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See detailThe impact of ageing on episodic memory encoding: an fMRI study
François, Sarah ULg; Angel, Lucie; Salmon, Eric ULg et al

Poster (2015, May 21)

It is now commonly accepted that a decline in episodic memory is observed with ageing: while recollection processes are impaired, familiarity seems to be relatively preserved (a). Older individuals appear ... [more ▼]

It is now commonly accepted that a decline in episodic memory is observed with ageing: while recollection processes are impaired, familiarity seems to be relatively preserved (a). Older individuals appear to recruit prefrontal areas bilaterally when their encoding is successful, while in young adults this activation is found to be left-lateralized (b). In this study, we were interested in the differences between younger and older participant regarding cerebral activity during encoding depending on whether the item elicited recollection or familiarity during the recognition phase. Twenty young volunteers (aged 19 to 29 years old) and 19 older volunteers (aged 60 to 78 years old) were presented visual stimuli depicting objects. During a first fMRI session, they were asked to make a size judgement about them. Then, in a second phase, the subjects were shown the items previously encountered during the encoding phase, as well as distractors. Participants' task was to determine which one were new and which one were seen earlier. For the latter, they also performed a Remember-Know judgement. Data were analysed using SPM8, with an event design comparing modifications in cerebral activity between the two subjects groups during encoding (1) for the items leading to recollection during the recognition phase compared to those leading to familiarity, and (2) for the items associated with familiarity during the recognition phase compared to those which were not recognized. Results show that older adults display a heightened activity in the right middle frontal gyrus, medial cingulate and paracingulate left gyri as well as in the precuneus, bilaterally when they engage recollection processes. Amongst those regions, the precuneus seems to underlie compensatory processes, allowing the elderly to perform a richer encoding, as it was previously suggested for recollection processes during recall (c). However, no increase in activity was associated with familiarity processes in older adults, possibly because they are less demanding regarding attentional resources. (a) Bugaiska, A., Clarys, D., Jarry, C., Taconnat, L., Tapia, G., Vanneste, S., & Isingrini, M. (2007). The effect of aging in recollective experience: the processing speed and executive functioning hypothesis. Consciousness and Cognition, 16(4), 797-808. doi: 10.1016/j.concog.2006.11.007 (b) Duverne, S., Motamedinia, S., & Rugg, M. D. (2009). The relationship between aging, performance, and the neural correlates of successful memory encoding. Cerebral Cortex, 19(3), 733-744. doi:10.1093/cercor/bhn122 (c) Angel, L., Bastin, C., Genon, S., Balteau, E., Phillips, C., Luxen, A., . . . Collette, F. (2013). Differential effects of aging on the neural correlates of recollection and familiarity. Cortex, 49(6), 1585-1597. doi:10.1016/j.cortex.2012.10.002 [less ▲]

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See detailThe impact of ageing on episodic memory encoding: an fMRI study
François, Sarah ULg; Angel, Lucie; Salmon, Eric ULg et al

Poster (2015, May 28)

It is now commonly accepted that a decline in episodic memory is observed with ageing: while recollection processes are impaired, familiarity seems to be relatively preserved (a). Older individuals appear ... [more ▼]

It is now commonly accepted that a decline in episodic memory is observed with ageing: while recollection processes are impaired, familiarity seems to be relatively preserved (a). Older individuals appear to recruit prefrontal areas bilaterally when their encoding is successful, while in young adults this activation is found to be left-lateralized (b). In this study, we were interested in the differences between younger and older participant regarding cerebral activity during encoding depending on whether the item elicited recollection or familiarity during the recognition phase. Twenty young volunteers (aged 19 to 29 years old) and 19 older volunteers (aged 60 to 78 years old) were presented visual stimuli depicting objects. During a first fMRI session, they were asked to make a size judgement about them. Then, in a second phase, the subjects were shown the items previously encountered during the encoding phase, as well as distractors. Participants' task was to determine which one were new and which one were seen earlier. For the latter, they also performed a Remember-Know judgement. Data were analysed using SPM8, with an event design comparing modifications in cerebral activity between the two subjects groups during encoding (1) for the items leading to recollection during the recognition phase compared to those leading to familiarity, and (2) for the items associated with familiarity during the recognition phase compared to those which were not recognized. Results show that older adults display a heightened activity in the right middle frontal gyrus, medial cingulate and paracingulate left gyri as well as in the precuneus, bilaterally when they engage recollection processes. Given that activations in these areas did not correlate with performance, they could be interepreted either as dedifferentiation or as an attempt of the ageing brain to compensate for a less elaborate encoding. However, no increase of activity was associated with familiarity processes in older adults, possibly because they are less demanding regarding attentional resources. (a) Bugaiska, A., Clarys, D., Jarry, C., Taconnat, L., Tapia, G., Vanneste, S., & Isingrini, M. (2007). The effect of aging in recollective experience: the processing speed and executive functioning hypothesis. Consciousness and Cognition, 16(4), 797-808. doi: 10.1016/j.concog.2006.11.007 (b) Duverne, S., Motamedinia, S., & Rugg, M. D. (2009). The relationship between aging, performance, and the neural correlates of successful memory encoding. Cerebral Cortex, 19(3), 733-744. doi:10.1093/cercor/bhn122 [less ▲]

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See detailThe impact of aging and hearing status on verbal short-term memory
Verhaegen, Clémence ULg; Collette, Fabienne ULg; Majerus, Steve ULg

in Aging, Neuropsychology and Cognition (2013)

The aim of this study is to assess the impact of hearing status on age-related decrease in verbal short-term memory (STM) performance. This was done by administering a battery of verbal STM tasks to ... [more ▼]

The aim of this study is to assess the impact of hearing status on age-related decrease in verbal short-term memory (STM) performance. This was done by administering a battery of verbal STM tasks to elderly and young adult participants matched for hearing thresholds, as well as to young normal-hearing control participants. The matching procedure allowed us to assess the importance of hearing loss as an explanatory factor of age-related STM decline. We observed that elderly participants and hearing-matched young participants showed equal levels of performance in all verbal STM tasks, and performed overall lower than the normal hearing young control participants. This study provides evidence for recent theoretical accounts considering reduced hearing level as an important explanatory factor of poor auditory-verbal STM performance in older adults. [less ▲]

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See detailThe impact of aging and hearing status on verbal short-term memory
Verhaegen, Clémence ULg; Collette, Fabienne ULg; Majerus, Steve ULg

Conference (2012, May)

We determined the impact of hearing status on age-related effects on verbal short-term memory (STM). Rabbit (1991) observed that elderly participants with hearing loss show impaired STM; he suggested that ... [more ▼]

We determined the impact of hearing status on age-related effects on verbal short-term memory (STM). Rabbit (1991) observed that elderly participants with hearing loss show impaired STM; he suggested that in the case of hearing loss, attentional resources had to be recruited to a larger extent to stimulus perception, reducing the available pool of attentional resources for STM processing. We tested this hypothesis by distinguishing the impact of aging from the impact of hearing status on STM. This was done by administering different verbal STM tasks to elderly and young adult participants matched for hearing threshold, as well as normal-hearing control participants. We observed that elderly participants and hearing-matched young participants showed equal levels of performance in all verbal STM tasks, and performed overall more poorly than the normal-hearing young control participants. These results suggest that mild hearing impairment is a major explanatory factor of reduced STM performance, and importantly, is age-independent. The results are discussed within an interactive framework of STM and attentional processing (Majerus et al., 2009). [less ▲]

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See detailThe impact of aging and hearing status on verbal working memory
Verhaegen, Clémence ULg; Collette, Fabienne ULg; Majerus, Steve ULg

in Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition (2014), 21(4), 464-482

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See detailThe impact of aging on associative memory for pre-existing unitized associations
Delhaye, Emma ULg; Bastin, Christine ULg

in Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition (2016)

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See detailImpact of aging technique and muscle on oxidative stability of beef packaged under high-oxygen atmosphere
Didimo Imazaki, Pedro Henrique ULg; Tahiri, Assia ULg; Thimister, Jacqueline ULg et al

Poster (2014, October 17)

Two common approaches for beef aging are wet-aging and carcass-aging. Wet-aging refers to meat aged in a sealed vacuum package at refrigerated temperatures, while carcass aged at controlled temperatures ... [more ▼]

Two common approaches for beef aging are wet-aging and carcass-aging. Wet-aging refers to meat aged in a sealed vacuum package at refrigerated temperatures, while carcass aged at controlled temperatures and humidity is defined as carcass-aging. Carcass-aging is an ancient process used nowadays to produce beef characterized by its superior quality. The meat conservability is influenced by its sensitivity to oxidative process which can vary from one muscle to another. The aim of this study was to compare the effect of aging technique (wet-aging vs. carcass-aging), muscle (longissimus dorsi vs. rectus femoris) and previous vacuum storage time on colour and lipid stability of beef packaged in high-oxygen atmosphere. After a seven-day wet- or carcass-aging step, longissimus dorsi and rectus femoris muscle cuts from 4 Belgian Blue cows were vacuum packaged and stored at −1 °C for up to 28 days. At different times, part of these samples was repackaged under modified atmosphere – 70 % O2:30 % CO2 –, and stored during 7 days at +4 °C in order to simulate retail conditions. The following parameters were evaluated: colour (CIE L*a*b*), metmyoglobin %, lipid oxidation (TBARS), antioxidant enzyme activities (catalase, glutathione peroxidase and superoxide dismutase), alpha-tocopherol and fat content. The sensitivity of high-oxygen atmosphere repacked meat cuts to oxidation was influenced by the aging technique (wet > carcass conditions), muscle (rectus femoris > longissimus dorsi) and length of the vacuum storage. Oxidation stability could be associated with muscle catalase activity, and no association could be established with the alpha-tocopherol content. [less ▲]

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See detailImpact of aging technique, muscle and previous vacuum storage time on oxidative stability of beef packaged under high-oxygen atmosphere
Didimo Imazaki, Pedro Henrique ULg; Douny, Caroline ULg; Scippo, Marie-Louise ULg et al

Conference (2014, December 11)

The aim of this study was to compare the effect of aging technique (wet-aging vs. carcass-aging), muscle (longissimus dorsi vs. rectus femoris) and previous vacuum storage time on color and lipid ... [more ▼]

The aim of this study was to compare the effect of aging technique (wet-aging vs. carcass-aging), muscle (longissimus dorsi vs. rectus femoris) and previous vacuum storage time on color and lipid stability of beef packaged in high-oxygen atmosphere. After a seven-day wet- or carcass-aging step, longissimus dorsi and rectus femoris muscle cuts from 4 Belgian Blue cows were vacuum packaged and stored at −1 °C for up to 28 days. At different times, part of these samples was repackaged under modified atmosphere – 70 % O2:30 % CO2 –, and stored during 7 days at +4 °C. The following parameters were evaluated at different intervals: color (CIE L*a*b*), metmyoglobin %, lipid oxidation (TBARS), antioxidant enzyme activities (catalase, glutathione peroxidase and superoxide dismutase), alpha-tocopherol and fat content. The sensitivity of modified atmosphere repacked meat cuts to oxidation was influenced by the conditions of the previous aging period (wet > carcass conditions), muscle (rectus femoris > longissimus dorsi) and length of the vacuum storage. Oxidation stability could be associated with catalase activity, and no association could be established with the alpha-tocopherol content. [less ▲]

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See detailImpact of agricultural practices on soil microbial communities in Belgium
Degrune, Florine ULg; Taminiau, Bernard ULg; Dufrêne, Marc ULg et al

Poster (2013, December 11)

The use of fertilizers in agricultural soils is becoming a real environmental issue (an obvious example is eutrophication caused by leaching of phosphorus and nitrates). Much research has focused on ... [more ▼]

The use of fertilizers in agricultural soils is becoming a real environmental issue (an obvious example is eutrophication caused by leaching of phosphorus and nitrates). Much research has focused on finding ways to reduce the use of chemicals, and investigating microbial life may lead to solutions. We know that bacteria and fungi are deeply involved in nutrient cycles. Recently the emergence of massive parallel sequencing has enabled us to realize that microbial diversity is huger than we expected. With such a tool it should be possible to study how soil management practices affect the microbial diversity of agricultural soils. A few such studies have been conducted, most of them focusing on bacteria. For Belgium in particular, there is a lack of data on this topic. Here the aim was to see how residue management and tillage practices affect communities of both bacteria and fungi in Belgian agricultural soils. For this we used 454 pyrosequencing of 16S bacterial and 28S fungal rRNA genes. Soil samples came from an experiment in which faba beans were grown with four soil management practices (tillage and no tillage, with and without crop residues), each repeated four times in a Latin square. Several chemical and physical characteristics were measured on each sample. The results show that fungi and bacteria are both impacted by Tillage practices. The main soil drivers are Magnesium and Phosphorus for Fungi communities, and Phosphorus and Potassium for bacteria communities. Finally, the fungi variance observed between plots is explained at 38% by Tillage, Magnesium and phosphorus. And the bacteria variance is explained at 28% by Tillage, Phosphorus and Potassium. [less ▲]

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See detailImpact of alemtuzumab versus anti-thymocyte globulin after unrelated allogeneic stem cell transplantation with reduced-intensity conditioning as treatment for AML in CR1: a survey from the Acute Leukaemia Working Party of the EBMT
Baron, Frédéric ULg; Labopin, M.; Mufti, G. et al

Conference (2012)

In vivo T cell depletion of the graft with anti-thymocyte globulin (ATG) or with alemtuzumab has been frequently used in the setting of RIC allo-SCT from unrelated donors. This survey compared allo-SCT ... [more ▼]

In vivo T cell depletion of the graft with anti-thymocyte globulin (ATG) or with alemtuzumab has been frequently used in the setting of RIC allo-SCT from unrelated donors. This survey compared allo-SCT outcomes between 364 AML patients in first CR given unrelated PBSC after chemotherapy-based RIC and given either ATG (n=213) or alemtuzumab (n=151) in the conditioning regimen. Alemtuzumab patients were more frequently given grafts from HLA-mismatched donors (30% versus 16% having at least 1/10 HLA-mismatch with their donor, P=0.005), and were conditioned more often with melphalan-based RIC (62%), while ATG recipients were more frequently conditioned with busulfan-based RIC (84%). Median time to neutrophil engraftment (>500 ANC) was 16 days in ATG recipients, versus 12 days in alemtuzumab recipients (P<0.001). The incidence of grade II-IV acute GVHD was 28% in ATG recipients (9 patients with grade IV) and 24% (NS) in alemtuzumab recipients (2 patients with grade IV). Two-year incidences of chronic GVHD, relapse and NRM were 45%, 23% and 14%, respectively, in ATG recipients, and 47% (NS), 25% (NS) and 25% (P=0.008), respectively, in alemtuzumab recipients. Two-year OS and LFS were 69% and 63%, respectively, in ATG recipients, versus 55% (P=0.003) and 51% (P=0.02), respectively, in alemtuzumab recipients. Death from infection occurred in 7% of ATG recipients, versus 12% of alemtuzumab recipients. When the analysis was restricted to the 210 patients given grafts from 10/10 HLA-matched unrelated donors, the use of alemtuzumab (n=64) remained signifi cantly associated with higher NRM (22% vs 9%, P=0.007), lower LFS (58% vs 69%, P=0.07), and lower OS (62% vs 74%, P=0.04). In multivariate analyses (performed in patients given grafts from 10/10 HLA-matched donors), in comparison to the use of ATG, the use of alemtuzumab was associated with higher NRM (HR=2.5, P=0.025), a statistically non-signifi cant but higher relapse rate (HR=1.7, P=0.18), and signifi cantly worse LFS (HR=0.5, P=0.013) and OS (HR=0.4, P=0.002). In summary, this homogeneous cohort of AML patients transplanted in fi rst CR and given PBSC grafts from unrelated donors, the use of alemtuzumab in comparison with ATG was associated with worse LFS and OS. [less ▲]

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See detailImpact of an anxious social situation on emotional facial expressions (EFE) recognition in children
Dethier, Marie ULg; Taskin, Asliane; Blairy, Sylvie ULg

Poster (2010, June 04)

Socially anxious children have difficulties to interact adequately with others. The core characteristic of social anxiety, the fear of being negatively evaluated by others, may among others, be based on ... [more ▼]

Socially anxious children have difficulties to interact adequately with others. The core characteristic of social anxiety, the fear of being negatively evaluated by others, may among others, be based on problems with the decoding of other persons’ emotional facial expression (EFE). Up to now, the research on EFE recognition in socially anxious children has produced mixed results. Whereas some studies reported differences between anxious and healthy children in EFE recognition (e.g., Simonian, Beidel, Turner, Berkes, & Long, 2001), others didn’t find such differences (Melfsen & Florin, 2002). In this study, we addressed two new issues in the investigation of EFE recognition in socially anxious children. Firstly, we investigated self-esteem. Socially anxious children show low confidence in one’s cognitive and social abilities. Furthermore, high self-esteem is related to high capacities of EFE recognition (Garfield, Rogoff, & Steinberg, 1987), and more generally to high level of social functioning (Serretti et al., 1999 ; Shapira et al., 1999). Indeed, the perception of ourselves depends on the way we think others people perceive us. Secondly, past researches have investigated this issue in low anxious situations and thus, not in situations in which social anxious individuals feel threatened. The originality of the present study is that it addresses the relationship between EFE recognition performance and self-esteem in children placed in an anxious social situation. We predicted a low capacity to decode EFE in socially anxious children. Moreover, we hypothesised a relationship between a low self-esteem and difficulties to decode accurately EFE in an anxious social situation. Seventy children (8 – 12 years) were placed in an anxious social situation of performance in which they were instructed to count aloud backwards, beginning at 200 in increments of 13. Children assessed their emotional feeling state, including their degree of anxiety, before and after the anxious social situation. Furthermore, children were assessed on an EFE decoding test consisting of 16 photographs depicting EFE of happiness, anger, disgust, and sadness. For each photograph, they evaluated the presence of nine types of emotions on a 7-point Likert scale. They also completed the Self-Perception Profile for Children (Harter, 1985). No correlations emerged between the accuracy of EFE recognition and an increase of anxious feelings after the anxious social situation. However, self-esteem was correlated with performance on the EFE recognition test, r (70) = -.33, p < .01. Moreover, the lower the child’s level of self-esteem was, the more he/she perceived negative emotions (fear, anger, disgust, and shame) in EFE of anger. In conclusion, social anxiety doesn’t seem to interfere with EFE recognition performance in an anxious social situation. However, low level of self-esteem in children appears to be associated with deficits and interpretative bias in EFE recognition in an anxious social situation. The recognition of the expression of anger, an emotion socially threatening, seems particularly biased in children with low level of self-esteem. [less ▲]

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See detailImpact of an anxious social situation on emotional facial expressions (EFEs) recognition in children
Dethier, Marie ULg; Taskin, Aslihan Serap; Blairy, Sylvie ULg

in Revue Francophone de Clinique Comportementale et Cognitive (2012), 17(2), 2-9

This study addresses the relationship between the capacity of emotional facial expressions (EFEs) recognition and self-esteem in children placed in an anxious social situation. Seventy children (8 – 12 ... [more ▼]

This study addresses the relationship between the capacity of emotional facial expressions (EFEs) recognition and self-esteem in children placed in an anxious social situation. Seventy children (8 – 12 years) were placed in an anxious social situation of performance in which they were instructed to count aloud backwards, beginning at 200 in decrements of 13. After that, children were assessed on a decoding test of 16 photographs depicting EFE. For each photograph, they evaluated the presence of nine types of emotions. They also completed the Self-Perception Profile for Children (Pierrehumbert et al., 1987). No correlations emerged between the accuracy of EFE recognition and an increase of anxious feelings after the anxious social situation. However, self-esteem was correlated with performance on the EFE recognition test. Moreover, the lower the child’s level of self-esteem was, the more he/she perceived negative emotions in EFEs. In conclusion, social anxiety doesn’t seem to interfere with EFEs recognition performance in an anxious social situation. However, low level of self-esteem in children appears to be associated with deficits and interpretative bias in EFEs recognition in an anxious social situation. [less ▲]

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See detailImpact of an ultra-trail of 330 km on plasma levels of cardiac biomarkers
LE GOFF, Caroline ULg; Kaux, Jean-François ULg; Gergelé, Laurent et al

in European Journal of Sports Medicine (2015, September), 3(Suppl 1), 77

Introduction/Aim: While a moderate exercise produces beneficial effects on the cardiovascular system, consequences of a supraphysiological effort are not yet clear. The aim of our study was to evaluate ... [more ▼]

Introduction/Aim: While a moderate exercise produces beneficial effects on the cardiovascular system, consequences of a supraphysiological effort are not yet clear. The aim of our study was to evaluate the consequences of such an effort on cardiac markers, markers of inflammation but also markers of renal function. This project also studied the evolution of new biomarkers of cardiac fibrosis such as the ST2 and galectin-3. Material and Methods: 51 people attending the Tor des Géants (330 km, with an altitude range of 24,000 meters) have been followed. The study is conducted on 33 participants having reached at least half of the race (148.7 km). Blood and urine samples were collected at four different times: before the race, halfway, at the finish and three days after arrival. Several biomarkers were assayed on different analyzers such COBAS®, KRYPTOR®, VIDAS® and ETIMAX®. Meanwhile, the ST2 was measured manually. Results: During this ultra-endurance effort, the plasma levels of cardiac markers (hsTnT, NT-proBNP, copeptin, H-FABP, ST2, Gal-3), muscle (CK, myoglobin) and inflammation (CRP DFO, GB) have increased significantly to halfway (148.7 km). Meanwhile, the markers of renal function (urinary NGAL and plasma and urinary creatinine) have only slightly varied, excepting plasma creatinine. Conclusions: The study suggests that there is no permanent structural damage at the myocardium level. However, the low pace adopted by the runners, due to fatigue, caused an inflammatory response as well as muscle damage less important than a shorter race. Nevertheless, an endurance race as the Tor des Géants means an intense physical and psychological effort. [less ▲]

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See detailImpact of ancient charcoal kilns on chemical properties of several forest soils after 2 centuries
Dufey, Joseph; Hardy, Brieuc; Cornelis, Jean-Thomas ULg

in Geophysical Research Abstracts (2014)

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See detailImpact of anisotropy and viscosity to model the mechanical behavior of Ti-6A1-4V alloy
Tuninetti Vásquez, Victor ULg; Habraken, Anne ULg

in Materials Science and Engineering: A (2014), (605), 39-50

This paper compares the predictions of an isotropic-thermo-elasto-viscoplastic approach and of an anisotropic-thermo-elastoplastic one with experimental results representative of the mechanical behavior ... [more ▼]

This paper compares the predictions of an isotropic-thermo-elasto-viscoplastic approach and of an anisotropic-thermo-elastoplastic one with experimental results representative of the mechanical behavior of Ti-6Al-4V at moderate temperatures and low strain rates. The first model is the well known Norton-Hoff viscoplastic constitutive law with isotropic von Mises yield locus identified by using monotonic tension tests performed at strain rates from 10-3 s-1 to 10-1 s-1 and at temperatures up to 400°C. The second model is a thermo-elasto-plastic one defined by the orthotropic yield criterion CPB06. It takes into account the anisotropy and the strength differential (SD) effect in tension-compression of Ti-6Al-4V at RT, 150°C and 400°C. The identification of the SD effect is done by using tension and compression tests and the anisotropy behavior is identified by using shear, plane strain, tension and compression tests performed in three orthogonal material directions. The accuracy of the load and displacements predictions of the two macroscopic constitutive models are compared to experimental results obtained from tests performed on specimens with multiaxial loadings and large strain at several temperatures. [less ▲]

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