China has designated some cities and entities to trial blockchain applications, underscoring the importance Beijing is attaching to this particular technology.
In 2019, President Xi Jinping called on China to “seize the opportunities” presented by blockchain, giving his personal backing to the technology.
The Chinese capital Beijing and mega city Shanghai as well as Guangzhou in the south are all part of the pilot projects. Local government departments, universities, banks, hospitals, car companies and power firms are among the 164 entities chosen by China to carry out trial blockchain applications.
We’ve often heard it said that springs come in in all shapes and sizes…except for the one you need. In light of this, the hardware hacker would do well to keep the tools and knowledge required to make a custom spring close at hand when building something that moves. Luckily, all it really take is some stiff metal wire, a rod, and patience.
Unless you’ve got a 3D printer, that is. In which case, we’d suggest you print out this very clever “Spring Factory” designed by [Vincent Baillet]. The simple tool, consisting of just two parts, makes it easier and faster to make consistent DIY springs when compared to traditional methods. Rather than trying to eyeball the spacing of the coil as you wind the wire around the mandrel, this design does it for you.
As seen in the video, springs made with this tool look very professional. Not only does the threaded mandrel keep the spacing between coils even, it also makes sure all the springs you produce are identical. This can be especially important with projects that need to use multiple matching springs. [Vincent] says his handy tool works with piano wire from 0.8 to 1.2 mm, and slightly thicker if plain steel.
Electrolysis is a key component of the cost of green hydrogen, and a Korean team says it’s made a huge breakthrough with an anion exchange membrane that’s not only much cheaper than current proton exchange tech, but offers some 20 percent better performance.
Electrolysis is the process of splitting water into hydrogen and oxygen, and when powered by renewable energy, it’s shaping up to be a key step in the production of green hydrogen. Green hydrogen is set to play a substantial role in the race to zero emissions, offering a high energy density that makes it an attractive option in several hard-to-decarbonize activities where batteries just don’t make sense.
Typically, electrolyzers use proton exchange membranes (PEMs), in which an anode and a cathode in an electrolyte material are separated by a membrane designed to allow positively-charged hydrogen ions to pass through as they’re attracted by the cathode. Here they combine with electrons to form hydrogen gas, which is collected, and oxygen is released at the anode.
Talk by Prof Giles Hammond, University of Glasgow. Join us in person at the Augustine United Church or online via our YouTube channel.
In this talk I will describe work that has been undertaken to renovate a 20 Grubb – Parsons telescope at University of Glasgow. I will begin with a brief history of the company, charting some of the telescope this company built for international observatories. I will then describe the Glasgow 20, which had a sister telescope in Edinburgh. The renovation required a complete rebuild of the RA and Dec clock drive, in addition to re-aluminising the mirrors. I will finish with some images/observations from the instrument.
Located in Vieira do Minho in the district of Braga, Casa na Caniçada is a second home built on a densely wooded 0.75-acre site next to the Caniçada reservoir.
An existing building of poor design and construction quality was removed to make way for the three-storey house designed by local office Carvalho Araújo.
We’re all used to swapping RAM in our desktops and laptops. What about a GPU, though? [dosdude1] teaches us that soldered-on RAM is merely a frontier to be conquered. Of course, there’s gotta be a good reason to undertake such an effort – in his case, he couldn’t find the specific type of Nvidia GT640 that could be flashed with an Apple BIOS to have his Xserve machine output the Apple boot screen properly. All he could find were 1GB versions, and the Apple BIOS could only be flashed onto a 2GB version. Getting 2GB worth of DDR chips on Aliexpress was way too tempting!
The video goes through the entire replacement process, to the point where you could repeat it yourself — as long as you have access to a preheater, which is a must for reworking relatively large PCBs, as well as a set of regular tools for replacing BGA chips. In the end, the card booted up, and, flashed with a new BIOS, successfully displayed the Apple bootup logo that would normally be missing without the special Apple VBIOS sauce. If you ever want to try such a repair, now you have one less excuse — and, with the GT640 being a relatively old card, you don’t even risk all that much!
