Rend It
Nov 21, 06:24 PM
... sooo, a thermocouple (http://en.wikipedia.org/wiki/Thermocouple) on a chip? Thermocouples have horrendous efficiency. I don't see how a such a chip in an enclosed environment (like a laptop motherboard) can achieve enough of a thermal gradient to produce enough current to be useful.
I dunno, i'm skeptical.
Skeptical you should be, but these aren't really thermocouples. The same physical principle applies, but thermocouples are really only for temperature measurement. These are thermoelectric coolers. See here (http://en.wikipedia.org/wiki/Peltier-Seebeck_effect).
If you want to power the temperature change yourself, you need a high current. But if you want to generate electricity from them, then just connect them into a circuit with out any powersupply i.e. stick a fan's power terminals on that, stick one side of the TEC on a hot chip or cup of tea etc. to setup the delta T. (temp difference) then the fan will start spinning!
Dan :-)
While what you're saying is true in principle, I seriously doubt the practicality of what you're suggesting. TECs are moderately efficient at converting electricity into a temperature differential (or being used as a heat pump), but their efficiency in the other mode of operation (Seebeck effect) is very, very low (typ. < 5%). If you take a chip-sized (~ 1 cm^2) TEC, connect it between a hot processor core at 100 C and ambient temperature at 25 C, you will not have enough power to turn a computer fan at any modest speed. Furthermore, even if you could harvest that electricity and store it, the added energy would be less than 0.1% of a typical laptop battery. :rolleyes:
If you wanted to use a larger TEC module (say 16 cm^2) on top of the 80 C CPU case, then the added energy would be less than 1%.
Estimates based on info here (http://www.ferrotec.com/technology/thermoelectric/thermalRef13.php).
I dunno, i'm skeptical.
Skeptical you should be, but these aren't really thermocouples. The same physical principle applies, but thermocouples are really only for temperature measurement. These are thermoelectric coolers. See here (http://en.wikipedia.org/wiki/Peltier-Seebeck_effect).
If you want to power the temperature change yourself, you need a high current. But if you want to generate electricity from them, then just connect them into a circuit with out any powersupply i.e. stick a fan's power terminals on that, stick one side of the TEC on a hot chip or cup of tea etc. to setup the delta T. (temp difference) then the fan will start spinning!
Dan :-)
While what you're saying is true in principle, I seriously doubt the practicality of what you're suggesting. TECs are moderately efficient at converting electricity into a temperature differential (or being used as a heat pump), but their efficiency in the other mode of operation (Seebeck effect) is very, very low (typ. < 5%). If you take a chip-sized (~ 1 cm^2) TEC, connect it between a hot processor core at 100 C and ambient temperature at 25 C, you will not have enough power to turn a computer fan at any modest speed. Furthermore, even if you could harvest that electricity and store it, the added energy would be less than 0.1% of a typical laptop battery. :rolleyes:
If you wanted to use a larger TEC module (say 16 cm^2) on top of the 80 C CPU case, then the added energy would be less than 1%.
Estimates based on info here (http://www.ferrotec.com/technology/thermoelectric/thermalRef13.php).
jbembe
Oct 9, 10:19 PM
In fact, DVD pricing is not the most important factor for Walmart and I suspect Target as well. Both companies employ sophisticated marketing techniques to draw customers into the store and get them to part with more money than they originally intended to spend. Brand-name promotions, item placements and even Walmart's "don't ask, don't tell" return policies are examples. The use of loss-leaders, selling products at a small loss, has proven to be one of the most powerful customer draws. DVDs are the numero-uno loss leader draw of most Walmarts, particularly those in the broad midsection of the country where it's often difficult to find a video rental store, much less a Tower, Borders or Virgin Atlantic store. I recently spent the summer in the Hill Country of Texas and became quite familiar with the Friday evening surge when customers would stream into a Walmart to pick up a DVD for the weekend and then decide to do a little additional shopping "seein' as they was there." I think the stores are rightfully fearful of the loss in foot traffic and the consequential loss of impulse purchases if movie downloads become popular. For the same reason, simply openning up an online store will not insulate them from losses since the profits accrued from DVD sales don't generally arise from the DVDs themselves, but from the additional shopping that is all but inevitable once you enter the store.
Yep, it's similar in Best Buy and other places with the weeks newest CD releases. Normally a few CDs are on a really good sale and others are not so competitively priced. Good thing I can control my impulses... for the most part.
Anyway, unlike my CD collection, I would be quite happy with a terrabyte unit to store all of my movies so I could just scroll through some list on the remote and playback any given movie for the evening-- or download something new. When the iService gives that to us, it will be quite nice.
Yep, it's similar in Best Buy and other places with the weeks newest CD releases. Normally a few CDs are on a really good sale and others are not so competitively priced. Good thing I can control my impulses... for the most part.
Anyway, unlike my CD collection, I would be quite happy with a terrabyte unit to store all of my movies so I could just scroll through some list on the remote and playback any given movie for the evening-- or download something new. When the iService gives that to us, it will be quite nice.
bick
Mar 26, 04:33 PM
I believe this is a side street, not University. Looks like a cafe on Bryant.
Also, Steve wears the same close because he has better things to think about in the morning than what to wear. That's my understanding. Hell, I wear the same thing for the same reason.
Also, Steve wears the same close because he has better things to think about in the morning than what to wear. That's my understanding. Hell, I wear the same thing for the same reason.
jimN
Oct 26, 06:51 PM
Gutted I didn't get a free T-Shirt, they were all sold out when I got in. I arrived earlier than expected, pretty much bang on 6. An Apple Store employee came out and told us we were queuing in the wrong bit, it was at that point everyone realized the queue went round the entire block!
Installing Leopard as we speak, only just got in, spent all night at the Studio talking! (Apologies to the friendly Apple employees my friend and I were talking to all night propping up the bar!).
Dam tubes getting slower at night time!
Was quite interesting seeing the diversity, I enjoyed it, just wish I had a T-shirt.
Was there much chatting in the line or were people keeping themselves to themselves?
Installing Leopard as we speak, only just got in, spent all night at the Studio talking! (Apologies to the friendly Apple employees my friend and I were talking to all night propping up the bar!).
Dam tubes getting slower at night time!
Was quite interesting seeing the diversity, I enjoyed it, just wish I had a T-shirt.
Was there much chatting in the line or were people keeping themselves to themselves?
more...
lordonuthin
Apr 16, 06:56 PM
do you ever use these stats? (http://folding.extremeoverclocking.com/team_summary.php?s=&t=3446)
you can see other individuals also. and see how you rank against them.
I do now, for some reason it takes me a while to understand when I look at it.
yes we do need more users. 1,000 users @ 100 ppd is 100,000 ppd. whiterabbit is doing almost that by himself!
Ha ha, yes we could use some more folders.
you can see other individuals also. and see how you rank against them.
I do now, for some reason it takes me a while to understand when I look at it.
yes we do need more users. 1,000 users @ 100 ppd is 100,000 ppd. whiterabbit is doing almost that by himself!
Ha ha, yes we could use some more folders.
Tomorrow
Feb 23, 03:47 PM
Like this?
http://solarsystem.nasa.gov/multimedia/gallery/PIA03149.jpg
http://solarsystem.nasa.gov/multimedia/gallery/PIA03149.jpg
more...
dcv
Oct 24, 08:17 AM
Or should that be the Leopard Lounge ;-) http://www.leopard-lounge.com/
Haha, fantastic suggestion :D
Haha, fantastic suggestion :D
amols
Nov 22, 12:02 AM
Wouldn't using the "extra" electricity to power fans to decrease heat lead to less "extra" electricity???? :rolleyes: I hope they really think this through - and I'm sure they will. Of course powering fans isn't the only use for electricity.
LOL!! Good one. They'll cool the chip which will produce less electricity which will slow the fans and produce more heat which will make more electricity to speed up fans to cool the chip which will....:confused: :eek:
LOL!! Good one. They'll cool the chip which will produce less electricity which will slow the fans and produce more heat which will make more electricity to speed up fans to cool the chip which will....:confused: :eek:
more...
Stella
Apr 5, 10:50 AM
The u.s had the opportunity to thrive, especially after the cold war, but instead the country decided it would focus itself on wars, and therefore continue to spend more money than it could afford. This worked itself through the economy ( greed - irresponsible loans, derivatives ( which are a total con ) etc which lead to the banking crisis didn't help ), and now the u.s finds itself in the pits.
Hey, you had the potential but you decided to throw it all away...
Hey, you had the potential but you decided to throw it all away...
CaoCao
Apr 9, 08:49 PM
I'd welcome your examination of the PP that backs your assertion.
It is so much easier to abort than to raise a child.
No, the point of PP is to give the tools and education to prevent pregnancy and disease. Abortion is a service offerred when there is an unwanted pregnancy.
My friend, there is nothing easy about abortion.
Are you suggesting it is harder to abort than to raise a child?
It is so much easier to abort than to raise a child.
No, the point of PP is to give the tools and education to prevent pregnancy and disease. Abortion is a service offerred when there is an unwanted pregnancy.
My friend, there is nothing easy about abortion.
Are you suggesting it is harder to abort than to raise a child?
more...
Westacular
Mar 23, 05:31 PM
While they're at it, why don't they just integrate the whole Apple TV GUI into the TV and get rid of the crappy TV GUIs?
Motorola ROKR.
It's conceivable that they'd license AirPlay because, well, on the display end, it's simple and doesn't involve an interface. It's like plugging in a screen or speakers, only wireless. But there's no way in hell Apple is going to leave any aspect of the rest of the "Apple TV" user experience in another manufacturer's hands. Not again, and not when they can sell the Apple TV for only $100. If the interface shows an Apple logo and lets your browse your iTunes library, it's going to be a 100% Apple product.
Motorola ROKR.
It's conceivable that they'd license AirPlay because, well, on the display end, it's simple and doesn't involve an interface. It's like plugging in a screen or speakers, only wireless. But there's no way in hell Apple is going to leave any aspect of the rest of the "Apple TV" user experience in another manufacturer's hands. Not again, and not when they can sell the Apple TV for only $100. If the interface shows an Apple logo and lets your browse your iTunes library, it's going to be a 100% Apple product.
EricNau
Feb 18, 01:50 PM
MODERATOR NOTE
Many posts and responses in this thread have been removed for violating the Forum Rules.
A quick reminder: please avoid replying to posts that break the rules. Doing so increases its exposure, encourages offenders to continue, and makes more work for the moderators. This translates to slower response times. Instead, report the post using the "report post" button (http://guides.macrumors.com/images/b/b7/Report.gif) to the left of each post. Thanks.
Many posts and responses in this thread have been removed for violating the Forum Rules.
A quick reminder: please avoid replying to posts that break the rules. Doing so increases its exposure, encourages offenders to continue, and makes more work for the moderators. This translates to slower response times. Instead, report the post using the "report post" button (http://guides.macrumors.com/images/b/b7/Report.gif) to the left of each post. Thanks.
more...
lolnick
Mar 11, 03:05 PM
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)
Northpark isn't doing any cards
Northpark isn't doing any cards
gingerbreadboy
Nov 21, 06:27 PM
first post!
i'm working on my ph.d. in applied physics and our lab researches thermoelectric materials. there is no known material yet that is 30 % efficient, as the article claims. the most common material used in refrigerators (Bi2Te3) is only ~ 5 % efficient. a lot of money is being poured into this field to increase the efficiency, but so far the enhancement has been incremental. companies like general motors want to use the seebeck effect of thermoelectric materials to convert waste heat in automobiles back into electricity. 60% of the energy generated from gas is wasted as heat. NASA has been using thermoelectrics for years as RTG's to power deep space probes. i'd love one to be in my laptop, but the efficiency is being overstated here. it's suspicious. and the small dT values from the chip to the air would also be small, so very little voltage could be generated. although, i heard a rumor that some companies were looking into powering a liquid metal (InGa) liquid coolant system with the computers own waste heat. who knows.
i'm working on my ph.d. in applied physics and our lab researches thermoelectric materials. there is no known material yet that is 30 % efficient, as the article claims. the most common material used in refrigerators (Bi2Te3) is only ~ 5 % efficient. a lot of money is being poured into this field to increase the efficiency, but so far the enhancement has been incremental. companies like general motors want to use the seebeck effect of thermoelectric materials to convert waste heat in automobiles back into electricity. 60% of the energy generated from gas is wasted as heat. NASA has been using thermoelectrics for years as RTG's to power deep space probes. i'd love one to be in my laptop, but the efficiency is being overstated here. it's suspicious. and the small dT values from the chip to the air would also be small, so very little voltage could be generated. although, i heard a rumor that some companies were looking into powering a liquid metal (InGa) liquid coolant system with the computers own waste heat. who knows.
more...
pyramid6
Oct 9, 04:33 PM
Walmart:
http://www.walmart.com/catalog/product.do?product_id=5147600
Target:
http://www.target.com/gp/detail.html/sr=8-24/qid=1160429340/ref=sr_8_24/602-3051215-3759835?%5Fencoding=UTF8&asin=B00005JNS0
iTunes:
Not sure how to link, but it is $12.99
I'm just sayin'.
http://www.walmart.com/catalog/product.do?product_id=5147600
Target:
http://www.target.com/gp/detail.html/sr=8-24/qid=1160429340/ref=sr_8_24/602-3051215-3759835?%5Fencoding=UTF8&asin=B00005JNS0
iTunes:
Not sure how to link, but it is $12.99
I'm just sayin'.
davidjearly
Dec 18, 11:03 AM
But that's just the thing, it's not serious. At least I don't think so. A bigger deal has been made of it in this thread talking to you than any other place I've encountered. How's that for irony?
Well I've not yet appeared in the news. Note that when I talk about the rebellious crowd, I'm referring to more than just you and the peopl in this thread. There has been a total overreaction to it in the news and by 'celebrities' over the country. In any case, that's not irony.
Some time in the future when past christmas number ones are played I'll get a little smile when I hear 2009's.
I sincerely hope not. I'd rather have anything other than a poor metal track being played continually on the radio over the festive period.
Well I've not yet appeared in the news. Note that when I talk about the rebellious crowd, I'm referring to more than just you and the peopl in this thread. There has been a total overreaction to it in the news and by 'celebrities' over the country. In any case, that's not irony.
Some time in the future when past christmas number ones are played I'll get a little smile when I hear 2009's.
I sincerely hope not. I'd rather have anything other than a poor metal track being played continually on the radio over the festive period.
more...
strausd
Apr 10, 10:53 PM
Right now I have a 5870 running a 24" ACD and a Dell u2311h. I also have a TV that I want to to be hooked up, but right now I don't have an active adapter for it, but I do have an active one for the MDP to single link DVI. If I ever want to hook up the TV right now, the u2311h won't work. So I was thinking of getting another Dell u2311h and hooking that up to the 5870 with the active adapter. Then I was thinking of getting a cheap gt 120 just for the TV. I am not sure how will this would work and I would also like to get some of y'alls opinions.
yetanotherdave
Nov 6, 05:37 AM
You already use cards, which are trackable, stop whining, give us the option for ultra convenience, They'll still let you pay in cash if you choose!
dampfnudel
Apr 21, 01:58 PM
Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_3_2 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8H7 Safari/6533.18.5)
Did Apple do this last year? If not, this could mean Apple really wants developers to give users who purchase the next iPhone an enhanced experience over iPhone 4 users. What that enhanced experience is remains to be seen. Maybe 1GB of ram and something else that will make some iPhone 4 users jealous, especially when their iPhone 4 turns into an iPhone 3G someday.
Did Apple do this last year? If not, this could mean Apple really wants developers to give users who purchase the next iPhone an enhanced experience over iPhone 4 users. What that enhanced experience is remains to be seen. Maybe 1GB of ram and something else that will make some iPhone 4 users jealous, especially when their iPhone 4 turns into an iPhone 3G someday.
garybUK
Mar 24, 08:35 AM
I can't tell if you're feigning ignorance in the interest of having a laugh, or if you have really bought into the ol' stereotypes. Or maybe my sarcasm detector is broken.
1. Did you know Honda, Toyota, Hyundai, Mercedes-Benz, and BMW all manufacture cars in the USA?
1. Did you know Honda, Toyota, Hyundai, Mercedes-Benz, and BMW all manufacture cars in the USA?
Jason Beck
Apr 7, 04:49 PM
Woz drank the bongwater.
BBCWatcher
Jun 11, 02:11 PM
AWS-1 (a.k.a. UMTS Band IV) is a standard in the U.S. and Canada. I think Japan has also allocated AWS-1 (to eMobile). It is constructed out of two parts: 1710 to 1755 MHz and 2110 to 2155 MHz. Devices which support AWS-1 are commonly labeled "1700." Quite simply, that's the spectrum that was available to put up for auction. T-Mobile and Wind Mobile either could bid on that spectrum and use it for 3G service or not. Mobile device manufacturers can now produce AWS frequency products if they want to sell through these carriers or not. It's Apple's choice whether to play or pass.
Years ago, European nations did not adopt the same frequency allocations that the U.S. did for the world's first cellular service (824-849 MHz paired with 869-894 MHz). It's hardly unusual that different groups of countries have different allocations, primarily because of existing services that were already licensed but also occasionally for political reasons.
There are all kinds of variations in spectrum allocations between countries and regions. The U.S. has allocated spectrum in the 700+ MHz range for LTE services (which Verizon in particular plans to use). Europe and Asia use 2100+ MHz for 3G while the U.S. doesn't. Europe has allocated 900+ MHz and 1800+ MHz spectrum to GSM (and now some 3G) while the U.S. has allocated the AMPS (824-849/869-894) and 1900+ MHz ranges. AWS-1 is just another set of frequencies which Apple either will or won't support.
If Apple does support AWS-1, it would significantly improve the compatibility of their products in North America. It isn't a particularly difficult engineering issue. (Fairly trivial, actually.) Nokia has already done so with the N8 which supports GSM/EDGE on 850/900/1800/1900 and 3G on 850/900/1700/1900/2100.
Years ago, European nations did not adopt the same frequency allocations that the U.S. did for the world's first cellular service (824-849 MHz paired with 869-894 MHz). It's hardly unusual that different groups of countries have different allocations, primarily because of existing services that were already licensed but also occasionally for political reasons.
There are all kinds of variations in spectrum allocations between countries and regions. The U.S. has allocated spectrum in the 700+ MHz range for LTE services (which Verizon in particular plans to use). Europe and Asia use 2100+ MHz for 3G while the U.S. doesn't. Europe has allocated 900+ MHz and 1800+ MHz spectrum to GSM (and now some 3G) while the U.S. has allocated the AMPS (824-849/869-894) and 1900+ MHz ranges. AWS-1 is just another set of frequencies which Apple either will or won't support.
If Apple does support AWS-1, it would significantly improve the compatibility of their products in North America. It isn't a particularly difficult engineering issue. (Fairly trivial, actually.) Nokia has already done so with the N8 which supports GSM/EDGE on 850/900/1800/1900 and 3G on 850/900/1700/1900/2100.
DaveGee
Apr 16, 03:39 PM
Is it me or is Apple becoming a silly caricature of its own 1984 ad?
If when you say silly you mean terrifying? Then yes I do... :mad:
If when you say silly you mean terrifying? Then yes I do... :mad:
peharri
Aug 14, 01:22 PM
...if you're selling soap.
If you're selling computer platforms though, it's a major mistake. The days of the Amiga may be long behind us, but people do still feel strongly about their choice of computer, they do become personally attached to what they got, and this isn't like the car industry where there are so many manufacturers you can do a little spoofing of your competitors without anyone feeling it's directed at them.
Car analogies are old hat so if you'll forgive me, I'll use a sports analogy instead. I don't really know sports, except to know that fans of teams tend to be just as irrational as fans of computer platforms. By which I mean the entire spectrum of fandom tends to be represented. But everyone does, in the end, whether it's a team or a computer platform, end up opinionated and either loving or hating it.
Imagine the following. You're Apple's ad agency, and you've been hired by the Reds, the local sports team. A few miles away is the home of the Blues, and in your town, the Reds make up the team affiliation of about 80% of the population, with the Blues making up the other 20%. There's a degree of rivalry between the teams.
The Reds want more people coming to their stadiums. They need increased revenue ticket sales. The only people to attract now are the Blues. The Blues obviously like your sport, otherwise they wouldn't have chosen a team in the first place, but they're not willing to consider, as yet, seeing Red team games. How do you attract Blue supporters?
If you're Apple's ad agency, your ad goes something like:
Blue: "I'm a blue player"
Red: "And I'm a red player"
Blue: "Duh. I can kick this ball, duh, look" (*kicks at ball several times, finally actually hitting it the 7th time*)
Red: *smugly bounces a ball on knee* "Red scored the highest last season, and we're consistantly the best team"
Blue: "Hey! Hey, watch this" *attempts to balance ball on nose, ball consistantly rolling off and away. Blue chases after ball*
Red: *Kicks ball up, bounces on knee, headbutts it, and catches it with one hand behind him* "We have some really skilled players"
(Ad continues ad-nausium. By which I mean it's an ad that makes you nauseous.)
Now, another approach might be to run an ad that consists of a bunch of shots from your stadium. You show some pretty good playing, stuff people will find impressive and will have wished they saw. You show the Reds most often, but, hey, there are two teams in every game. In other words, instead of taking sides based upon the team, you show people that if they come to your stadium, they're going to have a good time. They're going to see some impressive playmanship. Even if it's not their team, there's reason for them to want to go and see the next game.
Which type of ad would sway you? Which type of ad would get you to go to a stadium owned by your team's rival?
The current "I'm a Mac" series doesn't work because it appeals to fanboism, but in doing so, it also ends up being fanboism's victim. It doesn't appeal to PC owners, it just cements existing Mac user's sense of superiority. Except me. I cringe every time I see them.
If you're selling computer platforms though, it's a major mistake. The days of the Amiga may be long behind us, but people do still feel strongly about their choice of computer, they do become personally attached to what they got, and this isn't like the car industry where there are so many manufacturers you can do a little spoofing of your competitors without anyone feeling it's directed at them.
Car analogies are old hat so if you'll forgive me, I'll use a sports analogy instead. I don't really know sports, except to know that fans of teams tend to be just as irrational as fans of computer platforms. By which I mean the entire spectrum of fandom tends to be represented. But everyone does, in the end, whether it's a team or a computer platform, end up opinionated and either loving or hating it.
Imagine the following. You're Apple's ad agency, and you've been hired by the Reds, the local sports team. A few miles away is the home of the Blues, and in your town, the Reds make up the team affiliation of about 80% of the population, with the Blues making up the other 20%. There's a degree of rivalry between the teams.
The Reds want more people coming to their stadiums. They need increased revenue ticket sales. The only people to attract now are the Blues. The Blues obviously like your sport, otherwise they wouldn't have chosen a team in the first place, but they're not willing to consider, as yet, seeing Red team games. How do you attract Blue supporters?
If you're Apple's ad agency, your ad goes something like:
Blue: "I'm a blue player"
Red: "And I'm a red player"
Blue: "Duh. I can kick this ball, duh, look" (*kicks at ball several times, finally actually hitting it the 7th time*)
Red: *smugly bounces a ball on knee* "Red scored the highest last season, and we're consistantly the best team"
Blue: "Hey! Hey, watch this" *attempts to balance ball on nose, ball consistantly rolling off and away. Blue chases after ball*
Red: *Kicks ball up, bounces on knee, headbutts it, and catches it with one hand behind him* "We have some really skilled players"
(Ad continues ad-nausium. By which I mean it's an ad that makes you nauseous.)
Now, another approach might be to run an ad that consists of a bunch of shots from your stadium. You show some pretty good playing, stuff people will find impressive and will have wished they saw. You show the Reds most often, but, hey, there are two teams in every game. In other words, instead of taking sides based upon the team, you show people that if they come to your stadium, they're going to have a good time. They're going to see some impressive playmanship. Even if it's not their team, there's reason for them to want to go and see the next game.
Which type of ad would sway you? Which type of ad would get you to go to a stadium owned by your team's rival?
The current "I'm a Mac" series doesn't work because it appeals to fanboism, but in doing so, it also ends up being fanboism's victim. It doesn't appeal to PC owners, it just cements existing Mac user's sense of superiority. Except me. I cringe every time I see them.
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