background: with respect to physical relations in force and pressure, we hypothesized that the prevalence of traumatic tympanic membrane perforation in patients with a patulous eustachian tube is greater than normal, because in eustachian tube patency, the internal air pressure of the middle ear will not increase after compression, subsequent to trauma. therefore the force upon the tympanic mem...

.hot metal gas forming of tubes can be used in various industries such as automotive and aerospace industries. in this process tube is formed at elevated temperatures, by using gas instead of fluid pressure. lower required pressure and low power are its advantages in comparison to hydroforming process. in this paper, a hot metal gas bulging process of an aluminum alloy tube has been investigate...

a-56-year-old woman underwent carpal tunnel release surgery under general anesthesia. thirty minutes after extubation, the patient complained of chest discomfort with dyspnea. swelling of the neck and upper anterior chest was observed. computed tomography of the chest showed tracheal rupture at the brachiocephalic trunk level, and bronchoscopy demonstrated a 5 cm linear tracheal defect in the p...