Vortex-induced vibrations and solid-structure impacts of a horizontal flexible pipeline in the vicinity bottom wall boundary are experimentally investigated water flume. A neutrally-buoyant submerged pipe, with length-to-diameter ratio about 87 fixed end supports, is subject to shear flow an oblique angle 30°. The initial gap-to-diameter between pipe equal 0.2. non-intrusive measurement high-sp...

This paper presents a feed forward back-propagation neural network model to estimate the vertical deformation of high-density polyethylene (HDPE) small diameter flexible pipes buried in reinforced trenches and settlement of soil surface (SSS) subjected to repeated loadings to simulate the heavy vehicle loads. The experimental data show that the vertical diametral strain (VDS) of pipe embedded i...

Spatially regulated transcription of the pipe gene in ventral cells of the Drosophila ovary follicle cell epithelium is a key event that specifies progeny embryo dorsal-ventral (DV) polarity. pipe encodes ten putative protein isoforms, all of which exhibit similarity to vertebrate glycosaminoglycan-modifying enzymes. Expression of one of the isoforms, Pipe-ST2, in follicle cells has previously ...

This paper presents a novel segmentation technique for flexible pipes in deep underwater environments. It consists in finding regions of the pipe denominated vertebrae and has three stages. Firstly, the input image is pre-processed to reduce noise. Secondly, the pre-processed image is binarized by the proposed Multi-level Topological Binarization technique, resulting in an image which highlight...

In our previous studies, Genetic Programming (GP), Probabilistic Incremental Program Evolution (PIPE) and Ant Programming (AP) have been used to optimal design of Flexible Neural Tree (FNT). In this paper Grammar Guided Genetic Programming (GGGP) was employed to optimize the architecture of FNT model. Based on the predefined instruction sets, a flexible neural tree model can be created and evol...

In order to reduce the temperature in marine engine cabin, improve working environment of staff and meet economy emission requirements, cooling system was experimentally investigated present study. this regard, water air-cooling schemes were studied main indicators including torque, smoke-emission, exhaust analyzed. The obtained results indicate that highest torque can be from turbine case pipe...

An endoscopy is a tool that used to examine the interior of hollow organ or cavity body by inserting directly into organ. However, intestinal not friendly patients due discomfort, and it can easily cause damage even perforation use rigid materials endoscopy. Here, we provide an earthworm-based soft robot equipped with gripper for application on exams surgery. The composed frontal radial actuato...

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...