I have the same issue with my old windows HTC smartphone. However I'm able to call and undo the data plan upgrade because old smartphones are grandfathered into the non-data plan options. I remember seeing some literature on this 3 or 4 years ago. Try this with a modern smartphone - I don't think they'll be so courteous and downgrade your plan.
Like growing GaN on Si? Is this the breakthrough you are looking for? There are many companies offering GaN on large area Si. Nothing really holding this back.
Starfall looks like a great site. Thanks! I just played with my 3 year old and she loves it. She's so excited now she won't go to bed!
I think there are too many comments so far about sending your kid outside or buying physical toys. I think those comments are unrealistic or irrelevant. Of course your kid should go outside but what do they do after 5pm. Sure she has a room full of toys that she plays with. Dolls, toyhouse, legos, paint, clay, etc. But I want my kid to read as well.
Well-made software like this has built a strong desire for my daughter to read at 3 years old. Even reading books to her every night since she was 10 months old has not created as strong as a desire.
There is some great windows software as well - reader rabbit, key skills, and jumpstart. I like the software better than flash websites - for the younger kids you don't have to worry about them mis-clicking on the start menu, back button, etc. Just a minute ago my daughter right-clicked and was sitting at the adobe flash website wondering what to do next.
Thank you for some real data - instead of all the complaints "isn't it so obvious it's bad with chemicals, water, transport, blah blah blah".
It seems like we are pretty close to paper being a sequestration source.
Don't you think with technology improvements, avoiding certain bleaching and cleaning steps, and more efficient transportation it can cause a net reduction.
I'm sorry, this is not a very convincing argument.
This is not a statistically significant, rigorous accelerated life test. These are standard use conditions, over a short period of time, taken with a population of 1.
From the anecdotal evidence just in these comments alone, CFL clearly have a very large distribution of failures. Maybe the MTF is accurate but the distribution or log-sigma is very large. I have had 4 fail within weeks and they are used 'appropriately'. I have never had incandescents fail in this way.
Yes I may have cheap bulbs. But they still have a long rated MTTF values listed on the box.
Sure, maybe the ones that do last will survive several million hours. I can say nothing about the MTTF, but clearly there is a very large distribution of failures which suggest very high early-failure rates. You really need to see the failure distribution statistics to determine how they came up with these lifetime numbers.
The blog post does not mention a quantitative, rigorous reliability study. With regards to the topic in question, I don't think it is any more informative than feedback from the random average slashdotter.
They've proven that standard mirror materials will ablate and burn up very quickly with this laser power. Even rotating the missile does not help. The missile body still heats up significantly.
The laser optics in the airborne laser probably have to be made out of narrow band reflectors which in practice can be made more than 99.999% reflective to a laser. It would be easy to slightly change the laser wavelength and optics (a few nm's perhaps) and the missile would absorb again.
The reason Cree is so successful is the thermal conductivity of the substrate. Most vendors use sapphire and some do use Si. Look up the difference in thermal conductivity between sapphire, silicon and SiC.
SiC = 370W/mK, Si = 130W/mK, Sapphire=42W/mK
If you can run the LED cooler for the same input power the diode will be more efficient. This is why SiC based LEDs run better and more reliably.
Si substrate GaN LEDs have been around for years they just aren't very good. And it has nothing to do with cracking.
Commercial GaN on Silicon has been available for a years now. The commercial vendors have overcome this cracking problem due to thermal expansion using an AlGaN buffer since about 2005. One problem growing on Silicon is dislocations which limit lifetime, not cracking.
Actually sapphire substrates surprisingly are not that expensive.
I'm not sure why this press release is considered news.
Please remove the Shuji Nakamura tags. Nakamura improved reliability of blue GaN lasers and LEDs. He did not even work on red, yellow, green LEDs which do not use GaN.
Why is controlling speed so precisely more efficient? You are always throttling in order overcome friction, why does your car care about the exact speed?
No, traffic lights are not GaN based. They are GaAs and GaP based. Except maybe in Japan where green lights are blue. GaAs/GaP is much cheaper and cover the spectrum from green, yellow and red.
There is probably no SiO2 under the gates. They say high-K which is either SiON or HfO2. The gate dielectric is much thicker than the equivalent SiO2 gate dielectric.
Of course it is still thin, and still prone to leakage.
I haven't used a trackball in a while, but one problem I had was clicking while navigating with ball. Your hand has to move over the ball while the buttons are fixed.
With a mouse the buttons are locked to the motion of your hand.
Also my RSI comes from the muscles in the back of my hand, not my wrist. The trackball makes me hold my hand even higher with nothing to rest on.
The units are *not* correct. The article is referring to THz wavelenghts in general (30-300um's) not the "two lasers". 3-30nm would be X-rays and GaAs is not creating X-rays.
In fact there is not two lasers at all, that is not how a QCL works. The blurb is not correct. You need frequency mixing to actually measure THz waves, but you don't use frequency mixing to get THz lasing in GaAs QCLs.
Slashdot Mirror
Anyone know of one these ad-blocker-blocked websites? I'd like to see what it looks like in the face of adblock plus + noscript + requestpolicy.
If you look up the Hide My AdBlocker extension from chrome it lists about 15 of these sites. I tried one and I couldn't get through the second page.
I have the same issue with my old windows HTC smartphone. However I'm able to call and undo the data plan upgrade because old smartphones are grandfathered into the non-data plan options. I remember seeing some literature on this 3 or 4 years ago. Try this with a modern smartphone - I don't think they'll be so courteous and downgrade your plan.
Imagine a windy day in a crowded parking lot. That would be pretty annoying. Maybe a mechanical noise maker connected the tires would be better.
Like growing GaN on Si? Is this the breakthrough you are looking for? There are many companies offering GaN on large area Si. Nothing really holding this back.
Starfall looks like a great site. Thanks! I just played with my 3 year old and she loves it. She's so excited now she won't go to bed!
I think there are too many comments so far about sending your kid outside or buying physical toys. I think those comments are unrealistic or irrelevant. Of course your kid should go outside but what do they do after 5pm. Sure she has a room full of toys that she plays with. Dolls, toyhouse, legos, paint, clay, etc. But I want my kid to read as well.
Well-made software like this has built a strong desire for my daughter to read at 3 years old. Even reading books to her every night since she was 10 months old has not created as strong as a desire.
There is some great windows software as well - reader rabbit, key skills, and jumpstart. I like the software better than flash websites - for the younger kids you don't have to worry about them mis-clicking on the start menu, back button, etc. Just a minute ago my daughter right-clicked and was sitting at the adobe flash website wondering what to do next.
Thank you for some real data - instead of all the complaints "isn't it so obvious it's bad with chemicals, water, transport, blah blah blah".
It seems like we are pretty close to paper being a sequestration source.
Don't you think with technology improvements, avoiding certain bleaching and cleaning steps, and more efficient transportation it can cause a net reduction.
Isn't this an opportunity and not a problem?
How is this extremely user friendly. How can you find your files? It depends on the application service you used?
Doesn't sound very intuitive it sounds a little complicated.
I'm sorry, this is not a very convincing argument.
This is not a statistically significant, rigorous accelerated life test. These are standard use conditions, over a short period of time, taken with a population of 1.
From the anecdotal evidence just in these comments alone, CFL clearly have a very large distribution of failures. Maybe the MTF is accurate but the distribution or log-sigma is very large. I have had 4 fail within weeks and they are used 'appropriately'. I have never had incandescents fail in this way.
Yes I may have cheap bulbs. But they still have a long rated MTTF values listed on the box.
Sure, maybe the ones that do last will survive several million hours. I can say nothing about the MTTF, but clearly there is a very large distribution of failures which suggest very high early-failure rates. You really need to see the failure distribution statistics to determine how they came up with these lifetime numbers.
The blog post does not mention a quantitative, rigorous reliability study. With regards to the topic in question, I don't think it is any more informative than feedback from the random average slashdotter.
I suppose it is interesting nonetheless.
They've proven that standard mirror materials will ablate and burn up very quickly with this laser power. Even rotating the missile does not help. The missile body still heats up significantly.
The laser optics in the airborne laser probably have to be made out of narrow band reflectors which in practice can be made more than 99.999% reflective to a laser. It would be easy to slightly change the laser wavelength and optics (a few nm's perhaps) and the missile would absorb again.
Do you have to include the 'I'???
For decades LEDs have been inorganic and made from semiconductors.
Organic LEDs are the recent exception from the norm.
The reason Cree is so successful is the thermal conductivity of the substrate. Most vendors use sapphire and some do use Si. Look up the difference in thermal conductivity between sapphire, silicon and SiC.
SiC = 370W/mK, Si = 130W/mK, Sapphire=42W/mK
If you can run the LED cooler for the same input power the diode will be more efficient. This is why SiC based LEDs run better and more reliably.
Si substrate GaN LEDs have been around for years they just aren't very good. And it has nothing to do with cracking.
Commercial GaN on Silicon has been available for a years now. The commercial vendors have overcome this cracking problem due to thermal expansion using an AlGaN buffer since about 2005. One problem growing on Silicon is dislocations which limit lifetime, not cracking.
Actually sapphire substrates surprisingly are not that expensive.
I'm not sure why this press release is considered news.
Please remove the Shuji Nakamura tags. Nakamura improved reliability of blue GaN lasers and LEDs. He did not even work on red, yellow, green LEDs which do not use GaN.
Of course. Everything at a finite temperature emits radiation. Even a black hole. We are talking about ionizing radiation.
Why is controlling speed so precisely more efficient? You are always throttling in order overcome friction, why does your car care about the exact speed?
I am assuming that the majority of "white" LEDs are made using blue LEDs with a phosphor.
Yes I know the uses for GaAs. I work with GaAs (as well as GaN) everyday in California. I am a little nervous about this law.
High speed electronics such as cell phone PAs are also made using GaAs.
No, traffic lights are not GaN based. They are GaAs and GaP based. Except maybe in Japan where green lights are blue. GaAs/GaP is much cheaper and cover the spectrum from green, yellow and red.
White LEDs are made of Gallium Nitride not Gallium Arsenide. It's the Arsenic in GaAs that is a carcinogen.
Thank you, that makes more sense.
However, isn't a flash lamp (RTA) the standard process?
I could not follow your explanation of "advanced activation techniques".
I took that to mean activation of dopants for very thin channels.
There is probably no SiO2 under the gates. They say high-K which is either SiON or HfO2. The gate dielectric is much thicker than the equivalent SiO2 gate dielectric. Of course it is still thin, and still prone to leakage.
I haven't used a trackball in a while, but one problem I had was clicking while navigating with ball. Your hand has to move over the ball while the buttons are fixed.
With a mouse the buttons are locked to the motion of your hand.
Also my RSI comes from the muscles in the back of my hand, not my wrist. The trackball makes me hold my hand even higher with nothing to rest on.
The units are *not* correct. The article is referring to THz wavelenghts in general (30-300um's) not the "two lasers". 3-30nm would be X-rays and GaAs is not creating X-rays. In fact there is not two lasers at all, that is not how a QCL works. The blurb is not correct. You need frequency mixing to actually measure THz waves, but you don't use frequency mixing to get THz lasing in GaAs QCLs.