The negative polarity (-) lightning strikes the conventional air-termination (lightning rod), but the positive polarity (+) lightning, which occurs more frequently in winter, ...

MIKE MOSS SAYS: John, Most of the newer lightning display graphics used by on-air meteorologists discriminate between strikes having negative polarity (transferring negative charge to the surface ...

Researchers have developed a novel negative-stiffness isolation device that offers a pioneering solution for seismic protection. The device, designed to provide multidirectional negative stiffness ...

(a,b) Seismic reflection images. Note that a negative polarity at the branch (panel ii) and at several locations of the plate boundary (panels iii–vi) suggests a sudden velocity reduction ...