Man, you ever try to keep up with a tachyon? I swear those things go at least 10,000,000 miles a minute- must be the drugs. They are like "Speed" on crack.
Where did you get string theory out of that article? It never mentioned it at all. And interference patterns don't need string theory to be explained. String theory is more useful to explain things like what the universe was like close to the Big Bang, why gravity is weak, why the universe is expanding at an accelerating rate, yada yada.
Anti-matter exists. It can be detected and observed. "Shadow protons" has nothing to do with the article- it was photons, not protons, and those two things cannot possibly be more different. Shadow photons have a much better name- virtual photons, and they are already used in theory. And they are just that- a theoretical convenience. They don't really "exist" in the sense that other matter (or anti-matter, no real difference there) does. In short, this paper doesn't really seem to say anything new, though apparently the author thinks it does.
This is because what is reaching the last filter in the second case does not have the same polarization that it had in the first case.
After passing through the first filter the light has been polarized in some direction- all of the perpendicular components have been removed by the filter.
In the first case, there is only one other filter, oriented at 90 to the first one. This will only allow the components of light polarized 90 to the first screen's orientation to pass. But all of those components were removed, so nothing gets thru.
In the second case, your filter is not oriented at 90, but at 45 to the first filter. Hence it will only components of light at 45 to the first filter's orientation to pass. But using vector analysis, we can break that orientation up into two vector components (that match up with the orientations of the first and third screens), and see that some light will get thru. How much? Well, cosine of 45 is 1/sqrt[2], and the intensity of the transmitted light goes as the square of that, so 1/2 of the light coming from the first filter gets through the 2nd filter.
Also, 1/2 of the original light went thru the first filter- this assumes a random distribution of polarizations of incoming light, i.e. unpolarized light.
Since the third filter is oriented at 45 to the second, we get another factor of 1/2. Totaling up all 3, we get 1/8 of the original intensity. I hope this makes sense. It probably won't unless you are comfortable with vectors.
Mod this up. I was going to say something to the same effect, but I was afraid to use the phrase "wave packet". This is an excellent description of how the overwhelming majority of physicists view this phenomenon.
And by old, bravehamster means OLD. Like over 200 years old. See this link for more details on Young's double slit experiment.
Basically, light behaves as a wave, and since waves can constructively and destructively interfere with one another (cast two stones simultaneously in a pond and oberve the resulting interference pattern) light will form a funny looking pattern that one would not intuitively expect on a screen some distance from the slit.
I've always thought that life would probably require a heady number of different chemical elements, thus we would find it in areas of the universe with an abudance of heavy elements (like gold, lead, etc.). My guess would be that this solar system is probably a 2nd or 3rd generation system meeting those requirements- 7-10 billion years ago there probably was not nearly as many star systems with the abundance of transistion metals that we have here. And I think those are just as necessary for "complex" life as the basic carbon, oxygen, hydrogen, etc. are for life was we know it.
I was a physics undergrad at Case, and actually had Starkman as a professor for a mathematical physics course. I have chatted with Krauss a few times since graduation on science topics involving public education. These are good guys, glad to see them headlining slashdot this morning.
A solenoid is just a coil of wire. It produces a magnetic field inside the coil. This field can be made to change strength and direction by altering the flow of current in the wire. This field can result in a force that will accordingly push or pull magnetic materials. Unfortunately, most materials won't really react to this field, so I am guessing something ferromagnetic is coupled to any moving bits if solenoids are used.
Did anybody notice that if the 1:15 million scale quoted in the Slashdot article is correct that 10 scale miles is 150 million miles? The average distance from the Earth to the Sun is roughly 93 million miles, so 150 million is a about 50% too high. Which is wrong, the scale provided or the scale distance quoted?
I have read I, Robot a few times (the most recent was several years ago), and I cannot recall any type of story like this. It seems to me that the screenplay is not based on any Asimov story as much as it uses his 3 Laws of Robotics as a plot device. So if you were thinking it was anything like the stories in I, Robot, this is not it. In the book, robots slowly progress from primitive models to one that is virtually indistinguishable from humans and becomes a powerful politician. That doesn't look to be happening in the movie (then again, we probably could have figured that out when Will Smith signed on).
Does this remind anyone of Fahrenheit 451 at all? The houses in the book had walls that were actually like TV's. I can imagine an array of LCD panels that are backlit via this type of technology being used as a wall TV. Imagine [insert FPS of your choice] on a small wall, say 15'x10'...
This is because of the heat distribution in your pot. I don't cook rice how you described, but one thing that might help you is to buy one of those heat distributors.
Basically, it is a round piece of metal with holes in it, and a handle on the side. You stick it under your pot to keep the bottom from getting so much warmer than the rest of the pot. Works great on both gas and electric. It's about 1/2" thick, and not expensive, unfortunately, I don't know its real name.
Yes and no. In reality what is happening when one is in orbit around an object is that one is falling about it at the exact same rate as one's spaceship. Thus, because both the ship and the observer are in the same frame of reference (even though that frame is accelerating in the planet's frame) the observer feels weightless because his reference tells him he is not accelerating with respect to his frame (not just zero net acceleration!).
Sure being in a gravitational field could have different effects at a quantum level- if you had an interaction potential that was gravity dependent, this would change the eigenvalues of Schrodinger's equation. It's kind of like the broken degeneracy in the Zeeman effect.
Can gravity affect the other four forces? Not really, no more than the electric interaction 'affects' the weak interaction or the strong nuclear interaction.
Actually, in a sense, it was Bush. Bush the Elder that is. Though it was a Democratic Congress at the time that actually killed the bill if I remember correctly.
When I was an undergrad, I spent a summer in a lab where I cleaned out a furnace used to make Gallium Arsenide crystals. Basically they'd put in a lump of gallium and some aresenic powder, heat it up at high pressure till it liquified, and then slowly pull a crystal out of the melt.
Well, after this was done, and the furnace was opened, there would be a bunch of plated arsenic on the inside of the furnace. This would interfere with the next crystal growth run, so it had to be removed. I'd get suited up in a bunny suit, wear two or three layers of gloves, a heavy duty respirator, and Tyvek booties to clean this thing using a metal scrub brush. I'd spend 6 hours in this suit, which was boiling hot since it didn't breathe at all, the whole time contorted in weird positions to get at the inner surface of the furnace with my brush.
By the time I was done, my muscles were sore, I was extremely hot, and there was arsenic everywhere. No matter how hard I tried to seal myself up, I always managed to get arsenic powder in my hair. And who knows what I was breathing through the respirator. All this for just over 6 bucks an hour. Who needs grad students- undergrads are even cheaper!
Slashdot Mirror
Man, you ever try to keep up with a tachyon? I swear those things go at least 10,000,000 miles a minute- must be the drugs. They are like "Speed" on crack.
Where did you get string theory out of that article? It never mentioned it at all. And interference patterns don't need string theory to be explained. String theory is more useful to explain things like what the universe was like close to the Big Bang, why gravity is weak, why the universe is expanding at an accelerating rate, yada yada.
Anti-matter exists. It can be detected and observed. "Shadow protons" has nothing to do with the article- it was photons, not protons, and those two things cannot possibly be more different. Shadow photons have a much better name- virtual photons, and they are already used in theory. And they are just that- a theoretical convenience. They don't really "exist" in the sense that other matter (or anti-matter, no real difference there) does. In short, this paper doesn't really seem to say anything new, though apparently the author thinks it does.
After passing through the first filter the light has been polarized in some direction- all of the perpendicular components have been removed by the filter.
In the first case, there is only one other filter, oriented at 90 to the first one. This will only allow the components of light polarized 90 to the first screen's orientation to pass. But all of those components were removed, so nothing gets thru. In the second case, your filter is not oriented at 90, but at 45 to the first filter. Hence it will only components of light at 45 to the first filter's orientation to pass. But using vector analysis, we can break that orientation up into two vector components (that match up with the orientations of the first and third screens), and see that some light will get thru. How much? Well, cosine of 45 is 1/sqrt[2], and the intensity of the transmitted light goes as the square of that, so 1/2 of the light coming from the first filter gets through the 2nd filter.
Also, 1/2 of the original light went thru the first filter- this assumes a random distribution of polarizations of incoming light, i.e. unpolarized light.
Since the third filter is oriented at 45 to the second, we get another factor of 1/2. Totaling up all 3, we get 1/8 of the original intensity. I hope this makes sense. It probably won't unless you are comfortable with vectors.
Mod this up. I was going to say something to the same effect, but I was afraid to use the phrase "wave packet". This is an excellent description of how the overwhelming majority of physicists view this phenomenon.
Basically, light behaves as a wave, and since waves can constructively and destructively interfere with one another (cast two stones simultaneously in a pond and oberve the resulting interference pattern) light will form a funny looking pattern that one would not intuitively expect on a screen some distance from the slit.
LOL. I get it.
It's me, Dave, man! Let me in!
I've always thought that life would probably require a heady number of different chemical elements, thus we would find it in areas of the universe with an abudance of heavy elements (like gold, lead, etc.). My guess would be that this solar system is probably a 2nd or 3rd generation system meeting those requirements- 7-10 billion years ago there probably was not nearly as many star systems with the abundance of transistion metals that we have here. And I think those are just as necessary for "complex" life as the basic carbon, oxygen, hydrogen, etc. are for life was we know it.
2000? Who were your buddies? I graduated in 2000, so maybe I knew them.
I was a physics undergrad at Case, and actually had Starkman as a professor for a mathematical physics course. I have chatted with Krauss a few times since graduation on science topics involving public education. These are good guys, glad to see them headlining slashdot this morning.
A solenoid is just a coil of wire. It produces a magnetic field inside the coil. This field can be made to change strength and direction by altering the flow of current in the wire. This field can result in a force that will accordingly push or pull magnetic materials. Unfortunately, most materials won't really react to this field, so I am guessing something ferromagnetic is coupled to any moving bits if solenoids are used.
Did anybody notice that if the 1:15 million scale quoted in the Slashdot article is correct that 10 scale miles is 150 million miles? The average distance from the Earth to the Sun is roughly 93 million miles, so 150 million is a about 50% too high. Which is wrong, the scale provided or the scale distance quoted?
I, Robot: The Illustrated Screenplay
Seriously. You could have a whole string of good sequals too- the Naked Sun, etc. Just please, not Elijah Wood as Daniel Olivaw...
I have read I, Robot a few times (the most recent was several years ago), and I cannot recall any type of story like this. It seems to me that the screenplay is not based on any Asimov story as much as it uses his 3 Laws of Robotics as a plot device. So if you were thinking it was anything like the stories in I, Robot, this is not it. In the book, robots slowly progress from primitive models to one that is virtually indistinguishable from humans and becomes a powerful politician. That doesn't look to be happening in the movie (then again, we probably could have figured that out when Will Smith signed on).
Does this remind anyone of Fahrenheit 451 at all? The houses in the book had walls that were actually like TV's. I can imagine an array of LCD panels that are backlit via this type of technology being used as a wall TV. Imagine [insert FPS of your choice] on a small wall, say 15'x10'...
Basically, it is a round piece of metal with holes in it, and a handle on the side. You stick it under your pot to keep the bottom from getting so much warmer than the rest of the pot. Works great on both gas and electric. It's about 1/2" thick, and not expensive, unfortunately, I don't know its real name.
It's amazing what a gigantic bandgap can do for a material.
It's out at 5 comments. Wow.
Sure being in a gravitational field could have different effects at a quantum level- if you had an interaction potential that was gravity dependent, this would change the eigenvalues of Schrodinger's equation. It's kind of like the broken degeneracy in the Zeeman effect.
Can gravity affect the other four forces? Not really, no more than the electric interaction 'affects' the weak interaction or the strong nuclear interaction.
I hope your tube is heat-resistent, because when mars and venus are on opposite sides of the sun, guess what happens?
Actually, in a sense, it was Bush. Bush the Elder that is. Though it was a Democratic Congress at the time that actually killed the bill if I remember correctly.
I find the 'fat and bald' bit incredibly entertaining.
Well, after this was done, and the furnace was opened, there would be a bunch of plated arsenic on the inside of the furnace. This would interfere with the next crystal growth run, so it had to be removed. I'd get suited up in a bunny suit, wear two or three layers of gloves, a heavy duty respirator, and Tyvek booties to clean this thing using a metal scrub brush. I'd spend 6 hours in this suit, which was boiling hot since it didn't breathe at all, the whole time contorted in weird positions to get at the inner surface of the furnace with my brush.
By the time I was done, my muscles were sore, I was extremely hot, and there was arsenic everywhere. No matter how hard I tried to seal myself up, I always managed to get arsenic powder in my hair. And who knows what I was breathing through the respirator. All this for just over 6 bucks an hour. Who needs grad students- undergrads are even cheaper!