Author: Mamadou Dieye
Publisher:
ISBN:
Category :
Languages : fr
Pages : 151
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Book Description
Cette contribution à l'étude du comportement dynamique du procédé de rectification plane passe profonde est axée sur l'influence des paramètres d'usinage (formes géométriques, états de surface...) et du milieu environnement. Après une étude bibliographique, plusieurs simulations sont effectuées dans l'environnement de la rectifieuse Danobat (LGB), pour évaluer la stabilité du système par l'exploitation des lobes de stabilité. L'évaluation de la stabilité du système POM est analysée en fonction de chacun des paramètres (masse, raideurs et amortissements) retenus pour cette étude. L'objectif de la suite est de proposer un modèle de simulation du comportement dynamique du procédé de rectification plane en passe profonde. Spécifiquement, nous cherchons à prédire l'ondulation de la surface rectifiée (la profondeur de passe) en fonction de la nature des constituants du système POM. Nous proposons, dans un premier temps, une modélisation mécanique tenant compte des paramètres opératoires et des caractéristiques géométriques et mécaniques de la pièce, de l‘outil et de la machine. Les modèles sont fondés sur le principe fondamental de la dynamique, sur la méthode énergétique avec diverses hypothèses sur le contact meule pièce. Dans un second temps, des simulations numériques (Simulink) sont proposées suivant un plan d'expérience (5 facteurs à 2 niveaux) en vue d'évaluer l'ondulation du profil ainsi que la stabilité et la précision des présents modèles.
Author: Michael Cowen
Publisher:
ISBN:
Category : Literary Collections
Languages : en
Pages : 404
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Book Description
This volume contains electoral studies of multiparty politics in 14 African countries during the 1990s. Most are about national elections in Anglophone Africa. There are also less well-known examples from Sudan, Ethiopia and Guinea Bissau. The collection also features studies of the local elections in Namibia and of a significant by-election in Malawi. The multiparty period had been put, wherever possible, within the historical context of earlier elections in Africa. Questions addressed include: how did incumbent governing regimes learn to live with multiparty politics? Why have some elections been so closely fought and others have suffered from apathy? Why has there been relatively open political expression and activity when the elections have increased the political and economic manipulation by incumbent governments? Why have the elections of the 1990s been so marked by local and ethnic variations? To what extent did this wave of democracy result from pressure from donor countries?
Author:
Publisher: Gramercy
ISBN: 9780517183670
Category : Reference
Languages : en
Pages : 1032
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Book Description
Here is the most competitive. most up-to-date (1997 copyright) unabridged dictionary on the promotional market today. The 700-page A-Z contains 100,000 entries and is set in a highly readable 3-column format. In addition. there are 324 pages of special reference guides. 800 illustrations throughout.
Author: Claudia Haarmann
Publisher:
ISBN:
Category : Development projects
Languages : en
Pages : 112
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Book Description
Author: ASSISTANT PROFESSOR OF URBAN PLANNING CLARA. IRAZABAL
Publisher: Routledge
ISBN: 9781138266650
Category : City planning
Languages : en
Pages : 352
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Book Description
Cities in both North and South America are confronting tremendous challenges in urban growth and management as they enter the new century. Curitiba in Brazil and Portland in Oregon, US are cities that have achieved recognition for exemplary urban planning programmes over the past three decades. As such, they provide particularly useful illustrations of the intense development pressures that many urban areas currently face. This book explores the dynamics of their urban governance, arguing that, in general, there has been a unique synergy derived from the combination of visionary leadership, innovative urban plans and effective citizen involvement. The book argues that, while urban design and architecture are key to the success in making cities livable and in augmenting the global reputations, such sensitive, innovative urban planning and design projects first need to be governed effectively and grounded within the specifics of their local cultures and existing built environments.
Author: Hugh H. Schwartz
Publisher:
ISBN:
Category : Business & Economics
Languages : en
Pages : 176
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Book Description
The first major account in English of one of the most successful urban renewals of the Twentieth Century, highlighting implementation of development visions. Likely to be of special interest to Latin Americanist, Urban Planners, and Transportation and Behavioral Economists
Author: Gerardo Otero
Publisher: University of Texas Press
ISBN: 0292717709
Category : Business & Economics
Languages : en
Pages : 339
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Book Description
Recent decades have seen tremendous changes in Latin America's agricultural sector, resulting from a broad program of liberalization instigated under pressure from the United States, the IMF, and the World Bank. Tariffs have been lifted, agricultural markets have been opened and privatized, land reform policies have been restricted or eliminated, and the perspective has shifted radically toward exportation rather than toward the goal of feeding local citizens. Examining the impact of these transformations, the contributors to Food for the Few: Neoliberal Globalism and Biotechnology in Latin America paint a somber portrait, describing local peasant farmers who have been made responsible for protecting impossibly vast areas of biodiversity, or are forced to specialize in one genetically modified crop, or who become low-wage workers within a capitalized farm complex. Using dozens of examples such as these, the deleterious consequences are surveyed from the perspectives of experts in diverse fields, including anthropology, economics, geography, political science, and sociology. From Kathy McAfee's "Exporting Crop Biotechnology: The Myth of Molecular Miracles," to Liz Fitting's "Importing Corn, Exporting Labor: The Neoliberal Corn Regime, GMOs, and the Erosion of Mexican Biodiversity," Food for the Few balances disturbing findings with hopeful assessments of emerging grassroots alternatives. Surveying not only the Latin American conditions that led to bankruptcy for countless farmers but also the North's practices, such as the heavy subsidies implemented to protect North American farmers, these essays represent a comprehensive, keenly informed response to a pivotal global crisis.
Author: Desmond Morris
Publisher:
ISBN:
Category : Sign language
Languages : en
Pages : 296
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Book Description
Author:
Publisher:
ISBN: 9781845850050
Category : Sewage
Languages : en
Pages : 932
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Book Description
