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Machine learning-based prediction of sand and dust storm sources in arid Central Asia

International Journal of Digital Earth 2023年第1期16卷 1530-1550页

作者： Wei Wang Alim Samat Jilili Abuduwaili philippe De Maeyer Tim Van de Voorde State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqiPeople’s Republic of China Research Centre for Ecology and Environment of Central Asia Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqiPeople’s Republic of China University of Chinese Academy of Sciences BeijingPeople’s Republic of China Department of Geography Ghent UniversityGhentBelgium Sino-Belgian Joint Laboratory of Geo-Information GhentBelgium Sino-Belgian Joint Laboratory of Geo-Information UrumqiPeople’s Republic of China

With the emergence of multisource data and the development of cloud computing platforms,accurate prediction of event-scale dust source regions based on machine learning(ML)methods should be considered,especially accounting for the temporal variability in sample and predictor *** Central Asia(ACA)is recognized as one of the world’s primary potential sand and dust storm(SDS)*** this study,based on the Google Earth Engine(GEE)platform,four ML methods were used for SDS source prediction in *** meteorological and terrestrial factors were selected as influencing factors controlling SDS source susceptibility and applied in the modeling ***,the results revealed that the random forest(RF)algorithm performed best,followed by the gradient boosting tree(GBT),maximum entropy(MaxEnt)model and support vector machine(SVM).The Gini impurity index results of the RF model indicated that the wind speed played the most important role in SDS source prediction,followed by the normalized difference vegetation index(NDVI).This study could facilitate the development of programs to reduce SDS risks in arid and semiarid regions,particularly in ACA.

关键词： Susceptibility mapping event scale google earth engine(GEE) remote sensing

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Twinning-induced plasticity(TWIP)effect in multi-phase metastable beta Zr-Nb alloys

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Journal of Materials Science & Technology 2023年第8期139卷 120-125页

作者： Junhui Tang Ahmed Zorgati Jean-Baptiste philippe Vermaut Frédéric Prim Fan Sun PSL Research University Chimie ParisTechCNRS-UMR8247Institut de Recherche de Chimie ParisParis 75005France Sorbonne University Ecole PolytechniquePalaiseau 91128France Gaillard Paris-Saclay University Commissariatàl’Energie AtomiqueService d’Etude des Matériaux IrradiésGif-Sur-Yvette 911191France PSL Research University Chimie ParisTechCNRS-UMR8247Institut de Recherche de Chimie ParisParis 75005France Sorbonne UniversityUPMC University ParisUFR926Paris 75005France

During the last decades,a large amount of scientific works had been devoted toβ-type Zr and Ti alloys for biomedical applica-tions due to their high strength,good corrosion resistance,low magnetic susceptibility and ... 详细信息

关键词： alloys corrosion resistance

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In-process failure analysis of thin-wall structures made by laser powder bed fusion additive manufacturing

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Journal of Materials Science & Technology 2022年第3期98卷 233-243页

作者： Apratim Chakraborty Reza Tangestani Rasim Batmaz Waqas Muhammad philippe Plamondon Andrew Wessman Lang Yuan Étienne Martin University of Waterloo 200 University Avenue WestWaterlooON N2L 3G1Canada Polytechnique Montréal 2500 Chemin de PolytechniqueMontréalQC H3T 1J4Canada University of Arizona 1235 E.James E.Rogers WayTucsonAZ 85721-0012United States University of South Carolina 301 Main StreetColumbiaSC 29208United States

Fabrication of thin-wall components using the laser powder bed fusion(LPBF)additive manufacturing(AM)technology was investigated for two“hard-to-weld”high gamma prime Ni-based superalloys RENé65(R65)and RENé108(R108).Simple block parts with wall thicknesses of 0.25 mm,1.00 mm,and5.00 mm are printed using a bidirectional laser scanning strategy without layer-wise *** with walls thinner than 5 mm fail before reaching the designated build *** indicate that reduction of limiting build height(LBH)corresponds to the reduction of part thickness and is unaffected by alloy *** the contrary,the number of internal micro-cracks along columnar grain boundaries in the build direction(BD)increases with part thickness and is significantly higher in R108 than *** findings suggest that reduced LBH in parts with thinner walls is not caused by internal micro-crack *** and finite element analysis(FEA)of the in-process thermal stresses show that the LBH trend is not explained by the conventional cracking *** suggest that part thickness affects stress distribution leading to more substantial distortion and consequent failure to add layers for continued fabrication of thinner parts.

关键词： Laser powder bed fusion Superalloys Thin-wall Residual stress Additive manufacturing

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A novel observation points‐based positive‐unlabeled learning algorithm

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CAAI Transactions on Intelligence Technology 2023年第4期8卷 1425-1443页

作者： Yulin He Xu Li Manjing Zhang philippe Fournier‐Viger Joshua Zhexue Huang Salman Salloum Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ) ShenzhenChina College of Computer Science and Software Engineering Shenzhen UniversityShenzhenChina School of Computing National University of SingaporeSingaporeSingapore

In this study,an observation points‐based positive‐unlabeled learning algorithm(hence called OP‐PUL)is proposed to deal with positive‐unlabeled learning(PUL)tasks by judiciously assigning highly credible labels to unlabeled *** proposed OP‐PUL algorithm has three ***,an observation point classifier ensemble(OPCE)algorithm is constructed to divide unlabeled samples into two categories,which are temporary positive and permanent negative ***,a temporary OPC(TOPC)is trained based on the combination of original positive samples and permanent negative samples and then the permanent positive samples that are correctly classified with TOPC are retained from the temporary positive ***,a permanent OPC(POPC)is finally trained based on the combination of original positive samples,permanent positive samples and permanent negative *** exhaustive experimental evaluation is conducted to validate the feasibility,rationality and effectiveness of the OP‐PUL algorithm,using 30 benchmark PU data *** show that(1)the OP‐PUL algorithm is stable and robust as unlabeled samples and positive samples are increased in unlabeled data sets and(2)the permanent positive samples have a consistent probability distribution with the original positive ***,a statistical analysis reveals that POPC in the OP‐PUL algorithm can yield better PUL performances on the 30 data sets in comparison with four well‐known PUL *** demonstrates that OP‐PUL is a viable algorithm to deal with PUL tasks.

关键词： artificial intelligence datamining,machine learning

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Observation points classifier ensemble for high-dimensional imbalanced classification

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CAAI Transactions on Intelligence Technology 2023年第2期8卷 500-517页

作者： Yulin He Xu Li philippe Fournier‐Viger Joshua Zhexue Huang Mianjie Li Salman Salloum College of Computer Science&Software Engineering Shenzhen UniversityShenzhenChina Guangdong Laboratory of Artificial Intelligence and Digital Economy(SZ) Shenzhen UniversityShenzhenChina Faculty of Information Technology Macao University of Science and TechnologyMacaoChina School of Computing National University of SingaporeSingaporeSingapore

In this paper,an Observation Points Classifier Ensemble(OPCE)algorithm is proposed to deal with High-Dimensional Imbalanced Classification(HDIC)problems based on data processed using the Multi-Dimensional Scaling(MDS)feature extraction ***,dimensionality of the original imbalanced data is reduced using MDS so that distances between any two different samples are preserved as well as ***,a novel OPCE algorithm is applied to classify imbalanced samples by placing optimised observation points in a low-dimensional data ***,optimization of the observation point mappings is carried out to obtain a reliable assessment of the unknown *** experiments have been conducted to evaluate the feasibility,rationality,and effectiveness of the proposed OPCE algorithm using seven benchmark HDIC data *** results show that(1)the OPCE algorithm can be trained faster on low-dimensional imbalanced data than on high-dimensional data;(2)the OPCE algorithm can correctly identify samples as the number of optimised observation points is increased;and(3)statistical analysis reveals that OPCE yields better HDIC performances on the selected data sets in comparison with eight other HDIC *** demonstrates that OPCE is a viable algorithm to deal with HDIC problems.

关键词： classifier ensemble feature transformation high-dimensional data classification imbalanced learning observation point mechanism

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Numerical analysis of landslide-generated debris flow on July 3, 2021 in Izu Mountain area, Shizuoka County, Japan

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Journal of Mountain Science 2022年第6期19卷 1738-1747页

作者： SUN Tong SUN Dong-ya WANG Xie-kang MA Qiang GOURBESVILLE philippe NOHARA Daisuke State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China China Institute of Water Resources and Hydropower Research Beijing 100038China Universite Cote d'Azur Nice 06903France Sustainable Society Laboratory KAJIMA Technical Research Institute Kyoto University 6110011Japan

With the increasing of extreme rainfall frequency, landslides accompanied by mudslides often lead to serious casualties and property damage. On 3rd July 2021, a debris flow occurred in Izu Mountain area, Shizuoka County, Japan, and then resulted in 26 deaths and 131 houses destroyed, where houses were mainly built along the banks of the creek. In order to analyse the landslide state and distribution, a two-dimensional debris flow dynamic model(Massflow) was selected to simulate the process of the landslide-generated debris flow. When the model results are considered together with remote sensing images, the volume distribution of the unstable landslide is also able to be determined. The results show that(1) the affected areas are mainly concentrated at the outfall of the gully and on both sides of the streets.(2) The pore pressure ratio is an important factor affecting the damage range of this debris flow.(3) The increase of the pore pressure ratio in the landslide make the movement distance of debris flow increase significantly.

关键词： Izu Mountain Landslide Debris flow Numerical simulation Pore pressure ratio

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Well-preserved Devonian galeaspid indicates swimming performance of jawless fishes

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National Science Review 2023年第7期10卷 72-72页

作者： philippe Janvier Museum National d’Histoire Naturelle Sorbonne Universtité

A paper by Gai et al.[1] provides the first detailed description of the tail in an exceptionally well-preserved galeaspid from China,and the authors provide some interesting insights into the mode of life and swimming speed in this group of stem *** are a very peculiar group of *** osteostracans,which are currently regarded as a sister group to jawed vertebrates,their gills are enclosed in depressions,or gill fossae,of the ventral surface of the braincase and open ventrally to the exterior by minute *** some galeaspids there may be～50 such gill fossae on each side;that is,the largest number of branchial units ever recorded in vertebrates,along with *** environment and overall aspect of most gale aspids suggest that they were benthic fishes,and that the flux of respiratory water entered the gill apparatus throughthe median dorsal opening (in fact,

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Advancing the field of rare genitourinary tumors:Challenges and opportunities

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Asian Journal of Urology 2022年第4期9卷 347-348,F0002页

作者： philippe E.Spiess Andrea Necchi Department of Genitourinary Oncology and Tumor Biology Moffitt Cancer CenterTampaUSA Vita Salute San Raffaele University and Urological Research Institute IRCCS San Raffaele Hospital and Scientific InstituteMilanItaly

Firstly,I would like to congratulate the editorial team of the Asion Journol of Urology for dedicating a speclial isue of the joumal to this important *** recent advances in our fundamental understanding of the pathop... 详细信息

关键词： urinary tumors rare

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Direct ammonium oxidation to nitrogen gas (Dirammox) in Alcaligenes strain HO-1: The electrode role

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Environmental Science and Ecotechnology 2023年第3期15卷 121-127页

作者： Narcís Pous Lluis Baneras philippe F-XCorvini Shuang-Jiang Liu Sebastia Puig Laboratory of Chemical and Environmental Engineering(LEQUiA) Institute of the EnvironmentUniversity of GironaCarrer Maria Aurelia Capmany69E-17003GironaSpain Group of Environmental Microbial Ecology Institute of Aquatic EcologyUniversity of GironaC/Maria Aurelia Capmany40E-17003GironaSpain School of Life Sciences University of Applied Sciences and Arts Northwestern SwitzerlandMuttenz4132Switzerland State Key Laboratory of Microbial Resource at Institute of Microbiology Chinese Academy of SciencesBeijing100101China

It has been recently suggested that Alcaligenes use a previously unknown pathway to convert ammonium into dinitrogen gas(Dirammox)via hydroxylamine(NH2OH).This fact alone already implies a significant decrease in the aeration requirements for the process,but the process would still be dependent on external *** work studied the potential use of a polarised electrode as an electron acceptor for ammonium oxidation using the recently described Alcaligenes strain HO-1 as a model heterotrophic *** indicated that Alcaligenes strain HO-1 requires aeration for metabolism,a requirement that cannot be replaced for a polarised electrode ***,concomitant elimination of succinate and ammonium was observed when operating a previously grown Alcaligenes strain HO-1 culture in the presence of a polarised electrode and without *** usage of a polarised electrode together with aeration did not increase the succinate nor the nitrogen removal rates observed with aeration ***,current density generation was observed along a feeding batch test representing an electron share of 3%of the ammonium removed in the presence of aeration and 16%without *** tests suggested that hydroxylamine oxidation to dinitrogen gas could have a relevant role in the electron discharge onto the ***,the presence of a polarised electrode supported the metabolic functions of Alcaligenes strain HO-1 on the simultaneous oxidation of succinate and ammonium.

关键词： Bioelectrochemical systems Electroactive bacteria Microbial electrochemical technologies Nitrification Nitrogen removal

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Flexible Biofoams Based on Furanics and Fatty Acids Esterified Tannin

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Journal of Renewable Materials 2023年第10期11卷 3625-3645页

作者： Elham Azadeh Ummi Hani Abdullah Christine Gerardin Antonio Pizzi philippe Gerardin Cesar Segovia LERMAB University of LorraineBlvd des AiguillettesNancy54000France Department of Wood and Fiber Industries Faculty of Forestry and EnvironmentUniversiti Putra MalaysiaSerdangSelangor43400Malaysia Institute of Tropical Forestry and Forest Products(INTROP) Universiti Putra MalaysiaSerdangSelangor43400Malaysia CETELOR University of LorraineEpinal88000France

Water repellant,flexible biofoams using tannin esterified with various fatty acid chains,namely lauric,palmitic and oleic acids,by reaction with lauryl chloride,palmitoyl chloride,and oleyl chloride were developed and their characteristics compared with the equivalently esterified rigid ***,while initially added to control the reaction temperature,was used as a plasticizer yielding flexible biofoams presenting the same water repellant character that the equivalent rigid *** was used as the cross-linking agent instead of formaldehyde,as it showed a better performance with the esterified *** compression results showed a significant decrease of the Modulus of Elasticity(MOE)of the flexible foams in relation to that of the rigid foams,confirming their flexible *** lauryl-and palmitoyl-esterified biofoams presented similar mechanical properties,while the oleyl-esterified biofoam presented different mechanical and morphological result not really showing the expected *** the esterified rigid and flexible tannin-based biofoams showed good water resistance and their sessile drop contact angle analysis as a function of time confirmed this *** Electron Microscope(SEM)analysis showed the flexible foams to present a higher proportion of closed cells than the rigid ***,the cells depth of the flexible foams was lower than that of the rigid *** regards their thermal resistance,the flexible foams showed a slight loss of mass compared to the rigid ones without *** types of foams presented much lower surface friability of non-esterified rigid foams.

关键词： Flexible tannin-furanic foams esterified tannins water repellence TGA SEM compression

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