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Unveiling the Residual Stresses,Local Micromechanical Properties and Crystallographic Texture in a Ti-6Al-4V Weld Joint

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Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 997-1006页

作者： B.Mehdi R.Badji V.Ji B.Alili D.Bradai W.Bedjaoui F.deschaux-Beaume F.Brisset Laboratoire de physique des Matériaux Facul téde PhysiqueUniversitéDes Sciences Et de La Technologie Houari Boumediene16111 AlgerAlgérie Research Center in Industrial Technologies CRTI P.O.Box64CheragaAlgeria ICMMO/SP2M UniversitéParis-Saclay LMGC University of MontpellierCNRSMontpellierFrance

In this work,the micromechanical properties,crystallographic texture,welding residual stresses and their evolution after plastic strain were investigated in a Ti-6Al-4V alloy tungsten inert gas weld *** was found that the welding process affected the Young modulus and microhardness values in bothαandβphases in the different regions of the weld *** highest microhardness and Young modulus values of a phase were recorded in the heat-affected zone,whereas the highest values of these characteristics for theβphase were found in the fusion zone(FZ).The change in the micro mechanical properties was accompanied by a change in the crystallographic texture components of the dominant a phase from(0001)and(11-20)components in the base material to(10-10)and(11-20)components in the *** introduction of tensile testing resulted in a continuous stress relaxation and improved the weld joint performances.

关键词： Ti-6Al-4 V Tungsten inert gas(TIG)weld Residual stress Local mechanical properties Crystallographic texture

Zn Doping Effect on Magnetic Properties of Znx Cdl-xCr2S4 Systems by High-Temperature Series Expansions

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Chinese Physics Letters 2007年第7期24卷 2077-2080页

作者： M. Hamedoun R. Masrour K. Bouslykhane A. Hourmatallah N. Benzakour A. Filali Laboratoire de physique du Solide Universite Sidi Mohammed Ben Abdellah Facult~ des sciences Dhar Mahraz BP 1796 Fes Morocco Equipe de physique du Solide Ecole Normale Superieure BP 5206 Bensouda Fes Morocco

The effect of Zn doping on the magnetic properties of CdCr2S4 systems is studied by mean field theory and high-temperature series expansion （HTSE）. The nearest neighbouring and the next-neighbouring super-exchange interactions Jl（x） and J2（x） are evaluated for the spinel system Zn, Cd1-xCr2S4 in the range 0 〈 x 〈 1. The intra-planar and the inter-planar interactions are deduced. The HTSE combined with the Padd approximant method （PA） is applied to the spinel system ZnxCdl-,Cr2S4. The magnetic phase diagram, i.e. Tc versus dilution x, is obtained. The critical exponents associated with the magnetic susceptibility 7 and the correlation length u are deduced. The obtained theoretical results are in agreement with the experimental data obtained by magnetic measurements.

关键词： Magnetic Properties High-Temperature HTSE

Field-induced phase transitions in chiral smectic liquid crystals studied by the constant current method

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Chinese Physics B 2016年第5期25卷 373-379页

作者： H Dhaouadi R Zgueb O Riahi F Trabelsi T Othman departement de physiqu Faculte des Sciences de Tunis Laboratoire de physique de la matiere molle et de modelisation electromagnetique (LP3ME) Universite Tunis Elmanar Campus universitaire 2092 Tunis Tunisia

In ferroelectric liquid crystals, phase transitions can be induced by an electric field. The current constant method allows these transition to be quickly localized and thus the（E, T） phase diagram of the studied product can be *** this work, we make a slight modification to the measurement principles based on this method. This modification allows the characteristic parameters of ferroelectric liquid crystal to be quantitatively measured. The use of a current square signal highlights a phenomenon of ferroelectric hysteresis with remnant polarization at null field, which points out an effect of memory in this compound.

关键词： chiral smectic liquid crystal constant current method ferroelectric polarization dielectric permittivity

Non-adiabatic approximations in time-dependent density functional theory: progress and prospects

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npj Computational Materials 2023年第1期9卷 1105-1119页

作者： Lionel Lacombe Neepa T.Maitra Laboratoire des solides Irradiés École PolytechniqueInstitut Polytechnique de ParisF-91128 PalaiseauFrance department of Physics Rutgers UniversityNewarkNJ 07102USA

Time-dependent density functional theory continues to draw a large number of users in a wide range of fields exploring myriad applications involving electronic spectra and *** in principle exact,the predictivity of the calculations is limited by the available approximations for the exchange-correlation *** particular,it is known that the exact exchange-correlation functional has memory-dependence,but in practise adiabatic approximations are used which ignore *** we review the development of non-adiabatic functional approximations,their impact on calculations,and challenges in developing practical and accurate memory-dependent functionals for general purposes.

关键词： dynamics adiabatic functional

Multilayer transition in a spin-1 Blume Capel model with RKKY interaction and quantum transverse anisotropy

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Chinese Physics B 2011年第1期20卷 609-615页

作者： N.Tahiri H.Ez-Zahraouy A.Benyoussef Computational Physics Group LMPHEDepartement de PhysiqueFaculte des SciencesUniversite Mohammed V-AgdalB.P.1014RabatMorocco

Using mean-field theory, we have studied the effect of quantum transverse anisotropies with RKKY interaction on the multi-layer transition and magnetic properties of the spin-1 Blume-Capel model of a system formed by two magnetic multi-layer materials, of different thicknesses, separated by a non-magnetic spacer of thickness M. It is found that the multilayer magnetic order-disorder transition temperature depends strongly on the value of the transverse anisotropy. The multilayer transition temperature decreases when increasing the transverse anisotropy. Furthermore, there exists a critical quantum transverse anisotropy △xL beyond which the separate transitions occur in the two magnetic layers. The critical transverse anisotropy AxL decreases （increases） on increasing the non-magnetic spacer of thickness M （on increasing the crystal field）, and AxL undergoes oscillations as a function of the Fermi level.

关键词： quantum transverse anisotropy order-disorder lavering transitions. RKKY interaction

SYNTHESIS OF SOLUBLE POLY(3,4-DIHYDROXY-o-TOLYLENE):REDOX POLYMER

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Chinese Journal of Polymer Science 2006年第1期24卷 41-46页

作者： Sad Moulay Fatima M'zyène Laboratoire de Chimie-physique Moléculaire et Macromoléculaire Faculté des Sciences de l'Ingénieur Département de Chimie Industrielle Université de BlidaRoute de SoumèaB.P.270Blida 09000Algeria. Laboratoire de Chimie-physique Moléculaire et Macromoléculaire Faculté des Sciences de l'Ingénieur Département de Chimie Industrielle Université de BlidaRoute de SoumaB.P.270Blida 09000Algeria.

Conventional chloromethylation, paraformaldehyde/hydrogen chloride in acetic acid medium, was applied to 1,2- dimethoxybenzene. Chloroform-soluble poly（3,4-dimethoxy-o-tolylene） was obtained with an intrinsic viscosity of 0.034 dL g^-1. The polymer was evaluated as a condensation redox polymer precursor formed by a Friedel-Crafts reaction. Cleavage of the methoxy groups present in this polymer resulted in poly（3,4-dihydroxy-o-tolylene） which manifested a great air-oxidation resistance. The redox property of the latter polymer was found to be 1017 mV by potentiometric titration with 0.05 N ceric ammonium nitrate at 25℃. This midpotential was compared to that of catechol, a monomeric analogue, under the same titration conditions.

关键词： Poly(3,4-dimethoxy-o-tolylene) Poly(3,4-dihydroxy-o-tolylene) Redox polymer.

Bunching and Antibunching in Cavity QED

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Communications in Theoretical Physics 2011年第7期56卷 134-138页

作者： H.Jabri H.Eleuch Dpartement de physique Facult des Sciences de Tunis Institute for Quantum Studies Texas A & M UniversityCollege Station Texas University of Carthage

We study the statistics of the emitted filed from Rydberg atom confined inside a microcavity and interacting with a pump laser in the strong coupling regime. We explore the manifestation of the antibunching in connect... 详细信息

关键词： quantum fluctuations quantum noise photon statistics cavity quantum electrodynamics

Exploring the impact of weak measurements on exciton-exciton interactions

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Communications in Theoretical Physics 2024年第11期76卷 42-47页

作者： Fatima-Zahra Siyouri Olivier Giraud Yassine Hassouni Equipe Sciences de la Matiere et du Rayonnement(ESMaR) Departement de PhysiqueFaculte des SciencesUniversite Mohammed VAgdalAv.Ibn BattoutaB.P.1014AgdalRabatMorocco Laboratoire de physique Theorique et Modeles Statistiques(LPTMS) Faculte des sciencesUniversite parissaclayParisFrance

In our study of super quantum discord between two excitonic qubits inside a coupled semiconductor quantum dots system,our primary focus is to uncover the impact of weak measurement on its quantum *** achieve this,we analyze how varying the measurement strength x,affects this super quantum correlation in the presence of thermal ***,we assess the effect of this variation on the system's evolution against its associated quantum parameters;external electric fields,exciton-exciton dipole interaction energy and F?rster *** findings indicate that adjusting x to smaller values effectively enhances the super quantum correlation,making weak measurements act as a *** adjustment ensures its robustness against thermal effects while preserving the non-classical attributes of the ***,our study unveils that the effect of weak measurements on this latter surpasses the quantum effects associated with the ***,manipulating the parameter x allows the weak measurement to function as a versatile tool for modulating quantum characteristics and controlling exciton-exciton interactions within the coupled semiconductor quantum dots system.

关键词： super quantum discord weak measurements measurement strength x semiconductor quantum dots exciton-exciton interactions

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