2nd launch attempt scrubbed.
A fuel leak forced NASA to call off its second attempt to launch the Artemis 1 moon mission on Saturday (Sept. 3).
Scientists have worked out how to use an infrared laser to charge devices at a distance. The system can deliver up to 400 milliwatts of power up to a distance of 30 meters (100 feet). That amount of power is sufficient to charge small sensors and other tech, and with developments, it could be possible to charge mobile devices too.
The work, published in the journal Optics Express, focused on a method called distributed laser charging. They showed that an infrared laser (whose wavelength can’t harm skin or eyes) was shined through a spherical ball lens towards a device with a photovoltaic receiver of 10 by 10 millimeters (0.4 by 0.4 inches).
The receiver is small enough to be attached to many mobile devices and sensors, and the team showed that it was able to convert 400 milliwatts to 85 milliwatts of electrical power. A small but significant result.
Thermoelectric devices convert thermal energy into electricity by generating a voltage from the difference in temperature between the hot and cold parts of a device.
To better understand how the conversion process occurs at the atomic scale, researchers used neutrons to study single crystals of tin sulfide and tin selenide. They measured changes that were dependent on temperature.
The measurements revealed a strong correlation between changes in the structure at certain temperatures and the frequency of atomic vibrations (phonons). This relationship affects how the materials conduct heat.
“We don’t need any energy input, and it bubbles hydrogen like crazy. I’ve never seen anything like it,” said UCSC Professor Scott Oliver, describing a new aluminum-gallium nanoparticle powder that generates H2 when placed in water – even seawater.
Aluminum by itself rapidly oxidizes in water, stripping the O out of H2O and releasing hydrogen as a byproduct. This is a short-lived reaction though, because in most cases the metal quickly attains a microscopically thin coating of aluminum oxide that seals it off and puts an end to the fun.
But chemistry researchers at UC Santa Cruz say they’ve found a cost-effective way to keep the ball rolling. Gallium has long been known to remove the aluminum oxide coating and keep the aluminum in contact with water to continue the reaction, but previous research had found that aluminum-heavy combinations had a limited effect.
Circa 2016
A radically new form of lithium-oxygen batteries avoids many of the problems that have prevented the uptake of what is, in theory, the ultimate transportation battery. If the work can be scaled up, it could mark the end of gasoline-powered cars.
The cost, weight, and insufficient lifespan of batteries represents a major obstacle to electric cars replacing internal combustion engines on our roads. There are two paths to address this: One, like Aesop’s tortoise, involves slow incremental improvements in existing lithium-ion batteries, collectively bringing down the cost and extending the range of electric vehicles.
Continue reading “Lithium-Oxygen Battery May Spell The End Of The Age Of Oil” »
Linear analysis plays a central role in science and engineering. Even when dealing with nonlinear systems, understanding the linear response is often crucial for gaining insight into the underlying complex dynamics. In recent years, there has been a great interest in studying open systems that exchange energy with a surrounding reservoir. In particular, it has been demonstrated that open systems whose spectra exhibit non-Hermitian singularities called exceptional points can demonstrate a host of intriguing effects with potential applications in building new lasers and sensors.
At an exceptional point, two or modes become exactly identical. To better understand this, let us consider how drums produce sound. The membrane of the drum is fixed along its perimeter but free to vibrate in the middle.
As a result, the membrane can move in different ways, each of which is called a mode and exhibits a different sound frequency. When two different modes oscillate at the same frequency, they are called degenerate. Exceptional points are very peculiar degeneracies in the sense that not only the frequencies of the modes are identical but also the oscillations themselves. These points can exist only in open, non-Hermitian systems with no analog in closed, Hermitian systems.
Orsted.
In its bid to achieve net zero carbon emissions by 2050, the U.K. is banking heavily on wind-generated power. To this effect, it commissioned the Hornsea One project, which was the largest offshore wind farm in the world at the time of achieving fully operational status in 2020. Two years later, the Hornsea 2 project is fully operational and has claimed the bragging rights for being the largest offshore wind farm in the world.
Kyiv will lose nearly two-thirds of its deposits if the Kremlin is successful in annexing Ukrainian territory.
At least $12.4 trillion worth of Ukraine’s essential natural resources, including energy and mineral deposits, are now under Russian control.
“The Kremlin is robbing Ukraine” of its natural resources, the backbone of it’s economy, according to an analysis by SecDev posted by Washington Post on August 10.
It can generate 1.3 gigawatts of clean energy.
Hornsea 2, the world’s largest offshore wind farm located in the North Sea, has gone fully operational, a press release from its builder, Orsted, said. In its bid to achieve net zero carbon emissions by 2050, the U.K. is banking heavily on wind-generated power. To this effect, it commissioned the Hornsea One project, which was the largest offshore wind farm in the world at the time of achieving fully operational status in 2020. Two years later, the Hornsea 2 project is fully operational and has claimed the bragging rights for being the largest offshore wind farm in the world.
The Hornsea zone, an area of the North Sea covering more than 2,000 km2, is also set to include Hornsea 3. The 2.8 GW project is planned to follow Hornsea 2 having been awarded a contract for difference from the UK government earlier this year.
Hornsea 2 has played a key role in the ongoing development of a larger and sustainably competitive UK supply chain to support the next phase of the UK’s offshore wind success story. In the past five years alone, Ørsted has placed major contracts with nearly 200 UK suppliers. Ørsted has invested GBP 4.5 billion in the UK supply chain to date and expects to make another GBP 8.6 billion of UK supply chain investments over the next decade.
Continue reading “Hornsea 2, the world’s largest windfarm, enters full operation” »
Circa 2012 face_with_colon_three
(PhysOrg.com) — Sometimes total electrical isolation is a good thing — and that’s the idea behind a power-over-fiber (PoF) communications cable being developed by engineers at Sandia National Laboratories.
It’s common to isolate communications between systems or devices by using fiber optic cables, said Steve Sanderson of Sandia’s mobility analysis and technical assessment division. But when power also is required, sending it down a copper wire can at times be a safety issue, and substituting it with battery power may not be suitable or practical, he said.
It can generate 1.3 gigawatts of clean energy.
