Xem 1-20 trên 260 kết quả Energy changes
  • As populations increase and countries industrialize, the world’s demand for energy increases. Our supply of petroleum and gas is limited, but the photovoltaic cell offers a solution to the problem of a future energy shortage. This cell is already an important source of energy. In fact, it seems almost like magic. The photovoltaic cell changes sunlight directly into energy. Solar energy – energy from the sun – is clean, easily available, inexhaustible, and free, if the equipment is available....

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  • Evidence grows daily of the rapid changes in climate due to human activities and their impact on plants and animals. Plant function is inextricably linked to climate and atmospheric carbon dioxide concentration. On the shortest and smallest scales the climate affects the plant’s immediate environment and thus directly influences physiological processes. On longer and larger time and space scales climate influ- ences species distribution and community composition and determines what crops can be viably produced in managed agricultural, horticultural and forestry ecosys- tems.

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  • Overall structure of electrical power system is in the process of changing. For incremental growth, it is moving away from fossil fuels - major source of energy in the world today - to renewable energy resources that are more environmentally friendly and sustainable [1].

    pdf328p phoebe75 19-02-2013 64 23   Download

  • The world faces serious difficulties in obtaining the energy that will be needed in coming decades for a growing population, especially given the problem of climate change caused by fossil fuel use. This book presents a view of nuclear energy as an important carbon-free energy option. It discusses the nuclear fuel cycle, the types of reactors used today and proposed for the future, nuclear waste disposal, reactor accidents and reactor safety, nuclear weapon proliferation, and the cost of electric power.

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  • A look on energy, renewable energies, energy storage and synthetic fuels, hybrid architecture, fuel cells, hydrogen as a vector of energy of the future.The Earth resources are quite limited in quantity Many challenges to mankind in 21st century: development, health, water, food, demography, education, energy.In physics, energy (Ancient Greek: ἐνέργεια energeia "activity, operation"[1]) is a quantity that is often understood as the ability a physical system has to produce changes on another physical system.

    pdf156p dienquochuy 21-12-2012 42 19   Download

  • Energy management and conservation are the keys to using fuel and electrical energy in the most efficient way. Proper energy management can lead to big savings on the operating costs of a building. If fuel and electrical energy consumption are reduced, money will be saved as a result. Many residential, industrial, and commercial buildings have already undergone changes that have resulted in the savings of both energy and money. Any building can be made more energy efficient when proper energy management procedures are applied....

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  • 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.

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  • ETP2010 will build on the success of earlier editions, by providing decision makers with more detailed practical information and tools that can help kick-start the transition to a more secure, sustainable and affordable energy future.

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  • Overall structure of electrical power system isin the process of changing. For incremental growth, it is moving away from fossil fuels - major source of energy in the world today - to renewable energy resources that are more environmentally friendly and sustainable [1].

    pdf327p namde01 11-04-2013 48 13   Download

  • The heat transfer and analysis on laser beam, evaporator coils, shell-and-tube condenser, two phase flow, nanofluids, and on phase change are significant issues in a design of wide range of industrial processes and devices. This book introduces advanced processes and modeling of heat transfer, flat miniature heat pipe, gas-solid fluidization bed, solidification phenomena, thermal approaches to laser damage, and temperature and velocity distribution to the international community.

    pdf398p ktcn_1 10-07-2012 43 10   Download

  • In this user-friendly and informative book, prolific author and academic Vaclav Smil provides an introduction to this far-reaching term and gives the reader a greater understanding of energy's place in both past and present society. Starting with an explanation of the concept, he goes on to cover such exciting topics as the inner workings of the human body, and the race for more efficient and environmentally friendly fuels.

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  • Traditional electrical power systems were essentially based on centralized and fuel consuming power generation plants, where end-users were supplied via unidirectional transmission and distribution grids.

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  • Tham khảo sách 'two phase flow, phase change and numerical modeling_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Addressing the sustainable energy crisis in an objective manner, this enlightening book analyzes the relevant numbers and organizes a plan for change on both a personal level and an international scale—for Europe, the United States, and the world. In case study format, this informative reference answers questions surrounding

    pdf383p mymi0809 23-01-2013 26 6   Download

  • The main objective of this work is to develop an economically viable process for producing papermaking fibres of adequate quality and generating energy from wheat straw. Wheat straw was selected as the raw material since wheat is cultivated and available worldwide (Curtis 2002) and only a minor part of the straw is used for energy production or animal feed. One of the primary aims in this work is to find ways to store the raw material chemically between the harvesting periods and examine the effects on pulping and pulp properties (Paper IV). In addition, the aim of this work is...

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  • Energy and climate change are issues of critical importance for shaping a sustainable future, both in South Africa and globally. For South Africa, finding a policy approach which balances the increasing demand for energy with the need for sustainability, equity and climate change mitigation is a particular challenge. This book provides an innovative and strategic approach to climate policy, with local development objectives as its starting point.

    pdf0p quatet 12-01-2013 31 3   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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  • Civilization is on a non-renewable energy course upon which we are dependent and which can only be maintained by increasing use of fossil fuel oil and gas and coal, with the result of rising greenhouse gas levels and increasing climate change that leads to increasing ecosystem destruction. It is imperative that civilization bring about an energy transition to a renewable energy economy, which may be based on inexhaustible solar energy, hydrogen, and electricity derived from renewable sources.

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  • This book contains a set of papers presented during the world’s second online climate change conference (Climate 2009) held on 2–6 Nov 2009. The idea of running on-line climate conferences was born in Hamburg in the summer of 2008. With the first on-line climate change conference (titled “Climate 2008”) and the second one titled “Climate 2009” groundbreaking a methodology was established: the execution of climate change conferences which are not – paradoxically – harmful to the climate as conventional conferences are, but ones which are climate-neutral....

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  • The security environment in the Middle East has become increasingly complicated during the past decade. This report identifies several important trends that are shaping regional security and identifies their implications for the United States. Many traditional security concerns, such as energy security and the proliferation of weapons

    pdf0p xuancoem 05-02-2013 7 1   Download

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