Xem 1-20 trên 239 kết quả Population change
  • An analysis of the complex relationship between demographic changes and impacts on the natural-resource base confirms that resource exploitation is occurring not only to meet growing domestic needs but also for other vested interests. Population, together with other major drivers, such as institutions, markets, and technology, will have a very strong bearing on the way in which the rich resources of the Mekong River Basin are developed and distributed in the present and future.

    pdf7p nguyenngocsonctu 02-12-2010 106 18   Download

  • Anomalous climatic outcomes such as higher temperatures, intense rainfall and flood, frequent and severe droughts are now at the new level. Without appropriate adaptation measures, climate change is bound to exacerbate vulnerability of society, place food security and human health at risk, threaten the lives of growing urban population and impede the goal of attaining sustainable development. The human and social dimensions of climate change, including climate policy, are essential parts of our response to the many challenges emanating from climate change....

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  • Kenyan’s livelihoods are closely linked to their access to natural resources. As our population increases and environmental quality continues to decline, there is an increased risk of social and economic destabilization, which will have signifi cant impacts on overall national security. Rural people are among the most vulnerable and insecure in terms of poverty, health, food security, economic losses, and confl icts resulting from competitive access to natural resources, among other factors....

    pdf168p japet75 30-01-2013 19 6   Download

  • Cimate change is one of the most important global environmental problems facing the world today. Evidence of a changing climate is all around us, from rising sea level to retreating mountain glaciers, melting Arctic sea ice, lengthening growing seasons, shifting animal migration patterns, and other changes. Such changes are already having adverse impacts on people’s well-being, as climate change amplifies the effects of other environmental and socioeconomic changes and problems and produces new effects of its own.

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  • Population geneticists study the genetic composition and variability of natural populations as well as the theories that explain this variability in terms of natural selection, mutation, recombination, genetic drift and gene flow. Population genetics was first developed among eukaryotes in an attempt to reconcile Darwin’s theory of evolution by natural selection and Mendelian genetics. When Darwin postulated that natural selection is the main force of evolutionary change, a great controversy was created.

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  • A major task of our time is to ensure adequate food supplies for the world’s current population (now nearing 7 billion) in a sustainable way while protecting the vital functions and biological diversity of the global environment. The task of providing for a growing population is likely to be even more difficult in view of actual and potential changes in climatic conditions due to global warming, and as the population continues to grow. Current projections suggest that the world’s temperatures will rise 1.8–4.

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  • English noun/verb (N/V) pairs (contract, cement) have undergone complex patterns of change between 3 stress patterns for several centuries. We describe a longitudinal dataset of N/V pair pronunciations, leading to a set of properties to be accounted for by any computational model. We analyze the dynamics of 5 dynamical systems models of linguistic populations, each derived from a model of learning by individuals.

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  • The paper argues that language change can be explained through the stochasticity observed in real-world natural language use. This thesis is demonstrated by modeling language use through language games played in an evolving population of agents. We show that the artificial languages which the agents spontaneously develop based on self-organisation, do not evolve even if the population is changing.

    pdf8p bunrieu_1 18-04-2013 11 2   Download

  • Chapter 19 - Variation and selection in populations. This chapter involves the study of how genetic laws impact the genetic makeup of a population. Mendelian principles are the basis for the Hardy-Weinberg law which allows one to calculate allele and genotype frequencies from one generation to the next. The Hardy-Weinberg law can be used only if other forces are not acting on the allele frequency. Those forces include selection, migration, mutation, and population size.

    ppt54p tangtuy04 12-03-2016 6 2   Download

  • . The Council of Europe has a long tradition of producing population studies, and the work of the European Population Committee contributes to the understanding of the relationship between social policy and demographic issues in Europe. The findings of this work are published in the series Population studies, where topics covered include migration flows, national minorities, demographic changes and the labour market, the ageing of European populations and the demographic consequences of economic transition. These publications provide...

    pdf152p mymi0809 19-01-2013 18 1   Download

  • Tham khảo sách 'dynamic changes in marine ecosystems', nông - lâm - ngư, nông nghiệp phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf168p lyly_5 22-03-2013 10 1   Download

  • Rice area of the Mekong Delta (MD) has decreased in recent years, especially the shift from rice land into land for industrial parks and saline land due to sea level rise and effects of climate change. In addition, the rate of population growth also requires increasingly high demand for rice in the region. By using the model, results showed that the population of the Mekong Delta will be at 26,956.5 thousand inhabitants,

    pdf0p hailedangbs 02-05-2013 20 1   Download

  • This chapter students will be able to: Recognize that natural selection is the correct mechanism for explain evolution; understand the importance of and identify sources of genetic variation; know how to solve various problems associated with Hardy-Weinberg equilibrium; list the five factors, and state an example of each, that affect Hardy-Weinberg equilibrium and understand how each can produce evolutionary changes in a population experiencing any one of the five;...

    ppt54p tangtuy07 02-04-2016 4 1   Download

  • Viet Nam is considered as one of the most vulnerable countries due to CC and sea level rise. If sea level rise of 1 m, Viet Nam will loose about 12% of land, 23% of population will be affected. Typhoons occur more frequently with higher intensity. Temperature increases and change in rainfall pattern will affect agriculture and water resources.

    pdf17p hoangdung 15-03-2009 488 146   Download

  • Recently, Vietnam has been grown vastly on all economic fields. From the period 'doi moi' to the present, there many changes and you can get a lot of experiences from reading this work.Vietnamese version is available.All rights reserved. You may download, display, print and reproduce this material in unaltered form only (retaining this notice) for your personal, noncommercial use or use within your organization.

    pdf338p jolie 02-03-2009 253 90   Download

  • As the world grapples with the massive effects of climate change and global warming, the need to understand the embedded issues associated with these complex ecological transformations becomes clear. PolicyLink commissioned Understanding Climate Change: An Equitable Framework to contribute to a deeper understanding of the issues and to encourage everyone to participate in the discussion and to weigh in on proposed solutions.

    pdf43p vantrungtran 01-02-2010 124 56   Download

  • Water and wastewater utilities across the country are facing many common challenges, including rising costs, aging infrastructure, increasingly stringent regulatory requirements, population changes, and a rapidly changing workforce. Effective utility management can help utilities respond to both current and future challenges and support utilities in their common mission of being successful 21st century service providers.

    pdf454p conrepcon 12-04-2012 72 18   Download

  • Exact evidence about incidence of sleep disorders in patients with epilepsy is not available, but it is supposed, that the amount is higher in patients with epilepsy than in general population. For example patients with partial epilepsy have twice higher appearence of sleep disorders as in healthy group (39% vs 18%) (Bazil, 2003). According to this study higher presence of sleep disorders did not correlate with antiepileptic therapy. According to Foldvary-Schaefer (2002) patients with epilepsy have problems with initialization of sleep and have worse quality of sleep.

    pdf410p ti_du_hoang 15-08-2012 32 15   Download

  • Global change, including climate change, ecosystem shifts and biodiversity loss as a result of explosive human population growth and consumption, is emerging as one of the most important issues of our time (Vitousek, 1994). Climate change in particular appears to be altering the function, structure and stability of the Earth’s ecosystems (Lovelock, 2009). It has been marked by an 80% increase in atmospheric CO2 level and a 0.

    pdf0p 123859674 04-07-2012 40 14   Download

  • Housing of course means homes. To most people this is their most treasured possession. It is not just bricks and mortar or a financial investment; it is a vital part of their life. ‘You mould the building and the building moulds you’ as Winston Churchill is said to have put it. Home is crucial to everybody’s daily well-being. As such it is normally treated with pride, and its character and contents are an extension of their per- sonality. The creation of a home is not therefore just an intellectual design exercise detached from the occupant. It should be their design.

    pdf335p tiramisu0908 25-10-2012 35 12   Download

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