Structural Fire Modelling. Where is the Frontier Nowadays?

Scientific conference (2002, July 11)

Structural integral monitoring by vibration measurements

in FM2003 - Structural Integrity and Materials Aging (2003)

This paper presents a comparative study on several approaches of structural damage diagnosis based on vibration measurements. Stochastic subspace identification method is used to identify modal parameters ... [more ▼]

This paper presents a comparative study on several approaches of structural damage diagnosis based on vibration measurements. Stochastic subspace identification method is used to identify modal parameters and to generate a Kalman prediction model, which are taken as damage-sensitive features for structural damage detection. A statistical process control technique based on principal component analysis (PCA) is also presented. An improvement and enhancement of PCA are proposed. It is assumed that without damage, structural responses should remain approximately in a hyperplane defined by the principal directions of data. Damage localization is explored with these methods. As only the measured output signals are needed, the methods are convenient for an on-line monitoring. The efficiency and limitation of the proposed methods are illustrated by a practical application. [less ▲]

Structural investigation of reconstituted high density lipoproteins by scanning tunnelling microscopy

in Applied Surface Science (2004), 203

Being able to participate in the reverse cholesterol transport (RCT), high density lipoproteins (HDL) are known to be anti-atherogenic. In order to understand such a process, it is thus essential to have ... [more ▼]

Being able to participate in the reverse cholesterol transport (RCT), high density lipoproteins (HDL) are known to be anti-atherogenic. In order to understand such a process, it is thus essential to have a detailed knowledge of the structure and molecular organisation of HDL. Reconstituted nascent high density lipoproteins (r-HDL), consisting of synthetic phospholipids together with different apolipoproteins (apo A-I, A-IV and E), were thus analysed by scanning tunnelling microscopy (STM). Both shape and dimensions of the discoidal HDL particles measured by this technique were found in good agreement with the data available from the literature. The accuracy of the STM pictures presented in this paper enables for the first time the visualisation of the molecular organisation of such macromolecules. The arrangement of the protein as antiparallel helical segments, is consistent with the general mode of organisation of apolipoprotein/phospholipid discoidal particles previously reported. [less ▲]

Structural investigations of HSS rolls for hot strip mill

in Proceedings of the 41st Rolling Seminar Processes, Rolled and Coated Product (2004)

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills (HSM). Good wear resistance and hardness at high temperatures, are defining features of HSS. Previous experience has ... [more ▼]

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills (HSM). Good wear resistance and hardness at high temperatures, are defining features of HSS. Previous experience has shown that HSS rolls containing mainly hard MC carbides have a high friction coefficient, which is detrimental for the rolling power consumption and for the strip surface quality. On the other hand, HSS rolls containing eutectic rod shaped carbides are brittle and more susceptible to spalling. To overcome these problems, a suitable grade, called HSS7, that gives the best compromise between a low friction coefficient and a high crack propagation and wear resistance was developed. That alloy contains well-dispersed hard VC carbides improving wear, and non-interconnected eutectic carbides of the M2C and M7C3 type, hindering crack propagation. All the metallurgical factors affecting the performance and damage of under rolling condition in front finishing stands are reviewed: wear resistance, friction coefficient, resistance to rolling incident, and oxide film formation. The effect of nature, morphology and amount was for each of the carbides studied and connected to the factor affecting the behaviour of the new grade developed. Different techniques are used such as: differential thermal analysis, optical and electron scanning microscopy and image analysis. A correlation with mechanical properties was also performed. [less ▲]

Structural member behaviour and analysis in case of fire

in Mazzolani, Federico (Ed.) Proceedings of Urban Habitat Constructions under Catastrophic Events (COST Action C26) (2008)

A Structural Model for Early Exit of Older Men in Belgium

in Empirical Economics (2012), 43(1), 379-398

In this paper we propose a structural model of the retirement decision for older workers in Belgium. We model the exit paths available through the various available schemes. Our framework allows ... [more ▼]

In this paper we propose a structural model of the retirement decision for older workers in Belgium. We model the exit paths available through the various available schemes. Our framework allows exploiting all information on possible exit paths and also better identifying preferences and constraints. Results based upon Belgian microsimulation data from 2001 for private sector workers fits rather well observed behavior. Simulations of hypothetical reforms illustrate the potential effects of changing social security rules. [less ▲]

structural model of the mitral valve included in a cardiovascular closed loop model. Static and dynamic validation

Conference (2012, August 31)

Structural objects: formal definitions and constructive requirements in Hilbert, Husserl and Carnap

Conference (2005, November 14)

Structural Optimization Involving Discrete Design Variables

in Eschenauer, Hans; Olhoff, Niels (Eds.) Optimization methods in structural design : proceedings of the Euromech-Colloquium 164, University of Siegen, FR Germany, October 12-14, 1982 (1983)

Structural Optimization of a 220 000 m³ LNG Carrier

in Conference on Computer Applications and Information Technology in the Maritime Industries (COMPIT) (2008, April)

This paper relates to the development of a new concept of 220.000 m³ LNG designed by AKERYARDS France. This work is performed in the framework of FP6 IMPROVE project. The first phase of the activity ... [more ▼]

This paper relates to the development of a new concept of 220.000 m³ LNG designed by AKERYARDS France. This work is performed in the framework of FP6 IMPROVE project. The first phase of the activity related to the identification of stakeholder’s requirements and the definition of key performance indicators. In parallel, several calculations have been performed to test the existing tools and to evaluate the potential gain at the concept design. These activities, associated with the definition of a 220000 m³ QuatarFlex prototype, including the aspects related to the naval architecture and general arrangement, have been re-grouped in the so-called “first design loop”. The second phase concerns the development of new modules to be integrated in the optimization tools in order to satisfy the requirements defined in the first phase. The final phase will be the application of the new (improved) optimization tools for the final LNG product. We highlight that the main target will be the multi-objective structural optimization of the prototype defined by “the first design loop”. However, some feed-back concerning the naval architecture point of view could be expected in this phase. The aim of the paper is to present the results of the first phase, as well as an overview of the analyses carried out during the “first design loop”. Details about the different methodologies proposed for the second phase of the development are given. [less ▲]