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Kriging-based reliability analysis of the long-term stability of a deep driftconstructed in the Callovo-Oxfordian claystone

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第5期13卷 1033-1046页

作者： Ngoc-Tuyen Tran Duc-Phi Do Dashnor Hoxha Minh-Ngoc Vu gilles Armand Univ.Orléans Univ.ToursINSA CVLLaméEA 7494France Andra R&D Division92298Chatenay-MalabryFrance

Callovo-Oxfordian(COx)claystone has been considered as a potential host rock for geological radioactive waste disposal in France(Cigéo project).During the exploitation phase(100 years),the stability of drifts(***/alveoli)within the disposal is assured by the liner,which includes two layers:concrete arch segment and compressible *** latter exhibits a significant deformation capacity(about 50%)under low stress(<3 MPa).Although the response of these underground structures can be governed by complex thermo-hydro-mechanical coupling,the creep behavior of COx claystone has been considered as the main factor controlling the increase of stress state in the concrete liner and hence the long-term stability of ***,by focusing only on the purely mechanical behavior,this study aims at investigating the uncertainty effect of the COx claystone time-dependent properties on the stability of an alveolus of Cigéo during the exploitation *** describe the creep behavior of COx claystone,we use Lemaitre’s viscoplastic model with three parameters whose uncertainties are identified from laboratory creep *** the reliability analysis,an extension of a well-known Kriging metamodeling technique is proposed to assess the exceedance probability of acceptable stress in the concrete liner of the *** open-source code Code_Aster is chosen for the direct numerical evaluations of the performance *** Kriging-based reliability analysis elucidates the effect of the uncertainty of COx claystone on the long-term stability of the concrete ***,the role of the compressible material layer between the concrete liner and the host rock is also highlighted.

关键词： Reliability analysis Kriging metamodeling Time-dependent behavior Compressible material Callovo-Oxfordian(COx)claystone Long-term stability

Surface complexation modeling of Eu(Ⅲ) adsorption on silica in the presence of fulvic acid

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Science China Chemistry 2014年第9期57卷 1276-1282页

作者： YE YuanLv CHEN ZongYuan MONTAVON gilles JIN Qiang GUO ZhiJun WU WangSuo Radiochemistry Laboratory School of Nuclear Science and TechnologyLanzhou University Laboratoire SUBATECH UMR 6457 CNRS-IN2P3/Ecole des Mines de Nantes/PRES UNAM4 rue A. Kastler 44307 Nantes CedexFrance

Humic substances （HS） substantially affect heavy metal （M） adsorption on mineral surfaces. However, quantitative descriptions of ternary systems involving M, HS and mineral surfaces remain unclear. This study examines adsorption in a model ternary system including Eu（III）, fulvic acid （FA） and silica, and describes the adsorption of Eu（III） and FA by combining a double-layer model （DLM） and the Stockholm humic model （SHM）. SHM explains the binding of H＋ and Eu^3＋ to EA and the DLM for FA and Eu（Ill） adsorption on silica. Experimental results showed that the presence of FA promotes Eu（III） adsorp- tion at acidic pH values, but decreases it at basic pH values, which indicates the formation of ternary surface complexes. Modeling calculations have shown that two ternary surface complexes are required to describe the experimental results in which Eu^3＋ acts as a bridge between the surface site and FA. The present study suggests that the discrete-site approach to HS is a promising method for interpreting the adsorption data for M, HS and mineral ternary systems.

关键词： Eu(III) fuivic acid adsorption silica Stockholm humic model

Effects of Yoga Interventions on Psychological Health and Performance of Competitive Athletes:A Systematic Review

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Journal of Science in Sport and Exercise 2021年第2期3卷 158-166页

作者： Elena Grilli Cadieux Claudia Gemme gilles Dupuis Department of Psychology Universitédu QuébecàMontréalMontréalQcCanada Laboratoire de Psychologie de la Santéet Qualitéde vie(LEPSYQ) MontréalQcCanada Montreal Behavioural Medicine Centre Centre IntégréUniversitaire de Santéet Services Sociaux du Nord-de-l’Île-de-Montréal(CIUSSS-NIM)Hôpital du Sacré-Coeur de MontréalMontréalQcCanada

Quality of life and psychological health in the field of competitive sport are emergent research topics,specifically for issues such as sport anxiety and *** the rise of contemplative practices,yoga has started to be used and included as part of athletes' mental *** study aimed to systematically review the literature on the impact of yoga interven-tions on quality of life,performance anxiety and sport performance among healthy elite adult *** on PRISMA guidelines,this systematic review includes articles published up to December *** search strategy was conducted in six databases (PUBMED,EMBASE,PsycINFO,SCOPUS,SportDiscuss and (E)rudit).Screened by two independent researchers,only six of the 37 articles drawn from the search met the preselected inclusion criteria and moved forward to the data extraction *** from six trials of poor quality (M =46.91%,SD =13.39,IRR of 92%) were included in this comprehensive literature search,indicating that elite athletes benefit from yoga interventions (with or without mindful-ness),in terms of changes in performance anxiety M =65% (SD =122.49),sport performance M =7.9% (SD =5.46) and life *** interventions lasted on average 5.7 weeks (SD =2.07).Based on the collected evidence,methodological and measurement limitations of the sport psychology literature should be addressed to improve the replicability of reported ***,this review provides encouraging but limited evidence for the value of yoga interventions in healthy adult ***,the important reporting inconsistencies and theoretical limitations that have been raised highlight the need for trials with greater methodological rigor.

关键词： Yoga Applied sport psychology Systematic review

Peter Paul Rubens 1577-1640

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Peter Paul Rubens 1577-1640

The effects of a bike active video game on players' physical activity and motivation

作者： gilles Neret.

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Journal of Sport and Health Science 2017年第1期6卷 25-32,127页

作者： Denis Pasco Cédric Roure gilles Kermarrec Zachary Pope Zan Gao School of Education The University of Bourgogne Franche-ComtéBesançon 25000France Faculty of Movement Sciences The Catholic University of LouvainLouvain-La-Neuve B-1348Belgium Faculty of Sport Science and Education The University of Brittany-LoireBrest 29200France School of Kinesiology The University of MinnesotaMinneapolisMN 55455USA

Background: Players may not acquire adequate levels of moderate-to-vigorous physical activity(MVPA) when playing commercial video *** study's goal was to evaluate the effects of an exercise bike video game played by using a mobile application-based exergame that was designed exclusively to promote participants' MVPA, with additional attention paid to this game's ability to promote greater situational ***: An experimental design was used with 163 students(aged 20.31 ± 1.30, 18–26 years, 61.3% male), all of whom were randomly allocated into an experimental group and a control group. Physical activity(PA) levels were assessed with Acti Graph GT3X+(Acti Graph Inc., Fort Walton Beach, FL, USA) accelerometers. The situational interest scale was used to evaluate students' situational interest in both *** analysis of variance was conducted to examine the differences between sedentary behavior, PA levels, and situational interest between groups. Regression analyses were also used, with the purpose being to evaluate the strength of the relationship between PA and situational ***: Results revealed that the experimental group had higher degrees of sedentary behavior, light PA, total interest, instant enjoyment,exploration intention, attention demand, novelty, and challenge, whereas the control group received higher scores for MVPA(control 95.01% *** group 89.94%). Regression analysis indicated that instant enjoyment(β = 0.49, p < 0.01), exploration intention(β = 0.18, p < 0.05),and attention demand(β = 0.17, p < 0.05) were positive predictors for total interest, explaining 43% of its ***: A newly designed mobile application-based exergame played via an exercise bike may enhance situational interest and provide a decent level of PA for players.

关键词： Design Exergame Moderate-to-vigorous physical activity Sedentary behavior Situational interest Young adults

Fading indirect effects in a warming arctic tundra

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Current Zoology 2014年第2期60卷 189-202页

作者： Joēl BETY Maude GRAHAM-SAUVE Pierre LEGAGNEUX Marie-Christine CADIEUX gilles GAUTHIER Centre d'études nordiques et D6partement de biologie Universit6 du Québec à Rimouski 300 All6e des Ursulines Rimouski Qu6bec Canada G5L 3Al Centre d'études nordiques et Département de biologie Pavilion Vachon Université Laval Qu6bec Qu6bec Canada G 1K 7P4

Indirect interactions in food webs can strongly influence the net effect of global change on ecological communities yet they are rarely quantified and hence remain poorly understood. Using a 22-year time series, we investigated climate-induced and predator-mediated indirect effects on grazing intensity in the tundra food web of Bylot Island, which experienced a warming trend over the last two decades. We evaluated the relative effects of environmental parameters on the proportion of plant biomass grazed by geese in wetlands and examined the temporal changes in the strength of these cascading effects. Migrating geese are the dominant herbivores on Bylot Island and can consume up to 60% of the annual production of wetland graminoids. Spring North Atlantic Oscillation, mid-summer temperatures and summer abundance of lemmings （prey sharing predators with geese） best-explained annual variation in grazing intensity. Goose grazing impact increased in years with high temperatures and high lemming abundance. However, the strength of these indirect effects on plants changed over time. Grazing intensity was weakly explained by environmental factors in recent years, which were marked by a sharp increase in plant primary production and steady decrease in grazing pressure. Indirect effects do not seem to be reversing the direct positive effect of warming on wetland plants. We suggest that cascading effects on plants may lag considerably behind direct effects in vertebrate dominated arctic communities, especially where key herbivore populations are strongly affected by factors outside of the Arctic [Current Zoology 60 （2）： 189-202, 2014].

关键词： Climate change Herbivore-mediated effects Tundra food web Trophic cascade Grazing Goose

Performance of a Markovian neural network versus dynamic programming on a fishing control problem

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Probability, Uncertainty and Quantitative Risk 2023年第1期8卷 121-140页

作者： Mathieu Laurière gilles Pagès Olivier Pironneau NYU Shanghai Shanghai200122China LPMA Sorbonne Université75006ParisFrance LJLL Sorbonne Université75006ParisFrance

Fishing quotas are unpleasant but efficient to control the productivity of a fishing site.A popular model has a stochastic differential equation for the biomass on which a stochastic dynamic programming or a Hamilton-Jacobi-Bellman algorithm can be used to find the stochastic control–the fishing *** compare the solutions obtained by dynamic programming against those obtained with a neural network which preserves the Markov property of the *** method is extended to a multi species model and shows that the Neural Network is usable in high dimensions.

关键词： Stochastic optimal control Partial differential equations Neural networks Population dynamics

Gustav Klimt, 1862-1918

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Gustav Klimt, 1862-1918

Melt pool monitoring in laser beam melting with two-wavelength holographic imaging

作者： gilles Ne?ret.

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Light(Advanced Manufacturing) 2022年第1期3卷 154-165页

作者： Matthieu Piniard Beatrice Sorrente gilles Hug Pascal Picart DOTA ONERAUniversitéParis Saclay91123 PalaiseauFrance Laboratoire d’Étude des Microstructures ONERA-CNRSUMR 10429 Avenue de la Division Leclerc92320 ChâtillonFrance Laboratoire d’Acoustique de l’Universitédu Mans CNRS 6613Institut d’Acoustique-Graduate School(IAGS)Le Mans UniversitéAvenue Olivier Messiaen72085 Le MansFrance

Over the past two decades, laser beam melting has emerged as the leading metal additive manufacturing process for producing small- and medium-size structures. However, a key obstacle for the application of this technique in industry is the lack of reliability and qualification mainly because of melt pool instabilities during the laser-powder interaction, which degrade the quality of the manufactured components. In this paper, we propose multi- wavelength digital holography as a proof of concept for in situ real-time investigation of the melt pool morphology. A two-wavelength digital holographic setup was co-axially implemented in a laser beam melting facility. The solidified aluminum tracks and melt pools during the manufacturing of 316L were obtained with full- field one-shot acquisitions at short exposure times and various scanning velocities. The evaluation of the complex coherence factor of digital holograms allowed the quality assessment of the phase reconstruction. The motion blur was analyzed by scanning the dynamic melt pool.

关键词： Laser beam melting Optical diagnostic Digital holography Multi-wavelength holography