检索结果-南通市图书馆

Determining indoor air quality and identifying the origin of odour episodes in indoor environments

在线全文

学校读者我要写书评

暂无评论

Journal of environmental Sciences 2009年第3期21卷 333-339页

作者： eva Gallego xavier Roca Jose Francisco Perales xavier Guardino environmental Centre Laboratory Polytechnic University of Catalonia (LCMA-UPC) Avda Diagonal 647 E 08028 Barcelona Spain National Centre of Work Conditions (INSHT) Dulcet 2-10 E 08034 Barcelona Spain

A methodology for identifying volatile organic compounds （VOCs） and determining air quality of indoor air has been developed. The air samples are collected using pump samplers by the inhabitants when they perceive odorous and/or discomfort episodes. Glass multi-sorbent tubes are connected to the pump samplers for the retention of VOC. The analysis is performed by automatic thermal desorption （ATD） coupled with gas chromatography-mass spectrometry （GC/MS）. This methodology can be applied in cases of sick building syndrome （SBS） evaluation, in which building occupants experience a series of varied symptoms that appear to be linked to time spent in the building. Chemical pollutants concentrations （e.g., VOC） have been described to contribute to SBS. To exemplify the methodology, a qualitative determination and an evaluation of existing VOC were performed in a dwelling where the occupants experienced the SBS symptoms. Higher total VOC （TVOC） levels were detected during episodes in indoor air （1.33 ±1.53 mg/m^3） compared to outdoor air （0.71± 0.46 mg/m^3）. The concentrations of individual VOCs, such as ethanol, acetone, isopropanol, 1-butanol, acetic acid, acetonitrile and 1-methoxy-2-propanol, were also higher than the expected for a standard dwelling. The external source of VOC was found to be an undeclared activity of storage and manipulation of solvents located at the bottom of a contiguous building.

关键词： indoor air thermal desorption TVOC VOC sick building syndrome

Natural enemies depend on remnant habitat size in agricultural landscapes

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2015年第2期26卷 469-477页

作者： Mainara xavier Jordani erica Hasui Vinicius xavier da Silva Laboratorio de ecologia Animal Departamento de Zoologia e BotanicaUniversidade Estadual Paulista-UNESPRua Cristovao Colombo2265Jardim NazarethSao Jose Do Rio PretoSP CEP 15054-000Brazil Laboratorio de ecologia de Fragmentos do Sul de Minas Gerais-eCOFRAG Instituto Ciencias da NaturezaUniversidade Federal de Alfenas-UNIFAL–MGRua Gabriel Monteiro da Silva700CentroAlfenasMG CEP 37130-000Brazil

In recent decades,the consequences of habitat fragmentation have been of growing concern,because it is particularly important to understand how fragmentation may affect biodiversity,an ecological *** tested two hypotheses：（1） that natural fragment size in agricultural landscapes indirectly affects the herbivore through effects on natural predator populations;and（2） predator activity into the crop reduces along the distance from the natural fragment *** 2008 and 2009,we conducted our study in seven forest remnants and in surrounding coffee plantations（fragments ranged from 6 to 105 ha,mean 49.28 ± 36.60 ha） in Southern Minas Gerais,*** were sampled by point counts,and insect predation was evaluated by using an artificial insect model（Koh and Menge 2006）.Our results suggest that although there were many potential predators（e.g.,wasps,ants,birds,and mammals）,birds were the most important taxon *** covariance analysis supported the hypothesis that patch size affected the number of larvae predation by overall taxi,but there was no support for a distance *** findings suggest that natural enemies’ ecological service（mainly from birds） declined with remnant reduction,which has implications not only for human welfare,but also in strengthening the economic justifications for conserving the remaining natural habitats and biodiversity in agricultural landscapes.

关键词： ecosystem service Fragmentation Isolation Insectivore Predation

Quantum Transport Properties of Chemically Functionalized Long Semiconducting Carbon Nanotubes

在线全文

学校读者我要写书评

暂无评论

Nano Research 2010年第4期3卷 288-295页

作者： Alejandro Lopez-Bezanilla xavier Blase Stephan Roche Commissariat a l’energie Atomique 38054 Grenoble CedexFrance Institut Néel CNRS and UniversitéJoseph FourierB.P.16638042 Grenoble Cedex 09France CIN2(CSIC-ICN)Barcelona Campus UABE-08193 BellaterraSpain

We present a first-principles study of the electronic transport properties of micrometer long semiconducting carbon nanotubes randomly covered with carbene functional groups. Whereas prior studies suggested that metallic tubes are hardly affected by such addends, we show here that the conductance of semiconducting tubes with standard diameter is, on the contrary, severely damaged. The configurational-averaged conductance as a function of tube diameter, with a coverage of up to one hundred molecules, is extracted. Our results indicate that the search for a conductance-preserving covalent functionalization route remains a challenging issue.

关键词： Nanotubes functionalization carbene electronic transport

A GIS-based method for the selection of the location of residence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2012年第1期15卷 61-66页

作者： xavier ALBACeTe Kari PASANeN Mikko KOLeHMAINeN Department of environmental Science Research Group of Environmental InformaticsUniversity of Eastern FinlandYliopistoranta 1 EP.O.Box 162770211 KuopioFinland

Homebuyers are usually interested in both the accessibility of services and the quality of the local environment,and real estate agents frequently offer some web-based systems for home *** is however hardly any information about the quality of local living environment in those web-based *** purpose of this study was to develop a method for homebuyers,adaptable to the environmental variables of interest to homebuyers when selecting a home *** this paper,a multicriteria spatial analysis method is proposed and demonstrated for the homebuyers’selection process,using data from the City of Kuopio,*** spatial variables are applied,including environmental and service factors in the home searching process.A geographical information system(GIS)is used for creating maps for decision variables and mapping suitable *** method for ranking alternative dwellings is based on the difference between levels of the decision variables for each dwelling and the target levels given by the *** method presented in this paper is adaptable to other geographical and social *** decision analysis tool will be useful for both customers and real estate agents,and can also be used for city planning as a participatory-GIS(P-GIS)*** introduces new possibilities in the home selection *** availability of spatial data on the living environment in the webbased services for homebuyers is likely to have effects on customers’requirements and house markets,and also promote better spatial city organization in the long run.

关键词： home selection real estate market living environment GIS

Second-Kind Boundary Integral equations for Scattering at Composite Partly Impenetrable Objects

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2018年第1期23卷 264-295页

作者： xavier Claeys Ralf Hiptmair elke Spindler Sorbonne Universites UPMC Univ Paris 06CNRSINRIAUMR 7598Laboratoire Jacques-Louis Lionsequipe AlpinesF-75005ParisFrance Seminar for Applied Mathematics Swiss Federal Institute of TechnologyCH-8092 ZurichSwitzerland

We consider acoustic scattering of time-harmonic waves at objects composed of several homogeneous *** of those may be impenetrable,giving rise to Dirichlet boundary conditions on their *** start from the recent secondkind boundary integral approach of[***,and ***,and ***.A second-kind Galerkin boundary element method for scattering at composite *** Numerical Mathematics,55(1):33-57,2015]for pure transmission problems and extend it to settings with essential boundary *** on so-called global multipotentials,we derive variational second-kind boundary integral equations posed in L^(2)(S),where S denotes the union of material *** suppress spurious resonances,we introduce a combined-field version(CFIe)of our new *** numerical tests highlight the low andmesh-independent condition numbers of Galerkin matrices obtained with discontinuous piecewise polynomial boundary element *** also confirm competitive accuracy of the numerical solution in comparison with the widely used first-kind single-trace approach.

关键词： Acoustic scattering second-kind boundary integral equations Galerkin boundary element methods

efficient Numerical Computation of Time-Fractional Nonlinear Schrodinger equations in Unbounded Domain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2019年第1期25卷 218-243页

作者： Jiwei Zhang Dongfang Li xavier Antoine Beijing Computational Science Research Center Beijing 100193P.R.China School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan 430074China Institut elie Cartan de Lorraine UMR CNRS 7502Universit́e de LorraineInria Nancy-Grand EstSPHINX TeamF-54506 Vandoeuvre-l`es-Nancy CedexFrance

The aim of this paper is to derive a stable and efficient scheme for solving the one-dimensional time-fractional nonlinear Schrodinger equation set in an unbounded *** first derive absorbing boundary conditions for the fractional system by using the unified approach introduced in[47,48]and a linearization ***,the initial boundary-value problem for the fractional system with ABCs is discretized,a stability analysis is developed and the error estimate O(h^(2)+τ)is *** accel-erate the L1-scheme in time,a sum-of-exponentials approximation is introduced to speed-up the evaluation of the Caputo fractional *** resulting algorithm is highly efficient for long time ***,we end the paper by reporting some numerical simulations to validate the properties(accuracy and efficiency)of the derived scheme.

关键词： Time-fractional nonlinear Schrodinger equation absorbing boundary condition sta-bility analysis convergence analysis sum-of-exponentials approximation

Synthesis,structural study,thermal,optical properties and characterization of the new compound[C6H7N2O2]3TeCl5·2Cl

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 Chemical Letters 2017年第8期28卷 1773-1779页

作者： Dhaou Maraii Jordi Farjas xavier Fontrodona Mohamed Dammak Laboratoire de Chimie Inorganique Facultédes Sciences de SfaxUniversity of SfaxBP 11713000 SfaxTunisia University of Girona Campus MontiliviEdif.PIIE17071 GironaCataloniaSpain

The new organic-inorganic compound, [C_6H_7N_2O_2]_3TeCl_5·2Cl was synthesized and its structure was determined at room temperature in the triclinic system （P^-1） with the following parameters： a = 10.5330（11）？, b = 10.6663（11）？, c = 15.9751（16）？, α = 82.090（2）°, β = 71.193（2）°, γ = 68.284（2）°and Z = 2. The final cycle of refinement led to R = 0.057 and Rw = 0.149. The crystal structure was stabilized by an extensive network of N--H···Cl and non-classical C--H···Cl hydrogen bonds between the cation and the anionic group. Several thermal analysis techniques such as thermogravimetric analysis, differential scanning calorimetric analysis and evolved gas analysis were used. We used isoconversional kinetics methods to determine the kinetics parameters. We observe that the decomposition of [C_6H_7N_2O_2]_3TeCl_5·2Cl entails the formation hydrochloric acid of nitroaniline as volatiles. The infrared spectra were recorded in the4000–400 cm^（-1）frequency region. The Raman spectra were recorded in the external region of the anionic sublattice vibration 50–1500 cm^（-1）. The optical band gap was calculated from the UV-Vis absorbance spectra using classical Tauc relation which was found to be 3.12 and 3.67 eV.

关键词： Thermal analysis Kinetics parameters Structural analysis FTIR Raman Optical absorption

G protein-coupled receptor 37(GPR37) emerges as an important modulator of adenosinergic transmission in the striatum

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2019年第11期14卷 1912-1914页

作者： xavier Morato Rodrigo A. Cunha Francisco Ciruela Unitat de Farmacologia Departament Patologia i Terapeutica ExperimentalFacultat de MedicinaInstituto de Investigacion Biomedica de Bellvitge (IDIBELL)Universitat de BarcelonaL’Hospitalet de LlobregatBarcelonaSpainInstitut de NeurocienciesUniversitat de BarcelonaBarcelonaSpain (Morato X Ciruela F) Center for Neuroscience and Cell Biology (CNC)-Center for Neurosciences and Cell BiologyUniversity of CoimbraCoimbraPortugalFaculty of MedicineUniversity of CoimbraCoimbraPortugal

G protein-coupled receptor 37 (GPR37), also known as parkin associated endothelin-like (Pael) receptor, is an orphan G protein- coupled receptor, which suffers a defective parking ubiquitination in autosomal recessive Parkinson’s disease promoting its endoplasmic reticulum aggregation and stress, neurotoxicity and neuronal death (Takahashi and Imai, 2003). Interestingly, we have demonstrated previously that GPR37 heteromerizes with adenosine A2A receptor (A2AR) in the striatum (Morato et al., 2017;Sokolina et al., 2017).

关键词： G protein-coupled receptor 37(GPR37) important modulator adenosinergic transmission

Analysis of a Prototypical Multiscale Method Coupling Atomistic and Continuum Mechanics:the Convex Case

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2007年第2期23卷 209-216页

作者： xavier Blanc Claude Le Bris FrédéricLegoll Laboratoire J.L.-Lions Université Pierre et Marie CurieBoite courrier 187F-75252 ParisFrance CeRMICS ecole Nationale des Ponts et Chaussées 6 et 8 avenue Blaise PascalCité DescartesF-77455 Marne-la-Vallée and MICMACInria RocquencourtF-78153 Le ChesnayFrance CeRMICS ecole Nationale des Ponts et Chaussées 6 et 8 avenue Blaise PascalCité DescartesF-77455 Marne-la-Vallée and MICMACInria RocquencourtF-78153 Le ChesnayFrance EDF R & D1 avenue du Général de GaulleF-92140 ClamartFrance

In order to describe a solid which deforms smoothly in some region, but non smoothly in some other region, many multiscale methods have been recently proposed that aim at coupling an atomistic model （discrete mechanics） with a macroscopic model （continuum mechanics）. We provide here a theoretical basis for such a coupling in a one-dimensional setting, in the case of convex energy.

关键词： Multiscale methods variational problems continuum mechanics discrete mechanics