On the relation between bond quality and impact-echo frequency spectrum

in Restoration of Buildings and Monuments = Bauinstandsetzen und Baudenkmalpflege (2010), 16(4/5), 303-314

According to EN 1504-10 and ACI Concrete Repair Manual, bond strength and interface quality are the main features of repair system necessary to be assessed. Pull-off test is most commonly used for bond ... [more ▼]

According to EN 1504-10 and ACI Concrete Repair Manual, bond strength and interface quality are the main features of repair system necessary to be assessed. Pull-off test is most commonly used for bond strength evaluation but growing interest in nondestructive techniques (NDT) is recently noted. Impact-echo (IE) is treated as the most promising one for this purpose. The aim of this paper is to analyze an effect of bond quality on stress wave propagation in repair systems. A group of samples has been prepared in order to obtain repair systems of different bond quality. Prior to repair, quality of concrete substrates has been characterized according different techniques: compressive strength, superficial cohesion, surface roughness index and cracking quantification. Than a polymer-modified repair mortar has been applied. After hardening, IE signals have been recorded and pull-off bond strength determined. The relationships between parameters characterizing surface quality, bond strength, IE frequency spectrum and results of wavelet analysis of IE signal have been analyzed. [less ▲]

Linear stability analysis of an evaporating binary liquid layer with fully transient reference profiles

in Bulletin of the American Physical Society, Vol. 55, n°16 (2010)

Microtomographic investigation of a yeast grain porous structure

in Journal of Food Engineering (2010), 97

Assimilation of high-frequency radar surface currents measurements to optimize tidal boundary conditions and wind forcing

Conference (2010)

An ensemble smoother scheme is presented to assimilate high-frequency (HF) radar surface currents to improve tidal boundary conditions and wind forcings of a circulation model of the German Bight. To ... [more ▼]

An ensemble smoother scheme is presented to assimilate high-frequency (HF) radar surface currents to improve tidal boundary conditions and wind forcings of a circulation model of the German Bight. To create an ensemble of dynamically realistic tidal boundary conditions, a cost function is formulated which is directly related to the probability of each perturbation. This cost function ensures that the perturbations are spatially smooth and that the structure of the perturbations satisfies approximately the harmonic linearized shallow water equations. Based on those perturbations an ensemble simulation is carried out using the full three-dimensional General Estuarine Ocean Model (GETM). Optimized boundary values are obtained using all observations within the assimilation period using the covariances of the ensemble simulation. The approach acts like a smoother scheme since past and future observations are taken into account. The final analysis is obtained by rerunning the model using the optimal perturbation of the boundary conditions. The analyzed model solution satisfies thus the model equations exactly and does not suffer from spurious adjustments often observed with sequential assimilation schemes. Model results are also compared to independent tide gage data. The assimilation also reduces the model error compared to those sea level observations. The same scheme is also used to correct surface winds. Surface winds are crucial for accurately modeling the marine circulation in coastal waters. The method is validated directly by comparing the analyzed wind speed to in situ measurements and indirectly by assessing the impact of the corrected winds on sea surface temperature (SST) relative to satellite SST. [less ▲]

Amélioration et renforcement des bétons

Learning material (2010)

Les droits de la défense dans la procédure arbitrale

in Revue Critique de Jurisprudence Belge [= RCJB] (2010), 3

Pratique archéologique, esthétique picturale et temporalité historique chez Foucault

in Sens Public (2010)

Analysis of key texts of Michel Foucault devoted to the pictorial aesthetic during the sixties only makes sense if it is properly reported to the epistemological issues raised by archeology, i.e. the ... [more ▼]

Analysis of key texts of Michel Foucault devoted to the pictorial aesthetic during the sixties only makes sense if it is properly reported to the epistemological issues raised by archeology, i.e. the methodical description of speeches he was developing at the same time. The use of painting as an archive, on the first hand, and the outline of an archeology of painting, on the other hand, can highlight a tension between teachings of archeology of speeches and reflections inspired by painting. The symptom of this tension consists in the different meanings – archeological or pictural – of the notion of representation. This essential discontinuity between visibilities and discourses concerns the most basic premise of Foucaldian history of thought : instead of positing the continuity of one historical time, history of thought calls for a description of a crumbled temporality of history and for a complex interweaving of « various historicities ». The confrontation of Foucault’s archeology to his thought on painting thus shows one of the ways by which he finally came to propose an original philosophy of historical time. We would then hold the necessary preliminary to a possible reconstruction of the book, unfortunately lost, that Foucault devoted to the work of Manet, Le noir et la couleur. [less ▲]

De novo lipogenesis protects cancer cells from free radicals and chemotherapeutics by promoting membrane lipid saturation.

in Cancer Research (2010), 70(20), 8117-26

Activation of de novo lipogenesis in cancer cells is increasingly recognized as a hallmark of aggressive cancers and has been implicated in the production of membranes for rapid cell proliferation. In the ... [more ▼]

Activation of de novo lipogenesis in cancer cells is increasingly recognized as a hallmark of aggressive cancers and has been implicated in the production of membranes for rapid cell proliferation. In the current report, we provide evidence that this activation has a more profound role. Using a mass spectrometry-based phospholipid analysis approach, we show that clinical tumor tissues that display the lipogenic phenotype show an increase in the degree of lipid saturation compared with nonlipogenic tumors. Reversal of the lipogenic switch in cancer cells by treatment with the lipogenesis inhibitor soraphen A or by targeting lipogenic enzymes with small interfering RNA leads to a marked decrease in saturated and mono-unsaturated phospholipid species and increases the relative degree of polyunsaturation. Because polyunsaturated acyl chains are more susceptible to peroxidation, inhibition of lipogenesis increases the levels of peroxidation end products and renders cells more susceptible to oxidative stress-induced cell death. As saturated lipids pack more densely, modulation of lipogenesis also alters lateral and transversal membrane dynamics as revealed by diffusion of membrane-targeted green fluorescent protein and by the uptake and response to doxorubicin. These data show that shifting lipid acquisition from lipid uptake toward de novo lipogenesis dramatically changes membrane properties and protects cells from both endogenous and exogenous insults. These findings provide important new insights into the role of de novo lipogenesis in cancer cells, and they provide a rationale for the use of lipogenesis inhibitors as antineoplastic agents and as chemotherapeutic sensitizers. [less ▲]

Droit des personnes et des familles

Book published by Larcier - 2ème édition (2010)

Stéréotypes prescriptifs et avantages des groupes dominants

in Année Psychologique (L') (2010), 110

The prescriptive component of stereotypes is defined as a set of beliefs about the characteristics group members should possess. It has mainly been studied regarding gender stereotypes. We believe that ... [more ▼]

The prescriptive component of stereotypes is defined as a set of beliefs about the characteristics group members should possess. It has mainly been studied regarding gender stereotypes. We believe that the main function of this prescriptive component is to allow dominant group members to maintain subordinate group members in an advantageous position for themselves. To illustrate our proposal, we present several theoretical and empirical papers, showing that the relative status of social groups is a determinant of which characteristics are prescribed to the members of these groups; that subordinates who fail to conform to the prescription are sanctioned; and that dominants prescribe to subordinates characteristics they see as beneficial to their own group. [less ▲]