检索结果-南通市图书馆

Journal of Coastal Life Medicine 2016年第1期 39-44页

作者： fethi benbelaïd Abdelmounaïm Khadir Mourad Bendahou Fatima Zenati Chafika Bellahsene Alain Muselli Jean Costa Laboratory of Applied Microbiology in Food Biomedical and EnvironmentAboubekr Belkaïd UniversityP.O.Box 119Tlemcen 13000Algeria department of Biology University of Oran 1 Ahmed Ben BellaEs Senia OranAlgeria University of Corsica Team of Chemistry of Natural ProductsUMR-CNRS 6134Quartier GrossettiBP 52Corti 20250France

Objective:To evaluate the antimicrobial potency of Rosmarinus eriocalyx(***)essential oil and total polyphenols against pathogenic ***:Antimicrobial activity of *** extracts was assessed by disc diffusion method and minimum inhibitory concentrations *** oil obtained from endemic rosemary by hydrodistillation was analysed by gas chromatograph/retention index and gas chromatograph-mass ***:An interesting antimicrobial activity was shown by *** ***,constituted mainly by flavonoids,were the most effective extract with very low minimum inhibitory concentrations values,ranged between 0.06 and 8.00 mg/mL,while essential oil was less *** should be noted that antimicrobial activities of both *** extracts were more directed against fungi and Gram-positive bacteria than Gram-negative ones,in which Staphylococcus aureus,Enterococcus faecalis,and Candida albicans were the most sensitive *** chemical composition of *** essential oil,camphor(37.8%),1,8-cineole(17.4%),camphene(13.3%),and α-pinene(10.9%)were the major ***:The findings of the present study indicate that *** extracts possess significant bactericidal and fungicidal *** of its richness in essential oil,and especially flavonoids,*** may be a source for effective and safe antimicrobial agents.

关键词： Antimicrobial activity Essential oil Polyphenols Rosmarinus eriocalyx

MULTIPLIER OPERATORS ANd EXTREMAL FUNCTIONS RELATEd TO THE dUAL dUNKL-SONINE OPERATOR

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

Acta Mathematica Scientia 2013年第2期33卷 430-442页

作者： fethi SOLTANI Higher College of Technology and Informatics Street of the Employers 45Charguia 2 - 2035 TunisTunisia

We study the dual dunkl-Sonine operator tSk,e on Rd and give expression of tSk,t, using dunkl multiplier operators on Rd, Next, we study the extremal functions fλ, λ〉 0 related to the dunkl multiplier operators, and more precisely show that {fλ}λ〉0 converges uniformly to tSk,e（f） as λ→0 Certain examples based on dunkl-heat and dunkt-Poisson kernels are provided to illustrate the results.

关键词： dunkl transform dual dunkl-Sonine operator multiplier operators extremalfunction

OPTIMIZATION APPROACH FOR THE MONGE-AMPèRE EQUATION

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2018年第4期38卷 1285-1295页

作者： fethi BEN BELGACEM department of Mathematics Laboratoire EDP ( LRO3ESO4) Faculty of Sciences of Tunis 1060 Tunis Tunisia

In this paper, we introduce and study a method for the numerical solution of the elliptic Monge-Ampere equation with dirichlet boundary conditions. We formulate the Monge-Ampere equation as an optimization problem. The latter involves a Poisson Problem which is solved by the finite element Galerkin method and the minimum is computed by the conjugate gradient algorithm. We also present some numerical experiments.

关键词： elliptic Monge-Ampere equation gradient conjugate method finite element Galerkin method

Real-time stereo matching on CUdA using Fourier descriptors and dynamic programming

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2019年第1期5卷 59-71页

作者： Mohamed Hallek fethi Smach Mohamed Atri Faculty of Sciences of Monastir Technologies et services de l'information

Computation of stereoscopic depth and disparity map extraction are dynamic research topics.A large variety of algorithms has been developed,among which we cite feature matching, moment extraction, and image representation using descriptors to determine a disparity map. This paper proposes a new method for stereo matching based on Fourier descriptors. The robustness of these descriptors under photometric and geometric transformations provides a better representation of a template or a local region in the image. In our work, we specifically use generalized Fourier descriptors to compute a robust cost ***, a box filter is applied for cost aggregation to enforce a smoothness constraint between neighboring pixels. Optimization and disparity calculation are done using dynamic programming, with a cost based on similarity between generalized Fourier descriptors using Euclidean distance. This local cost function is used to optimize correspondences. Our stereo matching algorithm is evaluated using the Middlebury stereo benchmark; our approach has been implemented on parallel high-performance graphics hardware using CUdA to accelerate our algorithm, giving a real-time implementation.

关键词： generalized Fourier descriptors stereo matching dynamic programming CUdA

Finite difference analysis of an advance core pre-reinforcement system for Toulon's south tube

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2016年第5期8卷 703-713页

作者： fethi kitchah sadok benmebarek MN2I2S Laboratory Department of Civil and Hydraulic EngineeringBiskra UniversityBiskra 07000Algeria

The stability of shallow tunnels excavated in full face has been a major challenge to the scientific community for a long time. In recent years, new techniques based on the installation of a pre-reinforcement system ahead of the tunnel face were developed to control the deformations and surface settlements induced by the excavation and to ensure the sustainability of the tunnel in the long term. In this paper, a finite difference numerical simulation was conducted to study the behaviors and effects of two pre-reinforcement systems, i.e. the face bolting and the umbrella arch system installed in a section of southern Toulon tunnel in France. For this purpose, two approaches were taken and compared： a two-dimensional （2d） approach based on the convergence–confinement method, and a three-dimensional （3d） approach taking into account the complete modeling of the tunnel. A 2d numerical back-analysis was performed to identify the geomechanical parameters that offer satisfactory agreement with the measurement results. The limit of this method lies in the exact choice of the stress relaxation ratio λ. To overcome this uncertainty, a 3d model was developed, which permitted to study the influence of different pre-support systems on the reaction of ground mass. Both 2d and 3d numerical approaches have been fitted to measurements recorded in a section of the Toulon tunnel and the very satisfactory correspondence has allowed validating the simulations. The results show that the 3d numerical analysis with a full discretization of the inclusions seems unquestionably the most reliable approach.

关键词： Face bolting Numerical modeling Pre-reinforcement Stress relaxation ratio Umbrella arch

Laeng-Morpurgo-Type Uncertainty Inequalities for the Laguerre Transform

在线全文

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2022年第1期42卷 8-14页

作者： fethi SOLTANI Faculté des Sciences de Tunis Laboratoire d’Analyse Mathématique et Applications LR11ES11Université de Tunis El Manar Ecole Nationale d’Ingénieurs de Carthage Université de Carthage

In this work,we prove Clarkson-type and Nash-type inequalities for the Laguerre transform■ on M=[0,∞)×*** combining these inequalities,we show Laeng-Morpurgo-type uncertainty *** establish also a local-type uncertainty inequalities for the Laguerre transform ■,and we deduce a Heisenberg-Pauli-Weyl-type inequality for this transform.

关键词： Laeng-Morpurgo-type inequality local-type inequality Heisenberg-Pauli-Weyl-type inequality

dunkl Multiplier Operators on a Class of Reproducing Kernel Hilbert Spaces

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2016年第6期36卷 689-702页

作者： fethi SOLTANI department of Mathematics Faculty of ScienceJazan University

We study some class of dunkl multiplier operators;and we establish for them the Heisenberg-Pauli-Weyl uncertainty principle and the donoho-Stark’s uncertainty *** these operators we give also an application of the th... 详细信息

关键词： Sobolev-dunkl spaces dunkl multiplier operators Heisenberg-Pauli-Weyl uncertainty principle donoho-Stark uncertainty principle Tikhonov regularization extremal functions

Uncertainty Principles for the Segal-Bargmann Transform

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2017年第5期37卷 563-576页

作者： fethi SOLTANI department of Mathematics Faculty of Science Jazan University

We recall some properties of the Segal-Bargmann transform; and we establish for this transform qualitative uncertainty principles: local uncertainty principle, Heisenberg uncertainty principle, donoho-Stark’s uncerta... 详细信息

关键词： Segal-Bargmann space Segal-Bargmann transform local uncertainty principle Heisenberg uncertainty principle donoho-Stark’s uncertainty principle

Inversion Formula for the dunkl-Wigner Transform and Compactness Property for the dunkl-Weyl Transforms

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Mathematical Research with Applications 2015年第4期35卷 425-434页

作者： fethi SOLTANI department of Mathematics Faculty of ScienceJazan University

We define and study the Fourier-Wigner transform associated with the dunkl operators,and we prove for this transform an inversion ***,we introduce and study the Weyl transforms W;associated with the dunkl operators,where cr is a symbol in the Schwartz space S（R;×R;）.An integral relation between the precedent Weyl and Wigner transforms is *** last,we give criteria in terms of σ for boundedness and compactness of the transform W;.

关键词： dunkl transform dunkl-Wigner transform dunkl-Weyl transforms inversion formula boundedness and compactness

Spectroscopic studies and Rietveld refinement of strontium-britholites

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2008年第4期26卷 483-489页

作者： Khaled Boughzala Ezzedine Ben Salem fethi Kooli Pierre Gravereau Khaled Bouzouita U. R. Matériaux Inorganiques Institut Préparatoire aux Etudes d'Ingénieurs Rue Ibn ElJazzr 5019 Monastir Tunisia department of Chemistry Taibah University P.O.Box 30002. Almadinah Almunawwarah Saudi Arabia 87 Avenue du Dr Schweitzer 33608 Pessac Cedex France

Strontium-britholites whose chemical formula was Sr10-xLax（PO4）6-x（SiO4）xF2, where x=0, 1, 2, and 4 were prepared by solid state reaction. The structural refinement carried out using the Rietveld method indicated that La^3＋ ions were located into the two sites with a strong preference for metal （2） sites especially for low contents. A progressive shift of the F position along the c-axis outside the centre of the triangle formed by metal （2）-atoms was observed with the increase of x. The infrared and Raman spectra exhibited the characteristic vibration modes of PO4 and SiO4groups confirming the incorporation of this last group into the apatite structure. The 295i MAS-NMR spectra exhibited one resonance peak confirming the data obtained by X-ray diffraction, indicating that P and Si were located in the same crystallographic site.

关键词： strontium brithofites Rietveld refinement infrared spectroscopy nuclear magnetic resonance (NMR) Raman spectroscopy rare earths