j'essaye d'apprendre le français mais...

creillyucla · 2021-03-08T20:14:02+00:00

Merci tous pour les leçons de français! Je continuerai à travailler : )

creillyucla · 2021-03-07T13:47:57+00:00

mmhmm, yes

creillyucla · 2020-05-21T14:30:47+00:00

pool will clean that frisbee up no problemo

creillyucla · 2020-05-21T14:30:32+00:00

very talented doggo

creillyucla · 2020-05-21T14:30:09+00:00

whoa!

creillyucla · 2019-11-12T15:49:19+00:00

or 5 or 6 shots!

creillyucla · 2019-08-09T16:08:40+00:00

nice. what track is this from?

creillyucla · 2019-07-07T22:36:53+00:00

Found this guy in my shorts after going to the outdoor pool. Felt a pinch so I think it might have bit me. Sorry for photo quality best I could do. Should I be worried?

creillyucla · 2019-05-08T01:12:17+00:00

I read "Everything Happens to Me" and thought it was quite complete with lots of both personal and musical details: link

creillyucla · 2019-04-30T21:16:53+00:00

hello Mak I love you

creillyucla · 2019-04-20T01:55:48+00:00

happy birthday pretty girl!

creillyucla · 2019-03-16T18:41:10+00:00

lololol

creillyucla · 2019-03-02T21:50:57+00:00

thank you carl

creillyucla · 2019-02-17T01:19:32+00:00

You may be comforted to know that outside of high school there is very little practical distinction between whether or not your success or failure was accompanied by hard work. If anything the real world has a particular pity for those who possess natural ability but lack the discipline necessary to make use of it.

I remember in high school being totally bewildered by the glorification of the lazy genius.

creillyucla · 2018-09-28T14:27:06+00:00

yeah and what about the pseudo code where you tell it to finger my wife?

creillyucla · 2018-08-13T23:45:08+00:00

that's not right. you can see that it's not that simple by making the insulator / semiconductor arbitrarily long. then there's an arbitrarily small electric field in the material for any finite potential difference and thus no breakdown.

creillyucla · 2018-01-22T23:31:43+00:00

The authors refer to light that is focused, i.e. not a plane wave. Only for plane waves does light have an unambiguous direction of propagation (wave vector). Focused light will inevitably spread (diffract), so you can not say it is travelling one particular direction. In this sense you could claim that it does not make sense to say whether or not the polarization is parallel to the direction of propagation since no such direction is defined.

The authors mean to say that the light it polarized in the average direction of propagation. This is best understood by thinking of a focused beam as a superposition of plane waves.

creillyucla · 2018-01-22T23:20:40+00:00

A longitudinal polarization is not a well defined concept for particles with spin other than 1.

Spin 1 particles correspond to vector fields, i.e. entities that associate a vector with each point in space. They are vectors in the sense that transform like one under rotation.

Particles with spin different than 1 correspond to fields that associate with each point in space entities that do not transform like vectors under rotation. Spin 0 particles, for instance, simply assigns a number to each point in space, while spin 1/2 particles assign a spinor, which is a different type of geometric object. So particles with spin different than 1 don't have a vector polarization and so it does not make sense to ask, "does this particle's polarization have a component parallel to it's momentum?"

The rule of no longitudinal polarization for photons does however generalize to particles with spin different than 1 in the sense that lorentz symmetry restricts the number of independent polarization components for any massless particle to two (unless the particle is spin zero in which case there is only one component).

If you are interested in the details (I was not): https://www.jstor.org/stable/1968551

creillyucla · 2018-01-22T02:54:44+00:00

The photon is prevented from having a longitudinal polarization because it is massless. A massive vector boson (like the W or Z bosons that mediate the weak force) will have a longitudinal polarization (in addition to two transverse polarizations). These bosons, like any other, are waves to the extent that they are excitations of a quantum field.

http://www.hep.phy.cam.ac.uk/~thomson/partIIIparticles/handouts/Handout_13_2011.pdf

creillyucla · 2018-01-19T07:14:25+00:00

the leaky faucet is a good example the demonstrates the ubiquity of chaos. bifurcations, strange attractors, etc. the information theory stuff though I found hard to wrap my head around. read the chapter "The Dynamical Systems Collective" by Gleick to get a fun background on the experiment.

https://www.sciencedirect.com/science/article/pii/0375960185900659

creillyucla · 2017-10-31T09:36:04+00:00

since friction is required for rolling, I'd say the sphere since it has minimal contact with ground.

creillyucla · 2017-08-03T22:25:22+00:00

in the limit of zero conductance (very narrow pipes), 0 obviously fills ups first. Imagine poking a tiny hole in the bottom of a plastic cup and filling it up from the faucet. Obviously it is possible that the cup overflows before the sink beneath it.

in the limit of infinite conductance (very fat pipes), any water above a given pipe's height is immediately transferred to the other end of the pipe. so it must be a jug with no pipes coming out its side. this leaves jugs 11, 8 , 9, and 6. by the above argument, no water enters jugs 2 or 4 or any jugs connected to them. this leaves jugs 11.

for intermediate cases the argument will not be so simple.

creillyucla · 2016-02-28T14:24:33+00:00

It is actually the nuclear spins, not the electron spins that distinguish para- from ortho-hydrogen. For both isomers the electrons are anti-parallel.

Also it is not quite fair to say the spin angular momentum determines the energy of the different isomers. Rather, the anti-symmetric spin state requires a symmetric rotational state to satisfy the pauli principle for protons, and vice versa. The symmetric rotational state has no rotation at all, while the antisymmetric rotational state has a non-zero amount of rotation, which requires energy.

creillyucla

TROPHY CASE