检索结果-南通市图书馆

Hyperbolic Conservation Laws on *** Error Estimate for Finite Volume Schemes

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2009年第7期25卷 1041-1066页

作者： philippe G.LeFLOCH Baver OKUTMUSTUR Wladimir NEVES Laboratoire Jacques-Louis Lions Centre National de la Recherche ScientifiqueUniversité de Paris 6 Instituto de Matemática Universidade Federal do Rio de Janeiro C.P. 68530Cidade Universitária 21945-970

Following Ben-Artzi and LeFloch, we consider nonlinear hyperbolic conservation laws posed on a Riemannian manifold, and we establish an L1-error estimate for a class of finite volume schemes allowing for the approximation of entropy solutions to the initial value problem. The error in the L1 norm is of order h1/4 at most, where h represents the maximal diameter of elements in the family of geodesic triangulations. The proof relies on a suitable generalization of Cockburn, Coquel, and LeFloch＇s theory which was originally developed in the Euclidian setting. We extend the arguments to curved manifolds, by taking into account the effects to the geometry and overcoming several new technical difficulties.

关键词： Hyperbolic conservation law entropy solution finite volume scheme error estimate discrete entropy inequality convergence rate

On a Vector Version of a Fundamental Lemma of ***

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2018年第1期39卷 33-46页

作者： philippe G. CIARLET Maria MALIN Cristinel MARDARE Department of Mathematics City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong. Sorbonne Universites Universite Pierre et Marie Curie Laboratoire Jacques-Louis Lions 4 Place Jussieu 75005 Paris France

Let ? be a bounded and connected open subset of R^N with a Lipschitzcontinuous boundary,the set ? being locally on the same side of ??.A vector version of a fundamental lemma of ***,due to ***,the first author,*** and ***,asserts that any vector field v =(vi) ∈(D′(?))~N,such that all the components 1/2(?_jv_i + ?_iv_j),1 ≤ i,j ≤ N,of its symmetrized gradient matrix field are in the space H^(-1)(?),is in effect in the space(L^2(?))~*** objective of this paper is to show that this vector version of *** lemma is equivalent to a certain number of other properties of interest by *** include in particular a vector version of a well-known inequality due to ***ˇcas,weak versions of the classical Donati and Saint-Venant compatibility conditions for a matrix field to be the symmetrized gradient matrix field of a vector field,or a natural vector version of a fundamental surjectivity property of the divergence operator.

关键词： J.L.Lions lemma Neˇcas inequality Donati compatibility conditions Saint-Venant compatibility conditions

Recovery of Immersions from Their Metric Tensors and Nonlinear Korn Inequalities:A Brief Survey

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2017年第1期38卷 253-280页

作者： philippe G.CIARLET Cristinel MARDARE Sorin MARDARE Department of Mathematics City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong. Sorbonne Universites Universite Pierre et Marie CurieLaboratoire Jacques-Louis LionsCNRS-UMR7598F-7.5005 Laboratoire de Mathematiques Raphael Salem UMR 6085 CNRS-Universite de Rouen Avenue de l'Universite BP.12 Technopole du Madrillet F76801

The authors discuss the existence and uniqueness up to isometries of Enof immersions φ : Ω  R^n→ E^n with prescribed metric tensor field(g ij) : Ω→ S^n>, and discuss the continuity of the mapping(gij) →φ defined in this fashion with respect to various topologies. In particular, the case where the function spaces have little regularity is considered. How, in some cases, the continuity of the mapping(gij) →φ can be obtained by means of nonlinear Korn inequalities is shown.

关键词： Isometric immersions Nonlinear Korn inequalities Metric tensor

How virtual reality can help visualise and assess geohazards

在线全文

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2019年第2期12卷 173-189页

作者： Hans-Balder Havenith philippe Cerfontaine Anne-Sophie Mreyen Georisk and Environment Department of GeologyUniversity of LiegeLiègeBelgium

Geohazard research requires extensive spatiotemporal understanding based on an adequate multi-scale representation of modelling *** most commonly applied representation basis for collected data is still the one of a 2D plane,typically a *** maps of spatial data can be visualised and processed by using Geographic Information *** is far less common to use 3D geomodels for the analysis and visualisation of spatial *** the visualisation of both spatial and temporal hazard components,there are no standardised *** claim that a full geohazard assessment is only possible inside a new type of geoscientific and technological environment that is at the same time multi-dimensional,spatiotemporal,integrated,fully interactive(tele-)immersive,and *** and subsurface processes are interacting at various scales that are difficult to be overviewed at *** Reality(VR)technology could provide an attractive solution to overcome the multi-dimensional and spatiotemporal *** review of geoscientific applications using VR technology developed by multiple teams around the world shows that some solutions have already been developed many years ago,but widespread use was not *** is clearly changing now and soon we will see if VR can contribute to a better understanding of geo-processes.

关键词： 4D geospace spatiotemporal analysis virtual environments immersive visualisation collaboration

Thermal characterization of bio-based phase changing materials in decorative wood-based panels for thermal energy storage

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2019年第1期4卷 56-65页

作者： Damien Mathis Pierre Blanchet Véronic Landry philippe Lagière NSERC Industrial Research Chair on Ecoresponsible Wood Construction(CIRCERB) Laval University Engineering and Mechanics Institute University of Bordeaux Avenue D'Aquitaine

Decorative wood panels containing pouches of bio-based phase changing materials(PCMs) were prepared. Three different PCM mixtures were used: a blend of capric and lauric acids as well as two commercial products, Puretemp?20 and Puretemp?23(Puretemp). The panels consist of engraved Medium Density Fiberboard(MDF) filled with a plastic pouch filled with PCM. High density fiberboard(HDF) was used on top of the panels to enclose the PCM pouches. PCM mixtures were first tested by differential scanning calorimetry(DSC). Phase change temperature and total heat storage of the panels were measured for both fusion and solidification with a Dynamic Heat-Flow Meter Apparatus(DHFMA). DSC and DHFMA results were compared, allowing a better understanding of results gathered from these two techniques. DSC calibration has been revealed important when assessing PCMs. The panels present a phase change temperature and a latent heat storage suitable for buildings applications. The panel made with Puretemp?23 presented the highest energy, with 57.1 J g^(-1). Thermal cycling was conducted on the panels to investigate thermal reliability, which revealed small modifications of thermal properties for two products. For all cases, latent heat was found stable. Hygro-mechanical behavior of the panels was also evaluated as these where designed to be esthetic decorative panels. This study exposes the potential of a new type of wood-based panels loaded with PCM for thermal energy storage and brings overall knowledge about PCM products thermal characterization.

关键词： PCM Wood Biosourced Fatty acids DHFMA

Measurement of electrical charges carried by airborne bacteria laboratory-generated using a single-pass bubbling aerosolizer

在线全文

学校读者我要写书评

暂无评论

Particuology 2015年第1期13卷 179-185页

作者： Xavier Simon Sébastien Bau Denis Bémer philippe Duquenne Institut National de Recherche et de Securite(INRS)

Widely used bioaerosol generators like Collison nebulizer probably produce electrostatically charged par- ticles, but the electrical charges carried by laboratory-generated airborne microorganisms using bubbling aerosolizers are poorly understood. In this study, we measured the fraction of neutral particles and num- ber of elementary charges per particle as a function of the aerodynamic diameter of airborne bacteria （Escherichia coli and Enterococcus hirae）. Bioaerosols were produced by a liquid sparging aerosolizer-type bubbling generator, with particle sizes ranging from roughly 0.6 to 2 p^m. The experimental setup included an electrostatic precipitator and real-time devices including an electrometer, aerodynamic particle sizer, and electrical low-pressure impactor. Experimental results obtained for various operating conditions showed that aerosols produced with a higher bubbling airflow contained a larger proportion of neutral particles （from around 30% to 50%） and that bacteria carried a greater average absolute number of elementary charges （from around -10 to -60 elementary units） than those under lower airflow. Under the investigated conditions, a neutralization step is unnecessary because it may have a negative effect on the viability of sensitive microorganisms. Our results suggest that the neutral fraction can be used down- stream of an electrostatic precipitator, and that this setup may have advantages over bipolar neutralizers.

关键词： Bubbling generator Bioaerosol Electrical charge Electrostatic precipitator Escherichia coil Enterococcus hirae

Pressureless sintering behavior and properties of Ag-SnO_2

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2019年第1期38卷 35-41页

作者： Henri Desplats Elodie Brisson philippe Rogeon Patrick Carré Alexandre Bonhomme Department of Materials Engineering IRDL FRE CNRS 3744University of South Brittany Schneider Electric-Electropole 31 rue Pierre Mendes France

In this study, the results of measurements on pressureless sintering behavior of Ag-SnO_2(88%wt Ag,12%wt SnO_2) pellets were reported. Dilatometric measurements, relative densities, hardness values, rupture transverse strength and electrical conductivities function of sintering temperatures were presented. A constant thermal expansion coefficient was determined, and a threshold temperature of densification(T_d) was exhibited. Sintering kinetics were reported for different temperatures. Hardness values were measured, and no increase in hardness is found under Td. Three-points bending tests were used to determine the transverse rupture strength whose evolution appears importantly well under Td. In the same manner, the increase in initial electrical conductivities begins well under Td. Under the threshold temperature, the relative increase in electrical conductivity is found to be independent of initial density of green compact pellets. This work highlights different evolutions in function of sintering temperature for the electrical conductivity and transverse rupture strength on the one hand, and for the densification and hardness on the other hand.

关键词： Ag-SnO2 Pressureless sintering Dilatometry Mechanical properties Electrical conductivity

Acute liver failure:individualization of care and minimizing the need for liver transplantation

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary Surgery and Nutrition 2024年第5期13卷 865-868页

作者： philippe Ichaï Faouzi Saliba Liver Intensive Care Unit AP-HP Hôpital Paul-BrousseCentre Hépato-BiliaireVillejuifFrance UniversitéParis-Saclay and INSERM Unit N°1193 VillejuifFrance

Acute liver failure(ALF)is a challenging condition that requires a rapid transfer and management in a specialized intensive care unit affiliated to a transplant *** outcome depends mainly on patient’s age,etiology of ALF,severity of the neurological damage at time of presentation,systemic and brain hemodynamic status and the possibility of a rapid access to liver transplantation(LT).Nevertheless,in recent years,the global survival rate improved and the number of patients with ALF who do not require LT have significantly *** 1998 and 2013,the gap of improvement was respectively 12%and 25%(1).

关键词： Acute liver failure(ALF) artificial liver support liver transplantation(LT)

Comparison and analysis of the efficacy of drug therapy for liver cancer

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatoma Research 2020年第9期6卷 55-64页

作者： philippe Merle Miroslava Subic Unitéd’Hépatologie et Gastroentérologie Hôpital de la Croix RousseHospices Civils de LyonLyon 69004France. Centre de Recherche en Cancérologie de Lyon INSERM U1052Lyon 69003France. UniversitéClaude Bernard Lyon 1 Villeurbanne 69100France

Hepatocellular carcinoma(HCC)is a poor prognosis tumor when not accessible to potentially curative treatments such as surgical resection,thermal ablations or liver *** cytotoxic chemotherapies have shown inconsistent clinical *** 2007,sorafenib,a tyrosine kinase inhibitor(TKI),was the first systemic therapy able to significantly improve the outcome of HCC patients non-eligible for curative or loco-regional therapies,despite a modest tolerance and low tumor objective response rate(ORR).Among the newer TKIs approved after 2017,lenvatinib was the first to show a striking ORR and demonstrate non-inferiority *** in the first-line ***,phase 3 trials showed the benefit of other TKIs,regorafenib and cabozantinib,and the anti-angiogenic ramucirumab monoclonal antibody,in systemic second-line *** checkpoint inhibitors targeting PD1,achieved striking tumor shrinkage in some patients in monotherapy,seeming to be associated with exciting ***,this occurred in too few patients to improve the median overall *** recently,the combination of anti-angiogenic drugs targeting the liver microenvironment with PD-1/PD-L1 inhibitors,such as the combination of bevacizumab and atezolizumab,proved to be substantially effective in phase 3,and other combinations of PD-1/PD-L1 and CTLA-4 inhibitors or TKIs have raised a lot of hopes for the systemic treatment of HCC.

关键词： Hepatocellular carcinoma therapy immune checkpoint inhibitors tyrosine kinase inhibitors