Researchers have devised a way to extract energy from the photosynthesis process of algae, according to an announcement from Concordia University.

Suspended in a specialized solution, the algae forms part of a "micro photosynthetic power cell" that can actually generate enough energy to power low-power devices like Internet of Things (IoT) sensors.

Photosynthesis produces oxygen and electrons. Our model traps the electrons, which allows us to generate electricity," [says Kirankumar Kuruvinashetti, PhD 20, now a Mitacs postdoctoral associate at the University of Calgary.] "So more than being a zero-emission technology, it's a negative carbon emission technology: it absorbs carbon dioxide from the atmosphere and gives you a current. Its only byproduct is water.

[...] Muthukumaran Packirisamy, professor in the Department of Mechanical, Industrial and Aerospace Engineering and the paper's corresponding author, admits the system is not yet able to compete in power generation with others like photovoltaic cells. The maximum possible terminal voltage of a single micro photosynthetic power cell is only 1.0V. But he believes that, with enough research and development, including artificial intelligence-assisted integration technologies, this technology has the potential to be a viable, affordable and clean power source in the future.

It also offers significant manufacturing advantages over other systems, he says. "Our system does not use any of the hazardous gases or microfibres needed for the silicon fabrication technology that photovoltaic cells rely on. Furthermore, disposing of silicon computer chips is not easy. We use biocompatible polymers, so the whole system is easily decomposable and very cheap to manufacture.

In the paper the researchers also described it as a âoemicrobial fuel cellâ...

Abstract credit: https://slashdot.org/story/429671

A hacker has gained access to internal tools used by the location tracking company Tile, including one that processes location data requests for law enforcement, and stolen a large amount of customer data, such as their names, physical addresses, email addresses, and phone numbers, 404 Media reports. From the report:

The stolen data itself does not include the location of Tile devices, which are small pieces of hardware users attach to their keys or other items to monitor remotely. But it is still a significant breach that shows how tools intended for internal use by company workers can be accessed and then leveraged by hackers to collect sensitive data en masse. It also shows that this type of company, one which tracks peoples' locations, can become a target for hackers. "Basically I had access to everything," the hacker told 404 Media in an online chat. The hacker says they also demanded payment from Tile but did not receive a response.

Tile sells various tracking devices which can be located through Tile's accompanying app. Life360, another location data focused company, acquired Tile in November 2021. The hacker says they obtained login credentials for a Tile system that they believe belonged to a former Tile employee. One tool specifically says it can be used to "initiate data access, location, or law enforcement requests." Users can then lookup Tile customers by their phone number or another identifier, according to a screenshot of the tool.

Abstract credit: https://slashdot.org/story/429499

Starting from 2030, Mastercard will no longer require Europeans to enter their card numbers manually when checking out online -- no matter what platform or device they're using. Mastercard will announce Tuesday in a fireside chat with CNBC that, by 2030, all cards it issues on its network in Europe will be tokenized. In other words, instead of the 16-digit card number we're all accustomed to using for transactions, this will be replaced with a randomly generated "token."

The firm says it's been working with banks, fintechs, merchants and other partners to phase out manual card entry for e-commerce by 2030 in Europe, in favor of a one-click button across all online platforms. This will ensure that consumers' cards are secure against fraud attempts, Mastercard says. Users won't have to keep entering passwords every time they try to make a payment, as Mastercard is introducing passkeys that replace passwords.

The world's largest solar farm, in the desert in northwestern Xinjiang, is now connected to China's grid. The 3.5-gigawatt (GW), 33,000-acre solar farm is outside Urumqi, Xinjiang's capital. The state asset regulator's website cited the Power Construction Corp of China and said it came online on Monday. The solar farm will generate about 6.09 billion kilowatt hours (kWh) of electricity annually. Assuming an EV consumes about 3,000 kWh per year, 6.09 billion kWh could power 2.03 million EVs annually.

The world's largest solar farm in Xinjiang is part of China's megabase project, a plan to install 455 GW of wind and solar. The megabase projects are sited in sparsely populated, resource-rich areas and send their generated energy to major urban centers, such as on China's eastern seaboard. China now boasts the three largest solar farms in the world by capacity. The Ningxia Tenggeli and Golmud Wutumeiren solar farms, each with a capacity of 3 MW, are already online.

In a new blog post, Ethereum co-founder Vitalik Buterin has shared his thoughts on three issues core to Ethereum's decentralization: MEV, liquid staking, and the hardware requirements of nodes. The Block reports:

In his post, published on May 17, Buterin first addresses the issue of MEV, or the financial gain that sophisticated node operators can capture by reordering the transactions within a block. Buterin characterizes the two approaches to MEV as "minimization" (reducing MEV through smart protocol design, such as CowSwap) and "quarantining" (attempting to reduce or eliminate MEV altogether through in-protocol techniques). While MEV quarantining seems like an alluring option, Buterin notes that the prospect comes with some centralization risks. "If builders have the power to exclude transactions from a block entirely, there are attacks that can quite easily arise," Buterin noted. However, Buterin championed the builders working on MEV quarantining through concepts like transaction inclusion lists, which "take away the builder's ability to push transactions out of the block entirely." "I think ideas in this direction - really pushing the quarantine box to be as small as possible - are really interesting, and I'm in favor of going in that direction," Buterin concluded.

Buterin also addressed the relatively low number of solo Ethereum stakers, as most stakers choose to stake with a staking provider, either a centralized offering like Coinbase or a decentralized offering like Lido or RocketPool, given the complexity, hardware requirement, and 32 eth minimum needed to operate an Ethereum node solo. While Buterin acknowledges the progress being made to reduce the cost and complexity around running a solo node, he also noted "once again there is more that we could do," perhaps through reducing the time to withdraw staked ether or reducing the 32 eth minimum requirement to become a solo staker. "Incorrect answers could lead Ethereum down a path of centralization and 're-creating the traditional financial system with extra steps'; correct answers could create a shining example of a successful ecosystem with a wide and diverse set of solo stakers and highly decentralized staking pools," Buterin wrote. [...]

Buterin finished his post by imploring the Ethereum ecosystem to tackle the hard questions rather than shy away from them. "...We should have deep respect for the properties that make Ethereum unique, and continue to work to maintain and improve on those properties as Ethereum scales," Buterin wrote. Buterin added today, in a post on X, that he was pleased to see civil debate among community members. "I'm really proud that ethereum does not have any culture of trying to prevent people from speaking their minds, even when they have very negative feelings toward major things in the protocol or ecosystem. Some wave the ideal of 'open discourse' as a flag, some take it seriously," Buterin wrote.

Abstract credit: https://slashdot.org/story/428637

Visa is rolling out new technology that will allow the payments giant to share more information about customers' preferences [non-paywalled source] based on their shopping history with retailers as it seeks to remain a top player in the competitive e-commerce space. From a report:

The data will be shared via the payments giant's proprietary "tokens," which provide an added layer of security between a consumer's bank information and a merchant. Shopping inclinations and other information based on past transactions -- such as preferred categories, like movies or golf -- will be shared via token with retailers with the consent of consumers.

"It's almost entirely blind to almost all consumers," Visa Chief Executive Officer Ryan McInerney said in an interview of the company's token technology. "They just know their payments work better." The sharing of shopping data via token is one of a handful of innovations Visa unveiled at a conference in San Francisco, where it's based. Visa, one of the largest e-commerce technology companies in the world, is finding itself increasingly fending off competitors seeking larger slices of the fees merchants must pay to carry out consumer transactions.

Abstract credit: https://slashdot.org/story/428471

Last week, NASA announced it is working with a technology development company on a new propulsion system that could transport humans to Mars in only two months -- down from the current nine month journey required to reach the Red Planet. Gizmodo reports:

NASA's Innovative Advanced Concepts (NIAC) program recently selected six promising projects for additional funding and development, allowing them to graduate to the second stage of development. The new "science fiction-like concepts," as described by John Nelson, NIAC program executive at NASA, include a lunar railway system and fluid-based telescopes, as well as a pulsed plasma rocket.

The potentially groundbreaking propulsion system is being developed by Arizona-based Howe Industries. To reach high velocities within a shorter period of time, the pulsed plasma rocket would use nuclear fission -- the release of energy from atoms splitting apart -- to generate packets of plasma for thrust. It would essentially produce a controlled jet of plasma to help propel the rocket through space. Using the new propulsion system, and in terms of thrust, the rocket could potentially generate up to 22,481 pounds of force (100,000 Newtons) with a specific impulse (Isp) of 5,000 seconds, for remarkably high fuel efficiency. [...]

The pulsed plasma rocket would also be capable of carrying much heavier spacecraft, which can be then equipped with shielding against galactic cosmic rays for the crew on board. Phase 2 of NIAC is focused on assessing the neutronics of the system (how the motion of the spacecraft interacts with the plasma), designing the spacecraft, power system, and necessary subsystems, analyzing the magnetic nozzle capabilities, and determining trajectories and benefits of the pulsed plasma rocket, according to NASA.

Abstract credit: https://slashdot.org/story/428225

The blog Its FOSS has 15,000 followers for its Mastodon account — which they think is causing problems:

When you share a link on Mastodon, a link preview is generated for it, right? With Mastodon being a federated platform (a part of the Fediverse), the request to generate a link preview is not generated by just one Mastodon instance. There are many instances connected to it who also initiate requests for the content almost immediately. And, this "fediverse effect" increases the load on the website's server in a big way.

Sure, some websites may not get overwhelmed with the requests, but Mastodon does generate numerous hits, increasing the load on the server. Especially, if the link reaches a profile with more followers (and a broader network of instances)... We tried it on our Mastodon profile, and every time we shared a link, we were able to successfully make our website unresponsive or slow to load.

It's Foss blog says they found three GitHub issues about the same problem — one from 2017, and two more from 2023. And other blogs also reported the same issue over a year ago — including software developer Michael Nordmeyer and legendary Netscape programmer Jamie Zawinski.

And back in 2022, security engineer Chris Partridge wrote:

[A] single roughly ~3KB POST to Mastodon caused servers to pull a bit of HTML and... an image. In total, 114.7 MB of data was requested from my site in just under five minutes — making for a traffic amplification of 36704:1. [Not counting the image.]

Its Foss reports Mastodon's official position that the issue has been "moved as a milestone for a future 4.4.0 release. As things stand now, the 4.4.0 release could take a year or more (who knows?)."

They also state their opinion that the issue "should have been prioritized for a faster fix... Don't you think as a community-powered, open-source project, it should be possible to attend to a long-standing bug, as serious as this one?"

Abstract credit: https://slashdot.org/story/428030

cross-posted from: https://lemmy.smeargle.fans/post/145396

HN Discussion

Canadian legislators proposed 19,600 amendments—almost certainly AI-generated—to a bill in an attempt to delay its adoption.

Meanwhile, in Southern California, nonprofit news site Canary Media reports that an old gas combustion plant is being replaced by a "power bank" named Nova.

It's expected to store "more electricity than all but one battery plant currently operating in the U.S."

The billion-dollar project, with 680 megawatts and 2,720 megawatt-hours, will help California shift its nation-leading solar generation into the critical evening and nighttime hours, bolstering the grid against the heat waves that have pushed it to the brink multiple times in recent years... The town of Menifee gets to move on from the power plant exhaust that used to join the smog flowing from Los Angeles... And the grid gets a bunch more clean capacity that can, ideally, displace fossil fuels...

Moreover, [the power bank] represents Calpine's grand arrival in the energy storage market, after years operating one of the biggest independent gas power plant fleets in the country alongside Vistra and NRG... Federal analysts predict 2024 will be the biggest-ever year for grid battery installations across the U.S., and they highlighted Calpine's project as one of the single largest projects. The 620 megawatts the company plans to energize this year represent more than 4% of the industry's total expected new additions.

Many of these new grid batteries will be built in California, which needs all the dispatchable power it can get to meet demand when its massive solar fleet stops producing, and to keep pace with the electrification of vehicles and buildings. The Menifee Power Bank, and the other gigawatts worth of storage expected to come online in the state this year, will deliver much-needed reinforcement.

The company says it's planning "a portfolio" of 2,000 megawatts of California battery capacity.

But even this 680-megawatt project consists of 1,096 total battery containers holding 26,304 battery modules (or a total of 3 million cells), "all manufactured by Chinese battery powerhouse BYD, according to Robert Stuart, an electrical project manager with Calpine. That's enough electricity to supply 680,000 homes for four hours before it runs out."

What's remarkable is just how quickly the project came together. Construction began last August, and is expected to hit 510 megawatts of fully operational capacity over the course of this summer, even as installation continues on other parts of the plant. Erecting a conventional gas plant of comparable scale would have taken three or four years of construction labor, due to the complexity of the systems and the many different trades required for it, Stuart told Canary Media... That speed and flexibility makes batteries a crucial solution as utilities across the nation grapple with a spike in expected electricity demand unlike anything seen in the last few decades.

The article notes a 2013 Caifornia policy mandating battery storage for its utility companies, which "kicked off a decade-long project to will an energy storage market into existence through methodical policies and regulations, and the knock-on effects of building the nation's foremost solar fleet."

Those energy storage policies succeeded in jumpstarting the modern grid battery market: California leads the nation with more than 7 gigawatts of batteries installed as of last year (though Texas is poised to overtake California in battery installations this year, on the back of no particular policy effort but a general openness to building energy projects)... California's interlocking climate regulations effectively rule out new gas construction. The state's energy roadmap instead calls for massive expansion of battery capacity to shift the ample amounts of solar generation into the evening peaks.

"These trends, along with the falling price of batteries and maturing business model for storage, nudged Calpine to get into the battery business, too."

Abstract credit: https://slashdot.org/story/427236

Hello, I noticed some of my early posts (less than a year ago) disappeared. I did not receive notification about the removal. Hence I suppose it could be due to one of those:

• the instance hosting the community got defederated
• the community I posted in was removed
• there is some automatic cleanup job of old posts on Lemmy.ml

This is not mentioned in Lemmy.ml's presentation section. Does this instance implement pruning? (if so; what is the retention duration?) Is it possible to check the retention policy of a Lemmy instance?