检索结果-南通市图书馆

Analysis of a System Describing Proliferative-Quiescent Cell Dynamics

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2期39卷 345-356页

作者： Jean CLAIRAMBAULT benoit PERTHAME Andrada Quillas MARAN Inria de Paris Team MambaF75005 Paris France Sorbonne Univ. UPMC Univ. Paris 06 Laboratoire Jacques-Louis Lions UMR CNRS 7598 Univ. Paris-DiderotF75005 Paris France

Systems describing the dynamics of proliferative and quiescent cells are commonly used as computational models, for instance for tumor growth and *** on the very earliest stages of hematopoiesis, stem cells and early progenitors, the authors introduce a new method, based on an energy/Lyapunov functional to analyze the long time behavior of solutions. Compared to existing works, the method in this paper has the advantage that it can be extended to more complex situations. The authors treat a system with space variable and diffusion, and then adapt the energy functional to models with three equations.

关键词：动力学系统房间静止计算模型长时间行为肿瘤生长干细胞

Multilayer optics for the EUV and soft X-rays

在线全文

学校读者我要写书评

暂无评论

光学精密工程 2005年第4期13卷 421-429页

作者： Torsten Feigl Sergiy Yulin Nicolas benoit Norbert Kaiser Fraunhofer Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 D-07745 Jena GermanyFraunhofer Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 D-07745 Jena GermanyFraunhofer Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 D-07745 Jena GermanyFraunhofer Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 D-07745 Jena Germany

The demand to enhance the optical resolution, to structure and observe ever smaller details, has pushed the way towards the EUV and soft X-rays. Induced mainly by the production of more powerful electronic circuits with the aid of projection lithography, optics developments in recent years can be characterized by the use of electromagnetic radiation with smaller wavelength. The good prospects of the EUV and soft X-rays for next generation lithography systems (λ=13.5 nm), microscopy in the “water window” (λ=2.3～4.4 nm), astronomy (λ=5～31 nm), spectroscopy, plasma diagnostics and EUV/soft X-ray laser research have led to considerable progress in the development of different multilayer optics. Since optical systems in the EUV/soft X-ray spectral region consist of several mirror elements a maximum reflectivity of each multilayer is essential for a high throughput. This paper covers recent results of the enhanced spectral behavior of Mo/Si, Cr/Sc and Sc/Si multilayer optics.

关键词： EUV X射线多层膜光学涂覆技术 Mo/Si Cr/Sc Sc/Si 光电子技术

Implantable cardiac defibrillators in octogenarians

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2023年第1期20卷 23-31页

作者： Maarten Pauwelyn Sebastian Ingelaere Ruben Hoffmann Johan Vijgen Georges H.Mairesse Ivan Blankoff Yves Vandekerckhove Jean-benoit le Polain de Waroux Bert Vandenberk Rik Willems University Hospitals Leuven CardiologyLeuvenBelgium KU Leuven Department of Cardiovascular SciencesLeuvenBelgium UZA Department of CardiologyAntwerpBelgium Jessa Ziekenhuis Department of CardiologyHasseltBelgium Cliniques du Sud Luxembourg Department of CardiologyArlonBelgium CHU Charleroi Department of CardiologyCharleroiBelgium AZ Sint-Jan Department of CardiologyBruggeBelgium University of Calgary Libin Cardiovascular InstituteCalgaryCanada

OBJECTIVE Implantable cardiac defibrillators(ICD)implantation in the very elderly remains *** aimed to describe the experience and outcome of patients over 80 years old implanted with an ICD in *** Data were extracted from the national QERMID-ICD *** implantations performed in octogenarians between February 2010 and March 2019 were *** on baseline patient characteristics,type of prevention,device configuration and all-cause mortality were *** determine predictors of mortality,multivariable Cox proportional hazard regression modelling was *** Nationwide,704 primo ICD implantations were performed in octogenarians(median age 82,IQR 81-83 years;83% male and 45% secondary prevention).During a mean follow-up of 3.1±2.3 years,249(35%)patients died,of which 76(11%)within the first year after *** multivariable Cox regression analysis age(HR=1.15,P=0.004),oncological history(HR=2.43,P=0.027)and secondary prevention(HR=2.23,P=0.001)were independently associated with 1-year mortality.A better preserved left ventricular ejection fraction(LVEF)was associated with a better outcome(HR=0.97,P=0.002).Regarding overall mortality multivariable analysis withheld age,history of atrial fibrillation,centre volume and oncological history as significant *** LVEF was again protective(HR=0.99,P=0.008).CONCLUSIONS Primary ICD implantation in octogenarians is not often performed in *** this population,11%died within the first year after ICD *** age,oncological history,secondary prevention and a lower LVEF were associated with an increased one-year ***,low LVEF,atrial fibrillation,centre volume and oncological history were indicative of higher overall mortality.

关键词： prevention implantation protective

Fabrication of lithium silicates from zeolite for CO2 capture at high temperatures

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第6期28卷 81-89页

作者： Yu Zhang Yanshan Gao benoit Louis Qiang Wang Weiran Lin College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China ICPEES - Institut de Chimie et Procedes pour l’energie l’Environnement et la SanteUMR 7515 CNRS - Universite de Strasbourg67087 StrasbourgFrance Beijing Research Institute of Chemical Industry SINOPECBeijing 100013China

Li4Si O4 has been regarded as one of the most promising high-temperature CO2 ***,for practical applications,its CO2sorption kinetics,cycling stability and sorption properties at lower temperatures or lower CO2 concentrations have to be *** this contribution,four Li4Si O4 sorbents were synthesized from zeolite precursors MCM-41,MCM-48,TS-1,and *** CO2 uptake,cycling stability and the optimal CO2 sorption conditions were *** the samples,MCM-41-Li4Si O4 showed the best cycling stability at 650°C,with a stable reversible CO2 uptake of 29.1 wt%under 100 vol%CO2 during 20 *** its sorption kinetics and CO2 uptakes at lower temperatures and lower CO2 concentrations need to be *** then demonstrated that the sorption kinetics can be improved by modifying the MCM-41 precursor with metals such as Al,Ti,Ca,and *** Na-MCM-41-Li4Si O4 sample exhibited the highest sorption rate,and reached the equilibrium sorption capacity close to the theoretical value of 36.7 wt%within 20 *** addition,we proved that coating the MCM-41-Li4Si O4with Na2CO3and K2CO3can significantly increase the CO2uptakes at lower temperatures(e.g.550℃)and lower CO2concentrations(10–20 vol%).At 550℃ and under 20 vol%CO2,15 wt%K2CO3-MCM-41-Li4Si O4 and 10 wt%Na2CO3-MCM-41-Li4Si O4 sorbents resulted in a CO2 uptake of 32.2 wt%and 34.7 wt%,respectively,which are much higher than that of MCM-41-Li4Si O4(11.8 wt%).These two sorbents also showed good cycling *** promoiting mechasnim by alkali carbonate coating was discussed by a doubleshell model.

关键词： Li4SiO4 Zeolite Lithium silicate-based CO2 sorbents Global warming

Dirac Concentrations in a Chemostat Model of Adaptive Evolution(In honor of the immense scientific influence of Ham Brezis)

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2期38卷 513-538页

作者： Alexander LORZ benoit PERTHAME Cécile TAING Sorbonne Universits UPMC Univ Paris 06InriaLaboratoire Jacques-Louis Lions UM R CNRS 7598F75005 ParisFrance

This paper deals with a non-local parabolic equation of Lotka-Volterra type that describes the evolution of phenotypically structured populations. Nonlinearities appear in these systems to model interactions and competition phenomena leading to selection. In this paper, the equation on the structured population is coupled with a differential equation on the nutrient concentration that changes as the total population *** methods aimed at showing the convergence of the solutions to a moving Dirac mass are reviewed. Using either weak or strong regularity assumptions, the authors study the concentration of the solution. To this end, BV estimates in time on appropriate quantities are stated, and a constrained Hamilton-Jacobi equation to identify where the solutions concentrates as Dirac masses is derived.

关键词： Adaptive evolution, Asymptotic behaviour, Chemostat, Dirac concentrations,Hamilton-Jacobi equations, Lotka-Volterra equations, Viscosity solutions

Forecasting the development of boreal paludified forests in response to climate change: a case study using Ontario ecosite classification

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2015年第1期2卷 45-55页

作者： benoit Lafleur Nicole J Fenton Yves Bergeron Institut de recherche sur les forêts Université du Québec en Abitibi-Témiscamingue 445 boul. de l’Université Rouyn-Noranda QC J9X 5E4 Canada Centre d’étude de la forêt Université du Québec à Montréal 141 Avenue du Président-Kennedy Montréal QC H2X 1Y4 Canada

Background：Successional paludification,a dynamic process that leads to the formation of peatlands,is influenced by climatic factors and site features such as surficial deposits and soil *** boreal regions,projected climate change and corresponding modifications in natural fire regimes are expected to influence the paludification process and forest *** objective of this study was to forecast the development of boreal paludified forests in northeastern North America in relation to climate change and modifications in the natural fire regime for the period 2011–***：A paludification index was built using static（*** deposits and soil texture）and dynamic（*** regime and soil organic layer thickness）stand scale factors available from forest *** index considered the effects of three temperature increase scenarios（i.e.＋1°C,＋3°C and＋6°C）and progressively decreasing fire cycle（from 300 years for 2011–2041,to 200 years for 2071–2100）on peat accumulation rate and soil organic layer（SOL）thickness at the stand level,and paludification at the landscape ***：Our index show that in the context where in the absence of fire the landscape continues to paludify,the negative effect of climate change on peat accumulation resulted in little modification to SOL thickness at the stand level,and no change in the paludification level of the study area between 2011 and ***,including decreasing fire cycle to the index resulted in declines in paludified ***,the index predicts a slight to moderate decrease in the area covered by paludified forests in 2100,with slower rates of ***：Slower paludification rates imply greater forest productivity and a greater potential for forest harvest,but also a gradual loss of open paludified stands,which could impact the carbon balance in paludified ***,as the thick Sphagnum layer typical of paludified forests may protect soil organic layer from dr

关键词： Boreal forest Canada Carbon sequestration Paludification Peat forests Forest harvest

Na_2BaMg(PO_4 )_2:synthesis, crystal structure and europium photoluminescence properties

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2013年第9期31卷 849-856页

作者： Amal Boukhris Mourad Hidouri benoit Glorieux Mongi Ben Amara UR:Inorganic Materials Faculty of ScienceUniversity of Monastir Institute for Condensed Matter Chemistry of Bordeaux CNRS University of Bordeaux I87Avenue of Dr.A.Schweitzer33608 Pessac-CedexFrance

Na2BaMg（PO4）2 was synthesized and characterized by X-ray diffraction, differential thermal analysis （DTA）, 31p NMR spectroscopy and photoluminescence measurements. This compound crystallized in the P3 ml space group of the trigonal system with the parameters of equivalent hexagonal cell a=0.5305（1） nm and c=0.6986（3） nm. The structure showed a perfect isotipysm with the mineral glaserite KaNa（SO4）2. Thus, it exhibited a lamellar framework which could be described as the stacking along the [001] direc- tion of [MgP2O84-]∞ layers of comer sharing MgO6 polyhedra and PO4 tetrahedra. The Ba2＋ cations were located within the interlayer space, while the Na＋ ones were found in large cavities bound to the layers. The DTA analysis showed that this compound melt con- gruently at 1385 K. The 31p NMR spectrum was consistent with the presence of a single phosphorus site in the structure. Optical properties were investigated for the 5% doped Eu3＋ and Eu2＋ phases. The trivalent europium was used as a local probe, replacing bar- ium while the divalent europium was used to examine whether this material could be used as an optical applications.

关键词： phosphate 31p NMR crystal structure europium photoluminescence rare earths

Anionic Polymerization of Butadiene Using Lithium/Potassium Multi-metallic Systems:Influence on Polymerization Control and Polybutadiene Microstructure

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第4期38卷 357-362,I0006页

作者： Antoine Forens Kevin Roos Charlotte Dire benoit Gadenne Stephane Carlotti Univ.Bordeaux CNRSBordeaux INPLCPOUMR 5629F-33600PessacFrance MFP Michelin Centre de Technologie/Ladoux23 Place des Carmes Dechaux63040 Clermont-Ferrand cedex 9France

Thermal,mechanical,and viscoelastic properties of polybutadiene-based rubber materials are highly dependent on polybutadiene *** use of polar modifier in association with alkyllithium is a well-known method to obtain polybutadiene with a high vinyl con *** approach is to use bimetallic initiating species such as alkyllithium combined to heavier alkali metal alkoxide(RONa,ROK...).The polymerization control is n evertheless not achieved and several parameters were found to influe nee *** bimetallic in itiating systems based on alkyllithium and a potassium alkoxide,alkyllithium structure,initiator preformation time,and initiator composition were identified as parameters influencing the anionic polymerization process of butadiene and/or polybutadiene *** addition,the use of trimetallic systems based on alkyllithium,potassium alkoxide,and alkylaluminum was investigated in order to prevent side reactions regardless of the[K]/[Li]ratio and of the initiator preformation time.

关键词： Polybutadiene Anionic polymerization Microstructure (Multi)metallic systems Lithium/potassium-based systems

An Efficient Sampling Method for Regression-Based Polynomial Chaos Expansion

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2013年第4期13卷 1173-1188页

作者： Samih Zein benoit Colson Francois Glineur Samtech H.Q. LMS International8 rue des chasseurs ardennais AngleurBelgium Center for Operations Research and Econometrics&Information and Communication Technologies Electronics and Applied Mathematics InstituteUniversite catholique de LouvainB-1348 Louvain-la-NeuveBelgium

The polynomial chaos expansion(PCE)is an efficient numerical method for performing a reliability *** relates the output of a nonlinear system with the uncertainty in its input parameters using a multidimensional polynomial approximation(the so-called PCE).Numerically,such an approximation can be obtained by using a regression method with a suitable design of *** cost of this approximation depends on the size of the design of *** the design of experiments is large and the system is modeled with a computationally expensive FEA(Finite Element Analysis)model,the PCE approximation becomes *** aim of this work is to propose an algorithm that generates efficiently a design of experiments of a size defined by the user,in order to make the PCE approximation computationally *** is an optimization algorithm that seeks to find the best design of experiments in the D-optimal sense for the *** algorithm is a coupling between genetic algorithms and the Fedorov exchange *** efficiency of our approach in terms of accuracy and computational time reduction is compared with other existing methods in the case of analytical functions and finite element based functions.

关键词： Polynomial chaos expansion regression D-optimal design Fedorov Algorithm genetic algorithms