some plants grow really well when exposed to blue/red light combination from LEDs in a closed room. also, way cheaper and more unobtrusive than using incandescent lamps. (disclaimer for the well-informed slashdotters, i grow hot peppers for my pizzas).
Yep, you're welcome to come to my small ranch any day of the week. Pigs, goats, vegetables, grapes, various fruits, tasty cheese - and you only farm from dawn to dusk, after dark we have a party by the fire, and, if it is clear, some abuse of my telescopes. You coming?
Well, I am a bit older than that, and I was so overwhelmed by the speeds of modern computers, that I switched to programming microcontrollers for fun. With chips running at few MHz, having just a few kb of ram and 9600 bps available to talk to them, I feel right at home, and comfortable.;)
well, the moderated and narrow interest groups on the usenet were quite useful most of the time, much more so than twitter.
to me, twitter is kinda like the rss of wsj - lots of headlines, no content.
if you're just looking at it seems like a lot, but if you dig in, you realize 70% is junk you don't want to know about, 29% is a repeat with a slightly changed headline, and the rest is so rare it almost doesn't pay to have it.
Nope it isn't, not for "normal" mirrors anyway. Monolithic mirrors are made of uniform piece of material, properly annealed for stress. After polishing, the mirrors are mounted on a specialised structures, called mirror cells. These are designed with the assumption above, and with the goal of making the mirror behave as if it was floating freely.
Adding of a bowl or a frame between the reflecting surface and the mirror cell (which you imply) will induce stress and cause severe astigmatism in the mirror. This is only done in cheap mass-produced Chinese telescopes where they just glue the 6 inch mirror to the bottom.
Here's the ESO setup -- http://www.eso.org/public/images/eso9940b/ - you can see for yourself that the mirror is made from one block of zerodur, there is no supporting "bowl" or "frame" between the mirror and the cell.
Actually, most telescope mirrors are made from glass (some are made of special glasses, that have low thermal expansion and so on, but nevertheless glass), glass being the important "ingredient" of the mirror. The reason is that glass has no crystal structure and can be polished to very high degree of accuracy and achieve the required figure (a paraboloid) with very high precision. Glass is also a very stable medium if prepared (annealed) properly.
Since the purpose of an astronomical mirror is to collect light in a precise way, the figure of the mirror is of most importance. The role of the metal layer on the surface is only to increase the reflectivity of the glass. There were (and, for some specialized uses probably are) some metal astronomical mirrors (made of speculum metal, mostly before glass got into wide use) but they allow a figure that is no better than the glass ones, and are difficult to polish and maintain.
In fact, metal coating isn't even necessary to use a glass mirror. When you make a telescope mirror, before you send it off for coating you'd perform what is known as "star tests". You'd set up your telescope, put in the uncoated mirror in it, and look at stars to see if the mirror shape is good. I could easily see a lot of planetary detail with my last (40") mirror while I was testing it without coating. Looking at the Moon was blinding.
Probably becaue you lose the biggest advantage of the "liquid mirror". With a liquid, you can make a very large, very thin spinning surface which will keep its perfect shape because of the motion. Now, freeze that, peel it off --- how do you keep the shape? If it is thick, it will pose the same problems as any large mirror - heavy, unwieldy, needs lots of time to come to equilibrium with the environment, etc. If it is thin - keeping the shape is probably hopeless.
Even if you could keep the shape somehow, freezing isn't a uniform process. As the temperature is lowered, crystals, lumps and whatnot starts forming in the melt. Some of these will inevitably go to the surface and spoil the figure of the resulting surface. And we're talking really, really small lumps here - on the order of less than quarter of the lightwave the surface is supposed to reflect. So, you'll need to work on the surface afterwards, just the same way you'd work on a surface of a "normal" mirror.
I am not sure enough effort will be saved by making the initial figure in this way vs. the traditional methods of preparing a surface for polishing to justify the spinning. Speaking from experience, "pregrinding" a piece of glass to a rough sphere with a piece of pipe (or, if you're hi-tech, a diamond saw) does a good enough job. And the professional mirror makers have more than that at their disposal.
Knuth's analysis is valid in the framework of his assumptions, and what is described in the linked article has been known as "cache oblivious b-tree" for not so short time.
Hitler did not become a Chancellor by a proper constitutional process; he and his party never had support even close to the numbers needed. He got himself in power by back-room dealing, subverting the democratic process, not using it.
What he did then is to use the Reichstag fire to get emergency powers (again, distancing himself from the democratic principles of the constitution); to use the state apparatus to win a larger vote; and to use his private army to force the (new) parliament to let him dispense with what was left of the democratic institutions after the Enablement act.
Calling this a "democratic" process is okay if you accept that countries like Nicaragua, Cuba or Chile in the 70s were "democratic".
So, the idea that Hitler was "democratically" elected is not even close to the truth.
Also, I see some above question the role of the nazis in the engineering of the fire, but if one follows the proceedings of the trials, especially the mountain of evidence of the fire, it is quite obvious.
An informative article on the subject of the fire is available here. Unfortunately, my other sources are mostly on paper, and out of reach at the moment.
And Hitler was elected in democratic elections as well.
No, he wasn't, stop spreading that BS please. Hitler was appointed by Hindenburg, then engineered the Reichstag fire, then enacted draconian laws on grounds of security, used that to rig the next election, which still didn't bring him majority. He then forced Hindenburg out, forced the new Reichstag into giving him legislative powers, effectively suspended the constitution, and then proceeded on to murder his opposition in and outside of his party, and, finally, using the "emergency" legislative powers to declare himself a Furher. Or somesuch. But he was never elected at any point of his national political career by a majority.
the information could most certainly be used to... temporarily stunt or even cripple entire economies.
Well, information is being used in this way right now, and has been used like that for decades, except the people who're using it aren't cyber this or that, but plain and simple fund and bank managers. Spies, hackers and what not cannot come close to the level of damage these people are doing, and yet it is legal, encouraged and awarded.
You eat, or you get eaten, etc. Will get even worse as Europe goes bankrupt, and the US brings about the next big war. Give it another 20 months, give or take, and you'll see.
Yep, and the biggest optimist is the idiot prime minister. With the Japanese government kinda broke, the "alien" Hatoyama and his cabinet gone in a day or two, and his (well, his master's) party to be thrashed and obliterated in the coming elections, I am not sure this project has a bright future. Which is probably a pity.
don't necessarily represent ideas or words, they actually represent sounds and are used like your alphabet is (see e.g. http://www.omniglot.com/writing/egyptian.htm). now, if those user-created symbols would function like pictograms, not dissimilar to the traditional chinesich characters we love and cherish, it'd be a totally different matter.</nitpick>
It is very heartwarming to see the stories I grew up with behind the Iron curtain about CIA agents coming in to ruin our happy socialist lives being rehashed on what used to be the "free" side of the said curtain:)
Slashdot Mirror
some plants grow really well when exposed to blue/red light combination from LEDs in a closed room. also, way cheaper and more unobtrusive than using incandescent lamps. (disclaimer for the well-informed slashdotters, i grow hot peppers for my pizzas).
yep, there is also the kind that comes with old lace. of course, that was fashionable before polonium become commonplace.
1) Can I farm till 3am?
Yep, you're welcome to come to my small ranch any day of the week. Pigs, goats, vegetables, grapes, various fruits, tasty cheese - and you only farm from dawn to dusk, after dark we have a party by the fire, and, if it is clear, some abuse of my telescopes. You coming?
I'm using Vimperator, you insensitive clod!
Well, I am a bit older than that, and I was so overwhelmed by the speeds of modern computers, that I switched to programming microcontrollers for fun. With chips running at few MHz, having just a few kb of ram and 9600 bps available to talk to them, I feel right at home, and comfortable. ;)
well, the moderated and narrow interest groups on the usenet were quite useful most of the time, much more so than twitter.
to me, twitter is kinda like the rss of wsj - lots of headlines, no content.
if you're just looking at it seems like a lot, but if you dig in, you realize 70% is junk you don't want to know about, 29% is a repeat with a slightly changed headline, and the rest is so rare it almost doesn't pay to have it.
the authors analyzed the content of tweets during a recent World Cup game, finding 76% of them to be useless
so, they found 24% useful comments? for what i've seen of twitter it seems like an excellent content ratio.
That’s already how it’s done.
Nope it isn't, not for "normal" mirrors anyway. Monolithic mirrors are made of uniform piece of material, properly annealed for stress. After polishing, the mirrors are mounted on a specialised structures, called mirror cells. These are designed with the assumption above, and with the goal of making the mirror behave as if it was floating freely.
Adding of a bowl or a frame between the reflecting surface and the mirror cell (which you imply) will induce stress and cause severe astigmatism in the mirror. This is only done in cheap mass-produced Chinese telescopes where they just glue the 6 inch mirror to the bottom.
Here's the ESO setup -- http://www.eso.org/public/images/eso9940b/ - you can see for yourself that the mirror is made from one block of zerodur, there is no supporting "bowl" or "frame" between the mirror and the cell.
Actually, most telescope mirrors are made from glass (some are made of special glasses, that have low thermal expansion and so on, but nevertheless glass), glass being the important "ingredient" of the mirror. The reason is that glass has no crystal structure and can be polished to very high degree of accuracy and achieve the required figure (a paraboloid) with very high precision. Glass is also a very stable medium if prepared (annealed) properly.
Since the purpose of an astronomical mirror is to collect light in a precise way, the figure of the mirror is of most importance. The role of the metal layer on the surface is only to increase the reflectivity of the glass. There were (and, for some specialized uses probably are) some metal astronomical mirrors (made of speculum metal, mostly before glass got into wide use) but they allow a figure that is no better than the glass ones, and are difficult to polish and maintain.
In fact, metal coating isn't even necessary to use a glass mirror. When you make a telescope mirror, before you send it off for coating you'd perform what is known as "star tests". You'd set up your telescope, put in the uncoated mirror in it, and look at stars to see if the mirror shape is good. I could easily see a lot of planetary detail with my last (40") mirror while I was testing it without coating. Looking at the Moon was blinding.
Probably becaue you lose the biggest advantage of the "liquid mirror". With a liquid, you can make a very large, very thin spinning surface which will keep its perfect shape because of the motion. Now, freeze that, peel it off --- how do you keep the shape? If it is thick, it will pose the same problems as any large mirror - heavy, unwieldy, needs lots of time to come to equilibrium with the environment, etc. If it is thin - keeping the shape is probably hopeless.
Even if you could keep the shape somehow, freezing isn't a uniform process. As the temperature is lowered, crystals, lumps and whatnot starts forming in the melt. Some of these will inevitably go to the surface and spoil the figure of the resulting surface. And we're talking really, really small lumps here - on the order of less than quarter of the lightwave the surface is supposed to reflect. So, you'll need to work on the surface afterwards, just the same way you'd work on a surface of a "normal" mirror.
I am not sure enough effort will be saved by making the initial figure in this way vs. the traditional methods of preparing a surface for polishing to justify the spinning. Speaking from experience, "pregrinding" a piece of glass to a rough sphere with a piece of pipe (or, if you're hi-tech, a diamond saw) does a good enough job. And the professional mirror makers have more than that at their disposal.
Knuth's analysis is valid in the framework of his assumptions, and what is described in the linked article has been known as "cache oblivious b-tree" for not so short time.
Hitler did not become a Chancellor by a proper constitutional process; he and his party never had support even close to the numbers needed. He got himself in power by back-room dealing, subverting the democratic process, not using it.
What he did then is to use the Reichstag fire to get emergency powers (again, distancing himself from the democratic principles of the constitution); to use the state apparatus to win a larger vote; and to use his private army to force the (new) parliament to let him dispense with what was left of the democratic institutions after the Enablement act.
Calling this a "democratic" process is okay if you accept that countries like Nicaragua, Cuba or Chile in the 70s were "democratic".
So, the idea that Hitler was "democratically" elected is not even close to the truth.
Also, I see some above question the role of the nazis in the engineering of the fire, but if one follows the proceedings of the trials, especially the mountain of evidence of the fire, it is quite obvious.
An informative article on the subject of the fire is available here. Unfortunately, my other sources are mostly on paper, and out of reach at the moment.
He was elected by a plurality, at least, with his party garnering (if I recall correctly) about 44% of the votes
Nope, he got 44% post-reichstag, with the new, dictatorial laws already in place. go look it up.
or, put it another way, your facts are off.
And I hope I am not close to a road on that day too.
And Hitler was elected in democratic elections as well.
No, he wasn't, stop spreading that BS please. Hitler was appointed by Hindenburg, then engineered the Reichstag fire, then enacted draconian laws on grounds of security, used that to rig the next election, which still didn't bring him majority. He then forced Hindenburg out, forced the new Reichstag into giving him legislative powers, effectively suspended the constitution, and then proceeded on to murder his opposition in and outside of his party, and, finally, using the "emergency" legislative powers to declare himself a Furher. Or somesuch. But he was never elected at any point of his national political career by a majority.
actually, every law should have a mandatory expiry date.
And now it turns out they are just some bored trololists who moved form Mom's basement to Pentagon's basement. Quite a letdown, no?
the information could most certainly be used to ... temporarily stunt or even cripple entire economies.
Well, information is being used in this way right now, and has been used like that for decades, except the people who're using it aren't cyber this or that, but plain and simple fund and bank managers. Spies, hackers and what not cannot come close to the level of damage these people are doing, and yet it is legal, encouraged and awarded.
And the world is still spinning ;)
http://www.whale.to/b/england.html
You eat, or you get eaten, etc. Will get even worse as Europe goes bankrupt, and the US brings about the next big war. Give it another 20 months, give or take, and you'll see.
Yep, and the biggest optimist is the idiot prime minister. With the Japanese government kinda broke, the "alien" Hatoyama and his cabinet gone in a day or two, and his (well, his master's) party to be thrashed and obliterated in the coming elections, I am not sure this project has a bright future. Which is probably a pity.
don't necessarily represent ideas or words, they actually represent sounds and are used like your alphabet is (see e.g. http://www.omniglot.com/writing/egyptian.htm). now, if those user-created symbols would function like pictograms, not dissimilar to the traditional chinesich characters we love and cherish, it'd be a totally different matter.</nitpick>
It is very heartwarming to see the stories I grew up with behind the Iron curtain about CIA agents coming in to ruin our happy socialist lives being rehashed on what used to be the "free" side of the said curtain :)
That's not the American way, that's the responsible way.
the cloud is secure. it is the dev workstations that are in danger :)