High Energy Wide Area Blunt Impact on Composite Aircraft Structures /

The largest source of damage to commercial aircraft is caused by accidental contact with ground service equipment (GSE). The cylindrical bumper typically found on GSE distributes the impact load over a large contact area, possibly spanning multiple internal structural elements (frame bays) of a stiffened-skin fuselage. This type of impact can lead to damage that is widespread and difficult to detect visually. To address this problem, monolithic composite panels of various size and complexity have been modeled and tested quasi-statically and dynamically. The experimental observations have established that detectability is dependent on the impact location and immediately-adjacent internal structure of the panel, as well as the impactor geometry and total deformation of the panel. A methodology to model and predict damage caused by wide area blunt impact events was established, which was then applied to more general cases that were not tested in order to better understand the nature of this type of impact event and how it relates to the final damage state and visual detectabilit

Impact of trauma on children

Millions of children are affected by physical and sexual abuse, natural and technological disasters, transportation accidents, invasive medical procedures, exposure to community violence, violence in the home, assault, and terrorism. Unfortunately, the emotional impact of exposure to trauma on children is often unappreciated and therefore untreated, and yet the impact of exposures to disaster and violence is profound and long-lasting. This article first briefly discusses the epidemiology of trauma in children, and then reviews the psychiatric and neurodevelopmental impact of trauma on children as well as the effects of trauma on children's emotional development. Trauma in children can lead to the development of posttraumatic stress disorder as well as to a variety of other psychiatric disorders, including depression, generalized anxiety disorder, panic attacks, borderline personality disorder, and substance abuse in adult survivors of trauma. Research has found that early exposure to stress and trauma causes physical effects on neurodevelopment which may lead to changes in the individual's long-term response to stress and vulnerability to psychiatric disorders. Exposure to trauma also affects children's ability to regulate, identify, and express emotions, and may have a negative effect on the individual's core identity and ability to relate to others. The authors also discuss what has been learned, based on recent experiences such as the World Trade Center catastrophe, about the role of television viewing in increasing the effects of traumatic events. The last section of the article provides guidance concerning the identification and clinical treatment of children and adolescents who are having emotional problems as a result of exposure to trauma

Hypokalemic paralysis and acid-base balance

Three cases of hypokalemic paralysis are reported, presenting to the Emergency Department. The first is a patient with a hypokalemic periodic paralysis with a normal acid-base status, the second is a case of hypokalemic flaccid paralysis of all extremities with a normal anion gap metabolic acidosis, the last is a patient with a hypokalemic distal paralysis of right upper arm with metabolic alkalosis. Afterwards some pathophysiologic principles and the clinical aspects of hypokalemia are discussed and an appropriate approach to do in Emergency Department, to identify the hypokalemic paralysis etiologies in the Emergency Department, is presented, beginning from the evaluation of acid-base status