Bili Buzz - Popular Science, Nature, Medicine, Archeology, Future & Myths

Organized by Interni magazine, Green Energy Design was an exhibition of experimental, multimedia installations by some of the top international design talents. The event took place on the beautiful grounds of Milan’s Università degli Studi and it was the perfect site for a relaxing sunny Sunday morning after a week marked by loads of action and just as much rain. The main installations were along the courtyard and there were plenty of “isole relax� or relaxation areas where one could sit in well-designed comfort by the likes f Martí Guixé and Patricia Urquiola with a cup of coffee and a few Interni design week publications. It was a pleasant way to take in the work, some of it quite self-explanatory, some a little more obscure. Ross Lovegrove’s Solar Tree and Toshiyuki Kita’s Sunplant were two of the most obvious energy-producing pieces, and a most apt piece of social commentary was Gaetano Pesce’s installation of a bare space with a hospital bed called Lo Spazio Malato?

The higher up in the air you go, the faster wind travels - so naturally the further from the ground a wind-turbines gets, the more efficient it can be. Thats why the idea of a flying wind-turbine is a such a win-win (or win-wind) proposition. Combining wind power with floating blimps, Selsam has been hard at work expanding the horizons of alternative energy with a revolutionary new breed of SuperTurbines that promise to take wind power to new heights.

Resembling a field of wind-swept reeds swaying on the horizon, these floating wind spires boast an ultra-efficient design that flexes with the wind, taking advantage of air currents along the length of their shaft to generate electricity. Selsam’s prototypes produce 6000 watts in 32.5 mph winds - six times more power than a similarly sized seven foot single-rotor turbine can produce. The turbines can be easily deployed by land and by sea, and their effectiveness can be amplified even further via an air-born blimp.

We’re currently at a bottleneck in the wind turbine pipeline, with GE reporting that it is unable to make turbines fast enough to meet demand. It’s no wonder, since the largest turbines have a propeller size that surpasses the wingspan of commercial airliners and require an intricately machined gearbox. This amounts to a time and resource-intensive engineering and assembly process that has production struggling to deliver on a $12 billion backlog of orders.

Selsam’s SuperTurbines offer an innovative approach to the problem with a scaled-down system of multi-rotor stalks that are extremely versatile, more efficient, and cheaper and easier to produce than than large lumbering windmills. The design relies upon economy of scale to maximize efficiency, employing multiple rotors along a lightweight, flexible shaft that allows it to shift and move with wind currents. Since the turbines rotate at higher rpms than traditional turbines, a small and light direct-drive generator can be used instead of a hulking gearbox.

Selsam’s most recent designs are optimized for sea deployment and consist of a rotor-studded shaft stemming from a floating base that is anchored to the ocean floor. The system is designed so that turbine’s base rotates similarly to the human spine, thus the turbines won’t twist and spin out of control. In an ingenious answer to stormy weather, the turbine’s base can fill with water, submerging it safely beneath the ocean’s surface.

In addition to producing energy, the multiple rotors act in unison to keep each stalk afloat; if you’re in need of a visual metaphor, Selsam’s website supplies them in spades: “Like a flock of geese, each rotor favorably affects the next in line. Like a set of louvres, the tilted rotors pull in fresh wind from above, deflecting their wakes downward to insure fresh wind for succeeding rotors and, like a stack of kites, to add overall lift which helps support the driveshaft against gravity and downwind thrust forces. The rotors act as gyroscopes or spinning tops, stabilizing the driveshaft where they are attached.�

When we recently wrote about Sunhope’s solar balloons, many people suggested that they take advantage of wind energy as well. It turns out that Selsam is one step ahead of the game with this exciting technology. Let’s just hope they find a way to negate the turbines’ ominous implication as potential bird blenders.

Via : Ecogeek.org

Rare albino tadpoles have been found in a garden pond in Wales.

The tadpoles have the distinctive pink eyes and off-white skin colouration associated with albinism.

Although isolated single examples of albino frogs, toads and newts have been seen before this is the first time a whole group has been found.

The exact location of the pond in Carmarthenshire is being kept secret while biologists carry out more research.

Jules Howard of Froglife, the UK wildlife charity which works for the conservation of amphibians and reptiles, said: “Sightings of albino frogs are rare so to find so many tadpoles together is exceptionally rare. It seems that the albino tadpoles are already changing colour and becoming darker so we are going to have to study their metamorphosis into frogs very carefully.”

About 10 clusters of spawn were laid in the pond and the albinos emerged from about four of them.

The pond’s owner, who first noticed the white-tinged tadpoles, said he did not see any albino frogs using the pond during the breeding season.

Albinos, more common in mammals, have inherited altered genes that do not produce the usual amounts of the pigment melanin.

Albinism is a ‘recessive trait’, so even if only one of the two copies passed down from male and female frogs is functional, offspring can make pigment, but will carry the albinism trait.

Both male and female amphibians must carry the defective albino gene to have offspring with albinism and in these circumstances there is a one-in-four chance of albino offspring being produced.

The rare discovery was reported to Froglife’s Wildlife Information Service, a public advice service encouraging people to get involved with amphibian and reptile conservation, last month and a careful watch has been maintained at the pond watching the tadpoles develop.

Froglife’s Wildlife Information Officer, Lucy Benyon, said: “This is certainly one of the stranger enquiries we’ve had recently.

“What’s unusual about this is that the batches of white tadpoles suggest that a number of adults that carry genes for albinism possibly exist in the area, not just one.”

“Usually though albino amphibians fail to live to a breeding age – their white colouration makes them a blindingly conspicuous beacon for the various animals that depend on frogs for food.”

Global warming is set to stall over the next 10 years as natural variations in ocean currents counteract manmade climate change.

Researchers modelling the climate of Europe and North America found that a major ocean current that brings warm water northwards is set to weaken, potentially offsetting temperature rises caused by human activity.

A team led by Noel Keenlyside at the Leibniz Institute for Marine Science in Germany focused on an ocean current known as the meridional overturning current or MOC. The current acts as a huge conveyor belt, bringing warm water into the North Atlantic and returning cold water to the south.

Scientists believe the ocean current strengthens and weakens on a natural cycle with a 70 to 80-year period. When the current is strong, it brings warmer water and a milder climate to northern regions.

The team’s models, which were checked against historical temperature changes, suggest the current will weaken enough to cool the North Atlantic, while temperatures in the tropical Pacific are unlikely to change.

The study appears in the journal Nature today.

“Our results show that global mean temperatures may plateau or cool weakly over the next 10 years because of natural fluctuations, but in the long term temperatures will continue to rise,” said Dr Keenlyside. “This doesn’t change the bottom line on global warming.”

Reports from the UN Intergovernmental Panel on Climate Change suggest carbon emissions could drive global temperatures up by as much as 0.2C each decade.

At a magnitude of 7.9, the earthquake that rocked China’s Sichuan province is now estimated to be the country’s deadliest in recent history. Fatalities have tallied over 15,000 in an industrial city that was reduced to a living situation most closely resembling a refugee camp. As national guards continue rescue efforts in rain drenched rubble, the potential for after-shocks has driven most families from their homes. Access to any type of building or upright structure still standing is prohibited by Chinese officials. Without shelter, citizens unable to evacuate the area sleep in plastic bags to keep dry.

Despite the Chinese governments efforts, the rain-drenched hillsides remain unstable and prone to landslide. International sympathy has started to come in from the United States, international relief organizations and even from the Dalai Lama who offered his prayers to the victims.