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Enerzine, le portail de toutes les énergies - pétrole - gaz - électricité - nucléaire - solaire - éolien - biocarburants - éolien - bois - vagues

Enerzine, le portail de toutes les énergies - pétrole - gaz - électricité - nucléaire - solaire - éolien - biocarburants - éolien - bois - vagues

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A Plan to Power 100 Percent of the Planet with Renewables In December leaders from around the world will meet in Copenhagen to try to agree on cutting back greenhouse gas emissions for decades to come. The most effective step to implement that goal would be a massive shift away from fossil fuels to clean, renewable energy sources. If leaders can have confidence that such a transformation is possible, they might commit to an historic agreement. We think they can. Print We are facing drastic measures if we are to be able to achieve the energy and climate objectives we have set for ourselves. And we need models so that we can, in a holistic perspective, analyse the effects of the large scale changes in the energy system that are expected. The general aim of our research project “Bioenergy, climate and economy” is to contribute to the development of the types of model that can be used as a reference in designing energy and climate policies.

Journal home : Nature Raphael Lis, Charles C. Karrasch, Michael G. Poulos, Balvir Kunar, David Redmond, Jose G. Velomobile A velomobile, or bicycle car, is a human-powered vehicle (HPV) enclosed for aerodynamic advantage and protection from weather and collisions.[1] Nearly all velomobiles are single-passenger vehicles. They are derived from recumbent bicycles and tricycles, with the addition of a full fairing (aerodynamic shell). Velomobiles generally have three or four wheels, and are therefore not bicycles (which means two wheels); two-wheeled faired bicycles are better known as streamliners. Swissgrid - frequency The standard frequency in Europe’s electricity grid is 50 Hz. In North America and parts of Japan, on the other hand, a standard frequency of 60 Hz is used. These frequencies must be kept as stable as possible for various reasons: Time measurement: there are still many clocks which go by the frequency in the electricity grid. If the frequency is higher, they go faster. If the frequency is lower, they go more slowly.Machines: large electrical machines can suffer damage if the frequency is too low or too high, or if it changes rapidly.

IPCC SRREN: Full Report — SRREN Full Report (PDF, 45 MB) Please use the following reference to the whole report: IPCC, 2011: IPCC Special Report on Renewable Energy Sources and Climate Change Mitigation. Prepared by Working Group III of the Intergovernmental Panel on Climate Change [O. Edenhofer, R. Summer School Utilization of Biomass for the Production of Chemicals or Fuels “The concept of Biorefinery comes into operation” Spider Silk Is Strong Because It's Smart Spider silk is well known for some spectacular properties. It is stronger than steel and tougher than Kevlar yet flexible enough to be spun into a wide variety of shapes. New research shows that the material is not only strong but also smart. “Spider silk has a particular way of softening and then being stiff that is really essential for it to function properly,” said engineer Markus J. Buehler of the Massachusetts Institute of Technology, who co-authored the new study, which appears in Nature Feb. 2. A spider web provides its occupant with a home and a way to catch prey.

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