Engineering

Estimation of fixed effects panel regression models with separable and nonseparable space–time filters
This paper considers a quasi-maximum likelihood estimation for a linear panel data model with time and individual fixed effects, where the disturbances have dynamic and spatial correlations which might be spatially stable or unstable. We first consider both separable and nonseparable space–time filters for the stable model. The separable space–time filter is subject to a parametric restrict...


Experimental Evaluation and Optimization of Flank Wear During Turning of AISI 4340 Steel with Coated Carbide Inserts Using Different Cutting Fluids
The understanding of cutting fluids performance in turning process is very important in order to improve the efficiency of the process. This efficiency can be determined based on certain process parameters such as flank wear, cutting forces developed, temperature developed at the tool chip interface, surface roughness on the work piece, etc. In this study, the objective is to determine the infl...
First and second thermodynamic law analyses applied to spark ignition engines modelling and emissions prediction
A mathematical and numerical model of flow and combustion process for spark ignition engines is developed using the principles of the first and second law of thermodynamic. Availability (exergy) analysis is applied to cylinder of a spark ignition engine during the combustion process using a two-zone combustion model. Special attention is given to identification and quantification of irreversibi...


Geodesic-based manifold learning for parameterization of triangular meshes
Reverse Engineering (RE) requires representing with free forms (NURBS, Spline, Bézier) a real surface (S_0) which has been point-sampled. To serve this purpose, we have implemented an algorithm that minimizes the accumulated distance between the free form and the (noisy) point sample. We use a dual-distance calculation point to / from surfaces, which discourages the forming of outliers and art...
TRIZ theory and case based reasoning: synergies and oppositions
A few years after TRIZ appearance in highly industrialized countries, many experts in Case Based Reasoning pointed out potential similarities between both approaches. Later on, research activities have been conducted and publications appeared on this subject. This paper presents the results of an in depth study of the roots of both approaches, from the point of view of their philosophy and the ...


Ensuring correct product characteristics during the design process
For many companies, the design process and product design are treated as two separate domains. However, the design process needs to be controlled in such a way that desired product characteristics are attained. This paper proposes a decision support system (DSS) where management techniques develop linkages between process and product, and where the system identifies possible conflicts between p...
In Vivo Photoacoustic and Fluorescence Cystography Using Clinically Relevant Dual Modal Indocyanine Green
Conventional X-ray-based cystography uses radio-opaque materials, but this method uses harmful ionizing radiation and is not sensitive. In this study, we demonstrate nonionizing and noninvasive photoacoustic (PA) and fluorescence (FL) cystography using clinically relevant indocyanine green (ICG) in vivo. After transurethral injection of ICG into rats through a catheter, their bladders were phot...

Visual Analysis Using Biplot Techniques of Rainfall Changes over Turkey
The variability in the averages of the monthly rainfall in Turkey’s seven different climate regions was examined using a principal component analysis (PCA) biplot and a canonical variate analysis (CVA) biplot to analyse meteorological data from 81 stations in the country over a period of January 1970–December 2010. Using biplots as visuals for analysing meteorological data is extremely help...
A Novel Numerical Approach for Solving Weight Function of Electromagnetic Flow Meter
A novel finite element procedure for the solution of the electromagnetic flow meter weight function is presented. The weight function represents the relative contribution of the location at flow cross section to the output signal of the flow meter. This paper treats the problem as the intuitive the approach, in which the distribution of the virtual current density is considered as the substitut...

Numerical analysis of the axial strength of CHS T-joints reinforced with external stiffeners
This study reinforced circular hollow section (CHS) T-joints with external stiffeners and analyzed the axial strength of both the unreinforced and reinforced T-joints. The SHELL181 element in ANSYS was used to establish FE models of the T-joints. A comparison between the experimental results indicated that the numerical method could be used to compute the strength for the unreinforced and reinf...
New generation of energy dissipating systems based on biaxial buckling
This work proposes a new generation of energy dissipating system based upon an original patented mechanical assembly: the Absorption par Compression–Torsion Plastique (ACTP) presented in Abdul-Latif and Baleh (2005). 1 Patent no. WO 2005090822. In fact, the ACTP transforms a uniaxial external loading into biaxial compression–torsion, where several degrees of biaxial loading paths complexi...

Practical method for calculating the buckling temperature of the web-post in a cellular steel beam in fire
Buckling behaviors of web-posts in a cellular steel beam at elevated temperatures in a fire were studied using the Finite Element Method (FEM) analysis and available analytical models. The buckling temperatures obtained by the analytical models differed greatly to those obtained from the FEM simulation. Among these analytical models, the buckling temperature obtained through the strut model bas...
An analytical method for the buckling analysis of cylindrical shells with non-axisymmetric thickness variations under external pressure
This article presents an analytical method for the buckling analysis of laterally pressured cylindrical shells with non-axisymmetric thickness variations. The previous results for thickness variations under external pressure are reviewed firstly. Then, a general analytical method that combines the perturbation method and Fourier series expansion is developed to derive buckling load formulas, wh...
Local–global mode interaction in stringer-stiffened plates
A recently developed nonlinear analytical model for axially loaded thin-walled stringer-stiffened plates based on variational principles is extended to include local buckling of the main plate. Interaction between the weakly stable global buckling mode and the strongly stable local buckling mode is highlighted. Highly unstable post-buckling behaviour and a progressively changing wavelength in t...
A new method for the structural design of flexible liners for gravity pipes of egg-shaped cross section: Theoretical considerations and formulation of the problem
The majority of gravity pipes with a non-circular cross section have an egg-shaped profile and an inner surface that can be geometrically delineated by three interconnecting circles on each side of a vertical axis of symmetry. Renovation of these pipes can be undertaken at low cost and with minimal surface disruption by installation of a close-fitting polymeric liner, most commonly by the ‘cu...