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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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Hybrid remote quantum dot/powder phosphor designs for display backlights

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Light(Science & Applications) 2016年第1期5卷 11-19页

作者： Sofie Abe Jonas J Joos Lisa IDJ Martin Zeger Hens philippe F Smet Department of Inorganic and Physical Chemistry Ghent UniversityGentBelgium Department of Solid State Sciences LumiLabGhent UniversityGentBelgium Center for Nano and Biophotonics Ghent UniversityGentBelgium

Quantum dots are ideally suited for color conversion in light emitting diodes owing to their spectral tunability,high conversion efficiency and narrow emission *** properties are particularly important for display backlights;the highly saturated colors generated by quantum dots justify their higher production ***,we demonstrate the benefits of a hybrid remote phosphor approach that combines a green-emitting europium-doped phosphor with red-emitting CdSe/CdS core/shell quantum *** stacking geometries,including mixed and separate layers of both materials,are studied at the macroscopic and microscopic levels to identify the configuration that achieves maximum device efficiency while minimizing material *** influence of reabsorption,optical outcoupling and refractive index-matching between the layers is evaluated in detail with respect to device efficiency and *** the findings of this study,general guidelines are derived to optimize both the cost and efficiency of CdSe/CdS and other(potentially cadmium-free)quantum dot *** reabsorption of the green and/or red emission is significant compared to the absorption strength for the blue emission of the pumping light emitting diode,the hybrid remote phosphor approach becomes beneficial.

关键词： cost-efficiency lanthanide light emitting diode nanocrystal remote phosphor

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Stem cell retrograde:A new reason why colorectal cancer is more common than small intestinal cancer?

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The Innovation 2023年第2期4卷 7-8页

作者： Rongkang Tang philippe Joseph Sansonetti Yi-Zhou Gao The Center for Microbes Development and HealthInstitut Pasteur of ShanghaiChinese Academy of SciencesShanghai 200031China Unitéde Pathogénie Microbienne Moléculaire Institut Pasteur75015 ParisFrance

The intestine is exposed to a dynamic internal environment that is full of phys-iological stimuli and has a high risk of being invaded by pathogenic *** has dynamic fold units referred to as crypts that are composed of epithelial cells to ward off potential damage from gut *** from the crypt,the small intes-tine(SI)contains villi that is covered by functionally differentiated cells,such as absorptive epithelial cells to maintain nutrient exchange with luminal *** stem cells(ISCs)are responsible for self-repair mechanisms of the intestine *** have the ability to differentiate and proliferate,are well protected,and are located at the bottom of the intestinal crypt structure(Figure 1A).

关键词： intestine epithelium colorectal

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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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A power supply module for autonomous portable electronics:ultralow-frequency MEMS electrostatic kinetic energy harvester with a comb structure reducing air damping

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Microsystems & Nanoengineering 2018年第1期4卷 128-140页

作者： Yingxian Lu Frédéric Marty Dimitri Galayko Jean-Marc Laheurte philippe Basset UniversitéParis-Est ESYCOM(EA2552)CNAMESIEE Paris and UPEMLVNoisyle-Grand 93162France Sorbonne Université LIP6 labCIAN groupJussieu campusParis 75005France UniversitéParis-Est ESYCOM(EA2552)CNAMESIEE Paris and UPEMLVMarne-la-Vallée 77420France

A MEMS electrostatic kinetic energy harvester(e-KEH)of about 1 cm2,working at ultralow frequency(1–20 Hz),without any supported additional mass on its mobile electrode,and working even without a vacuum environment is *** prototype is especially suitable for environments with abundant low frequency motions such as wearable *** proposed e-KEH consists of a capacitor with a finger-teeth interdigited comb *** greatly reduces the air damping effect,and thus the capacitance variation remains important regardless of the presence of *** the new design,the energy transduced per cycle of excitation is no less than 33 times higher than the classic design within 10–40 Hz/2 g_(peak),while is 85 times higher at 15 Hz/2 g_(peak).An enclosed miniature ball combined with non-linear stoppers enables the oscillation of the movable electrode through impact-based frequency up-conversion mechanism,which is also improved by the low air *** to this new design,a higher efficiency than the classic gap-closing comb structure is obtained,as a larger range of working frequency(1–180 Hz)in air.A maximum energy conversion of 450 nJ/cycle is obtained with a bias voltage of 45 V and an acceleration of 11 Hz,3 g_(peak).Working with a diode AC-DC rectifier,the proposed KEH is able to support up to 3 RFID communications within 16 s while operated at 11 Hz,3 g_(peak).

关键词： autonomous kinetic electrostatic

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Diagnostic description and geographic distribution of four new cryptic species of the blue-spotted maskray species complex(Myliobatoidei:Dasyatidae;Neotrygon spp.)based on DNA sequences

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Journal of Oceanology and Limnology 2018年第3期36卷 827-841页

作者： philippe BORSA Irma S.ARLYZA Thierry B.HOAREAU Kang-Ning SHEN Institut de Recherche pour le Développement(IRD) UMR 250"Ecologie Marine Tropicale des Oceans Pacifique et Indien"BP A598848 NouméaNew Caledonia Lembaga Ilmu Pengetahuan Indonesia(LIPI) Pusat Penelitian Oseanografi(P20)JakartaIndonesia Molecular Ecology and Evolution Programme Department of GeneticsUniversity ofPretoriaPretoriaSouth Africa Aquatic Technology Laboratories Agricultural Technology Research InstituteTaiwanChina

Nine morphologically similar but genetically distinct lineages in the blue-spotted maskray species complex, previously Neotrygon kuhlii(Müller and Henle) qualify as cryptic species. Four of these lineages have been previously described as N eotrygon australiae Last, White and Séret, N eotrygon caeruleopunctata Last, White and Séret, N eotrygon orientale Last, White and Séret, and N eotrygon varidens(Garman), but the morphological characters used in the descriptions off ered poor diagnoses and their geographic distributions were not delineated precisely. The objective of the present work is to complete the description of the cryptic species in the complex. Here, an additional four lineages are described as new species on the basis of their mitochondrial DNA sequences: Neotrygon bobwardi, whose distribution extends from the northern tip of Aceh to the western coast of Sumatera; N eotrygon malaccensis, sampled from the eastern part of the Andaman Sea and from the Malacca Strait; N eotrygon moluccensis, from the eastern half of the Banda Sea; and Neotrygon westpapuensis from the central portion of northern West Papua. The geographic distributions of N. australiae, N. coeruleopunctata, N. orientale, and N. varidens are updated. For each species, a diagnosis is provided in the form of a combination of private or partly-private nucleotides at 2–4 nucleotide sites along a 519-base pair fragment of the CO1 gene. We believe that the present taxonomic revision will provide information relevant to the sound management and conservation of cryptic species of the blue-spotted maskray in the Coral Triangle region.

关键词： molecular taxonomy diagnosis distribution

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Microstructural evolution of a recycled aluminum alloy deformed by equal channel angular pressing process

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International Journal of Minerals,Metallurgy and Materials 2012年第11期19卷 1016-1022页

作者： Thabet Makhlouf Atef Rebhi Jean-philippe Couzinié Yannick Champion Nabil Njah Applied Metallurgy Laboratory Faculty of SciencesUniversity of SfaxBP.1171 (3000) Sfax Institut de Chimie et des Matériaux Paris-Est (ICMPE) CNRS 2-8 rue Henri Dunant 94320 Thiais

The microstructural evolution of a recycled aluminum alloy after equal channel angular pressing （ECAP） up to four passes was investigated using X-ray diffxaction （XRD） analysis and transmission electron microscopy （TEM）. Microhardness tests were performed to determine the associated changes in mechanical properties. An ultrafine-grained material has been obtained with a microstructure showing a mixture of highly strained crystallites. A high density of dislocations was achieved as a result of severe plastic deformation （SPD） through the die. Changes in mechanical behavior are also revealed after ECAP due to strain hardening. Thermal analysis and TEM micrographs ob- tained after annealing indicate the succession of the recovery, recrystallization, and grain growth phenomena. Moreover, the energy stored during ECAP may be related to the dislocation density introduced by SPD. We finally emphasize the role played by the precipitates in this alloy.

关键词： aluminum alloys equal channel angular pressing (ECAP) microstructural evolution precipitates

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Analysis and Classification of Fake News Using Sequential Pattern Mining

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BIG DATA MINING AND ANALYTICS 2024年第3期7卷 942-963页

作者： Nawaz, M. Zohaib Nawaz, M. Saqib Fournier-Viger, philippe He, Yulin Shenzhen Univ Coll Comp Sci & Software Engn Shenzhen 518060 Peoples R China Guangdong Lab Artificial Intelligence & Digital Ec Shenzhen 518107 Peoples R China Univ Sargodha Fac Comp & Informat Technol Dept Comp Sci Sargodha 40100 Pakistan

Disinformation, often known as fake news, is a major issue that has received a lot of attention lately. Many researchers have proposed effective means of detecting and addressing it. Current machine and deep learning based methodologies for classification/detection of fake news are content-based, network (propagation) based, or multimodal methods that combine both textual and visual information. We introduce here a framework, called FNACSPM, based on sequential pattern mining (SPM), for fake news analysis and classification. In this framework, six publicly available datasets, containing a diverse range of fake and real news, and their combination, are first transformed into a proper format. Then, algorithms for SPM are applied to the transformed datasets to extract frequent patterns (and rules) of words, phrases, or linguistic features. The obtained patterns capture distinctive characteristics associated with fake or real news content, providing valuable insights into the underlying structures and commonalities of misinformation. Subsequently, the discovered frequent patterns are used as features for fake news classification. This framework is evaluated with eight classifiers, and their performance is assessed with various metrics. Extensive experiments were performed and obtained results show that FNACSPM outperformed other state-of-the-art approaches for fake news classification, and that it expedites the classification task with high accuracy.

关键词： Measurement Accuracy Linguistics Feature extraction Real-time systems Classification algorithms Data mining disinformation fake news sequential pattern mining (SPM) frequent patterns classification

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Nonlinear increase,invisibility,and sign inversion of a localized fs-laser-induced refractive index change in crystals and glasses

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Light(Science & Applications) 2020年第1期9卷 1398-1409页

作者： Jerome Lapointe Jean-philippe Berube Yannick Ledemi Albert Dupont Vincent Fortin Younes Messaddeq Real Vallee Centre d’Optique Photonique et Laser2375 Rue de la TerrasseUniversite LavalG1V 0A6 QuebecQCCanada

Multiphoton absorption via ultrafast laser focusing is the only technology that allows a three-dimensional structural modification of transparent ***,the magnitude of the refractive index change is rather limited,preventing the technology from being a tool of choice for the manufacture of compact photonic integrated *** propose to address this issue by employing a femtosecond-laser-induced electronic band-gap shift(FLIBGS),which has an exponential impact on the refractive index change for propagating wavelengths approaching the material electronic resonance,as predicted by the Kramers–Kronig *** by theoretical calculations,based on a modified Sellmeier equation,the Tauc law,and waveguide bend loss calculations,we experimentally show that several applications could take advantage of this ***,we demonstrate waveguide bends down to a submillimeter radius,which is of great interest for higher-density integration of fs-laser-written quantum and photonic *** also demonstrate that the refractive index contrast can be switched from negative to positive,allowing direct waveguide inscription in ***,the effect of the FLIBGS can compensate for the fs-laser-induced negative refractive index change,resulting in a zero refractive index change at specific wavelengths,paving the way for new invisibility applications.

关键词： waveguide millimeter refractive

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A new CGMW map： The structural map of the Indian Ocean： An attempt at ocean cartography

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Episodes 2004年第3期27卷 199-202页

作者： Ségoufin, Jacques Munschy, Marc Mendel, Véronique Bouysse, philippe Institut de Physique du Globe Paris France EOST Strasbourg France CGMW 75005 Paris 77 rue Claude-Bernard France

The Commission for the Geological Map of the World (CGMW), an IUGS affiliated body, has just issued the first edition of the Structural Map of the Indian Ocean which was presented during the 32nd IGC (Florence). During the 1980's, the Commission published the Geological Atlas of the World, which included the maps of the 5 oceans of the globe. Two decades have elapsed and the knowledge of the sea-floor experienced very significant progress; therefore some 5 years ago, the Commission decided to launch a new type of ocean mapping. The Structural Map of the Indian Ocean is the first of this new series of maps.

关键词： CGMW 印度洋海洋绘图法南极地区地理信息

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