Two mathematicians have proved that a straightforward question — how hard is it to untie a knot? — has a complicated answer.

Abstract: The four-level nested neutral point clamped (4L-NNPC) converter is a new multilevel converter with a simple structure and no power device in series, which is suitable for medium-voltage high ...

Abstract: This paper addresses the challenges posed by imperfect detection and uncertain parameters, such as detection probability and noise covariances, in target tracking. We introduce an Adaptive ...

A recently discovered asteroid roughly the size of a commercial jet will pass within 1 lunar distance of Earth on Sept. 3. Here's how you can watch the build-up to the flyby live online, courtesy of ...

How likely you think something is to happen depends on what you already believe about the circumstances. That is the simple concept behind Bayes' rule, an approach to calculating probabilities, first ...