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Characterization of tunisian marine sediments in Rades and Gabes harbors

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International Journal of Sediment Research 2014年第3期29卷 391-401页

作者： Imen Bel HADJ ALI Zoubeir LAFHAJ Mounir BOUASSIDA Imen SAID Ecole Centrale de Lille Villeneuve d'AscqFrance and Ecole Nationale d'Ingenieurs de TunisTunisia Ecole centrale de Lille Villeneuve d'AscqFrance universite de tunis el manar/Ecole Nationale d'Ingenieurs de tunis/05-UR-11 06 universite de tunis el manar/Ecole Nationale d'Ingenieurs de tunis/05-UR-1106

The objective of this article is to study the geotechnical and environmental characteristics of sediments dredged from two tunisian harbors:Rades and *** first harbor represents the main facility place in the national transport *** second one is selected as its sediments present a serious ecological constraint caused by the discharge of wastes into the marine *** sediments are either discarded at sea or landfilled despite their harmful effects on the *** article is divided into three main *** first one presents the material that was carried for Rades and Gabes *** conservation conditions and the used experimental tests are *** characterization includes the determination of the grain size distribution,the water content,the Atterberg limits,the methylene blue value,the specific area,the bulk density,the specific unit weight,the organic and carbonate *** characterization is assessed by the determination of metals concentrations in a leaching *** second section deals with the description and analysis of geotechnical properties of Rades and Gabes harbors’ *** results obtained show that Rades harbor sediments are slightly sandy clayey silts whereas Gabes harbor sediments are silty sands characterized by a highly plastic clay *** of the two sediments don’t exhibit a high organic ***,chemical,mineralogical and environmental properties are presented and then *** experimental results obtained show that Rades and Gabes sediments could be used as a sand substitute in the formulation of a new construction *** harbor sediments are more polluted than Rades harbor sediments.

关键词： Sediments Characterization Geotechnical Environmental Valorization

ON THE FINITE MelLIN TRANSFORM IN QUANTUM CALCULUS AND APPLICATION

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Acta Mathematica Scientia 2018年第4期38卷 1393-1410页

作者： Bochra NEFZI Kamel BRAHIM Ahmed FITOUHI Faculty of Sciences of tunis University of Tunis El Manar

The aim of the present paper is to introduce and study a new type of q-Mellin transform [11], that will be called q-finite Mellin transform. In particular, we prove for this new transform an inversion formula and q-convolution product. The application of this transform is also earlier proposed in solving procedure for a new equation with a new fractional differential operator of a variational type.

关键词： q-Mellin transform finite Mellin transform fractional q-integral fractionalq-differential equation

A BIFURCATION PROBLEM ASSOCIATED TO AN ASYMPTOTICALLY LINEAR FUNCTION

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Acta Mathematica Scientia 2016年第6期36卷 1731-1746页

作者： Soumaya SAANOUNI Nihed TRABelSI department of Mathematics Faculty of Sciences of TunisUniversity of Tunis El Manar Higher Institut of Medicals Technologies of tunis University of Tunis El Manar

We study the existence of positive solutions to a two-order semilineav elliptic problem with Dirichlet boundary condition（Pλ）{-div（c（x）△u=λf（u）inΩ,u=0 on ЭΩ where ΩCR n 〉 2 is a smooth bounded domain; f is a positive, increasing and convex source term and c（x） is a smooth bounded positive function on Ω, We also prove the existence of critical value and claim the uniqueness of extremal solutions.

关键词： extremal solution regularity bifurcation stability

Calculation of electric field–temperature (E, T) phase diagram of a ferroelectric liquid crystal near the SmA–SmC_α~* transition

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Chinese Physics B 2018年第3期27卷 444-450页

作者： F Trabelsi H Dhaouadi O Riahi T Othman universite de tunis el-manar Faculte des Sciences de TunisLaboratoire de physique de la matiere molle et de modelisation electromagnetique(LP3ME)Campus Universitaire Farhat Hached 2092 Tunis Tunisie

In this work we perform a theoretical calculation in order to reconstitute the （E-T） phase diagram of a chiral smectic liquid crystal in the vicinity of the SmA-SmCα＊ transition. This reconstruction is carried out on the basis of a thermo-dynamic calculation of the slope of the curve joining the SmC＊ domain and the unwound SmC＊. An empiric correction of the mean field term of Landau de-Gennes development is necessary to accomplish this reconstruction. Thereafter, an experimental validation is performed to verify our calculations.

关键词： field-temperature phase diagram liquid orystal

electro-optical properties and(E,F) phase diagram of fluorinated chiral smectic liquid crystals

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Chinese Physics B 2018年第10期27卷 570-577页

作者： R Zgueb H Dhaouadi T Othman universite tunis el-manar Faculte des Sciences de Tunis Laboratoire de physique de la matiere molle et de modelisation electromagnetique (LP3ME) Campus Universitaire Farhat Hached 2092 Tunis Tunisie

Fluorinated smectic liquid crystals each with a biphenyl benzoate rigid core are investigated. Molecular structures of the studied compounds have difference only in fluorine position and the length of the carbon chain. Dielectric relaxation study and electro-optical measurements are carried out with the classical SSFLC geometry. The field-induced phase transitions are studied and the（E,T） phase diagram is established.

关键词： smectic liquid crystal dielectric relaxation electro-optical properties phase transition (E,T)phase diagram

Intracellular behaviour of samarium and europium in lactating mammary gland

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Journal of Rare Earths 2012年第3期30卷 274-277页

作者： Ayadi Ahlem Maghraoui Samira el Hili Ali Galle Pierre Tekaya Leila Laboratoire de physiologie Faculté de Médecine de Tunis. 15 rue Djebel lakhdhar. 1007 La Rabta. Tunis. Université Tunis El Manar Tunisie Laboratoire de microscopie électronique Faculté des Sciences de Tunis Campus universitaire 2092 El Manar II Tunis Université Tunis El Manar Tunisie. Université Tunis El Manar Tunisie Universidade Estdual de Santa Cruz CNPq rod. Ilheus-Itabuna Km. 16 Ilheus Ba. Brasil

The subcellular localization of samarium and europium, two rare-earths, increasingly used in both medical and industrial fields, has been studied in several organs such as liver and kidney but never in the mammary gland despite of its importance in the biology of lactation and nutrition domains. The intracellular behaviour of samarium and europium after their intra-peritoneal administration in the lactating mammary gland cells was investigated. The results showed the presence of very electron dense deposits in the glandular epithelial cell lysosomes. These particular lysosomes were never observed in the mammary cell lysosomes of control rats. These intralysosomal deposits were probably composed of insoluble samarium or europium phosphates by analogy with previous studies, the transmission electron microscopy, the ion mass microscopy and the electron probe microanalysis, and other techniques allowing the identification of the chemical structure of the intralysosomal deposits.

关键词： samarium europium transmission electron microscopy (TEM) lysosome mammary gland lactation rare earths

Quantitative Uncertainty Principles for the Canonical Fourier-Bessel Transform

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Acta Mathematica Sinica,English Series 2022年第2期38卷 331-346页

作者： Jihed SAHBANI Faculty of Sciences of tunis University of Tunis El Manar2092 TunisTunisia

The aim of this paper is to establish an extension of quantitative uncertainty principles and an algorithm for signal recovery about the essential supports related to a Bessel type of(LCT)so called canonical Fourier-B... 详细信息

关键词： Fourier-Bessel transform linear canonical transform quantitative uncertainty principles Donoho-Stark theorem algorithm for signal recovery

Formation of Nanotubular Structures with Petal Effect by Soft-Template electropolymerization of Benzotrithiophene with Hydrophilic Carboxyl Group

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Journal of Bionic Engineering 2022年第4期19卷 1054-1063页

作者： Maroua Khodja Imen Bousrih Mejda el Kateb Mohammed Beji Frederic Guittard Thierry Darmanin Laboratory of Structural Organic Chemistry Faculty of Sciences of Tunis University of Tunis El Manar2092 TunisTunisia NICE Lab Universite Cote d’Azur06100 NiceFrance

The bioinspiration is one of the best ways to make a breakthrough in a field,and particularly in the wetting *** by natural species,such as rose petals and gecko foot,and previous researches,nanotubular structures are prepared here by soft-template electropolymerization in organic solvent and using an original benzotrithiophene with a hydrophilic carboxyl group,as the *** best results are obtained by cyclic voltammetry because of a much higher amount of gas bubbles released with this deposition *** nanoparticles and nanotubes are observed while the water content has an influence on the number of *** if the monomer has hydrophilic carboxyl group,the best films have both high hydrophobicity(apparent water contact angle up to 130.7°)and strong water adhesion(petal effect).These surfaces could be used in future in applications such as water harvesting systems.

关键词： Bioinspired electropolymerization Hydrophobicity Nanostructures Nanotubes Wettability

Assessment of self- and cross-absorbed SAF values for HDRK-man using GEANT4 code: internal photon and electron emitters

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Nuclear Science and Techniques 2019年第10期30卷 40-47页

作者： Maroua Bhar Omrane Kadri Kais Manai Higher Institute of Medical Technologies of tunis Tunis El Manar UniversityTunisTunisia Nuclear Physics and High Energy Unit Faculty of Sciences of TunisTunis El Manar UniversityTunisTunisia

The ultimate need to account for the partial amount of energy deposited in target tissue/organ resulting from internal inhalation,ingestion,and injection intakes of radionuclides,defined by the Medical Internal Radiation Dosimetry committee as the specific absorbed fraction(SAF),has become *** this study,we assessed the SAF values for self-and cross-absorption,which were calculated for a uniform distribution of monoenergetic photon and electron emitters with energies ranging from 15 keV to 3 *** voxelized human phantom‘‘High-definition Reference Korean-man’’(HDRK-man),which was implemented using the Monte Carlo simulation code GEANT4(version 10.1),was used for several combinations of target–source *** results were compared to those of the International Commission on Radiological Protection Reference(ICRP133)and Zubal *** was found that the SAF values of the three models have a similar ***,the SAF values for the HDRK-man phantom were higher than those of the other two models,with a relatively good agreement with those for the ICRP133 phantom(differences of 13.9±2.8 and 12.1±3.2 for photon and electron emitters,respectively).To analyze the differences in SAF values,we calculated the chord length distributions(CLDs)for selected target–source *** parameters of organ mass(or volume)and CLDs,in addition to the adopted computational procedures,mainly cause such *** realistic radionuclide emission spectra,an overall overestimation was observed when computing the S values for three radiopharmaceuticals studied(I-131,In-111,and Lu-177)and for liver–spleen intra-and inter-organ absorption when compared with published *** new arrangement of S and SAF values is expected to add value for multidisciplinary research and clinical communities.

关键词： GEANT4 Monte Carlo simulation Internal dosimetry HDRK-man S and SAF values