Libro de Visitas

Charlestably

04 Sep 2024 - 08:31 pm

‘Dyson spheres’ were theorized as a way to detect alien life. Scientists say they’ve found potential evidence
2krn.nl

What would be the ultimate solution to the energy problems of an advanced civilization? Renowned British American physicist Freeman Dyson theorized it would be a shell made up of mirrors or solar panels that completely surrounds a star — harnessing all the energy it produces.

“One should expect that, within a few thousand years of its entering the stage of industrial development, any intelligent species should be found occupying an artificial biosphere which completely surrounds its parent star,” wrote Dyson in a 1960 paper in which he first explained the concept.
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If it sounds like science fiction, that’s because it is: Dyson took the idea from Olaf Stapledon’s 1937 novel “Star Maker,” and he was always open about that. The late scientist was a professor emeritus at the Institute of Advanced Study in Princeton, New Jersey.
Still, coming from a thinker who some in the scientific community say might have been worthy of a Nobel Prize early in his career, the concept took hold and the hypothetical megastructures became known as Dyson spheres, even though the physicist later clarified that they would actually consist of “a loose collection or swarm of objects traveling on independent orbits around the star.”

In his paper, Dyson also noted that Dyson spheres would give off waste heat detectable as infrared radiation, and suggested that looking for that byproduct would be a viable method for searching for extraterrestrial life. However, he added that infrared radiation by itself would not necessarily mean extraterrestrial intelligence, and that one of the strongest reasons for searching for such sources was that new types of natural astronomical objects might be discovered.

“Scientists (at the time) were largely receptive, not to the likelihood that alien civilisations would be found to exist, but that a search for waste heat would be a good place to look,” said George Dyson, a technology writer and author and the second of Dyson’s six children, via email. “Science fiction, from ‘Footfall’ to ‘Star Trek,’ took the idea and ran with it, while social critics adopted the Dyson sphere as a vehicle for questioning the wisdom of unlimited technological growth.”

Keithdyews

04 Sep 2024 - 03:49 pm

The ghost town that has stood empty for more than a century
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There’s a large and very dignified school in Kayakoy. There are narrow streets, lined with houses, that wend and rise up both sides of a steep valley. There’s an ancient fountain in the middle of the town. And there are churches, one with million-dollar hilltop views over the blue Aegean.

But, for most of the past 100 years, there have been no people.

Kayakoy, in southwestern Turkey’s Mugla Province, is a true ghost town. Abandoned by its occupants and haunted by the past. It’s a monument, frozen in time – a physical reminder of darker times in Turkey.

With hillsides dotted by countless crumbling buildings slowly being swallowed by greenery, and endless views into vanished lives, it’s also a fascinating and starkly beautiful place to visit. In summer, under clear skies and blazing suns, it’s eerie enough. Even more so in cooler seasons, wreathed in mountain or sea mists.
Just over a century ago, Kayakoy, or Levissi as it was known, was a bustling town of at least 10,000 Greek Orthodox Christians, many of whom were craftspeople who lived peacefully alongside the region’s Muslim Turkish farmers. But in the upheaval surrounding Turkey’s emergence as an independent republic, their simple lives were torn apart.

Tensions with neighboring Greece after the Greco-Turk war ended in 1922 led to both countries ejecting people with ties to the other. For Kayakoy, that meant a forced population exchange with Muslim Turks living in Kavala, in what is now the Greek region of Macedonia and Thrace.

But the newly arrived Muslims were reputedly less than happy with their new home, swiftly moving on and leaving Kayakoy to fall to ruin.

Loganmaw

04 Sep 2024 - 01:00 pm

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Jasonsoorm

04 Sep 2024 - 09:51 am

This city is developing the world’s tallest timber tower, again
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The US city of Milwaukee is already home to the world’s tallest timber tower. But another, even taller, wooden skyscraper could be added to its skyline, designed by Vancouver-based studio Michael Green Architects (MGA).

The firm recently released plans for the development, which includes a 55-story tower made principally from mass timber — thick, compressed, multilayered panels of solid wood. If built, it would usurp the current world title holder, the 25-story Ascent tower by Korb + Associates Architects, as well as becoming the tallest building in the state of Wisconsin.

MGA, which specializes in wooden architecture, hopes that the project will set a “new global benchmark for mass timber construction.”

The project is part of the redevelopment of the Marcus Performing Arts Center, which opened in 1969 and won the Honor Award for Excellence in Architectural Design from the American Institute of Architects in 1970. Led by Neutral, which bills itself as a “regenerative development company,” the redesign will transform what is currently the center’s concrete parking lot into a space with residential units, offices, restaurants, cafes, grocery stores and public plazas. According to MGA, construction will cost an estimated $700 million. The plan is currently going through the city’s approval process, during which it is expected to evolve.

Why timber?
While the use of mass timber is steadily increasing worldwide, thanks to changes in building regulations and shifting attitudes towards the material, it has yet to match the sheer height of buildings made of concrete and steel — although a slew of timber high-rises have been proposed in recent years. MGA says its tower design would be approximately 600 feet (182 meters) tall — more than double the 284 feet (87 meter) tall Ascent tower.

“The race for height is important,” said Michael Green, an architect and founder of MGA. “It’s not about showing off, it’s about showing what’s possible to the public.”

He argued that the reason timber skyscrapers haven’t yet become mainstream is because climate change hasn’t been at the center of the conversation. “We didn’t really need to challenge the status quo of steel and concrete,” he said. “But because those materials are so hard on the climate, we had to find a different way to build towers and big buildings in general.”

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04 Sep 2024 - 09:19 am

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04 Sep 2024 - 08:29 am

Как научить ребенка справляться с неудачами
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Источник:Как научить ребенка планировать и достигать цели
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