Analog Kid
Nov 22, 03:28 AM
As a mechanical engineer, I'm not exactly cynical about this application of Eneco's technology, but I remain very, very skeptical. With such a relatively small temperature difference, I would say it is very unlikely that such a device would be economically feasible. A quick visit to Eneco's site shows me that they don't even have lab data for temperature differences of less than 100 deg C!
They obfuscate the issue of efficiency by referring to the Carnot efficiency to inflate the numbers to the uninitiated. Sadi Carnot showed that an ideal heat engine that operated between two infinite reservoirs at temperatures, T(hot) and T(cold) would have an efficiency of ( T(hot)-T(cold) ) / T(hot), and the temperatures have to be on an absolute scale like Kelvin or Rankine. The "Carnot efficiency" compares the performance of the system in question to this ideal heat engine.
Suppose you ran your chip at a very warm 90 deg C (363 K) and could dump the heat to your 25 deg C (298 K) room, your perfect efficiency would be about 18%! This means that for every 5W of heat you dissipate from the chip, you get a little less that 1 W of electric power. Something with an impressive-sounding 50% Carnot efficiency would really have a measly 9% real efficiency.
Unless Eneco sells these things very cheaply and makes them very small, I can't see Apple going through the trouble and expense of adding them to their portables for such a small benefit in recycled power. I remain skeptical, yet open-minded.
Finding efficiency data for temperatures below 100C would be important since the max junction temperature for most processors is below that. Power supply devices max out at about 150C. You just can't get hotter than that and expect silicon to function as a semiconductor.
If the Intel chips burn 100W, then 9% conversion efficiency would generate 9W of electricity. In absolute terms, that's not too bad. You can do a lot with 9W. If you have a 5 hour battery life now, and can use these on all the major power sinks, you'd get 5.5 hours of battery life.
(Those are big "if"s, but putting them in bold seemed a bit too cynical...)
Interesting, but not earth shattering yet... If this became widespread though and we could cut world energy consumption by 10%-- that would be a big deal. Personally, I think there's more to be gained in cars (hotter and less efficient to begin with) than computers, but who knows.
They obfuscate the issue of efficiency by referring to the Carnot efficiency to inflate the numbers to the uninitiated. Sadi Carnot showed that an ideal heat engine that operated between two infinite reservoirs at temperatures, T(hot) and T(cold) would have an efficiency of ( T(hot)-T(cold) ) / T(hot), and the temperatures have to be on an absolute scale like Kelvin or Rankine. The "Carnot efficiency" compares the performance of the system in question to this ideal heat engine.
Suppose you ran your chip at a very warm 90 deg C (363 K) and could dump the heat to your 25 deg C (298 K) room, your perfect efficiency would be about 18%! This means that for every 5W of heat you dissipate from the chip, you get a little less that 1 W of electric power. Something with an impressive-sounding 50% Carnot efficiency would really have a measly 9% real efficiency.
Unless Eneco sells these things very cheaply and makes them very small, I can't see Apple going through the trouble and expense of adding them to their portables for such a small benefit in recycled power. I remain skeptical, yet open-minded.
Finding efficiency data for temperatures below 100C would be important since the max junction temperature for most processors is below that. Power supply devices max out at about 150C. You just can't get hotter than that and expect silicon to function as a semiconductor.
If the Intel chips burn 100W, then 9% conversion efficiency would generate 9W of electricity. In absolute terms, that's not too bad. You can do a lot with 9W. If you have a 5 hour battery life now, and can use these on all the major power sinks, you'd get 5.5 hours of battery life.
(Those are big "if"s, but putting them in bold seemed a bit too cynical...)
Interesting, but not earth shattering yet... If this became widespread though and we could cut world energy consumption by 10%-- that would be a big deal. Personally, I think there's more to be gained in cars (hotter and less efficient to begin with) than computers, but who knows.
gatearray
Apr 5, 10:25 AM
First off, leave my post alone.
Secondly you will see iPad 3 as early as September if competition is stiff. Only if iPad 2 retains major market share will Apple will delay release of iPad 3 until 2012, thus extending revenues from iPad 2.
Wow, you're some kind of business GENIUS! :)
Seriously, though, hell will freeze over before iPad 3 is released in September, or any time whatsoever in 2011. Just let it go, man...
Secondly you will see iPad 3 as early as September if competition is stiff. Only if iPad 2 retains major market share will Apple will delay release of iPad 3 until 2012, thus extending revenues from iPad 2.
Wow, you're some kind of business GENIUS! :)
Seriously, though, hell will freeze over before iPad 3 is released in September, or any time whatsoever in 2011. Just let it go, man...
sterno74
Nov 2, 10:05 AM
I can personally attest to being somebody who just switched to a mac. I've always wanted to own a Mac but didn't want to chance abandoning Windows completely. I'm a gamer and there's a few other apps that just don't exist for Apple that I use. Now I've got a Mac Pro dual booting OSX and XP Pro 64-bit.
It's much easier to justify the switch when you know you can always switch back if you just don't like it.
It's much easier to justify the switch when you know you can always switch back if you just don't like it.
Popeye206
Apr 21, 01:42 PM
Could these be Apples baby-steps into the console Market?
I predict we're going to hear about more than baby steps before the end of the year. If Apple really takes on gaming, it could be really cool with all the devices you could have for interaction and play.
I think we'll hear more from the WDC.
I predict we're going to hear about more than baby steps before the end of the year. If Apple really takes on gaming, it could be really cool with all the devices you could have for interaction and play.
I think we'll hear more from the WDC.
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iJohnHenry
Apr 8, 05:21 PM
That's clever there, that is. ;)
:o I suspect it's an age-related affliction. Curses.
:o I suspect it's an age-related affliction. Curses.
OneMike
Mar 30, 08:53 AM
I drove past a station today; 218.9 NZ cents per litre (US$6.15 per gallon). I remember when it was 90.9...
If my math was right then that would've been about $2.55 US per gallon. I remember that as well and less.
I remember $1.89 in NY and before I moved to FL and use to visit (2002 and up days) gas down here was like $1.17 a gallon.
Now in Miami gas is about $3.69, down from $3.79 a couple days ago.
These prices are all for regular
If my math was right then that would've been about $2.55 US per gallon. I remember that as well and less.
I remember $1.89 in NY and before I moved to FL and use to visit (2002 and up days) gas down here was like $1.17 a gallon.
Now in Miami gas is about $3.69, down from $3.79 a couple days ago.
These prices are all for regular
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appleguy
Jan 6, 08:00 PM
something I noticed its also gone through my address book and linked people to facebook accounts I dont have as friends (on facebook)
some of them are way wrong ie some I know they dont have facebook but its added someone with the same name
some of them are way wrong ie some I know they dont have facebook but its added someone with the same name
lmalave
Oct 17, 06:22 AM
I'm with you. I already catched myself looking up a number in my nano's address book ("contacts") and looking for the "call" item. I'd love to have the main menu going "Music \n Phone \n Phone \n Extras etc." But the nano might actually be a little small for a phone. Try holding one at your ear for a minute. How about an add-on that you plug in on the bottom via the dock connector? Makes the thing a little longer and you can just upgrade your iPod. Kinda like the iTrip, but in the exact same design as the iPod itself.
No way would an iPhone launch without a keypad. Text messaging is too popular. I think it will be a slider phone, though, so they keyboard is tucked away until you need it.
And I don't think the nano length is too short for a phone. My SonyEricsson is the same height as the Nano.
No way would an iPhone launch without a keypad. Text messaging is too popular. I think it will be a slider phone, though, so they keyboard is tucked away until you need it.
And I don't think the nano length is too short for a phone. My SonyEricsson is the same height as the Nano.
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InuNacho
May 5, 04:18 PM
Unless Microsoft is selling me Atari Jaguars they shouldn't tell me to "Do the Math".
tbrinkma
May 2, 07:24 PM
Exactly, whats silly is the "ALL are thicker" or "NONE are thicker" garbage. It's clearly a QA issue Apple is having with the phones...which I think is sad given the time it took for them to release. :(
Yep. Probably an accidental run of back plates made with slightly thicker than spec glass. The difference in thickness is not significant enough that someone is going to notice during the assembly or packaging process, so it wouldn't necessarily have been caught until after shipment.
(I say back plates, because all the side-by-side comparisons have the metal band appearing at the same place in the photos, with only the back to account for the difference in thickness.)
Yep. Probably an accidental run of back plates made with slightly thicker than spec glass. The difference in thickness is not significant enough that someone is going to notice during the assembly or packaging process, so it wouldn't necessarily have been caught until after shipment.
(I say back plates, because all the side-by-side comparisons have the metal band appearing at the same place in the photos, with only the back to account for the difference in thickness.)
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Vantage Point
Mar 19, 05:49 PM
Tiny discounts like that are why people will buy from places like Amazon since even if the price is identical they save much more on the sales tax.
jbourassa
Oct 31, 02:49 PM
Hello. I'm not sure if I'm in the right forum, but I'll post anyway.. ;)
When I read a CD, I hear "tick tick tick tick..." instead of the song. Same thing when I import the songs and read them. It also does the same thing when I read the imported songs from my desktop pc in my Laptop (both PCs btw, im too poor to switch yet. maybe next year). But I can read and import the songs from the CD when I'm on my laptop. Also, I can listen to the songs allright if I import them from my laptopn then send it on my desktop PC.
Any clue? please help me!
(ps : my laptop has 4.6 and my desktop pc has 4.7... And yes i tried to re-install!)
When I read a CD, I hear "tick tick tick tick..." instead of the song. Same thing when I import the songs and read them. It also does the same thing when I read the imported songs from my desktop pc in my Laptop (both PCs btw, im too poor to switch yet. maybe next year). But I can read and import the songs from the CD when I'm on my laptop. Also, I can listen to the songs allright if I import them from my laptopn then send it on my desktop PC.
Any clue? please help me!
(ps : my laptop has 4.6 and my desktop pc has 4.7... And yes i tried to re-install!)
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amols
Sep 27, 12:15 PM
This is going to be the most rockin' update eva!!1
Do you know something we don't ??
Do you know something we don't ??
Liquorpuki
Apr 9, 02:32 PM
Other organizations do that stuff also. The majority of Planned Parenthood's business is abortions.
PS don't Planned Parenthood's origins
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiEA-SldW5mCWPC2Va-cOX-2g-PNw_2nEo07b6b28-2HcpE1IjUqz9uzn3FOjPFCMCCpN5h2ZtDdCz4QOimHID6ow5cGSokC26gPlxkN9NJvg3bT1ICvutESLLq2VRI31JJCDSxfvmh94ze/s400/sanger_kkk.jpg
First other organizations offer abortions as well. So I'm not sure what your logic is getting at.
Second PP was not started by the KKK.
Finally, I don't know if what Abby Johnson is saying is true but if abortions are truly going on at a magnitude that she suggests and PP is illegally funding them, I don't know why she's the only firsthand source.
I dont know how many of you guys actually have firsthand experience with PP and how many are just doing the keyboard jockey thing but I've been in 3 Planned Parenthood waiting rooms. Those places are always packed with women. It'll be raining and the place won't open for another hour and there will still be a line outside. From looking around, I have never seen any woman there with a late term pregnancy. What I did see were a lot of women - usually from high school to mid-20's, lower income, probably no health insurance. Since my high school days, PP has always been the primary resource for testing and/or contraception. Through their counseling, which is actually pretty effective, it's also one of the best resources to learn how to be sexually responsible.
PS don't Planned Parenthood's origins
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiEA-SldW5mCWPC2Va-cOX-2g-PNw_2nEo07b6b28-2HcpE1IjUqz9uzn3FOjPFCMCCpN5h2ZtDdCz4QOimHID6ow5cGSokC26gPlxkN9NJvg3bT1ICvutESLLq2VRI31JJCDSxfvmh94ze/s400/sanger_kkk.jpg
First other organizations offer abortions as well. So I'm not sure what your logic is getting at.
Second PP was not started by the KKK.
Finally, I don't know if what Abby Johnson is saying is true but if abortions are truly going on at a magnitude that she suggests and PP is illegally funding them, I don't know why she's the only firsthand source.
I dont know how many of you guys actually have firsthand experience with PP and how many are just doing the keyboard jockey thing but I've been in 3 Planned Parenthood waiting rooms. Those places are always packed with women. It'll be raining and the place won't open for another hour and there will still be a line outside. From looking around, I have never seen any woman there with a late term pregnancy. What I did see were a lot of women - usually from high school to mid-20's, lower income, probably no health insurance. Since my high school days, PP has always been the primary resource for testing and/or contraception. Through their counseling, which is actually pretty effective, it's also one of the best resources to learn how to be sexually responsible.
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bartolo5
Jun 18, 04:08 AM
This is easily the most factually complete and correct post in this thread. Kudos!
Why did/do we even have dual/tri-band GSM phones or HSPA phones that don't do AWS - especially now in 2010? Is it antenna design? Is it the extra analog front ends needed? Is it just product market segmentation?
Yes, for every band supported in the phone there needs to be an analog amplifier between the antenna and the RF modem. There are also antenna issues. Antennas have to be designed to be tuned to the specific bands, so if you have a pentaband antenna things can get quite tricky. I am an EE although my antenna design skills are quite rusty, it would seem that 850/900 and 1800/1900 should be easy to implement given that a) grouped together they are closed enough bands, and b) they lie in two groups of frequencies that are multiple exactly by 2, giving you an antenna that has to be exactly half of the wavelength and making it easier to design an antenna with a form that resonates on both frequencies. If you throw 2100Mhz things get complicated and if if you add 1700 even more so.
Whatever it is, the frequency bands supported by the phone are not trivial to implement and they are a technical challenge. That's why many times you get different versions of the same phone for different markets with different supported bands. If it was easy to just one phone for all they would do it.
Why did/do we even have dual/tri-band GSM phones or HSPA phones that don't do AWS - especially now in 2010? Is it antenna design? Is it the extra analog front ends needed? Is it just product market segmentation?
Yes, for every band supported in the phone there needs to be an analog amplifier between the antenna and the RF modem. There are also antenna issues. Antennas have to be designed to be tuned to the specific bands, so if you have a pentaband antenna things can get quite tricky. I am an EE although my antenna design skills are quite rusty, it would seem that 850/900 and 1800/1900 should be easy to implement given that a) grouped together they are closed enough bands, and b) they lie in two groups of frequencies that are multiple exactly by 2, giving you an antenna that has to be exactly half of the wavelength and making it easier to design an antenna with a form that resonates on both frequencies. If you throw 2100Mhz things get complicated and if if you add 1700 even more so.
Whatever it is, the frequency bands supported by the phone are not trivial to implement and they are a technical challenge. That's why many times you get different versions of the same phone for different markets with different supported bands. If it was easy to just one phone for all they would do it.
speakerwizard
Jan 6, 03:21 PM
someone explain this to me.....wouldn't activating push notifications absolutely KILL my iPhone 3GS battery life?? I've never been able to figure out if push notifications are bad to turn on cause they drain battery life?
Thanks!
they do a little but not to the extent of background processes, and having 20 push apps takes no more battery life than having 1, unless you get very frequent pushes from them of course.
Thanks!
they do a little but not to the extent of background processes, and having 20 push apps takes no more battery life than having 1, unless you get very frequent pushes from them of course.
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Abstract
Sep 9, 09:46 AM
I'd go sailing. You do claim to live in America's sailing capital.
tmaxxtigger
Mar 11, 10:01 PM
50th in line at Allen BB, but they did not have much left by the time they reached me, mostly white and 3G that not many wanted, bummer. Target and Walmart in the area has little to nothing either.
sportsfan
Jun 10, 03:33 PM
If only they hadn't been such head cases when Steve-O first went to them with the iPhone idea. Just think how far ahead of the competition Apple would be with all those potential subscribers.
Maximillian
Mar 28, 07:31 PM
I'm glad I got my ticket this morning. Holy crap! Less than 12 hours to sell out? That's just insane.
imacintel
Nov 14, 08:47 AM
C'mon...Air Canada? Anybody?
I <3 E190
I <3 E190
Queso
Dec 18, 11:08 AM
There's no "overreaction" in the news, just publicity. Do you honestly think a major record company is going to miss such an opportunity for free advertising?
I like the song BTW. Reminds me of my younger days :)
I like the song BTW. Reminds me of my younger days :)
zombitronic
Mar 26, 03:45 PM
"They're going to see it all eventually so who cares how they get it."
He's obviously talking about the aftermath of the doomsday device.
He's obviously talking about the aftermath of the doomsday device.
JackAxe
Mar 29, 11:03 PM
This is dumb, but blowing on the mic makes the menu items spin faster. I never bought a DSi, so I'm not sure they did anything like that?
+++
Bleh... My SD Card corrupted... OK, never mind. I had to power down my 3DS, then eject the SD card and re-insert it and now it works again.
+++
Bleh... My SD Card corrupted... OK, never mind. I had to power down my 3DS, then eject the SD card and re-insert it and now it works again.
