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Comment Re:Understatement 1st Prist (Score 1) 220

After googling for the picture (it's the timing chain setup for the previous generation Audi S4), I found out that this particular engine is renown for how unreliable it is and how expensive is to fix it when it fails (after some 100-110k miles only).

What's failing is not the chain, but the ridiculous rails/tensioners, which are made out of inadequately spec-ed *plastic*. These are the parts that were designed in as planned obsolescence.

Comment Re:DQ'ed (Score 2) 100

I'm pretty sure that they could come up with a method of attaching the centers to the stepper motors without requiring hole drilling.

However, turning the faces faster and faster requires both extreme force and very careful over- and under-shoot control. Eventually, the inertial forces will be so high that the cube will disintegrate (its corners will fly away as their little holding ledges break off).

Comment Re:Deniers? (Score 1) 507

RTD's Achille's heel is the fact that, in order to actually determine the temperature, one needs to trust the absolute value of another resistor in the circuit. This is tricky without regular re-calibration and definitely doesn't qualify for "100 years repeatability".

I had no idea though that they're as popular in industrial applications as they seem to be, at least compared to thermocouples.

Comment Re:Deniers? (Score 3, Insightful) 507

You're joking, right? thermal expansion coefficients are very stable in time and have long been applied to manufacturing very consistent thermometers. I'm pretty sure that a Hg-based one built 100 years ago still has the same accuracy today as when it was brand new.

As long as the glass inner tube is uniform in size, calibration for 0*C in an ice bath and for 100*C in boiling distilled water at 1 atm takes care of its accuracy and linearity.

A thermistor, with its highly nonlinear R=f(temp), is difficult to use to make an accurate thermometer. A thermocouple is better, but you need the cold junction reference.

Comment Re:Perhaps amend the definition of resonance (Score 1) 168

Yes, you're wrong. Pushing someone on a swing *is* how resonance works; you're adding energy to the system at the right time, i.e. resonant with the natural pendulum oscillation.

The analogy doesn't work for the bridge because the wind kept a steady speed; it's as if you're continuously pushing the swing, which, obviously, does not create an oscillation.

Comment Re:Ha! - Federal Income tax is not paid. (Score 1) 543

If you've lived in the US for more than 6 months during the previous calendar year, you owe taxes to uncle Sam. Even if you're here on an H1B visa. A H1B visa holder comes to US for a multi-year stint (then usually "graduates" to a GC), therefore it's almost certain that he/she is going to pay federal taxes and, depending on the local laws, state taxes too.

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