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Comment Re:Clegg's making a stand against it. (Score 1) 79

This is a pretty disingenuous argument, and one that is used by disappointingly frequently by squirming Lib Dems. This is the wording of the pledge:

“I pledge to vote against any increase in fees in the next parliament and to pressure the government to introduce a fairer alternative.”

Nothing about being in government, and it's pretty clear that the wording allows for them being in a coalition. This was a personal promise made by individuals, not just a manifesto point.

Comment Re:Scientists need to be careful to avoid bias (Score 1) 292

It is enormously frustrating for scientists in a wide range of areas that they are required to hold a higher standard of integrity than the politicians, journalists and religious groups that oppose them, and yet this does not appear to carry adequate weight in public and political decision-making.

Comment Re:Yes! (Score 1) 1774

You're generalising; "the public" is a hopelessly vague term. A "high" church with statues etc. is not really aimed at children who haven't had a Christian upbringing, they are aimed at people brought up in that tradition; pretty analogous to science professionals, no? They are open to visitors so that people can pray outside of services, as well as appreciate their art and architecture. An exhibition about evolution is actually likely to be directly aimed at family groups like yours: one of the first things I learned about science communication is that you should never aim anything at "the general public" as you can't please everyone.

Anyway, we're wondering off the point a little. I think we're actually on the same side here; there's a reason churches prefer to teach their religion to children in a sugar-coated way rather than throw them in at the deep end.

Comment Re:It's too bad (Score 2) 933

Seconded. I take glee in the simplicity and power of apt on my netbook, whereas MacPorts is always a last resort. Too much frustration trying to track down the right package name, only to discover that I'm not getting what I expected (e.g. the MacPorts version of yafc doesn't support tab completion). Next time I set a mac up I'm trying Homebrew.

Comment Re:But...? (Score 1) 122

The world has yet to demonstrate that commercial nuclear plants make any financial sense

Is that compared to the energy taken to commission/decommission, or is that compared with the low cost of fossil fuels which don't have to pay for the destruction they will unleash? Current consensus seems to be that it's likely climate change will wreck us before the oil runs out, so relying on current economics is not a very helpful way of decision-making.

Comment Re:Forget about how long it takes, what's the ENER (Score 1) 303

These things should be roughly interchangeable. The Water Online article gives a nice plot with "water permeability" in units of "L/cm2/day/MPa", showing a 2-3 order difference on a log scale. This is a slightly odd set of units, but essentially this is a flux/pressure applied. That is a pretty good metric for membrane performance. Pressure and area will scale with cost and energy in a roughly linear fashion; membrane technology is notorious for not enjoying economy of scale in the same way traditional operations such as distillation do. As this is a theoretical model, we don't know what additional costs and issues there might be in terms of auxiliary systems.

Comment Re:It is a RO membrane, just a really good one (Score 1) 303

You still can't run away from osmotic pressure. If you have a membrane with a different concentration on each side, the solvent (water in this case) will tend to flow to the more concentrated side. This is true even if the membrane offers no resistance; it's simply diffusion at work. This effect is osmosis. In order to counteract this effect, an additional pressure of water is needed to pass water through the membrane. It's called reverse osmosis because you are opposing the usual behaviour of osmosis. If you run the process in "dead-end" mode like a coffee filter, as many seem to be suggesting here, the problem will not be "clogging", the problem will be the huge pressure build-up as salt at the filter becomes more and more concentrated.

TLDR; it's still reverse osmosis, because no membrane can make osmotic pressure disappear.

All of which is not to say that this isn't a very promising proposal. It shouldn't be toooooo hard to test this in the lab in the near future.

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