We present a topological model for energy storage and subsequent release in a sheared arcade of either infinite or finite extent. This provides a quantitative picture of a twisted flux rope produced through reconnection in a two-ribbon flare. It quantifies relationships between the initial shear, the amount of flux reconnected and the total toroidal flux in the twisted rope. The model predicts ...

The object of this research is to determine the effect 6 weeks rope training on delicate skills elementary school girl students. study has been done in semi experimental method. Statistical society includes all students fourth grade which are learning Tanavarz National Project and education 121 schools Babul city. sample selected randomly first Stage 3 then any 1 class class, about 15 have sele...

As part of the ocean winch, traction winch mainly plays role attenuating load tension. It generally uses simple speed control. For ship-based collection and release system, complex sea conditions make cable tension constantly changes. The traditional control method will in too slack or tight. Meanwhile, it can result wrong rope, bite rope slippage, other phenomena. Eventually, is leading to dam...

A special type of representation for knots and for local knot manipulations is described and used in a software tool called TOK to implement a number of algorithms on knots. Two algorithms for knot simplification are described: simulated annealing applied to the knot representation, and a “divide-simplify-join” algorithm. Both of these algorithms make use of the compact knot representation and ...

Rotational control and swing suppression of a crane suspended load model with traveling disturbance are studied. A rotational free rigid body suspended by a single rope is controlled using three inertia rotors. The end-supporting-point of the single rope is forced to be traveled as disturbance. Control angles and angular velocities are derived from measured data of fiber optic gyros installed o...

Using Monte Carlo simulations, we investigate the possibility of an orientational melting transition within a "rope" of carbon nanotubes. When twisting nanotubes bundle up during the synthesis, orientational dislocations or twistons arise from the competition between the anisotropic intertube interactions, which tend to align neighboring tubes, and the torsion rigidity that tends to keep indivi...

A 40 year old man sustained a flaccid paralysis of his right upper extremity in a water skiing accident on August 22nd, 1976. At the time of the injury the patient was being towed on water skis, when another boat cut across his tow rope. The force of the boat hitting his tow rope, combined with the wakes of both boats, caused the patient to be thrown forcefully into the air, with his right arm ...

Multi-rope elevators are widely used in modern buildings. However, problems such as vibration, noise, uneven wear of key components and shortened life caused by the distribution rope tensions still unsolved elevator industry. In order to balance different axial deformation each rope, a novel automatic equipment for rope-type (NABE-RE) is proposed this article. Simulations based on Simscape nume...

Surface wear caused by contact between crane wire rope and a pulley seriously affects the mechanical properties of rope. In this study, tribological behavior was investigated using homemade rope–pulley sliding friction test rig. Then, influence different surface on bending fatigue life samples analyzed. The results show that coefficient (COF) decreases with increasing distance. It reaches minim...