They were very worried about dust and ice fragments between the rings and Saturn itself before they went inside the rings*, which is why they used the Cassini radio antenna as a shield during the first two ring plane passages. Now that they have found that there is not much dust there, they won't have to do that**, which will free the spacecraft to take better pictures and collect better data.
As for the rest, Cassini entered orbit around Saturn on July 1, 2004. If it hasn't been struck so far, it will probably be OK for the rest of the mission.
* There was talk about doing this with Pioneer 11 in 1979, but in the end it was viewed as too dangerous. ** There will be 4 passes near the D ring for which the antenna will be used as a shield again.
Cassini did not find any material beneath the rings of Saturn - that is, between the lowest ring, the D ring, and the atmosphere of Saturn. I don't know why headline writers have been getting this so consistently wrong.
Airbnb Fires Back, Accuses Hotel Industry Of Punishing the Middle-Class.
A Silicon Valley firm funded by Sequoia Capital accuses a brick and mortar industry of punishing the middle class. Let's hope they don't try and expand into stand up comedy.
The one I looked had gave the airline the right to deny boarding. Once you have taken your seat, you have boarded. Being removed (in plain English, if not at law) is not being denied boarding.
The return flight may be different, but then I have a wife and kids waiting for me to come home, so the reward for volunteering my seat needs to be a lot higher than it used to be.
Really?
You're in that much of a hurry to see wife and kids? I mean, you have to live with and see them every day.....seems like any little breaks would be welcome.
Don't be an idiot. Any parent might have any number of obligations that would make it high priority to get back home. The spouse might have a trip of their own to make, there might be a family trip planned, there might be tickets for shows, concerts, plays, etc., made as a family, there might be school events or athletic events that the parent had promised to be present at, etc., etc. When you are a parent, your time is not entirely your own, and so you cannot give it away as freely as when you are unattached.
One thing that the Russians (and, for that matter, the Americans) understand well is protecting people who turn to their side. If the Russians send Snowden back, it will be a long time before they get another actual defector* to come out of the cold.
My biggest beef is with mobile apps and web forms that do not have a confirmation step. It can be very hard to hit the right spot to toggle the right key on a touch screen, and yet many touch screen forms have the "send" button in the middle of other keys (say, next the the "delete" key). Press the wrong spot on the screen, and, poof, everything goes off, regardless of whether it was what you wanted.
The asteroid finding satellite NEOCam was one of the candidates that didn't get selected, but it has strong institutional support at NASA. Jim Green announced that NEOCam would get one year of additional "Phase A" (i.e., life support) funding, presumably as they try and find a way to fund it.
It's a perpetual motion machine. If you have an engine that produces one newton per 10W of input power, then move it 20 meters a second, you can extract 20W from this. At 200m/s, 200W. Leaving 10 (or 190W) of free energy output after you subtract the first.
Agreed. Let's make this a little more rigorous.
Suppose that the device has a mass of X kg and produces A Newtons per Watt of power, with a power of 1 Watt. Turn it on. It is consuming 1 Joule / sec and producing A Newtons, so the device is (in free space) accelerated at A/X m/sec^2 and (after N seconds) is moving at NA/X m/sec, giving it a kinetic energy (1/2 mv^2) of (X/2) * (NA/X)**2 = N^2 A^2 / 2X Joules for an expenditure of N Joules.
When N^2 A^2 / 2X is >= N you break even (ignoring losses), i.e., when N >= 2 X / A^2. If X is 5 kg and A is ~ 5 x 10^-6 N/W (typical numbers claimed), then N needs to be ~ 4 x 10^11 seconds (12,675 years) and the device velocity will be 400 km/sec. Clearly, energy is being created and (at this relatively low velocity, 0.0013c) special relativity will not change this situation.
Whether this actually works and, if it did, whether it would be a practical means of creating energy are, of course, rather different questions.
It seems that every test of EM drives by credible scientific organizations so far has been successful. Is there some theory now to explain how and why they work?
IMHO, no.
There are plenty of theories, but not one of them would stand up to five minutes of review by a proper theorist. When JASON reviewed Sonny White's work, they were (to be euphemistic) not kind about the theories presented.
Note, by the way, that testing in orbit is not the same as confirmation in orbit, which if you read carefully they are not claiming.
If you want to read about this closer to the source in Chinese, here you go.
The company that overtakes Mac as the main laptop of serious computer users...
Actually, the market is NOT serious computer users.
Those stick with the PC models.
Mac users were/are mostly portable form factor.
I was in the IT business for 30 years and the only business I ever saw that had a Mac system, with desktops, servers and printers was the one I donated to Goodwill in favour of Windows shit.
The users at that firm were were appreciative.
Macs are for niche users -- mostly students and artists.
Sounds like a blast from 1990. Let's just say you obviously don't hang out at the same businesses that I do.
Uber is at present running all of their autonomous vehicle tests with a driver in place. Now, which is easier to believe, that a professional driver in an instrumented test would run a red light, or that Uber would lie about which system was in control of the car at the time of the incident?
But Uber is right in this case, so they're not breaking any laws.
The State of California disagrees. Note this little detail: over 20 companies have gotten permits from the State of California to test (drive) autonomous cars on public streets. That means that Uber is not acting in a regulative vacuum, it is just choosing to ignore the regulations that do exist.
So those road signs and the marks on the road and the traffic lights... those have no legal standing? They weren't put up by the government? They're just decorations? Driver's licenses are optional and there's no law against driving without one as long as you have insurance? You can drive drunk?
Unless you'd like to succeed in physics, chemistry, biology, mathematics, statistics, economics, computer science (not programming), electrical or chemical or mechanical or civil engineering, law, medicine, architecture, etc.
Gosh, I wonder how humanity ever survived learning and training these concepts for hundreds of years without spending $100,000+ on it.
For most of human history, becoming a scientist required that either you be wealthy, or that you find a wealthy patron. For most of human history, there were not very many scientists, and scientific progress was very slow. If we go back to the first condition, we can expect to obtain the second condition as well.
Slashdot Mirror
Does that mean that they no longer need to use the main antenna as a shield when it's going through the gap?
That is exactly what this means, and that will mean better pictures and data from the ring plane passages.
They were very worried about dust and ice fragments between the rings and Saturn itself before they went inside the rings*, which is why they used the Cassini radio antenna as a shield during the first two ring plane passages. Now that they have found that there is not much dust there, they won't have to do that**, which will free the spacecraft to take better pictures and collect better data.
As for the rest, Cassini entered orbit around Saturn on July 1, 2004. If it hasn't been struck so far, it will probably be OK for the rest of the mission.
* There was talk about doing this with Pioneer 11 in 1979, but in the end it was viewed as too dangerous.
** There will be 4 passes near the D ring for which the antenna will be used as a shield again.
Cassini did not find any material beneath the rings of Saturn - that is, between the lowest ring, the D ring, and the atmosphere of Saturn. I don't know why headline writers have been getting this so consistently wrong.
A Silicon Valley firm funded by Sequoia Capital accuses a brick and mortar industry of punishing the middle class. Let's hope they don't try and expand into stand up comedy.
The one I looked had gave the airline the right to deny boarding. Once you have taken your seat, you have boarded. Being removed (in plain English, if not at law) is not being denied boarding.
IANAL, and this is certainly not legal advice.
Really?
You're in that much of a hurry to see wife and kids? I mean, you have to live with and see them every day.....seems like any little breaks would be welcome.
Don't be an idiot. Any parent might have any number of obligations that would make it high priority to get back home. The spouse might have a trip of their own to make, there might be a family trip planned, there might be tickets for shows, concerts, plays, etc., made as a family, there might be school events or athletic events that the parent had promised to be present at, etc., etc. When you are a parent, your time is not entirely your own, and so you cannot give it away as freely as when you are unattached.
I think that
"The prom queen is dressed unusually."
"Why? What are they wearing?" seems like perfectly good English in this case.
In India people will riot over rumors that meat is involved in some common product.
What if you could eat pork without involving a pig? Would it be kosher? If so, that sounds like a market right there.
This doesn't pass the smell test.
One thing that the Russians (and, for that matter, the Americans) understand well is protecting people who turn to their side. If the Russians send Snowden back, it will be a long time before they get another actual defector* to come out of the cold.
* Snowden is not a defector.
My biggest beef is with mobile apps and web forms that do not have a confirmation step. It can be very hard to hit the right spot to toggle the right key on a touch screen, and yet many touch screen forms have the "send" button in the middle of other keys (say, next the the "delete" key). Press the wrong spot on the screen, and, poof, everything goes off, regardless of whether it was what you wanted.
The Perdix drones are based on this MIT student project, which was then turned over to Lincoln Labs for further development.
That's easy, just don't connect them to a network. Works every time.
I will waive any reward. They can donate it to the IETF.
The asteroid finding satellite NEOCam was one of the candidates that didn't get selected, but it has strong institutional support at NASA. Jim Green announced that NEOCam would get one year of additional "Phase A" (i.e., life support) funding, presumably as they try and find a way to fund it.
It doesn't, it just changes the numbers at which breakeven occurs to ones not easy to achieve on earth.
Unless you get to 1N/300000000W (in which case it is a well understood photon drive)
Yes, the claimed EM drive thrusts are much larger than a photon rocket would produce for the consumed power.
It's a perpetual motion machine.
If you have an engine that produces one newton per 10W of input power, then move it 20 meters a second, you can extract 20W from this.
At 200m/s, 200W. Leaving 10 (or 190W) of free energy output after you subtract the first.
Agreed. Let's make this a little more rigorous.
Suppose that the device has a mass of X kg and produces A Newtons per Watt of power, with a power of 1 Watt. Turn it on. It is consuming 1 Joule / sec and producing A Newtons, so the device is (in free space) accelerated at A/X m/sec^2 and (after N seconds) is moving at NA/X m/sec, giving it a kinetic energy (1/2 mv^2) of (X/2) * (NA/X)**2 = N^2 A^2 / 2X Joules for an expenditure of N Joules.
When N^2 A^2 / 2X is >= N you break even (ignoring losses), i.e., when N >= 2 X / A^2. If X is 5 kg and A is ~ 5 x 10^-6 N/W (typical numbers claimed), then N needs to be ~ 4 x 10^11 seconds (12,675 years) and the device velocity will be 400 km/sec. Clearly, energy is being created and (at this relatively low velocity, 0.0013c) special relativity will not change this situation.
Whether this actually works and, if it did, whether it would be a practical means of creating energy are, of course, rather different questions.
It seems that every test of EM drives by credible scientific organizations so far has been successful. Is there some theory now to explain how and why they work?
IMHO, no.
There are plenty of theories, but not one of them would stand up to five minutes of review by a proper theorist. When JASON reviewed Sonny White's work, they were (to be euphemistic) not kind about the theories presented.
Note, by the way, that testing in orbit is not the same as confirmation in orbit, which if you read carefully they are not claiming.
If you want to read about this closer to the source in Chinese, here you go.
The company that overtakes Mac as the main laptop of serious computer users ...
Actually, the market is NOT serious computer users.
Those stick with the PC models.
Mac users were/are mostly portable form factor.
I was in the IT business for 30 years and the only business I ever saw that had a Mac system, with desktops, servers and printers was the one I donated to Goodwill in favour of Windows shit.
The users at that firm were were appreciative.
Macs are for niche users -- mostly students and artists.
Sounds like a blast from 1990. Let's just say you obviously don't hang out at the same businesses that I do.
At Apple, prosumer customers are getting far less attention.
And don't think they haven't noticed it.
Sure.
Uber is at present running all of their autonomous vehicle tests with a driver in place. Now, which is easier to believe, that a professional driver in an instrumented test would run a red light, or that Uber would lie about which system was in control of the car at the time of the incident?
But Uber is right in this case, so they're not breaking any laws.
The State of California disagrees. Note this little detail: over 20 companies have gotten permits from the State of California to test (drive) autonomous cars on public streets. That means that Uber is not acting in a regulative vacuum, it is just choosing to ignore the regulations that do exist.
So those road signs and the marks on the road and the traffic lights... those have no legal standing? They weren't put up by the government? They're just decorations? Driver's licenses are optional and there's no law against driving without one as long as you have insurance? You can drive drunk?
Apparently so, if you you have $ 8 billion or so in the bank.
It's the same old Silicon Valley crap. Laws? What laws? Who needs laws when you have other people's money?
Unless you'd like to succeed in physics, chemistry, biology, mathematics, statistics, economics, computer science (not programming), electrical or chemical or mechanical or civil engineering, law, medicine, architecture, etc.
Gosh, I wonder how humanity ever survived learning and training these concepts for hundreds of years without spending $100,000+ on it.
For most of human history, becoming a scientist required that either you be wealthy, or that you find a wealthy patron. For most of human history, there were not very many scientists, and scientific progress was very slow. If we go back to the first condition, we can expect to obtain the second condition as well.
She lost the election. Accept that as a fact and get on with your life.
Did she? DJT is not President yet. Normally, that would seem like a technicality, but this year...