Civil Engineering

Investigation of pressurized elbows containing interacting corrosion defects
The effect of single and interacting LTAs (Local Thinned Areas, caused by erosion or corrosion) on the plastic collapse pressure of straight pipes has been studied in many researches. But in case of elbows, only those with single LTAs have been studied yet. This research investigates the effect of interaction of the longitudinally aligned LTAs on the elbow failure pressure. The effects of diffe...


Integrity assessment for saftey relevant nuclear PIPING
The failure behaviour of pipes and piping components (e.g. straight pipe, pipe bend, T-joint) with and without cracks under different loading conditions has been investigated in numerous experimental and analytical/numerical research projects. The results of these projects were used to adjust and to verify different methodologies and procedures to calculate the failure loads, the respective cri...
Residual stress measurements in a P92 steel-In625 superalloy metal weldment in the as-welded and after post weld heat treated conditions
Residual stress measurements have been undertaken in a multi-pass circumferential double J butt-weld made from a P92 martensitic steel pipe using an In625 superalloy weld metal. Stresses were evaluated in the as welded condition and after post weld heat treatment. The deep hole drilling and neutron diffraction techniques were used to provide through thickness measurements for the parent, weld m...


Determination of collapse loads in pipe bends with ovality and variable wall thickness under internal pressure and in-plane opening moment
The combined effect of ovality and variable wall thickness on collapse load of pipe bends under in-plane opening bending moment with internal pressure was investigated using finite element limit analysis considering large geometric change effect. The material was assumed to be elastic–perfectly plastic. The collapse moments were obtained from moment-rotation curves drawn for each bend using t...
A Pipeline Depressurization Model for Fast Decompression and Slow Blowdown
The development and validation of CFD-DECOM, a pipeline depressurization model based on the arbitrary Lagrangian-Eulerian method (ALE) and the homogeneous equilibrium assumption is presented. In CFD-DECOM, the convection terms are separately solved from the other terms in a sub-cycled explicit manner using a sub-timestep that is only a fraction of the main computational timestep. This approach ...


A Novel Approach to Developing a Supervised Spatial Decision Support System for Image Classification: A Study of Paddy Rice Investigation
Paddy rice area estimation via remote sensing techniques has been well established in recent years. Texture information and vegetation indicators are widely used to improve the classification accuracy of satellite images. Accordingly, this study employs texture information and vegetation indicators as ancillary information for classifying paddy rice through remote sensing images. In the first s...
Grain Emergency Vehicle Scheduling Problem with Time and Demand Uncertainty
Grain transportation plays an important role in many relief and emergency supply chains. In this paper, we take the grain emergency vehicle scheduling model between multiwarehouses as the research object. Under the emergency environment, the aim of the problem is to maximize the utilization of vehicles and minimize the delay time. The randomness of the key parameters in grain emergency vehicle ...

Risk Stratification with Extreme Learning Machine: A Retrospective Study on Emergency Department Patients
This paper presents a novel risk stratification method usingextreme learning machine (ELM). ELM was integrated into a scoringsystem to identify the risk of cardiac arrest in emergency department(ED) patients. The experiments were conducted on a cohort of 1025critically ill patients presented to the ED of a tertiary hospital. ELM andvoting based ELM (V-ELM) were evaluated. To enhance the predict...
An Inversely Designed Model for Calculating Pull-In Limit and Position of Electrostatic Fixed-Fixed Beam Actuators
This study presents an inverse approach to obtain a relation between applied voltage and displacement of the midpoint of fixed-fixed beam actuator. The approach has two main sections. The first one is the inverse design of a model to replace real action of upper beam under electrostatic force. The formula obtained from the first section does not comprise the residual stress and gives very small...

Compression of Multispectral Images with Comparatively Few Bands Using Posttransform Tucker Decomposition
Up to now, data compression for the multispectral charge-coupled device (CCD) images with comparatively few bands (MSCFBs) is done independently on each multispectral channel. This compression codec is called a “monospectral compressor.” The monospectral compressor does not have a removing spectral redundancy stage. To fill this gap, we propose an efficient compression approach for MSCFBs. ...
Local Stabilization of Time-Delay Nonlinear Discrete-Time Systems Using Takagi-Sugeno Models and Convex Optimization
A convex condition in terms of linear matrix inequalities (LMIs) is developed for the synthesis of stabilizing fuzzy state feedback controllers for nonlinear discrete-time systems with time-varying delays. A Takagi-Sugeno (T-S) fuzzy model is used to represent exactly the nonlinear system in a restricted domain of the state space, called region of validity. The proposed stabilization condition ...

Structural damage in the cities of Reggiolo and Carpi after the earthquake on May 2012 in Emilia Romagna
This paper addresses the structural damage to the main buildings of the cities of Reggiolo and Carpi after the primary earthquake shocks on May 20th and 29th, 2012, in Emilia Romagna. The damage survey, performed via form-based methods, highlights the different seismic behaviour of several types of buildings, especially those having historical features, and the consequences of the damage in ter...
Efficient Calibration/Uncertainty Analysis Using Paired Complex/Surrogate Models
The use of detailed groundwater models to simulate complex environmental processes can be hampered by (1) long run-times and a penchant for solution convergence problems. Collectively, these can undermine the ability of a modeler to reduce and quantify predictive uncertainty, and therefore limit the use of such detailed models in the decision-making context. We explain and demonstrate a novel a...
Magnitude-phase of the dual-tree quaternionic wavelet transform for multispectral satellite image denoising
In this paper, we study the potential of the quaternionic wavelet transform for the analysis and processing of multispectral images with strong structural information. This new representation gives a very good division of the coefficients in terms of magnitude and three-phase angles and generalizes better the concept of analytic signal to image. Furthermore, it retains the property of shift inv...
Applying telecommunications methodology to road safety for rear-end collision avoidance
This work aims at applying telecommunications methodologies to road safety for preventing rear-end collisions. This contribution can be considered as a pilot study to verify and assess the reliability of a new model and procedure for collision warning system based on low-cost inter-vehicular communications (only a cheap radio transmitter/receiver mounted on each vehicle is needed), where Global...