Comparative geology suggests that the continents adjacent to northern, western, southern, and eastern Laurentia in the Late Proterozoic were Siberia, Australia-Antarctica, southern Africa, and Amazonia-Baltica, respectively. Late Proterozoic fragmentation of the supercontinent centered on Laurentia would then have been followed by rapid fan-like collapse of the (present) southern continents and...

Moral dilemmas often pose dramatic and gut-wrenching emotional choices. It is now widely accepted that emotions are not simply experienced alongside people's judgments about moral dilemmas, but that our affective processes play a central role in determining those judgments. However, much of the evidence purporting to demonstrate the connection between people's emotional responses and their judg...

This paper addresses the issue of difficulties in servicing brake pipe connectors for passenger cars, service life which exceeds 8‒10 years, is associated with deteriorated loosening connectors. The existing ways to loosen pipes have been investigated, especially those whose dismantling complicated due corrosion and contamination mated surfaces as a result their wetting when driving car. A conv...

The author says in the preface : " Nothing but a strong conviction of being in the right could justify the author of the following pages for expressing views which must give a violent wrench to preconceived opinions, and which will almost certainly be met with opposition from all parties. In justice to himself, and as some explanation of the revolutionary statements here made, it may be added t...

According to the problem of screw fracture of electric submersible pump unit in Shengtuo oilfield, the reasons for the screw fracture are analyzed from three aspects: material, strength and pretightening force. The preliminary result shows that the imbalanced pretightening force of screw is the main reason of screw fracture. By means of Ansys software, the static and modal analyses for the elec...

This paper describes RUR53, the unmanned mobile manipulator robot developed by the Desert Lion team of the University of Padova (Italy), and its experience in Challenge 2 and the Grand Challenge of the first Mohamed Bin Zayed International Robotics Challenge (Abu Dhabi, March 2017). According to the competition requirements, the robot is able to freely navigate inside an outdoor arena; locate a...

A framework tackling the problem of large wrench application using robotic systems with limited force or torque actuators is presented. It is shown that such systems can Ž . apply a wrench to a limited set of Cartesian locations called force workspace FW , and its force capabilities are improved by employing base mobility and redundancy. An efficient numerical algorithm based on 2 -tree decompo...