Digital avulsions and amputations are not uncommon in outdoor activities. Rope entanglement is often the cause, though specific descriptions of the mechanism of injury have not been reported. We report a common scenario where entanglement during a fall resulted in an amputation injury. Although any roping activity may cause a loop formation leading to digital entrapment and subsequent amputatio...

On the 28th November an old Mahomedan cultivator, of about 50 years, was admitted as an in-patient in the hospital with a gaping wound across the right armpit, attended with recurrent hremorrhage. The wound was produced accidentally ten days ago in the following way. Whilst leading two bullocks tied to each end of a rope, the loop of which was hanging down from his right shoulder, the animals w...

I. MOTIVATION The way how humans maintain balance during standing and locomotion has been an active area of research for many years now, with applications in bipedal robotics, leg prosthetics, and rehabilitation. However, most studies are limited to standing and walking on immobile surfaces, or on externally perturbed platforms and treadmills. Less is known about unstable, passive support surfa...

In this paper, we describe a novel camera calibration method to estimate the extrinsic parameters and the focal length of a camera by using only one single image of two coplanar circles with arbitrary radius. We consider that a method of simple operation to estimate the extrinsic parameters and the focal length of a camera is very important because in many vision based applications, the positio...

-A technique to numerically obtain the static equilibrium s ta te of a conventional dragline excavation system is reported, including static pose of the bucket as well as internal loads acting on elements of the excavation system. Equilibrium conditions are generated by numerically integrat ing the dynamic equations of motion with the hoist and drag rope lengths fixed. It is shown tha t this me...

Classical knot theory is about the classification, up to isotopy, of embedded closed curves in three-dimensional space. Two closed curves embedded in three-dimensional space are said to be isotopic if there is a continuous family of embeddings starting with one curve and ending with the other curve. This definition of isotopy captures our intuitive notion of moving a length of elastic rope abou...

This paper deals with stage motion control system for scene manipulation during theater performance. Particular task of rope drum control is presented and solved. The system exhibits an oscillatory dynamics due to the elasticity of the rope with a hanging load. The goal was to find a simple control strategy based on a common cascade PID structure which is available in most of the industrial AC ...

[1] Flux ropes have long been observed in the upper atmosphere of Venus and more recently at Mars. Here we present magnetic field measurements of flux ropes encountered at the southern terminator of Mars by Mars Global Surveyor and compare them to a flux rope model. This allows several parameters of each rope to be inferred. Remarkably similar flux ropes are met repeatedly at the southern termi...

This paper is a continuation of work originally undertaken by the authors which predicts the static pose of a 1:20 scale dragline bucket and rigging throughout its workspace. Based on the results of this prior work, a two degree of freedom pendulum model is used to describe the dynamic response of the bucket to a small velocity inputs of the drag-rope. Linear differential equations, valid for s...