#materialsciences — Public Fediverse posts

Notes on #UAP Discussions : Here #DisclosureTeam with #VinnieAdams interviews #RichardDolan on the history of UAP research. The discussion is not just academic ; students and newcomers will benefit from the perspective and references…
https://youtu.be/nCjVYWad_aY?si=lMkwwpOAkDNNQRay

It’s important to note wrt purposes here that for myself and others the subject of #UAP only came into intense focus when it became apparent that #Physics, #MaterialSciences and other disciplines will all leap forward.We are not ufologists-

Mysterious “quantum echo” in superconductors could unlock new tech. Via @sciencedaily_official #Science #Physics #QuantumPhysics #QuantumMechanics #ParticlePhysics #MaterialSciences 🔭🔬🧪🥼🧑‍🔬 #ComputerSciences

Mysterious “quantum echo” in s...

Scientists built a transistor that could leave silicon in the dust. Via @sciencedaily_official #Science 🔭🔬🧪🥼🧑‍🔬 #ComputerSciences #MaterialSciences

Scientists built a transistor ...

Here's something that might be beneficial to the scientists out there, doing research in chemistry, material science, life sciences or pharmaceutical sciences: three times a year, we hold series of nine coffeelectures, 10 minute intros to a database, a software tool or some other thingy closely related to science. We show some reasonable use cases and give pointers to other related resources. Since last year, we also make these available via youtube. Check out our backlog on our channel: www.youtube.com/@icbpeth
#coffeelecture #science #scientist #chemistry #chemiverse #biology # lifesciences #materialsciences #pharmaceuticalsciences

Re Strong research background in physical sciences & engineering? Ready to lead a small team? Apply before 5 July!
#Mathematics #Physics #Chemistry #ComputerScience #Engineering #UniverseSciences #EarthSciences #MaterialSciences

🐦🔗: https://n.respublicae.eu/ERC_Research/status/1675772683189878784

2021-03-26, 19:05, Friday

I promised a few paragraphs about x-ray diffraction, so here it goes. This is mostly unedited because I’m tired and lazy.

Basically, light has a property to undergo what’s called diffraction: shine a laser beam on a grated piece of plastic and beam will split into an uneven number of new beams. Using this pattern and some trigonometry you can calculate the wavelength of light if you know how fine the grating is and the angle between beams. This works only when wavelength is a few times smaller than the grating size.

Now, the important bit is that atoms in crystal sort of work like grating. Light reflects from different layers of atoms differently and this forms the same diffraction pattern. Since the distance between atomic layers determines the structure of the crystal, we can now measure it using light and some math called Bragg’s law. The only thing we need is a light source with fixed, well-known and very small wavelength. Now, the “grating” in our case is approximately 2-4*10^-10 m, or 2-5 angstrem.

Conveniently, metallic anode, when put in a vacuum and under high voltage, emits high energy photones, generally of a fixed wavelength, corresponding to the valent electron’s excited state. And if we use copper, this wavelength is roughly 1.51 angstrem, which is about what we need.

Now that all elements are in place, we just need to build a complex machinery that will hold our sample, put a piece of copper under a few kilovolts, cool it down simultaneously, while also rotating a detector to capture light intensities under a range of angles. Different lattices will give different diffraction patterns, and one can be calculated from another.

And this is more or less how x-ray diffraction works.

#qotojournal #science #xrd #materialsciences