almost home
Aqua Utopia｜海の底で記憶を紡ぐ
I'd rather be in outer space 🛸
Misplaced Lens Cap
Show & Tell
Claire Keane
trying on a metaphor
@theartofmadeline
🪼
Game of Thrones Daily
PUT YOUR BEARD IN MY MOUTH
shark vs the universe
pixel skylines
⁂
macklin celebrini has autism
Product Placement
Sweet Seals For You, Always
RMH
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todays bird
seen from T1
seen from Netherlands
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@madscientistworld
This is our 2016 FSAE Prototype, the Minuano. This is the car that we were going to use on the 2016 Lincoln FSAE Competition, but our team had some problems with the shipment and the car couldn’t go, unfortunately. Anyway, we went to the competitions and it was awesome to learn new things and make friendship with engineering students across the entire world. :)
If you want to know about its technical specs or something like that, feel free to ask me!
Farmbot
Open source product is a robotic computer controlled home farming setup to grow your own food:
FarmBot Genesis is humanity’s first open-source CNC farming machine designed for at-home automated food production.
More Here
Waves contain lots of information. They are also time invariant, which means that they will behave the same regardless of whether time moves forward or backward. This isn’t a property we observe often in life since time just moves forward for us. But a new experiment has demonstrated a method of wave control that can, in a sense, roll back the clock.
To do this, the scientists created a instantaneous time mirror, or ITM. When they create a disturbance on the surface of a pool of water, it sends out capillary waves in the form of ripples. A short time later, they accelerate the pool sharply downward. This universal disturbance is their instantaneous time mirror, which generates backward-propagating ripples. Those new backward-propagating waves travel back toward the source and refocus into the shape of the initial disturbance. This works for both a simple point disturbance (top image) and for a more complicated geometry like a smiley face (bottom image). (Image credit: V. Bacot et al., source; submitted by @g_durey)
Feeling of Nostalgia & Time Travel.
There is no need to read this entire text (only if you really want to), I was just thinking and writing without a cause.
I’ve created this blog almost exactly three years ago, at July of 2013. Going through the stuff that I used to post, I can see the older me ambitions and desires, and I like it. The older me used to re-blog and post things about physics, math, engineering, and every little thing that correlates with science and knowledge. You know, although he didn’t understood all of the things he posted, he was very curious about them and found’em lovely.
I think that the older me would be very proud of the person I’ve become today. Now I’m a Control Engineering student at a great university here at my country, making tons of cool projects, teaching physics and math, and really learning a lot of awesome stuff.
You know, this is just like time travel, and that’s fucking awesome. I’m revisiting all my past and remembering the things I used to like and love. I’m a very nostalgic person, I like to remember and keep stuff so I can think about the changes that occurred in my life.
WARNING OF SILLY STUFF AHEAD:
You know, you can visualize happiness/sadness function making an analogy with the third Maxwell equation of electromagnetism (the Maxwell–Faraday equation). Suppose that the electric field is the happiness/sadness function, if there is no variation in the things that occur in your life, you won’t be happy or you won’t be sad, you are just going to be neutral (zero).
Anyway, I think I’m going to come back to this and start reblogging some stuff, I really liked doing so. :) Maybe a little different, don’t know yet. Wait for me.
G.
SCIENCE SIDE OF TUMBLR, MAKE IT HAPPEN!!!!
I WANT THIS. ALL OF THIS
They have the hole puncher one already. But these are great.
Visualizing sine (red) on the Y axis and cosine (blue) on the X axis. The relative position of the circle is shown in black:
This shows the same thing, but a bit more simply:
Here’s how sine and cosine apply to triangles:
Cosine is the derivative of sine:
Tangent…
Funny pictures of the day (100 pics)
Harrison Ford And Car Names
ehnu:
This is what multivariable calculus does to you.
I can’t wait to do double and triple integrals!
"Glassified" Ruler by MIT Media Lab Automatically Measures Angles, Volume, and Shape Properties.
[source]
I need one of this. Amazing!
In a previous post, I showed how to geometrically construct a sine-like function for a regular polygon.
I also pointed out how the shape of the function’s graph depends on the orientation of the polygon, since it isn’t perfectly symmetric like the circle.
This animation illustrates how the polygonal sine (dark curve) and polygonal cosines (clear curve) change as the generating polygon rotates.
Derivation
First of all, it is important to point out these functions are not based on the perimeter of the shape, like it is for the unit circle. We’re still sticking to the interior angle here. If we used the perimeter as a substitute for the angle we would just get a deformed linear spline of the sine function, which is rather useless and boring.
In order to find these functions for an arbitrary polygon, we first need to write the polygon in polar form. That is, we want the radius for a given angle. In a circle, this is a constant value.
A general “Polar Polygon” function is:
PPn(x) = sec((2/n)·arcsin(sin((n/2)·x)))
Where n is the number of sides of the polygon. If n is not an integer, the curve is not closed.
Armed with this function, we can quickly find the polygonal sine and polygonal cosine:
Psinn(x) = PPn(x)·sin(x) Pcosn(x) = PPn(x)·cos(x)
As n grows, the functions approximate the circular ones, as expected. To rotate the polygon, just add an angle offset to the x in PPn.
This technique is general for any polar curve. Here’s a heart’s sine function, for instance
So, what is it good for?
I’ve used this several times when I wanted some smooth interpolation between a circle and a polygon, in such a way that the endpoints of the interpolation are a perfect circle and a perfect, pointy polygon. It’s useful in parametric surfaces, such as in this old avatar of mine:
Now you can also listen to what these waves sound like
holy shit
omg
it’s back
doctor who -> minimalist
Cosmos: A Spacetime Odyssey - Part 4
TOP RESEARCHERS COMMENT AS THE “GRAVITATIONAL WAVE REVOLUTION” RIPPLES THROUGH THE SCIENTIFIC COMMUNITY Nature | News by Ron Cowen || 18 March 2014
The evidence of gravitational waves from the early Universe found by researchers working at the South Pole has been hailed as a landmark discovery in cosmology, astronomy and physics. The announcement was made by astronomer John Kovac on 17 March at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts. … Here Nature has collected reactions from leading researchers.
Please go to the open access article in Nature to read the comments (and see who made them) …
‒ “… many great intellectual discoveries are never confirmed at the time when the authors are still alive. I’m not dead yet and they are already seeing this gravitational-wave signal.” [Comment from one of the discoverers/creators of the theory of cosmic inflation]
‒ “Nobel prize material, no question. It’s not everyday that you wake up and learn something fundamentally new about the Universe, a telegram from the very earliest moments of the Universe. … just in time for the one-hundredth birthday of Einstein’s general [theory of] relativity next year.”
‒ “If the BICEP2 result holds up, this is really big — as important as the discovery of dark energy, cosmic microwave background anisotropy or the Higgs boson. …” ______________________________
Top Amundsen-Scott South Pole Station, with the BICEP2 telescope on the right. [Robert Schwarz/University of Minnesota] Middle/Bottom: credit: BICEP2 Collaboration / Nature Magazine, 17 March 2014
Morning On Mars
Martian sunrises, as seen by the HiRISE orbiter
