petschge

42 ms·

451.
by petschge 7y ago
This site works ok to find content that is intersting to a large community. The problem in science is "how do you find content for the 5 people working on problem X". For every X.
452.
by petschge 7y ago
Reviewing every paper by just one to three qualified people is already hard and putting a lot of strain on the system. Trying to solve that by "just have everybody read everything and endorse what they like" is going to break it.
453.
by petschge 7y ago
(I agree with the parent poster, but this seems like the right place to add the following.) One thing that people who claim "the scarcity is gone, let's just publish everything" do miss is that there still is a scarcity: The
454.
by petschge 7y ago
This is still true in astronomy. Data between radio telescopes for VLBI or the EHT is shipped in disk packs. I am not sure how Ice cube gets their data back from antartika, but I don't think it is over the thin and expensive satellite
455.
by petschge 7y ago
Flying the flag is not what matters. It is the registration of the ship in a country that matters. The flag is just the announcement where you are registered. And the US will probably not register a refugee boat and of the them the protecti
456.
by petschge 7y ago
The polar station in Antartica is also quite inaccessible during winter. Winter-overs are proud of the fact that they are more remote than the ISS. There you can get in a Soyuz and be back in 90 minutes. In Antartica it might be a month be
457.
by petschge 7y ago
At some point he was using 2/3 of the creek.
458.
by petschge 7y ago
Being able to iterate rapidly might be helpful to get tech of the ground into space once we have it. But right now even Earth-bound optical interferometry is in its infancy compared to optical astronomy and radio interferometry. It is an in
459.
by petschge 7y ago
A replacement might actually easier to build. The detector is no small feat, but the major problems with JWST come from the foldable heat shield and the segmented mirror. Both of which are due to size constraints during launch. Basically it
460.
by petschge 7y ago
Since you are looking at a warm planet you will never get your camera down to 7 K nor do you need to as all sources are close by and bright compared to the astronomical targets for JWST. So the shielding issue is somewhat different. Having
461.
by petschge 7y ago
That was the LISA Pathfinder mission ( https://en.wikipedia.org/wiki/LISA_Pathfinder ), the preparatory step for a gravitational wave detector in space. And yes something like that could work eventually. Right now we are
462.
by petschge 7y ago
This requires keeping the baseline constant to a fraction of the wave length. In other words you would have to position the satellites with a accuracy of 100 nm relative to each other. In other words: No we can not (, yet. For a decade at l
463.
by petschge 7y ago
The science done by a bunch of smaller IR telescope is different from what you can do with JWST. (Basically you are reducing resolution but get better time coverage of transients.)
464.
by petschge 7y ago
Factually there was a hydrogen explosion in Fukushima due to things doing wrong in the nuclear part. And it produced fall out. That is was not a prompt critical nuclear explosion is semantics. You just want to push nuclear instead of being
465.
by petschge 7y ago
Claiming that the fallout is in no part due to exploding nuclear plants is disingenuous.
466.
by petschge 7y ago
Also there is a huge difference between workers installing solar panels dying on the job from falling of roofs and citizens getting killed by exploding nuclear plants. The former is a risk they were very aware of, had some control over and
467.
by petschge 7y ago
Part of the cost of Hubble was that the teams working on the keyhole satellites was not allowed to tell the Hubble designers about "lessons learned" and the Hubble team had to find them out the hard way.
468.
by petschge 7y ago
Regarding the 10 missions before Apollo 11: It's a little more complicated. Apollo 1 is the name that was given to honor the astronauts who died in the pad accident. Apollo 2 and 3 didn't exists. But a whole bunch of other tests d
469.
by petschge 7y ago
I don't. Which is why I called a non-efficient solution. A theoretical solution would be to require ignition interlocks on all new vehicles. Not that I am advocating for that. A more realistic solution should focus more on officers obs
470.
by petschge 7y ago
The deterrence effect is a function of both the severity of the punishment and its certainty. And while the punishment for driving drunk is already substantial (maybe even too high), the risk of getting caught is not that large. An effectiv
471.
by petschge 7y ago
The alt text on https://xkcd.com/893/ fits really well here: “The universe is probably littered with the one-planet graves of cultures which made the sensible economic decision that there's no good reason to go in
472.
by petschge 7y ago
A lot of American can neither afford the good (usually imported) stuff, nor have never learned to appreciate it either.
473.
by petschge 7y ago
What will stop rural Alabama from devolving into a third word country? Or do you still expect the successful urban blocks to pay for the backwaters blocks, but now without any input into their political structure?
474.
by petschge 7y ago
I always assumed all 50 states were that way. Based on your comment I found that Nebraska is the exception. https://en.wikipedia.org/wiki/Nebraska_Legislature
475.
by petschge 7y ago
While the majority of countries in the European Union are not federation of states, there is several that have exactly that structure: Austria, Belgium, Germany, Denmark, Finland, France and the Netherlands. Austria, Germany, Finland and Fr
476.
by petschge 7y ago
Totally good idea to do that. I just want other readers to be aware for what applications that is useful and for what applications other techniques are more appropriate.
477.
by petschge 7y ago
Don't get me wrong: Doing all the approximations to get a fast, visually appealing animation is perfect for what this demo aims to do. Fluid simulations for science or engineering (think airflow around the next Boeing design or simulat
478.
by petschge 7y ago
That is just for your neck. So a tiny imaging volume on a cheaper machine. Using that as a price point for full body imageing is disingenuous.
479.
by petschge 7y ago
Also it uses backward differencing, it makes it stable at long timesteps. That is great to run fast for visualization, but it is horribly inaccurate (or possibly even plain wrong) if your system has large gradients in flow speed.
480.
by petschge 7y ago
These are old MRIs using low fields and limited slew rates. They will give you poor resolution, limited dynamic range and long scan durations (Which makes is even harder to avoid artefacts from patient motion). Check the price tags on new 3

More ›