In this study an approach is proposed to probabilistically evaluate wall thickness and the probability of pipe failure when subjected thinning based on results periodic non-destructive evaluations. Electromagnetic acoustic resonance (EMAR) has been adopted as a specific method thickness. A probabilistic model correlating true evaluated thicknesses was basis laboratory experiments measure 38 art...

In this study the pressure-drop, mean and rms axial velocity data are measured using a differential pressure transducer and a laser Doppler anemometer for the flow of Newtonian and non-Newtonian fluids in a concentric annular pipe (radius ratio =0.5) at various Reynolds numbers encompassing the laminar, transitional and turbulent regimes. Three different fluids are utilized; a semi-rigid shear-...

The linear stability of pipe flow implies that only perturbations of sufficient strength will trigger the transition to turbulence. In order to determine this threshold in perturbation amplitude we study the edge of chaos which separates perturbations that decay towards the laminar profile and perturbations that trigger turbulence. Using the lifetime as an indicator and methods developed in Sku...

in the construction process of a plastic concrete cut-off wall, concreting is usually performed using the termie pipe method. in this method, concreting is performed from the lowest point in the excavated trench (containing the slurry) using a funnel and the pipe connected to it. the concrete poured in the funnel gradually settles in the panel through the termie pipe which is beneath the slurry...

This Note describes calculations of the shielding necessary to reduce the dose rate to less than 0.05 mrem/h when synchrotron radiations emitted by the LCLS electrons beam hit a worst type scattering target located in the hard X-ray line. The calculations were performed using the FLUKA Monte-Carlo code and as well as the STAC8 analytical code. The photon spectrum used as a source term correspon...

Sm-doped BiFeO3 thin films were fabricated on platinized silicon substrates via a sol-gel method. Sm contents and thicknesses were varied in a wide range to investigate their effects on the phase structure and piezoelectricity. X-ray diffraction and Raman spectroscopy experiments revealed a rhombohedral to orthorhombic phase transition and the co-existence of both phases in a certain compositio...

N. Rastkhah, K. Edalati, A. Kermani, M. Seiedi, A. Movafeghi Safety and Radiation Protection Technological Center, Iranian Nuclear Regulatory Authority, Atomic Energy Organization of Iran, Northern Kargar Ave., Tehran, Iran Abstract: This study is a new attempt followed the research project conducted by IAEA in a Contract Research Project (CRP). In this new challenge, the reference blocks desig...

The ultrasensitive differential scanning calorimetry is used to observe the glass transition in thin (1-400 nm) spin-cast films of polystyrene, poly (2-vinyl pyridine) and poly (methyl methacrylate) on a platinum surface. A pronounced glass transition is observed even at a thickness as small as 1-3 nm. Using the high heating (20-200 K/ms) and cooling (1-2 K/ms in glass transition region) rates ...