terça-feira, 21 de agosto de 2012

Lua de Saturno pode ser capaz de criar moléculas que geram DNA


Arthur C. Clarke errou o planeta...

Uma das teorias que os cientistas disseminam é a de que a vida pode começar de diferentes maneiras e em diferentes condições. Um fator que vem para reforçar essa hipótese é o está acontecendo na Titã, uma das luas de Saturno.

Nesse satélite, estão presentes todos os fatores que viabilizam o começo da vida sem água, como a presença de luz ultravioleta e nitrogênio — o principal componente dessa “receita” é uma grande névoa laranja de hidrocarboneto. Além disso, foram encontradas moléculas na atmosfera dessa lua, mas elas continuam sem identificação, pois a sonda que as encontrou não tem recursos para a análise.

Dessa maneira, a criação de DNA — que é um dos requisitos essenciais para vida — pode ser viabilizada, originando outros tipos de seres. Isso não acontece de uma hora para a outra e não é um fato concreto, mas há chances remotas de que aconteça.

Com isso, os cientistas podem começar a entender melhor como a atmosfera planetária foi influente na formação de vida na Terra, orientando melhor o estudo em outros planetas.

Fonte: CSMonitor

sexta-feira, 17 de agosto de 2012

Venger Wind Unveils World's Largest Rooftop Wind Farm in Oklahoma City

Venger Wind and US renewable distributor SWG Energy just installed the world’s largest rooftop wind farm atop the Oklahoma Medical Research Foundation (OMRF) in Oklahoma City. The project saw Venger Wind construct 18 V2 vertical axis wind turbines on the medical center’s roof as part of OMRF’s sustainability strategy to create a zero emissions research tower.
The omni-directional wind turbines have been integrated into the design of the building and precisely positioned to collect wind from both the North and South sides of the rooftop farm. The installation of the 18 wind turbines makes the entire project the largest building integrated wind energy system in the U.S.
Unlike most vertical wind turbines, which are relatively modest in size, the V2 wind turbines are massive. They stand 18.5 feet tall and are rated at 4.5 kilowatts each. Unlike conventional wind turbines that use energy from the grid to start, the vertical turbines start producing electricity at 8.9 mph, which is well below Oklahoma City’s annual wind speed average.
Venger Wind is a global clean technology company engaged in the design, manufacturing and marketing of small wind turbines developed to generate clean electricity. Their V2 turbines are based on the work of Finnish engineer Sigurd Johannes Savonius who first invented the Savonius wind turbine in 1922.
Speaking about the project, Ken Morgan, Venger Wind’s Chairman and CMO said; “This project took a lot of hard work and long hours from all involved. This is a groundbreaking success for Venger Wind and the small wind industry worldwide. The potential to provide wind energy at the point of use, within urban environments is a major paradigm shift from the typical large wind scenarios where multi megawatt systems are forced to be installed farther and farther away from populations where the energy is needed most.”
“The small wind industry still has a long way to go in educating ourselves and our customers on properly assessing and installing wind turbines on buildings. It truly is a whole new science that has emerged and we are very excited with the Architects and Engineers we currently work with whom are pioneering new concepts for wind turbine integration into buildings. The OMRF building is an exemplary example of what is possible.”
Click here to view a video of the installation of the turbines.