Abstract: In this article, a coupled axial-torsional drill-string vibration model is established, which considers the influence of bit balling on rock-breaking and drill-string vibration. First, a bit ...

Abstract: In this article, we investigate the state estimation problem for a class of networked systems with energy harvesting technologies, where the sensor is capable of replenishing energy from the ...

Can you chip in? This year we’ve reached an extraordinary milestone: 1 trillion web pages preserved on the Wayback Machine. This makes us the largest public repository of internet history ever ...