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See detailInfluence of thermal expansion mismatch on residual stress profile in veneering ceramic layered on zirconia
Mainjot, Amélie ULg; Najjar, Achref; Jakubowicz-Kohen, Boris et al

Poster (2014, October 10)

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See detailInfluence of thermal expansion mismatch on residual stress profile in veneering ceramic layered on zirconia: Measurement by hole-drilling.
Mainjot, Amélie ULg; Najjar, Achref; Jakubowicz-Kohen, Boris D. et al

in Dental materials : official publication of the Academy of Dental Materials (2015), 31(9), 11421149

OBJECTIVES: Mismatch in thermal expansion coefficient between core and veneering ceramic (Deltaalpha=alphacore-alphaveneer, ppm/ degrees C) is reported as a crucial parameter influencing veneer fractures ... [more ▼]

OBJECTIVES: Mismatch in thermal expansion coefficient between core and veneering ceramic (Deltaalpha=alphacore-alphaveneer, ppm/ degrees C) is reported as a crucial parameter influencing veneer fractures with Yttria-tetragonal-zirconia-polycrystal (Y-TZP) prostheses, which still constitutes a misunderstood problem. However, the common positive Deltaalpha concept remains empirical. The objective of this study is to investigate the Deltaalpha dependence of residual stress profiles in veneering ceramic layered on Y-TZP frameworks. METHODS: The stress profile was measured with the hole-drilling method in bilayered disc samples of 20mm diameter with a 0.7mm thick Y-TZP framework and a 1.5mm thick veneer layer. 3 commercial and 4 experimental veneering ceramics (n=3 per group) were used to obtain different Deltaalpha varying from -1.3ppm/ degrees C to +3.2ppm/ degrees C, which were determined by dilatometric analyses. RESULTS: Veneer fractures were observed in samples with Deltaalpha>/=+2.3 or </=-0.3ppm/ degrees C. Residual stress profiles measured in other groups showed compressive stresses in the surface, these stresses decreasing with depth and then becoming more compressive again near the interface. Small Deltaalpha variations were shown to induce significant changes in residual stress profiles. Compressive stress near the framework was found to decrease inversely to Deltaalpha. SIGNIFICANCE: Veneer CTE close to Y-TZP (+0.2ppm/ degrees C Deltaalpha) gived the most favorable stress profile. Yet, near the framework, Deltaalpha-induced residual stress varied inversely to predictions. This could be explained by the hypothesis of structural changes occurrence within the Y-TZP surface. Consequently, the optimum Deltaalpha value cannot be determined before understanding Y-TZP's particular behavior when veneered. [less ▲]

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See detailInfluence of thermal treatment on YBa2Cu3O7-x thick films prepared by electrophoretic deposition on Ni and Ag substrates
Dusoulier, Laurent; Denis, Samuel; Dirickx, Michel et al

in Materials Research Society Symposium Proceedings (2007), 1001E

We have studied the sintering parameters of YBa2Cu3O7-x (YBCO) coatings produced by electrophoretic deposition (EPD) on Ag and Ni substrates. The maximal sintering temperature is ~ 930°C due to partial ... [more ▼]

We have studied the sintering parameters of YBa2Cu3O7-x (YBCO) coatings produced by electrophoretic deposition (EPD) on Ag and Ni substrates. The maximal sintering temperature is ~ 930°C due to partial melting and chemical contamination for Ag and Ni substrates respectively. Increasing the sintering duration does not improve significantly the densification. When Ar sintering atmosphere is used, the coating density is strongly increased on Ag substrates while adhesion is poor on Ni substrates. The Ar-sintered YBCO coating deposited on planar Ag substrate displays a significant magnetic shielding effect for low frequency applied magnetic induction. [less ▲]

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See detailInfluence of thermoelectric coupling on ectopic beats generated by mechano-electric feedback (MEF) in a one-dimensional cardiac fiber model
Collet, Arnaud ULg; Desaive, Thomas ULg; Pierard, Luc ULg et al

in 9th Belgian Day on Biomedical Engineering, Friday November 26th 2010 in the Academy Palace, Hertogstraat 1, 1000 Brussels (2010, November 26)

The influence of thermal processes on electrophysiology has clearly been underlined by Bini et al., using a FitzHugh--Nagumo-type (FHN-type) model. When the temperature is raised, the action potential ... [more ▼]

The influence of thermal processes on electrophysiology has clearly been underlined by Bini et al., using a FitzHugh--Nagumo-type (FHN-type) model. When the temperature is raised, the action potential duration (APD) has been shown to shorten, while the action potential (AP) amplitude decreases, and the conduction velocity increases. In this research, we investigate the effects of thermoelectric coupling on mechano-electric feedback (MEF), and more specifically, on ectopic beats generated by MEF. To investigate these effects, thermoelectric coupling is introduced in a one-dimensional electromechanical model of a cardiac fiber, which considers excitation-contraction coupling (ECC), as well as MEF. [less ▲]

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See detailInfluence of thermoelectric coupling on ectopic beats generated by mechano-electric feedback (MEF) in a one-dimensional cardiac fiber model
Collet, Arnaud ULg; Desaive, Thomas ULg; Pierard, Luc ULg et al

Poster (2010, November 26)

The influence of thermal processes on electrophysiology has clearly been underlined by Bini et al., using a FitzHugh--Nagumo-type (FHN-type) model. When the temperature is raised, the action potential ... [more ▼]

The influence of thermal processes on electrophysiology has clearly been underlined by Bini et al., using a FitzHugh--Nagumo-type (FHN-type) model. When the temperature is raised, the action potential duration (APD) has been shown to shorten, while the action potential (AP) amplitude decreases, and the conduction velocity increases. In this research, we investigate the effects of thermoelectric coupling on mechano-electric feedback (MEF), and more specifically, on ectopic beats generated by MEF. To investigate these effects, thermoelectric coupling is introduced in a one-dimensional electromechanical model of a cardiac fiber, which considers excitation-contraction coupling (ECC), as well as MEF. [less ▲]

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See detailInfluence of thermoelectric coupling on pacemaker activity generated by mechano-electric feedback in a one-dimensional ring-shaped model of cardiac fiber
Collet, Arnaud ULg; Desaive, Thomas ULg; Pierard, Luc ULg et al

Poster (2011, June 01)

The mechano-electric feedback (MEF) in the heart consists in the influence of the tissue deformations on the cardiac electrical activity. Under certain conditions, tissue deformations can generate ... [more ▼]

The mechano-electric feedback (MEF) in the heart consists in the influence of the tissue deformations on the cardiac electrical activity. Under certain conditions, tissue deformations can generate electrical perturbations via stretch-activated channels, such that the membrane potential can exceed the threshold value needed in order to trigger cardiac action potentials (APs). In the present study, we have developed a one-dimensional ring-shaped model of cardiac fiber taking into account three different couplings: the excitation-contraction coupling (ECC), the MEF and the thermoelectric coupling (TEC). The main goal of this work is to examine the effects of the TEC on the different properties of the pacemaker activity generated by the MEF. [less ▲]

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See detailInfluence of thermoelectric coupling on pacemaker activity generated by mechano-electric feedback in a one-dimensional ring-shaped model of cardiac fiber
Collet, Arnaud ULg; Desaive, Thomas ULg; Pierard, Luc ULg et al

in XXIIIrd congress of the International Society of Biomechanics, July 3-7, 2011 (2011, July 05)

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See detailInfluence of thermoelectric coupling on pacemaker activity generated by mechano-electric feedback in a one-dimensional ring-shaped model of cardiac fiber
Collet, Arnaud ULg; Desaive, Thomas ULg; Pierard, Luc ULg et al

Poster (2011, July 05)

Recently, the influence of thermal processes on electrophysiology has clearly been underlined, using a FitzHugh–Nagumo-type (FHN-type) model. When the temperature is raised, the action potential duration ... [more ▼]

Recently, the influence of thermal processes on electrophysiology has clearly been underlined, using a FitzHugh–Nagumo-type (FHN-type) model. When the temperature is raised, the action potential duration (APD) has been shown to shorten, while the action potential (AP) amplitude decreases, and the conduction velocity increases. In the present study, we investigate the effects of thermoelectric coupling on mechano-electric feedback (MEF), and more specifically, on pacemaker activity generated by MEF. To investigate these effects, thermoelectric coupling is introduced in a one-dimensional ring-shaped electromechanical model of cardiac fiber, which takes into account excitation-contraction coupling (ECC), as well as MEF. [less ▲]

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See detailInfluence of time, activities, and memory on the assessment of chronic low back pain intensity.
Marty, Marc; Rozenberg, Sylvie; Legout, Valerie et al

in Spine (2009), 34(15), 1604-9

STUDY DESIGN: A prospective study. OBJECTIVE: To identify factors potentially influencing patient self-evaluation of chronic low back pain (CLBP) and their interactions. SUMMARY OF BACKGROUND DATA: The ... [more ▼]

STUDY DESIGN: A prospective study. OBJECTIVE: To identify factors potentially influencing patient self-evaluation of chronic low back pain (CLBP) and their interactions. SUMMARY OF BACKGROUND DATA: The impact of the time, context, and/or recall on the self-assessment of chronic pain intensity remains poorly understood. METHODS: A prospective study investigated patients' CLBP intensity over 29 days. Patients were evaluated on days 1 and 29 by the investigator with a pain intensity visual analog scale (0-100), and interviewed by phone on days 8, 15, and 22 to 28 to evaluate pain intensity with a numerical rating scale (0-10), either thrice daily (time-associated group), or during rest/activities (activity-associated group). Current and/or recalled pain intensities were also assessed. Means of recorded pain intensity and overall assessment of patient's pain intensity of the day were subjected to statistical analyses with analysis of variance and test of correlation. RESULTS: Among the 203 patients included, 194 (56.2% women; mean age: 47.5 +/- 12.1 year) were considered in the analysis (9 patients were not followed until day 24). Strong correlations were obtained between mean pain intensity (time-associated group = 44 patients) and overall assessment of pain intensity of the day. Strong correlations were also obtained between overall assessment of pain intensity of the day and intensity measured during each activity, but not between current pain intensity and remembered pain 24 of 48 hours earlier (activity-associated group = 150 patients). Recalled pain intensities for the last 7 or 28 days were strongly correlated with current pain intensity, but the correlations were markedly weaker after adjustment for day 29-pain intensity. CONCLUSION: For CLBP patients, overall assessment of pain intensity of the day at evening is accurate to assess pain on 1 day. Overall assessment of pain intensity of the day is very close with usual pain. Furthermore, 24 and 48 hours remembered pain intensity are not accurate measures. Recalls of pain on the 7 or 28 last days were very dependant of the pain intensity of the day of the assessment. These findings could contribute to improving pain intensity assessment in CLBP patients avoiding multiple assessments, especially during clinical trials. [less ▲]

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See detailThe influence of tissular cross-talking on osteoarthritis progression: role of non steroidal antiinflammatory drugs
Pelletier, JP; Reginster, Jean-Yves ULg

in Osteoarthritis and Cartilage (1999), 7

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See detailInfluence of training on ventilatory and cardio-respiratory parameters measured during a standardised exercise in thoroughbred horses
Art, Tatiana ULg; Votion, Dominique ULg; Mc Entee, K et al

in Proceedings of the 11th Comparative Respiratory Society Meeting (1992)

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See detailThe influence of transformational leadership on followers’ affective commitment: The role of perceived organizational support and supervisor’s organizational embodiment
Stinglhamber, Florence; Marique, Géraldine; Caesens, Gaëtane et al

in Career Development International (2015), 20(6), 583-603

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See detailInfluence of treatment mode on host immunity after cure from transplantable tumours : advantage radiotherapy over surgery and chemotherapy
Deneufbourg, Jean-Marie ULg

in Broerse, jj; Barendsen, gw; Kal, hb (Eds.) et al Tumours Biology and Therapy Proceedings of the 7th ICRR (1983, July)

In 2 murine transplantable systems, specific immunity of animals cured of a primary tumour depends on the therapeutic mode. High single doses of radiations confer a significant advantage over surgery as ... [more ▼]

In 2 murine transplantable systems, specific immunity of animals cured of a primary tumour depends on the therapeutic mode. High single doses of radiations confer a significant advantage over surgery as well as over chemotherapy. Pre-operative irradiation boosts anti-tumour immunity to a level similar of  exclusive radiotherapy group. Late recurrences and metastasis might be influenced by taking advantage of the immunological effects of radiotherapy. [less ▲]

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See detailThe Influence of Treatment Position (Prone vs. Supine) on Clip Displacement, Seroma, Tumor Bed and Partial Breast Target Volumes: Comparative Study
Lakosi, Ferenc; GULYBAN, Akos ULg; BEN MUSTAPHA, Selma ULg et al

in Pathology Oncology Research (2016), 22(3), 493-500

To analyse the displacement of surgical clips in prone (Pr) position and assess the consequences on target volumes and integral dose of partial breast irradiation (PBI). 30 post-lumpectomy breast cancer ... [more ▼]

To analyse the displacement of surgical clips in prone (Pr) position and assess the consequences on target volumes and integral dose of partial breast irradiation (PBI). 30 post-lumpectomy breast cancer patients underwent CT imaging in supine (Su) and Pr. Clip displacements were measured by the distances from the clips to a common fix bony reference point. On each dataset, the tumour bed (TB = clips ± seroma), clinical target volume (CTV = TB + 1.5 cm) and planning target volumes (PTV = CTV + 1 cm) for PBI were determined and the volume pairs were compared. Furthermore estimation of integral dose ratio (IDR) within the breast from tangential treatment was performed as the ratio of the irradiated breast volume and the volume encompassing all clips. Clips close to the chest wall (CW) in Su showed significantly less displacement in Pr. The mean volumes of seroma, CTV and PTV were significantly higher in Pr than in Su. The PTV volume difference (Pr-Su) was significantly higher in patients with presence of seroma, deep clips and TB location in the superior-internal-quadrant (SIQ) and at the junction of superior quadrants (jSQ). In a multivariate analysis two factors remained significant: seroma and TB localization in SIQ-jSQ. The IDR was significantly larger in Su than in Pr (7.6 vs. 4.1 p < 0.01). Clip displacements varied considerably with respect to their relative position to the CW. In selected patients Pr position potentially leads to a significant increase in target volumes of PBI. Tangential beam arrangement for PBI should be avoided, not only in Su but in Pr as well in case of clip-based target volume definition. [less ▲]

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See detailInfluence of tree-fall orientation on canopy gap shape in an Ecuadorian rain forest.
Salvador-Van Eysenrode, D; Bogaert, Jan ULg; Van Hecke, P et al

in Journal of Tropical Ecology (1998), 14(6), 865-869

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See detailInfluence of tribology of cage material on ball bearing cage instability
Servais, Christophe ULg; Duquenne, Marc ULg; Bozet, Jean-Luc ULg

in 15th European Space Mechanisms and Tribology Symposium 2013 (2013, September)

By creating a solid lubricant thickness on both bearing races, a cage material of cryogenic ball bearing plays a significant role in the good dynamical behavior of the cage. This role is essential because ... [more ▼]

By creating a solid lubricant thickness on both bearing races, a cage material of cryogenic ball bearing plays a significant role in the good dynamical behavior of the cage. This role is essential because of the lack of conventional lubricant into this kind of bearing. In this paper, a method able to identify if a particular potential cage material can correctly fulfill its function is described. In other words, if it can lead to a stable movement of the cage. From the identification of fundamental tribological parameters governing the cage behavior, this method presents an example of ranking of such materials. This is based on pin-on-disk tests and on a numerical approach. [less ▲]

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