Two different-level schemes are researched in this article for achieving the kinematic control of redundant manipulators, one of which is exploited at the acceleration level, and the other is at the jerk level.Firstly, they are both reconstructed as a standard quadratic programming problem with different parameter definitions and addressed by a gra
This paper presents a novel steering mechanism embedded in a point-the-bit rotary steerable system (RSS) for oilfield exploitation.The new steering mechanism adopts a set of universal joints to alleviate the high alternative strain on drilling mandrel and employs a specially designed planetary gear small tooth number difference (PGSTD) to achieve d
Over the past 200 years, the evolution of human society has moved inexorably toward greater interaction and interdependence between peoples and nations around the world.More recently the movements advancing free trade, globalization, liberal democracy, multilateral institutions and international cooperation have lost momentum and are in retreat.Thi
The abundance of sperm relative to eggs selects for males that maximize their number of mates and for females that choose high quality males.However, in many species, males exercise mate choice, even when they invest little in their offspring.Sexual cannibalism may promote male choosiness by limiting the number of females a male can inseminate and
Estimation of black-box functions often requires evaluating an extensive number of expensive noisy points.Learning algorithms can actively compare the similarity between the evaluated and unevaluated points to determine the most informative subsequent points for efficient estimation of expensive functions in a sequential procedure.In this paper, we