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Revolutionary Scuba Mask Creates Breathable Oxygen Underwater On Its Own

stray Design vs Reality / Surgical approach (375 comments)

Apart from the fact that the numbers just don't add up and you'd have to flow enormous amounts of seawater through the device, there are a couple of other problems:

- Breathing pure oxygen is fine at surface pressure, but it quickly becomes toxic when submerged

- You want the rest of your breathing air (21% oxygen or less, as you descend) to be made up of an inertial gas

- Lungs need to inhale and exhale to get the gas exchange in the alveoli to work, so you need a full lung volume of gas available at any time, not just the amount of oxygen required to run your body

- To get rid of CO2, you either have to release gas into the surrounding water, or scrub the CO2 using something such as soda lime

- Apart from the scrubber, you need to have these additional parts for it all to work:
    1) some kind of counter-lung to allow for breathing movement
    2) some kind of pressurized gas to increase the amount of gas in your lungs/counter-lung to compensate for the compression of it all at depth and to dilute the O2 content of the breathing gas

So, great idea. You have to lug a full rebreather system with you for it all to work, but luckily you can leave the 2 liter oxygen tank at home and use these fantastic gills instead - until the not-yet-invented next-generation battery powering the extremely powerful "Micro-Compressor" runs out of juice.

The only way this could work out to be something useful would be to hook up a major blood vessel to the device, allowing for gas exchange O2 CO2 between the water flow and the blood through the device, bypassing the lungs altogether. As an alternative, fill the lungs with a liquid (as in liquid breathing) and do the gas exchange between the breathing liquid and the water. Less messy that surgery.

1 year,9 days

Winter weather this year has been ...

stray Oh, the poll wasn't about the layout? (439 comments)

At first, I somehow missed the actual poll question, thinking the poll options were for feedback about the new layout.
Only the last one didn't make any sense. Heh.

more than 3 years ago

Breach Exposes 19,000 Active US, UK Credit Cards

stray Re:I hardly think there's an issue with Google. (232 comments)

From what I can see the unprotected directory is a *deliberate* setup by perpetrators who compromised a number of merchant sites.

The compromised servers send the CC transaction details to the unprotected site (now suspended by the registrar) for easy retrieval by the perps.

The security breach obviously happened on the individual merchant sites, the leaking unprotected directories on the hackers' drop box is just a symptom.

Somebody check if all merchant sites use a common web shop application?

more than 5 years ago

Robotic Cannon Loses Control, Kills 9

stray Not a new high tech weapon system (580 comments)

> A new high tech weapon system demonstrated one of the prime concerns [...]

The GDF-005 is from the 1985, the GDF series's first instalment was the GDF-001 way back in the 50s.
So it seems this high tech weapon system is 20+ years old.

more than 7 years ago


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