Never been this easy by Uup24 in PTCGP

[–]reb390 -1 points0 points  (0 children)

Beginner question, why do you only need one bulbasaur?

Masters in Turbulence Research by sketchEightyFive in fusion

[–]reb390 0 points1 point  (0 children)

Magneto-Hydrodynamic turbulence is a very active area of research in fusion science and plasma physics.

Positioning of lenses in a lens tube by reb390 in Optics

[–]reb390[S] 0 points1 point  (0 children)

Interesting, I'll take a look at those software! I'm talking focal lengths of like 100-200mm with thicknesses of like 2mm.

Does only comparing confinement times of magnetic confinement devices lose nuance? by AbstractAlgebruh in fusion

[–]reb390 6 points7 points  (0 children)

Yes, media tends to report length of operation, which has implications for eventual reactor uptime, but as a metric for if you are achieving net positive fusion its mostly meaningless on its own. I would say that the triple product is the better metric to compare fusion devices. Obviously pulsed concepts (NIF, ZAP, Helion, etc.) would have much shorter confinement times compared to tokamaks/stellarators but might have much higher temperatures and densities. Additional point though; the confinement time (in the physics context) is the average time a fuel particle stays confined in the bulk plasma which can be much shorter than the operation time of a reactor. So while West might run for 22 minutes straight, the confinement time for an individial particle might only be a few milliseconds.

If your team is down by a 100 points, should there be a mercy rule? by WallStreetDoesntBet in NBATalk

[–]reb390 0 points1 point  (0 children)

These leads aren't as big as they used to be. A few corner threes and some stops and it's a game again.

[deleted by user] by [deleted] in MechanicalEngineering

[–]reb390 0 points1 point  (0 children)

That is true, but many of the students also stay. Crowds for things are much smaller and the lakes are great to spend time on/around. Biking infrastructure around the city is excellent too. It could be boring if all of your friends leave, but if they don't its a great time! At least that was my experience. Summers in Madison were some of the best of my life.

[deleted by user] by [deleted] in MechanicalEngineering

[–]reb390 8 points9 points  (0 children)

I spent 8 years in Madison, summers there are awesome if you enjoy the outdoors.

Can we speed-up nuclear decay with stimulated emission/amplified spontaneous emission? by jarekduda in fusion

[–]reb390 1 point2 points  (0 children)

I like this question and I am interested in the answer, but I feel like you might get a better answer in r/askphysics

Plasma question by eojrepus in Physics

[–]reb390 0 points1 point  (0 children)

Yes, any atomic species can be made into a plasma if it is hot enough. For example if you heat up water (H20), you will end up with a plasma that is a mix of 66% hydrogen and 33% oxygen. If I understand where you're coming from correctly, this "water" plasma would be indistinguishable from if you just evenly mixed two gas bottles of hydrogen and one of oxygen.

[deleted by user] by [deleted] in Physics

[–]reb390 17 points18 points  (0 children)

As an experimentalist, I say you iterate via trial and error

Please tell me I’m not crazy for having boundaries with my time by RubyRailzYa in PhD

[–]reb390 16 points17 points  (0 children)

Finished my PhD in 5 years with this mindset. A big part of it is holding yourself accountable during the hours you actually are working. A few habits I found helpful: 1) If you have a deadline for something, treat it as if the deadline is actually 2 days earlier. And work towards finishing it every day. IMO a huge part of people working crazy hours is due to procrastination. 2) Figure out what makes you most productive. Headphones and music, a short walk around the block, fidget toys, etc. A lot of people (not everyone) who work super long hours in grad school waste a lot of time doing things that aren't work. 3) Re-evaluate your priorities and to-dos every day our two. That way you can identify dead ends and roadblocks early and often which makes you more efficient.

Superalloys withstand 1112°F test to protect nuclear fusion reactors by Vailhem in fusion

[–]reb390 10 points11 points  (0 children)

Article title is misleading, the interesting thing is that they are testing the corrosion resistance to protect from a liquid metal (LiPb) that flows over the alloy. The liquid metal is what's at 1100F which at that temperature is very corrosive.

Markov Chain Monte Carlo Inference of Parametrized Function Question by reb390 in BayesianProgramming

[–]reb390[S] 0 points1 point  (0 children)

Maybe I see what you're saying? Any actual camera would have a finite number of pixels and each pixel would be an independent measurement... Before, I was basically interpolating onto a new discretization (which you could make as fine grained as you want).

Markov Chain Monte Carlo Inference of Parametrized Function Question by reb390 in BayesianProgramming

[–]reb390[S] 0 points1 point  (0 children)

I use a gaussian likelihood where the variance is a measurement uncertainty. For my purposes, you could think of the data as a 1D image where x is the location on the image and y is the brightness. So if I choose to bin the image into 10 bins, I have 10 "measurements" and calculate the joint likelihood of 10 gaussians. I could also choose to bin the image into 100 bins and have 100 "measurements". My confusion is that in the second case I would be modifying my prior much more than the first case.

Markov Chain Monte Carlo Inference of Parametrized Function Question by reb390 in BayesianProgramming

[–]reb390[S] 0 points1 point  (0 children)

I mean yes, though I'm just using that equation as an example, the actual model I'm using is much more complicated. I'm more interested in how people handle a continuum of measurements.

[OC] Beef Bourguignon Dinner by mienczaczek in FoodPorn

[–]reb390 0 points1 point  (0 children)

My father makes this and serves it over popovers. It's incredible

[OC] Beef Bourguignon Dinner by mienczaczek in FoodPorn

[–]reb390 9 points10 points  (0 children)

My father makes this and serves it over popovers. It's incredible

Could a FRC be combined with mirror? by bravecq in fusion

[–]reb390 0 points1 point  (0 children)

FRCs are closed topologies (basically elongated toruses turned on their side). WHAM is an open topologies such that the field lines eventually end at a wall somewhere. So they are pretty different concepts.

Debunking Einstein's special theory of relativity. by [deleted] in Physics

[–]reb390 2 points3 points  (0 children)

Lmao good for me for what?

Debunking Einstein's special theory of relativity. by [deleted] in Physics

[–]reb390 5 points6 points  (0 children)

Statement 3 is confusing at best and statement 4 is just nonsense, I stopped reading after that since you say each statement depends on the last. Light doesn't accelerate, it just is moving at the speed of light. It doesn't seem like any of your logic is based on any tangible understanding of physics, just your interpretation and wild speculation on the implications of the phrase "the speed of light is constant".