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December 01 2014

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November 14 2014

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September 08 2014

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BBC News - Hemp fibres 'better than graphene'

The waste fibres from hemp crops can be transformed into high-performance energy storage devices, scientists say.
They "cooked" cannabis bark into carbon nanosheets and built supercapacitors "on a par with or better than graphene" - the industry gold standard.
"...if you look at hemp fibre [...] it makes sheets with high surface area - and that's very conducive to supercapacitors."
The first step, he explained, "is to cook it - almost like a pressure cooker. It's called hydrothermal synthesis.
"Once you dissolve the lignin and the semicellulose, it leaves these carbon nanosheets - a pseudo-graphene structure."
Fully assembled, their energy density is 12 Wh/kg, which can be achieved at a charge time less than six seconds.
Interconnected Carbon Nanosheets Derived from Hemp for Ultrafast Supercapacitors with High Energy
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21 GIFs That Explain Mathematical Concepts

var imagebase='file://D:/Program Files (x86)/FeedReader/'; 21 GIFs That Explain Mathematical Concepts 15:55 27.08.2014, Maxx, amazing, World Of Technology “Let's face it; by and large math is not easy, but that's what makes it so rewarding when you conquer a problem, and reach new heights of understanding.”

Danica McKellar

As we usher in the start of a new school year, it’s time to hit the ground running in your classes! Math can be pretty tough, but since it is the language in which scientists interpret the Universe, there’s really no getting around learning it. Check out these gifs that will help you visualize some tricky aspects of math, so you can dominate your exams this year.

Ellipse:
Solving Pascal triangles:
Use FOIL to easily multiply binomials:

Here’s how you solve logarithms:

Use this trick so you don’t get mixed up when doing matrix transpositions:

What the Pythagorean Theorem is really trying to show you:

Exterior angles of polygons will ALWAYS add up to 360 degrees:

If you’re studying trig, you better get pretty comfortable with circles. Check out this visualization that shows what you’re really looking at when you deal with pi:


If an arc of a circle is the same length as its radius, the resulting angle is one radian:

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 lines:

Flipped on its side, the shape begins to make more sense:
Converting a function from Cartesian to Polar coordinates:

Drawing a parabola:

The Riemann sum is the approximate area under a curve:

Hyperbola:

Translating that into 3D, you get a hyperboloid. Believe it or not, it’s made with completely straight lines:

Seriously. You can even make it do this:


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September 01 2014

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Skills and their honour ;)
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Trust me, I'm an engineer...
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August 31 2014

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August 30 2013

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June 03 2013

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May 12 2013

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February 27 2013

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OH ... art i love you <3
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February 07 2013

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