Catch up on stories from the past week (and beyond) at the Slashdot story archive

 



Forgot your password?
typodupeerror
×

Comment Circling the Drain ! (Score 1) 95

I do not know 23andMe nor it's financial conditions. But I do know that blaming the victims and worse, blaming customers, is far more a legal strategy to minimize liability than a marketting strategy to attract customers. I also presume that 23andMe decisionmakers are aware of this difference, and have chosen it. I suspect they're selling-out their database to someone who will likely abuse it.

Submission + - GMail Delays ? 1

redelm writes: Anyone else notice delays from gmail senders? For the past week or so, my regular gmail writers have taken vabiable 1+hr (up to 12h) to reach me at yahoo. From the Received: headers, these are interal delays between google.com mailservers.

Comment T R O L L E D !! (Score 1) 347

Sapolinsky by his own admission is being controversial. And committing a serious logical fallacy on the order of "Absence of proof is not proof of absence". He is advocating a negative which cannot be proven and can be disproven by a single counter-example. Essentially a statement in favor of determinism and against randomness.

Feh!

Comment Not TANSTAAFL (Score 1) 135

While not obvious, the energy to power the net process comes from gravity, specifically a reduction of sea-level (worldwide). You are taking out volume, so the remainder has to decrease. Think of the process in a tight wellbore. It will stop quickly because the annulus level drops too much.

Comment Why NOT? (Score 2) 135

I haven't done the calcs to determine whether 1400 ft of seawater is enough to power the membrane and the freshwater lift but it seems likely. The modules wouldn't need external power but would only be viable if placed in a deep current to carry away the brine. You might be able to power a brine turbine/backwash from the lift.

Comment Isodope Ratios (Score 1) 175

Carbon is not the only element with interesting isotopes. Before trying DNA (why not?) drop a sample in the mass-spec and measure them. Chlorine, Calcium, Magnesium, Iron and others all have stable isotopes with known terrestrial prevalences. If multiple ratios are off, that indicates ET likely. If not, it is more likely la chupacabra (xupakabra?) and you might as well sequence the DNA!

Comment Re:OPEN LOOP SCRUBBERS (Score 1) 62

I should add that open-loop scrubbers need _a_lot_ of seawater to absorb the SOx while keeping temperatures down. The limit I remember is 140'F (60'C) for scaling. So all of the fuel heat goes into the wake, one way or another. Creates a bigger water thermal track that if the hot exhaust gasses were discharged to atmosphere as usual.

Comment OPEN LOOP SCRUBBERS (Score 1) 62

One popular "solution" to the IMO 0.5%w Sulfur restriction was not to buy expensive low-S fuel but to continue to buy hi-S (3.5%w) and route the exhaust gas through a new scrubber. Easily done because the engines are usually low-speed diesels with lots of exhaust pressure. Any two-stroke engines might have needed a [bigger] blower.

The scrubbers are packed to increase surface area. And fed seawater as absorbtion medium! I don't know if any pretreatment is applied beyond a strainer. Then the rich absorbant is just dumped overboard, I hope with a submerged exit into a selected hi-mix streamline of the wake. YES, ALLOWED BY IMO !!

In fairness, all this SOx/NOx and some CO2 would have gotten eventually washed into the ocean by rain anyways. But more dispersed. The tracks now just hidden underwater and likely more concentrated.

Comment P Y O I L (Score 2) 121

This sounds like Chevron wants to dump plastics Pyrolysis Oil into bunker. Maybe as a vicosity cutterstock more likely just to get rid of the difficult-to-reprocess PyOil.

Beyond the shrill tone, there might be a real concern: it is hard to keep chlorinated plastics out of a plastic waste stream. PVC for one. These will produce all sorts of chlorinated aromatics by pyrolysis. None of them healthy and some incredibly nasty (estrogen-mimetics like 2,3,7,8 TCDD).

Slashdot Top Deals

All great discoveries are made by mistake. -- Young

Working...