Ex-News Junkie
Some professional stuff
Sat Nov 11, 2017 5:40pm

Science Magazine Abstract ... "We measured the elastic properties and intrinsic breaking strength of free-standing monolayer graphene membranes by nanoindentation in an atomic force microscope. The force-displacement behavior is interpreted within a framework of nonlinear elastic stress-strain response, and yields second- and third-order elastic stiffnesses of 340 newtons per meter (N m–1) and –690 Nm–1, respectively. The breaking strength is 42 N m–1 and represents the intrinsic strength of a defect-free sheet. These quantities correspond to a Young's modulus of E = 1.0 terapascals, third-order elastic stiffness of D = –2.0 terapascals, and intrinsic strength of σint = 130 gigapascals for bulk graphite. These experiments establish graphene as the strongest material ever measured, and show that atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime."

Fermilab video - Relativity's Key Concept: Lorentz Gamma

Fermilab video - Einstein's Clocks

Isaac Arthur - The Cosmic Ocean

  • Starship Size ComparisonEx-News Junkie, Mon Nov 6 6:17pm
    Below is a comparison of the sizes of a Space Elevator Ring, and a Starship Ring, neatly sandwiched between the Earth and the Moon's orbit. Image is to scale in units of km.
    • Some professional stuff — Ex-News Junkie, Sat Nov 11 5:40pm
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