From TFS: "shrinking a transistor measurement to... 5 nm -- from 7nm."
These node names have long lost their correspondence to actual dimensions on a chip. For 7 nm (easier to find data on than 5 nm) the transistor density is 60-80 transistors per square m, about 120 nm for a square transistors.
How do motorcyclists in North America prevent hearing damage if they are not allowed to wear earplugs? Wind noise at highway speeds can reach 110+ dB (A) on a bike without wind screen.
If they used many radio telescopes across the world as a phase array, one should be aware that the imaging properties are very different from optical lenses; it's a bit like taking a big optical telescope mirror and painting most of the surface black except a few small specks. You get a good resolution for objects in front of the telescope, but you'll also image objects at different angles and you can't tell them apart.
V^2 scaling for fuel burn rate (I assume that's what you mean) means that the fuel consumption per distance scales as V^1, though. That helps, but not dramatically.
Is it that simple? (And do you mean losses per time or losses per distance covered?) I'd think the efficiency of turbofan engines and airplanes is a great deal more complicated than "drag scales as v-cubed", which you would use for a car. At lower velocities, a plane needs a different wing angle to maintain lift; with lower fuel consumption, there's less fuel mass to carry; each engine has a different thrust/velocity/fuel consumption curve.
The biggest gain comes from those huge high-bypass engines, the ones that didn't fit under the 737MAX wings. They need slightly lower air speeds than the old jet engines.
Patents are country-specific; a single patentable idea can become 150-ish patents for world-wide coverage. This number could represent as few as 160 unique patentable ideas.
Calling it a money grab is a bit too strong, but I'd be more willing to donate if they made it more clear what it's used for. (I did donate a few times.)
It's not clear whether it's a non-profit organization or a company. I have no idea how many person- hours they put in and how much they get paid.
The donations over 2018 totalled about $140k. Other sources of income are not disclosed. - https://linuxmint.com/donors.p... - Is that a lot or not?
Germany has many motorways without speed limits; a lot of drivers and car makers really love those. I don't think German insurance companies (or German politicians) will stay in business if they make unreasonable (in the eyes of German drivers) demands.
And for the rest of Europe: insurance fees already depend on driver age, driver accident history, and power/speed/reputation of the car. This will be just one more factor to take into account to calculate the fees. I can't imagine that a road-legal car (i.e. with a working switch) will be refused.
"Standard incandescents run about 2.2% efficiency. "
That is the luminous efficiency, which is a rather misleading quantity if taken out of context, since it counts "losses" in the human eye as well. A theoretical lamp that turns 100% of the electrical power into white, visible light would have a luminous efficiency of about 40%.
For Li ion you need to stay below 80% state of charge to extend the battery life. The depth of discharge doesn't matter so much (the 0% level has plenty of safety margin above the true lower limit.)
"I'd be surprised if anything readily available to pirates can encode full-speed 4K with enough effect to make storage feasible."
My smartphone can encode 4K resolution real time at an unspecified frame rate and 1080p (2K) at 60 fps.. The compression rate is lousy (but no big deal for a hard disk or SSD), so you'd have to do a slow re-encode later on.
Error correction is actually done with extra bits stored on the cd (and actually about 5 bits per 16-bit sample, I think) and dithering actually *adds* dynamic range to about 120 dB at frequencies that matter (at the expense of a bit more noise at high frequencies above 10 kHz).
My understanding is that LiPo battery wear mostly occurs at the top of the charge curve: a charge cycle 80%-0%-80% does about the same damage as 80%-20%-80%, but gives you more energy. A reason for avoiding low states of charge (below 20%) is that the internal resistance is higher, so it can't deliver a high current, but that's only relevant for worn-out phone batteries where the phone might shut down unexpectedly.
I found a paper on an ultrasonic fingerprint sensor: https://www.researchgate.net/p... . It's probrably not the exact technology that qualcomm uses (this one doesn't handle 2 mm of display and touch screen on top of the sensor). But it does mention an essential concept: the sensor is an array of transducers; a cluster of nearby transducers sends an ultrasonic pulse (14 MHz carrier, ) with delays such that the wave is focused at some distance from the transducer, somewhere inside the skin (so that it's harder to fake).
Presumably, one could do many pixels in parallel, if there is enough data bandwidth and signal processing capacity to handle entire waveforms for each pixel.
I have a Pocket Geiger that plugs into a phone, originally developed as low-cost radiation monitor for people in the Fukushima region.
I was rather disappointed to see how little radioactivity it could find around where I live.
The device uses a semiconductor sensor that is not very sensitive; you have to let it count for a while at a few clicks per minute. Also, I learned that it is calibrated for ~1 MeV gamma rays from Cs-137 and Sr-60 (the ones that are most bothersome around nuclear incidents). It will register a lot more clicks around an old smoke detector (Am-241) or thorium gas lantern-mantle, but those are likely low-energy gamma rays (10-100 keV) in the decay chain that should be converted to microsieverts with a much lower conversion factor.
I hsve been in Turkey quite a few times and can assure you that toilet paper is commonly used. They don't flush it though because the sewer system can't handle it.
It's much more complicated than that. The silicon substrate of the image sensor has a thermal conductivity that is over 100x higher than that of water and human tissue, which more than compensates the smaller volume of material. But a high-quality camera lens can focus a laser beam much better than the eye lens, at least for visible light. The camera lens aperture (for a DSLR or mirrorless camera) is larger than that of the human eye, so it may collect more laser power, depending on the beam diameter.
My phone has off-screen touch-sensitive buttons. They would trigger all the time if my finger accidentally slid off-screen, so I disabled them. The on-screen soft buttons are smarter and trigger not on slide-ins, only on taps. The occasional extra step to make them visible in a full screen app really doesn't bother me.
Slashdot Mirror
From TFS: "shrinking a transistor measurement to ... 5 nm -- from 7nm."
These node names have long lost their correspondence to actual dimensions on a chip. For 7 nm (easier to find data on than 5 nm) the transistor density is 60-80 transistors per square m, about 120 nm for a square transistors.
Source: https://en.m.wikipedia.org/wik...
"35GW"
That's the correct unit but the wrong number. If they produce 35 GWh worth of battery capacity per year, that's 35 GWh/y or 0.0040 GW on average.
How do motorcyclists in North America prevent hearing damage if they are not allowed to wear earplugs? Wind noise at highway speeds can reach 110+ dB (A) on a bike without wind screen.
https://m.hear-it.org/motorcyc...
(Although the a-holes that modify the tailpipes to make them louder deserve to end up deaf.)
If they used many radio telescopes across the world as a phase array, one should be aware that the imaging properties are very different from optical lenses; it's a bit like taking a big optical telescope mirror and painting most of the surface black except a few small specks. You get a good resolution for objects in front of the telescope, but you'll also image objects at different angles and you can't tell them apart.
V^2 scaling for fuel burn rate (I assume that's what you mean) means that the fuel consumption per distance scales as V^1, though. That helps, but not dramatically.
"losses go as the square of velocity,"
Is it that simple? (And do you mean losses per time or losses per distance covered?) I'd think the efficiency of turbofan engines and airplanes is a great deal more complicated than "drag scales as v-cubed", which you would use for a car. At lower velocities, a plane needs a different wing angle to maintain lift; with lower fuel consumption, there's less fuel mass to carry; each engine has a different thrust/velocity/fuel consumption curve.
The biggest gain comes from those huge high-bypass engines, the ones that didn't fit under the 737MAX wings. They need slightly lower air speeds than the old jet engines.
Patents are country-specific; a single patentable idea can become 150-ish patents for world-wide coverage. This number could represent as few as 160 unique patentable ideas.
Where in Europe is that? The major banks in the Netherlands require 2FA for transactions.
Calling it a money grab is a bit too strong, but I'd be more willing to donate if they made it more clear what it's used for. (I did donate a few times.)
It's not clear whether it's a non-profit organization or a company. I have no idea how many person- hours they put in and how much they get paid.
The donations over 2018 totalled about $140k. Other sources of income are not disclosed. - https://linuxmint.com/donors.p... - Is that a lot or not?
Germany has many motorways without speed limits; a lot of drivers and car makers really love those. I don't think German insurance companies (or German politicians) will stay in business if they make unreasonable (in the eyes of German drivers) demands.
And for the rest of Europe: insurance fees already depend on driver age, driver accident history, and power/speed/reputation of the car. This will be just one more factor to take into account to calculate the fees. I can't imagine that a road-legal car (i.e. with a working switch) will be refused.
Two important bits in TFA are not mentioned in the summary:
1. there will be a switch to disable the speed limiter until the engine is powered off.
2. The car gets a black box that can be accessed after an accident.
> They are charging the cell at a little over 1C. This is really pretty trivial
18 V x 4.5 A is converted to about 20 A at 4 V. For a 4 Ah battery; that is 5 C/h of charging current. I wouldn't call that trivial.
That Gamma page is sorted with the most expensive on top. The existence of fancy bulbs at EUR 100 for a 2-pack won't convince a lot of people. :-)
"Standard incandescents run about 2.2% efficiency. "
That is the luminous efficiency, which is a rather misleading quantity if taken out of context, since it counts "losses" in the human eye as well. A theoretical lamp that turns 100% of the electrical power into white, visible light would have a luminous efficiency of about 40%.
For Li ion you need to stay below 80% state of charge to extend the battery life. The depth of discharge doesn't matter so much (the 0% level has plenty of safety margin above the true lower limit.)
Source: https://accubattery.zendesk.co...
(Disclaimer: The data is for batteries charged to 4.25 V. It's not clear how it translates to newer high-voltage cells at 4.35 V.)
"I'd be surprised if anything readily available to pirates can encode full-speed 4K with enough effect to make storage feasible."
My smartphone can encode 4K resolution real time at an unspecified frame rate and 1080p (2K) at 60 fps.. The compression rate is lousy (but no big deal for a hard disk or SSD), so you'd have to do a slow re-encode later on.
Error correction is actually done with extra bits stored on the cd (and actually about 5 bits per 16-bit sample, I think) and dithering actually *adds* dynamic range to about 120 dB at frequencies that matter (at the expense of a bit more noise at high frequencies above 10 kHz).
https://people.xiph.org/~xiphm...
https://youtu.be/cIQ9IXSUzuM
My understanding is that LiPo battery wear mostly occurs at the top of the charge curve: a charge cycle 80%-0%-80% does about the same damage as 80%-20%-80%, but gives you more energy. A reason for avoiding low states of charge (below 20%) is that the internal resistance is higher, so it can't deliver a high current, but that's only relevant for worn-out phone batteries where the phone might shut down unexpectedly.
Reference: https://accubattery.zendesk.co...
I found a paper on an ultrasonic fingerprint sensor: https://www.researchgate.net/p... . It's probrably not the exact technology that qualcomm uses (this one doesn't handle 2 mm of display and touch screen on top of the sensor). But it does mention an essential concept: the sensor is an array of transducers; a cluster of nearby transducers sends an ultrasonic pulse (14 MHz carrier, ) with delays such that the wave is focused at some distance from the transducer, somewhere inside the skin (so that it's harder to fake).
Presumably, one could do many pixels in parallel, if there is enough data bandwidth and signal processing capacity to handle entire waveforms for each pixel.
Unlikely. An interferometer typically has subwavelength depth resolution, but much coarser lateral resolution.
I have a Pocket Geiger that plugs into a phone, originally developed as low-cost radiation monitor for people in the Fukushima region.
I was rather disappointed to see how little radioactivity it could find around where I live.
The device uses a semiconductor sensor that is not very sensitive; you have to let it count for a while at a few clicks per minute. Also, I learned that it is calibrated for ~1 MeV gamma rays from Cs-137 and Sr-60 (the ones that are most bothersome around nuclear incidents). It will register a lot more clicks around an old smoke detector (Am-241) or thorium gas lantern-mantle, but those are likely low-energy gamma rays (10-100 keV) in the decay chain that should be converted to microsieverts with a much lower conversion factor.
I hsve been in Turkey quite a few times and can assure you that toilet paper is commonly used. They don't flush it though because the sewer system can't handle it.
According to TFA: Musk wants to use 301 steel at about $3 per kg.
It's much more complicated than that. The silicon substrate of the image sensor has a thermal conductivity that is over 100x higher than that of water and human tissue, which more than compensates the smaller volume of material. But a high-quality camera lens can focus a laser beam much better than the eye lens, at least for visible light. The camera lens aperture (for a DSLR or mirrorless camera) is larger than that of the human eye, so it may collect more laser power, depending on the beam diameter.
My phone has off-screen touch-sensitive buttons. They would trigger all the time if my finger accidentally slid off-screen, so I disabled them. The on-screen soft buttons are smarter and trigger not on slide-ins, only on taps. The occasional extra step to make them visible in a full screen app really doesn't bother me.