Research is increasingly focusing on thermal properties of concrete with the aim reducing heat exchange between buildings and environment. On other hand, concretes high conductivity could have interesting applications in field thermo-active ground structures as Geothermal Energy Piles (GEPs). This kind foundations represent an environmentally friendly technology that allows exploiting shallow e...

The application of polyethylene pipes and equipment in the natural gas networks is continuously increasing due to their competitive weight cost compared metallic materials. Electrofusion welding an effective fast approach for production joints with high safety endurance. However, recently intermittent failures have reported underground piping networks. Although failure frequencies are low, but ...

Reducing non-revenue water (NRW) within a distribution network may lead to significant savings. Most existing literature tend focus on the design and implementation aspects of NRW loss through better management leaks, reservoir overflow, theft. In contrast, this paper examines association between various pipe types their respective impact in an emerging country. Malaysia is currently listed und...

Visual inspection by a human operator has been mostly used up till now to detect cracks in sewer pipes. In this paper, we address the problem of automated detection of such cracks. We propose a model which detects crack fractures that may occur in weak areas of a network of pipes. The model also predicts the level of dangerousness of the detected cracks among five crack levels. We evaluate our ...

Gas pipe failure caused by inner corrosion defects is one of the risk factors for the unscheduled shutdown of a plant. The pipes must be inspected to reduce the risk, but this requires a great amount of time and money, since gas pipes are quite long. This research proposes a screening method for the efficient inspection of gas pipes caused by aqueous corrosion. This screening method consists of...

A detailed experimental study of sound propagation in liquids contained by pipes constructed of polymeric materials is discussed. Experiments were conducted with vertically aligned cylinders containing water ensonified at one end by a piston-driven sound source. Significant sound attenuation (as much as 60 dB} was observed in pipes made of flexible polymeric materials, the effect increasing wit...

The problem considered is the Stokes and Navier-Stokes flow through a system of two pipes in the gravity field; inside a vertical pipe there is a free heavy piston. Theoretical analysis, the existence and non-uniqueness of solution, has been completed recently by the authors. Here we present numerical analysis, using finite elements methods, of the stationary state with respect to the angle bet...

background: polyethylene composites including boron can be used as an effective neutron shield. our investigation focuses on manufacturing borated polyethylene nano-composite. the purpose of this study is to design a radiation shield for use in both neutron and gamma fields. materials and methods: borated polyethylene shields containing 2%, and 5% weight percentage of boron nano-particles were ...

The safety of lifelines, as the most important urban facilities, under different conditions highly depends on the safe design and performance of these buried structures. This cannot be achieved unless their actual behaviors are well understood and considered at the designing stage. A new physical model was developed in Amirkabir University of Technology to study the behavior of buried pipes und...