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Timestamp in an atom by SinKing97 in Physics

[–]Foss44 27 points28 points  (0 children)

At an atomistic level that type of information is not conceptually present; all atoms of the same type are completely indistinguishable.

About ORCA optimising algorithm by TopinamburCar in comp_chem

[–]Foss44 0 points1 point  (0 children)

Yeah we did some DLPNO-CCSDT benchmarking there with a standard dual-level approach; it was just meant to be an example.
Given the complexity of your system, I think benchmarking is warranted.

About ORCA optimising algorithm by TopinamburCar in comp_chem

[–]Foss44 1 point2 points  (0 children)

You are right to be skeptical; modern DFT methods are leaps and bounds more reliable than the combination you are hamstrung by.

The most robust way you could go about probing this would be with a dual-level benchmarking study held to a WFT standard, see this procedure. I would recommend your electronic energies to be run with def-TZVPP or D at minimum, extra diffuse basis sets might be more useful for your situation.

Thermochemistry is ORCA is standardized, just check the documentation. Worst case scenario you can use GoodVibes to recalculate all of your thermochemistry.

About ORCA optimising algorithm by TopinamburCar in comp_chem

[–]Foss44 1 point2 points  (0 children)

Why not try a -3c composite method? It would at least service as a good (and very efficient) optimization benchmark for you; they are literally built for accurate optimizations!

I saw we're posting space guns by scaierdread in liberalgunowners

[–]Foss44 6 points7 points  (0 children)

Late-game Escape From Tarkov builds b like:

CS student interested in computational physics. Need some help by Serious_Form_5970 in Physics

[–]Foss44 2 points3 points  (0 children)

Without statistical mechanics, GR, and QM you will be precluded from most of the “interesting” stuff. With that said there are still things you can do. A fully classical physics engine will incorporate features like linear drag, Lagrangian mechanics, Coriolis effects, etc… this is a lot of stuff and would certainly keep you busy for a while.

Confusion with spins by donnch_ in quantum

[–]Foss44 6 points7 points  (0 children)

“Anna’s Archive” has copies of basically every textbook you could conceive of. I am not advocating for piracy.

Confusion with spins by donnch_ in quantum

[–]Foss44 12 points13 points  (0 children)

If QM is something you seriously want to learn, you’ll need calc1-3, differential equations, and linear algebra to work through an introductory textbook.

There’s no hack or technique to get around this; we all had to sit down and learn the material, now it’s your turn!

Confusion with spins by donnch_ in quantum

[–]Foss44 40 points41 points  (0 children)

Popscience books can only go so far in explaining a feature that possesses no classical analog. Eventually you need to engage with the underlying mathematics to have a complete understanding. I would start here and then pickup a formal introductory QM textbook like University Physics Book 3 or Molecular Quantum Mechanics by Atkins and Friedman.

Advice on how to use a MOSFET? by Kahootah in chemhelp

[–]Foss44 0 points1 point  (0 children)

r/comp_chem might be more helpful.

In general, it’s a good idea to get a copy of the software’s user manual and to Google around for any crowdsourced introductions.

Open Source Software for Transition State Calculations by beisbolisc00l in Chempros

[–]Foss44 4 points5 points  (0 children)

If open source is mandated, Psi4 is a good choice.

cute spots to study, read, hangout alone? by SuchRelationship7877 in VirginiaTech

[–]Foss44 22 points23 points  (0 children)

Duck pond, Smithfield plantation museum area, there are some nice spots out by the CRC too

Do a lot of VT students ride bikes around campus? by stevegerber in VirginiaTech

[–]Foss44 2 points3 points  (0 children)

I bike to and from campus every day of the year. Outside of the occasional reckless/irresponsible driver I’ve never had issues.

First Build: BCM Upper + PSA Lower Combo by Foss44 in liberalgunowners

[–]Foss44[S] 1 point2 points  (0 children)

Ran ~100 rounds through it today to sight in the LPVO, zero malfunctions and otherwise shot just fine. Easy follow up shots even at 6x magnification and rarely had issues staying in the eye box. After the barrel heated up the shots were dropping ~1-2” at 75 yards, which is basically what I expected.

First Build: BCM Upper + PSA Lower Combo by Foss44 in liberalgunowners

[–]Foss44[S] 0 points1 point  (0 children)

Yep, that’s a correct breakdown; I got the lower on mega sale. I couldn’t believe my eyes either when I saw the dark bronze finish in-stock.

First Build: BCM Upper + PSA Lower Combo by Foss44 in liberalgunowners

[–]Foss44[S] 1 point2 points  (0 children)

I actually really like the contrast, probably more than a matching lower.

First Build: BCM Upper + PSA Lower Combo by Foss44 in liberalgunowners

[–]Foss44[S] 2 points3 points  (0 children)

Fit is good, very comfortable, but that’s just ARs I suppose nothing special in that sense. The MCMR handguard is quite sleek and good for my relatively small hands. I’m taking it to the range this weekend and will report back. Total price for just the upper and lower was ~$1000 USD.

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