Domain: wisc.edu
Stories and comments across the archive that link to wisc.edu.
Comments · 1,436
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The face of real science
The first exhibit to go in should be this one, entitled "Electron Band Structure In Germanium, My Ass."
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Re:Free PDF Printer
One of them will allow you to create a pdf file from any document since it acts like a printer (Much like Adobe's). Check out PDF995.
Why check out adware when you can do this just as well for free with vanilla Ghostscript and RedMon? -
Re:EthanolAbout production of ethanol. Note that the raw materials . . . acetaldehyde and ethylene are originally sourced from crude oil if ones goes all the way up the supply.
Much ethanol not intended for drinking is now made synthetically, either from acetaldehyde made from acetylene, or from ethylene made from petroleum. Ethanol can be oxidized to form first acetaldehyde and then acetic acid. It can be dehydrated to form ether. Butadiene, used in making synthetic rubber, may be made from ethanol, as can chloroform and many other organic chemicals. Ethanol is used as an automotive fuel by itself and can be mixed with gasoline to form gasohol. Ethanol is miscible (mixable) in all proportions with water and with most organic solvents. It is useful as a solvent for many substances and in making perfumes, paints, lacquer, and explosives. Alcoholic solutions of nonvolatile substances are called tinctures; if the solute is volatile, the solution is called a spirit.
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The real myth of the CD-ROM ..is that it's meant for storing data. The real purpose of the CD-ROM is to amaze your drunk friends when you cremate one in the microwave .
Whoever thought AOL would give us so many hours of amusement?
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Re:Global Warming?
Let's make cars based on Stirling engines powered by the radioactive decay of Pu-238. You'll only need about 1/2 ton of the stuff per car, and your vehicle could run for hundreds of years!
Plus it will only cost millions of dollars! -
Re:Won't kill you next to the skin...
You have to swallow the stuff for it to kill you.
Actually, swallowing the stuff won't kill you. (All of you who believe Ralph Nader's opinion check here.) The lining of your stomach is pretty thick, and the stuff is too dense to digest. As a result, it passes through without harm. The real problem is plutonium dust that gets inhaled. It can embed itself in your soft lung tissue and increase your risk of cancer. Not to worry, pretty much the only source of such dust is machining of the material. Even when an unprotected Russian RTG burned up in the atmosphere, the smallest particles where the size of a grain of sand. Far too large to cause problems.
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Re:Safe?
Obviously you didn't read this link provided by the poster, which states that Dr. Bernard Cohen challenged Ralph Nader to do just that.
-Spyky -
Re:Safe?
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Condor
Have a look at the Condor Project - I think they're already on it
:-) -
Just a couple months lateI could really have used this a couple months ago, when working up background for this (that was only one of several contributions, the full list can be seen here. And now the impact calculator appears down, so I can't check my back-of-the-napkin calculations...
According to me, at 2600kg/m^3 (a number I based off very sketchy research, but now seems a lot more reasonable), 600m in diameter, with an impact velocity of 2.7E4m/s (which is ~1.0E4m/s higher than the average "small rock" terminal velocity when it burns up), the impact would release as much energy as the entire nuclear arsenal of the world twice over (disregarding ablation during reentry, which I'm guessing would be nominal).
And that's hardly a huge rock, either.
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Just a couple months lateI could really have used this a couple months ago, when working up background for this (that was only one of several contributions, the full list can be seen here. And now the impact calculator appears down, so I can't check my back-of-the-napkin calculations...
According to me, at 2600kg/m^3 (a number I based off very sketchy research, but now seems a lot more reasonable), 600m in diameter, with an impact velocity of 2.7E4m/s (which is ~1.0E4m/s higher than the average "small rock" terminal velocity when it burns up), the impact would release as much energy as the entire nuclear arsenal of the world twice over (disregarding ablation during reentry, which I'm guessing would be nominal).
And that's hardly a huge rock, either.
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they are everywhere!I'm actually a little surprised at the small amount of network tools that have been suggested. While Ethereal is a god send (it recently solved a very puzzling DHCP issue that we were having on one of our networks), it isn't the end of what you need to have.
Buy one linux server, and then discover the wonders that are ping and SNMP. Simple tools such as Nagios and MRTG (or NRG or Cricket) can do wonders for helping spot problem switches/routers and congestion spots.
For example, every device we have is pinged 3 times every minute, and queried for bandwidth usage every 5 minutes. This has helped in finding bottlenecks, and the occasional switch that reboots every few minutes. (MRTG alone convinced the higher ups to buy new gear for our Datacenter and give it a dedicated link to the Core).
Also, setting up a wonderful SNMP trap server can be very useful. It allowed us to find a switch that likes to reboot at random intervals (the switch is 5 years old and being replaced this weekend). Of course, having it send a trap whenever a switch reboots is just the start of what certain switches/routers can do.
Also the use of Snort to sniff traffic that can be potentially malicious can be very helpful in tuning firewalls and finding those script kiddies. (use ACID for a pretty front end)
Another nice tool is NTOP Does almost everything NetFlow does and has a pretty graphical frontend built in. (I recently used this to find out that one of our firewalls was sending gigs of syslog data to the wrong server.)
And with the mention of syslog, might as well throw out a link for syslog-ng. yet another useful tool.
Basically the point of this is to say that sometimes it's best to let your equipment do that talking. They'll usually tell you what's wrong, just as long as you've set them up to do so. I found that once we put a lot of these tools into full production, we were able to cut down on our need to sniff the line whenever problems came up. This isn't to say that Ethereal isn't needed. That's hardly the case. Its use is still huge and shown all the time.
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One question
Do you want to be the one to tell a toddler that they have to try to talk to animals instead of being with his/her father, mother, or family? It may seem like a good idea and might even be effective, but it strikes me that there is something very wrong with attempting to use children as protocol droids. This wouldn't be very safe for toddlers on either a physical or psychological level. Apes aren't Disney characters.
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ASM
I'm currently a CS undergrad. When we first learned assembly it was in MIPS using spim. In our Systems class we had to learn x86 for decompiling and reverse engineering, but you could always run objdump on any x86 machine and read the file where ever. Of course in compilers we used sparc assembly. I never have had the oppurtunity to use PowerPC assmebly in classes, but luckily it is a RISC lang so not to difficult to parse.
What's my point.... Anyway we don't have and x86 bias here. -
Re:hull materialThe loss of the Sheffield due to burning aluminium is a myth, aluminium does not burn except under very special circumstances. Besides which, the Type 42 ships like the Sheffield were built of steel. Aluminium is sometimes used in ships, such as the Type 21, because of its lower weight and better resistance to corrosion, but usually for superstructure rather than hulls. Of course in high-speed catamarans weight is very important.
In any case, the problem with aluminium is that it is softer and melts more easily, which is also part of what happened to Columbia. There's more on aluminium in ships here.
If you have powdered alumimium (or indeed most metals, including iron) and preferably a strong oxidiser mixed with it, then you can get aluminium to burn. In a thermite reaction, powdered aluminium reacts directly with powdered iron oxide in an extremely exothermic reaction which is self-sustaining. But these aren't the conditions you'd get on a ship under attack.
Realistically, the missile and or explosion would just rip more easily through the softer metal, and any resulting fire would weaken the structure. In a vessel of that size and with the thinner dual hulls, that would be fatal enough even with a steel hull. A ship like this really has to rely on stealth or countermeasures to survive.
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Re:Initially I didn't take this seriously but...There is a mature software project called Condor which allows you to do exactly that, build a compute pool out of workstations and optionally dedicated servers. It detects when workstations are idle and matches jobs to suitable resources (architecture, amount of memory and so on). It also handles restarting jobs that fail, migrating jobs when a workstation is no longer idle and so on. It is meant for high-throughput computing, i.e. running a lot of independent jobs, not for massively parallel jobs that do lots of intercommunication.
This can be great for researchers who never seem to get enough computing power or for things like rendering video.
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Re:What about other carbon arrangements?
But AFAIK no brain damage from diamond has been reported
That's because diamonds don't get flushed down the drain, and if they did they would sink to the bottom of the lake and become part of the "muck".
If you Read The Fine Article, that's what the scientists thought would happen to the buckyballs. But in tests they remained suspended in the water and fish and small crustaceans became exposed and subsequently were affected.
There are a couple of other things to remember. Diamond is a crystalline form of carbon, which does make it inert, as other atoms are not attracted to form bonds with it. Buckyball molecules do not have this lattice structure, and are going to be more reactive. Here is a tutorail on the different aspects of carbon chemistry.
There are industrial processes that use diamond (like saws), and the resultant powder can be dangerous. But this is the case for any fine powder that might be inhaled, and the toxicity is going to be dependant upon the powder.
But generally, these are "microparticles", not "nanoparticles", which may react differently in a biological system. Being a magnitude smaller, they will by their nature tend to stay afloat longer. Rather than "clump together" and sink like other particles would.
Here is a study about diamond's biocompatibility.
Their conclusion - "Thus it appears that diamond is extremely -- indeed outstandingly -- biocompatible with living cells."
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Re:When has he been to Mars?
Dammit, you guys, methane is odorless.
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Re:PDFAdobe Acrobat installs a virtual PDF printer so you can create PDFs from any application; and for Word in particular it goes so far as to add an "export to PDF" button right onto the toolbar.
Why would I need to spend money on creating PDFs? I just use Ghostscript.
(I've got the free Adobe Postscript printer driver - so that I can get a good PS file out of OpenOffice.) -
More Links & Information on the Storm...
1. I first found out about the storm on Weather Underground.
2. Dvorak Source
3. CNN's 1st page on it. 4. CNN's follow-up page on it.
*. Hats off to the person that beat me to a first post. ;)
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Chernobyl body count
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Re:Nice...Yeah, he worked for Atari but I'm not going to give his real name as he has chosen not to do so. Any boy detective can find it if they make the slightest effort. I'll even give you a clue. He wrote Super Pac-Man for the Atari 5200 before going on to operating systems. He's mentioned in this article too. Sadly, he's right about TOS, or TOS-off as we disaffectionatelly called it. It sucked. Oh how I wish the Atari ST had shipped with OS 9. If it had, I might still have my hair.
I've been meaning to thank him for his object code converter. I just never thought today would be that day.
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Re:PPC
Just grab a stage 3 tarball from here, for example.
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Re:Why not just use Hydrogen?
Although we think of hydrogen as being flammable in air, this may not be true anymore at 70,000 feet. Flame cannot propagate in very low-pressure gases as explained here.
Keep in mind, also, the Hindenburg did not explode - it burned. There shouldn't have been any oxygen in the envelope, the fire started on the highly flammable fabric skin, and the disaster began when the interior H2 and exterior O2 started mixing.
(I admit I don't know exactly the numbers work out on flammability limits at 70,000 feet. And of course the balloon would still be vulnerable on the way up. But don't dismiss hydrogen out of hand.) -
Electron Band Structure In Germanium, My AssAbstract: The exponential dependence of resistivity on temperature in germanium is found to be a great big lie. My careful theoretical modeling and painstaking experimentation reveal 1) that my equipment is crap, as are all the available texts on the subject and 2) that this whole exercise was a complete waste of my time.
Introduction
Electrons in germanium are confined to well-defined energy bands that are separated by "forbidden regions" of zero charge-carrier density. You can read about it yourself if you want to, although I don't recommend it. You'll have to wade through an obtuse, convoluted discussion about considering an arbitrary number of non-coupled harmonic-oscillator potentials and taking limits and so on. The upshot is that if you heat up a sample of germanium, electrons will jump from a non-conductive energy band to a conductive one, thereby creating a measurable change in resistivity. This relation between temperature and resistivity can be shown to be exponential in certain temperature regimes by waving your hands and chanting "to first order".
Experiment procedure
I sifted through the box of germanium crystals and chose the one that appeared to be the least cracked. Then I soldered wires onto the crystal in the spots shown in figure 2b of Lab Handout 32. Do you have any idea how hard it is to solder wires to germanium? I'll tell you: real goddamn hard. The solder simply won't stick, and you can forget about getting any of the grad students in the solid state labs to help you out. Once the wires were in place, I attached them as appropriate to the second-rate equipment I scavenged from the back of the lab, none of which worked properly. I soon wised up and swiped replacements from the well-stocked research labs. This is how they treat undergrads around here: they give you broken tools and then don't understand why you don't get any results. In order to control the temperature of the germanium, I attached the crystal to a copper rod, the upper end of which was attached to a heating coil and the lower end of which was dipped in a thermos of liquid nitrogen. Midway through the project, the thermos began leaking. That's right: I pay a cool ten grand a quarter to come here, and yet they can't spare the five bucks to ensure that I have a working thermos.
Results
Check this shit out (Fig. 1). That's bonafide, 100%-real data, my friends. I took it myself over the course of two weeks. And this was not a leisurely two weeks, either; I busted my ass day and night in order to provide you with nothing but the best data possible. Now, let's look a bit more closely at this data, remembering that it is absolutely first-rate. Do you see the exponential dependence? I sure don't. I see a bunch of crap. Christ, this was such a waste of my time. Banking on my hopes that whoever grades this will just look at the pictures, I drew an exponential through my noise. I believe the apparent legitimacy is enhanced by the fact that I used a complicated computer program to make the fit. I understand this is the same process by which the top quark was discovered.
Conclusion
Going into physics was the biggest mistake of my life. I should've declared CS. I still wouldn't have any women, but at least I'd be rolling in cash
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Re:Market choice
Yes, I'm a Finale-turned-abc user; most of the typesetting I do is simple lead sheets, and abc on Linux is just superb for this application. I create and modify tunes using Emacs and abc-mode, compile to PostScript using abc2ps (create a keyboard macro that puts abc2ps with desired parameters into the compile command, bind compile to F10 or something and you can quickly recompile your music with one keystroke), and view it with GhostView (set gv to auto redisplay). It is almost as fast and simple as a WYSIWYG music editor such as Finale, WinABC, etc., and in some ways it's better. With these tools I get almost instant visual feedback on my changes but retain the efficiency of simple text entry. The postscript output can easily be ps2pdf'ed for posting or emailing, printouts look superb, and it takes up miniscule amounts of disk space.
After 12 years of Finale typesetting, I've finally found something better and more suitable to my needs. ABC's not for everyone, of course, but the price is right and it's a great fit for people who are comfortable with command lines and just need simple lead sheets. -
Re:The World evolves around Office, pass it on.
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Postscript fonts
The embedded Postscript fonts don't have to look bad. I advise using GhostScript to view PS and PDF files, since it makes the fonts look nice on the screen. If you use Linux, chances are you already have this installed.
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Clickable Links
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Re:Acrobat is Your Friend!
Why use the Adobe product to create PDFs anyway? Ghostscript works for me.
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Re:Fixing Opportunity after the fact
You wouldn't by any chance be one of those whack-job Nader supporters, would you?
It amazes me how many people think Plutonium is going to kill people. It's an Alpha emitter for crying out loud. That means that you can hold it in your hand and none of the radiation will penetrate your skin. If I were you, I'd be much more worried about the Uranium, Thorium, Arsenic, Mercury and other chemicals (many radioactive) that are released by coal plants. Not to mention that rockets are composed of many chemicals which are far more dangerous than Plutonium.
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Re:Idiot.Well, I'm sure there's no RFID tag in 20 dollar bills but there definitely is a metal strip on them and that's enough to explain why they would burn in a microwave.
You've probably heard of microwaving CDs. The metal layer on CDs is very thin, after all you can see through it, yet it makes a very impressive display and it obviously melts and burns the plastic.
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Rocks - Disruption proofing for TCP
This is an excellent user land TCP application that automatically re-connects to dropped TCP connections, even if the IP addresses change.
http://www.cs.wisc.edu/~zandy/rocks
There is also an in-depth paper by the authors.
Rocks protect sockets-based applications from network failures, particularly failures common to mobile computing, including:
* Link failures (e.g., unexpected modem disconnection);
* IP address changes (e.g., laptop movement, DHCP lease expiry);
* Extended periods of disconnection (e.g., laptop suspension).
Rock-enabled programs continue to run after any of these events; their broken connections recover automatically, without loss of in-flight data, when connectivity returns. Rocks work transparently with most applications, including SSH clients, X-windows applications, and network service daemons.
bah, slashcode breaks the title attribute in hrefs and co-opts it for it's own use, bad programming.
It is helpful to blind readers and page indexers esp. if the label text is something like 'click here' to provide some information on the content of the link. grr sometimes I gets so mads -
Rocks - Disruption proofing for TCP
This is an excellent user land TCP application that automatically re-connects to dropped TCP connections, even if the IP addresses change.
http://www.cs.wisc.edu/~zandy/rocks
There is also an in-depth paper by the authors.
Rocks protect sockets-based applications from network failures, particularly failures common to mobile computing, including:
* Link failures (e.g., unexpected modem disconnection);
* IP address changes (e.g., laptop movement, DHCP lease expiry);
* Extended periods of disconnection (e.g., laptop suspension).
Rock-enabled programs continue to run after any of these events; their broken connections recover automatically, without loss of in-flight data, when connectivity returns. Rocks work transparently with most applications, including SSH clients, X-windows applications, and network service daemons.
bah, slashcode breaks the title attribute in hrefs and co-opts it for it's own use, bad programming.
It is helpful to blind readers and page indexers esp. if the label text is something like 'click here' to provide some information on the content of the link. grr sometimes I gets so mads -
Re:Not a bad forgery.....
Yeah, I've noticed that too. You have my respect for being polite and not replying with anything harsher than putting me on a foe list.
:)
Politically our views are different, but I can understand your views. I can't agree with them though. I value human lives of people about the same, regardless of their nationality. You, apparently value American lives at least 100 times more than the lives of the foreigners (see the VC/US casualties). To me this is quite repulsive, but I can understand why you think so.
As for my insults, there are a few reasons:
- semi-anonymous forums tend to let people behave more openly. I would definitely be polite to you in person
- closely linked to that is the fact that insulting other people can be lots of fun sometimes and can lead to exciting flamewars. Unfortunately, it doesn't work when the other side refuses to participate, by being polite like you were. No fun for me. :(
- even though your Slashdot user identity (i.e. that part of you that I have direct communication with) was/is quite rational, polite and possibly smart, I tend to generally view most of religious people as stupid.
- I don't think that everyone who disagrees with me is always evil/stupid. However, in some cases I actually am so sure to think in such way. Some examples are religion, UFO, evolution, dinasaurs, Moon landing, etc. Again, I might be wrong in a handful of cases and a few people holding opposing beliefs might be genuinly smart, but misled only in this particular case. But from the game theory point it is worth to presume they are idiots and act accordingly.
- as for persuading, I know that most people can't be persuaded, because they have serious reasoning problems and are generally stupid. Whether this is the case for you, I don't know, but the optimal strategy is to presume it is so at the slightest suspicon.
As one so eloquently put it "While you may on rare occasion fail to give a fair shake to one who deserves it, you free up years of your life that would otherwise be wasted on imbeciles."
Please, tell me, what are the chances (realistically) that I can, by being polite and presenting the most strongest arguments, persuade you that your so-called Lord doesn't exist (and never did) and killing Vietnamese people was wrong and the soldiers fought for the unjust cause? I tend to lean to the opinion that in order to safely harbour the religion and shauvinism memes you need to be able to easily ignore strong arguments. -
Re:Here's all he actually says
I feel exactly the same way. I gave up and used LPRng instead, but I still have not got postscript printing working properly with one printer.
try apsfilter Needs a2ps & psutils, can work w/ both flavors of ghostscript (afpl and gnu), and use's the os native lpr(ng). Hell of alot less frustration involved.
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Re:Oh, boy!
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Re:Maybe I shouldn't go back to Oregon...
Google for the humongous fungus
Here's one story. It is big, and it doesn't move. -
Re:What the fuck?
For the academic slant: Fuzz testing of application reliability. It's amazing how many tools fail the random input test.
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Re:Not now.....
Plutonium - Pu 239 has a half-life of 24,000 years. A piece of plutonium feels warm since it actually generates heat by nuclear reactions.
Get your facts straight, will you? Plutonium-239 will not boil water. Plutonium-238 on the other hand, has a half life of 87 years and is hot enough to produce energy for deep space probes. Both are Alpha emitters and do not pose a health risk as long as they aren't inhaled. (Pretty damn hard when you consider that the stuff is... well... pretty damn hard.)
Radium - a extremely radioactive element. It has a half-life of around 1600 years...
Thrilling. Radium is only dangerous if you digest the stuff. And even then it's not guaranteed to kill you. It just increases your risk of cancer.
And all this stuff is lethal at extremely low quantities!
Better run chicken little! Meteorites burning up in the Earth's atmosphere are dropping the highly poisonous (and radioactive) substance "Uranium" on your head! The sky is falling, the sky is falling!
Sheesh.Almost as bad as that pansy ass, Ralph Nader.
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Re:Not now.....
Plutonium - Pu 239 has a half-life of 24,000 years. A piece of plutonium feels warm since it actually generates heat by nuclear reactions.
Get your facts straight, will you? Plutonium-239 will not boil water. Plutonium-238 on the other hand, has a half life of 87 years and is hot enough to produce energy for deep space probes. Both are Alpha emitters and do not pose a health risk as long as they aren't inhaled. (Pretty damn hard when you consider that the stuff is... well... pretty damn hard.)
Radium - a extremely radioactive element. It has a half-life of around 1600 years...
Thrilling. Radium is only dangerous if you digest the stuff. And even then it's not guaranteed to kill you. It just increases your risk of cancer.
And all this stuff is lethal at extremely low quantities!
Better run chicken little! Meteorites burning up in the Earth's atmosphere are dropping the highly poisonous (and radioactive) substance "Uranium" on your head! The sky is falling, the sky is falling!
Sheesh.Almost as bad as that pansy ass, Ralph Nader.
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Re:Not now.....
I know they've made major improvements in fission reactors. Unfortunately some of the improvements were due to be brought forth about the time the Three Mile Island fiasco happened, which pretty much killed nulear energy in the US.
The ironic part is that TMI worked exactly as it was supposed to. It shut down, and that was that. When talking about high energy densities like nuclear, there's no such thing as too safe. But to penalize a system for working right? That's just wrong.
As for the other stuff you claim about a small amount of waste, you either know more about it than I do or you're pulling it out of your ass. I'll give you the benefit of doubt and assume the former :-)
Why thank you. :-) I'm too tired to pull up a bunch of links, but here's bunch of stuff for you to research:
- "Breeder" reactors are used in Europe. They reprocess the "waste" into hotter radioisotopes that can be reused. They were outlawed in the US for fear that they would make it easier for terrorists to obtain fissionable materials.
- Uranium is one of the most common substances on Earth.
- Coal burning throws out tons of uranium into the atmosphere every year.
- Coal burning kills thousands every year. In 1952, 3500 London residents were killed by a coal plant in one week.
Did I forget anything? Oh yeah, Plutonium is an alpha emitter. For the most part, the radiation can't penetrate your skin. Still, Ralph Nader is a pansy ass when it comes to the stuff.
I think in this day and age where everyone is worried (justly or not) about terrorism and dirty bombs, vastly increasing the amount of fissionable material circulating "out in the wild" to power these reactors isn't going to happen anytime soon.
Dirty bombs are a dud. Nearly all the radiation from the blast would be shielded by the common building materials used today. It might increase the death rate near the blast, but it certainly wouldn't do much to make a city uninhabitable.
Speaking of fissionable material, I remember hearing once that there is only about a 10 or 20 year supply of fissionable uranium available if we were to start using it as a primary energy source.
Bah. Probably existing energy companies trying to scare people. Uranium is tremendously common and has been dropping in price. Most Uranium used today is coming from mines in Canada. As I said, I'm pretty tired so you'll have to do some digging for yourself. Check Wikipedia for a good overview.
For that matter, I remember all those environmental doomsday things they used to make us read in school in the 70's said we were supposed to be out of oil sometime in the 90's (and New York City was supposed to be 10 feet under water because of the melted ice caps), so I sort of doubt those kinds of long term predictions anyway.
Good lad. Don't believe everything you hear. Yes, fossil fuels are a problem. But they aren't quite exhausted yet. When they are, they'll be supplanted by a new technology. Nuclear seems to be the best way to build the necessary infrastructure for a chemical energy storage technology.
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Re:Making ethanol uses fossil fuels
It may well be better to cut the corn like you would for silage and use the entire plant for mash, then use the increased energy production to heat to mix. I'm just speculating though, I haven't fact one to back up that guess
I may not know much about growing grain, but I do know a thing or three about fermenting it
:-) As an educated guess, I'm going to say that corn cobs, leaves, and stalks are going to have about as much sugar content as a pile of lawn clippings. Lawn clippings are not noted for thier fermentability :-) My guess is that chopping it into silage is going to be a waste of energy. You might be able to extract methanol from the stalks via destructive distillation but this would not give you a positive energy yield unless you're using solar power to do it. Your best bet is probably to sun-dry the waste and burn it to fuel the mashing and distallation processes.So, now the question is, how much alcohol can we get out of a bushel of corn. I've never brewed with corn, but I'll assume it's going to work about the same way as brewing with barley.
The first step is to malt the grain -- allow it to start to germinate and then dry it out. We'll assume that the energy cost for malting is negligible since we'll be using sun-drying. The germination process releases enzymes which starts to break the unfermentable starches down into fermentable sugars. Once we have our malt we crush it in a mill. You're going to need some energy to run the mill, but not a huge amount. Since what we need is kinetic energy, we can power the mill the old-fashioned way: with wind or water.
A quick search of the net shows that a bushel of corn weighs 47 lbs. To make mash, we have to add (room-temperature) grain to hot (but not boiling) water, so we'll either need a solar hot water heater or we'll need to burn some of our dried waste. Cooking the mash is going to require several stages of heating & cooling in order to extract and convert as much of the starch & sugar as possible, so we're going to need an energy source for this too, but to make it easy let's say we'll need to hold the mash at an average of 150F for 4 hours. We're going to lose about 2 gallons of our mash (evaporation and absorption by the grain), but then add in about another 6 to rinse (sparge) the spent grain hulls, so our final product here is going to be about 16 gallons of raw wort. Since we don't care what it tastes like, we can skip some steps and save some energy, but still the mashing process is fairly energy intensive.
We pitch some yeast into our 16 gallons of wart and let it do it's thing. Let's assume that our final product after fermentation is going to be 14 gallons (after losses for sediment & evaporation) at a concentration of 8% alcohol. We'll have to boil all this liquid off in our still -- very expensive energy-wise. If we figure we want our end product at 160 proof (80% alcohol), our maximum theoretical yield is going to be 1.4 gallons per bushel; real-world yield would probably be closer to 1.3. I could be way off on my calculations, but I'd bet even money that you'll get at least 1 gallon per bushel.
So, given these (admittedly rough) calculations, at 125 bu/acre yield of corn, we'll be able to produce about 163 gallons of alcohol per acre. If we assume alcohol is 2/3 as efficient as diesel, given your figures we'll need at least 10 gallons of alcohol per acre to run the tractor -- call it 13, so our net yield is 150 gallons. To produce this we'll have had to have vaporized about 1,800 gallons (6800 litres) of water. Since vaporizing water takes 2260 Joules/gram (2.2 MJoules/litre), we've expended about 15,000 megajoules of energy just in the mashing and distallation processes to produce 150 gallons of usable fuel; this gives us 100 MJou
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Re:I for one...It's a common misconception that stem cells are harvested from aborted fetuses. By making it look like there are these mad scientists harvesting cells from aborted fetuses the people against the research make it look more disturbing.
Go here for more info on how we really get stem cells. For those who do not want to read here's a little blurb:Where do embryonic stem cells come from?
Human embryonic stem cells are derived from fertilized embryos less than a week old. Using 14 blastocysts obtained from donated, surplus embryos produced by in vitro fertilization, a group of UW-Madison developmental biologists led by James Thomson established five independent stem cell lines in November 1998. This was the first time human embryonic stem cells had been successfully isolated and cultured.
The cell lines were capable of prolonged, undifferentiated proliferation in culture and yet maintained the ability to develop into a variety of specific cell types, including neural, gut, muscle, bone and cartilage cells.
The embryos used in the work at UW-Madison were originally produced to treat infertility and were donated specially for this project with the informed consent of donor couples who no longer wanted the embryos for implantation. -
Cloning for stem cells is dumb
We already have stem cell lines that are actively being cultivated. By cloning to get stem cells you just get all the religious zealots even more worked up. Use the cell lines that are there instead of creating more and the great research that is being done can continue without people freaking out about it.
More info on stem cells -
Re:Simple doesn't mean easy
Actually, at UW Madison there is a freshman course titled Physics 247. In it you cover special relativity and become rather competent in utilizing it. In Physics 248, another course you can take as a freshman you get a general feel for general relativity, but at a very babyish level. You do however learn about QM, this Friday (or next week depending) we will write out the Schrodinger Equation. Again, both of these courses can be taken at a freshman level.
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Re:Simple doesn't mean easy
Actually, at UW Madison there is a freshman course titled Physics 247. In it you cover special relativity and become rather competent in utilizing it. In Physics 248, another course you can take as a freshman you get a general feel for general relativity, but at a very babyish level. You do however learn about QM, this Friday (or next week depending) we will write out the Schrodinger Equation. Again, both of these courses can be taken at a freshman level.
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University of Wisconsin
The Computer Science department is consistently ranked as one of the top 10 in the United States, and also ranks in the top 10 in several specific CS graduate areas. The department and its faculty and staff are the recipients of numerous honors and awards. The CS department has a wide variety of research areas, including computer networking, and operates the Wisconsin Advanced Internet Laboratory (WAIL), a one of a kind laboratory for network testing and research.
The University of Wisconsin itself is a premier public research University with a yearly budget of $1.7 billion. It ranks number 2 in research spending (and number 1 among public universities), number 2 in number of research doctorates granted, 16 of 39 major academic programs ranked in the NRC top 10, and 35 of 39 major academic programs ranked in the NRC top 25.
There are so many top notch faculty, staff, and students here at the tops of so many fields that it's amazing, from bioinformatics to nuclear engineering, from music to Slavic languages, from space physics to medical physics (including the only freestanding medical physics department in the United States), from medicine (and 3 affiliated hospitals) to literature. The University has a significant commitment to research, expanding and improving its infrastructure, and is continuously embarking on major new building inititives. The city of Madison itself is also a wonderful place to live. -
University of Wisconsin
The Computer Science department is consistently ranked as one of the top 10 in the United States, and also ranks in the top 10 in several specific CS graduate areas. The department and its faculty and staff are the recipients of numerous honors and awards. The CS department has a wide variety of research areas, including computer networking, and operates the Wisconsin Advanced Internet Laboratory (WAIL), a one of a kind laboratory for network testing and research.
The University of Wisconsin itself is a premier public research University with a yearly budget of $1.7 billion. It ranks number 2 in research spending (and number 1 among public universities), number 2 in number of research doctorates granted, 16 of 39 major academic programs ranked in the NRC top 10, and 35 of 39 major academic programs ranked in the NRC top 25.
There are so many top notch faculty, staff, and students here at the tops of so many fields that it's amazing, from bioinformatics to nuclear engineering, from music to Slavic languages, from space physics to medical physics (including the only freestanding medical physics department in the United States), from medicine (and 3 affiliated hospitals) to literature. The University has a significant commitment to research, expanding and improving its infrastructure, and is continuously embarking on major new building inititives. The city of Madison itself is also a wonderful place to live. -
University of Wisconsin
The Computer Science department is consistently ranked as one of the top 10 in the United States, and also ranks in the top 10 in several specific CS graduate areas. The department and its faculty and staff are the recipients of numerous honors and awards. The CS department has a wide variety of research areas, including computer networking, and operates the Wisconsin Advanced Internet Laboratory (WAIL), a one of a kind laboratory for network testing and research.
The University of Wisconsin itself is a premier public research University with a yearly budget of $1.7 billion. It ranks number 2 in research spending (and number 1 among public universities), number 2 in number of research doctorates granted, 16 of 39 major academic programs ranked in the NRC top 10, and 35 of 39 major academic programs ranked in the NRC top 25.
There are so many top notch faculty, staff, and students here at the tops of so many fields that it's amazing, from bioinformatics to nuclear engineering, from music to Slavic languages, from space physics to medical physics (including the only freestanding medical physics department in the United States), from medicine (and 3 affiliated hospitals) to literature. The University has a significant commitment to research, expanding and improving its infrastructure, and is continuously embarking on major new building inititives. The city of Madison itself is also a wonderful place to live.