检索结果-南通市图书馆

Earthquake Engineering and Engineering Vibration 2013年第4期12卷 643-658页

作者： matthieu Perrault Philippe Gueguen Alexandru Aldea Sorin Demetriu Institut des Sciences de la Terre Université Joseph Fourier Grenoble ICNRS/IFSTTAR Technical University of Civil Engineering

The lack of knowledge concerning modelling existing buildings leads to significant variability in fragility curves for single or grouped existing buildings. This study aims to investigate the uncertainties of fragility curves, with special consideration of the single-building sigma. Experimental data and simplified models are applied to the BRD tower in Bucharest, Romania, a RC building with permanent instrumentation. A three-step methodology is applied：（1） adjustment of a linear MDOF model for experimental modal analysis using a Timoshenko beam model and based on Anderson＇s criteria, （2） computation of the structure＇s response to a large set of accelerograms simulated by SIMQKE software, considering twelve ground motion parameters as intensity measurements （IM）, and （3） construction of the fragility curves by comparing numerical interstory drift with the threshold criteria provided by the Hazus methodology for the slight damage state. By introducing experimental data into the model, uncertainty is reduced to 0.02 considering Sd ） as seismic intensity IM and uncertainty related to the model is assessed at 0.03. These values must be compared with the total uncertainty value of around 0.7 provided by the Hazus methodology.

关键词： vulnerability fragility curves uncertainty slight damage Timoshenko model Bucharest

How to derive a geovisualization from an application data model: an approach based on Semantic Web technologies

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2021年第7期14卷 874-898页

作者： matthieu Viry Marlène Villanova-Oliver Univ.Grenoble Alpes CNRSGrenoble INP(Institute of Engineering Univ.Grenoble Alpes)LIGGrenobleFrance

While ontological modelling and Semantic Web technologies are sometimes used to describe knowledge domains with a spatial component,there is still a lack of semantics to describe how to present this knowledge geovisually to the end user and how to automatize the *** this paper,we first present vocabularies to describe at a high level the elements that make up a *** then propose a method that describes at a semantic level how to obtain a geovisualization from an existing data *** method is based on our vocabularies and on a set of semantic rules encoding rich and complex operations on *** leads to the derivation of ontological knowledge,ready to be exploited to automate the creation of a *** method is implemented in a framework that uses Semantic Web *** singularity and the strength of our proposal is that it enables to describe a geovisualization through a RDF specification file,which once loaded in our system makes the geovisualization directly available for use from a Web *** result is obtained by extending a priori an application data model with ad hoc geovisualization semantics features and rules.

关键词： Knowledge representation Semantic Web geovisualization ontologies rule-based system

Femtosecond Laser-Induced Breakdown Spectroscopy for Detection of Trace Elements in Sophora Leaves

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2007年第12期24卷 3466-3468页

作者： Myriam Bossu 郝作强 matthieu Baudelet 俞进张喆张杰 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 Laboratoire de Spectrométrie Ionique et Moléculaire UMR CNRS 5579 Université Claude Bernard Lyon 1 43 Bd. du 11 Novembre 1918 F-69622 Villeurbanne Cedex France Department of Physics Shanghai Jiao Tong University Shanghai 200240

Sophora leaves from several areas in Beijing are analysed by femtosecond laser-induced breakdown spectroscopy （femto-LIBS）. Although the used spectral detection system is not time-resolved, the spectral lines of trace mineral elements are detected and analysed. It is proven that the femto-LIBS can be an efficient method to detect mineral trace elements contained in tree leaves which is a biomonitor for atmospheric pollution assessment or botanic studies. An interesting case of correlation between trace elements detected in tree leaves and the pollution of the concerned area is presented, for the first time to our knowledge.

关键词： thermoelectric half-Heusler compounds thermal conductivity

Income Mobility and Income Inequality in Rural China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Economics in China-Selected Publications from Chinese Universities 2016年第4期11卷 608-634页

作者： matthieu Clement GREThA Universite de Bordeaux 33608 Pessac Cedex France

The economic literature has argued for a long time that income mobility could attenuate the degree of cross-sectional inequality by offering people opportunities to improve their socio-economic position. Using the longitudinal data from the China Health and Nutrition Survey （CHNS） from 1989 to 2011, we measure income mobility as the degree to which longer-term incomes are distributed more or less equally than yearly income. Five main results are emphasized. First, there is strong income mobility in rural China that partly offsets yearly income inequality. Second, income mobility has decreased since the 2000s, indicating that income distribution is becoming more rigid. Third, mobility is mainly associated with transitory income fluctuations, particularly in the two tails of the distribution. Fourth, income mobility has an equalizing effect on income distribution. Fifth, we show that non-agricultural income mobility has substantially increased over the period and that its equalizing nature has also recently increased. While the development of the non-agriculture sector in rural China was a crucial factor in explaining the increase in rural inequality until the mid-2000s, we suggest that the large-scale generalisation of such non-agricultural opportunities partly accounts for the decline in rural inequality observed since the mid-2000s.

关键词： income inequality income mobility rural areas China

Activity Enhancement of MgCl2-supported Ziegler-Natta Catalysts by Lewis-acid Pre-treatment for Ethylene Polymerization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2019年第10期37卷 1031-1038,I0006页

作者： matthieu Humbert Sébastien Norsic Jean Raynaud Vincent Monteil UMR 5265 Laboratoire de Chimie Catalyse Polymères et Procédés (C2P2) Université de Lyon

Ziegler-Natta precatalysts were synthetized from Lewis-base-modified-MgCl2 supports and treated by various Lewis acids,prior to activation by triethylaluminum, in order to increase their activity in ethylene polymerization. BCl3 provided the highest increase in activity. Interestingly, polymerization results showed no substantial modification of polymer properties, which is consistent with that Lewis acid only promotes the creation of new active sites, after activation by TEA, possessing very similar features to the original ones achievable with conventional precatalysts(i.e. without Lewis-acid treatment).

关键词： Ziegler-Natta catalysis Ethylene polymerization Heterogeneous catalysis Lewis acids

Observation of supersymmetric pseudo-Landau levels in strained microwave graphene

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 611-617页

作者： matthieu Bellec Charles Poli Ulrich Kuhl Fabrice Mortessagne Henning Schomerus Institut de Physique de Nice(INPHYNI) Universite Cote d’AzurCNRS06108 NiceFrance Department of Physics Lancaster UniversityLancaster LA14YBUK

Using an array of coupled microwave resonators arranged in a deformed honeycomb lattice,we experimentally observe the formation of pseudo-Landau levels in the whole crossover from vanishing to large pseudomagnetic field *** result is achieved by utilising an adaptable setup in a geometry that is compatible with the pseudo-Landau levels at all field *** adopted approach enables us to observe the fully formed flat-band pseudo-Landau levels spectrally as sharp peaks in the photonic density of states and image the associated wavefunctions spatially,where we provide clear evidence for a characteristic nodal structure reflecting the previously elusive supersymmetry in the underlying low-energy *** particular,we resolve the full sublattice polarisation of the anomalous 0th pseudo-Landau level,which reveals a deep connection to zigzag edge states in the unstrained case.

关键词： microwave strained Landau

Growth and nutrient accumulation of Brazil nut trees(Bertholletia excelsa) in agroforestry at different fertilizer levels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2015年第2期26卷 347-353页

作者： gotz Schroth Maria do Socorro Souza da Mota Maria Elizabeth de Assis Elias C.P. 513 Santarem PA 68109-971 Brazil Centro de Estudos Avanqados de Promoqao Social e Ambiental Av. Mendonqa Furtado 3979 Santarem PA 68040-050 Brazil Universidade Federal do Amazonas Manaus AM 69077-000Brazil

The Brazil nut tree（Bertholletia excelsa） is a frequent component of agroforestry systems in the Amazon because of its adaptation to nutrient-poor upland soils and multiple *** investigated the aboveground biomass production（kg dry weight）,nutrient uptake and requirements（N,P,Ca,Mg,K） of Brazil nut trees of different sizes grown under agroforestry conditions and fertilized at different *** of 70 experimental trees with different size were harvested and stem,branches and leaves were *** contents were determined for three trees of varying *** tree growth was fast,but variability was high,suggesting considerable potential for the improvement of this economically important *** trees responded to increased levels of fertilizer and lime with significantly increased foliar nutrient contents and growth,probably because of the improved availability of Mg and Ca for which the species seems to have a relatively high *** contrast to Brazil nut trees grown in forest or dense plantations,the agroforestry trees invested a substantial part of their biomass and nutrients in large branches and developed spreading *** improve stem form,reduce competition with associated crops for light and recycle nutrients,regular pruning of lower branches or planting arrangements that favor self-pruning are *** measures would also increase the recycling of Ca and Mg,large quantities of which are contained in the branches.

关键词： Allometric equation Amazon Nutrient competition Nutrient recycling Plant mineral nutrition Soil fertility Silviculture

Lifting the veil on the keratinocyte contribution to cutaneous nociception

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2020年第4期11卷 239-250页

作者： matthieu Talagas Nicolas Lebonvallet Francois Berthod Laurent Misery Univ Brest LIEN29200 BrestFrance Laboratoire d'Organogenese Experimentale(LOEX) University of LavalQuebecCanada Department of Dermatology Brest University HospitalBrestFrance Univ Brest BSAM(Institut Brestois de Sante Agro matiere)29200 BrestFrance

Cutaneous nociception is essential to prevent individuals from sustaining *** to the conventional point of view,the responses to noxious stimuli are thought to be exclusively initiated by sensory neurons,whose activity would be at most modulated by *** recent studies have demonstrated that epidermal keratinocytes can also act as primary nociceptive transducers as a supplement to sensory *** enlighten our understanding of cutaneous nociception,this review highlights recent and relevant findings on the cellular and molecular elements that underlie the contribution of epidermal keratinocytes as nociceptive modulators and noxious sensors,both under healthy and pathological conditions.

关键词： keratinocyte nociception skin TRP pain inflammation

Time-dependent behaviour of the Callovo-Oxfordian claystone-concrete interface

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2020年第1期12卷 89-101页

作者： Eleni Stavropoulou matthieu Briffaut Frédéric Dufour Guillaume Camps Univ.Grenoble Alpes CNRSGrenoble INP3SRF-38000GrenobleFrance Agence Nationale pour la gestion des Déchets Radioactifs(Andra) Chatenay-MalabryFrance

In the context of the Cigeo project,the French National Radioactive Waste Management Agency(Andra)is studying the behaviour of a deep geological facility for radioactive waste deposit in the CallovoOxfordian(COx)*** assessment of durability of this project requires the prediction of irreversible strain over a large time *** mechanical interaction of the host rock and the concrete support of tunnels must be investigated to ensure the long-term sustainability of the *** instantaneous and time-dependent behaviour of the claystone-concrete interface is experimentally investigated with direct shear tests and long-duration shear tests of a few *** mechanical and structural state of the claystone which is affected after interaction with concrete reflects to the response of the claystone-concrete interface,and thus different types of COx claystone-concrete interfaces are *** delayed deformation of the interface is found to be linked to the level of the normal loading and the loading history while a different response of the interface was observed from the short-and long-duration tests,indicating a possible progressive modification of interface under long-duration loadings.

关键词： Callovo-Oxfordian(COx)claystone Interfaces Time-dependent behaviour

On the Liquid-Vapor Phase-Change Interface Conditions for Numerical Simulation of Violent Separated Flows

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2020年第2期16卷 359-381页

作者： matthieu Ancellin Laurent Brosset Jean-Michel Ghidaglia UniversitéParis-Saclay ENS Paris-SaclayCNRSCentre BorelliGif-sur-YvetteFrance GTT(Gaztransport&Technigaz) Saint-Rémy-lès-ChevreuseFrance

Numerous models have been proposed in the literature to include phase change into numerical simulations of two-phase *** review paper presents the modeling options that have been taken in order to obtain a model for violent separated flows with application to sloshing wave impacts.A relaxation model based on linear non-equilibrium thermodynamics has been chosen to compute the rate of phase *** integration in the system of partial differential equations is done through a non-conservative advection *** each of these modelling choices,some alternative models from the literature are presented and *** theoretical framework for all phase change model(conservation equations and entropy growth)is also summarized.

关键词： Phase change modeling two-phase flow non-equilibrium thermodynamics compressible flow hyperbolic system of conservation laws