Aboard a sailboat, when the wind changes unfavourably for our course, we can adjust the sails. We perform the operation of pulling a rope—but when the rope is fastened to the sail as a sheet, pulling the rope means adjusting the sail, while also paying attention to the wind, the sea current, the movements of the boat. The rope-with-sail is the very rope we are pulling: a sociomaterial entanglem...

Let us begin with definitions. Fix two points A and B in R. We shall always assume that A = (0, 0, 0) and B = (1, 0, 0) so, in particular, the line AB is the x-axis and the length of the interval [AB] is equal to 1. (We shall write [AB] for the closed interval between A and B, (AB) for the corresponding open interval, and AB for the line passing through A and B.) A rope is a non-singular C-smoo...

The LASCO and EIT instruments on the SOHO spacecraft have provided an unprecedented set of observations for studying the physics of coronal mass ejections (CMEs). They provide the ability to view the pre-event corona, the initiation of the CME and its evolution from the surface of the Sun through 30 R ⊙. An example of the capability of these instruments is provided in a description of a single ...

The origin of the Moreton wave observed in the chromosphere and the EIT wave observed in the corona during the eruption remains being an active research subject for a while. We investigate numerically in this work the evolutionary features of the magnetic configuration that includes a current-carrying flux rope, which is used to model the filament, after the loss of equilibrium in the system ta...

In the operation of aerial ropeways, system load-bearing and running skyline system, which provides ability to move passengers or transported cargo between endpoints route, experiences a high level loading from variety operational loads environmental influences. Those influences form rope tension that is variable along route has decisive influence on main technical economic parameters mobile th...

In crane automation systems, precise knowledge of the load position is a key factor for fulfilling positioning accuracy requirements. This contribution presents a nonlinear observer design for harbor cranes which makes use of gyroscope measurements. Both single-pendulum load configurations and more complex double-pendulum configurations are considered. The gyroscope sensors are attached to the ...

In this work we study the problem of rope sway dynamics control for elevator systems. We choose to actuate the system with a semi-active damper mounted on the top of the elevator car. We propose nonlinear controllers based on Lyapunov theory, to actuate the semi-active damper and stabilize the rope sway dynamics. We study the stability of the proposed controllers, and test their performances on...