Crushers play an important role in the comminution of minerals and the control of its operation can lead to an increase of the plant throughput and efficiency. This work presents a simple but effective method for controlling a crusher circuit by acting over the feeder and the speed of the conveyor belt carrying out the mineral up to the crusher. Guidelines for tuning the strategy, as well as pr...

Periprosthetic fractures after total knee arthroplasty (TKA) are gradually increasing, reflecting extended lifespan, osteoporosis, and the increasing proportion of the elderly during the past decade. Supracondylar periprosthetic femoral fracture is a potential complication after TKA. Generally, open reduction and internal fixation are the conventional option for periprosthetic fracture after TK...

This paper describes the use of a multi-objective evolutionary algorithm to solve an engineering design problem determining the geometry and operating settings for a crusher in a comminution circuit for ore processing. The outcome is a tool for consulting engineers that can be used to create and explore candidate designs for various scenarios. The tool has proved capable of deriving designs tha...

UNIVERSITY OF PENNSYLVANIA ORTHOPAEDIC JOURNAL comminution. Correction to a volar tilt of 11 1/2 5 degrees has been shown to restore biomechanical function of the wrist. Prior to the use of volar locking plates, in order to restore volar tilt it would be necessary to use a dorsal approach, bone graft, and a dorsal plate. In the case discussed in this paper osteotomy and bone graft was used due ...

The commonly used extensive approaches to the distal tibia include the posteromedial and anterolateral approaches. The current report describes several cases performed using this technique establishing a rationale and safe zone for performing a transfibular approach to the distal tibia. The advantages of such approach are the excellent visualization of the lateral tibia and the articular space....

Two years ago I laid before the Society a suggestion for facilitating the perforation and comminution of the foetal head in cases of contracted pelvis where it was impossible to extract a living child at term. The basilyst, the simple instrument which I subsequently showed to the Society, was intended first to be used for perforating the vault of the skull, and then to be passed on so as to per...

This paper describes the use of a multi-objectiveevolutionary algorithm to solve an engineeringdesign problem determining the geometry andoperating settings for a crusher in acomminution circuit for ore processing. Theoutcome is a tool for consulting engineers thatcan be used to create and explore candidatedesigns for various scenarios. The tool hasproved capable...

Complex fractures of phalangeal bones in the hand are difficult to treat. External fixation is an effective method of treatment particularly when internal fixation is not possible due to comminution and associated soft tissue injury. A variety of commercial fixators are available for the treatment of hand fractures. However, these fixators are costly and need a sufficient degree of expertise an...

Box 88.1 lists the signs and symptoms of fractures and complications that indicate serious injury. In general, forearm fractures are classified by the bone (or bones) involved, anatomic location, trajectory of the fracture and alignment of the fracture fragments, and the presence of angulation, rotation, comminution, and concurrent dislocations. All fractures should be further described as open...