Looks like that is what happened, also there were reports of a loud bang as it fell which could be the tensioning member giving out. It comes down to where exactly it went wrong. As a side note I'm putting the same note on my oscope lol. Definately has personality while being pretty accurate.
Those would be reasonable things to look at. The first case would be improperly tensioned members and the cracks just a sign of what was happening and not necessarily the main problem. The second case you mention the cracks would be secondary to the compressive strength of the concrete or possibly unrelated if it was a rebar issue as well. Cracks in concrete aren't always a big deal and the explanation that they were checked and fine sounds plausible. Additional evidence is that people heard an extremely loud bang just as it collapsed, it did look like the bar popped out, and if true this was probably the tensioning member suddenly giving out. From the video it just fell apart where the structural members came together on the sides, as if it was rigidly constrained but then suddenly was free to rotate.
Not directly. It depends on the shapeof the crack. If it was orthogonal to the bridge, structural strength would be just fine. It's analogous to setting one brick on another with a weight on it and still supporting the load. Now if it was a clean radius, say by two cracks in a V, so the V chunk pops out below a center tension bar, it is free to bend like a hinge. Now if it was cracked because it was dropped, and the center member damaged, this could be a failure of the tensioning member. But if they looked at it and it looked ok, I doubt the crack was a problem itself.
As a mechanical engineer, I'd just like to point out that you should place emphasis on it is crack or subsurface fracture in the tensioning member and not the concrete. The news media was making waves about some visible cracking in the concrete which would not necessarily be a concern here as the whole idea is concrete is quite strong in compression. A crack that was stable under compression, not allowing movement, would simply be compressed together and still retain structural integrity.
Our goal is to give a theoretical explanation for why the emergent laws of gravity differ from those of general relativity precisely when the inequality (1.4) is obeyed.
from page 6 this cluster obeys 1.4 but is inconsistent with the theory. So in essence this observation, if correct, is evidence against the proposed theory as it provides no mechanism I am aware of that would yield a rotation consistent with standard model like this observation does.
Given that this looks like a small dense globular cluster emerging from a larger cluster, and its extra bright (probably due to gas shock that started up new stars) it could be shaping up to be bullet cluster #2. link to actual non-paywalled source
Hereis a non paywalled source. This is interesting because it is yet another data point that our understanding of gravitational forces on normal baryonic matter (regular stuff) can hold at at least a few kilo parsecs.
While it's true we don't know if dark matter is an effect, or an actual stuff like wimps (weakly interacting massive particles), the evidence of uniform dispersion from gravitational lensing to kinematics while the uniformity still clumps in a gravitational way is starting to be convincing. A great example is the bullet cluster where the friction of the colliding gasses slowed the normal matter but the dark matter was virtually unaffected, the gravitational attraction was too weak and the dark matter stripped from the baryonic matter. But further, computational models consistent with measurement rely on dark matter to have a cooling effect which wouldn't work (or it's not at all clear anyhow) if it wasn't particle like. If I was a betting man, I'd put my money on a weakly interacting particle.
Hold everyone accountable. The NSA deserves no pass. Nor do the criminals who used the exploits. But the NSA created them instead of letting vendors patch, undoubtedly used them criminally, then negligently lost them where they were used against America. The criminal hackers were likely to do the same activities, the NDA just made thier lives easier. I'd put more blame on the NSA.
Its the exact same stretch of road, under the same conditions. Uber has either purposefully faked the video, or is 100% negligent in their choice of camera.
Holy crap I'd like to disagree, but I think you are right. I'm not sure if the driver was paying attention they could have done anything because the assumption would be the car would do the right thing, like it did for the last 200 hours straight. That shaves off valuable seconds of reaction time. Having a driver take over is safety theater, there is a reason more responsible companies don't do it like uber.
True. To get to 80% wind and solar across most of the US without you would need something like a minimum of 12 hours storage, 48+ would really start to shine. To get 100% robustly I'm guessing a full week. As soon as the price drops, and the secondary use market picks up, this will start being feasible.
Exactly. The only real problem to solve before solar and wind can do a 100% replacement is storage. Solar dosent work at night, works half well during heavy overcast or rainy conditions, and can stop if the panels get snowed on (until they are cleared or melt thier way to freedom). Wind power obviously needs wind, too much or little can also be a problem. You can pump water to store electric power, but it requires large volumes of water and expensive equipment. Batteries would be an ideal way, but they are still too expensive. I think Musk has the right idea, if we can use old electric car packs that are near the end of useful life for the needs of a car, the cost per kWh of storage should get quite cheap as electric cars go mainstream. Not only that, but wind solar and on site storage can remove the need for an electrical grid and centralized production, electric power companies are crapping thier grundies over this.
It gets better, hereis what the street really looks like at night. About 1 second before the accident there is a yield to bikes sign due to all the bicycle traffic in the area.
Here is a real video of the same stretch of road using about a 3 dollar camera sensor found in a smartphone. Yes, pre 2000 a a sugar cube or smaller sized daytime video camera would have a crappy grainy picture when used at night. But in 2018 that dosent fly in a 40 dollar phone anymore, much less the main camera for a self driving car. It's to hide the fact Uber should be facing charges of vehicular homicide for incompetence and negligence.
I've used hacked Kinect sensors as far back as when I worked in a distributed robotics lab as an undergrad. This was forever ago when they first came out (far easier nowadays with all the info available). We were psyched that they could be a cheap alternative to the SICK laser scanners that we were using on our larger robots. We also hacked laser mice to measure actual distance (doubly so on designs that the drive system slipped with respect to the ground) and did all kinds of fun stuff. I would have killed for a smaller sensor, integrated into a phone, so that I could use it as the brains for miniature robotic platforms. Doing slam well, even with a 6 foot range on the depth of field sensor, on an inexpensive robot that would fit in my palm would be a dream come true. In 5 years people will start throwing these phones away for almost no money, doubly so when a button gets stuck or the screen gets a crack. That's when the really cool kids will live my dream.
And in case that wasn't enough, now we have this little gem too. I get the distinct impression the easiest way to implement a dystopian future is through the boiled frog approach and the water is pretty nice and toasty about now.
Slashdot Mirror
Looks like that is what happened, also there were reports of a loud bang as it fell which could be the tensioning member giving out. It comes down to where exactly it went wrong. As a side note I'm putting the same note on my oscope lol. Definately has personality while being pretty accurate.
Those would be reasonable things to look at. The first case would be improperly tensioned members and the cracks just a sign of what was happening and not necessarily the main problem. The second case you mention the cracks would be secondary to the compressive strength of the concrete or possibly unrelated if it was a rebar issue as well. Cracks in concrete aren't always a big deal and the explanation that they were checked and fine sounds plausible. Additional evidence is that people heard an extremely loud bang just as it collapsed, it did look like the bar popped out, and if true this was probably the tensioning member suddenly giving out. From the video it just fell apart where the structural members came together on the sides, as if it was rigidly constrained but then suddenly was free to rotate.
Not directly. It depends on the shapeof the crack. If it was orthogonal to the bridge, structural strength would be just fine. It's analogous to setting one brick on another with a weight on it and still supporting the load. Now if it was a clean radius, say by two cracks in a V, so the V chunk pops out below a center tension bar, it is free to bend like a hinge. Now if it was cracked because it was dropped, and the center member damaged, this could be a failure of the tensioning member. But if they looked at it and it looked ok, I doubt the crack was a problem itself.
The cracks were likely inconsequential because the concrete was to be used in compression and not tension.
If you know how this process works, and watch the video of the bridge falling apart like a stack of cards, it is kind of obvious.
As a mechanical engineer, I'd just like to point out that you should place emphasis on it is crack or subsurface fracture in the tensioning member and not the concrete. The news media was making waves about some visible cracking in the concrete which would not necessarily be a concern here as the whole idea is concrete is quite strong in compression. A crack that was stable under compression, not allowing movement, would simply be compressed together and still retain structural integrity.
Our goal is to give a theoretical explanation for why the emergent laws of gravity differ from those of general relativity precisely when the inequality (1.4) is obeyed.
from page 6 this cluster obeys 1.4 but is inconsistent with the theory. So in essence this observation, if correct, is evidence against the proposed theory as it provides no mechanism I am aware of that would yield a rotation consistent with standard model like this observation does.
Given that this looks like a small dense globular cluster emerging from a larger cluster, and its extra bright (probably due to gas shock that started up new stars) it could be shaping up to be bullet cluster #2. link to actual non-paywalled source
Hereis a non paywalled source. This is interesting because it is yet another data point that our understanding of gravitational forces on normal baryonic matter (regular stuff) can hold at at least a few kilo parsecs.
While it's true we don't know if dark matter is an effect, or an actual stuff like wimps (weakly interacting massive particles), the evidence of uniform dispersion from gravitational lensing to kinematics while the uniformity still clumps in a gravitational way is starting to be convincing. A great example is the bullet cluster where the friction of the colliding gasses slowed the normal matter but the dark matter was virtually unaffected, the gravitational attraction was too weak and the dark matter stripped from the baryonic matter. But further, computational models consistent with measurement rely on dark matter to have a cooling effect which wouldn't work (or it's not at all clear anyhow) if it wasn't particle like. If I was a betting man, I'd put my money on a weakly interacting particle.
Hold everyone accountable. The NSA deserves no pass. Nor do the criminals who used the exploits. But the NSA created them instead of letting vendors patch, undoubtedly used them criminally, then negligently lost them where they were used against America. The criminal hackers were likely to do the same activities, the NDA just made thier lives easier. I'd put more blame on the NSA.
Its the exact same stretch of road, under the same conditions. Uber has either purposefully faked the video, or is 100% negligent in their choice of camera.
So whoever released their tools gets a pass?
Maybe the NSA should have shown them more respect than a toddler and his gloves on a school bus.
I asked Alexa if Facebook listens to every word I say without me knowing, she said no.
I tried to delete Facebook, but I'm having trouble hacking in and remote wiping the whole deal. Any ideas?
I think you are right, but if you look on the other side of the road it does look like a place people cross to the bike lane. It's paved.
It does say "yield to bikes".
Holy crap I'd like to disagree, but I think you are right. I'm not sure if the driver was paying attention they could have done anything because the assumption would be the car would do the right thing, like it did for the last 200 hours straight. That shaves off valuable seconds of reaction time. Having a driver take over is safety theater, there is a reason more responsible companies don't do it like uber.
True. To get to 80% wind and solar across most of the US without you would need something like a minimum of 12 hours storage, 48+ would really start to shine. To get 100% robustly I'm guessing a full week. As soon as the price drops, and the secondary use market picks up, this will start being feasible.
Exactly. The only real problem to solve before solar and wind can do a 100% replacement is storage. Solar dosent work at night, works half well during heavy overcast or rainy conditions, and can stop if the panels get snowed on (until they are cleared or melt thier way to freedom). Wind power obviously needs wind, too much or little can also be a problem. You can pump water to store electric power, but it requires large volumes of water and expensive equipment. Batteries would be an ideal way, but they are still too expensive. I think Musk has the right idea, if we can use old electric car packs that are near the end of useful life for the needs of a car, the cost per kWh of storage should get quite cheap as electric cars go mainstream. Not only that, but wind solar and on site storage can remove the need for an electrical grid and centralized production, electric power companies are crapping thier grundies over this.
It gets better, hereis what the street really looks like at night. About 1 second before the accident there is a yield to bikes sign due to all the bicycle traffic in the area.
Here is a real video of the same stretch of road using about a 3 dollar camera sensor found in a smartphone. Yes, pre 2000 a a sugar cube or smaller sized daytime video camera would have a crappy grainy picture when used at night. But in 2018 that dosent fly in a 40 dollar phone anymore, much less the main camera for a self driving car. It's to hide the fact Uber should be facing charges of vehicular homicide for incompetence and negligence.
It can't be thier core business, Elon said the core of the bricks would be hollow.
I've used hacked Kinect sensors as far back as when I worked in a distributed robotics lab as an undergrad. This was forever ago when they first came out (far easier nowadays with all the info available). We were psyched that they could be a cheap alternative to the SICK laser scanners that we were using on our larger robots. We also hacked laser mice to measure actual distance (doubly so on designs that the drive system slipped with respect to the ground) and did all kinds of fun stuff. I would have killed for a smaller sensor, integrated into a phone, so that I could use it as the brains for miniature robotic platforms. Doing slam well, even with a 6 foot range on the depth of field sensor, on an inexpensive robot that would fit in my palm would be a dream come true. In 5 years people will start throwing these phones away for almost no money, doubly so when a button gets stuck or the screen gets a crack. That's when the really cool kids will live my dream.
Lol, it's the first google hit for alphanumeric passcode ios11
And in case that wasn't enough, now we have this little gem too. I get the distinct impression the easiest way to implement a dystopian future is through the boiled frog approach and the water is pretty nice and toasty about now.