Skip to main content

Home/ Groups/ qmstech2
Rss Feed
Sort By: Most Recent | Popular Filter: All | Bookmarks | Topics Simple Middle
2More

Explainer: what are biofuels? | Biofuels | SBS World News - 0 views

www.sbs.com.au/...Explainer-what-are-biofuels biofuel form
shared by dpurdy on 06 Apr 13 - No Cached
  • The biofuel industry takes the chemical energy contained in organic materials and converts this into useful energy sources. However, it is not necessarily a sustainable industry. Daniel Tan explains.
  • dpurdy on 06 Apr 13
     
    Explanation of the form of bio fuels.
1More

Climate: Facts, dangers and what you can do | Environmental Defense Fund - 0 views

www.edf.org/...ts-dangers-and-what-you-can-do climate
shared by olearydev99 on 26 Mar 13 - No Cached
  • olearydev99 on 26 Mar 13
     
    "Scientists track changes to the planet's temperature in many ways. Land-based weather stations and ocean buoys in every corner of the world monitor temperatures constantly."
2More

How does an electrical generator work? - 0 views

www.sommersgen.com/...about-generators.php convert
shared by dpurdy on 25 Mar 13 - No Cached
  • Electric generators are essentially coils of electric conductors, usually copper wire, that are tightly wound onto a metal core and are mounted to spin around inside an array of large magnets
  • the copper conductor can spin at very high speeds through the magnetic field, producing a powerful flow of electricity. The same principle applies whether the generator is driven by a bicycle wheel, a tractor engine or a steam turbine.
1More

Why a hydrogen economy doesn't make sense - 0 views

phys.org/news85074285.html fuel cell form
shared by dpurdy on 24 Mar 13 - No Cached
  • dpurdy on 24 Mar 13
     
    How inefficient it is to make hydrogen from electricity
2More

How Wind Works | Wind Energy Foundation - 0 views

www.windenergyfoundation.org/...how-wind-works wind form
shared by dpurdy on 24 Mar 13 - No Cached
  • Wind is simply air in motion. It is caused by the uneven heating of the Earth's surface by the sun. Because the Earth's surface is made of very different types of land and water, it absorbs the sun's heat at different rates. One example of this uneven heating can be found in the daily wind cycle.
  • Mechanical or electrical power is created through the kinetic energy of the wind.
2More

Nuclear Industry Withers in U.S. as Wind Pummels Prices - Bloomberg - 0 views

www.bloomberg.com/...ind-pummels-prices-energy.html wind cost
shared by dpurdy on 24 Mar 13 - No Cached
  • The wind power boom has benefited consumers in regions where wind development is fastest, contributing to a 40 percent wholesale power-price plunge since 2008
  • U.S. wind installations have risen 10-fold since 2003 to 60,007 megawatts,
1More

NASA - Ask an Expert: All About the Sun! - 0 views

www.nasa.gov/...solar_chat2.html solar sustainable
shared by dpurdy on 06 Apr 13 - No Cached
  • How many years is left before the sun dies? David: About 4.5 billion years, give or take a billion. :)
3More

How much CO2 does one solar panel create? | MNN - Mother Nature Network - 2 views

www.mnn.com/...o2-does-one-solar-panel-create solar co2 fossil fuels
shared by dpurdy on 06 Apr 13 - Cached
  • solar panels are at least 20x better on the climate than coal, kWh for kWh.
  • Based on that study, solar PV works out to about 50g of CO2 per kWh compared to coal's 975g of CO2 per kWh, or about 20x "cleaner."
  • dpurdy on 06 Apr 13
     
    Comparison of CO2 from photovoltaics and coal. 
1More

Coal Burning, Fossil Fuels, Pollution - National Geographic - 0 views

environment.nationalgeographic.com/...high-cost-coal pollution fossil fuels
shared by dpurdy on 17 Sep 13 - No Cached
  • dpurdy on 17 Sep 13
     
    We have more coal than other countries.
1More

The hidden costs of fossil fuels - and biofuels, too - CSMonitor.com - 1 views

www.csmonitor.com/...-fossil-fuels-and-biofuels-too fossil fuels pollution cost biofuel
shared by dpurdy on 06 Apr 13 - No Cached
  • Climate considerations aside, damages wrought by ethanol made from corn were usually similar to, or even slightly worse, than damages from gasoline. That’s because of the extra energy needed to convert corn to biofuel.
3More

Tidal Power - Costs - Pros & Cons - How it Works - Green Energy - 0 views

clean-future.com/...tidal-power tide form convert
shared by dpurdy on 06 Apr 13 - No Cached
  • Tidal power is a predictable source of energy unlike that of wind power and solar power because the tides follow the gravitational pull of the moon. The general production of tidal energy is similar to other forms of hydroelectric power where the force of water flow spins a turbine which generates energy.
  • he tidal stream generator uses the kinetic energy of the flowing tide to spin windmill like turbines. It is also often referred to as a tidal energy converter (TEC).
  • Tidal power is the production of electricity by the utilization of tidal energy.
6More

Ocean Wave Energy Power Technology - History - 0 views

clean-future.com/...wave-power
shared by westkea00 on 06 Apr 13 - No Cached
  • Currently, numerous wave power plants (so called wave farms) have been implemented throughout the world. Many different organizations have designed various wave power systems that differ in size, cost, and effectiveness. A wave farm is a collection of wave power systems in order to create mass quantities of power. One example of a wave power plant is the Aguçadoura Wave Farm in Portugal from Pelamis Wave Power Ltd. It is the first wave farm ever established and produces 2.25 megawatts of power. It was completed in 2008. Other wave farms, with other companies involved, have been proposed.
  • Wave energy is about using the energy of ocean waves for producing electrical current. It is a renewable energy resource and often confused with Tidal Power.
  • Wave energy is considered a form of hydropower, although it is the wind blowing over the surface of the ocean causing waves. So in many ways, wave energy is also wind energy - with all the pros and cons.
  • ...3 more annotations...
  • In contrast to tidal power, ocean wave energy plants do not make use of the energy difference between high tide and low tide, but generating energy from continuous wave motion. So, wave energy generation is the conversion of the forces from the motion of waves into usable energy.
  • Wave power generation has been tested over the past century as an alternative energy source to fossil fuels to create electrical power, sea water desalinization, and reservoir pumping. Unfortunately, despite of all examinations and tests, the price for generating energy from ocean waves is still about twice as high as that of wind energy. Companies involved in wave energy generation hope to be able to cut 50% of the costs within the next couple of years.
  • During the 1970's gasoline crisis, wave power was pushed in order to be a good long term energy solution. Later, the energy crisis was resolved yet the leaps and bounds made in the innovation of wave power remained. Though there were not many wave power plants actually implemented, it has proven to be a benefit to modern resolutions with current power crises. Fuel prices are rising exponentially and the greenhouse effect is having potentially disastrous effects on the environment. There has never been more need for alternatives to fossil generated energy.
« First ‹ Previous 481 - 500 Next › Last »
Showing 20▼ items per page