NASA Flights Map Critical Minerals From Skies Above Western US - Technology Used To Chart Other Worlds Is Revealing Minerals In The American West That Are Critical To The Country’s Renewable Energy Future.
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https://science.nasa.gov/earth/nasa-flights-map-critical-minerals-from-skies-above-western-us/ <-- shared technical article
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https://popo.jpl.nasa.gov/mmgis-aviris/?mission=GEMx <-- shared GEMx data collection portal
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#GIS #spatial #mapping #remotesensing #earthobservation #mineral #mineralogy #mining #criticalminerals #USWest #renewableenergy #lithium #GEMx #fedscience #cost #economics #USGS #NASA #GeologicalEarthMappingExperiment #lithium #aluminum #rareearthelements #neodymium #cerium #nationalsecurity #cleanenergy #batteries #smartphones #cellphones #naturalresources #steel #steelmill #dependency #localsources #importing #survey #geology #geologicmapping #exploration #spectrometers #hyperspectral #EMIT #mine #extraction #EarthMRI #opendata
@USGS @nasa
#Neodymium
Advanced Magnet Manufacturing Begins in the United States
https://spectrum.ieee.org/advanced-magnet-manufacturing-in-us
#ycombinator #rare_earth_metals #neodymium #mp_materials #permanent_magnets #rare_earth_production
#Plutocracy
Gina “What’s yours is mine to Mine” Hancock-Rinehart plundering for profits plan comes together via minion politicians
(Bossy boots billionaire biz as usual)
What's a reliable and reasonably priced source to buy #neodymium #magnet directly from China? In between #dealextreme going down and the EU regulation on small magnets, prices went through the roof and quality down the drain.
I'd want both round magnets to glue/lodge into #3dprinting as well as spheres and those new-ish odd-shaped ones for #fidget and #boardgame use...
"Just use #Aliexpress" is not useful unless accompanied by a specific, reliable vendor.
#boost appreciated, as always.
#Neodymium is one of the more reactive lanthanides—a group of similar metallic elements numbered 57-71 on the periodic table. These 15 elements, plus scandium and yttrium, are termed “rare earth elements”
https://knowledgezone.co.in/posts/Rare-Earth-Elements-666a7a81027a2b69dfb032e7
Spinning Magnets Do Your Dice Rolling for You https://hackaday.com/2024/06/28/spinning-magnets-do-your-dice-rolling-for-you/ #randomnumber #neodymium #flip-dot #magnet #Games #dice #die #rng #RPG #dd
Using the Wind and Magnets to Make Heat https://hackaday.com/2024/06/25/using-the-wind-and-magnets-to-make-heat/ #greenhacks #induction #neodymium #windmill #halbach #heat
Neodymium: atomic number: 60; weight: 144.242; Lanthanide, rare earth; discovery: 1885—Carl Auer von Welsbach #Poetry #Science #History #Neodymium (https://sharpgiving.com/thebookofscience/items/e060.html)
Guitar speaker με #neodymium μαγνήτες vs classic ceramic...
Εκτός από το βάρος, σε open back (#fender style) καμπίνα είναι έρωτας :)
Tattoo-Removal Laser Brought Out of Retirement for a Megawatt of Fun https://hackaday.com/2023/10/11/tattoo-removal-laser-brought-out-of-retirement-for-a-megawatt-of-fun/ #tattooremoval #highvoltage #LaserHacks #neodymium #megawatt #q-switch #Cr:YAG #Nd:YAG #optics #laser #pulse
Eco-Friendly Space Magnets Made in the Lab:
https://www.popularmechanics.com/technology/infrastructure/a44785656/new-metal-boosts-batteries/
#magnets #rareearths #neodymium #praseodymium #dysprosium #space #astronomy #meteorites #meteorite #magnet #materials #iron #Tetrataenite #nickel
Magnetic Gearbox, Part 2: Axial Flux Improves Performance https://hackaday.com/2023/07/27/magnetic-gearbox-part-2-axial-flux-improves-performance/ #neodymium #gearbox #magent #stator #torque #Parts #axial #rotor #flux
#makers anyone got a good suggestion for where to get #neodymium #magnets? I'm looking for disks ~4mm in diameter or long thin bars (~50mm x 4mm x ? )
searching on amazon sucks.
China Plans to Ban Exports of Rare Earth Magnet Tech
China is considering banning the export of technologies used to produce high-performance #rare #earth #magnets deployed in electric vehicles, wind turbine motors and other products, citing “national security” as a reason, it has been learned.
With the global trend toward decarbonization driving a shift toward the use of electric motors, China is believed to be seeking to seize control of the magnet supply chain and establish dominance in the burgeoning environment sector.
China is estimated to hold an about 84% share of the global market in #neodymium magnets and an over 90% interest in #samarium #cobalt magnets.
If China bans the export of such technologies, it would be difficult for the United States and Europe, which do not traditionally manufacture rare earth magnets, to newly enter the market, thus making those countries totally dependent on China, according to a European source
https://japannews.yomiuri.co.jp/world/asia-pacific/20230405-101753/
@riskable ED: I was thinking that ~50 MGOe was common for #neodymium magnets, and indeed they can meet and exceed that, but it looks like most of what's on the market is well under that, esp. on the high temperature end. Ex:
https://www.arnoldmagnetics.com/products/neodymium-iron-boron-magnets/
So that makes this all the more exciting :)
@riskable My focus is on the #EV space. But temperature matters there too, because #neodymium magnets start to lose field strength in the range of temperatures motors actually experience (~80°C). So you have to use higher amounts of #dysprosium, which means even higher cost & somewhat lower nominal field strengths. So #tetrataenite could be a really good fit, IF the achievable field strengths can approach the theoretical.
Need to watch this space, as I have investments in some rare earth plays.
Hey, any #researchers (#physics, #materials science, etc) doing #research on magnetic materials [#magnetism]? I'd like your take on the prospect of #tetrataenite as an alternative to #neodymium #magnets. My understanding is that the theoretical magnetic energy product is about 80% that of available neodymium magnets, but that raises the question of how much realizable magnetic energy products might approach theoretical.
Falling Down the Labyrinth With Wooden Microphone Design
It used to be that when we featured one of [Frank Olson]'s DIY ribbon microphone builds, it was natural to focus on the fact that he was building them almost exclusively from wood. But despite how counterintuitive it may seem, and for as many comments as we get that his microphones shouldn't work without metal in the ribbon motors, microphones like this wooden RCA Model 77 reproduction both look and sound great.
But ironically, this homage features a critical piece that's actually not made of wood. The 77's pickup pattern was cardioid, making for a directional mic that picked up sound best from the front, thanks to an acoustic labyrinth that increased the path length for incoming sound waves. [Frank]'s labyrinth was made from epoxy resin poured into a mold made from heavy paper, creating a cylinder with multiple parallel tunnels. The tops and bottoms of adjacent tunnels were connected together, creating an acoustic path over a meter long. The ribbon motor, as close to a duplicate of the original as possible using wood, sits atop the labyrinth block's output underneath a wood veneer shell that does its best to imitate the classic pill-shaped windscreen of the original. The video below, which of course was narrated using the mic, shows its construction in detail.
If you want to check out [Frank]'s other wooden microphones, and you should, check out the beautiful Model 44 replica that looks ready for [Sinatra], or the Bk-5-like mics he whipped up for drum kit recording.
#mischacks #cyanoacrylate #labyrinth #microphone #model77 #neodymium #ribbon #veneer #wood
Attack of the Magnetic Slime Robots
[Li Zhang] and his colleagues at the Chinese University of Hong Kong (CUHK) have developed a blob of goo that can navigate complex surroundings, grow an 'arm', grasp a wire and move it, encapsulate a small object and carry it. As explained in the research paper, the secret is in the non-Newtonian material the bots are made of.
You can make a similar concoction at home, usually called "slime", with corn starch and water. Deformed slowly, it will move like a fluid. Deformed rapidly, it behaves like an elastic solid. CUHK's version is polyvinyl alcohol, glass coated NdFeB microparticles (neodymium magnets), and borax.
This dual behavior lets the robot do amazing things. Placed on a surface, they made the blob extend pseudopods by dragging underneath with a magnet, then used a circular field to make it grasp and transport a wire. They used a similar technique in the other axis to swallow an object. The CUHK group are promoting this as a way to retrieve foreign objects in the body (like an accidentally swallowed button cell).
Researchers will need to develop a non-toxic coating before it can be used in the body.
Nd magnets are made by sintering Nd2O3 or NdFeB in a strong magnetic field. Nd2O3 is available from SigmaAldrich at only slightly eye watering prices. Polyvinyl alcohol and borax are easily available. This seems like a hobbyist do-able project (Nd is toxic, use precautions).
We've been covering micro robots for some time. Back in 2014 we covered swarm micro robots. This project uses an external field to move a small Nd magnet, and all the way back in 2014 we covered early work in this field.
A New Wrinkle on Wooden Ribbon Microphones
Not too many people build their own microphones, and those who do usually build them out of materials like plastic and metal. [Frank Olson] not only loves to make microphones, but he's also got a thing about making them from wood, with some pretty stunning results.
[Frank]'s latest build is a sorta-kinda replica of the RCA BK-5, a classic of mid-century design. Both the original and [Frank]'s homage are ribbon microphones, in which a thin strip of corrugated metal suspended between the poles of magnets acts as a transducer. But the similarities end there, as [Frank] uses stacked layers of walnut veneer as the frame of his ribbon motor. The wood pieces are cut with a vinyl cutter, stacked up, and glued into a monolithic structure using lots of cyanoacrylate glue. The video below makes it seem easy, but we can imagine getting everything stacked neatly and lined up correctly is a chore, especially when dealing with neodymium magnets. Cutting and corrugating the aluminum foil ribbon is no mean feat either, nor is properly tensioning it and making a solid electrical contact.
The ribbon motor is suspended in a case made of yet more wood, all of which contributes to a warm, rich sound. The voice-over for the whole video below was recorded on a pair of these mics, and we think it sounds just as good as [Frank]'s earlier wooden Model 44 build. He says he has more designs in the works, and we're looking forward to hearing them, too.
#mischacks #audio #bk5 #cyanoacrylate #microphone #neodymium #ribbon #transformer #walnut
