improve the management of African dry forests and woodlands for the benefit of all, but more importantly, the communities that live off these vegetation formations. Thus, the book lays a foundation for improving the management of dry forests and woodlands for the wide range of products and services they provide.

The impact of disasters and crises on agriculture and food security: 2021

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Publisher : Food & Agriculture Org.
ISBN 13 : 9251340714
Total Pages : 245 pages
Book Rating : 4.2/5 (513 download)

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Book Synopsis The impact of disasters and crises on agriculture and food security: 2021 by : Food and Agriculture Organization of the United Nations

Download or read book The impact of disasters and crises on agriculture and food security: 2021 written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2021-03-17 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: On top of a decade of exacerbated disaster loss, exceptional global heat, retreating ice and rising sea levels, humanity and our food security face a range of new and unprecedented hazards, such as megafires, extreme weather events, desert locust swarms of magnitudes previously unseen, and the COVID-19 pandemic. Agriculture underpins the livelihoods of over 2.5 billion people – most of them in low-income developing countries – and remains a key driver of development. At no other point in history has agriculture been faced with such an array of familiar and unfamiliar risks, interacting in a hyperconnected world and a precipitously changing landscape. And agriculture continues to absorb a disproportionate share of the damage and loss wrought by disasters. Their growing frequency and intensity, along with the systemic nature of risk, are upending people’s lives, devastating livelihoods, and jeopardizing our entire food system. This report makes a powerful case for investing in resilience and disaster risk reduction – especially data gathering and analysis for evidence informed action – to ensure agriculture’s crucial role in achieving the future we want.

Mediterranean Coastal Lagoons

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Publisher : Food & Agriculture Organization of the UN (FAO)
ISBN 13 :
Total Pages : 294 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Mediterranean Coastal Lagoons by : S. Cataudella

Download or read book Mediterranean Coastal Lagoons written by S. Cataudella and published by Food & Agriculture Organization of the UN (FAO). This book was released on 2015 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Mediterranean region hosts around 400 coastal lagoons, covering a surface of over 641 000 ha differing in both their typology and use. Fisheries and various forms of aquaculture have been traditionally carried out in Mediterranean coastal lagoons since ancient times and are part of the cultural heritage of the region. Traditional lagoon management linked to extensive aquaculture and fish harvesting has certainly contributed, over time, to preserve these peculiar ecosystems, although much of the coastal lagoon areas have progressively disappeared due to land reclamation and other uses. Recently, coastal lagoons have become a relevant environmental concern: land claiming, pollution and the lack of management, among other factors, have strongly modified both the structure and functioning of these sensitive coastal ecosystems. In particular, the management of traditional aquaculture and capture fisheries activities has been identified as the main instrument to maintain lagoons' ecological features and to prevent the degradation of their sensitive habitats, both from an environmental and socioeconomic point of view. To guarantee the sustainability of aquaculture and capture fisheries in lagoons, proper management plans should be established so as to ensure the preservation of both biodiversity and local knowledge. This should also be considered as a fundamental pillar for any programme aiming at the preservation and restoration of lagoons' environment."--Publisher's description.

Temper Sands in Prehistoric Oceanian Pottery

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Publisher : Geological Society of America
ISBN 13 : 0813724066
Total Pages : 176 pages
Book Rating : 4.8/5 (137 download)

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Book Synopsis Temper Sands in Prehistoric Oceanian Pottery by : William R. Dickinson

Download or read book Temper Sands in Prehistoric Oceanian Pottery written by William R. Dickinson and published by Geological Society of America. This book was released on 2006-01-01 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Oceanian ceramic cultures making earthenware pottery spread during the past 3500 years through a dozen major island groups spanning 6000 km of the tropical Pacific Ocean from western Micronesia to western Polynesia. Island potters mixed sand as temper into clay bodies during ceramic manufacture. The nature of island sands is governed by the geotectonics of hotspot chains, island arcs, subduction zones, backarc basins, and remnant arcs as well as by sedimentology. Because small islands with bedrock exposures of restricted character are virtual point sources of sand, many tempers are diagnostic of specific islands. Petrographic study of temper sands in thin section allows distinction between indigenous pottery and exotic pottery transported from elsewhere. Study of 2223 prehistoric Oceanian potsherds from 130 islands and island clusters indicates the nature of Oceanian temper types and documents 105 cases of interisland transport of ceramics over distances typically

Madagascar

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Publisher :
ISBN 13 :
Total Pages : 396 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Madagascar by : M. D. Jenkins

Download or read book Madagascar written by M. D. Jenkins and published by . This book was released on 1987 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Quality of Government

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Publisher : University of Chicago Press
ISBN 13 : 0226729575
Total Pages : 301 pages
Book Rating : 4.2/5 (267 download)

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Book Synopsis The Quality of Government by : Bo Rothstein

Download or read book The Quality of Government written by Bo Rothstein and published by University of Chicago Press. This book was released on 2011-09 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relationship between government, virtue, and wealth has held a special fascination since Aristotle, and the importance of each frames policy debates today in both developed and developing countries. While it’s clear that low-quality government institutions have tremendous negative effects on the health and wealth of societies, the criteria for good governance remain far from clear. In this pathbreaking book, leading political scientist Bo Rothstein provides a theoretical foundation for empirical analysis on the connection between the quality of government and important economic, political, and social outcomes. Focusing on the effects of government policies, he argues that unpredictable actions constitute a severe impediment to economic growth and development—and that a basic characteristic of quality government is impartiality in the exercise of power. This is borne out by cross-sectional analyses, experimental studies, and in-depth historical investigations. Timely and topical, The Quality of Government tackles such issues as political legitimacy, social capital, and corruption.

Second Assessment of Transboundary Rivers, Lakes and Groundwaters

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Publisher :
ISBN 13 :
Total Pages : 448 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Second Assessment of Transboundary Rivers, Lakes and Groundwaters by :

Download or read book Second Assessment of Transboundary Rivers, Lakes and Groundwaters written by and published by . This book was released on 2011 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examines the quality and volume of all international rivers, lakes, wetlands, and groundwater in Europe, Central Asia, and the Caucasus. Also addresses related laws and policies.