Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - a10t2

Pages: 1 ... 203 204 [205] 206 207 ... 282
The Pub / Re: Japan quake
« on: March 17, 2011, 01:44:09 AM »
If im not mistaken the plants lost power and there was no other way to pump water to the cooling towers setting up a chain of events that either may or will lead to a full out meltdown.

That's not entirely correct. This was a triple failure. The earthquake severed the power lines operating the pumps, as a result of which the backup generators kicked on. Minutes later, the tsunami washed through and destroyed the backup generators. In the following days, with grid power still not available, hydrogen explosions and fires pretty much destroyed the rest of the plants' systems, and ensured that any containment measures taken would be irreversible. That's worth repeating: as soon as they had the opportunity to do so, the operator junked all four reactors, including the two that were apparently under control. None of them will ever operate again, and the capital cost alone of that will certainly exceed a billion US dollars.

All that aside, these reactors were designed to survive a 7-8 Richter earthquake (depending on whose scale, and whose reports you choose to believe). To anticipate the reactor cores surviving a magnitude 8.9 quake is like expecting a car that's certified safe in a head-on collision at 60 mph to also survive a collision at 118 mph. The fact that (apparently) only one of the four pressure vessels has suffered a breach is a testament to how over-engineered they are.

This is an accident of almost incomprehensible scope, for the nuclear industry, and a radiation release of unforgivable scale. That still doesn't make it dangerous. Why we play by different rules than other power plants, I don't know, but there you have it. Every story about this will use the word "Chernobyl", but the phrase "Deepwater Horizon" will fade from memory within a few years. I don't think there's anything funny about the situation. But I also won't stand silent in the face of that kind of hypocrisy.

If anyone has factual questions about nuclear power, or the dangers of radiation exposure, I'll answer them to the best of my abilities.

The Pub / Re: Japan quake
« on: March 16, 2011, 11:31:56 AM »
She's gone from suck... to blow!

Now that's just silly. I'm warning this thread not to get silly again.

The Pub / Re: Japan quake
« on: March 16, 2011, 06:19:09 AM »
The workers have fled (supposedly) due to the radiation.
The utility evacuated non-essential personnel after a radiation monitor at the gatehouse spiked to 6 mSv/hr, with consistent readings over 2 mSv/hr. There are still about 50 people working inside the perimeter.

All Grain Brewing / Re: Adding Magnesium to Brewing Liquor
« on: March 15, 2011, 04:39:37 PM »
This doesn't provide definitive guidance on Mg's effect of yeast growth and performance, but I believe that it doesn't hurt as long as the Mg concentration is kept moderate.  You will start to have taste impact at concentrations of 30 ppm.  Therefore, I recommend that a preferred Mg range is 5 to 30 ppm in the mash and sparging water.

Based on the only controlled study I've seen on it, there isn't an impact on fermentation performance until you get over 200-300 ppm anyway. I'll try to dig up the paper when I get home.

The Pub / Re: Japan quake
« on: March 15, 2011, 03:54:12 PM »
Make a really long pipe.  One that stretches from the ground up into outer space.  At one end you have a vacuum, at the other end you've got 1 atmosphere of pressure.  A 14.7 psi of pressure differential... Voila!  instant vacuum cleaner.

Unless you've figured out a way to turn off the gravity inside the pipe, I don't think you've cracked that nut yet. ;)

The Pub / Re: Japan quake
« on: March 15, 2011, 09:45:03 AM »
Yes, but which ones turn you into the Hulk?  Gamma.

See? It's win-win. SEAN SMASH!

The Pub / Re: Japan quake
« on: March 15, 2011, 09:19:30 AM »
Hopefully any "fallout" will end up in the Pacific before it blows over the US mainland or any islands. I'm more fearful of alpha and beta than gamma so would like to see that stuff in the ocean than on human skin, crops or living enviromments.

That's pretty much backwards, actually. Alphas are high-energy, but most of that is tied up in their mass (~4 amu). They can't even penetrate skin. Plus most of the major alpha emitters are transuranics, so there's limited potential for uptake into the ecosystem. Betas are a little bit more of a concern, but most of the emitters (with the notable exception of Sr-90) are prompt sources, so by this point they've already been through a couple half-lives and are falling off. The major sources of radiation in nuclear fuel are the long-lived fission products like Cs-137, which tend to be gamma emitters. They have half-lives of a few decades, and limited potential for chemical toxicity, so they tend to wind up in the environment.

General Homebrew Discussion / Re: Surface Sterilization of Dry Hops
« on: March 14, 2011, 03:14:01 PM »
I've never heard of a brewery doing that either, and a search at ProBrewer didn't turn up anything. I think the biggest negative is that you'd boil off some of the volatile aromatics. So you wouldn't get as much bang for you buck as you would by just throwing in the hops. You'd also isomerize some alpha acids, but unless you were transferring the water along with the hops I don't think there would be a perceptible increase in bitterness as a result.

So before I pitch my yeast I should probably take a least one more gravity reading after a good aeration, correct?

In my experience you still won't be able to get consistent readings. The only way to be accurate is to take the reading from the wort before topping off, then divide by the dilution ratio.

Also, I get an estimated OG of ~1.077, so you may not have been as far off as you think. That's assuming 43 point-gal/lb for the DME, 36 for the LME, 45 for the brown sugar, and 38 for the honey.

Was it a partial boil?

Yeast and Fermentation / Re: Attenuation surprise
« on: March 13, 2011, 06:50:30 PM »
I meant thermometer, in case you were resting at lower temperatures than you planned, but with that mash schedule I'm actually surprised your attenuation is so *low*. You're doing everything you can to make a highly fermentable wort.

The Pub / Re: Recent Earthquakes caused by Experimentation?
« on: March 13, 2011, 06:48:56 PM »
a billion watts of energy into the ionosphere
how much is several days out put from one generation power station concentrated
into a beam.

A watt is a unit of power, not energy, so it isn't several days' output from anything. But yes, a billion watts (one gigawatt) is roughly the power output of a modern generating station.

Setting aside the fact that none of these people have any scientific acumen whatsoever, you know how I know this is BS? If there was a shadowy conspiracy willing to kill thousands of people in order to do whatever it is they're doing, why wouldn't they bump off this handful of people on the internet?

Yeast and Fermentation / Re: Attenuation surprise
« on: March 13, 2011, 06:26:04 PM »
What was the mash schedule like? Did you calibrate your thermometer recently? I've never used 1332, but 1272 will routinely hit >80% ADF.

All Grain Brewing / Re: Improving Efficiency
« on: March 13, 2011, 05:31:47 PM »
Would not all the liquid in the tun be uniform after mashing as far as sugar content? If not, would a quick stir make it so? The "first drip" should be he same as the last.

You do get stratification in the mash, IME. I've seen wort at the bottom that's more than twice the gravity of a sample taken from the top. I recirculate for the last 10 minutes of the mash for just that reason.

Also, the full runoff volume is only one constant gravity in batch sparging. In fly sparging, ideally you'd monitor the gravity of the runnings throughout the sparge, and stop sparging when they drop below about 3°P.

The Pub / Re: Recent Earthquakes caused by Experimentation?
« on: March 13, 2011, 04:12:03 PM »
So... there are people who think radio waves cause earthquakes? ::)

Pages: 1 ... 203 204 [205] 206 207 ... 282