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difalcojr's latest activity
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difalcojr
replied to the thread
B
Questions about the Paraxial equation for a single spherical surface
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Yes, thanks, many authors use these approximations. Along with the other approximations they use in the derivation. Incident 'iota'...
11 minutes ago
D
difalcojr
replied to the thread
B
Questions about the Paraxial equation for a single spherical surface
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Yes, I agree that isn't realistic. Consider, though, that this equation itself measures only one position of the one ray, the axial...
Today, 10:29 AM
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difalcojr
posted the thread
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Questions about the Paraxial equation for a single spherical surface
in
Optics
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Today, 8:48 AM
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difalcojr
reacted to
DaveC426913's post
in the thread
Wood/Glass/Metal
Plushie Jail
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Like
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Another angle showing the grid of shock cord. All gaps are 5.5" BTW, child safety has been factored in. Shock cord is trivial to move...
Yesterday, 1:37 PM
D
difalcojr
replied to the thread
Wood/Glass/Metal
Plushie Jail
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Nice design. As long as he cannot pull the whole thing onto himself as he falls backwards, pulling the cords toward himself, and the...
Yesterday, 1:36 PM
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difalcojr
replied to the thread
Tom Swift - young scientist, engineer, and inventor
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Here's how the covers evolved: 1st series: 1913-1941 2nd: 1954-1971 (both shown are 1954, #1 and #4) 3rd: 1981-1984 and 4th...
Yesterday, 12:44 PM
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difalcojr
posted the thread
Tom Swift - young scientist, engineer, and inventor
in
Science Fiction and Fantasy Media
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Tom Swift and Tom Swift Jr. books for young readers (ca. 8-9 to 14-15) are not in publication now, but have a history of over 100 years...
Yesterday, 12:22 PM
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difalcojr
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Janus's post
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It's still not clear to me what's the limit of light propagation
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Like
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"Tends to" but never reaches. It's like the equation y= 1/n, it tends to 0 as n approaches infinity, but since n can never reach...
Yesterday, 11:30 AM
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difalcojr
reacted to
Dale's post
in the thread
I
It's still not clear to me what's the limit of light propagation
with
Like
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Why would it? There isn't a limit of energy, there is a fixed energy. Energy is conserved. It cannot appear, but it also cannot...
Yesterday, 11:29 AM
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difalcojr
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Baluncore's post
in the thread
A
How does phase of merging sines affect overall periodic tones?
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Yes, from medical science, auditory research, and from signal processing. Consider a repeating waveform from a musical instrument, or...
Monday, 7:40 PM
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difalcojr
reacted to
sophiecentaur's post
in the thread
A
How does phase of merging sines affect overall periodic tones?
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Like
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As you say, it's a very complicated business; your hearing system is very sophisticated and can drag out a lot of information about a...
Monday, 7:40 PM
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difalcojr
reacted to
Hornbein's post
in the thread
History
Interesting anecdotes in the history of physics?
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Like
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I always thought it exceptionally unfair that Alpher and Gamow didn't get the Nobel for the Big Bang prediction while the two...
Sunday, 4:24 PM
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difalcojr
reacted to
fresh_42's post
in the thread
History
Interesting anecdotes in the history of physics?
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The following concerns a question in a physics degree exam at the University of Copenhagen: "Describe how to determine the height of a...
Sunday, 4:24 PM
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difalcojr
reacted to
pinball1970's post
in the thread
History
Interesting anecdotes in the history of physics?
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Like
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The Alpher–Bethe–Gamow paper (sources wiki and https://www.aps.org/publications/apsnews/200804/physicshistory.cfm) I don't think this...
Sunday, 12:47 PM
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difalcojr
reacted to
pines-demon's post
in the thread
History
Interesting anecdotes in the history of physics?
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Like
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Gamow on the Soviet bullies George Gamow says about Igor Tamm:
Sunday, 12:47 PM
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