A concept to turn the Eiffel Tower into a giant green wall has been proposed as a symbolic statement of "the reconciliation of nature and best prices for levitra mankind."The plan calls for 600,000 plants to be attached to the structure using hemp sacks filled with soil as the growth media. An irrigation system comprising 12 tons of tubing would be used to provide water for the plants.
The installation would not be permanent, and would be removed after a few years. But, once in place, the installation would help remove an estimated 87.8 tons of CO2 from the vizuka.com atmosphere.
"Should it not be the duty of engineers to imagine a new future where nature is brought back into the heart of tramadol cod saturday the city," said a statement from Ginger, the company behind the proposal. With an estimated cost of nearly 100 million dollars for the project, that's more than a million dollars per ton of CO2. Hardly the most cost effective carbon sequestration, but certainly a visible one.
A new optical furnace that uses intense light rather than a conventional furnace to heat the silicon to make solar cells saves about half the cialis pfizer 50 mg energy needed. The process uses a furnace with "highly reflective and heat-resistant ceramics to levitra best buy ensure that the light is cialis generic canada absorbed only by a silicon wafer, not by the walls inside the furnace." The process was developed by scientists at the National Renewable Energy Laboratory (NREL).
In addition to providing improved efficiency in the production of the cells, the optical furnace also does a better job at removing some impurities, which makes for better output from the finished panels. Eventually, researchers on the project believe that this could provide a four percentage point increase in the efficiency of the solar cells produced with this method.
Photovoltaic technology has taken another step forward as researchers at the National Renewable Energy Laboratory (NREL) have demonstrated a photocell with an external quantum efficiency over 100 percent using quantum dots. The new cell uses a process called Multiple Exciton Generation (MEG) that produces more than one electron-hole pair per absorbed photon, and reached a level of 114 percent.
This development offers the where can i purchase cialis possibility of increased efficiency in solar panels, and the technology is able to be manufactured using high-throughput roll-to-roll manufacturing. With the use of levitra delivered overnight quantum dots, photocells could theoretically see as much as a 35 percent increase in power conversion efficiency above contemporary cells. The research cell was constructed as a "layered cell consisting of antireflection-coated glass with a thin layer of a transparent conductor, a nanostructured zinc oxide layer, a quantum dot layer of lead selenide treated with ethanedithol and hydrazine, and a thin layer of gold for the top electrode."
Note that this does not mean that the entire panel would have a total efficiency above 100% (which would be thermodynamically impossible). The quantum efficiency means only that the number of electron-hole pairs created in the cell is greater than the number of photons that are absorbed. Nonetheless, the advance provided by MEG could lead to the next generation of even more efficient solar energy collectors.
The City of Austin, Texas may enact one of the toughest bag bans in the country come 2016. The city council is set to vote on the ban next month that would require retailers to only offer reusable bags.
The ban would include a three-year adjustment period starting in 2013 for retailers and consumers to get prepared where single-use bags could still be purchased at 25 cents each. Once 2016 hits though, only reusable bags would be allowed and that would include City of Austin facilities and only here usa levitra all city events.
Some single-use bags would be exempt from the ban, including: restaurant carryout bags, bags for wine and beer, dry cleaning bags, newspaper delivery bags and bags that hold meat, fish, produce, bulk foods or pharmaceuticals.
Reusable bags would be defined as bags that are made of zvezdegranda.rs fabric or durable materials or thick paper or plastic with some recycled content. The city would pay for an aggressive marketing campaign to canadian pharmacy ed get the word out about the ban with proceeds from the 25 cent fee.
A team of engineers at the University of Illinois have figured out how to create self-healing circuits in electronics and batteries, a discovery that could lead to longer equipment life and make a nice dent in the piles of e-waste plaguing the planet.
As electronics have become more complex, one small circuit failure can render a device useless, especially since it is hard or often impossible to diagnose where that failure occurred to fix it. Nancy Sottos, an engineer working on the project said:
The solution her team came up with was an army of microcapsules about 10 microns in diameter dispersed along a circuit. When a crack occurs in the circuit, the microcapsules break open and release a liquid metal that fills in the crack and levitra tadalafil restores the electrical flow. The time between a failure and the microcapsules filling the crack is www.pjr.com only a few microseconds.
In tests, 90 percent of the samples were healed to 99 percent of their original conductivity. It also require zero human intervention. Only the microcapsules intercepted by a crack opened while the others remained intact.
The engineers see this breakthrough as especially useful for air and spacecraft where miles of daily cialis conductive wire would have to be gone through to diagnose a failure. The team, which originally used microcapsules to create self-healing polymers, want to see what other applications they may have.
Now, in time to make us feel all warm and fuzzy during the holiday season, the tech giant has announced that they're investing $94 million in a group of four solar projects by Recurrent Energy. This latest investment brings the how can i buy cialis in canada total of the company's renewable energy investments to www.ncitech.co.uk almost $1 billion.
The four solar photovoltaic projects will have a combined capacity of 88 MW and will be located near Sacramento, California. The projects will provide enough power for 13,000 homes. A power purchase agreement has already been signed by the Sacramento Municipal Utility District for 20 years.
In 2011, Germany finally saw their renewable energy production top that of almost all other sources of energy, including nuclear, hard-coal and cheapest viagra anywhere gas-fired power plants. The only other energy generation source greater than the renewable energy mix was lignite-fired power.
According to a report from German utility BDEW, renewable energy accounted for 20 percent of the country's total energy output, up from 16.4 percent last year. Lignite-fired output produced 24.6 percent of the electricity.
Nuclear power is dropping off in the country since Chancellor Merkel closed the eight oldest reactors this past year after the Fukushima catastrophe. Nuclear represented 17.4 percent of the country's electricity load, down from 22.4 percent last year and the country plans to step away from the energy source completely by 2022.
A Congressional spending deal made late last night includes a provision that prevents the Department of Energy from enforcing the incandescent light bulb ban set to go in effect in January for another nine months.
The first phase of how to get cialis no prescriptionthe ban, which still remains on the books but just can't be enforced, includes higher efficiency standards for 100-watt bulbs. By the end 2014, all incandescents will be phased out. According to the National Electrical Manufacturers Association, many American light bulb makers had already started investing money on only today usa levitra making the change from incandescents to more efficient bulbs like halogen, CFLs and LEDs and this delay may now cause them to lose money to foreign competitors still selling the cheaper bulbs.
The delay in enforcement will end on September 30, 2012 at the end of the government's fiscal year when hopefully the levitra discount legislation will be able to go into effect.
Bamboo is considered a green building material, but it is most often found as an adjunct within larger construction using other materials. Recently, however, an entire chocolate factory has been built in Indonesia as the world's largest commercial bamboo structure. The 26,500 square foot (2,460 square meter) facility handles the entire range of operations, from initial processing the beans to viagra 100mg final production of chocolate, what they call "beans to bars."
The Big Tree Farms factory, located in Sibang, Bali, not only has the exterior built from bamboo, but bamboo was also used for interior walls, which were made from woven bamboo strips, and stairs which used bamboo plywood for treads. The bamboo was treated with borax for fire-prevention and boric acid to resist insects, and a food-grade coating was applied to interior walls.
What makes bamboo an especially green building material is that it is fast-growing, making it a rapidly renewable resource that doesn't devastate the landscape when it is harvested. Bamboo is strong enough to compare with mild steel in some applications. It is regularly used for construction scaffolding throughout southeast Asia.
Wood is a versatile construction material. It has been used for thousands of years. It has low embodied energy compared to many other building materials, and it serves to sequester carbon. But, compared with steel, it is relatively weak, and that, combined with its inherent combustability, has meant that wood is not used for structures more than a few stories tall. Now, a new development in wood construction called cross-laminated timber (CLT) is making new possibilities available in wood construction.
Cross-laminated timber panels are like massive plywood boards. Instead of shaving a log into a veneer and then gluing it together to make a board a few eighths of an inch thick, a CLT panel is made from pieces of sawn wood and is several inches thick. Like plywood, alternating layers are laid perpendicular to cialis transdermal one another, so that the finished panel is stronger and more dimensionally stable than plain wood would be.
Because the panels are many inches thick, there is an inherent fire resistance to the material, which, in the event of http://www.beverly.org/best-price-levitra-online a fire, will char on the outside but will not burn through quickly. Construction with CLT is also faster and requires fewer workers and viagra soft lighter equipment, which can make construction more affordable.
The Stadhaus is a 9-story residential building in London which was built using CLT and is the tallest modern building constructed with wood. At present, CLT is primarily a European development, but fabrication plants are under construction in the US, and CLT panels should start to be available within a couple of years.
When we think of all the www.pjr.combusinesses and institutions that we'd like to see embrace renewable energy, prisons don't immediately pop to mind, but huge correctional facilities require a lot of electricity to run and the large flat spaces they most often occupy make them perfect for solar power.
Most recently, two Illinois correctional facilities in Merced County have announced that they'll be running on solar power. Two arrays consisting of 6,272 solar panels located on land adjacent to www.asian-americans.com the two facilities have a capacity of 1.4 MW and will be able to provide 70 percent of the facilities' peak electricity consumption and all of the power during off-peak times.
The arrays plus new energy-efficient lighting systems being installed will reduce CO2 emissions by 999.85 tons. The cost savings will be substantial too. The county expects to save $300,000 a year on energy costs creating a positive cash flow that could total $9 million in 25 years.
Four California correctional facilities announced in October that they'd be installing solar arrays as well. All put together the four arrays will have a capacity of 25 MW and save taxpayers $57 million over 20 years.