i think the main focus are different, jina is more on searching multimedia data, image, video things like that - things that can not easy to be solved by classic symbolic search/keyword matching
The very first non-navigation-bar text on the linked site says: "The Next Generation Spaced Repetition Tool to help you Retain More Knowledge: Create memory cards anywhere on the web", which should give some clues. A little lower down there's a link saying "Click here to check out our 5 minute introduction to spaced repetition", linking to ... a brief explanation of spaced repetition and why you might want to use it.
Anyway. The idea is that when you learn something, you are likely to forget it eventually, and that when you _remind_ yourself of something you've learned that postpones the likely forgetting by an amount of time that increases according to how long it was since you learned it. So if you want to learn something and retain it, you should keep reminding yourself just before you would have forgotten. Fortunately, it seems that for most of us the time we remember a thing for is somewhat longer than the time between reminders, which means that learning something this way doesn't take an unreasonable number of reminders before it's lodged in your brain long-term.
So: a spaced repetition system is a thing that helps you learn. You give it a bunch of things you want to learn; it tests you and remembers -- separately for each individual thing -- when you were last tested and how you did. If its algorithm matches your brain reasonably well, a fairly small investment of effort can help you get a lot of stuff imported lastingly into your brain.
The most common use of these things is for learning foreign language vocabulary, but of course that's by no means all you can do with them.
During my classes, I always see waves going up and down to represent sound or magenetic waves. I really cannot visualize in real life. What exactly the ups and down in real time?
I don’t know if this will help you but it is how i think about it.
Just keep in mind that the waves you see plotted aren’t a direct physical model like you might find in the chapter about forces. In those topics you can directly represent a pully or a lever and depict force vectors and distances and their relationship within the system right on the page.
Waves drawn to represent sound or AC current or RF are confusing because they look like waves in the ocean so the brain just inserts that somehow. However, those waves are really a derived value that plots the field/pressure/current intensity over time (or distance). Imagine they are being drawn by a small plotter hooked to a sensor at some point in space and the up and down movement of the ink on the page is just the change in pressure/intensity over time at that spot.
This is closer but the problem with this image is that the particles all have a laminar motion back and forth. The reality is that it's like quadrillions of superballs bouncing in random directions and these density fluctuations are only really evident in larger scale aggregations of particle motion.
For electromagnetic waves, as i understand it, there isn't actually movement up and down in space; there are oscillations in the electric and magnetic fields. Which do somehow have a spatial direction, which is why light can be polarised. I don't have an intuition for it at all!
The challenge with the longitudinal example, which is of course technically correct, is that it’s hard to map it to the spherical shells that most of these phenomena radiate into.
For sound those waves are the pressure level along the line. It only really visualizes things in 1 dimension. This picture shows the relation between the wave that's usually drawn and a view of what the wave would look like if you could see the air.
Magnetic waves are different. The height of the wave in a diagram of magnetic waves represents the strength and direction of a magnetic field at a point in space.
After working in a particularly magnetics heavy project at work an analogue that I found works better is picturing the flux lines as “fluidic” and emulating common fluid behavior. For example, having a ferromagnetic material within a magnetic field is like having a funnel in a fluid stream. Taking this analogue along with an intuitive understanding of Maxwell’s equations really gives you an intuitive understanding of magnetics for applied sciences (ie DivB = 0 means that in any bounded region the number of field lines entering = number of field lines leaving).
Of course all of this is only good up to the point you start looking at magnetics at the material science level. Then you really need to internalize it is a quantum mechanics effect and commit to learning the hard science behind it.
Veritasium has a good video on the “levels of explanation” of magnetic fields and you really need to decide how deep you want to go.
Be careful not to confuse the map with the territory. These ups and downs are a graph of something, such as the pressure in a sound wave. It’s the pressure, a number, that goes up and down as the sound wave passes by.
No. You already have peace! Being in peace is the natural form -- the only way of being. Everything else is like a dream, created by our mind... imagined.
> If I have goals, then I will chase something
True, I think.
Now I'm thinking... if pain is imagined... can I chase without imagining pain? I think so. I/You can do anything.
Do what you want, but don't define yourself by what you do. Be free of whatever defines you. Can I write this comment without letting it define who I am... not yet. but I'm working on it.
Things/goals are not bad, they have no energy, I give things energy. Imagine a heavy refrigerator in my kitchen, as long as I leave it alone it does not bother me, if I try to move it, It starts to resist... I feel no weight until I give energy to it, heck I can even break my back trying to move it :)
You may ask, what is wrong with being defined by them?
For the one who does not know himself (like me) it would be an ugly lie. A lie that brings pain.
> How is it possible?
By first distinguishing you from what is driven by you.
I don't believe in traditional meditation that requires one to sit. I believe we are all so close to our own being and peace that we only need to stop and enjoy it! It could be anywhere, anytime in any form!
Believe that you already have it! Believe that you are complete and nothing needs to be chased/changed/added/removed from whatever remains of you when are not defined by anything. In that moment of pure being and joy, you start to realize that your are! You ARE everything and nothing -- including the ego, definitions and more. In that moment, things have no meaning but you become the meaning in everything.
1. NewRelic.com
2. Datadoghq.com
3. Atatus.com