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Al doilea defect al cablului marchează sfârșitul faimosului radiotelescop Arecibo PDF Imprimare
International
Marţi, 24 Noiembrie 2020 13:00

The Arecibo radio telescope after the second cable failure in November 2020

The Arecibo radio telescope after the second cable failure in November 2020

The Arecibo Observatory's famous 1,000-ft (305-m) radio telescope is to be demolished after a second support cable failed. An assessment by the engineering firm of Thornton Tomasetti has determined that the radio dish and its 900-ton instrument platform are too unstable to be safely repaired.

Once the largest single-dish radio telescope in the world, the Arecibo radio telescope has been in service for 57 years. It's funded by the US National Science Foundation (NSF) and operated by the University of Central Florida for astronomy, planetary, solar system, and geospace research, as well as gathering data for the SETI project to seek out extraterrestrial civilizations. In addition, it was a filming location for the science fiction film Contact and the James Bond thriller Goldeneye.

 

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Rezultatele alegerilor din SUA, în 2020 PDF Imprimare
International
Sâmbătă, 07 Noiembrie 2020 19:04

Biden wins White House, vowing new direction for divided US

By JONATHAN LEMIRE and ZEKE MILLER

WASHINGTON (AP) — Democrat Joe Biden defeated President Donald Trump to become the 46th president of the United States on Saturday, positioning himself to lead a nation gripped by the historic...

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Un aisberg uriaș ar putea fi în curs de coliziune cu insula Georgia de Sud PDF Imprimare
International
Vineri, 06 Noiembrie 2020 13:23

Satellite image of A68a, which resembles a pointed finger, as it heads towards South Georgia

" Satellite images indicate that an iceberg 158 km (98 mi) long and 48 km (30 mi) wide is floating towards the island of South Georgia in the southern Atlantic, where it could cause damage to the local wildlife, including penguins and seals, if it runs aground.

  In 2017, a gigantic sheet of ice covering 6,000 km² (2,300 mi²) broke free from the Larsen C ice shelf in Antarctica and drifted out to sea. Originally designated A-68, it later calved off three smaller bergs, after which it was renamed A-68a. This event sparked considerable scientific interest, especially after freeing up a seabed that's been encased in ice for 120,000 years. And now it looks as if the iceberg could have unpleasant consequences as the winds and tides send it toward South Georgia.

 

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Zeiss lansează un cadru complet fără oglindă, cu editare de imagini în cameră PDF Imprimare
International
Luni, 02 Noiembrie 2020 15:44

                  After two years since its first appearance, the Zeiss ZX1 full-frame mirrorless camera is finally up for sale

        Renowned lens maker Zeiss hit the show floor at Photokina 2018 with a full-frame mirrorless camera designed for shooting, editing and sharing all from the one device. Now the ZX1 has finally gone from concept to reality. And it's pricey.

     "The concept of the Zeiss ZX1 opens up new ways in digital and connected photography," said Jörg Schmitz, head of Zeiss Consumer Products. "The Zeiss ZX1 combines the potential and superior image quality of a full-frame camera with the mobile experience and intuitive use of smartphones for photography."

Out front is a newly developed, non-interchangeable Distagon 35-mm f/2 T* lens that's paired with a 37.4-megapixel full-frame (24 x 36-mm) CMOS image sensor housed within the 5.59 x 3.66 x 3.7-in (142 x 93 x 93-mm) body. The camera is reported to make use of contrast- and phase-detection autofocus and rocks ISO80 to 51,200 light sensitivity.

 

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Super-white paint reflects 95.5 percent of sunlight to cool buildings PDF Imprimare
International
Joi, 22 Octombrie 2020 12:09

Xiulin Ruan (left) and Joseph People (right) test out samples of the new cooling paint

Researchers from Purdue University have developed a new white paint that can reflect over 95 percent of sunlight, which can cool the surface even lower than the ambient temperature. Painted on a building, the new paint could help cut cooling costs and energy use.

It’s a basic fact of physics that white surfaces and objects reflect more light, and therefore remain cooler. Theoretically, that could be harnessed to help keep buildings cool – after all, air conditioning is one of the biggest guzzlers of energy in the summer months, and studies suggest that painting buildings white can cool entire cities.

Researchers from Purdue University have developed a new white paint that can reflect over 95 percent of sunlight, which can cool the surface even lower than the ambient temperature. Painted on a building, the new paint could help cut cooling costs and energy use.

 

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