The h Bar

Sir Cumference

00:08

Oh wow TIL fuzzy logic actually has applications

JMac

My friend was doing some work on fuzzy logic for health care applications with a professor once. TBH I hadn't even really heard of it until then, but it sounded like a really cool approach

skillpatrol

> Michael Hanss, 2005. Applied Fuzzy Arithmetic, An Introduction with Engineering Applications. Springer, ISBN 3-540-24201-5

Sir Cumference

+1 for non-boolean logic

there's an entire rabbit hole of weird kinds of logic

Vector logic

Vector logic is an algebraic model of elementary logic based on matrix algebra. Vector logic assumes that the truth values map on vectors, and that the monadic and dyadic operations are executed by matrix operators. "Vector logic" has also been used to refer to the representation of classical propositional logic as a vector space, in which the unit vectors are propositional variables. Predicate logic can be represented as a vector space of the same type in which the axes represent the predicate letters S {\displaystyle S} and P...

skillpatrol

+0.999... for weird kinds of logic :P

roobee

00:33

so solar sails convert light to kinetic energy. but it they are very inefficient. is there some theoretical limitation or just we have not practically found a good material yet?

is there some mechanism that can reversibly convert light to kinetic energy? sorta like the piezoelectric effect except with light instead of electricity?

roobee

01:10

if heat is atoms vibrating why can't we cool atoms to absolute zero by harvesting the thermal motions? i know thermodynamically this is impossible by not sure why kinetically it doesn't work.

JMac

@roobee Temperature basically tells you where the thermal energy is going to go when two objects are brought together. So to harness the "vibrations", or thermal energy, of those atoms you need to have something with weaker thermal motion for that energy to want to naturally transfer. To get something near absolute zero to give it's thermal energy to something warmer, you need to do work on the system, which costs energy.

roobee

@JMac That is the thermodynamic argument which I agree is experimentally correct. I am confused when thinking kinetically why I can't place tiny piezoelectric sensors (with rectifiers so the average current > 0) on a object to convert the thermal motions to electricity

JMac

01:29

@roobee How would the piezoelectric sensors be able to get anything from that? From a "kinetic" perspective, unless the sensor material is colder, it has more average kinetic energy than the substance you're trying to take energy from

roobee

@JMac I was thinking the random motions of the material would bump into the piezoelectric sensor to convert into electricity?

JMac

@roobee But how would they take the energy from the atoms when the atoms trying to take the energy have more energy on average?

roobee

@JMac when thinking of energy conservation that is a good point. Although I'm not sure how the piezoelectric effect functions from a kinetic perspective. I was modeling it as a black box.

roobee