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Impact of a Phosphate Amendment on the Environmental Availability and Phytoavailability of Cd and Pb in Moderately and Highly Carbonated Kitchen Garden Soils

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Pedosphere 2017年第3期27卷 588-605页

作者： Christophe WATERLOT Christelle PRUVOT franck marot Francis DOUAY Yncréa Hauts-de-France Laboratoire Génie Civil et géo Environnement (LGCgE) Agence De l’Environnement et de la Matrise de l’Energie (ADEME) Direction Villes et Territoires Durables Services Friches Urbaines et Sites Pollués

The behaviour of metals mainly depends on soil p H, carbonate contents and contamination level, which should be considered for the management of contaminated soils. In this study, kitchen garden topsoils(0–25 cm) were sampled from the area around three smelters in France, with different Cd and Pb contamination levels. Effect of a phosphate amendment(a mixture of diammonium phosphate and hydroxyapatite) on the environmental availability and phytoavailability of Cd and Pb was evaluated by different chemical extractions and cultivating lettuce(Lactuca sativa L.), respectively. Changes in the distribution of Cd and Pb were found in most contaminated soils after phosphate amendment. An increase of Cd and Pb in the residual phase was highlighted in almost all carbonated contaminated soils, whereas a decrease of Pb in the exchangeable, water and acid-soluble phase was observed in most contaminated soils with the lowest carbonate contents. The concentrations of extractable Cd and Pb using calcium chloride and acetic and citric acids generally decreased after the soil amendment. Lettuces grown on amended soils were acceptable for human consumption as regard to Pb concentration. In contrast, some lettuces were unacceptable for human consumption, since the concentrations of Cd in the leaves were higher than the European legislation limit. Surprisingly, in carbonated soils with very low concentration of Cd, the Cd concentrations in lettuce reached up to the European legislation limit, making the lettuce unacceptable for human *** study highlighted the fact that the total metal concentration in soils does not always allow to predict the metal accumulation in the edible parts of vegetables in order to make a judgement about their acceptability or unacceptability for human consumption.

关键词： chemical amendment contamination immobilisation lettuce metal urban soil

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Dynamics of a rigid body in a two-dimensional incompressible perfect fluid and the zero-radius limit Dedicated to Professor Jean-Yves Chemin on the Occasion of His 60th Birthday

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Science China Mathematics 2019年第6期62卷 1205-1218页

作者： franck Sueur Institut de Mathématiques de Bordeaux CNRS UMR 5251 Université de Bordeaux

In this survey we report some recent results on the dynamics of a rigid body immersed in a twodimensional incompressible perfect fluid, with an emphasis on the zero-radius limit.

关键词： fluid-structure interaction point vortex perfect incompressible fluid

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Determination of trace PAHs in seawater and sediment pore-water by solid-phase microextraction (SPME) coupled with GC/MS

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Science China Chemistry 2006年第6期49卷 481-491页

作者： Lee franck Sen-Chun Material Transport & Transformation in Environmental & Life Processes Lab First Institute of Oceanography State Oceanic Administration

A fast and reliable method for the determination of trace PAHs (polynuclear aromatic hydrocarbons) in seawater by solid-phase microextraction (SPME) followed by gas chromatographic (GC) analysis has been developed. The SPME operational parameters have been optimized, and the effects of salinity and dissolved organic matter (DOM) on PAHs recoveries have been investigated. SPME measures only the portion of PAHs which are water soluble, and can be used to quantify PAH partition coefficient between water and DOM phases. The detection limits of the overall method for the measurement of sixteen PAHs range from 0.1 to 3.5 ng/g, and the precisions of individual PAH measurements range from 4% to 23% RSD. The average recovery for PAHs is 88.2±20.4%. The method has been applied to the determination of PAHs in seawater and sediment porewater samples collected in Jiaozhou Bay and Laizhou Bay in Shandong Peninsula, China. The overall levels of PAHs in these samples reflect moderate pollution compared to seawater samples reported elsewhere. The PAH distribution pattern shows that the soluble PAHs in seawater and porewater samples are dominated by naphthalenes and 3 ring PAHs. This is in direct contrast to those of the sediment samples reported earlier, in which both light and heavy PAHs are present at comparable concentrations. The absence of heavy PAHs in soluble forms (<0.1-3.5 ng/L) is indicative of the strong binding of these PAHs to the dissolved or solid matters and their low seawater solubility.

关键词： solid-phase microextraction, polycyclic aromatic hydrocarbons, dissolved organic matter, marine sediment porewater, PAH-DOM complex.

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Biomimetic Autopilot Based on Minimalistic Motion Vision for Navigating along Corridors Comprising U-shaped and S-shaped Turns

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Journal of Bionic Engineering 2015年第1期12卷 47-60页

作者： Julien R. Serres franck Ruffier Aix-Marseille UniversitY CNRS ISM UMR 7287 Biorobotics Lab 13288 Marseille Cedex 09 France

A bioinspired autopilot is presented, in which body saccadic and intersaceadic systems are combined. This autopilot en- ables a simulated hovercraft to travel along corridors comprising L-junctions, U-shaped and S-shaped turns, relying on mini- realistic motion vision cues alone without measuring its speed or distance from walls, in much the same way as flies and bees manage their flight in similar situations. The saccadic system responsible for avoiding frontal collisions triggers yawing body saccades with appropriately quantified angles based simply on a few local optic flow measurements, giving the angle of inci- dence with respect to a frontal wall. The simulated robot negotiates stiff bends by triggering body saccades to realign its tra- jectory, thus traveling parallel with the wall along a corridor comprising sharp turns. Direct comparison shows that the per- formance of this new body saccade-based autopilot closely resembles the behavior of a fly using similar body saccade strategy when flying along a corridor with an S-shaped turn, despite the huge differences in terms of the inertia.

关键词： optic flow collision avoidance body saccades insect flight biorobotics biomimetics

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Observations of contrasted glacial-interglacial dissolution of foraminifera above the lysocline in the Bay of Bengal,northeastern Indian Ocean

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Acta Oceanologica Sinica 2021年第1期40卷 155-161页

作者： Duo Wang Xuan Ding franck Bassinot School of Ocean Sciences China University of Geosciences(Beijing)Beijing 100083China Laboratoire des Sciences du Climat et de l’Environnement National Agency for Nuclear Energy/National Centre for Scientifique Research/University of Versailles-Saint QuentinGif-sur-Yvette 91198France

Site U1446(19°50’N,85°44’E,at water depth 1430 m)was drilled during Expedition 353(Indian monsoon rainfall)of the International Ocean Discovery Program(IODP).It is located in the Mahanadi offshore basin,on the northern Bay of *** rates and contents of biocarbonates are high at this relatively shallow *** a micropaleontological approach,we examined planktonic and benthic foraminifera in the upper around 40 m of this site,spanning the last around 190 ka.A striking feature of the foraminiferal record is the occurrence of strong but varying dissolution although the site is located well above the modern *** strong dissolution has never been reported in this *** estimated the flux of foraminifera and quantified the ratio of benthic foraminifera over total foraminifera(benthic/total foraminifera)along with the foraminifer fragmentation index in order to characterize past changes in this above-lysocline *** study reveals a clear glacialinterglacial contrast,with a stronger dissolution during marine isotope stages(MISs)1 and 5 than during MISs 2–4 and *** a difference in preservation is likely to have a strong impact on geochemical proxies measured on *** new observations call for an in-depth study of the causes of such above-lysocline dissolution in the region,and an evaluation of its impact on the foraminifera-based proxies used for paleoenvironmental reconstruction.

关键词： foraminifera dissolution lysocline glacial-interglacial Bay of Bengal

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Effect of Bifidobacterium longum 35624 on disease severity and quality of life in patients with irritable bowel syndrome

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World Journal of Gastroenterology 2022年第7期28卷 732-744页

作者： Jean-Marc Sabaté franck Iglicki Department of Gastroenterology Hôpital AvicenneAP-HPSorbonne Paris NordBobigny 93000France INSERM U-987 Pathophysiology and Clinical Pharmacology of PainAmbroise ParéHospitalBoulogne-Billancourt 92100France allée Léon Gambetta Clichy 92110France

BACKGROUND Bifidobacterium longum 35624 has shown efficacy in improving irritable bowel syndrome(IBS)symptoms compared with placebo in double-blind randomized ***,few data are available from real-life clinical practice or from studies that used Rome IV criteria to diagnose *** To assess the effect of *** 35624 on IBS severity and quality of life in a reallife *** From November 2018 to January 2020,278 patients with IBS(according to Rome IV criteria)were enrolled in a prospective,open-label,multicenter observational study by private practice gastroenterologists to received one capsule of *** 35624(10^(9) colony-forming units)per day for 30 *** in the study was independently proposed to patients during spontaneous *** severity(assessed by the IBS severity scoring system)and patient quality of life(assessed by the IBS quality of life questionnaire)were compared between the inclusion visit(baseline)and the visit at the end of 30 d of *** characteristics of patients were described at *** variables comparisons between inclusion and end-of-treatment visits were performed using the t-test and Kruskal-Wallis *** variables comparisons were performed using theχ^(2) *** total of 233 patients,with a mean age of 51.4 years and composed of 71.2%women,were included in the *** these patients,48.1%had moderate IBS and 46.4%had severe *** a 30-d treatment period with one *** 35624 capsule per day,a significant decrease in IBS severity was observed compared to baseline(mean±SD,IBS severity scoring system scores:208±104 vs 303±81,P<0.001)and 57%of patients moved to lower severity categories or achieved *** quality of life of patients was also improved by the treatment(IBS Quality of Life questionnaire score:68.8±20.9 vs 60.2±20.5;P<0.001)and 63.8%of patients were satisfied with the *** Thirty days of treatment with *** 35624

关键词： Irritable bowel syndrome Probiotics Bifidobacterium longum Quality of life Severity of illness index Abdominal pain

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Interruption limits of mechanical circuit breakers and circuit upgrades for current injection in HVDC circuit breakers

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High Voltage 2020年第3期5卷 334-342页

作者： Tim Schultz Patrik Herzog Christian Michael franck High Voltage Laboratory ETH ZurichPhysikstrasse 38092 ZurichSwitzerland

Current injection circuit breakers consist of a mechanical interrupter(MI)with a current injection and an energy dissipation branch in *** performance of the complete device is largely determined by mechanical operation time and interruption performance of the *** the standard configuration,current injection is realised using a pre-charged inductor–capacitor circuit.A higher interruption performance of the MI makes it possible to scale down the resonant injection circuit,and thus have a more economical ***,the implementation of more complex injection circuits that quickly create zero crossings,while maintaining favourable conditions for interruption,can lead to economic *** this study,the interruption performance of a model gas interrupter as part of a current injection topology is *** results are used to verify a corresponding simulation model and two-dimensional upgrade circuits that influence the injection current to increase the range of interruptible fault *** the basis of experimental results,the simulation model is used to investigate the performance of upgrade circuits for the use in high-voltage direct current(HVDC)*** results indicate that using improved injection circuits can considerably increase the economic advantage of current injection circuit breakers compared with other topologies.

关键词： injection resonant branch

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On the Simpson index for the Wright–Fisher process with random selection and immigration

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International Journal of Biomathematics 2020年第6期13卷 77-111页

作者： Arnaud Guillin franck Jabot Arnaud Personne Laboratoire d'Ingdnierie pour les Systemes Complexes IRSTEA Campus des Cezeaux 9 avenue Blaise Pascal-CS *** AubiereFrance

Moran or Wright–Fisher processes are probably the most well known models to study the evolution of a population under environmental various *** object of study will be the Simpson index which measures the level of diversity of the population,one of the key parameters for ecologists who study for example,forest *** ecological motivations,we will consider,here,the case,where there are various species with fitness and immigration parameters being random processes(and thus time evolving).The Simpson index is difficult to evaluate when the population is large,except in the neutral(no selection)case,because it has no closed *** approach relies on the large population limit in the“weak”selection case,and thus to give a procedure which enables us to approximate,with controlled rate,the expectation of the Simpson index at fixed *** will also study the long time behavior(invariant measure and convergence speed towards equilibrium)of the Wright–Fisher process in a simplified setting,allowing us to get a full picture for the approximation of the expectation of the Simpson index.

关键词： Simpson index multidimensional Wright-Fisher process random selection random immigration moment’s closure

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Inter- and intraspecific variability of plant individual growth and its role on species ranking in grasslands

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Journal of Plant Ecology 2020年第3期13卷 378-386页

作者： Rémi Perronne franck Jabot Julien Pottier UCA INRAEVetAgro SupUMR Ecosystème Prairialsite de Crouel5 chemin de BeaulieuF-63000 Clermont-FerrandFrance UCA INRAEUR LISCCentre de Clermont-Ferrand9 avenue Blaise PascalF-63178 AubièreFrance

Aims Individual growth constitutes a major component of individual ***,measuring growth rates of herbaceous plants non-destructively at the individual level is notoriously *** study,based on an accurate non-destructive method of aboveground biomass estimation,aims to assess individual relative growth rates(RGRs)of some species,identify its environmental drivers and test its consequences on community *** specifically address three questions:(i)to what extent environmental conditions explain differences in individual plant growth between sites,(ii)what is the magnitude of intraspecific variability of plant individual growth within and between sites and(iii)do species-averaged(dis-)advantage of individual growth compared with the whole vegetation within a site correlate with species ranking at the community level?Methods We monitored the growth of individuals of four common perennial species in 18 permanent grasslands chosen along a large pedoclimatic gradient located in the Massif Central,*** measured soil properties,levels of resources and meteorological parameters to characterize environmental conditions at the site *** design enables us to assess the influence of environmental conditions on individual growth and the relative extent of inter-individual variability of growth explained within and between *** determined the ranking of each of the four species in each site with botanical surveys to assess the relationship between species-averaged growth(dis-)advantage relative to the whole community and species rank in the *** Findings We found that environmental conditions explain a significant proportion of individual growth variability,and that this proportion is strongly variable between *** availability was the main driver of plant growth,followed by rainfall amount and potential evapotranspiration,while soil properties had only a slight *** further highlighted a moderate to high wit

关键词： relative growth rate species ranking non-destructive biomass estimation temperate permanent grasslands inter-individual variability

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Influence of humidity on conduction processes in gas-insulated devices

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High Voltage 2020年第2期5卷 143-150页

作者： Malte Tschentscher David Graber Christian M.franck High Voltage Laboratory ETH Zurich8092 ZurichSwitzerland

Humidity has been considered as one of the main influencing factors that determine the conduction processes and electric strength of gas-insulated *** in the past,various studies focused on the change in the partial discharge inception voltages,breakdown strength of homogeneous and inhomogeneous field arrangements,and insulator flashover voltage,recent studies have investigated the changes in ion currents measured through different gas *** the framework of this contribution,a highly precise humidity control circuit has been developed to analyse the significance of humidity in the range from−25 to−5°C frost-point,which is fully applicable to operating gas-insulated *** sulphur hexafluoride(SF6)as the insulation gas at 0.45 MPa,Al2O3-filled epoxy resin insulators,and technically rough electrodes,the humidity was found to significantly influence the intensity of microdischarges at *** generation from microdischarges at the interfaces substantially increased with increasing *** an electric field of 5 kV/mm that were applicable to the dimensioning of gas-insulated devices,humidity strongly influences the charge provision from technically rough interfaces and potentially contributes to the surface-charge accumulation at insulator *** the other hand,for low-field conduction phenomena,no increase in the ion currents from natural ionisation or electrophoretic conduction was *** the investigated range of parameters,humidity is expected to be highly relevant for the design of gas-insulated devices.

关键词： conduction humidity sulphur

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