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Characterisation and seasonal variations of particles in the atmosphere of rural, urban and industrial areas：Organic compounds

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Journal of Environmental Sciences 2016年第6期28卷 45-56页

作者： Fabrice Cazier Paul Genevray Dorothée Dewaele Habiba Nouali Anthony Verdin Frédéric Ledoux Adam Hachimi Lucie Courcot Sylvain Billet Saad Bouhsina Pirouz Shirali Guillaume Garcon Dominique Courcot Common Center of Measurements (CCM) Univ. Littoral Cote d'Opale F-59140 Dunkirk France Unit of Environmental Chemistry and Interactions with Life UCEIV-EA4492 Univ. Littoral Cote d'Opale F-59140 Dunkirk France MicroPolluants Technologie SA 4 Rue de Bort Les Orgues F-57070 Saint Julien Les Metz France Oceanology and Geosciences Laboratory LOG UMR 8187 Univ. Littoral C6te d'Opale F-62230 Wimereux France Impact of Chemical Environment on Human Health Univ. Lille CHU Lille Institut Pasteur de Lille EA4483-IMPECS 59000 LILLE France

Atmospheric aerosol samples（PM2.5–0.3, i.e., atmospheric particles ranging from 0.3 to2.5 μm） were collected during two periods： spring–summer 2008 and autumn–winter 2008–2009, using high volume samplers equipped with cascade impactors. Two sites located in the Northern France were compared in this study： a highly industrialised city（Dunkirk） and a rural site（Rubrouck）. Physicochemical analysis of particulate matter（PM） was undertaken to propose parameters that could be used to distinguish the various sources and to exhibit seasonal variations but also to provide knowledge of chemical element composition for the interpretation of future toxicological studies. The study showed that PM2.5–0.3concentration in the atmosphere of the rural area remains stable along the year and was significantly lower than in the urban or industrial ones, for which concentrations increase during *** concentrations of polycyclic aromatic hydrocarbons（PAHs）, dioxins, furans and dioxin like polychlorinated biphenyls（DL-PCBs）, generated by industrial activities, traffic and municipal wastes incineration were detected in the samples. Specific criteria like Carbon Preference Index（CPI） and Combustion PAHs/Total PAHs ratio（CPAHs/TPAHs） were used to identify the possible sources of atmospheric pollution. They revealed that paraffins are mainly emitted by biogenic sources in spring–summer whereas as in the case of PAHs, they have numerous anthropogenic emission sources in autumn-winter（mainly from traffic and domestic heating）.

关键词： Environmental monitoring Airborne particles PAHs Paraffins Dioxins

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To eat or get heat： Behavioral trade-offs between thermoregulation and feeding in gregarious necrophagous larvae

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Insect Science 2018年第5期25卷 883-893页

作者： Jana Podhorna Cindy Aubernon Marie Borkovcova Julien Boulay Valery Hedouin Damien Charabidze Department of Zoology Fisheries Hydrobiology and Apiculture Mendel University in Brno Czech Repubfic Unite de Taphonomie Medico-Legale University of Lille CHU Lille EA France

The thermoregulation behavior ofLucilia sericata larvae （Diptera： Calliphori- dae）, a necrophagous species that feeds on vertebrate cadavers, was investigated. These larvae require high heat incomes to develop, and can elevate temperatures by forming large aggregates. We hypothesized that L. sericata larvae should continue to feed at temperatures up to 38 ℃, which can be reached inside larval masses. Thermal regulation behavior such as movement between a hot food spot and colder areas was also postulated. The hypotheses were tested by tracking for 1 h the activity of single, starved third instar larvae in a Petri dish containing 1 food spot （FS） that was heated to a constant temperature of 25 ℃, 34 ℃ or 38 ℃ with an ambient temperature of 25 ℃. The influence of previous conspecific activity in the food on larval behavior was also tested. The crops of larvae were dissected to monitor food content in the digestive systems. Based on relative crop measurements, larvae fed at all food temperatures, but temperature strongly affected larval behavior and kinematics. The total time spent by larvae in FS and the duration of each stay decreased at high FS temperature. Previous activity of conspecifics in the food slightly increased the time spent by larvae in FS and also decreased the average distance to FS. Therefore, necrophagous L. sericata larvae likely thermoregulate during normal feeding activities by adjusting to local fluctuations in temperature, particularly inside maggot masses. By maintaining a steady internal body temperature, larvae likely reduce their development time.

关键词： blowflies Calliphoridae forensic entomology foraging thermoregulation video tracking

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Smart technology applications for the optimal management of underground facilities

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Underground Space 2021年第5期6卷 551-559页

作者： Isam Shahrour Hanbing Bian Xiongyao Xie Zixin Zhang School of Civil Engineering Tongji UniversityShanghai 200092China Laboratoire de Genie Civil et geo-Environnement Universite de LilleLille 59000France

This study centers on the use of smart technology to improve the lifecycle management of underground *** presents a comprehensive digital solution that addresses the challenges of underground facilities,particularly those related to the extensive use of underground space,as well as the requirements for safety,sustainability,and quality of *** proposed solution emerged from discussions with experts,companies,and cities involved in the design,construction,and management of underground *** this paper,we first discuss the major challenges of underground facilities,then,we present the development of a smart solution to address these *** study demonstrates a promising perspective for the use of smart technology in the optimal management of underground facilities,and paves the way for its implementation.

关键词： Artificial intelligence Lifecycle Safety Smart city Maintenance Smart technology Underground facilities

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Investigation of the fluid flow in an isolated rotor-stator system with a peripheral opening

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Science China(Physics,Mechanics & Astronomy) 2013年第4期56卷 745-754页

作者： DEBUCHY Roger ABDEL NOUR Fadi NAJI Hassane BOIS Gérard Laboratoire Génie Civil & géo-Environnement (LGCgE- EA 4515) UArtois/FSA Béthune F-62400 Béthune France université lille Nord de France F-59000 Lille France Damascus university Department of Water Engineering Damascus Syria LML-PRES lille Nord de France Arts et Métiers ParisTech Lille France

This paper deals with an experimental, theoretical and numerical study of a turbulent flow with separated boundary layers between a rotor and a stator. The system is not subjected to any superimposed radial flow. The periphery of the cavity is opened to the atmosphere so that the solid body rotation for infinite discs is not always observed. Emphasis was placed on develop- ment of an asymptotic approach and a step-by-step method to compute the radial distribution of the core swirl ratio and the static pressure on the stator side. The theory also includes the radial and axial velocities in the core region. The numerical simulation has been conducted with the commercial CFD code Fluent 6.1. The k- SST turbulence model is used, with the assumption of 2D-axisymmetric and steady flow. CFD validations have been performed by comparison of the numerical results with the corresponding theoretical results. Numerical and experimental results are in good agreement with analytical solutions.

关键词： rotor-stator cavity analytical solution numerical simulations k- SST turbulence model

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The Effect of Different Freeze-Thaw Cycles on Mortar Gas Permeability and Pore Structure

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1623-1636页

作者： Wei Chen Ao Xu Hejun Zhang Mingquan Sheng Yue Liang Frederic Skoczylas School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhanChina CNRS Centrale LilleUMR9013-LaMcube-Laboratoire de Mécanique Multiphysique et MultiéchelleUniversitéde LilleLilleFrance

Two different freeze-thaw cycles(FTC)are considered in this study to assess the related impact on gas permeability and micro-pore structure of a *** are the water-freezing/water-thawing(WF-WT)and the air-freezing/air-thawing(AF-AT)*** problem is addressed experimentally through an advanced nuclear magnetic resonance(NMR)technique able to provide meaningful information on the relationships among gas permeability,pore structure,mechanical properties,and the number of *** is shown that the mortar gas permeability increases with the number of FTCs,the increase factor being 20 and 12.83 after 40 cycles for the WF-WT and AF-AT,*** results also confirm that gas permeability hysteresis phenomena occur during the confining pressure loading and unloading process.

关键词： Mortar freeze-thaw cycles gas permeability pore structure NMR mechanical properties

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A frequency and velocity-dependent impedance method for prediction of rail/foundation dynamics

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Earthquake Engineering and Engineering Vibration 2021年第1期20卷 101-111页

作者： Reda Mezeh Marwan Sadek Fadi Hage Chehade Isam Shahrour Laboratory of Civil Engineering and GeoEnvironment University of LilleSciences and TechnologiesPolytech’LilleVilleneuve d’AscqHauts-de-France 59655France Doctoral School of Science and Technology Lebanese UniversityBeirut 0000Lebanon

This paper presents an efficient numerical tool for the prediction of railway dynamic response.A behavior calibration of the infinite Euler-Bernoulli beam resting on continuous viscoelastic foundation is *** laws of the discrete elements are determined for a rectilinear ballasted track.A three-dimensional model coupled with an adaptive meshing scheme is employed to calibrate the beam model impedances by finding the similarity between the output signals using the genetic *** model shows an important performance with significant reduction in computational *** study emphasizes the major impact of the excitation characteristics on the parameters of the discrete models.

关键词： moving loads rail vibrations rail/foundation interaction dynamic impedances genetic algorithm

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The floristic relationship between the upland and lowland Carboniferous wetlands of Variscan Euramerica——Evidence from some medullosalean pteridosperm fronds

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Journal of Palaeogeography 2019年第2期8卷 130-141页

作者： Christopher J.Cleal Borja Cascales-Mi?ana Department of Natural Sciences National Museum Wales CNRS University of Lille

Alethopteris grandinii represents remains of fronds of a medullosalean pteridosperm(probably a small tree) that rapidly migrated across the lowland wetland habitats of Variscan Euramerica in middle Asturian(late Moscovian)*** was probably caused by changing drainage patterns within the lowland coal swamps,in response to climate and landscape ***,these medullosaleans had first appeared rather earlier,in early Bolsovian(early Moscovian) times,in upland wetland *** upland habitats may have pre-adapted these plants to the changed condition in the lowland coal swamps.

关键词： Carboniferous Coal swamps Medullosales Upland Migration

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Experimental Study of Thermal-Hydraulic-Mechanical Coupling Behavior of High-Performance Concrete

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Fluid Dynamics & Materials Processing 2023年第9期19卷 2417-2430页

作者： Wei Chen Wenhao Zhao Yue Liang Frederic Skoczylas School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China CNRS Centrale LilleUMR9013-LaMcube-Laboratoire de Mécanique Multiphysique et MultiéchelleUniversitéde LilleLilleF-59000France

The design of an underground nuclear waste disposal requires a full characterization of concrete under various thermo-hydro-mechanical-chemical *** experimental work studied the characterization of coupled thermo-hydro-mechanical effects using concretes made with cement CEM I or CEM V/A(according to European norms).Uniaxial and triaxial compression under 5 MPa conﬁning pressure tests were performed under three dif-ferent temperatures(T=20℃,50℃,and 80℃).The two concretes were dried under relative humidity(RH)to obtain a partially saturated state of approximately 70%.The results showed that the effects of water saturation and conﬁning pressure are more important than that of *** in high RH at different target tempera-tures led to an increase in uniaxial and triaxial strength but drying at 105℃ had a negative effect on the strength and Young’s *** drying caused microcracking in the *** microcracks deeply inﬂuenced the thermal damage to the material,affecting its mechanical *** triaxial strength clearly increased due to the presence of conﬁning ***,an important inﬂuence of cement type was observed on the mechanical properties;the concrete based on CEM V/A had a greater porosity than CEM I,and aﬁner pore struc-ture appeared due to the presence of mineral admixtures.

关键词： Concrete temperature saturation uniaxial compression triaxial compression

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Precipitation strengthening of nano-scale TiC in a duplex low-density steel under near-rapid solidification

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Journal of Iron and Steel Research International 2021年第9期28卷 1141-1148页

作者： Jian-lei Zhang Cong-hui Hu Yu-xiang Liu Yang Yang Gang Ji Chang-jiang Song Qi-jie Zhai Center for Advanced Solidification Technology(CAST) State Key Laboratory of Advanced Special SteelSchool of Materials Science and EngineeringShanghai UniversityShanghai200444China UMR 8207-UMET-UnitéMatériaux et Transformations University of LilleFrench National Centre for Scientific Research(CNRS)French National Institute for Agricultural(INRAE)Centrale Lille Institute59000LilleFrance

Precipitation strengthening of nano-scale TiC is a promising method to improve mechanical properties of Fe–16Mn–9Al–0.8C (wt.%) low-density steel. This work attempted to introduce nano-scale TiC precipitates by adding 1 wt.% Ti element. The experimental results show that these precipitates with the total fraction of about 2 vol.% were formed and no coarse precipitates were observed despite the high Ti addition. It was interesting that the polygonal and needle-shaped TiC precipitates were observed in γ-austenite and δ-ferrite, respectively. Ti addition also decreased the volume fraction of γ-austenite significantly. Correspondingly, the yield strength was increased, but the elongation was significantly decreased due to the significant decrease of γ-austenite. Comparing with the Ti-free steel, the formation of TiC precipitates was the main reason for the increase in yield strength of Ti-bearing steel, and TiC precipitates also led to a higher strain hardening index at the first deformation stage. TiC precipitates promoted the Orowan strengthening, resulting in a higher strain hardening capability than Ti-free steel reinforced by shearable κ-carbide.

关键词： Precipitation strengthening Nano-scale TiC precipitate Low-density steel Yield strength Strain hardening

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Toward Energy-Efficient and Trustworthy eHealth Monitoring System

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China Communications 2015年第1期12卷 46-65页

作者： Ajmal Sawand Soufiene Djahel Zonghua Zhang Farid Na?t-Abdesselam Paris Descartes university university College Dublin TELECOM lille

The rapid technological convergence between Internet of Things （loT）, Wireless Body Area Networks （WBANs） and cloud computing has made e-healthcare emerge as a promising application domain, which has significant potential to improve the quality of medical care. In particular, patient-centric health monitoring plays a vital role in e-healthcare service, involving a set of important operations ranging from medical data collection and aggregation, data transmission and segregation, to data analytics. This survey paper firstly presents an architectural framework to describe the entire monitoring life cycle and highlight the essential service components. More detailed discussions are then devoted to {／em data collection} at patient side, which we argue that it serves as fundamental basis in achieving robust, efficient, and secure health monitoring. Subsequently, a profound discussion of the security threats targeting eHealth monitoring systems is presented, and the major limitations of the existing solutions are analyzed and extensively discussed. Finally, a set of design challenges is identified in order to achieve high quality and secure patient-centric monitoring schemes, along with some potential solutions.

关键词： eHealthcare wireless body area networks cyber physical systems mobile crowd sensing security privacy by design trust.

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