检索结果-南通市图书馆

Oil Strategies Benefits over Different Driving Cycles using Numerical Simulation

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 Thermal Science 2017年第4期26卷 371-377页

作者： Hanna SARA David CHALET Mickael CORMERAIS Jean-francois HETET Ecole Centrale de Nantes LHEEA lab.(ECN/CNRS)NantesFrance MANN+HUMMEL France LavalFrance

95 g/kin is the allowed quantity of CO2 emission normalized to NEDC to be set in 2020. In addition, NEDC will be replaced by more severe driving cycles and will be united worldwide. To respond to those criteria, automotive industries are working on every possible field. Thermal management has been proved to be effective in reducing fuel consumption. Cold start is a primordial reason of ovcrconsumption, as the engine highest efficiency is at its optimal temperature. At cold start, the engine＇s oil is at its lowest temperature and thus its higher viscosity level. A high viscosity oil generates more friction, which is one of the most important heat losses in the engine. In th/s paper, hot oil storage is studied. Numerical simulations on GT-suite model were done. The model consists of a 4-cylinder turbocharged Diesel engine using a storage volume of 1 liter of hot oil. Ambient temperature vari- ation were taken into consideration as well as different driving cycles. Furthermore, different configurations of the thermal strategy （multifunction oil sump） were proposed and evaluated. Lubricant temperature and viscosity profiles are presented in the article as well as fuel consumption savings for different configurations, driving cycles and ambient temperatures.

关键词： Thermal management Hot oil storage Oil sump Oil viscosity Fuel consumption

Investigation of bright and dark solitons in α,β-Fermi Pasta Ulam lattice

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第2期30卷 211-219页

作者： Nkeh Oma Nfor Serge Bruno Yamgoué francois Marie Moukam Kakmeni Department of Physics Higher Teacher Training College BambiliThe University of BamendaP.O.Box 39Bambili-Cameroon Complex Systems and Theoretical Biology Group Laboratory of Research on Advanced Materials and Nonlinear Science(LaRAMaNS)Department of PhysicsFaculty of ScienceUniversity of BueaP.O.Box 63 Buea-Cameroon

We consider the Hamiltonian ofα,β-Fermi Pasta Ulam lattice and explore the Hamilton-Jacobi formalism to obtain the discrete equation of *** using the continuum limit approximations and incorporating some normalized parameters,the extended Korteweg-de Vries equation is obtained,with solutions that elucidate on the Fermi Pasta Ulam *** further derive the nonlinear Schrodinger amplitude equation from the extended Korteweg-de Vries equation,by exploring the reductive perturbative *** dispersion and nonlinear coefficients of this amplitude equation are functions of theαandβparameters,with theβparameter playing a crucial role in the modulational instability analysis of the ***βgreater than or equal to zero,no modulational instability is observed and only dark solitons are identified in the *** forβless than zero,bright solitons are traced in the lattice for some large values of the *** of numerical simulations of both the Korteweg-de Vries and nonlinear Schr¨odinger amplitude equations with periodic boundary conditions clearly show that the bright solitons conserve their amplitude and shape after collisions.

关键词： Fermi Pasta Ulam paradox bright dark

In-situ diagnostic of femtosecond laser probe pulses for high resolution ultrafast imaging

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2021年第7期10卷 1326-1338页

作者： Chen Xie Remi Meyer Luc Froehly Remo Giust francois Courvoisier Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Technology of Ministry of EducationSchool of Precision Instruments and Opto-electronics EngineeringTianjin University300072 TianjinChina FEMTO-ST Institute Univ.Bourgogne Franche-ComtéCNRS15B avenue des Montboucons25030 Besançon CedexFrance

Ultrafast imaging is essential in physics and chemistry to investigate the femtosecond dynamics of nonuniform samples or of phenomena with strong spatial *** relies on observing the phenomena induced by an ultrashort laser pump pulse using an ultrashort probe pulse at a later *** years have seen the emergence of very successful ultrafast imaging techniques of single non-reproducible events with extremely high frame rate,based on wavelength or spatial frequency ***,further progress in ultrafast imaging towards high spatial resolution is hampered by the lack of characterization of weak probe *** pump–probe experiments realized within solids or liquids,because of the difference in group velocities between pump and probe,the determination of the absolute pump–probe delay depends on the sample *** addition,pulse-front tilt is a widespread issue,unacceptable for ultrafast imaging,but which is conventionally very difficult to evaluate for the low-intensity probe *** we show that a pump-induced micro-grating generated from the electronic Kerr effect provides a detailed in-situ characterization of a weak probe *** allows solving the two issues of absolute pump–probe delay determination and pulse-front tilt *** approach is valid whatever the transparent medium with nonnegligible Kerr index,whatever the probe pulse polarization and *** it is nondestructive and fast to perform,this in-situ probe diagnostic can be repeated to calibrate experimental conditions,particularly in the case where complex wavelength,spatial frequency or polarization encoding is *** anticipate that this technique will enable previously inaccessible spatiotemporal imaging in a number of fields of ultrafast science at the micro-and nanoscale.

关键词： pump polarization laser

On Triangular Lattice Boltzmann Schemes for Scalar Problems

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 2013年第3期13卷 649-670页

作者： francois Dubois Pierre Lallemand Conservatoire National des Arts et Metiers Department of MathematicsParisand Department of MathematicsUniversity Paris-SudBat.425F-91405 Orsay CedexFrance Centre National de la Recherche Scientifique ParisFrance

We propose to extend the d’Humi`eres version of the lattice Boltzmann scheme to triangular *** use Bravais lattices or more general lattices with the property that the degree of each internal vertex is supposed to be *** such meshes,it is possible to define the lattice Boltzmann scheme as a discrete particle method,without need of finite volume formulation or Delaunay-Voronoi hypothesis for the *** test this idea for the heat equation and perform an asymptotic analysis with the Taylor expansion method for two schemes named D2T4 and *** results show a convergence up to second order accuracy and set new questions concerning a possible super-convergence.

关键词： Laplacian operator heat equation d’Humi`eres scheme D2T4 D2T7

On the Anisotropic Gaussian Velocity Closure for Inertial-Particle Laden Flows

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 2015年第1期17卷 1-46页

作者： Aymeric Vie francois Doisneau Marc Massot CNRS Laboratoire EM2C-UPR 288 Grande Voie des Vignes92295 Chatenay-MalabryFrance Ecole Centrale Paris Grande Voie des Vignes92295 Chatenay-MalabryFrance ONERA Chemin de la Huni`ere91120Palaiseau France Federation de Mathematiques de l’Ecole Centrale Paris FR CNRS 3487France Center For Turbulence Research Stanford University488Escondido MallStanford CA 94305-3035USA

The accurate simulation of disperse two-phase flows,where a discrete particulate condensed phase is transported by a carrier gas,is crucial for many applications;Eulerian approaches are well suited for high performance computations of such *** when the particles from the disperse phase have a significant inertia compared to the time scales of the flow,particle trajectory crossing(PTC)occurs *** particle velocity distribution at a given location can become *** properly account for such a phenomenon many Eulerian moment methods have been recently proposed in the *** resulting models hardly comply with a full set of desired criteria involving:1-ability to reproduce the physics of PTC,at least for a given range of particle inertia,2-well-posedness of the resulting set of PDEs on the chosen moments as well as guaranteed realizability,3-capability of the model to be associated with a high order realizable numerical scheme for the accurate resolution of particle segregation in turbulent *** purpose of the present contribution is to introduce a multi-variate Anisotropic Gaussian closure for such particulate flows,in the spirit of the closure that has been suggested for out-of-equilibrium gas dynamics and which satisfies the three *** novelty of the contribution is *** we derive the related moment system of conservation laws with source terms,and justify the use of such a model in the context of high Knudsen numbers,where collision operators play no *** exhibit the main features and advantages in terms of mathematical structure and *** a second order accurate and realizable MUSCL/HLL scheme is proposed and *** the behavior of the method for the description of PTC is thoroughly investigated and its ability to account accurately for inertial particulate flow dynamics in typical configurations is assessed.

关键词： Particulate flows kinetic theory moment method particle trajectory crossing

An Efficient Sampling Method for Regression-Based Polynomial Chaos Expansion

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 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

Lagrangian model of zooplankton dispersion:numerical schemes comparisons and parameter sensitivity tests

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 Oceanology and Limnology 2011年第2期29卷 438-445页

作者：丘仲锋 Andrea M.DOGLIOLI 何宜军 francois CARLOTTI Key Laboratory of Ocean Circulation and Waves Institute of Oceanology CAS Laboratoire d'Ocanographie Physique et Biogochimie Aix Marseille UniversiteCNRSUMR 6535MarseilleFrance

This paper presents two comparisons or tests for a Lagrangian model of zooplankton dispersion:numerical schemes and time ***,we compared three numerical schemes using idealized *** show that the precisions of the advanced Adams-Bashfold-Moulton(ABM) method and the Runge-Kutta(RK) method were in the same order and both were much higher than that of the Euler ***,the advanced ABM method is more efficient than the RK method in computational memory requirements and time *** therefore chose the advanced ABM method as the Lagrangian particle-tracking ***,we performed a sensitivity test for time steps,using outputs of the hydrodynamic model,*** show that the time step choices depend on the fluid response time that is related to the spatial resolution of velocity *** method introduced by Oliveira et *** 2002 is suitable for choosing time steps of Lagrangian particle-tracking models,at least when only considering advection.

关键词： Lagrangian numerical scheme time steps zooplankton

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

战后杂志在法国的作用

第欧根尼 2024年第1期 15-34,147页

作者：弗朗索瓦·多斯遇荟(译) 不详

思想不会自行传播,而是依赖于社会团体和杂志构成的网络得以传播。杂志作为使知识分子声音合法化的主要载体,不仅是知识可见度和评审的场所,更是其思想被认可的“资格证书”。它们如同知识分子思想生命中的肺,通过其多样性,成为争议、... 详细信息

思想不会自行传播,而是依赖于社会团体和杂志构成的网络得以传播。杂志作为使知识分子声音合法化的主要载体,不仅是知识可见度和评审的场所,更是其思想被认可的“资格证书”。它们如同知识分子思想生命中的肺,通过其多样性,成为争议、辩论和所谓“解释的冲突”(利科,1969)的理想舞台。

关键词：知识分子思想可见度资格证书杂志合法化主要载体多样性传播

Sirolimus,bevacizumab,5-Fluorouracil and irinotecan for advanced colorectal cancer:A pilot study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第34期15卷 4278-4283页

作者： francois Ghiringhelli Boris Guiu Bruno Chauffert Sylvain Ladoire Department of Medical Oncology Georges-Francois Leclerc Cancer Center Department of Radiology Georges-Francois Leclerc Cancer Center

AIM： To evaluate the efficacy and the safety of combined 5-Fluorouracil, irinotecan, bevacizumab and sirolimus in refractory advanced colorectal carcinoma. METHODS： We initiated a regimen with at day 1 an injection （iv） of bevacizumab at 5 mg/kg, followed by 180 mg/m^2 irinotecan, followed by Leucovorin 400 mg/m^2, followed by a 5-Fluorouracil bolus 400 mg/m^2 and a 46-h infusion 2400 mg/m^2. Sirolimus was given orally as continuous administration of 2 mg twice a day every days. This treatment was repeated every 14 d. RESULTS： A total of 12 patients were enrolled. All patients presented with metastatic disease that had failed at least three lines of chemotherapy that contained oxaliplatin, irinotecan and bevacizumab. Cetuximab failure was also observed in all K-Ras wildtype patients. The median number of cycles was 8.5 （range 2-20） and clinical benefit was observed in eight patients. The median time to progression was 5 mo and the median survival was 8 too. Grade 3 neutropenia developed in four patients, and grade 3 diarrhea and stomatitis in ***： The combination regimen of 5-Fluorouracil,irinotecan, bevacizumab and sirolimus in advanced colorectal carcinoma after failure of dassical *** is feasible and promising. Further evaluation of this combination is required.

关键词： Colorectal cancer Bevacizumab 5-Fluorouracil Irinotecan Sirolimus Antineoplastic combinedchemotherapy protocols Angiogenesis