Since classical conduction equations are the same for electrical and thermal phenomena. I've wondered if it could be possible to create thermal-logic gates, and then purely thermal microprocessors.
In the conservation of momentum equations the impulse is m.v, So for four times the velocity gives you have four times the impulse, for a given mass of gas expelled.
The low torque is not a big concern. In space you can rotate a spaceship any way you want by using gyroscopes.
Conservation of angular momentum says that if you turn on a gyroscope, the spaceship must start rotating in the opposite sense so the total angular momentum is the same as in the beginning. At some point you stop the gyroscope and the ship stops rotating.
Another factor they mentioned is the power requirement. It's preferrable to use bands that can transmit farther/deeper using less power because some equipment quickly eats up batteries. (In many cases they use non-removable rechargeable packs)
This move might be another step in the wrong direction. If i'm not mistaken in a NPR radio show an expert said that some current commercial frequencies would be extremely useful for emergency responders since they can reach deeper inside buildings. They attributed the misuse of airwaves to lobby of big media groups.
Apparently a lot of the rescue radio communication problems detected after 9/11 have not been solved, changes can be quickly made when there's a commercial reason.
I agree it's atough sell. But why didn't he wait until after the holidays. My hope was the DVD sets would help get some extra revenue. In retrospect I should have bought one!
The interesting thing about how journals is not that they're immune to deception but that fake results can be easily spotted, because things are disclosed and documented in great detail. At the same time scientists want to maintain a good reputation, and the majority takes great pains to avoid these mistakes.
A pulse oxymeter is not a sophisticated device. A basic design requires only two LEDs a photosensor and an op amp. I'll guess the cost is in the tens of dollars.
Of course if you want it for medical purposes you need extra certifications for reliability, that I believe can drive the cost up.
The submitter mentioned cleaning lenses and other optical equipment.
I want to comment that that's a very tricky thing. Most optical manuals just say: Do not attempt to clean!!
Some recent developments are in the area of strip coatings (you pour a polymer over the surface and peel it off to remove dirt without damaging the optics). This has been tried since the early XX century but only recently has became practical.
Here's a link to a group that developed a sucessful formula for that process: http://www.uwplatt.edu/~hamiltoj/
As technology facilitates eavesdropping and spying on each other, one may well assume that the only reasonable thing to do is to adopt a position of total openness of information for all, with nobody having any secrets to hide.
The real question here is...If we were all wiretapped. How many of us would have things to hide?
That's true. But more interference protection could be a good idea, for example some devices might be certified to use in an airplane. Electrostatic dissipation might also help prevent static discharges frying sensitive chips.
I'd like to point out that using carbon fibers or nanotubes in consumer electronics has electrical advantages. Using a conductive filler you can achieve electromagnetic interference (EMI) protection or electrostatic dissipation (ESD). Other conductive fillers such as carbon black or metallic powders would work but due to the small aspect ratio of the particles they require large amounts, and this degrades the mechanical properties of the polymer. Some more infomration here http://www.patagon.8m.com/equations/cnt.html
It's not written in stone that you have to be friends with other people in your class/school/research area. I'm a Chemical Engineer but most of my friends are from other areas and i've met them outside of school. It's unhealthy to try and mix your work/study with your social life. An don't get me started with dating. Dating a co worker is not only pathetic, but inconvienient, when you break up you end up seeing that person daily.
According to this
report:
They claim that by using diamond lenses, it will be possible to store 1TB in an optical drive. Will it work? Will they develop it soon? Who knows?
Like in the Story by Arthur Clarke
on
19 million Amps
·
· Score: 1
...requiring outside research teams to acquire a license.
AFAIK for research you don't require a license. Only for commercialization. You can make a copy of any invention for research purposes.
Am I right?
No. AFAIK the story behind that is related to some faulty card which was sent for repair over and over. They fried it and made sure they would buy a new, more reliable one.
The line between scientific and "real" usage is probably very blurred, but I think many organizations would benefit from running simulations for purposes of optimization or scheduling. I understand that airlines run a model of their operations 24/7 to determine the prices of the air tickets, so as to maximize profit. Almost any business has to deal with scheduling and optimization problems.
I remember in a fluid dynamic course we did some balloon calculations, and one conclusion was that baloons are unstable, as they go up, the pressure decreases, so the gas keeps expanding until it bursts. I guess this might be different with a real materials, I don't recall how you model the elastic membrane stuff.
Slashdot Mirror
Since classical conduction equations are the same for electrical and thermal phenomena. I've wondered if it could be possible to create thermal-logic gates, and then purely thermal microprocessors.
In the conservation of momentum equations the impulse is m.v, So for four times the velocity gives you have four times the impulse, for a given mass of gas expelled.
IAN a Rocket sci. So I'm just guessing here. It might be to fine tune the focusing of the beam. The more straight it is the better.
The low torque is not a big concern. In space you can rotate a spaceship any way you want by using gyroscopes.
Conservation of angular momentum says that if you turn on a gyroscope, the spaceship must start rotating in the opposite sense so the total angular momentum is the same as in the beginning. At some point you stop the gyroscope and the ship stops rotating.
I agree, the following joke proves it:
Atom 1- Are you sure you lost an electron?
Atom 2- I'm positive.
Another factor they mentioned is the power requirement. It's preferrable to use bands that can transmit farther/deeper using less power because some equipment quickly eats up batteries. (In many cases they use non-removable rechargeable packs)
This move might be another step in the wrong direction. If i'm not mistaken in a NPR radio show an expert said that some current commercial frequencies would be extremely useful for emergency responders since they can reach deeper inside buildings. They attributed the misuse of airwaves to lobby of big media groups. Apparently a lot of the rescue radio communication problems detected after 9/11 have not been solved, changes can be quickly made when there's a commercial reason.
I agree it's atough sell. But why didn't he wait until after the holidays. My hope was the DVD sets would help get some extra revenue. In retrospect I should have bought one!
The interesting thing about how journals is not that they're immune to deception but that fake results can be easily spotted, because things are disclosed and documented in great detail. At the same time scientists want to maintain a good reputation, and the majority takes great pains to avoid these mistakes.
A pulse oxymeter is not a sophisticated device. A basic design requires only two LEDs a photosensor and an op amp. I'll guess the cost is in the tens of dollars.
Of course if you want it for medical purposes you need extra certifications for reliability, that I believe can drive the cost up.
The submitter mentioned cleaning lenses and other optical equipment. I want to comment that that's a very tricky thing. Most optical manuals just say: Do not attempt to clean!! Some recent developments are in the area of strip coatings (you pour a polymer over the surface and peel it off to remove dirt without damaging the optics). This has been tried since the early XX century but only recently has became practical. Here's a link to a group that developed a sucessful formula for that process: http://www.uwplatt.edu/~hamiltoj/
As technology facilitates eavesdropping and spying on each other, one may well assume that the only reasonable thing to do is to adopt a position of total openness of information for all, with nobody having any secrets to hide. The real question here is...If we were all wiretapped. How many of us would have things to hide?
That's true. But more interference protection could be a good idea, for example some devices might be certified to use in an airplane. Electrostatic dissipation might also help prevent static discharges frying sensitive chips.
I'd like to point out that using carbon fibers or nanotubes in consumer electronics has electrical advantages. Using a conductive filler you can achieve electromagnetic interference (EMI) protection or electrostatic dissipation (ESD). Other conductive fillers such as carbon black or metallic powders would work but due to the small aspect ratio of the particles they require large amounts, and this degrades the mechanical properties of the polymer. Some more infomration here http://www.patagon.8m.com/equations/cnt.html
I prefer randomly generated comics like these http://www.randomcomics.netfirms.com/
It's not written in stone that you have to be friends with other people in your class/school/research area. I'm a Chemical Engineer but most of my friends are from other areas and i've met them outside of school. It's unhealthy to try and mix your work/study with your social life. An don't get me started with dating. Dating a co worker is not only pathetic, but inconvienient, when you break up you end up seeing that person daily.
According to this report: They claim that by using diamond lenses, it will be possible to store 1TB in an optical drive. Will it work? Will they develop it soon? Who knows?
Reminds me of the story by Arthur Clarke "Technical Error":e w.php?callnumber=mf169
http://math.cofc.edu/faculty/kasman/MATHFICT/mfvi
...requiring outside research teams to acquire a license.
AFAIK for research you don't require a license. Only for commercialization. You can make a copy of any invention for research purposes.
Am I right?
I agree. It sets a bad example of mixing business with pleasure.
No. AFAIK the story behind that is related to some faulty card which was sent for repair over and over. They fried it and made sure they would buy a new, more reliable one.
Maybe some technical progress can be made during a war, but for *science* to progress, peacetime is much better.
Science relies on free exchange and distribution of knowledge. In war time discoveries are kept secret and thus can not be freely distributed.
Assuming there's video footage of the shutdown please someone post a torren... ...never mind
The line between scientific and "real" usage is probably very blurred, but I think many organizations would benefit from running simulations for purposes of optimization or scheduling. I understand that airlines run a model of their operations 24/7 to determine the prices of the air tickets, so as to maximize profit. Almost any business has to deal with scheduling and optimization problems.
I remember in a fluid dynamic course we did some balloon calculations, and one conclusion was that baloons are unstable, as they go up, the pressure decreases, so the gas keeps expanding until it bursts. I guess this might be different with a real materials, I don't recall how you model the elastic membrane stuff.