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Everything posted by Externet

  1. Overhead sensors in freeways...

    Did someone 'pulled my leg' a looong time ago telling me these were to detect 'illegal/undisclosed' transportation of radioactive materials ? Or are those only mass detectors, speed detectors, vehicle counters, toll transponders... ?
  2. Hello, I need a material for my project

    Something like these crucibles ? ----> https://duckduckgo.com/?q=ceramic+crucible&t=canonical&iax=1&ia=images
  3. An "ideal" transport of the future

    That is capacity four. You can install capacity ones inside these booths every block or in front of boutiques, or in offices, the barber shop, no parking needed... Just dial its number and you show up there :
  4. With few working satellites in orbit yet, is the Galileo working today, even with delayed capture, or poor precision, or both ?
  5. An "ideal" transport of the future

    Nothing better than ---->
  6. Gyroscopic contraption...

    A bicycle, hanged off ground. Wheels turning. No or fixed steering, (or, both wheels on a rigid frame.) Trying/pushing to 'topple' it, some torques become active. If the wheels are turning in opposite directions, What torques/forces to expect trying to topple it? Next... wheels with their shafts at a right angle. What torques/forces to expect trying to topple it? Next... 3 spinning wheels with their shafts in the 3 axis. What torques/forces to expect trying to topple it?
  7. Where is the gold ?

    That gold mined centuries ago since ancient times, the gold from spaniard conquerors, the gold from mines production in all continents. Physically, where is it ? Cannot believe that a substantial amount is in jewelry or museums. The amount of gold produced in say 3000 years, has to be a huge amount. Where is it now ?
  8. Perhaps this could be in chemistry... Please move if needed. Latex gloves have a short life, degrade in air, and perhaps in contact with some liquids. Nitrile gloves, and other materials gloves in the market... Which one has the longest duration -not puncture related- ? Need to save certain small items inside cut-off fingers off flexible gloves, sealed; and looking for longest life material. Any suggestions ?
  9. Hi. After a peaceful follower of the Quran reads (Surah 5:51) (Surah 2:191-193, 216-218, 244) (Surah 3:157-158, 169, 195) (Surah 4:71-74, 84,91) (Surah 5:35) (Surah 8:12, 17, 39, 60-65, 74-75) (Surah 9:5, 14, 20, 24, 29, 36, 38, 39, 41, 73, 111) (Surah 22: 58, 78) (Surah 25:52) (Surah 29:6) (Surah 47:4) (Surah 61:4, 11) (Surah 66:9) ----> Disobeying these above, by being peaceful towards other religions means going against the Quran ?
  10. Question to any peaceful follower of the Quran...

    That is not the point. Not concluding anything but asking. Here is one : ----> http://corpus.quran.com/translation.jsp?chapter=5&verse=51 If a Quran follower is prevented by the Quran from being peaceful and friendly towards other religions, is the peaceful follower acting against the Quran ?. Yes, No, or no answer.
  11. Seems every culture/nation wants / has developed its own 'dialect' I believe there is an international sign language, at least in intentions. Can a deaf person that only knows a particular variation of sign language from his country, understand a 'decent' amount of international signs to carry a cross conversation ? If such international language was someday a reality; could it bypass spoken languages as a -say chinese- sustain a sign conversation with a -say hebrew- ? And all other cultures permutations, without learning all the involved spoken languages themselves ?
  12. Design, develop and conduct an experiment / device to measure the propagation speed of gravity.
  13. Sunlight Mimicking LEDs

    English... if the thread title was, instead, LEDs mimicking sunlight ; would it have the same meaning ? Better ? Worse ?
  14. Superb craftsmanship worth sharing. Enjoy : ---->
  15. Lightning rods downsides ?

    Hi. Lightning rods, with their properties of attracting and providing a safer electrical path to ground have their advantages to prevent a house to burn or the unpredictable damages caused by a lightning bolt. Is there any cons; like -say having them installed will promote more hits to the dwelling rod, instead of less hits that may be diverted to nearby trees or other buildings ? Would the hits be much less destructive, but more frequent ? For the brutal voltages involved; would a plain reinforcement iron bar as rod and path to proper grounding instead of a 1/2" copper path be reasonably comparable ? A 1/2" 'rebar' tiny additional resistance to the brutal strike voltage should not be significantly detrimental, is it ? (This is not about using the structural 'rebar', but as an external path)
  16. More gripes

    In other forums that use this same 'architecture'; when being logged-in times out, all typed contents in the reply box get saved automatically, actually happens every minute while logged; and reported being so. After re-logging-in, prompts the choice to restore saved content. That saves a lot of frustration from losing very elaborated responses wiped out to never recover. Perhaps that feature is hidden to be implemented among all the tweaks.
  17. Early computing...

    Hi. What did all those indicator lamps tell the operator ? The buttons, knobs, dials, selected what ?
  18. Lightning rods downsides ?

    Thanks. Yes, iron in 6+ metres long bars can be an ohm or two more resistive than copper. Which I suspect of little effect in huge voltages, as the high tension transmission lines behave to minimize losses with other than copper. Yes, the conductor is the one more likely to be hit instead of the building. So see no downsides ? Other than more often soiled pants from the much louder and sudden thunder scare originated a few metres away...
  19. Seems posts are not numbered any more. Or I could not see such. Could help for referencing as before. Also, from the previous board version, as I was caught in the transition posting : Are social networks still intruding or just not shown now ?
  20. 'Magicians' tricks...

    Which illusion, performance has impressed you the most ? That unforgettable one that dropped your jaw to the floor and still has you scratching your head ?
  21. Coming soon: SFN upgrades to new forum software

    Triple backup current contents first ! Wait for Murphy to get sedated. Thank you.
  22. Hi. I understand the malicious infections getting into computers. I do not understand why a XYZ corporation has to be in risk/ exposed to the net perils in order to conduct business and preserve sanity. All the files for the operation of a corporation, their designs, their development documents, their personnel files, sales records, data, products, payrolls and many more internal documentation of daily activity. Why do they have to be in the same computers/net with internet access ? Not saying to pull the net plug, but having NO PLUG at all ! A totally isolated internal workings. When there is need to access the web, well, another physical system of computers to be used. What hurdles would such internal-only totally isolated network pose, with zero anti-viral software ? Am missing something here...
  23. Good if those records being a copy in an internet-exposed read-only computer/server. Not the protected main computer kept in safe isolation from crooks, which find how to become 'approved personnel' and spread their diarrhea everywhere.
  24. Well, yes, StringJunky. That is the only kind of error, human error. Same error as not implementing isolating computers with vital/private records. See a good degree of laziness here. Mr. Microcrap is not the only office program. But it is easier (less work) for managers to decide/buy that software instead of safe others that do not have to be on-line. If the preference is not to put efforts preventing mishaps, then, let their systems go belly-up and hopefully go bankrupt. The sad part is the ones that decided to do the least amount of preventive work still get their fat checks. Thanks again to my Linux OS for giving me peace.
  25. ... If both bullets being compared have the same mass, volume and shape.