bertm

On a similar note, you could feed the warms iron particles for a few days and maybe use magnetometer mapping.

This misses the NVIDIA Jetson/Orin/Thor line of GPU-enabled edge computers which are more comparable with Raspberry Pis. The Jetson Orin Nano Super is $250. Another feature which we find useful is the native NVMe drive support. For the price, this blows RPis out of the water for imaging applications.

https://www.nvidia.com/en-us/autonomous-machines/embedded-sy...

A friend and I found a contractor to give us a couple of these lights in the Phoenix area. We traced the LEDs back to a Seoul Semiconductor Phosphor on-chip design. We still have a suspicion that LM80 testing didn’t catch this and it was due to a thermal cycling failure. https://m.youtube.com/watch?v=4Mll-YDDAF4

I had that same thought. I travel a bunch for work and would love to be able to wire up a RPi/Arduino remotely to a sensor or other device and run a test or two.

Deep dive into why streetlights across the US are failing.

Dr. Levenspiel came up in another thread about elephant curves. He tried for many years to get this article published on the aerodynamics of dinosaurs and how this might reflect on atmospheric pressure at the time. There is a long list included of rejections from various scientific publications in the 90s. Seemed fitting for Hacker News.

I have to plug Dr Octave Levenspiel. Levenspiel was a professor emeritus when I did my undergrad. He did much of the work on industrial fluidized beds among other things. The elephant curve discussions were a criticism of the complex multi-parameter fitting for heterogenous catalysis of the time. https://levenspiel.com/elephants/

He tried for a while to get an aerodynamics paper published on the flight of dinosaurs. http://levenspiel.com/wp-content/uploads/2016/02/DinosaurW.p...

This intellectual curiosity reminded me a bit of Feynman and his plate spinning.

I used this all the time. Sad to see it go.

Found the complaint in PACER if anyone is interested in reading.

https://www.scribd.com/document/420311557/Complaint-19-06570

I worked for a long time as a chemical engineer making cadmium containing quantum dots. We had many discussions inside the company about complying with the EPA's TSCA regulations. https://www.epa.gov/laws-regulations/summary-toxic-substance...

The reason why these regulations exist was because toys and consumer goods would be imported with red paint that contained cadmium.

Usually the importer is responsible for complying or at least reporting to the EPA under TSCA.

Great analysis. I wonder how a semi-log graph would look.

"A study published in 2007 from the US National Cancer Institute, for instance, found that men that took multivitamins were twice as likely to die from prostate cancer compared to those who didn’t. And in 2011, a similar study on 35,533 healthy men found that vitamin E and selenium supplementation increased prostate cancer by 17%."

They do cite quite a few articles that show negative effects of specific vitamins.

Could be neat if they become the defacto way to launch and sell opensource hardware. I'd be interested to see if that pencils out as a viable/scalable business.

Great contrast to the OP. They sound like a highly competent team, making a better "coffee".

LoRa is a really cool technology. We are incorporating it into our networking stack/ hardware module. From field testing, we've seen about 4-6 miles line of sight, and about a mile through an urban environment (parking garage, apartment building, etc). Plus the bare radio chips are less than $10 bucks.

Try out Low Power Labs Monteino with the HopeRF, RFM95 LoRa module. The radio library is lacking but you can get up and running quickly. https://lowpowerlab.com

If you want something a little more enterprisy and turn-key, try the new guys (I work for them). The Patch module has both a BLE and LoRa radio. https://www.filament.com

Another article on the same topic: http://www.computerworld.com/article/2969396/internet-of-thi...

"Filament looks really interesting. It would be possible to dismiss this fledgling business as a hodgepodge of buzzwords, but the credibility of its investor pool, the novel approach it seems to be taking to the problem, and the very real opportunity that exists for IoT networks all combine to make this an interesting play."

edit: a better written version: http://www.coindesk.com/filament-nets-5-million-for-blockcha...

"To build its technology, Filament is using a series of protocols that include the blockchain transaction database behind Bitcoin; BitTorrent, the popular peer-to-peer file sharing software; Jose, a contract management protocol that is also used in the OAuth authentication service that lets people use their Facebook ID to log in and manage permissions to other sites around the web; TMesh, a long-range mesh networking technology and Telehash for private messaging."

Full report: http://www.mckinsey.com/~/media/McKinsey/dotcom/Insights/Bus...