Jose Mondragon @7_codon

@radioactivered really enjoy your posts and your take on rad. Perhaps you meant to say bremss from e is due to the atomic electrons that provide the repulsive force that the deflects this electron which then emits a photon due to conservation of energy. Tx, great account btw

NEWSOM: Fox News needs to keep paying the price until they change the way they do business. I just wanted a simple apology. Own up to your lies. They refused. They thought they would get this thrown out. And this judge said hold on boys and girls — lets get ready for discovery.

@macjshiggins And I am looking for an imaging sensor to complete the diagnostic. my university lab is funded by a us govt agency but r cash strapped, all people in my lab are usa citizens. where can i acquire a surplus lwir/mwir camera for this. if u dm me i can give u website to my lab. Tx

@macjshiggins Hello, i run a university lab in the southwest USA. My lab is focused on pulsed power driven high energy density physics plasmas. I want to image the instabilities from these sources and i want to field a phase contrast imaging diagnostic to do so. This pci uses a CO2 LASER.

i really cannot express enough how completely fucking baffled i am that people choose to live in places where there's a winter. you just have fucking *months* of the year where it's a freezing hell to go outside, where your skin dries and cracks and bleeds, where you have to constantly shovel snow and de-ice roads, where all the trees die and the animals hide, where the sun disappears and you're trapped inside in darkness again and again. and you just *live with it* YOU CAN MOVE!!! NOT EVERYWHERE IS LIKE THIS!!! THIS IS NOT A FUNDAMENTAL FEATURE OF THE PLANET!!!!! THERE IS PLENTY OF SPACE!!!!! IF YOU LEAVE NOW YOUR CHILDREN WON'T BE TRAPPED INTO ACCEPTING AND NORMALIZING THE HELLSCAPE YOU RAISED THEM IN!!!!

Lecture 2 on our Quantum Mechanics Series Schrödinger’s equation doesn’t start from mystery. It starts from a very specific bet…the state of a particle is a complex field ψ(x,t), and whatever dynamics we write down must move ψ forward in time in a way that preserves total probability. We ask a basic question…what equation should ψ satisfy so that |ψ|² behaves like a conserved density, the way mass density does in fluid flow? What is ψ? Think of ψ(x,t) as the amplitude assigned to “the particle is at position x at time t”. It’s not a probability. It’s the object you add first, and only at the end do you square p(x,t) = |ψ(x,t)|² Because ψ is complex, it has magnitude and phase. Write it in polar form ψ(x,t) = r(x,t) exp(i θ(x,t)) Then r² = |ψ|² is the density, and θ will end up controlling flow (the probability current). Where does Schrödinger’s equation come from? Start with two empirical inputs about waves and particles: E = ħ ω p = ħ k Here ħ (“h-bar”) is Planck’s constant divided by 2π. It’s the unit conversion factor between the wave description (frequency ω, wavevector k) and the particle description (energy E, momentum p). In units, ħ has units of joule-seconds, so multiplying ω (1/seconds) gives energy (joules), and multiplying k (1/meters) gives momentum (kg·m/s). It’s the number that tells you how much energy or momentum you get per unit frequency or wavenumber. A plane wave with angular frequency ω and wavevector k is ψ(x,t) = A exp(i(k·x − ω t)) Now notice what derivatives do to this wave: ∂ψ/∂t = −i ω ψ ∇ψ = i k ψ ∇²ψ = −|k|² ψ Multiply those identities by ħ: i ħ ∂ψ/∂t = ħ ω ψ = E ψ −i ħ ∇ψ = ħ k ψ = p ψ −ħ² ∇²ψ = ħ² |k|² ψ = p² ψ So for plane waves, the operators Ê = i ħ ∂/∂t p̂ = −i ħ ∇ act like energy and momentum! Now use the classical nonrelativistic energy relation: E = p²/(2m) + V(x) This is bookkeeping for a particle moving slow enough that relativity can be ignored. The term p²/(2m) is kinetic energy. If p = mv, then p²/(2m) = (m²v²)/(2m) = (1/2)mv². The term V(x) is potential energy. It depends on position because forces come from spatially varying energy. A slope in V pushes the particle. Examples: for a charged particle in an electric potential φ(x), V(x) = q φ(x). Near Earth, V(z) = mgz. The point is total energy equals kinetic plus potential. Turn that into an equation for ψ by replacing E and p with the operators above: Ê ψ = (p̂²/(2m) + V) ψ Compute p̂² = (−i ħ ∇)·(−i ħ ∇) = −ħ² ∇², so we get i ħ ∂ψ/∂t = ( −ħ²/(2m) ∇² + V(x) ) ψ That is the time-dependent Schrödinger equation. The derivation here is a controlled heuristic: we matched the plane-wave identities to the measured relations E = ħω and p = ħk, then imposed the same energy bookkeeping as classical mechanics. Why this equation is the right kind of rule If ψ is the state, we need a rule that preserves total probability: ∫ |ψ(x,t)|² dx = 1 Schrödinger evolution does. You can see it by deriving a continuity equation. Let ρ(x,t) = |ψ|² = ψ* ψ. Take a time derivative: ∂ρ/∂t = ψ* ∂ψ/∂t + ψ ∂ψ*/∂t Use Schrödinger and its complex conjugate: ∂ψ/∂t = (1/(i ħ)) ( −ħ²/(2m) ∇²ψ + Vψ ) ∂ψ*/∂t = (−1/(i ħ)) ( −ħ²/(2m) ∇²ψ* + Vψ* ) Plug in. The V terms cancel exactly, and what remains can be rearranged into a divergence: ∂ρ/∂t + ∇·j = 0 where the probability current is j = (ħ/(2mi)) ( ψ* ∇ψ − ψ ∇ψ* ) This is the best way to explain ehat ψ is: |ψ|² behaves like a conserved density, and the phase of ψ is what drives the current j. So in this series, ψ isn’t a slogan. It’s the object whose modulus squared is the density, whose phase generates flow, and whose time evolution is fixed (up to V) by matching wave relations to energy bookkeeping: i ħ ∂ψ/∂t = ( -ħ²/(2m) ∇² + V ) ψ #QuantumMechanics #SchrodingerEquation #WaveFunction #BornRule #Physics #MathematicalPhysics

Non-rhetorically and non-ironically: Abolish ICE.

LongTime🤓FirstTime👨‍💻 @LongTimeHistory

10 months ago

ICE surround judge's car threatening to smash windows—then detain his high school intern. Agents handcuff teenager to arrest him—until judge fights loudly to demand they check ID to confirm they have wrong person. Court security noticed masked men sneaking pictures of the boy

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@oldestasian Cool, I’ll keep an eye out for it and when I move forward with it of course due credit will be given! Thanks

The LAPD shot a woman at point blank range with a rubber bullet all because she was asking to get to her home. She posed absolutely no threat. This is what Trump’s America looks like.

Yep, that's how it taste.

Acyn @Acyn

a year ago

“Tasted a little tear gas— tasted like fascism”

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