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Everything posted by Frank

  1. Your post reminded me of that tragedy and I thought it was important to mention, especially on an open forum. How would you avoid heating above the auto-ignition point? I'm thinking maybe not a blowtorch? I've been wondering how to do this safely for a while.
  2. Full of water would be best - no fumes. A kid died using a plasma torch on a recycled empty drum despite it being rinsed out.
  3. Musk wants to use his boring company TBM for sewers. Maybe rainwater/storm sewers could also work? Might be a way to retrofit where no separate storm sewers exist.
  4. Maybe look for visual programming for python? Seems there are a bunch of options there.
  5. OK. Not sure exactly what the node is representing - a group of files that were pre-selected (or chosen) by hand? So it would create a sort of meta-hierachy or graph for the filesystem?
  6. Looks like you already found it, so is this promotion?
  7. One problem with hydrogen is it is cheaper to strip carbon from methane than to do water electrolysis! Not a problem (for profits) until there is a carbon tax. I just read that a nuclear plant in California isn't renewing their license, not because there is a push against nuclear there, but because they can't make money. Renewables are cheaper and there is a dip in demand between 9 and 5 which is bad for base-load power. They could produce hydrogen in the lull, but I guess it's not profitable either, or maybe within the lifetime of the plant, renewables will start producing the hydrogen more cheaply - who knows.
  8. Built in a mining pit, collects water too. Not for deserts I guess. Solar power tower - Wikipedia: https://en.wikipedia.org/wiki/Solar_power_tower#Novel_applications
  9. Sandstorms damage panels, no water to clean the panels, not close to where people live, generally. Seems like these problems can be overcome, but the $ is probably not there (yet).
  10. One artificial moonlit test city, maybe - it's not a great idea. Solar panels in deserts can power the world. Some projects already exist.
  11. This might interest you: China May Soon Have a Second (Artificial) Moon: https://www.space.com/42183-china-artificial-moon.html Downside: even from LEO, reflection is about 30 km wide (IIRC) because of Etendue - Wikipedia: https://en.wikipedia.org/wiki/Etendue which means to get 1:1 sunlight, the mirror would need to match that size! Also, rain and clouds means no light. There are also ideas about solar panels in space with energy beamed to earth using microwaves.
  12. So "pumped"? Good point but a bit pedantic.
  13. Fine if it rains. Need to keep the sides of the reservoir above sea waves, like by flotation. I was told Australian pools by the ocean sometimes get sharks in them. "Because in Australia, sometimes you have to pick a shark out of a pool" https://www.goodthingsguy.com/environment/australia-shark-pool/. So the sides might need to be high enough to keep out marine life. For the ocean rise part, it seems unlikely the mass of antarctic glaciers plus volume expansion caused by temperature increase would equal what is siphoned off and never returned to the ocean (somehow). That would be a lot of very large reservoirs.
  14. Since planetary gears are used in turboprop engines and/or turbofan engines, I think yes. Also, I've noticed a sort of upper limit to existing permanent magnet motors of ~400 Hz or so, is there an induction resonance or high power electronic switching limit, or in other words, what limits the top frequency of electric motors?
  15. Yeah, very close, maybe suggest a "painting" or "wet paint" filter to highlight subtle colour differences, might help to turn on the flashlight too.
  16. Extrasensory colour perception - might be an app for that, one that exaggerates the colour differences it sees the same way an app can be used as a magnifying glass. Depends on the camera sensor's colour sensitivity. Filters might prove handy because of the limited colours actually perceived by camera sensors (red, green and blue), same as our eyes. When it comes to paint though, different light will interact with the paint reflection spectra(?) which may in fact include colour wavelengths we interpolate. This isn't as likely a problem in the given case where we want to discern between wet and dry or between new and old.
  17. Not necessarily, if no practical application exists given the inroads made into other means or, if power is in the atmosphere, how do you charge(ha) people for use? Still not clear why it's "no". It seems to me what Tesla describes is similar to a fluorescent tube, or similar, where current flows through an ionized gas, not transmitted by electromagnetic energy (like wireless phones or toothbrushes).
  18. Here's another article, seems like we need to build one to test out theories. Ionized atmosphere VS EM waves. Nikola Tesla On Wireless Energy Transmission: http://teslaradio.com/pages/tesla.htm
  19. What exactly makes "wireless power" crackpot? Also, the radio transmitter would not be based on EM waves, but on ionized atmosphere - does that actually work? Tesla planned on modulating at ~11 Hz, really low for a radio signal.
  20. I think (new to this too) that the concept below is the intent - to (super)charge or ionize the atmosphere? How Powering with Atmospheric Electricity Works - YouTube:
  21. Hydrogen powered, fuel cell electric aircraft company: Electric Air Taxi – HY4: http://hy4.org/sample-page
  22. Thanks! For short hops flights, maybe consider compressed hydrogen instead, still higher volumetric energy density than Li-ion batteries and much lighter. Then there's Skylon for LH2 powered spaceflight - Skylon (spacecraft) - Wikipedia: https://en.wikipedia.org/wiki/Skylon_(spacecraft) Hydrogen Turbojet engines are being developed.
  23. How would burning hydrogen in an ICE or turboprop compare? More noise, but efficiency? Also, SOFC output is so hot, it is used to run a turbine to increase efficiency in generator situations. Could some version of this work to combine electric and thermal power?
  24. DC to AC is called an inverter and they are a fairly common item - price varies with Watts delivered. Don't think it will run very long though unless you have large batteries available.
  25. Where does polonium come from and how much energy is needed to extract it?
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