bernulli

10 ms·

61.
by bernulli 5y ago
How I hate that article. Poor John D. Anderson will forever be associated with this ridiculous claim that no one knows why aircraft fly. Also note, that he does not say that at all: “What Anderson said, however, is that there is actually n
62.
by bernulli 5y ago
Yep, this is it. Ever wondered why syllabi and problem statements are so long, convoluted, and oddly specific? It all boils down to "Fool me once, shame on me. Fool me twice, it's going in the syllabus." [0] Edit: I did not c
63.
by bernulli 5y ago
You can only have a net outflow of water if the air is not saturated with water, which is a function of the air temperature. If it is saturated, a dynamic equilibrium will establish, where water molecules from the air jump back into the sur
64.
by bernulli 5y ago
> why education at all? It seems I addressed that in my post? > Would you apply your same approach/attitude to elementary school education? At what point is it that we shift the burden to learn to the student? I'd say the i
65.
by bernulli 5y ago
I disagree. I think learning to learn, and, first, learning to motivate yourself to learn is a huge part of a college education with the goal to prepare you for a life in which boundary conditions change all the time. What happens to thos
66.
by bernulli 5y ago
That's got nothing to do with west vs. poor. Have you seen the 2-year French math requirements before you are even admitted to an engineering school? Have you seen German universities where there is zero advisement and where your t
67.
by bernulli 5y ago
But the material is not the problem. You have the whole world knowledge at your fingers, in books, the internet, etc. Schaum's outline will give you hundreds of worked problems. The problem is that the student sees no possible solution
68.
by bernulli 5y ago
It puts the responsibility on the student, like it will be on the job. You have all the material on this planet at your disposal. Works in other countries: lectures and classes for two years and then one final exam. No quizzes, homeworks, e
69.
by bernulli 5y ago
Tried that after discussion with students, with the result that no one did homework and the learning outcome completely collapsed.
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by bernulli 5y ago
The article perfectly reflects my experience teaching STEM in the last semester. Instructional material that led to rave reviews and amazing student outcomes the years before now results in similar reviews like “lost a lot of respect for th
71.
by bernulli 5y ago
It's really cool how a Mach number emerges from traffic flow, with speed of cars vs speed of information, completely with shock waves and everything!
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by bernulli 5y ago
43 is still much less than 303, according to the math I learned in school.
73.
by bernulli 5y ago
Just read my first post and that should tell you everything that was wrong with your title. Because you insist on your alternative fact that 303 is somehow less than 39, I think propaganda is the right interpretation of the spin you are try
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by bernulli 5y ago
Well, you should have 'judged relevance' that more carefully then, because your submitted title is factually wrong, by a long shot.
75.
by bernulli 5y ago
Which is not what your headline submission says. Also, the article makes no statement about the relation to the vaccination status.
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by bernulli 5y ago
The propaganda headline has nothing to do with the article and also is completely wrong. According to [1], daily deaths now at 39, but on 01/31/2021 7 times that at 303. [1] https://www.worldometers.info/coronaviru
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by bernulli 5y ago
Sure. But another key feature of how the turbine works is -- that it spins. That means that you need bearings and seals that can not only withstand but actually work effectively under those conditions.
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by bernulli 5y ago
Sure, and in the gas turbine combustor there are also no moving parts. But there’s lots going on outside.
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by bernulli 5y ago
You don't have the full temperature of the chamber b/c of the film cooling discussed in the article. Also, the chamber doesn't spin at tens of thousands of rpm.
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by bernulli 5y ago
In Germany, the overall entry requirement is a not horrible high school degree (type of high school intended to prepare for an academic career) for engineering. You can just go and sign up to the university of your choice. The flip side is
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by bernulli 5y ago
Minor nitpick: fluids are not either liquids or gases, this is particularly true for rocket engines where many of the discussed processes (injection, compression, regenerative coolant flow) actually occur at super- or transcritical conditio
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by bernulli 5y ago
Also try to imagine the thermal stresses when you have cryogenic propellants on the pump side and hot exhaust gases (gas generator or staged combustion) on the turbine side!
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by bernulli 5y ago
Excellent detailed advice by the others in this thread. Let me add what I think you can bring to the table: a track record in getting things done. The only thing a professor has less of than money is time. If you can convince a PI that you
84.
by bernulli 5y ago
Interestingly, it’s an entirely different class of flow! A traffic jam is akin to a shockwave in compressible flow (e.g. gas), here the article talks about (incompressible) liquids.
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by bernulli 5y ago
It's really not - just by having more hardware available (at higher total expenses) doesn't make the pool of money available (public research funding) to book time on these things more. These things are one-off, you build a new o
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by bernulli 5y ago
He was decidedly not right. His claim was that neural networks are fundamentally not able to perform an XOR step, limiting any relevant computational capabilities. That claim was easily remedied later by slightly changing network architectu
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by bernulli 5y ago
It's a really tough question of when to pull the plug. Marvin Minsky wrote a whole book in 1969 'proving' that neural nets cannot, fundamentally, do anything interesting - yet, here we are.
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by bernulli 5y ago
Thank you!
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by bernulli 5y ago
Is there a set of measures/activities holding up better to scrutiny that you could recommend?
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by bernulli 5y ago
You can very much model expansion in a nozzle as isentropic, but I did miss the part where the original comment was restricted to JT. Thanks!

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