In many exposure environments, capillary absorption of water controls the rate of deterioration of concrete. This paper presents a three-dimensional numerical investigation of capillary absorption by treating concrete as a heterogeneous composite discretised into a cubic lattice. The lattice elements were considered as conductive "pipes" with transport properties assigned based on the phase the...

Waters’ variant of the Boneh-Boyen IBE scheme is attractive because of its efficency, applications, and security attributes, but suffers from a relatively complex proof with poor concrete security. This is due in part to the proof’s “artificial abort” step, which has then been inherited by numerous derivative works. It has often been asked whether this step is necessary. We show that it is not,...

Free-reed organ pipes were introduced at the end of the 18 century and soon became popular across Europe, especially in Germany and Switzerland. As opposed to striking-reed pipes (boundor beating-reed pipes) the reed in free-reed pipes does not beat against the shallot, an orifice in the reed, when it is played. Instead it swings freely through a perforated rectangular plate of brass, like in r...

Buried pipes in the modern societies are considered as lifelines with a vital and essential role in the human life cycle. The performance of buried pipes is affected by many factors such as ground surface subsidence. In this paper, the effect of subsidence on pipelines is investigated using a three-dimensional numerical modeling developed in FLAC3D software for four types of most commonly used ...

The nonconstant concrete flow due to the alternating pumping of twin cylinder hydraulic pump will cause vibration trucks. Furthermore, discontinuous caused by inadequate suction and air doping exacerbate vibration. In order study effect on dynamic response vibrational stability whole vehicle, multi-fluid models with concrete-lubrication gas for straight elbow pipes are established, respectively...

In this article various pipes used for transporting of gas are introduced and pros and cons of each one are elucidated. The pipes are categorized in three different subgroups including metallic, polymeric and metallic-wire reinforced polymeric pipes. Metallic-wire reinforced polymeric pipes are nominated as the best option for usage in high pressure pipelines transporting natural gas. As a resu...

The generalized Hough transformmethod is applied to the measurement of the diameters of buried cylindrical pipes by Ground Penetration Radar (GPR). 600 MHz radar scans across long pipes, buried in one metre or so of soil, show complex reflection patterns consisting of a series of inverted hyperbolic arcs. The time of flight t(y) as the radar probe is scanned along an axis, y, perpendicular to t...