Suction Removal of Cohesionless Sediment

Innoxious removal of suction drains.

Suction drains are commonly used in orthopedic elective and trauma surgery; however, drain tube removal causes pain, discomfort, and anxiety. A method of drain tube removal is described in patients who underwent total hip replacement and in adolescents who underwent lower extremity surgery. Ten milliliters of lidocaine was injected through the skin wound around the drain tube. The efficiency of...

Catheter drainage of spontaneous pneumothorax: suction or no suction, early or late removal?

Twenty-three patients with primary spontaneous pneumothorax and 30 patients with secondary spontaneous pneumothorax treated by intercostal catheter drainage with underwater seal were divided randomly into two groups, one receiving suction drainage (up to 20 cm H2O pressure) and the other no suction. The success rate was 57% for the former and 50% for the latter. The suction group spent an avera...

Development of Stresses in Cohesionless

The pressure distribution beneath a conical sandpile, created by pouring sand from a point source onto a rough rigid support, shows a pronounced minimum below the apex (‘the dip’). Recent work of the authors has attempted to explain this phenomenon by invoking local rules for stress propagation that depend on the local geometry, and hence on the construction history, of the medium. We discuss t...

Variability of Sediment Removal in a Semi-Arid Watershed

Rapid sediment removal from the Columbia River plume near field

We compute rates of sediment removal from the Columbia River, USA plume near field using a control volume technique. By using data from repeated transect passes along the plume axis, we account for variations in plume width, depth, and velocity, and we construct a framework for determining the dominant terms in the complete sediment balance. The contribution due to turbulent sediment flux is es...