Xem 1-20 trên 75 kết quả Natural balance
  • International research on natural resource management advances in impact assessment Increased concern about the environmental and natural resource implications of agriculture has given rise to an emphasis on research that calls attention to these issues in developing countries. National and international agricultural research systems, including the research Centres under the Consultative Group on International Agricultural Research (CGIAR), have intensified research on natural resource management (NRM) both in terms of budget allocation and priority setting.

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  • In this important new book and presents the quintessential guide for gas engineers, emphasizing the practical aspects of natural gas production. Readers will learn to incorporate cutting-edge research in estimating reserves, evaluating the performance of fractured wells, processing gas, and material balance analysis; learn to evaluate future performance of gas reservoirs; learn to improve the performance of gas wells; and more.

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  • Surface water treatment is a controversial issue. A healthy balance between possible risks, such as immediate microbiological contamination and long-term carcinogenic effects due to dsinfection byproducts, and the treatment costs is required. Another issue of concern relates to drinking water standards, whch seem unreasonably strict in some countries and practically absent in others. The price people are required to pap for their water varies with the standards.

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  • Abstract Man is an omnivore and originally met energy requirements by hunting and gathering. Man evolved in an environment of feast and famine: there were periods with either a positive or negative energy balance. As an introduction to human energetics, this book on energy balance in motion starts with a chapter on animal energetics. How do animals survive and reproduce in an environment with a variable food supply? The examples on animal energetics illustrate how animals grow, reproduce and survive periods of starvation.

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  • The present text introduces the use of population balances in the context of batch wet granulation and coating systems and it reviews the latest achievements and proposals in the scientific literature in this field. The nature and framework of population balance theory are highlighted and one-dimensional population balances are introduced from scratch. This may seems tedious at first but the derivation of even the simplest population balances is nevertheless not an easy task, and it is in fact difficult to find complete derivations elsewhere in literature.

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  • This paper describes a novel instancebased sentence boundary determination method for natural language generation that optimizes a set of criteria based on examples in a corpus. Compared to existing sentence boundary determination approaches, our work offers three significant contributions. First, our approach provides a general domain independent framework that effectively addresses sentence boundary determination by balancing a comprehensive set of sentence complexity and quality related constraints.

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  • Forex – What is it? The international currency market Forex is a special kind of the world financia market. Trader’s purpose on the Forex to get profit as the result of foreign currencies purchase and sale. The exchange rates of all currencies being in the market turnover are permanently changing under the action of the demand and supply alteration. The latter is a strong subject to the influence of any important for the human society event in the sphere of economy, politics and nature.

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  • Water is finite on earth. There is a fixed amount of water which neither decreases or increases. Fresh water is a renewable resource because of the water cycle. From a human perspective the source of freshwater is rainfall. Most of this rainfall is used directly for vegetative growth, such as natural vegetation, pasture, rain-fed maize etc. This process, known as transpiration, is highly productive and produces in Southern Africa the bulk of food crops.

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  • Soil erosion affects a large part of the Earth surface, and it represents one of the most relevant environmental problems worldwide. Intense land degradation processes that destroyed civilizations in the past are still going on at present. Accelerated soil erosion is one of the main soil threats, as the natural balance between soil formation and loss may be seriously compromised, leading to desertification and permanent loss of fertility and protective function. Soil erosion is not only related to agricultural activities and farming practices, but also to land management in general....

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  • We are living on an increasingly urban planet. In 2008 we passed the halfway mark—50% of the world’s population now live in cities, and that percentage is projected to increase to 70% by 2050. There is no turning back the urban trend. Yet ironically we have as a species yet to successfully design and plan cities that will accommodate our economic and demographic needs while uplifting and elevating us, and protect, restore, and nurture the planet and its natural systems.

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  • Soil fertility is critical for the provision of adequate food, fiber and renewable natural resources(fuel,wood etc.). In the developing world soil fertility is linked to economic well being of many farm families. Poor soils means poor harvest leading to low returns for the over 60% of the population of developing countries relying on agriculture for survival.Use of inorganic and organic fertilizers in addition to biological processes to improve the fertility of the soil requires good understanding of their practical use and management.

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  • Conserving Living Natural Resources provides students, managers, and general readers with an introduction to the principles of managing biological resources. It presents the historical and conceptual contexts of three seminal approaches to the management of living natural resources: utilitarian management for harvest of featured species and control of unwanted species, protection and restoration of populations and habitats to maintain biodiversity, and management of complex ecosystems to sustain both productivity and biodiversity.

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  • IN BOTH NATURAL AND AGRICULTURAL CONDITIONS, plants are frequently exposed to environmental stresses. Some environmental factors, such as air temperature, can become stressful in just a few minutes; others, such as soil water content, may take days to weeks, and factors such as soil mineral deficiencies can take months to become stressful. It has been estimated that because of stress resulting from climatic and soil conditions (abiotic factors) that are suboptimal, the yield of field-grown crops in the United States is only 22% of the genetic potential yield (Boyer 1982).

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  • THE CONVERSION OF SOLAR ENERGY to the chemical energy of organic compounds is a complex process that includes electron transport and photosynthetic carbon metabolism (see Chapters 7 and 8). Earlier discussions of the photochemical and biochemical reactions of photosynthesis should not overshadow the fact that, under natural conditions, the photosynthetic process takes place in intact organisms that are continuously responding to internal and external changes. This chapter addresses some of the photosynthetic responses of the intact leaf to its environment....

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  • Since the financial crisis, there has been renewed interest in documenting the balance- sheet positions of financial institutions. We share the important goal of this literature: to come up with data on positions that will inform the theoretical modeling of these insti- tutions, as called for by Franklin Allen in his 2001 AFA presidential address. Adrian and Shin (2011) investigate the behavior of Value-at-Risk measures reported by investment banks.

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  • IN NATURAL HABITATS, plants are surrounded by an enormous number of potential enemies. Nearly all ecosystems contain a wide variety of bacteria, viruses, fungi, nematodes, mites, insects, mammals, and other herbivorous animals. By their nature, plants cannot avoid these herbivores and pathogens simply by moving away; they must protect themselves in other ways. The cuticle (a waxy outer layer) and the periderm (secondary protective tissue), besides retarding water loss, provide barriers to bacterial and fungal entry.

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  • Harrison's Internal Medicine Chapter 59. Bleeding and Thrombosis Bleeding and Thrombosis: Introduction The human hemostatic system provides a natural balance between procoagulant and anticoagulant forces. The procoagulant forces include platelet adhesion and aggregation and fibrin clot formation; anticoagulant forces include the natural inhibitors of coagulation and fibrinolysis. Under normal circumstances, hemostasis is regulated to promote blood flow; however, it is also prepared to clot blood rapidly to arrest blood flow and prevent exsanguination.

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  • The need for a money market arises because receipts of economic units do not coincide with their expenditures. These units can hold money balances—that is, transactions balances in the form of currency, demand deposits, or NOW accounts—to insure that planned expenditures can be maintained independently of cash receipts. Holding these balances, however, involves a cost in the form of foregone interest. To minimize this cost, economic units usually seek to hold the minimum money balances required for day-to- day transactions.

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  • This book is an expression of gratitude for my incredible good for- tune to be immersed in the world of projects while meeting the teachings of the wisdom traditions of Yoga, Taoism, Advaita Vedanta and Buddhism. From these teachings and their application in complex organizations performing complex projects, I am better able to under- stand the essence of the many attempts to express the nature of our shared experience. I wish to thank first my wife Linda, a fellow traveler and the loving mirror who helps me to see myself as I am and as I can be. Thanks...

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  • The author is grateful for the extensive and valuable comments and input provided by Pisupati Balakrishna, Susie Brownlie, Markus Burgener, Stas Burgiel, Douglas Butterworth, Faith Campbell,Nyasha Chishakwe, Kevern Cochrane, Keith Davenport, Barney Dickson, Jonathon Ekstrom, Jonathan Evans, Sarah Fowler, Mark Halle, Virginia Gascon Gonzales, Meira Hanson, Jeff Hayward,Michael Heazle, Ryan Hill, Paul Holthus, Jon Hutton,Mark Infield, the International Council ofMines andMining BiodiversityWorking Group, Bill Jackson, Yoshio Kaneko, Tim Low, Sue Mainka, Teresa Mulliken, Sheelagh O’Rei...

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