Problemas de las empresas constructoras en relación con la construcción y conservación de carreteras
Author: Agrupación Nacional de Constructores de Obras Públicas (España)
Publisher:
Published: 1963
Total Pages: 0
ISBN-13:
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Author: Agrupación Nacional de Constructores de Obras Públicas (España)
Publisher:
Published: 1963
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKAuthor: Commission for Environmental Cooperation (Montréal, Québec). Secretariat
Publisher:
Published: 2001
Total Pages: 240
ISBN-13:
DOWNLOAD EBOOKThe North American Mosaic has four overarching features. First, it is, to the extent feasible, based on comparable information on the status and trends of major indicators of the state of the environment in Canada,Mexico, and the United States. Second, the report confirms that these three countries together make up an incredibly complex, dynamic, and interconnected ecosystem in which humans play a dominant and decisive role. Third, the report raises important and sometimes disquieting questions concerning the sustainability of some current trends. Finally, the report is a reminder that our economic, social, and physical well-being are utterly dependent on the life-sustaining services provided by nature. This report emphasizes the importance of developing mutually compatible economic, social, and environmental goals and policies across the three-country region.
Author: Marten Scheffer
Publisher: Springer Science & Business Media
Published: 2013-04-17
Total Pages: 378
ISBN-13: 1402031548
DOWNLOAD EBOOKEcology of Shallow Lakes brings together current understanding of the mechanisms that drive the diametrically opposite states of water clarity, shown by the cover paintings, found in many shallow lakes and ponds. It gives an outline of the knowledge gained from field observations, experimental work, and restoration studies, linked by a solid theoretical framework. The book focuses on shallow lakes, but the lucid treatment of plankton dynamics, resuspension, light climate and the role of vegetation is relevant to a much wider range of aquatic systems. The models that are used remain simple and most analyses are graphical rather than algebraic. The text will therefore appeal to students, scientists and policy makers in the field of ecology, fisheries, pollution studies and water management, and also to theoreticans who will benefit from the many real-world examples of topics such as predation and competition theory, bifurcation analysis and catastrophe theory. Perhaps most importantly, the book is a remarkable example of how large field experiments and simple models can catalyze our insight into complex ecosystems. Marten Scheffer wrote this book while at the Institute of Inland Water Management and Waste Treatment, RIZA, Lelystad, The Netherlands. He is currently at the Department of Water Quality Management and Aquatic Ecology of the Wageningen Agricultural University. Reviews `Much rarer are textbooks that so succinctly sum up the state-of-the-art knowledge about a subject that they become instant `bibles'. This book is one of these. It is probably one of the best biological textbooks I have read. Scheffer masterfully pulls all this information together under one cover and presents a coherent account, which will serve as a benchmark for the subject. The reader will not gain any great insight into the breeding biology of pike from this book, nor learn much about dragonflies or newts. They will, however, come to understand the essential nature of shallow lakes or, as the author puts it, `how shallow lakes work'. Overall, this book will be of great interest to practical and theoretical ecologists, students and managers in all fields of biology. All freshwater ecologists should certainly read it.' Simon Harrison in Journal of Ecology, 86 `The book by Scheffer can be seen as a milestone in the recognition of shallow lakes as a research topic in its own right. Scheffer uses three approaches concurrently to unravel the functioning of shallow lakes: 1) statistical analysis of large datasets from a variety of lakes; 2) simple abstract models made up of a few non-linear ordinary differential equations, which he calls `mini-models'; and 3) logical reasoning based on a mixture of results from fieldwork, experiments and models. What is new is that Scheffer links mathematics very nicely with what one feels is a correct description of the functioning of a shallow lake. Employing logical reasoning, Scheffer combines all these sources of knowledge into a general, coherent picture of the functioning of a shallow lake.' Wolf Mooij in Aquatic Ecology, 32
Author: Gerda K. Priestley
Publisher:
Published: 1996
Total Pages: 232
ISBN-13:
DOWNLOAD EBOOKAlthough widely advocated, sustainable tourism is subject to numerous interpretations -- from environmentally friendly forms of tourism to maintaining the economic viability of tourist activity in a specific place. This book explores various views on sustainable tourism and demonstrates its complexity and diversity, in order to clarify the issues in operational terms. It addresses questions such as: can tourist activity be sustainable economically; can tourism lead to sustainability from an environmental perspective; and what is the role of tourism as a sustainable development strategy? Much of the book consists of a series of European case studies, from the U.K., France, Spain, Italy and Greece. These case studies cover three main themes: recreation and tourism in natural and rural areas; coastal tourism; and islands. The book represents a valuable supplementary text for students of tourism, as well as related disciplines such as geography, economics, environmental management, and local and regional planning and development.
Author:
Publisher: UNICEF
Published: 2009
Total Pages: 244
ISBN-13: 9280643762
DOWNLOAD EBOOKThis Child-Friendly Schools (CFS) Manual was developed during three-and-a-half years of continuous work, involving the United Nations Children's Fund education staff and specialists from partner agencies working on quality education. It benefits from fieldwork in 155 countries and territories, evaluations carried out by the Regional Offices and desk reviews conducted by headquarters in New York. The manual is a part of a total resource package that includes an e-learning package for capacity-building in the use of CFS models and a collection of field case studies to illustrate the state of the art in child-friendly schools in a variety of settings.
Author:
Publisher:
Published: 1987
Total Pages: 88
ISBN-13:
DOWNLOAD EBOOKAuthor: Environmental Law Institute
Publisher: Environmental Law Institute
Published: 2003
Total Pages: 220
ISBN-13: 9781585760596
DOWNLOAD EBOOKThis publication describes the use of legal tools and incentives mechanisms for the conservation of private lands in Latin America, and assesses their implementation record. It reviews both mandatory provisions and the use of voluntary instruments such as easements and private reserve designations that have grown in use since the early 1990s. It ends with recommendations for an improved framework for private lands conservation, and presents model laws for the creation of private reserves and conservation easements.
Author: V. Kashturi Rangan
Publisher: John Wiley & Sons
Published: 2007-02-03
Total Pages: 455
ISBN-13: 0787988545
DOWNLOAD EBOOKBased on research presented at The Harvard Business School’s first-ever conference on business approaches to poverty alleviation, Business Solutions for the Global Poor brings together perspectives from leading academics and corporate, non-profit and public sector managers. The contributors draw on practical and dynamic how-to insights from leading BOP ventures from more than twenty countries world-wide. This important volume reflects poverty’s multi-faceted nature and a broad range of actors—multinational and local businesses, entrepreneurs, civil society organizations and governments—that play a role in its alleviation.
Author: Bernard Tschumi
Publisher: Rizzoli International Publications
Published: 2012
Total Pages: 784
ISBN-13:
DOWNLOAD EBOOKPhilosophy and architecture by Bernard Tschumi.