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Edward Teller - A difficult differential equation (77/147) 

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To listen to more of Edward Teller’s stories, go to the playlist: • Edward Teller (Scientist)
Hungarian-American physicist, Edward Teller (1908-2003), helped to develop the atomic bomb and provided the theoretical framework for the hydrogen bomb. He remained a staunch advocate of nuclear power, calling for the development of advanced thermonuclear weapons. [Listener: John H. Nuckolls]
TRANSCRIPT: I had, in that connection myself, something of a difficulty. The whole work seemed to be planned by Johnny von Neumann. Well, he told us about methods to produce in high explosives a spherical convergent motion. But the question, the hydrodynamics of an imploding shell, required a solution of differential equations that looked to me anything but simple. The Head of the Physics Department, of the theoretical work, Hans Bethe, wanted me to do this calculation. I begged off. It looked to me impossible to form- perform in an accurate manner. And there was a way out, because by that time, computers had made a lot of progress and instead of accurate analytic solutions, we could work with computer solutions, with numerical solutions. That would not have been, in itself, so hard. The difficulty was that the whole situation was a kind of motion which we call unstable. If we have a little inaccuracy in it, that the sphere was not quite a sphere, a shell was not a uniform shell but at some place it was a little thinner than at other places, then this lack of symmetry will grow. And to avoid that and to produce something really reliable, seemed to me a very difficult problem. I begged off. I don't think Bethe ever forgave me. Oppenheimer apparently, I think, in fact, understood. He let me do things that I felt I could accomplish better.

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25 сен 2017

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Комментарии : 18   
@NothingMaster
@NothingMaster 4 года назад
If Von Neumann couldn’t have come up with analytical solutions to those differential equations, at that time, no-one could.
@charleyhoward4594
@charleyhoward4594 11 месяцев назад
doubt that
@ArnoldSommerfeld
@ArnoldSommerfeld 11 месяцев назад
doubtful
@TheGsoffer
@TheGsoffer 6 лет назад
Cool!!
@BuGGyBoBerl
@BuGGyBoBerl 3 года назад
what exactly was the difficult part he thought? finding a numerical solution that takes care of that unstable situation or to find a analytical one? i know the problem was that its unstable but was he looking for a numerical or analytical one?
@shoopinc
@shoopinc 3 года назад
Numerical solutions can go unstable and do quite often.
@BuGGyBoBerl
@BuGGyBoBerl 3 года назад
@@shoopinc yeah sure, you have to be quite careful modelling it. but do you know what he referred to?
@shoopinc
@shoopinc 3 года назад
@@BuGGyBoBerl Yes the hydrodynamics of an imploding shell. So you would do some kind of navier stokes in spherical coordinates plus a forcing function pushing the explosion inward if you want the full behavior. But even if you do accomplish this task which will be numerically extremely stiff, the instability due to asymmetry will make it diverge from the real thing anyways.
@wasserstein5110
@wasserstein5110 Год назад
@@shoopinc sry for necro how would a modern day approach look like?
@nurlatifahmohdnor8939
@nurlatifahmohdnor8939 Год назад
Page 1228 teller = n 1 a bank cashier. 2 a person appointed to count votes. 3 a person who tells; narrator.
@nurlatifahmohdnor8939
@nurlatifahmohdnor8939 Год назад
Page 192-1 ATM: Mesin juruwang automatik (Automatic Teller Machine).
@alexismarquez3674
@alexismarquez3674 2 года назад
IT'S NOT THE MATERIAL THINGS THAT CAPTURES TRUE LOVE. A SIMPLE GESTURES OF FLORENTINO S. SUSALO III MAKES ME HAPPY 😊
@TheLuminousOne
@TheLuminousOne Год назад
go to sleep teller.
@_Nibi
@_Nibi 2 года назад
is this dude even speaking English?
@lawman3966
@lawman3966 Год назад
His spoken language is Martian but written using the English alphabet.
@rajuaditya1914
@rajuaditya1914 Год назад
Go away troll.
@johnschuh8616
@johnschuh8616 7 месяцев назад
He is a very old man speaking not in his native tongue.
@stxa2594
@stxa2594 12 дней назад
If you can't understand him it's most obiously due to your lack of vocabulary.
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