Halftimes?

[Red Sea Shadow]

I've brought together a piece on half times and the effect of their values. It's in the second issue of Tech Diving Mag. I'd appreciate your feedback.

 

[rjack321]

Why did you think the golden ratio applied?

I'm a little surprised you thought there might be differences? The actual numbers are fairly arbitrary and not really based on actual tissues.

 

[Red Sea Shadow]

The actual numbers are fairly arbitrary and not really based on actual tissues.

Then the question should be, why did Buhlmann change them?

 

[lobstah]

Then the question should be, why did Buhlmann change them?

Because he tried to make his equations match the experimental data in a different (better?) way?

 

[Red Sea Shadow]

Because he tried to make his equations match the experimental data in a different (better?) way?

I'd say that would affect the M node and/or the delta M, not the half time.

 

[rjack321]

Then the question should be, why did Buhlmann change them?

What lobstah said, he didn't attempt to measure the half time of a kidney.

As long as you have a decent spread from very short (few mins) up to beyond necessary from most sport divers (days) you're own comparisons illustrate the absolute half times don't make much difference. It probably would make a difference if you paired down the number of compartments to something silly small, like 3 or 4. The offgassing "steps" would be rather abrupt then.

 

[Red Sea Shadow]

What lobstah said, he didn't attempt to measure the half time of a kidney.

Neither did I.

As long as you have a decent spread from very short (few mins) up to beyond necessary from most sport divers (days) you're own comparisons illustrate the absolute half times don't make much difference. It probably would make a difference if you paired down the number of compartments to something silly small, like 3 or 4. The offgassing "steps" would be rather abrupt then.

And that what the article proves, not only by programming, but also by executing real dives.

 

[rjack321]

You're the one who asked for feedback.

I'm still surprised you thought that selecting a slightly different set of arbitrary numbers spanning the same basic range would reach some dramatically different modeling conclusion than the parent numbers.

I still don't know what evidence you have which suggests that the golden ratio applies to tissue half times. If you have some, I'd like to know about it as this would be "new" information to me.

 

[Red Sea Shadow]

I'm still surprised you thought that selecting a slightly different set of arbitrary numbers spanning the same basic range would reach some dramatically different modeling conclusion than the parent numbers.

It's not a slightly different set of arbitrary numbers. It's a set of less numbers yet covering the same (actually a wider, but this makes no difference) range.

I didn't expect anything. I've just run the numbers then tried them to prove the concept. BTW, normally VPM-B variations don't produce "dramatic" differences, yet every variation is different than the others.

I still don't know what evidence you have which suggests that the golden ratio applies to tissue half times. If you have some, I'd like to know about it as this would be "new" information to me.

None. The golden ratio was incorporated to come up with a "new" set of compartment half times distributed over a particular range. That's it.

 

[Red Sea Shadow]

Tech Diving Mag is looking for new, well-illustrated technical diving articles in English for the next issue. If interested, please let me know what you can contribute. Also take a look at the submission guidelines at Tech Diving Mag | Free online technical diving magazine