helium   365

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Another helium gas cooled reactor, but with a traditional steam backend
pebble  bed  helium  coolant  gas  nuclear  reactor  power  generator  steam  HTGR 
22 days ago by asteroza
MRI disabled every iOS device in facility : sysadmin
5 months later, everybody knows about this, but still a pretty crazy failure mode, and a really impressive call on the part of this reddit commenter
helium  electronics  diagnose  failure  cool 
5 weeks ago by aaronbeekay
iPhones are Allergic to Helium | iFixit
This is the kind of tale that you don’t hear every day.  During the installation of a new MRI machine, a technician started getting calls that iPhones weren’t working—but Androids were just fine.
materials.science  helium  iphones  mobile  electronics 
november 2018 by po
IPhones are allergic to helium • iFixit
Kyle Wiens on the strange case of a helium leak at a hospital which bricked newer iPhones and Watches - but not Android phones:
<p>Every phone has gyroscopes and accelerometers with micrometer-thin elements. My initial theory, shared by some on Reddit, was that the helium molecules were small enough to get inside these chips and interfere with the mechanical workings.

But there are two problems with this idea: One, Apple isn’t alone in using MEMS gyroscopes—every phone has them. Why weren’t the Android phones affected? Perhaps there’s a bug in iOS that causes crashes when it gets faulty data from the gyro? But the bug impacted Apple Watches, too—and they run WatchOS. Additionally, iPhones earlier than the 6 weren’t affected. It seems unlikely that this was a new software bug that impacted both iOS and WatchOS.

So what else could it be? Well, at the heart of every electronic device is a clock. Traditionally, these are quartz oscillators, crystals that vibrate at a specific predictable frequency—generally 32 kHz. When they were first invented, they enabled the first digital ‘quartz’ watches. Now, these frequency generators are at the heart of every electronic device.

Without a clock, the system stands still. The CPU flat out doesn’t work. The clock is literally the heartbeat of a modern device.

But quartz oscillators have some problems. They don’t keep time as well at high (and low) temperatures, and they’re a relatively large component—1×3 mm or so. In their quest for smaller and smaller hardware, Apple has recently started using MEMS timing oscillators from a specialized company called SiTime to replace quartz components.

Specifically, they’re using the SiT512, ‘the world’s smallest, lowest power 32 kHz oscillator.’ And if the MEMS device was susceptible to helium intrusion, that could be our culprit!</p>

The electron microscope pictures are amazing too.
Apple  helium 
october 2018 by charlesarthur
ASTAR program calculates
stopping-power and range tables for helium ions in various materials
hydrogen  data  helium  ions 
october 2018 by stahl
We Discovered Helium 150 Years Ago. Are We Running Out?
The versatile gas lies at the center of a complex, fragile global market.
helium  gas  rare  economy  change 
august 2018 by xer0x

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