Assuming it is a Li-ion battery- 3.6V nominal and 4Ah there was 14 Wh stored in the battery. The charger used about 80W over the time 17/60th of an hour- about 23 Wh provided- so 9Wh ends up as heat, using a conversion- that means about 32000 J.
To put this in perspective- 12oz of water is about 340g, and the specific heat of water is 4200 Joules per kilogram per degree Celsius (J/kgC) so... 32000 J/(.340 kg * 4200 J/kgC) = 22C (72F) - not an insignificant amount of heat. Not crazy though.
We are not to full self driving, but Automatic Emergency Braking falls under the category of useful "the moment something hairy happens," you may not even realize it is taking over- you get a chime or notification, but you're way too busy processing everything else. It is really about the difficulty of proving the absence of something- in this case, the absence of a collision.
IIHS data show rear-end collisions are cut by 50 percent on vehicles with AEB and FCW.
ABS was a technology many thought was lacking- and initially, it probably was. But today- I'm pretty sure the most experienced driver can not beat the most recent ABS, considering the ability to monitor/control the speed of each wheel separately.
OK, Gotcha. As I understand it, more than anything, what the paper shows is a proof-of-concept that does away with traditional antennas (using electromagnetic waves to induce electron flow in a conductor), replacing it with monitoring something that is changing due to EM waves effect upon quantum states- making the wavelength of the electromagnetic wave irrelevant. Of course, this is my interpretation, but if it proves out- this is a very different way of doing things than we have been doing since Maxwell, and could lead to some very cool new things.
AM and FM are modulations, used in broadcast band communications. This technique (as described by the paper) can be used to play back signals that were modulated onto a carrier- changing the carrier's Amplitude and Frequency.
What gets me most excited about this is that the receiving element is tiny- if they can also be made dense- and it looks like there are elements that can be shared among multiple receivers to increase density. A dense set of antennas allows for very directional beamforming, and IIRC, this is a sufficient way to have an extremely accurate directional receiver. The Coherence of the laser should even help with that. Their photodiode as a demodulator is primitive, but a start.
I think the ranking is BS- but they do expose the methodology if you click into it. AFAICT the ranking is about what languages people are *interested* in. Not necessarily being used by experienced programmers (EE or CS)
What I saw was open floor space and some tables- small for a "computer factory" tiny if it is also to include warehouse space. A factory requires a massive amount of infrastructure and capital investment. If they are also taking more development on, the amount of test space is significant as well. Commercial rent is not cheap in Denver, nor is the cost of living- I live in Austin, TX- relatively expensive for Texas, and Denver is about 10% higher than here. This is the type of move they need to grow, I'm sure. I hope it works.
I'd say a bit longer than that- maybe a week, but no longer than a month- say someone has their car stolen from their home and don't discover it until they come back from a vacation- it would be nice to be able to track it down.
What I really want to know is what they are truly doing with the data and the contribution to solving crime and public safety.
Most uncertainty is locked up in ionospheric conditions which affect how long signal takes to reach receiver. If you have multiple signals on multiple frequencies
RTK does not make use of that potential information. Ionospheric propagation effects depend on frequency but are not fixed.
Since the same p(y) code is transmitted on L1 and L2 from each satellite, can't that be used to model ionospheric effects?
Minor correction: "A better method is to produce an accurate, but wrong signal." should be "A better method is to produce an apparently accurate, but wrong signal."
No matter what radio based technology you have, RF can be jammed- just pump enough energy into the air- and the closer you are to the target, the easier it is. The downside to jamming of that method is that it is really obvious. A better method is to produce an accurate, but wrong signal. If you want to create a trustworthy RF navigation system the signal must be authenticated. Most forget that the GPS system in our cell-phones is only the first step of the actual military system- it gives you a good estimate so you can switch to the more precise encrypted signal (rotating keys that are classified and have a pseudo-noise sequence that never repeats in the valid lifetime of the key, which is on the order of months).
Without a method to prevent spoofing via a verifiable chain of trust, the system dead before it begins.
No. USB C was the first USB cable to have the option of an embedded chip, The embedded part communicates on the "CC" line- configuration channel (which only is on the USB C cable). Some (but not all) USB-C cable configurations *require* the chip- such as a cable that is rated to deliver 100W via USB-PD.
Claiming to and actually making a cable that can still meet the spec after the specified number of insertions and removals is 2 different things. If someone is claiming this and doesn't have a traceable USB logo (back to the USB-IF) I wouldn't count on it.
If we want higher speeds and capability, this is the way it must go. Even a badly manufactured USB 2.0 cable could fry (or at least trigger the overcurrent protection) if its V+ and GND were crossed.
There is a minimum standard for the Type C cable- once you get into the more complex cables there is active circuitry inside the cable that identifies the capabilities of the cable. Cables that are compliant with the standard should prevent dangerous situations (such as trying to put 100W down a cable that is not rated for it). At the super high data rates we're talking about and more than a few feet- we're stuck with active circuitry for redrivers. We're going to have to get away from the idea that it is just a wire- it's part of the system and we have to take it into account.
The difference is that the data on each line is sent serially, with embedded clocking and controlled skew between lanes- meaning that the data on each lane is somewhat independent. In general a parallel bus includes separate clocking. In a serial bus like this, the data is encoded in certain ways to allow the clock to be a part of the data- the most basic encoding is what is used in 10Mb Ethernet- Manchester, where every bit has it's own clock, and it goes up from there.
As I read it (though I'm not expert at reading RFCs), the RFC explicitly states that the tokens can be used but re-assembled without them, so Google is EXACTLY following RFC822:
6.2.4. DOMAIN-DEPENDENT LOCAL STRING [...]
This specification treats periods (".") as lexical separators.
Hence, their presence in local-parts which are not quoted-
strings, is detected. However, such occurrences carry NO
semantics. That is, if a local-part has periods within it, an
address parser will divide the local-part into several tokens,
but the sequence of tokens will be treated as one uninter-
preted unit. The sequence will be re-assembled, when the
address is passed outside of the system such as to a mail pro-
tocol service.
I suspect, that if the ATC system becomes GPS based, the government will have a waiver to the p(y) code key availability for commercial airliners. The KYK-13 was designed for secure storage/transfer of the keys, and the p(y) receivers are designed to not give up their keys. The precise GPS code was designed to be difficult to spoof, and jammers have this characteristic of being quite visible to those looking for them.
The video test shows the weight hitting dead center, making a clear mark- probably a crack in the tile. In addition, the tile was not held down- it was allowed to bounce up, releasing some of the energy- it wasn't a test representative of reality.. Affixed to the roof, the energy of the dropping object has to go somewhere. Furthermore, in a hailstorm- the hail will be hitting *everywhere* on the tile, not just in the center, but on the edges. I've been through a hailstorm with hail that was easily golf-ball sized. My roof (asphalt shngle) was a total loss, plus my cars all had major damage, including having to replace windshields.
All that said, I like the idea, and if Tesla is willing to warranty it against hail, I'll sign up./p?
Slashdot Mirror
Assuming it is a Li-ion battery- 3.6V nominal and 4Ah there was 14 Wh stored in the battery. The charger used about 80W over the time 17/60th of an hour- about 23 Wh provided- so 9Wh ends up as heat, using a conversion- that means about 32000 J.
To put this in perspective- 12oz of water is about 340g, and the specific heat of water is 4200 Joules per kilogram per degree Celsius (J/kgC) so... 32000 J /(.340 kg * 4200 J/kgC) = 22C (72F) - not an insignificant amount of heat. Not crazy though.
We are not to full self driving, but Automatic Emergency Braking falls under the category of useful "the moment something hairy happens," you may not even realize it is taking over- you get a chime or notification, but you're way too busy processing everything else. It is really about the difficulty of proving the absence of something- in this case, the absence of a collision.
From Consumer Reports:
IIHS data show rear-end collisions are cut by 50 percent on vehicles with AEB and FCW.
ABS was a technology many thought was lacking- and initially, it probably was. But today- I'm pretty sure the most experienced driver can not beat the most recent ABS, considering the ability to monitor/control the speed of each wheel separately.
Well CARP- I totally missed this- Red Shirts *was* a live action series on FX for 2 seasons!
This sounds a lot like John Scalzi's "Redshirts" - a great novel with characters transitioning in and out of "The Narrative"- Highly recommended.
OK, Gotcha. As I understand it, more than anything, what the paper shows is a proof-of-concept that does away with traditional antennas (using electromagnetic waves to induce electron flow in a conductor), replacing it with monitoring something that is changing due to EM waves effect upon quantum states- making the wavelength of the electromagnetic wave irrelevant. Of course, this is my interpretation, but if it proves out- this is a very different way of doing things than we have been doing since Maxwell, and could lead to some very cool new things.
AM and FM are modulations, used in broadcast band communications. This technique (as described by the paper) can be used to play back signals that were modulated onto a carrier- changing the carrier's Amplitude and Frequency.
What gets me most excited about this is that the receiving element is tiny- if they can also be made dense- and it looks like there are elements that can be shared among multiple receivers to increase density. A dense set of antennas allows for very directional beamforming, and IIRC, this is a sufficient way to have an extremely accurate directional receiver. The Coherence of the laser should even help with that. Their photodiode as a demodulator is primitive, but a start.
I think the ranking is BS- but they do expose the methodology if you click into it. AFAICT the ranking is about what languages people are *interested* in. Not necessarily being used by experienced programmers (EE or CS)
What I saw was open floor space and some tables- small for a "computer factory" tiny if it is also to include warehouse space. A factory requires a massive amount of infrastructure and capital investment. If they are also taking more development on, the amount of test space is significant as well. Commercial rent is not cheap in Denver, nor is the cost of living- I live in Austin, TX- relatively expensive for Texas, and Denver is about 10% higher than here. This is the type of move they need to grow, I'm sure. I hope it works.
This is well known and already compensated for in GPS (it must be, or GPS would not work).
I'd say a bit longer than that- maybe a week, but no longer than a month- say someone has their car stolen from their home and don't discover it until they come back from a vacation- it would be nice to be able to track it down.
What I really want to know is what they are truly doing with the data and the contribution to solving crime and public safety.
Most uncertainty is locked up in ionospheric conditions which affect how long signal takes to reach receiver. If you have multiple signals on multiple frequencies
RTK does not make use of that potential information. Ionospheric propagation effects depend on frequency but are not fixed.
Since the same p(y) code is transmitted on L1 and L2 from each satellite, can't that be used to model ionospheric effects?
Minor correction: "A better method is to produce an accurate, but wrong signal." should be "A better method is to produce an apparently accurate, but wrong signal."
No matter what radio based technology you have, RF can be jammed- just pump enough energy into the air- and the closer you are to the target, the easier it is. The downside to jamming of that method is that it is really obvious. A better method is to produce an accurate, but wrong signal. If you want to create a trustworthy RF navigation system the signal must be authenticated. Most forget that the GPS system in our cell-phones is only the first step of the actual military system- it gives you a good estimate so you can switch to the more precise encrypted signal (rotating keys that are classified and have a pseudo-noise sequence that never repeats in the valid lifetime of the key, which is on the order of months).
Without a method to prevent spoofing via a verifiable chain of trust, the system dead before it begins.
No. USB C was the first USB cable to have the option of an embedded chip, The embedded part communicates on the "CC" line- configuration channel (which only is on the USB C cable). Some (but not all) USB-C cable configurations *require* the chip- such as a cable that is rated to deliver 100W via USB-PD.
Claiming to and actually making a cable that can still meet the spec after the specified number of insertions and removals is 2 different things. If someone is claiming this and doesn't have a traceable USB logo (back to the USB-IF) I wouldn't count on it.
If we want higher speeds and capability, this is the way it must go. Even a badly manufactured USB 2.0 cable could fry (or at least trigger the overcurrent protection) if its V+ and GND were crossed.
There is a minimum standard for the Type C cable- once you get into the more complex cables there is active circuitry inside the cable that identifies the capabilities of the cable. Cables that are compliant with the standard should prevent dangerous situations (such as trying to put 100W down a cable that is not rated for it). At the super high data rates we're talking about and more than a few feet- we're stuck with active circuitry for redrivers. We're going to have to get away from the idea that it is just a wire- it's part of the system and we have to take it into account.
The difference is that the data on each line is sent serially, with embedded clocking and controlled skew between lanes- meaning that the data on each lane is somewhat independent. In general a parallel bus includes separate clocking. In a serial bus like this, the data is encoded in certain ways to allow the clock to be a part of the data- the most basic encoding is what is used in 10Mb Ethernet- Manchester, where every bit has it's own clock, and it goes up from there.
As I read it (though I'm not expert at reading RFCs), the RFC explicitly states that the tokens can be used but re-assembled without them, so Google is EXACTLY following RFC822:
6.2.4. DOMAIN-DEPENDENT LOCAL STRING
[...]
This specification treats periods (".") as lexical separators.
Hence, their presence in local-parts which are not quoted-
strings, is detected. However, such occurrences carry NO
semantics. That is, if a local-part has periods within it, an
address parser will divide the local-part into several tokens,
but the sequence of tokens will be treated as one uninter-
preted unit. The sequence will be re-assembled, when the
address is passed outside of the system such as to a mail pro-
tocol service.
I suspect, that if the ATC system becomes GPS based, the government will have a waiver to the p(y) code key availability for commercial airliners. The KYK-13 was designed for secure storage/transfer of the keys, and the p(y) receivers are designed to not give up their keys. The precise GPS code was designed to be difficult to spoof, and jammers have this characteristic of being quite visible to those looking for them.
Except if someone you emailed happened to share their contact list... they mine that shit for all of our peril.
So... the AI will have all the ethics of linkedin... the freedom to spam every person you've ever contacted, ever?
Fake news is stochastic terrorism- not for a political goal, but for profit.
The video test shows the weight hitting dead center, making a clear mark- probably a crack in the tile. In addition, the tile was not held down- it was allowed to bounce up, releasing some of the energy- it wasn't a test representative of reality.. Affixed to the roof, the energy of the dropping object has to go somewhere. Furthermore, in a hailstorm- the hail will be hitting *everywhere* on the tile, not just in the center, but on the edges. I've been through a hailstorm with hail that was easily golf-ball sized. My roof (asphalt shngle) was a total loss, plus my cars all had major damage, including having to replace windshields.
All that said, I like the idea, and if Tesla is willing to warranty it against hail, I'll sign up./p?