@Slereah In fact (slightly special) consumables are a pretty good choice for such arrangements. You quiz people who know your designated recipient to find out if he like beer, or wine or coffee or tea or chocolate or whatever and then try to buy a quality example for just about the price limit.
But avoid thing that the person is a fanatic about. That is don't try to buy wine for a wine snob, nor coffee for someone who roasts their own and had a hand-cranked burr grinder in their office.
There are several conditions that must be met in order for a force to be conservative.
One of them is that the curl of that force must be equal to zero?
What is the physical intuition behind this?
If you can, please explain it to me via the magnetic force fields because i have read that time-vary...
> The rate of fall of the voltage across the capacitor depends upon the inverse product of capacitor C and the effective resistance RL used in the circuit and is called the time constant.
> The RC time constant, also called tau, the time constant (in seconds) of an RC circuit, is equal to the product of the circuit resistance (in ohms) and the circuit capacitance (in farads)
In first definition of time constant,what it means by “inverse product of” ?
Borland proved incapable of supporting Delphi. The eventually sold it to a company called Embarcadero, but they have badly mismanaged it over the last few years.
@BernardoMeurer if you're going to make a career out of programming in XXX you need to be confident the language XXX is going to be kept up to date and competitive with other laguages out there.
Well Perl is a bit like Javascript. It was hacked together to suit a purpose, but it was always poorly designed and better languages are out-competing it.
@BernardoMeurer That the primitives are on the type itself and at least in all the examples doc.rust-lang.org/std/primitive.f64.html, x.exp() rather than exp(x). Though I guess you can using exp from f64 and then use exp(x) or something?
The other thing that put me off last time I tried was that some basic functionality, like rng generation, is only complete for f64, and not available for f32.
But I would much prefer C++ style template overloading of exp, so I could just exp, and it'd know the type and call either f32::exp or f64::exp or whatever.
Though I am aware that C++ also has a proposal to have some universal calling system or whatever so you could x.f(y). This is fine for nonmathematical functions but for maths it looks wrong to me.
I didn't look at it, but my point being maybe that if they cared about floating point performance and numerical (math) performance, the way or order of things have been built would have been different
Latest commit on simd was months ago and I think when I took a look people were still discussing some fundamentals on the issue page
I agree, and C++ started out being slow and shunned by Fortran and C devs. I guess it's just that even though I've tried, I've found Rust not to be mature enough even for my hobby projects for now. I am hoping that'll change.
The language features are for library builders. With all the features of newer C++ you can build stuff that indeed is difficult to read but if you expose a nice API to clients, no harm done.
But the biggest things to hit C++ in "modern C++" is really I think unique_ptr making people think about stuff like ownership. Which was then baked into the core of Rust.
The library I work with was originally written way before move semantics, so it's (custom) shared pointers everywhere, essentially a global variable cause you don't know who owns it. Oh well.
@CooperCape the sphere is a two dimensional closed manifold. We traditionally draw it embedded in a three dimensional space, but it remains two dimensional i.e. you can label all points on the sphere with just two coordinates.
One of our maths gurus will probably be along any moment to explain why my description isn't quite right, but that's the basic idea :-)
"In mathematics, a fundamental polygon can be defined for every compact Riemann surface of genus greater than 0" - from wikipedia. Don't expect me to understand that :o
wait @Slereah wiki says "In mathematics, a fundamental polygon can be defined for every compact Riemann surface of genus greater than 0" and your picture has a sphere but doesn't a sphere have genus 0?
I wonder if the same idea can work in reverse: Using optically active molecules to create a barrier so that it slows down or even prevents heat from being absorbed into the system
It will be a very good and tunable heat insulation if the opposite direction works
Otherwise, still a very good advancement in technologies that store waste heat
Some other random thoughts which may not make sense: We often talk about storing energy. But is it sensible to think about technologies that store entropy?
We have more conclusive experimental detection of positron production in thunderstorms, and this research is possible, well exceeding its original goal thanks to crowdfunding
While plastic scintillator can be tough to acquire, we've found that many universities have been part of experiments which purchase/make their own scintillator. Besides buying the scintillator from a company like Eljen, talk to some of the physics professors.
Let us consider a theory defined by an action on a flat space $S[\phi]$ where $\phi$ denotes collectively the fields of the theory. We will study the theory on a general background $g_{\mu\nu}$ and then we will set the metric to be flat.
The Euclidean partition function of the theory in the pres...
I am not sure if there are other companies that produces scintillators, though given there are unis everywhere, there should be some somewhere in the neighbourhood
http://www.cosmicwatch.lns.mit.edu/detector#steps anyway, the detailed build instruction page of theirs seemed to go very detailed on the various way to acquire and machine the components. I am still a bit surprised that you might need to mill the scintillators before use though
