That doesn't work at all. No one bought a PS3 specifically for the otheros feature. It was a pointless feature which had nothing to do with its basic operation or the reason it was purchased.
I did.
I bought it so that I could run MythFrontend on a games console under the TV. This lets me watch and manage recorded programs stored on a server in another room. So, I spent extra money on a PS3 rather than an XBOX. I was very pleased with the results.
Also, I can run GameOS and play games, and currently enjoy MW2 online for which I need to talk to PSN.
This was the purpose for which I intended my PS3 to be used, and now I have to choose one or the other. This p*sses me right off.
I have my MacBook Pro, iPhone and Steve-Jobs-Picking-Up-A-Quarter-Blow-Up-Doll, presumably just like everyone else who would consider buying one of these things. But I agree that it is less good than the other devices that I have for all of the above tasks. Therefore I can't see why I would want one of these.
I use an old, practically scrap, Pentium 4 hidden away in the loft running Mythbackend with tuners and big hard drives in it. It sits there and records programs. It uses a Fedora 9 distro, and dependency hell was dealt with smoothly by running yum.
Under the main television that we watch is a PS3, which sees the backend as a UPnP media server without any fuss. All recorded programs show up under the "video" menu. Any machine in the house can also be used as a frontend, if Mythfrontend is installed. Mythweb can be used to configure it remotely (even off-site if I'm feeling brave enough to let incoming conections to it from the outside world) so you can log in and set something to record if you are out and about.
I'm really happy with the system and not got any particular moans, other than the fact that tuners don't just work out of the box and forums have to be read...
I agree that there should be a more "balanced" view.
If we go back a couple of generations ago, I seem to remember the UK valuing freedom at upwards of 250 000 lives, and paying that price. Now we are prepared to give all that up to save a few ?
I think it would be a surprise if antimatter was not discovered in a lightening flash. Gamma rays up to 20 MeV have been discovered there. I think they are technically X-rays, not gamma rays because they are not coming from the nucleus of an atom, they are coming from accelerated free electrons.
Gamma rays of energy > 1.022 MeV ( i.e. 2 x 511keV, the mass of an electron) can decay to form an electron-positron pair in the presence of another atom. http://en.wikipedia.org/wiki/Matter_creation
If this happens (which it should) , then positrons will be present in the storm.
Positrons decay by a reverse process to the above, meeting an electron and decaying into two gamma rays of 511keV back-to-back. Spotting these 511keV photons is the classic signature for "anti-matter". http://en.wikipedia.org/wiki/Electron-positron_annihilation .
Get the soldering iron and just replace them ! I've kept a couple of motherboards alive doing just this. They let you know when they have gone because they split open at the top.
I found the "transparent" aluminium description quite annoying as well!
Sapphire/Alumina ( Al2O3 ) is very hard, and _very_ temperature resistant, but also likely to be quite brittle. Hardness is not the whole story. To withstand 20mm cannon rounds or worse, there needs to be a degree of elasticity/flexibility just to spread the load out a bit, otherwise it will not protect against impacts.
A thought experiment: Take a piece of ceramic ( any sort ) place it on a surface and hit it hard with a hammer.
Presumably ALON's special qualities lie specifically in its impact strength not just its hardness.
Perhaps this stuff is laminated, or coated as well - hence polishing seems to be so important (?)
In my country, (UK) before we go abroad (somewhere outside of Europe/N. America/Japan), it is quite usual to wander down to the local surgery and get whatever vaccinations are recommended for that area of the world. I went to the Carribean the other year and got at least two jabs in each arm - for free of course. God alone knows what they were for.
Is this not the case in the US ? Would they charge you lots of money to have this done ?
This is something that has interested me for some time - I have always wondered how they avoid jamming each other. Having stumbled into a small disused building full of sleeping bats and accidentally disturbed (hundreds of) them, I can safely say that they do sometimes flock together in large numbers. This would mean that in this situation, if they only relied on direction to "filter" out their own noise, in a flock like this they would be effectively blinded by each other ( perhaps they were! it wasn't dark at the time and they do have eyes they could use)
Also, even though the emissions from your bat head are directional, the reflected signals aren't going to be. A bat could pick up the reflected signals from another bat if his/her ears were pointed in the right direction.
Temporal domain "filtering" is possible: speed of sound in air 330m/s; therefore anything heard >~100ms after emission can be disregarded, but when they go for their prey I noticed that they don't leave a lot of a gap between clicks - making very rapid repetitions of noises until they catch that insect.
Another consideration - the consequences of getting an eroneous picture of the world around you and subsequent poor navigation could result in injury - a big deal for a creature that has to be able to fly to catch food. IMVHO it is unlikely that they haven't evolved anti-jamming technology.
Humans can recognise an individual voice in a crowded room - it is possible to "tune in" to a conversation at a table behind you in a crowded restaurant above all of the noise in the same frequency band. From my experience of DSP, I would hate to imagine the complexity of what is going on in the brain in this situation, but clearly it can be done - the neuro/physiological processing such as that found in hearing and sight leaves me in absolute awe.
Bat emissions look pretty complex to me, and I'm willing to bet that they do identify their own squeak amongst all of the other noise. Modern radar uses correlation and signature techniques that mean that they only identify their own emissions. Why not bats ? Is this part of your project ?
[ good luck with the work by the way it sounds like great fun. ]
"We've combined the high energy density of the solid state laser with the thermal management of the liquid laser," New Scientist quoted project manager Don Woodbury as saying.
Call me a cynic, but it sounds like they just water cooled it!
I tried that but blew chunks in "Leicester Square" and had to be taken home. It is a hell of a lot of beer to have to drink! - And it takes ages madly running around in Cabs, busses and on the tube.
I don't think that it would be in anybody's interest to block the sales of the devices: NTP could put RIM out of business, yes, but then they would loose out too! They may just want to screw RIM out of as much money as they can... and maybe try to take control of pricing policy or somesuch. This is all probably just part of an ongoing negotiation process. At the end of the day I do not think that it will affect availability of the devices, and the price the public pay for it is the price that they are prepared to pay ( based on other stuff that is available)
So I think that the public might not be deprived of their Blackberries, and one more set of lawyers get piles of money for doing nothing other than exploiting a clearly corrupt patent system.
Does anyone know what the actual patent is ? I'll bet it is something weak like "sending an e-mail from a portable device" or some such rubbish that anyone could have thought up ( but not actually implemented.)
I am a physicist, and fully agree with you that the energy of microwave photons is not sufficient to break bonds. BUT - Microwave absorption spectra are full of frequencies that cause rotation and vibration of one part of a molecule relative to another.
Proteins and enzymes, and probably even DNA (IANABC) rely heavily on steric (shape) effects to do their work. Why cannot microwaves cause a molecule to flip and turn into a stereoisomer of itself ?
Consider the horrors of, for example,
prions such as those that cause CJD.
Here is an example of a simple stereoisomer of a protein, wreaking havoc by its mere presence causing the production of more of the wrong stereoisomer.
So, Maybe if microwave radiation does not affect DNA, what about the proteins found around it that function to repair and monitor damage ? How about turning them into stereoisomers and stopping them from functioning ?
I agree with your view that natural fluctuations in temperature are going to be significant, but I am concerned by peoples use of summer temperatures and such to measure damage to the planet regarding global warming anyway. The problem may even be much worse, although not necessarily our fault.
Here is a thought experiment:
Place some ice cubes in a glass of water. Wait a couple of minutes for the temperature to equalise and then measure the temperature. 0 degrees C.
Heat the glass of water with a blow-torch for a few seconds. and wait a couple of minutes for the temperature to equalise. Measure the temperature again. 0 degrees C. But the ice-cubes just got smaller.
Hence, Arctic/Antarctic Ice Cap ( the ice in our glass) thickness must be a better measure of global warming at this stage (until they all melt, our temperature may stay nearly constant.) British submarine surveys done during the '40s first measured the thickness and comparisons with the thickness today are frightening. People near the poles are going to notice it first as the ice caps begin to get thinner and recede.
A quick google came up with this old article
from 1999 about surveys from the US Navy.
I agree strongly that people should take responsibility for themselves and their children.
The PTC do seem to have an evangelical undertone though, and so I guess they have a subtext to spoil everybody else's fun also. Perhaps they see violence on telly as the root of all social ills. Apparently, words such as "Damn," and "Hell" are offensive to these people (speaking as an Englishman, I do not know of anyone that would fall over in shock upon hearing these words)
IMO, however, their website is one of the funniest pieces of work on the net. Many of us in Europe have not ever experienced this degree of conservatism. I recommend reading one of their reviews for a show, for example, "Angel" is particularly good!
I have not yet contacted my MEP, but I just found that he has been singled out for special mention by the
FFII! and FFII UK.
I can vote against him!
Looks like I might bother voting for the first time in a Euro election. Might even write to him and tell him why.
Re:Frequency change=nonlinearity=high levels
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Directed Sound
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Yes, I did look at that for a bit before posting because it did seem like a reason for it to work in linear media... But if you look what your formula creates ( which is quite valid and correct!), it is exactly like an AM radio signal - a carrier modulated with a low frequency - the sum frequency multiplied by the difference frequency. You still will not hear this. If you look at the frequency spectrum you will see simply two signals one at u and one at v, and nothing down below. If you look on a scope, you will see a signal that looks like (u+v) contained in an envelope that looks like (u-v). But, still all components are ultrasonic. Only if you can get the two components to "intermodulate" will you really get the sum and difference frequencies to appear in the spectrum....
Re:Frequency change=nonlinearity=high levels
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Directed Sound
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· Score: 1
Not letting you get away with that... Parent seems to have got the point.
A linear system is one where F(a+b) = F(a) + F(b). This is not very exciting for this application because the two waves will just add together, and not create beat frequencies. For vanishingly "small" sounds this will hold true.
To get beat frequencies you have to multiply them together not add them.
A non-linear system (I notice in the article they make a point of mentioning "distortion," i.e. non-linearity) starts to create extra signals that contain a * b, amongst others, and they get more significant as you increase the amplitude. This is where you start to get beat frequencies appear in addition to your two initial signals.
If a is cos (ut), your first signal, and b is cos (vt), a second signal and you multiply them together you get :
cos (ut) . cos (vt) = (1/2)[cos (ut-vt) + cos (ut+vt)]
which is your beat frequency and another higher frequency sum.
So, to get this effect something has to be non-linear, and loud.
Re:Frequency change=nonlinearity=high levels
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Directed Sound
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I thought this too.
I didn't realise air was that non-linear. Is the signal mixing in the air, or in your eardrums ?
If they did it from the rooftops at MIT, the required levels can't be that high...
I have enquired before about bringing cheap foreign merchandise back to our green and pleasant land...
The duty you owe is :
10% import tax, then
17.5% UK VAT on top of that.
Works out at 29.25% (more than 27.5)
So your $2000 laptop will cost $2585
One thing, if you are paying VAT you shouldn't really have to pay sales tax in the US, although how this can be avoided I don't know.
There are _SO_ many times I have come back home (from outside the EU) to find no customs officers anywhere to be seen (Heathrow, Birmingham, Gatwick.) and I nearly always carry a laptop which I took out with me because I travel on buisness - and so do loads of others.
The temptation is immense, but probably not worth it!
Slashdot Mirror
That doesn't work at all. No one bought a PS3 specifically for the otheros feature. It was a pointless feature which had nothing to do with its basic operation or the reason it was purchased.
I did.
I bought it so that I could run MythFrontend on a games console under the TV. This lets me watch and manage recorded programs stored on a server in another room. So, I spent extra money on a PS3 rather than an XBOX. I was very pleased with the results.
Also, I can run GameOS and play games, and currently enjoy MW2 online for which I need to talk to PSN.
This was the purpose for which I intended my PS3 to be used, and now I have to choose one or the other. This p*sses me right off.
PS3 Slims apparently do not support Linux !!! Which makes it a downgrade in my opinion
I have my MacBook Pro, iPhone and Steve-Jobs-Picking-Up-A-Quarter-Blow-Up-Doll, presumably just like everyone else who would consider buying one of these things. But I agree that it is less good than the other devices that I have for all of the above tasks. Therefore I can't see why I would want one of these.
Under the main television that we watch is a PS3, which sees the backend as a UPnP media server without any fuss. All recorded programs show up under the "video" menu. Any machine in the house can also be used as a frontend, if Mythfrontend is installed. Mythweb can be used to configure it remotely (even off-site if I'm feeling brave enough to let incoming conections to it from the outside world) so you can log in and set something to record if you are out and about.
I'm really happy with the system and not got any particular moans, other than the fact that tuners don't just work out of the box and forums have to be read ...
If we go back a couple of generations ago, I seem to remember the UK valuing freedom at upwards of 250 000 lives, and paying that price. Now we are prepared to give all that up to save a few ?
Gamma rays of energy > 1.022 MeV ( i.e. 2 x 511keV, the mass of an electron) can decay to form an electron-positron pair in the presence of another atom. http://en.wikipedia.org/wiki/Matter_creation
If this happens (which it should) , then positrons will be present in the storm.
Positrons decay by a reverse process to the above, meeting an electron and decaying into two gamma rays of 511keV back-to-back. Spotting these 511keV photons is the classic signature for "anti-matter". http://en.wikipedia.org/wiki/Electron-positron_annihilation .
Get the soldering iron and just replace them ! I've kept a couple of motherboards alive doing just this. They let you know when they have gone because they split open at the top.
I have just started work on my Ark!
I found the "transparent" aluminium description quite annoying as well!
Sapphire/Alumina ( Al2O3 ) is very hard, and _very_ temperature resistant, but also likely to be quite brittle. Hardness is not the whole story. To withstand 20mm cannon rounds or worse, there needs to be a degree of elasticity/flexibility just to spread the load out a bit, otherwise it will not protect against impacts.
A thought experiment: Take a piece of ceramic ( any sort ) place it on a surface and hit it hard with a hammer.
Presumably ALON's special qualities lie specifically in its impact strength not just its hardness.
Perhaps this stuff is laminated, or coated as well - hence polishing seems to be so important (?)
Is this not the case in the US ? Would they charge you lots of money to have this done ?
Also, even though the emissions from your bat head are directional, the reflected signals aren't going to be. A bat could pick up the reflected signals from another bat if his/her ears were pointed in the right direction. Temporal domain "filtering" is possible: speed of sound in air 330m/s; therefore anything heard >~100ms after emission can be disregarded, but when they go for their prey I noticed that they don't leave a lot of a gap between clicks - making very rapid repetitions of noises until they catch that insect.
Another consideration - the consequences of getting an eroneous picture of the world around you and subsequent poor navigation could result in injury - a big deal for a creature that has to be able to fly to catch food. IMVHO it is unlikely that they haven't evolved anti-jamming technology.
Humans can recognise an individual voice in a crowded room - it is possible to "tune in" to a conversation at a table behind you in a crowded restaurant above all of the noise in the same frequency band. From my experience of DSP, I would hate to imagine the complexity of what is going on in the brain in this situation, but clearly it can be done - the neuro/physiological processing such as that found in hearing and sight leaves me in absolute awe.
Bat emissions look pretty complex to me, and I'm willing to bet that they do identify their own squeak amongst all of the other noise. Modern radar uses correlation and signature techniques that mean that they only identify their own emissions. Why not bats ? Is this part of your project ? [ good luck with the work by the way it sounds like great fun. ]
Call me a cynic, but it sounds like they just water cooled it!
I tried that but blew chunks in "Leicester Square" and had to be taken home. It is a hell of a lot of beer to have to drink! - And it takes ages madly running around in Cabs, busses and on the tube.
So I think that the public might not be deprived of their Blackberries, and one more set of lawyers get piles of money for doing nothing other than exploiting a clearly corrupt patent system.
Does anyone know what the actual patent is ? I'll bet it is something weak like "sending an e-mail from a portable device" or some such rubbish that anyone could have thought up ( but not actually implemented.)
Proteins and enzymes, and probably even DNA (IANABC) rely heavily on steric (shape) effects to do their work. Why cannot microwaves cause a molecule to flip and turn into a stereoisomer of itself ?
Consider the horrors of, for example, prions such as those that cause CJD. Here is an example of a simple stereoisomer of a protein, wreaking havoc by its mere presence causing the production of more of the wrong stereoisomer.
So, Maybe if microwave radiation does not affect DNA, what about the proteins found around it that function to repair and monitor damage ? How about turning them into stereoisomers and stopping them from functioning ?
We wrote one, but sadly YOU DIDN'T READ IT .
Ok, I admit not before coloniali s ation - but it was well before you started stamping your feet and threw all the tea in the harbo u r.
Yes, its saying you can now display a BSOD (Blue Screen of Death) on a small LCD (Liquid Crystal Display)
Here is a thought experiment:
Place some ice cubes in a glass of water. Wait a couple of minutes for the temperature to equalise and then measure the temperature. 0 degrees C.
Heat the glass of water with a blow-torch for a few seconds. and wait a couple of minutes for the temperature to equalise. Measure the temperature again. 0 degrees C. But the ice-cubes just got smaller.
Hence, Arctic/Antarctic Ice Cap ( the ice in our glass) thickness must be a better measure of global warming at this stage (until they all melt, our temperature may stay nearly constant.) British submarine surveys done during the '40s first measured the thickness and comparisons with the thickness today are frightening. People near the poles are going to notice it first as the ice caps begin to get thinner and recede.
A quick google came up with this old article from 1999 about surveys from the US Navy.
The PTC do seem to have an evangelical undertone though, and so I guess they have a subtext to spoil everybody else's fun also. Perhaps they see violence on telly as the root of all social ills. Apparently, words such as "Damn," and "Hell" are offensive to these people (speaking as an Englishman, I do not know of anyone that would fall over in shock upon hearing these words)
IMO, however, their website is one of the funniest pieces of work on the net. Many of us in Europe have not ever experienced this degree of conservatism. I recommend reading one of their reviews for a show, for example, "Angel" is particularly good!
I can vote against him!
Looks like I might bother voting for the first time in a Euro election. Might even write to him and tell him why.
Yes, I did look at that for a bit before posting because it did seem like a reason for it to work in linear media ... But if you look what your formula creates ( which is quite valid and correct!), it is exactly like an AM radio signal - a carrier modulated with a low frequency - the sum frequency multiplied by the difference frequency. You still will not hear this. If you look at the frequency spectrum you will see simply two signals one at u and one at v, and nothing down below. If you look on a scope, you will see a signal that looks like (u+v) contained in an envelope that looks like (u-v). But, still all components are ultrasonic. Only if you can get the two components to "intermodulate" will you really get the sum and difference frequencies to appear in the spectrum....
A linear system is one where F(a+b) = F(a) + F(b). This is not very exciting for this application because the two waves will just add together, and not create beat frequencies. For vanishingly "small" sounds this will hold true.
To get beat frequencies you have to multiply them together not add them. A non-linear system (I notice in the article they make a point of mentioning "distortion," i.e. non-linearity) starts to create extra signals that contain a * b, amongst others, and they get more significant as you increase the amplitude. This is where you start to get beat frequencies appear in addition to your two initial signals.
If a is cos (ut), your first signal, and b is cos (vt), a second signal and you multiply them together you get :
cos (ut) . cos (vt) = (1/2)[cos (ut-vt) + cos (ut+vt)]
which is your beat frequency and another higher frequency sum.
So, to get this effect something has to be non-linear, and loud.
I didn't realise air was that non-linear. Is the signal mixing in the air, or in your eardrums ?
If they did it from the rooftops at MIT, the required levels can't be that high ...
The duty you owe is :
10% import tax, then
17.5% UK VAT on top of that.
Works out at 29.25% (more than 27.5)
So your $2000 laptop will cost $2585
One thing, if you are paying VAT you shouldn't really have to pay sales tax in the US, although how this can be avoided I don't know.
There are _SO_ many times I have come back home (from outside the EU) to find no customs officers anywhere to be seen (Heathrow, Birmingham, Gatwick.) and I nearly always carry a laptop which I took out with me because I travel on buisness - and so do loads of others.
The temptation is immense, but probably not worth it!
It will support OGG when you have ported linux to it!