It is a fair warning, but doesn't seem likely that in the next 10 years phones will be able to transmit movies over 'multi-megabit networks', if only because of power constraints. Having you phone ring during the movies is a bad idea already... Z
How selective is this thing anyway? I cannot see anything which might be a filter on the board, so does it only pick out cell phone frequencies? Or also wireless headphones, wireless (non cellular) telephones, wireless car locks,... Z
Not taking sides in the discussion whether we have good enough ground-based telescopes or not, an interesting telescope exists, having adaptive optics to compensate for air tremor. More in this article from IEEE spectrum.
Z
Why is it that every time new technology emerges, initial ideas focus on musea ('virtual guide') and libraries ('virtual book'), when these places usually are short of cash, and their audience is mostly more interested in content, rather than technology?
Or otherwise, such as in this case, some form of 'communicative art' for people with apparently too much time on their hands. Who would like to leave messages to random strangers, no less? And how reliable will this info be? Is this what we want to invest in? Let alone privacy issues (apparently, a system tracks your whereabouts), legal issues (are you held responsible for the contents of your notes?), etc.
This being said, I admit it is a nice way to test
pervasive communications, but imho, if we want to bring people closer together, and share a collective memory, maybe it would be better to do it in a non-electronic way...
Z
There even exists a _real_ musical language, in which musical patterns represent actual words. This language was developed in the 19th century, by Sudre, and was called Solresol. He even wrote dictionaries and such. It never really cought on.
All ok and well that you don't need glasses, but I can imagine glasses are a bit more forgiving with respect to thje viewer's position. Do they give any info on that?
...it can be played till the end even if the viewing window is finished. If the user tries to play the disk after the end of the viewing window, the DVD players displays "NO DISC".
So it can also become unusable just by taking it out of the box (suffiently long time). I wonder: - is the entire disc degraded, or just the headers (whatever these are called on DVDs)? - if the entire disc degrades: how sharply is the viewing period defined? I can imagine that, if you are unlucky, you will see the onset of degradation (artefacts etc) even during your 'legal' viewing time.
RF is crazy stuff. Since the inside of a case is mostly reflective, any small hole in the case (such as where your fan comes out, any air vents, etc) will effectivel cause all the RF to leak out. There's plenty of those in any standard case.
Not entirely true. If the hole is small enough with respect to the wavelength, (next to) nothing will leak out. This is why microwaves stay in the oven, even though reflecting light from your potatoes comes through the holes.
While for the average person this RF-pollution is no problem, it can be e.g. for radio amateurs. RF emanation from computers can easily drown weak signals. And yes, you can tell the difference between a good and a bad case.
Not that the article does NOT mention that this thing performs better than ADSL of VDSL. Is is just backwards compatible. It is almost theoretically impossible to do better than VDSL, unless you increase power (which is cheating), because line attenuation is too high.
On very short lines (a few hundred feet), the line characteristics may support higher data rates than VDSL offers.
Therefore it is my guess that technology is not necessarily meant for contacting your ISP, although that may be an interesting application. Rather it will be used to interconnect two very close office buildings that don't have a buries ethernet network, but are connected with twisted pair cables.
Anyway,imho all discussions about 'will ISP's support this rate' are pointless, unless you live at most 100 feet from one.
Twin primes are pairs of primes where both p and p + 2 are prime
Maybe I have gotten something wrong, but does the article really prove that an infinite number of (p, p+2) exist, both prime? I didn't RTFA, because it looked too difficult at first glance, but it appears that they prove something else. Besides, the statement in the heading is a trivial result from the proof 'there is no highest prime number'.
In short: multiply all consecutive prime numbers upto a certain value, call this M. Both M-1 and M+1 are prime and differ by 2.
The article is a bit more involved, and about something else...
Slashdot Mirror
By Horowitz ans Hill is a very nice and complete book about analog and digital electronics
Z
They had better built an extra-big server.
If only I could attach this one to my cell phone...
It is a fair warning, but doesn't seem likely that in the next 10 years phones will be able to transmit movies over 'multi-megabit networks', if only because of power constraints. Having you phone ring during the movies is a bad idea already...
Z
How selective is this thing anyway? I cannot see anything which might be a filter on the board, so does it only pick out cell phone frequencies? Or also wireless headphones, wireless (non cellular) telephones, wireless car locks,...
Z
Not taking sides in the discussion whether we have good enough ground-based telescopes or not, an interesting telescope exists, having adaptive optics to compensate for air tremor. More in this article from IEEE spectrum.
Z
This would aoso affect your computer screen. Just turn it upside-down if you want to simulate. You'll be amazed...
Z
It says it has:
Parallel processing: 7 processors
1 Mitsubishi CPU (M30803)
1 Texas Instruments CPU (MSP 430)
Spartan FPGA with 5 Automata
In total 7 CPUs, if you wish...
Z
Or otherwise, such as in this case, some form of 'communicative art' for people with apparently too much time on their hands. Who would like to leave messages to random strangers, no less? And how reliable will this info be? Is this what we want to invest in? Let alone privacy issues (apparently, a system tracks your whereabouts), legal issues (are you held responsible for the contents of your notes?), etc.
This being said, I admit it is a nice way to test pervasive communications, but imho, if we want to bring people closer together, and share a collective memory, maybe it would be better to do it in a non-electronic way...
Z
... and I thought this would have something to do with Mersenne primes (Hmm, primes...). Speaking of disappointment.
There even exists a _real_ musical language, in which musical patterns represent actual words. This language was developed in the 19th century, by Sudre, and was called Solresol. He even wrote dictionaries and such. It never really cought on.
More info on Solresol
Z
All ok and well that you don't need glasses, but I can imagine glasses are a bit more forgiving with respect to thje viewer's position. Do they give any info on that?
...it can be played till the end even if the viewing window is finished. If the user tries to play the disk after the end of the viewing window, the DVD players displays "NO DISC".
So it can also become unusable just by taking it out of the box (suffiently long time). I wonder:
- is the entire disc degraded, or just the headers (whatever these are called on DVDs)?
- if the entire disc degrades: how sharply is the viewing period defined? I can imagine that, if you are unlucky, you will see the onset of degradation (artefacts etc) even during your 'legal' viewing time.
RF is crazy stuff. Since the inside of a case is mostly reflective, any small hole in the case (such as where your fan comes out, any air vents, etc) will effectivel cause all the RF to leak out. There's plenty of those in any standard case.
Not entirely true. If the hole is small enough with respect to the wavelength, (next to) nothing will leak out. This is why microwaves stay in the oven, even though reflecting light from your potatoes comes through the holes.
While for the average person this RF-pollution is no problem, it can be e.g. for radio amateurs. RF emanation from computers can easily drown weak signals. And yes, you can tell the difference between a good and a bad case.
Not that the article does NOT mention that this thing performs better than ADSL of VDSL. Is is just backwards compatible. It is almost theoretically impossible to do better than VDSL, unless you increase power (which is cheating), because line attenuation is too high. On very short lines (a few hundred feet), the line characteristics may support higher data rates than VDSL offers. Therefore it is my guess that technology is not necessarily meant for contacting your ISP, although that may be an interesting application. Rather it will be used to interconnect two very close office buildings that don't have a buries ethernet network, but are connected with twisted pair cables. Anyway,imho all discussions about 'will ISP's support this rate' are pointless, unless you live at most 100 feet from one.
Twin primes are pairs of primes where both p and p + 2 are prime
Maybe I have gotten something wrong, but does the article really prove that an infinite number of (p, p+2) exist, both prime? I didn't RTFA, because it looked too difficult at first glance, but it appears that they prove something else. Besides, the statement in the heading is a trivial result from the proof 'there is no highest prime number'.
In short: multiply all consecutive prime numbers upto a certain value, call this M. Both M-1 and M+1 are prime and differ by 2.
The article is a bit more involved, and about something else...
Z.