Yun Che Wang

TL;DR: The experimental realization of this composite approach is described by embedding negative-stiffness inclusions of ferroelastic vanadium dioxide in a pure tin matrix, which exhibits extreme mechanical damping and large anomalies in stiffness, as a consequence of the high local strains that result from the inclusions deforming more than the composite as a whole.

TL;DR: In this paper, a review of properties and applications of thin-film metallic glasses (TFMGs) is presented, including solid-state amorphization upon annealing, the glass-forming ability improvement due to thin film deposition, and mechanical properties, including residual stress, hardness and microcompression, adhesion, and wear resistance.

TL;DR: Observations of five gigantic jets that establish a direct link between a thundercloud and the ionosphere at 90 km elevation indicate that the extremely-low-frequency waves were generated by negative cloud-to-ionosphere discharges, which would reduce the electrical potential between ionosphere and ground.

TL;DR: In this paper, the human buttocks were modeled as an ideal sphere with radius 15 cm, and assumed to have a low Young's modulus and a Poisson's ratio close to 0.5.

TL;DR: A simple spring model with pre-load to achieve negative stiffness is considered and when suitably tuned to balance positive and negative stiffness, the system shows a critical equilibrium point giving rise to extreme overall stiffness.