Xem 1-20 trên 69 kết quả Energy cycle
  • 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.

    pdf701p nhulan0908 29-09-2012 40 22   Download

  • Landfill gas from a source of green energy, clean, renewable and can be used to create electricity, or used in the energy industry. This paper reviews the potential energy recovery landfill gas from municipal solid waste, to reducing methane emissions in particular, and reduced greenhouse gas emissions in general. In addition, this paper provides an assessment using the model of methane generated from landfill municipal solid waste and generate energy potential of gas recovered. In particular, this paper uses a life cycle assessment methods ......

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  • Hydrogen economy represents the future of human civilization. Limited resources of our planet are compelling us to turn to renewable clean energy resources and hydrogen figures prominently as the energy carrier of a future sustainable energy system. There are significant challenges to be overcome in order to make hydrogen viable, in production, storage and power generation, while safety of operation is an ever-present factor that determines success or failure of a proposed solution.

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  • The European Physical Society (EPS) is an independent body funded by contributions from national physical societies, other bodies and individual members. It represents over 100,000 physicists and can call on expertise in all areas where physics is involved. The Position Paper consists of two parts, the EPS position, summarising the recommendations, and a scientific/technical part. The scientific/technical part is essential to the Position Paper as it contains all facts and arguments that form the basis of the EPS position. (i) The objectiv...

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  • Since the invention of synthetic zeolites in 1959, innovations in sorbent development and adsorption process cycles have made adsorption a key separations tool in the chemical, petrochemical and pharmaceutical industries. In all future energy and environmental technologies, adsorption will likely play either a key or a limiting role. Some examples are hydrogen storage and CO removal (from hydrogen, to

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  • All living organisms require food for survival, growth, and reproduction. Most broadly, the term food can be taken to include any kind of nutrient needed by animals, plants, and simpler forms of life, on down to bacteria. This would include, for example, the inorganic substances that plants draw from air and water. The processes that circulate these basic nutrients in the environment are called nutrient cycles, and the processes by which organisms make use of nutrients are collectively known as metabolism....

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  • Fuel cells (FCs) are electrochemical systems that continuously produce electric energy and heat, where the reactants (fuel and oxidant) are fed to the electrodes and the reaction products are removed from the cell. The chemical energy of the reactants is directly converted into electricity, reaction products, and heat without involving combustion processes. The efficiencies of the FCs are about twice those of the heat engines because the latter are affected by the limitations imposed by Carnot’s theorem.

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  • Life on Earth is dependent on sunlight. In the process known as photosynthesis, plants, algae and certain bacterias are capable of using this source of energy to drive the synthesis of organic compounds. The oxygenic photosynthesis results in the release of molecular oxygen and the removal of carbon dioxide from the atmosphere that is used to synthesize carbohydrates.

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  • MINERAL NUTRIENTS ARE ELEMENTS acquired primarily in the form of inorganic ions from the soil. Although mineral nutrients continually cycle through all organisms, they enter the biosphere predominantly through the root systems of plants, so in a sense plants act as the “miners” of Earth’s crust (Epstein 1999). The large surface area of roots and their ability to absorb inorganic ions at low concentrations from the soil solution make mineral absorption by plants a very effective process.

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  • IN CHAPTER 5 WE DISCUSSED plants’ requirements for mineral nutrients and light in order to grow and complete their life cycle. Because living organisms interact with one another and their environment, mineral nutrients cycle through the biosphere. These cycles involve complex interactions, and each cycle is critical in its own right. Because the amount of matter in the biosphere remains constant, energy must be supplied to keep the cycles operational. Otherwise increasing entropy dictates that the flow of matter would ultimately stop.

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  • Next, a few words about our strategy. It is well recognized now that one has to go beyond the Einstein-Hilbert action for gravity, both from the experimental viewpoint (eg.,because of Dark Energy) and from the theoretical viewpoint (eg., because of the UV incompleteness of quantized Einstein gravity, and the need of its unification with the Standard Model of Elementary Particles). In our approach, the origin of inflation is purely geometrical, ie. is closely related to space-time and gravity.

    pdf0p lulaula 25-10-2012 29 8   Download

  • The environmental goods and services  (EGS) sector has  traditionally  included solutions  for problems  such  as  air, noise  and marine pollution,  land  and water  contamination,  as well  as  activities  such  as  environmental  analysis  and  consultancy  and  waste  management  and  recycling.  However  more  recently,  the  definition  of  this  sector  has  widened.

    pdf0p dangsuynghi 15-03-2013 29 8   Download

  • Carbon  sectors  is  forecast  to  exceed  growth  in  the more  established  Environmental  sector, where  many technologies (for example in Water and Waste Treatment) are already mature.   The Renewable Energy and Emerging Low Carbon sectors currently show a much flatter growth than  previously  forecast  for  the  period  2012  to  2015.  It  is  anticipated  that  as  economic  uncertainty  is  reduced and investment funds start to flow, these growth forecasts will rise once again.

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  • Duty cycle (or duty factor) is a measure of the fraction of the time a radar is transmitting. It is important because it relates to peak and average power in the determination of total energy output.

    pdf2p hoang1 02-11-2009 54 7   Download

  • GoPower tabletop press for around US$1,000. Although the press usually comes with a 240V/50 cycle electric motor, you can buy the press with a 120V/60 cycle motor from the U.S. distributor. The press looks like a powerful juicer. To operate it, pour the oilseed into the funnel and wait for the vegetable oil to pour out of the bottom. The meal oozes out of the side of the press. The Three Ways to Use Vegetable Oil as a Fuel Diesel engines that are found in cars, trucks, generators, boats, buses, trains, planes, pumping stations, tractors, and agricultural equipment can all...

    pdf5p hungnhat 08-12-2009 40 6   Download

  • In this volume, recent contributions on coherence provide a useful perspective on the diversity of various coherent sources of emission and coherent related phenomena of current interest. These papers provide a preamble for a larger collection of contributions on ultrashort pulse laser generation and ultrashort pulse laser phenomena. Papers on ultrashort pulse phenomena include works on few cycle pulses, high-power generation, propagation in various media, and a variety of applications of current interest....

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  • Projects always involve a finite amount of uncertainty (risk) that may lead to problems and surprises during the project. Dealing with surprises requires more time, energy, and money than originally planned. Risk management can help reduce the likelihood and affects of risks. Risk management is important as it helps the team accomplish the project with as little trouble as possible. As a professional scientist, engineer, or project manager, you will be required to help get the job done. Excuses (whether real or imaginary) generally don't buy any sympathy.

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  • There is a clear opportunity to improve new car fuel economy 30% by 2020 and 50% by 2030, in a cost-effective manner (e.g. low or negative cost per tonne of CO2). Improving the efficiency of new cars at this rate would make possible a 50% im- provement in the average fuel economy of all cars on the road worldwide by 2050.

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  • This paper is devoted to the development of a new lead acid battery electrolyte formulation for cycling applications, especially for renewable energy markets in developing countries. These emerging markets, such as solar home systems, require lead acid batteries at very low prices and improved performances compared to automotive batteries produced locally. The new acid formulation developed is a mixture of sulphuric acid, liquid colloidal silica and other additives including phosphoric acid.

    pdf7p congdat261 19-11-2010 49 4   Download

  • During the last twenty years since the first commercialization of lithium ion batteries (LIBs), there has been ever continuing improvements in their performance, such as specific charge/ discharge capacity, cycle stability, and safety, according to the practical demands from various end-uses.

    pdf0p 123859674 04-07-2012 29 4   Download

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