An early-Universe spike in dark energy could resolve a disagreement between two cosmic-expansion-rate measurements, but such a spike may conflict with observations of quasar spectra.
Vanishing Act for Water Waves
Posted in energy, mathematics
Cavities at the sides of a water channel can cause waves to be completely absorbed, suggesting new techniques for protecting coastlines.
If waves of water, light, or sound were to impinge upon a hypothetical object called a perfect absorber, they would be neither reflected nor transmitted; they would simply vanish. Researchers have now demonstrated perfect absorption using ordinary water waves traveling down a narrow channel [1]. The waves are canceled out by their own reflections from cavities built into the side of the channel. With further development, the researchers believe that the effect could be used to reduce erosion or protect sensitive structures by using an array of elements deployed near coastlines.
“We were motivated by the need to control or absorb waves in rivers or to protect coastlines,” says mathematical physicist Agnes Maurel of ESPCI Paris. “Completely absorbing wave energy is even better than redirecting it, and you can also imagine perhaps harvesting such energy.”
A new interpretation of high-harmonic generation—the cornerstone of attosecond physics—paves the way for quantum applications of this process.
The unfrozen water-filled channels that crisscross multicrystal ice help feed ice growth, which can lead to fractures in materials such as asphalt and cement.
LOL they couldnt take the heat for One Day LOL. Pile It On 😂
Altman is “ambivalent” about coming back.
OpenAI’s largest investor, Microsoft, said in a statement shortly after Altman’s firing that the company “remains committed” to its partnership with the AI firm. However, OpenAI’s investors weren’t given advance warning or opportunity to weigh in on the board’s decision to remove Altman. As the face of the company and the most prominent voice in AI, his removal throws the future of OpenAI into uncertainty at a time when rivals are racing to catch up with the unprecedented rise of ChatGPT.
A spokesperson for OpenAI didn’t respond to a request for comment about Altman discussing a return with the board. A Microsoft spokesperson declined to comment.
The United Arab Emirates has launched the Al Dhafra solar farm – now the world’s largest single-site solar farm – ahead of COP28.
The 2-gigawatt (GW) solar farm is 22 miles (35 km) from Abu Dhabi and features almost 4 million bifacial solar panels. It will power nearly 200,000 homes and eliminate over 2.4 million tonnes of carbon emissions annually.
It created 4,500 jobs during the peak of the construction phase, and the solar panels were installed at an average rate of 10 megawatts (MW) a day during construction.
More than a dozen volcanos are erupting at the same time worldwide, and three new eruptions joined the list this week.
The Smithsonian Institute’s Global Volcanism Program tracks new eruptions and updates its list of currently erupting volcanos on Wednesdays. The most recent update shows three new eruptions, bringing the list’s total to 19 eruptions at once. The list doesn’t include all erupting volcanos.
The new volcanic eruptions have some people voicing their concerns on social media.
Terabase Energy has successfully completed its first commercial solar installation using Terafab, its automatic solar-installing robot.
The Terafab robot – aka the “construction automation platform” – installed 17 megawatts (MW) of the 225 MW White Wing Ranch project in Yuma County, Arizona, on which solar tech company Terabase Energy is working alongside developer Leeward Renewable Energy (LRE) and contractor RES.
The Terafab robot completely eliminates the manual lifting of heavy steel tubes and solar panels – an industry first. Terabase Energy says that its robot achieved labor productivity improvements of 25% compared with manual installation, and the setup improves working conditions for solar technicians, as they’re housed in shaded and cooled conditions. The robot’s precision also enables the 100% return of solar panel packaging for reuse by the manufacturer.
Thanks to the Hubble Space Telescopes, astronomers can confirm that there’s a rocky exoplanet just a couple dozen light years away.
We’re still reeling from the just-breaking news that OpenAI’s enigmatic CEO and figurehead Sam Altman has been sacked by the company’s board of directors. And make no mistake that we’re still intensely curious what went down behind the scenes that led the company to part with Altman during the exact moment when its ascendant tech is driving the nascent AI industry. But as the dust settles, there’s another looming question: what’s the deal with Mira Murati, the company’s interim CEO who’s stepping in to lead immediately?
One thing’s for sure: she’s no lightweight. Here’s what Fast Company had to say earlier this year: