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Machine learning and Bayesian optimization for performance prediction of proton-exchange membrane fuel cells

Energy and AI 2024年第3期17卷 98-112页

作者： Soufian Echabarri Phuc Do Hai-Canh Vu Bastien Bornand universitéde lorraine CNRSCRANF-54000 NancyFrance universitéde Technologie de Compiègne(UTC) CS 60319CEDEX60203 CompiègneFrance Energy designer and IT EODevIssy-Les-Moulineaux92130Paris RegionFrance

Proton-exchange membrane fuel cells (PEMFCs) are critical components of zero-emission electro-hydrogen generators. Accurate performance prediction is vital to the optimal operation management and preventive maintenance of these generators. Polarization curve remains one of the most important features representing the performance of PEMFCs in terms of efficiency and durability. However, predicting the polarization curve is not trivial as PEMFCs involve complex electrochemical reactions that feature multiple nonlinear relationships between the operating variables as inputs and the voltage as outputs. Herein, we present an artificial-intelligence-based approach for predicting the PEMFCs’ performance. In that way, we propose first an explainable solution for selecting the relevant features based on kernel principal component analysis and mutual information. Then, we develop a machine learning approach based on XGBRegressor and Bayesian optimization to explore the complex features and predict the PEMFCs’ performance. The performance and the robustness of the proposed machine learning based prediction approach is tested and validated through a real industrial dataset including 10 PEMFCs. Furthermore, several comparison studies with XGBRegressor and the two popular machine learning-based methods in predicting PEMFC performance, such as artificial neural network (ANN) and support vector machine regressor (SVR) are also conducted. The obtained results show that the proposed approach is more robust and outperforms the two conventional methods and the XGBRegressor for all the considered PEMFCs. Indeed, according to the coefficient of determination criterion, the proposed model gains an improvement of 6.35%, 6.8%, and 4.8% compared with ANN, SVR, and XGBRegressor respectively.

关键词： Proton-exchange membrane fuel cell Hydrogen Machine learning XGBRegressor Tree-structured Parzen estimator Polarization curve Performance predicti on

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Drought events influence nutrient canopy exchanges and green leaf partitioning during senescence in a deciduous forest

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Forest Ecosystems 2024年第1期11卷 110-119页

作者： J.Touche C.Calvaruso P.de Donato M.-P.Turpault INRAE BEFF-54000NancyFrance UMR 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events expected in the coming decades in Western Europe may disturb forest biogeochemical cycles and create nutrient deficiencies in *** possible origin of nutrient deficiency is the disturbance of the partitioning of the green leaf pool during the leaf senescence period between resorption,foliar leaching and senesced ***,the effects of drought events on this partitioning and the consequences for the maintenance of tree nutrition are poorly *** experiment in a beech forest in Meuse(France)was conducted to assess the effect of drought events on nutrient canopy exchanges and on the partitioning of the green leaf pool during the leaf senescence *** aim was to identify potential nutritional consequences of droughts for *** nutrient dynamics,including resorption,chemistry of green and senesced leaves,foliar absorption and leaching in mature beech stands from 2012 to 2019 allowed us to compare the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by almost a third of the potassium(K)partitioning to resorption(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity expected for the coming decades,there will be a risk of potassium deficiency in trees,as already observed in a rainfall exclusion experiment on the same study *** foliar leaching and higher parititioning to the senesced leaves for K and phosphorus(P)were also *** addition,a slight increase in nitrogen(N)resorption efficiency occurred during dry years which is more likely to improve tree *** calcium(Ca)negative resorption decreased,with no apparent consequence in our study *** results show that nutrient exchanges in the canopy and the partitioning of the green leaf

关键词： Natural drought Beech forest Canopy Resorption Foliar leaching Senesced leaves Nutrition

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Functional trait composition of carabid beetle communities predicts prey suppression through both mass ratio and niche complementarity mechanisms

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Insect Science 2024年第2期31卷 562-574页

作者： Abdelhak Rouabah Francoise Lasserre-Joulin Sylvain Plantureux Simon Taugourdeau Bernard Amiaud universite de Loraine INRAELAENancyF-54000France UMR SELMET CIRADINRAEInstitut AgroUniversite de MontpellierMontpellier34000France CIRAD UMR SELMET-PPZSDakarSéenegal UMR Siva Universitéde LorraineAgroParisTechINRAEVandoeuvreLes Nancy54506France

Several components of predator functional diversity have been hypothesized to influence prey suppression through either niche complementarity or mass ratio ***,most studies have used a functional group approach when assessing the role of these predators in ecosystem *** adopting a trait-based approach,we evaluated the relative contributions of carabid diversity components in predicting prey *** results highlight the importance of both taxonomic and functional diversity components of carabids as key drivers of prey *** suppression was best predicted by carabid densities,with the dominance of Poecilus cupreus potentially driving the positive effect of community total abundance through the mass ratio *** suppression increased with increasing the density of large *** addition,carabid eye diameter and antennal length were key functional traits for predicting prey ***,prey suppression increased with increasing carabid functional richness following the niche complementarity *** contrast to functional richness,functional evenness and functional divergence of carabid communities were weakly correlated with prey *** identifying which diversity components of carabid communities contribute the most to increase prey suppression,our results can guide efforts aiming to predict the relationship between diversity of these predators and ecosystem functioning.

关键词： abundance distribution biological control body size ecosystem function functional richness predator-prey interactions

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Physical design and recent experimental results of the new ICRF antenna on EAST

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Plasma Science and Technology 2024年第6期26卷 169-176页

作者：杨桦张新军袁帅秦成明张伟 G.URBANCZYK 钱金平刘鲁南王高翔陈青青 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China Institut Jean Lamour UMR 7198 CNRS-universitéde lorraine 2 allée André GuinierNancy 54011France university of Science and Technology of China Hefei 230026People’s Republic of China

Two new ICRF antennas operating in the ion cyclotron radio frequency(ICRF) range have been developed for EAST to overcome the low coupling problem of the original *** original ICRF antennas were limited in their power capacity due to insufficient *** new antenna design takes into account both wave coupling and absorption processes through comprehensive wave coupling and absorption codes,with the dominant parallel wave number k∥of 7.5 m-1at dipole *** the use of these new ICRF antennas,we are able to achieve 3.8 MW output power and 360 s operation,*** initial experimental results demonstrate the reliability of the antenna design method.

关键词： ICRF antenna coupling EAST

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Provenance and Paleoclimate of the Triassic to Middle Jurassic Adigrat Sandstone,Blue Nile Basin,Central Ethiopia

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Acta Geologica Sinica(English Edition) 2024年第4期98卷 1007-1020页

作者： Bekele BARSISA Ayalew deREJE Kidanemariam GILAMICHAEL Atnafu BALEMWAL Raphaël PIK department of Earth Sciences Wollega UniversityNekemteEthiopia department of Earth Sciences Addis Ababa UniversityAddis AbabaEthiopia departments of Anthropology Geography and GeologyEast Los Angeles CollegeLos AngelesCaliforniaUSA CRPG(UMR 7358 CNRS&universitéde lorraine) 15 rue ND des pauvres BP2054501 Vandoeuvre-Lès-Nancy CedexFrance

Mineralogical and geochemical studies have been undertaken on the Triassic to Lower Jurassic Adigrat Sandstone of the Blue Nile Basin of central Ethiopia to infer its source rock type,paleoweathering,and paleoclimatic *** Adigrat Sandstone occurs at the basal section of the Mesozoic sedimentary formation and unconformably overlays the Neoproterozoic–Paleozoic crystalline rocks,or locally,the Karroo sediments in the northern Blue Nile Basin.A mineralogical study reveals that quartz(Q),feldspars(F),and lithic fragments(L)are the framework grains of the *** the QFL diagram,the plot of the modal composition of the sandstone mainly falls within the feldspathic arenite and quartzose arenite *** geochemical data of the lower section of the sandstone mainly falls within the arkose and subarkose fields,whereas the upper section data falls within the quartzose and sublithic arenite *** and geochemical weathering indices indicate that the provenances of the Adigrat Sandstone were exposed to pronounced weathering intensity,where the lower part of the sandstone was controlled by arid to semi-arid conditions,whereas the upper section was linked to humid to semi-humid(tropical to subtropical)climatic *** and geochemical data also indicate that mafic to intermediate basement rocks were the primary source rocks of the *** the sediment was assumed to have been reworked by multi-cyclic sedimentary *** discriminant function diagram,the REE pattern,La/Th ***/Yb,and the Th–Hf–Co plot are consistent.A comparison of provenance studies for the Adigrat Sandstone in the Blue Nile Basin and the Mekele outlier of northern Ethiopia indicates that the sediment of the former is highly sorted,experienced higher weathering intensity,and compositionally derived from mafic to intermediate crystalline *** the other hand,the sediment of the latter is essentially a weathering product of felsic rocks.

关键词： mineralogical geochemical paleoweathering humid provenance Adigrat Sandstone

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Dual inhibition of sirtuins 1 and 2:reprogramming metabolic energy dynamics in chronicmyeloid leukemia as an immunogenic anticancer strategy

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Cancer Communications 2024年第8期44卷 921-925页

作者： Michael Schnekenburger Anne Lorant Sruthi Reddy Gajulapalli Ridhika Rajora Jin-Young Lee Aloran Mazumder Haeun Yang Christo Christov Hyoung Jin Kang Bernard Pirotte Marc Diederich Laboratoire de Biologie Moleculaire et Cellulaire du Cancer LuxembourgLuxembourg Research Institute of Pharmaceutical Sciences&Natural Products Research Institute College of PharmacySeoul National UniversitySeoulRepublic of Korea Faculte de Medecine Universite de LorraineVandoeuvre-les-NancyFrance department of Pediatrics Seoul National University College of MedicineSeoul National University Cancer Research InstituteSeoul National University Children’s HospitalSeoulRepublic of Korea Laboratory of Medicinal Chemistry Center for Interdisciplinary Research on Medicines(CIRM)University of LiegeLiegeBelgium

Chronicmyeloid leukemia(CML)is a lethal hematopoietic malignancy with a global incidence primarily attributed to the breakpoint cluster region-Abelson(BCR-ABL1)fusion oncogene in over 95%of *** introduction of tyrosine kinase inhibitors(TKIs)has revolutionized CML management;however,a subset of patients encounters challenges such as resistance and relapse,hindering the achievement of complete *** these challenges in CML also requires addressing persistent leukemia stem cells(LSCs)with inherent resistance *** regulators of LSC metabolism,proliferation,and survival,as well as genetic and epigenetic alterations,provide potential targets[1].

关键词： metabolism myeloid alterations

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determinationofelasticmodulus of claystone:Nano-/micro-indentation andmeso-compression tests used to investigate impact of alkaline fluid propagation over 18 years

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 129-136页

作者： Danièle Bartier Christophe Auvray GeoRessources UMR 7359 Université de Lorraine CNRS CREGU Campus Aiguillettes Vandoeuvre-les-Nancy 54500 France

Micro-mechanical properties of a claystone were tested after undergoing alkaline perturbation on site(Tournemire,CD borehole)for 18 *** a saturated context and outside the excavation disturbed zone(EDZ),the claystone exhibits a 11.6-mm black rim at the cement/paste interface,which shows a different mechanical behaviour from the rest of the *** sets of measurements of elastic modulus were performed using:(i)nano-indentation tests with a constant indentation depth of 2 mm,(ii)microindentation tests with a constant indentation depth of 20 mm,and(iii)meso-compression tests with a constant displacement of 200 *** increase of the modulus of deformability in the black rim is between 15 GPa and 20 GPa according to the ***,an overall decrease of the modulus of deformability from the smallest to the largest scale is observed in each *** view of the mineralogy and petrographic observations,higher values of modulus of deformability in the black rim are related to carbonate content and its *** of cementitious carbonates as inclusions and very thin partings leads to hardening of the claystone.

关键词： Claystone Elastic modulus Nano-indentation Micro-indentation Meso-compression Carbonate Claystone/cement paste contact

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How rock samples can be representative of in situ condition:A case study of Callovo-Oxfordian claystones

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第4期10卷 613-623页

作者： N.Conil J.Talandier H.Djizanne R.de La Vaissière C.Righini-Waz C.Auvray C.Morlot G.Armand Andra URL BureFrance Andra Chatenay-MalabryFrance universitéde lorraine GéoRessources Vandoeuvre-les-NancyFrance

Within the framework of feasibility studies for a reversible, deep geological repository of high-and intermediate-level long-lived radioactive waste(HLW, IL-LLW), the French National Radioactive Waste Management Agency(Andra) is investigating the Callovo-Oxfordian(COx) formation near Bure(northeast part of France) as a potential host rock for the repository. The hydro-mechanical(HM) behaviour is an important issue to design and optimise different components of the disposal such as shaft, ramp, drift,and waste package disposal facilities. Over the past 20 years, a large number of laboratory experiments have been carried out to characterise and understand the HM behaviours of COx claystones. At the beginning, samples came from deep boreholes drilled at the ground surface with oil base mud. From2000 onwards, with the launch of the construction of the Meuse/Haute-Marne Underground Research Laboratory(MHM URL), most samples have been extracted from a large number of air drilled boreholes in the URL. In parallel, various constitutive models have been developed for modelling. The thermohydro-mechanical(THM) behaviours of the COx claystones were investigated under different repository conditions. Core samples are subjected to a complex HM loading path before testing, due to drilling, conditioning and preparation. Various kinds of effects on the characteristics of the claystones are highlighted and discussed, and the procedures for core extraction and packaging as well as a systematic sample preparation protocol are proposed in order to minimise the uncertainties on test results. The representativeness of the test results is also addressed with regard to the in situ rock mass.

关键词： Callovo-Oxfordian (COx) claystone samples Physical properties In situ condition Saturation degree Resaturation process Experimental protocol

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STATIC REGIME IMAGING OF LOCATIONS OF CERTAIN 3D ELECTROMAGNETIC IMPERFECTIONS FROM A BOUNDARY PERTURBATION FORMULA

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Journal of Computational Mathematics 2014年第4期32卷 412-441页

作者： Seraphin M. Mefire IECL CNRS UMR 7502 Universite de Lorraine Faculte des Sciences et Technologies de Nancy 54506 Vandoeuvre-les-Nancy Cedex France

We are concerned, in a static regime, with a three-dimensional bounded domain of certain an imaging approach of the locations in electromagnetic imperfections. This approach is related to Electrical Impedance Tomography and makes use of a new perturbation formula in the electric fields. We present two localization procedures, from a Current Pro- jection method that deals with the single imperfection context and an inverse Fourier process that is devoted to multiple imperfections configurations. These procedures extend those that were described in our previous work, since operating for a broader class of settings. Namely, the localization is additionally performed for certain purely electric imperfections, as established from numerical simulations.

关键词： Inverse problems Maxwell equations Electric fields Inhomogeneities Elec-trical lmpedanee Tomography Current Projection method FFT Numerical boundarymeasurements Random noise Edge elements Least square systems Incomplete ModifiedGram-Schmidt preconditioning.

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deciphering the role of monosaccharides during phage infection of Staphylococcus aureus

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Nano Research 2022年第10期15卷 9234-9242页

作者： Baptiste Arbez Marion Gardette Christophe Gantzer Neus Vilà Isabelle Bertrand Sofiane El-Kirat-Chatel Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement(LCPME) CNRSUniversité de Lorraine405 rue de Vandoeuvre54602 Villers-lès-NancyFrance

As phages are extensively investigated as novel therapy tools but also as transfer agents for antibiotic resistance genes,thorough understanding of phage–host interactions becomes *** for phage infection is its adhesion to the host ***,we used atomic force microscopy-based single-particle force spectroscopy with phage-decorated tips to decipher the adhesion of phage 187 on living Staphylococcus aureus *** found that addition of free N-acetyl-Dglucosamine was able to decrease phage adhesion,suggesting that this monosaccharide plays major role in phage 187 infection of ***,phage 187 adhesion on monosaccharide-coated model surfaces combined with plaque forming unit counts suggested that a direct link can be established between the propensity to bind to a saccharide and the capability of the latter to inhibit phage *** a nanoscale level,single-particle force spectroscopy was successfully used to identify a major receptor required for phage 187 infection of *** but also evidenced that this receptor was responsible for phage adhesion on *** work demonstrates that single-particle force spectroscopy is a powerful platform to screen and predict the molecular target of phages on their host surfaces.

关键词： atomic force microscopy single-particle force spectroscopy phage 187 Staphylococcus aureus phage-bacteria interactions

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