The interaction between ocean environment and pile structure is so complex that despite considerable laboratory as well as prototype studies estimation of scour depth and its geometry in a generalized and accurate form are still difficult to make. One of the reasons underlying this uncertainty could be the limitation of the statistical curve fitting technique, commonly employed to analyse the c...

The field evaluation of pile-soil combination is a key step in the service life pile foundation. However, due to time-varying nature interaction, there no efficient method accurately analyze it. This paper introduces health monitoring technique for assessing state bond. transient vibration coupling was measured by piezoelectric ceramic sensor. In experiment, different bond states and soil were ...

A semi-quantitative real-time RT-PCR assay was designed to measure gonococcal pilin antigenic variation (SQ-PCR Av assay). This assay employs 17 hybridization probe sets that quantitate subpopulations of pilin transcripts carrying different silent pilin copy sequences and one set that detects total pilE transcript levels. Mixtures of a DNA standard carrying the silent copy being detected and a ...

Abstract Until recently, the behavior of connected piled raft foundation was not fully understood in seismically active region due to complex dynamic soil–pile–foundation structure interaction. This concern arises when soil deposit-supported foundations are stratified or heterogynous and subjected high ground motion intensity. In current study, a series numerical analyses using ABAQUS software ...

PilA is the putative DNA-binding component of a two-component system that regulates transcription of the pilin expression locus (pilE) of Neisseria gonorrhoeae. Here we report the purification of the PilA protein and characterization of its DNA-binding activity. PilA was overproduced in Escherichia coli with an isopropyl-beta-D-thiogalactopyranoside (IPTG)-inducible expression vector. Cell extr...

Received: June 12, 2017 Revised: October 24, 2017 Accepted: November 03, 2017 Abstract: Background and Objective: Prestressed high strength concrete pipe pile (PHC) shows brittle fracture when subjected to more than its own bearing capacity. Therefore, the non-prestressed steel bar is added to the PHC pipe pile, that is, the mixed reinforced pipe pile (PRC). The mechanical behavior of PRC group...

abstract: The behavior of continuous flight auger (CFA) piles and steel H-section to lateral loading is investigated using numerical analyses supported by field tests. A three-dimensional finite element model load presented. was validated with the results twelve tests performed on CFA installed in two deposits sandy soils. approach proposed this study good agreement response observed tests, thu...

It is seen from recent earthquakes that in case of fixed-base foundation system, damped systems have proved to be longing the lifespan structure by lengthening lateral fundamental period leads higher damping comparison assumptions a system. In this study, better understand phenomenon involved soil-pile interaction finite element simulation model developed Abaqus FEA software. The numerical made...

We investigate the collapse of granular rodpiles as a function of particle (length/diameter) and pile (height/radius) aspect ratio. We find that, for all particle aspect ratios below 24, there exists a critical height Hl below which the pile never collapses, maintaining its initial shape as a solid, and a second height Hu above which the pile always collapses. Intermediate heights between Hl an...

Many coastal and offshore construction activities require the driving of piles into the seabed, either using impact or vibratory pile drivers. Impact pile driving produces an intense impulsive underwater noise that has been associated with fish deaths at very short range, whereas vibratory pile driving produces a lower level continuous noise. Because of the high sound levels involved, noise fro...