I have recently 'retired' a Nokia E71. I simply wish to use it as a skype phone (app installed). It keeps complaining about 'SIM card registration failed' but skype over WiFi seems (a bit laggy at times) to work fine. If I could get rid of the SIM complaints, I would be happy to live with the (understandable) WiFi lag.
Not quite. Yes the cell tower will put out 5kW, but each user (even if they eren't recharging their 'phone) will put a load on the cell. For a down-town cell, this load could well be significant. The RFID tag example is a good one.
The RFID sensor is a simple transmitter radiating at a specific frequency. The RFID tag represents a load to the transmitter. the sensor looks at the current being drawn by the transmitter (and by proxy, the tag) and decodes the current pulses into voltage pulses which are then decoded into a serial data stream.
This is not how cells work. They transmit at one frequency and receive on another.
BTW, I guess that I should mention that we are talking about 2.4 GHz here which means that cell-phone communications should be fine, but they'll annihilate any WiFi hotspots nearby, since that's where they'll be drawing their energy from. WiFi tends to run at about 1W. Hardly enough to charge more than say, 20 handsets...
I am of the belief that yes, you can re-charge your 'phone's battery from an R.F. power source (after all, it works for RFID). There are IMHO two caveats;
Your 'phone needs to be in standby, since when talking, you'll be using far more energy than the cell can provide.
Any active users will suffer reduced signal-strength due to all the passive users re-charging their 'phones. This power has to come from somewhere and that place will be the cell transmitter. Given enough 'phones re-charging and you won't be able to make/receive a call because your 'phone won't be able to hear the cell due to all the other 'phones sucking all the signal from it...
I had this thing called an Amiga. While the upper echelons could muster the folding for an '030 or an '040 (hence task-protection and memory management), the rest of us had to make do with the occasional guru-meditation. Either way, a massive hard-disk partition was not necessary (I agree, however, it was helpful). Don't dismiss minix. If AmigaDos could boot to a fully-functional desktop from a floppy, why can't minix?
I've read this whole mind-numbing thread (and the links). There have been some good and some bad arguments. I'll be upfront, I'm a big fan of nuclear (disclaimer: if it wasn't for medical isotopes, my mother wouldn't be alive today). After absorbing all this information, the choice is simple: CANDU, which works, or IFR which was working until they canned it. Any reactor where shutting down the cooling system means that the reactor becomes sub-critical is, for me, a major criterion.
This whole thread has missed the most important point. Heat. Everything we do, every process we engage, every time we press a button on the remote, the resultant activity involves the generation of heat. Let's say that we can provide ourselves with unlimited carbon-neutral energy. We still have the problem of inefficiency. Assuming zero methane and CO2, the heat we produce will remain a significant problem.
I wonder which car company will be the first to start producing boats?
Don't use terms at all. I'm sick of the euphamisms. Being an Australian, I freely admit that while we whiteys enjoy a comfortable standard of living, At the bottom of the food-chain we struggle, but even at the said bottom, we still experience a better quality of life than those at the bottom end of the indian experience except, perhaps for our indigenous population who run into the same degree of day-to-day suffering as the lower castes of India. It isn't about first or third world. It's about the spectrum of privilege to despair of it's citizens. First, second and third world is about that ratio. Given what we do to the people that had stewardship of this country before we came, I'd rate my country up with the U.S. Exploitative. That is the real term for first world. Ask the Navaho, ask the Cherokee, Ask the Koori, ask the untouchables.
More power to India (just hold off on the nukes, mkay? - There is an alternative).
Two pesos expended.
C:\>
I'm not sure why you posted anonymously one of the more informative entries in this thread. Might I just add that if I were responsible for switching over to a redundant system especially if I were uncertain as to the exact failure, I would be going over the software and hardware until I was certain of what was going to happen when I did.
For example: The primary system failed due a malfunction in the breakfast dispenser, the first thing that I would want to do is to ensure that the redundant system doesn't suffer the same fate, otherwise you're up the same creek and have just thrown your remaining paddle overboard. Subsequently, I'd be ensuring that the instruction sequence would be, for example:
instruction_1:switch_to_backup.
instruction_2:forget_the_breakfast_dispenser.
After all, if the redundant system fails in such a way that the ultimate failsafes don't - or can't - do their job, you have just bricked $55 million in hardware and as mentioned a service call isn't a one hour turnaround here.
Here's one I prepared earlier:
I got up at 4am to be on a 7am interstate flight to arrive onsite at 9am only to discover that neither the tools nor the spares existed to effect the repair *crickets... crickets*. Some embarrassment and some $300 out of pocket later I flew home. In space, radio-shack is not a ten minute trip away. If you don't have it with you, then your trip is a very expensive exercise in futility. I don't blame NASA for playing things carefully. After all, if you can fix it over the 'phone, rather than having to be there, I'm in favour of the 'phone call.
Ditto.
I posted something similar earlier in the thread, but chronologically later. This is a far more complete explanation. (reminder to self - read the whole thread before posting:( )
I've been. thinking about it. The Parent supplied the last piece of the puzzle.
Effectively, the waveform applied to a brushless motor is a customized AC signal that always matches the frequency of the spinning armature.
Close. The speed matches the frequency of the waveform. Increase the supply frequency, the motor speeds up. Reduce the same and it will slow down. This is why brushless motors are often referred to as synchronous motors.
This may also be a clue as to what is going on here. I reckon that what he's done here is to use the magnets to induce currents into the coils, which in turn magnetically couple those additional current pulses into the motor shaft (remember the iron slug in the first demo?). These additional pulses are then induced into the coils of the rotor which (synchronous, remember) thus speeds up. this also reduces the indicated supply current due to...
These pulses are not part of the supply current path
The motor is no longer under load. It is, however in a state of runaway positive feedback.
PayPal tells me that a copy of "Dirty Wings" is headed in my direction. I tasted two or three tracks and liked them - so I bought a copy. If you like SF/Star-Trek try New Voyages or Star Wreck They both use the same model. If you're into some seriously cool (although the business model is somewhat more commercial) DVDs try Animusic. They aren't free, but they are self-published.
C:\>
These guys did and do. There is no competition involved, they just want their music to be out there. Hey, they don't even have to pay for hosting, the Australian Broadcasting Corporation does.
Stream away. Better still, visit Triple J or even the catch of the day, where they've even found the best stuff for you.
There's also an annual "Triple J Unearthed CD" which is a compiliation of the top ten listeners' choices for the year. Unearthed #4 contains (track 3) Relapse by Endorphin. I loved it the moment I heard it. On the the strength of that one home-made track, when he brought out an album (yes he fell into the hands of the recording industry and is now making that pittance in royalties The Industry likes to refer to as "Big Money"), I bought it. That Unearthed entry was created using two walkmans in his bedroom.
Keep spending, mate, there are others who are simply getting on with it.
So much for the free trade agreement. We reduced copyright from 70 years to 50 and in return we received..... what?
DARPA invented TCP/IP, granted. We use it and pay for the privilege.
CSIRO invented 802.11g, how about returning the favour?
Fair's fair, after all.
It's about time our spineless government showed some guts and enforced the rights of some of the most talented people on the planet. We came up with some mind-bendingly good technology. Apparently no-one is interested in acknowledging the fact, let alone re-numerating the people who developed it. If Cisco had come up with this standard, they'd be in major litigation mode if anyone used it without the appropriate licensing agreement.
So, play fair. Accept the fact that we came up with some pretty cool sh!t and that credit is where credit's due - in a very financial sense.
C:\>
Thrust reversers cannot be used on a wet, slippery runway due to the very reason that it's wet and slippery and consequently the reverse thrust would blow more water under the landing gear.
Why not? Reverse thrust does not rely upon friction. I my thirty years of air travel I cannot remember a single time when reverse thrust wasn't used. Go and have a read and post up your apology once you have.
http://www.google.com.au/search?q=reverse+thrust&i e=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:offici al&client=firefox-a
would be a good start.
C:\>
Thank you sir, for our first coherent post. Problems clearly identified, workable solutions put forward. Would you agree that the issues here require more of a hardware-oriented solution than one in software; ie: 'let's understand the obstacles that the hardware has thrown at us and deal with them in a hardware-appropriate manner rather than the software-is-broken-so-we-write-more-software pseudo-solution'. This is a 'phone dammit, not a desktop/laptop. I have a Nokia 6230i that takes 30 seconds to shake it's head and take a look around when i get off the 'plane, my first mobile was ready in about 3 seconds... Something to do with being more hardware-centric, i guess...
Running at what, 4MHz? this is 2006, not 1986, but i do agree. The point here however, is that parts of the ARM will do this automatically - no coding required. Anyone who has studied chaos will appreciate the beauty of this approach. A bit like four mechanics playing poker until one of the robots on the production line breaks down. They then break into a flurry of activity to repair the machine, at which point, task complete, they return to their cards....
You must admit, however, that clock=state for most applications. Under many circumstances, straight logic is faster than that. I think that what we are talking about is a series of 'ready' signals, where speed of computation is limited by propagation, rather than by an arbitrary clock...
Pump: $20. Copper pipe: $40. Borer rental: $40. lowering the water table by 60+ metres: irreplaceable at any price read the cover story of the Feb 25th edition of newScientist (dead tree version, not sure if it's online) it just might change your mind.
Slashdot Mirror
I have recently 'retired' a Nokia E71. I simply wish to use it as a skype phone (app installed). It keeps complaining about 'SIM card registration failed' but skype over WiFi seems (a bit laggy at times) to work fine. If I could get rid of the SIM complaints, I would be happy to live with the (understandable) WiFi lag.
C:\>
Not quite. Yes the cell tower will put out 5kW, but each user (even if they eren't recharging their 'phone) will put a load on the cell. For a down-town cell, this load could well be significant. The RFID tag example is a good one.
The RFID sensor is a simple transmitter radiating at a specific frequency. The RFID tag represents a load to the transmitter. the sensor looks at the current being drawn by the transmitter (and by proxy, the tag) and decodes the current pulses into voltage pulses which are then decoded into a serial data stream. This is not how cells work. They transmit at one frequency and receive on another. BTW, I guess that I should mention that we are talking about 2.4 GHz here which means that cell-phone communications should be fine, but they'll annihilate any WiFi hotspots nearby, since that's where they'll be drawing their energy from. WiFi tends to run at about 1W. Hardly enough to charge more than say, 20 handsets...
Not arguing, responding.
C:\>
I am of the belief that yes, you can re-charge your 'phone's battery from an R.F. power source (after all, it works for RFID).
There are IMHO two caveats;
Your 'phone needs to be in standby, since when talking, you'll be using far more energy than the cell can provide.
Any active users will suffer reduced signal-strength due to all the passive users re-charging their 'phones. This power has to come from somewhere and that place will be the cell transmitter. Given enough 'phones re-charging and you won't be able to make/receive a call because your 'phone won't be able to hear the cell due to all the other 'phones sucking all the signal from it...
Just a thought.
C:\>
I had this thing called an Amiga. While the upper echelons could muster the folding for an '030 or an '040 (hence task-protection and memory management), the rest of us had to make do with the occasional guru-meditation. Either way, a massive hard-disk partition was not necessary (I agree, however, it was helpful). Don't dismiss minix. If AmigaDos could boot to a fully-functional desktop from a floppy, why can't minix?
C:
Moore's Law is about the bleeding edge. Netbooks are about compromise. Different churches, no hereticism. C:\>
I guess that they'd better get rid of C:\WINNT\system32\drivers\etc\ first.
C:\>
I've read this whole mind-numbing thread (and the links). There have been some good and some bad arguments. I'll be upfront, I'm a big fan of nuclear (disclaimer: if it wasn't for medical isotopes, my mother wouldn't be alive today). After absorbing all this information, the choice is simple: CANDU, which works, or IFR which was working until they canned it. Any reactor where shutting down the cooling system means that the reactor becomes sub-critical is, for me, a major criterion.
This whole thread has missed the most important point. Heat. Everything we do, every process we engage, every time we press a button on the remote, the resultant activity involves the generation of heat. Let's say that we can provide ourselves with unlimited carbon-neutral energy. We still have the problem of inefficiency. Assuming zero methane and CO2, the heat we produce will remain a significant problem.
I wonder which car company will be the first to start producing boats?
C:\>
Precisely. It's not about the economy, it's about survival of the masses. C:\>
Don't use terms at all. I'm sick of the euphamisms. Being an Australian, I freely admit that while we whiteys enjoy a comfortable standard of living, At the bottom of the food-chain we struggle, but even at the said bottom, we still experience a better quality of life than those at the bottom end of the indian experience except, perhaps for our indigenous population who run into the same degree of day-to-day suffering as the lower castes of India. It isn't about first or third world. It's about the spectrum of privilege to despair of it's citizens. First, second and third world is about that ratio. Given what we do to the people that had stewardship of this country before we came, I'd rate my country up with the U.S. Exploitative. That is the real term for first world. Ask the Navaho, ask the Cherokee, Ask the Koori, ask the untouchables. More power to India (just hold off on the nukes, mkay? - There is an alternative). Two pesos expended.
C:\>
I'm not sure why you posted anonymously one of the more informative entries in this thread. Might I just add that if I were responsible for switching over to a redundant system especially if I were uncertain as to the exact failure, I would be going over the software and hardware until I was certain of what was going to happen when I did.
For example: The primary system failed due a malfunction in the breakfast dispenser, the first thing that I would want to do is to ensure that the redundant system doesn't suffer the same fate, otherwise you're up the same creek and have just thrown your remaining paddle overboard. Subsequently, I'd be ensuring that the instruction sequence would be, for example:
After all, if the redundant system fails in such a way that the ultimate failsafes don't - or can't - do their job, you have just bricked $55 million in hardware and as mentioned a service call isn't a one hour turnaround here.
Here's one I prepared earlier:
I got up at 4am to be on a 7am interstate flight to arrive onsite at 9am only to discover that neither the tools nor the spares existed to effect the repair *crickets... crickets*. Some embarrassment and some $300 out of pocket later I flew home. In space, radio-shack is not a ten minute trip away. If you don't have it with you, then your trip is a very expensive exercise in futility. I don't blame NASA for playing things carefully. After all, if you can fix it over the 'phone, rather than having to be there, I'm in favour of the 'phone call.
C:\>
Ditto. :( )
I posted something similar earlier in the thread, but chronologically later. This is a far more complete explanation. (reminder to self - read the whole thread before posting
Close. The speed matches the frequency of the waveform. Increase the supply frequency, the motor speeds up. Reduce the same and it will slow down. This is why brushless motors are often referred to as synchronous motors.
This may also be a clue as to what is going on here. I reckon that what he's done here is to use the magnets to induce currents into the coils, which in turn magnetically couple those additional current pulses into the motor shaft (remember the iron slug in the first demo?). These additional pulses are then induced into the coils of the rotor which (synchronous, remember) thus speeds up. this also reduces the indicated supply current due to...
- These pulses are not part of the supply current path
- The motor is no longer under load. It is, however in a state of runaway positive feedback.
I'm disappointed too. Greetings all from Oz..Perhaps this is the flux capacitor?
:)
PayPal tells me that a copy of "Dirty Wings" is headed in my direction. I tasted two or three tracks and liked them - so I bought a copy. If you like SF/Star-Trek try New Voyages or Star Wreck They both use the same model. If you're into some seriously cool (although the business model is somewhat more commercial) DVDs try Animusic. They aren't free, but they are self-published.
C:\>
I'm listening to Insomnia now and love it. I'm just going through some of your highlighted (by genre) pieces, before I decide which CD(s) to buy. C:\>
These guys did and do. There is no competition involved, they just want their music to be out there. Hey, they don't even have to pay for hosting, the Australian Broadcasting Corporation does.
Stream away. Better still, visit Triple J or even the catch of the day, where they've even found the best stuff for you.
There's also an annual "Triple J Unearthed CD" which is a compiliation of the top ten listeners' choices for the year. Unearthed #4 contains (track 3) Relapse by Endorphin. I loved it the moment I heard it. On the the strength of that one home-made track, when he brought out an album (yes he fell into the hands of the recording industry and is now making that pittance in royalties The Industry likes to refer to as "Big Money"), I bought it. That Unearthed entry was created using two walkmans in his bedroom.
Keep spending, mate, there are others who are simply getting on with it.
C:\>So much for the free trade agreement. We reduced copyright from 70 years to 50 and in return we received..... what? DARPA invented TCP/IP, granted. We use it and pay for the privilege. CSIRO invented 802.11g, how about returning the favour? Fair's fair, after all. It's about time our spineless government showed some guts and enforced the rights of some of the most talented people on the planet. We came up with some mind-bendingly good technology. Apparently no-one is interested in acknowledging the fact, let alone re-numerating the people who developed it. If Cisco had come up with this standard, they'd be in major litigation mode if anyone used it without the appropriate licensing agreement. So, play fair. Accept the fact that we came up with some pretty cool sh!t and that credit is where credit's due - in a very financial sense. C:\>
I've had a quick skim through the replies.... How recent are these images? C:\>
Thrust reversers cannot be used on a wet, slippery runway due to the very reason that it's wet and slippery and consequently the reverse thrust would blow more water under the landing gear. Why not? Reverse thrust does not rely upon friction. I my thirty years of air travel I cannot remember a single time when reverse thrust wasn't used. Go and have a read and post up your apology once you have. http://www.google.com.au/search?q=reverse+thrust&i e=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:offici al&client=firefox-a
would be a good start.
C:\>
#include
void main()
{
printf("What? It isn't already happening?\n");
exit(0);
}
Thank you sir, for our first coherent post. Problems clearly identified, workable solutions put forward. Would you agree that the issues here require more of a hardware-oriented solution than one in software; ie: 'let's understand the obstacles that the hardware has thrown at us and deal with them in a hardware-appropriate manner rather than the software-is-broken-so-we-write-more-software pseudo-solution'. This is a 'phone dammit, not a desktop/laptop. I have a Nokia 6230i that takes 30 seconds to shake it's head and take a look around when i get off the 'plane, my first mobile was ready in about 3 seconds... Something to do with being more hardware-centric, i guess...
Running at what, 4MHz? this is 2006, not 1986, but i do agree. The point here however, is that parts of the ARM will do this automatically - no coding required. Anyone who has studied chaos will appreciate the beauty of this approach. A bit like four mechanics playing poker until one of the robots on the production line breaks down. They then break into a flurry of activity to repair the machine, at which point, task complete, they return to their cards....
Isn't this the wole point of asyn^h^h^h^hclockless design? The processor is now integrated into our whole, messy, real world?
You must admit, however, that clock=state for most applications. Under many circumstances, straight logic is faster than that. I think that what we are talking about is a series of 'ready' signals, where speed of computation is limited by propagation, rather than by an arbitrary clock...
Pump: $20. Copper pipe: $40. Borer rental: $40. lowering the water table by 60+ metres: irreplaceable at any price read the cover story of the Feb 25th edition of newScientist (dead tree version, not sure if it's online) it just might change your mind.