Fermi-level pinning by misfit dislocations at GaAs interfaces has been investigated. n -GaInAs was used to control the misfit dislocation density by varying of composition and epilayer thickness. interfaces with zero or low dislocation densities are Ohmic to current flow, and become rectifying with increasing dislocation density. The "Schottky barrier height" increases with dislocation density ...

Recurrent dislocation of the patella probably has several causes. In many patients abnormal laxity of the knee is present and this may predispose to dislocation (Dc Palma 1954). A family has come to our notice in which three members suffered recurrent dislocation of the patella and a fourth had probably sustained a single dislocation. All the former had abnormally lax knees and most other joint...

Traumatic anterior hip dislocation is a rare condition compared to posterior dislocation and recurrent anterior hip dislocation is encountered even less. Myasthenia gravis is a chronic autoimmune neuromuscular disease characterized by various degrees of muscle weakness. Closed reduction is the first choice of treatment for traumatic, non-recurring hip dislocation. We report a 59-year-old female...

introduction fracture - dislocations of the talus are typically due to high energy injuries. displaced fracture - dislocations of the talus have poor outcomes in general and complications are common. although talar fracture is common and comprises the second most common tarsal fracture, bilateral fracture - dislocations of the talus are rare. not many reports regarding the subject can be found ...

conclusions although spinopelvic fracture dislocation injuries are severe high-energy entities, in cases with traumatic spondylolytic spondylolisthesis due to widening of the vertebral canal, neurologic deficit may not be seen at all. case presentation we described a 16-year-old girl with extremely severe axial trauma to the lumbosacral spine who presented with fracture dislocation of the lumbo...

conclusions a neglected hip dislocation with acetabular fracture can be managed satisfactorily with uncemented thr. bone reconstruction using chunk grafts and use of cementless components ensures long-term survival and also preserves adequate bone stock for revision, especially in young patients. introduction posterior hip dislocation of the hip with acetabular fracture is a challenging problem...

we present an exceedingly rare case of left monteggia-galeazzi fracture-dislocation and right monteggiadistal radius fracture occurring simultaneously in a 20-year old male patient who had fallen 13 meters from a building. the combination of monteggia and galeazzi fracture-dislocation in the same forearm is very rare and, to the best of our knowledge, simultaneous bilateral monteggia and galeaz...

INTRODUCTION Periprosthetic fractures and dislocation in the early post-operative period can be disastrous both for the surgeon and the patient. However, undisplaced periprosthetic fractures presenting with dislocation is uncommon. We describe successful management of two cases (one bilateral dislocation and one unilateral dislocation) of undisplaced iatrogenic fractures in total hip arthroplas...

Initial dislocation structure in annealed high-purity Mo single crystals and deformation substructure in a crystal subjected to 1% compression have been examined and studied using transmission electron microscopy (TEM) techniques in order to investigate dislocation multiplication mechanisms in the early stage of plastic deformation. The initial dislocation density is in a range of 10 ∼ 10 cm, a...

The stress-driven motion of dislocations in crystalline solids, and thus the ensuing plastic deformation process, is greatly influenced by the presence or absence of various pointlike defects such as precipitates or solute atoms. These defects act as obstacles for dislocation motion and hence affect the mechanical properties of the material. Here we combine molecular dynamics studies with three...