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  • Users: AlbertG
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  1. AlbertG

    Conditional Branching in Perl?

    Greetings! Well, I dug myself in over my head with a basic syntax debacle in Perl for my Linux box. Here's the code sample which I wish to fix: #!/usr/bin/perl $value = '$(pgrep some-process | wc) -gt 0'; TEST: if ($value) { sleep 2; zenity --warning --text="some-process is running."...
  2. AlbertG

    Basic Questions Concerning AC Power . . .

    Good day. I've had a tussle with this for a bit, and just now decided to break down and float it out for community assistance. In the scenario which is at issue, we have a "black box" load which may be essentially resistive or may be partially inductive; but has been precharacterized to...
  3. AlbertG

    nth Roots in Historic Mathcad 4.0?

    Greetings! Well, I dug out my old 4.0 floppies for a quick 5-year check (still good after after 21 years); and got bumbling with the program after a quick install from my trusty CD-R backup. This software is always great fun to work with; still a touchstone of convenience and power ;o) Well...
  4. AlbertG

    Static CR vs. Efficiency: Disappointing Otto Gains?

    Hello folks! Had a niggle to finally look at the foundational formula concerning the relationship of CR to efficiency for the air-standard Otto Cycle, i.e. E = 1 - (1 / CR ^ (K - 1)), where K = 1.4 To my surprise, we see a relatively small increase for E across a significant span of CR values...
  5. AlbertG

    Basic Math Check for the Heating of 304 Stainless . . .

    Hello folks. Ran out of fingers and toes; and just needed a little help with some simple heating work on a small amount of 304 stainless (8000 kg/m3; 500J/kg.K (0-100°C) -- http://www.azom.com/details.asp?ArticleID=965). Here's what I have. First, I am working with what amounts to a...
  6. AlbertG

    (Simple?) Spinning Fluidmass Question . . .

    Hello Folks. I believe that this will be a REALLY simple affair to one of the anointed ;o) OK. We have a square tube 1" in diameter X 2' long spinning at 3,000 RPM (n); filled with H20. Metric: The spinning radius is .3 meters (r); the watermass weight (for the .3 meter radius) is .1944 kg...
  7. AlbertG

    Simple Mass/Acceleration/Power Question . . .

    Good day, Folks. I have a classically-simple question for the community today -- just checking my math and fishing for an additional equation ;o) As a backgrounder, I'm attempting to estimate the power required to sustain a body in motion against the sum of all forces which are working to...
  8. AlbertG

    Ducted Fan Discussion Invitation . . .

    Good day, all. I'm starting this thread as a follow-up to a previous posting (which went on for about 3 years at the forum): thread2-58711 The whole works ended, in my opinion, not so satisfactorily. The stake which seemed to kill off all further viability discussion for the technology was a...
  9. AlbertG

    2NaOH from H2O, NaOH, and ?

    Good day. I have a question for better minds than mine; as I am not a chemicals person myself :o) I am interested in the prospect of changing plain sulfur dioxide scrubwater, sulfurous acid (H2SO3), into a non-tox fluid which might even have some commercial value. I have discovered the...

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