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Critical links detection in stochastic networks: application to the transport networks

International Journal of Intelligent Computing and Cybernetics 2019年第1期12卷 42-69页

作者： Mourad guettiche Hamamache Kheddouci département d’Informatique Facultédes Sciences ExactesUniversitéde BejaiaBejaiaAlgeria and Département de Mathématiques et InformatiqueCentre Universitaire de MilaMilaAlgeria Universite Claude Bernard Lyon 1 VilleurbanneFrance

Purpose–The purpose of this paper is to study a multiple-origin-multiple-destination variant of dynamic critical nodes detection problem(dCNdP)and dynamic critical links detection problem(dCLdP)in stochastic *** and dCLdP consist of identifying the subset of nodes and links,respectively,whose deletion maximizes the stochastic shortest paths between all origins–destinations pairs,in the graph modeling the transport *** identification of such nodes(or links)helps to better control the road traffic and predict the necessary measures to avoid ***/methodology/approach–A Markovian decision process is used to model the shortest path problem underdynamic *** criticalnodes(links)whileconsideringthe dynamicity of the traffic network are ***,sensitivity analysis toward capacity reduction for critical links is ***,the complexity of the underlying algorithms is analyzed and the computational efficiency resulting from the decomposition operation of the network into communities is ***–The numerical results demonstrate that the use of dynamic shortest path(time dependency)as a metric has a significant impact on the identification of critical nodes/links and the experiments conducted on real world networks highlight the importance of sensitive links to dynamically detect critical links and elaborate smart transport *** limitations/implications–The research in this paper also revealed several challenges,which call for future ***,the authors have restricted our experimentation to a small network where the only focus is on the model behavior,in the absence of historical *** authors intend to extend this study to very large network using real ***,the authors have considered only congestion to assess network’s criticality;future research on this topic may include other factors,mainly *** implications–Taking i

关键词： Critical links Critical nodes Markovian decision process Transport networks

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Effects of accelerating and decelerating flows in a channel with vegetated banks and gravel bed

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International Journal of Sediment Research 2012年第2期27卷 188-200页

作者： Hossein AFZALIMEHR Elham Fazel NAJAFABAdI Jacques gALLICHANd department of Water Engineering Isfahan University of Technology84156-83111Iran dpartement des sols et de gnie agroalimentaire Pavilion Paul-Comtois Universit LavalSt-FoyQCCanada

Experiments were conducted in an 8 m long,40 cm wide,and 60 cm deep re-circulating flume with vegetated banks and gravel bed to study the effects of accelerating and decelerating flows on the flow *** dip phenomenon was observed in velocity profiles under decelerating flow and the velocity defect law was not suitable due to the effect of vegetated *** the vegetated banks, the turbulence intensities illustrated convex distribution for both accelerating and decelerating flows. Application of quadrant analysis revealed that the effect of vegetated banks is important on the flow structure and the Reynolds stress *** and decelerating flows did not show a significant difference on percentage of time occupied by each kind of turbulent event within bursting cycle,but affected the shape of joint probability distributions of turbulent intensities in the horizontal and vertical directions.

关键词： Vegetated bank decelerating and accelerating flows gravel bed Reynolds stress

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An Integrated Approach for Improved Permeability and Reservoir Quality Prediction in Multiporosity Systems， Tahe Ordovician Naturally Fractured Vuggy Carbonates

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Journal of Earth Science 2022年

作者： Issoufou Aboubacar Mahaman Salifou Heng Zhang Issoufou Ousmane Boukari Jie Li Cai Zhongxian Université dan dicko dankoulodo de Maradi， Faculté des Sciences et Techniques， département de géologie Key Laboratory of Tectonics and Petroleum Resources， Ministry of Education， China University of geosciences (Wuhan) Université Abdou Moumouni， Faculté des Sciences et Techniques， département de géologie

Carbonates present complex pore systems that strongly influence the physical properties and their interrelationships. This study proposes a new approach to establish pore-type mixing-based permeability transforms by integrating well-log and core data. We investigate the influence of pore-structure heterogeneity on permeability and velocity through the rock-frame flexibility factors (γ and γμ)， derivable using standard sonic and density logs. We derive permeability transforms， with correlation coefficients， R of 0.8 to 0.9， from core measurements and pore-structure variations-dependent physical parameters， namely the porosity exponent (m)， Poisson’s ratio (σ)， velocity deviation log (VdL)， and velocity ratio (VR). Through extrapolation using log-data， the m- and VdL- based correlations provide significantly better permeability estimates， with the highest accuracy attained with the m-based correlation， whereas the VR- and σ- based correlations lead to permeability overestimation for high porosities. We plotted log-derived porosity vs. permeability， obtained applying the m-based correlation， to generate consistent porosity-permeability relationships， which account for pore-structure heterogeneity， by sorting the scattering points into distinct groups/trends by considering the variations of pore-structure types and abundance of a specific porosity. For the studied oilfield， three porosity-permeability relationships are identified， with correlation coefficients approaching 0.9， thus validating the approach and supporting its application in petrophysically similar reservoirs.

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Electronic structure of the rare-earth superstoichiometric dihydride gdH_(2.25)

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Rare Metals 2022年第8期41卷 2794-2799页

作者： Zahia Ayat Aomar Boukraa Abdelouahab Ouahab Bahmed daoudi Fac.des Mathématiques et des Sciences de la Matière Lab.Développement desénergies nouvelles et renouvelables dans les zones arides et sahariennesUniversity of Ouargla30000OuarglaAlgeria département des Sciences de la Matière Facultédes Sciences Exactes et des Sciences de la Nature et de la VieUniversitéMohamed Khider Biskra07000BiskraAlgeria

With the WIEN2 k simulation code,ab initio calculations of electronic structure and of equilibrium properties for the superstoichiometric rare-earth dihydride gdH_(2.25)using the full-potential linearized augmented plane-wave(FP-LAPW)method within density functional theory(dFT)in generalized gradient approximation(ggA)were *** lattice parameter,bulk modulus,pressure derivative,density of states(dOS)and energy band structures were *** ggA-optimized lattice parameter agrees much better with the experimental findings than the local density approximation(LdA)*** non-negligible electronic dOS at Fermi level confirms that gdH_(2.25)has a metallic *** Fermi energy(E_(F))falls at a level where most of the states are rare-earth 5 d conduction states while negligible contributions of both interstitial(tetrahedral and octahedral)H s states are observed near *** is found that hybridization exists between s electronic orbital of both interstitial H atoms and d electronic orbitals of gd.

关键词： Rare-earth dihydrides gdH_(2.25) density functional theory Ab initio calculations WIEN2k

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Morphology and Photoelectrochemical Characterization of MEH-PPV/PCBM Composite Film doped with TiO_2 Nanoparticles

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Acta Metallurgica Sinica(English Letters) 2013年第4期26卷 373-377页

作者： Farid Habelhames Zerguine Wided Leila Lamiri Belkacem Nessark Hassina derbal-Habak Laboratoire d'lectrochimie et matriaux(LEM) Facult de Technologie.Dpartement de gnie des Universit Ferhat Abbas Stif 119000Algrie ECOLE POLYTECHNIQUE LPICM LaboratoryORGATECH Team Route de Saclay ParisFrance

Poly[2-methoxy-5-（20-ethylhexyloxy）-io-phenylenevinylene] （MEH-PPV）, [6,6]-phenyl-C61-butyric acid methyl ester （PCBM） and titanium dioxide （TiO2） nanoparticles （n-type） were dissolved, mixed and deposited by physical methods （spin-coating） on indium tin-oxide （ITO） substrate. The incorporation of the titanium dioxide nanoparticles changed the morphology and increased the roughness of polymers film （MEH-PPV/PCBM）, and the photocurrent density of the composite （MEH-PPV/PCBM ＋n-TiO2） was higher than that of single MEH- PPV/PCBM film. The study showed that the presence of n-TiO2 particles in the polymeric film improves the photoelectrochemical properties of M EH-PPV/PCBM composite.

关键词： Photocurrent density Electrochemical property Hybrid coating Conducting polymer Titanium dioxide Organic nanostructures

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Influence des paramètres hydro-morphométriques sur l’écoulement des eaux des sous-bassins versants de la Tshopo,République démocratique du Congo Influence of Hydro-Morphometric Parameters on Water Flow in the Tshopo Sub-Catchments,democratic Republic of Congo

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Revue Internationale de géomatique 2023年第1期32卷 79-98页

作者： Faidance Mashauri Mokili Mbuluyo Nsalambi Nkongolo département de géologie Facultédes Sciences et TechnologiesUniversitéde l’UéléIsiroBP 670République démocratique du Congo département de Sciences du Sol et de l’Eau Institut Facultaire des Sciences Agronomiques(IFA)de YangambiKisanganiBP 1232République démocratique du Congo département de géologie Facultédes Sciences et TechnologiesUniversitéde KisanganiKisanganiBP 2012République démocratique du Congo geographic Information Technology Program School of ScienceNavajo Technical UniversityCrownpointNew MexicoUSA

The most characteristic hydro-morphometric parameters controlling water flow in the Tshopo catchment have not yet been *** analysis,multiple linear regression and hierarchical ascending classification were applied to all the data in order to identify the most characteristic variables that significantly influence water flow velocity,and to group together physically similar *** results highlight the importance of topography on water *** topographical variables,namely median altitude(H50),overall gradient(dg)and specific gradient(ds),have a significant influence(p-value≤0.05)on surface water flow velocity(Ve)in the Tshopo *** opposing groups(g1 and g2)of sub-catchments were identified,on the one hand the sub-catchments belonging to the upper and middle course of the Tshopo(SBV1,SBV2,SBV3 and SBV5)and on the other the sub-catchments of the lower course(SBV6,SBV7 and SBV8).The first group is characterized by moderate relief(ds ranging from 53.19 to 73.6 m),while the second group has low relief(ds ranging from 18.1 to 29.43 m).

关键词： Hydro-morphometric parameters correlation analysis multiple linear regression hierarchical ascending classification sub-catchments Tshopo river

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Existence of T-solution for degenerated Problem via Minty's Lemma

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Acta Mathematica Sinica,English Series 2008年第3期24卷 431-438页

作者： Y.AKdIME E.AZROUL M.RHOUdAF département de Mathématiques et Informatique Facultédes Sciences dhar-Mahraz B. P 1796 Atlas Fès Maroc

We study the existence result of solutions for the nonlinear degenerated elliptic problem of the form, -div（a（x, u,△↓u）） = F in Ω, where Ω is a bounded domain of R^N, N≥2, a ：Ω×R×R^N→R^N is a Carathéodory function satisfying the natural growth condition and the coercivity condition, but they verify only the large monotonicity. The second term F belongs to W^-1,p′（Ω, w^＊）. The existence result is proved by using the L^1-version of Minty＇s lemma.

关键词： weighted Sobolev spaces truncations L^1-version of Minty's lemma

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Utilisation du système d’information géographique et modèle numérique de terrain dans l’analyse des caractéristiques hydro-morphométriques des sous-bassins versants de la rivière Tshopo,République démocratique du Congo Use of geographic Information System and digital Elevation Model to Analyze the Hydro-Morphometric Characteristics of the Tshopo River Sub-Catchments,democratic Republic of Congo

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Revue Internationale de géomatique 2023年第1期32卷 99-122页

The analysis and quantification of hydro-morphometric characteristics are essential for better management of water resources and more effective planning of hydroelectric projects in the Tshopo ***,few studies have been carried out to assess these characteristics at the scale of this *** methodological approach consists of using geographic Information System(gIS)software analysis tools applied to the digital Elevation Model(dEM)derived from the Advanced Land Observing Satellite(ALOS)World 3d-30m *** enabled us to automatically extract the hydrographic network and generate the Tshopo *** results of this analysis show that the Tshopo catchment area is of the order of magnitude 7.A total of 8 sub-watersheds were identified,covering an area of around 19,335 *** are elongated in shape,with a coefficient of compactness(Kg)of between 1.84 and *** slopes are low,ranging from 0.84%to 3.58%.Run-off velocity is generally low,with a velocity range(Ve)of 2.3 to 4.79 km/*** duration of run-off concentration(Tc)varies between 30.2 and 70.2 h in the tributaries of the *** hydrographic network is dense,with drainage densities(dd)ranging from 0.91 to 1.72 km/*** watercourses form a homogeneous dendritic network,but with local *** some places,the network can take on a parallel or rectangular shape.

关键词： Morphometry dEM gIS hypsometry hydrographic network sub-catchments Tshopo river

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Physiological Responses of Pea Plants to Salinity and gibberellic Acid

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Phyton-International Journal of Experimental Botany 2023年第1期92卷 149-164页

作者： Houneida Attia department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia Laboratoire ProductivitéVégétale et Contraintes Environnementales Département des Sciences BiologiquesFacultédes Sciences de TunisUniversitéTunis El ManarTunis2092Tunisia

Pea is a seed *** is rich in cellulose fibre and *** is also a significant source of minerals and *** this paper,we set out to better characterize the physiological responses of Pisum sativum *** the combined effects of NaCl,100 mM and gibberellins(gA3).Our analysis revealed that NaCl caused a decrease in growth resulting in a reduction in root elongation,distribution and density,leaf number and leaf area,and a decrease in dry matter of roots and ***,the contribution of gA3 in the salty environment induced an increase in these different parameters suggesting an improving effect of this hormone on growth of pea in presence of *** also led to a disturbance of the photosynthetic ***,level of chlorophyll pigments(a and total)and photosynthetic activity were decreased compared to the control ***,the exogenous supply of gA3 restored this decrease in net CO_(2) assimilation,but not in chlorophyll *** analyses were performed on the effect of salinity/gA3 interaction on osmolytes(soluble sugars and starch).Our results showed an increase in sugars and a decrease in starch in the presence of 100 mM *** salt-gA3 combination resulted in compensation of soluble sugar contents but not of starch contents,suggesting a beneficial effect of gA3 under saline stress *** of three main polyamines putrescine,spermidine,and spermine increased significantly in all organs of salt-treated plants.

关键词： Pisum sativum L. salinity gibberellic acid growth sugars polyamines

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Influence of MBBR carrier geometrical properties and biofilm thickness restraint on biofilm properties,effluent particle size distribution,settling velocity distribution,and settling behaviour

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Journal of Environmental Sciences 2022年第12期34卷 138-149页

作者： Raheleh Arabgol Peter A.Vanrolleghem Robert delatolla department of Civil Engineering University of Ottawa161 Louis PasteurK1N 6N5 ONCanada ModelEAU Département de génie civil et de génie des eauxUniversitéLaval1065 av.de la MédecineQuébecCanada

The relatively poor settling characteristics of particles produced in moving bed biofilm reactor(MBBR)outline the importance of developing a fundamental understanding of the characterization and settleability of MBBR-produced *** influence of carrier geometric properties and different levels of biofilm thickness on biofilm characteristics,solids production,particle size distribution(PSd),and particle settling velocity distribution(PSVd)is evaluated in this *** analytical Vi CAs method is applied to the MBBR effluent to assess the distribution of particle settling *** method is combined with microscopy imaging to relate particle size distribution to settling *** conventionally loaded MBBR systems are studied at a similar loading rate of 6.0 g/(m^(2)·day)and with different carrier *** AnoxK^(TM)K5 carrier,a commonly used carrier,is compared to so-called thickness-restraint carriers,AnoxK^(TM)Z-carriers that are newly designed carriers to limit the biofilm ***,two levels of biofilm thickness,200μm and 400μm,are studied using AnoxK^(TM)Z-200 and Z-400 *** analysis confirms that K5 carriers demonstrated a significantly different biofilm mass,thickness,and density,in addition to distinct trends in PSd and PSVd in comparison with ***,in comparison of thickness-restraint carriers,Z-200 carrier results did not vary significantly compared to the Z-400 *** K5 carriers showed the lowest production of suspended solids(0.7±0.3 gTSS/day),thickest biofilm(281.1±8.7μm)and lowest biofilm density(65.0±1.5 kg/m^(3)).The K5 effluent solids also showed enhanced settling behaviour,consisting of larger particles with faster settling velocities.

关键词： MBBR Particle size distribution(PSd) Particle settling velocity distribution(PSVd) Settling behaviour ViCAs z-carriers

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