3475: Algoritmo da Alibaba consegue detectar novo coronavírus com 96% de eficácia

CIÊNCIA/Covid-19

O gigante chinês Alibaba revela ter desenvolvido um sistema de Inteligência Artificial que diagnostica rapidamente pacientes com o novo coronavírus com um grau de certeza elevado

O algoritmo de Inteligência Artificial (IA) da Alibaba vai ser disponibilizado para mais de cem hospitais em breve. O novo sistema consegue distinguir casos do Covid-19 e de pneumonia viral com 96% de eficácia, analisando tomografias computorizadas e demora apenas 20 segundos a emitir diagnósticos. A rapidez e o grau de precisão tornam este sistema um aliado valioso no combate à epidemia.

De acordo com o Nikkei Asian Review, os investigadores usaram análises de mais de cinco mil pacientes infectados com o novo coronavírus. Por outro lado, o sistema foi alimentado com as indicações de tratamento e investigações mais recentes neste domínio.

A comunidade científica espera que diagnósticos mais rápidos permitam aos hospitais gerir melhor o fluxo de pessoas que chegam diariamente para ser tratadas. Uma análise mais célere e fiável vai permitir acelerar os ciclos de tratamento e ajudar, potencialmente, a conter o vírus.

O sistema de IA foi desenvolvido pela DAMO Academy, um projecto fundado pela Alibaba em 2017, que contou com um investimento inicial de 15 mil milhões de dólares para três anos.

Recorde-se que o Covid-19 tem causado grande impacto em todos os sectores de actividade. No lado da tecnologia, grandes eventos como o Mobile World Congress, a F8 do Facebook ou a Game Developers Conference foram adiados ou mesmo cancelados, registam-se falhas no fornecimento de componentes para produção de vários aparelhos e o mercado chinês tem mostrado uma redução na procura.

Exame Informática
02.03.2020 às 13h09

 

spacenews

 

3474: Melting ice in Antarctica reveals new uncharted island

SCIENCE

Researchers are calling it Sif Island, after a Norse goddess of the Earth.

The rocky coast of Sif Island peeks out under a mound of Antarctic ice.
(Image: © Gui Bortolotto)

Pointing toward South America like an icy finger, the Antarctic Peninsula is one of the fastest-warming regions on Earth. The peninsula’s two major glaciers — the Thwaites Glacier and the Pine Island Glacier — are retreating toward the mainland faster than new ice can form, chipping away at the continent’s coasts a little more each year.

This week, all that melting ice left behind a surprise that could change maps of the region permanently: an uncharted island, long buried in ice but finally visible above sea level for the first time.

Researchers with the international Thwaites Glacier Offshore Research project discovered the island earlier this week while sailing off the coast of the Pine Island Glacier ice shelf. The small island is only about 1,150 feet long (350 meters) and mostly covered in ice, but rises from the sea with a layer of brown rock distinct from the surrounding glaciers and icebergs.

After making a brief landfall, the researchers confirmed that the island is made of volcanic granite, and even hosts a few resident seals. According to expedition member James Marschalek, a doctoral student at Imperial College London, there is no other rocky outcropping like this visible for more than 40 miles (65 kilometers) in any direction.

The researchers tentatively named the uncharted outcropping Sif Island, after a Norse goddess associated with Earth.

Exciting as the discovery is, the island’s sudden appearance is almost certainly a direct effect of the widespread glacial melt that has become typical in Antarctica in the past decade, Sarah Slack, a member of the expedition and middle school science teacher in Brooklyn, New York, wrote in a blog post.

“At first, we thought maybe an iceberg had become lodged on the outcropping years ago and then melted enough to expose the underlying rock,” Slack wrote on Feb. 26. “But now we think that the ice on the island was once part of the Pine Island Glacier ice shelf, a massive field of floating ice that extends outward into the ocean from the edge of the glacier.”

Peter Neff @peter_neff

Looks like ice retreated from the new “Sif Island” near #ThwaitesGlacier, #Antarctica since the early 2010s, based on a quick look at @googleearth timelapse.@ThwaitesGlacier @GlacierThwaites @rdlarter https://twitter.com/houston_wellner/status/1231700563634642944 

Julia Smith Wellner @houston_wellner

After being the first visitors, we can now confirm that Sif Island is made of granite and that it is covered by remnant ice shelf, and a few seals. Photos by CD Hillenbrand (BAS) and Laura Taylor (UH). @glacierthwaites @glacieroffshore @GAViglione #nbp2002 @BAS_News @UHEAS

View image on Twitter
View image on Twitter
View image on Twitter

Using satellite images from Google Earth, expedition member Peter Neff made a time-lapse model showing how the ice shelf’s steady retreat since 2011 left Sif Island detached and alone in Pine Island Bay. From above, the dollop of ice looks like just another lonely iceberg. Now that its island status has been confirmed, further study of Sif could reveal how the region’s rocky underbelly will continue responding to climate change.

It’s likely that the island emerged due to a process called glacial rebound, Lindsay Prothro, a glacial geologist at Texas A&M University-Corpus Christi who was not involved with the expedition, told Nature.com. When glacial ice melts, it relieves pressure on the underlying continent; in response, the continent may “rebound,” or rise up higher than it previously was. It’s unclear whether rebound hastens or slows the rate at which ice shelves break apart — hopefully, further study of Sif Island could provide some clues.

The team’s expedition is due to end on March 25. After that, a full analysis of Sif Island rock samples can commence.

Originally published on Live Science.

By Brandon Specktor – Senior Writer
28/02/2020