An experiment featuring waterhammer in viscoelastic pipes is presented in which the effects of pipe-wall viscoelasticity on waterhammer pressures are investigated. A large-scale pipeline apparatus made of polyvinyl chloride (PVC) at Deltares, Delft, The Netherlands, has been used to carry out waterhammer experiments. Tests have been conducted in a reservoir-pipeline-valve system consisting of a...

A solar cooking system using vacuum-tube collectors with heat pipes containing a refrigerant as working fluid has been fabricated, and its performance has been analysed experimentally. The experiments were conducted during clear days in July and August of 2002 in Elazı g, Turkey under similar meteorological conditions for three refrigerants and water. Detailed temperature distributions and thei...

according to the irrigation systems design standards, allowed pressure variation in lateral pipes is 20 percent. reasons for this rate selection, which since the 60's is performed, are not known. the increased changes in allowed pressure tubes to lateral pipes design, the increased sprinkling system required pressure and the increased nonuniform sprinkler distribution, so energy supply cos...

The paper describes KURT, an autonomous robot platform prototype that is able to navigate through a network of sewage pipes. KURT is a six-wheeled vehicle; it has modular, layered hardware and control architectures. Its sensor connguration consists mainly of stationary and one exible ultrasound transducers and of two inclinometers. In experiments run in a test sewerage system consisting of conc...

We would like to congratulate Gentile and Siobal on their review article concerning the recent advances in equipment for the treatment of ventilator-associated pneumonia,1 in which they reported different techniques to clear the subglottic secretions that accumulate during intubation. At the time of extubation, they described applying a positive pressure gradient just prior to cuff deflation. T...

We focus on the detection and classification of sewer pipe junctions during the initial survey stage of a 'soft' lnsituform lining process. Estimates are obtained of the diameter and orientation of interconnecting lateral pipes: smaller diameter pipes that join the main sewer from the side. These estimates are compared to a set of likely values of each and the member of this set closest to the ...

Nondestructive evaluation of the gas pipeline system is most commonly performed using magnetic flux leakage (MF L) techniques. A major segment of this network employs seamless pipes. The data obtained from MFL inspection of seamless pipes is contaminated by various sources of noise; including seamless pipe noise due to material properties of the pipe, lift -off varia tion of MFL sensor due to m...

Three zero-order swales, each with a contributing drainage area of about 1 ha, were instrumented to measure pipeflows within the Caspar Creek Experimental Watershed in northwestern California, USA. After two winters of data collection, the second-growth forest on two of the swales was clearcut logged. The third swale remained as an uncut control. After logging, peak pipeflow was about 3.7 times...