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Microwave Transmission Through One-Dimensional Hybrid Quasi-Regular （Fibonacci and Thue-Morse）/ Periodic Structures

Photonic Sensors 2013年第3期3卷 246-255页

作者： Youssef TRABELSI Naim BENALI Yassine BOUAZZI Mounir KANZARI LPMS Laboratory of Photovoltaic and Semi-conductor Materials ENIT EL Manar University ENIT-BP 37 Belvedere 1002 Tunis Tunisia

The transmission properties of hybrid quasi-periodic photonic systems （HQPS） made by the combination of one-dimensional periodic photonic crystals （PPCs） and quasi-periodic photonic crystals （QPCs） were theoretically studied. The hybrid quasi-periodic photonic lattice based on the hetero-structures was built from the Fibonacci and Thue-Morse sequences. We addressed the microwave properties of waves through the one-dimensional symmetric Fibonacci, and Thue-Morse system i.e., a quasi-periodic structure was made up of two different dielectric materials （Rogers and air）, in the quarter wavelength condition. It shows that controlling the Fibonacci parameters permits to obtain selective optical filters with the narrow passband and polychromatic stop band filters with varied properties which can be controlled as desired. From the results, we presented the self-similar features of the spectra, and we also presented the fractal process through a return map of the transmission coefficients. We extracted powerfully the band gaps of hybrid quasi-periodic multilayered structures, called ＂pseudo band gaps＂, often containing resonant states, which could be considered as a manifestation of numerous defects distributed along the structure. The results of transmittance spectra showed that the cutoff frequency could be manipulated through the thicknesses of the defects and the type of dielectric layers of the system. Taken together, the above two properties provide favorable conditions for the design of an all-microwave intermediate reflector.

关键词： Photonic crystals aperiodic sequence quasi-periodic photonic band gap Thue-Morse class quasi-periodic Fibonacci class quasi-periodic microwave reflector

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Optical Constant and Electrical Resistivity of Annealed Sn3Sb2S6 Thin Films

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Acta Metallurgica Sinica(English Letters) 2016年第3期29卷 287-294页

作者： Y.Fadhli A.Rabhi M.Kanzari Laboratoire de Photovoltaique et Materiaux Semi-conducteurs-enit BP 37 Le belvedere 1002 Tunis Tunisia Laboratoire de Photovoltaiques et Materiaux Semi-conducteurs-enit-IPEITunis Montfleury Universite de Tunis Tunis Tunisia

In this study,we report the annealing effects on the physical properties of Sn_3Sb_2S_6 thin ***_3Sb_2S_6 thin films were prepared onto non-heated glass substrates via thermal evaporation *** as-deposited films were annealed in air for 1 h in the temperature range from 100 to 300 °C.X-ray diffraction results show that the crystallinity of the thin films increased after *** microstructure parameters crystallite size,dislocation density,lattice strain and stacking fault probability were *** optical properties were obtained from the analysis of the experimental recorded transmittance and reflectance spectral data over the wavelength range 300–1800 *** absorption coefficient（10~5cm^（-1）） reached to the visible and near-IR spectral range.A decrease in optical band gap from 1.92 to 1.71 e V by increasing the air annealing temperature was *** energy E_o and dispersion energy E_d of the films after annealing were estimated according to the model of Wemple–Di Domenico single ***–Fan model was applied to determine the electron free carrier susceptibility and the ratio of carrier concentration to the effective *** layers annealed at temperatures 〉150 ℃ undergo abrupt changes in their electrical properties and exhibit a resistive hysteresis *** properties confer to the material interest perspectives for its application in diverse advanced technologies such as photovoltaic applications and optical storage.

关键词： Thin films Sn_3Sb_2S_6 Optical constants Resistivity Hysteresis

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Time and Quantity Based Hybrid Consolidation Algorithms for Reduced Cost Products Delivery

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Computers, Materials & Continua 2021年第10期69卷 409-432页

作者： Muhammad Ali Memon Asadullah Shaikh Adel Sulaiman Abdullah Alghamdi Mesfer Alrizq Bernard Archimède Department of Information Technology University of SindhJamshoroSindh76090Pakistan College of Computer Science and Information Systems Najran UniversityNajran61441Saudi Arabia University of Toulouse INP-ENIT47 Avenue d’AzereixBP1629F-65016Tarbes CedexFrance

In today’s competitive business environment,the cost of a product is one of the most important considerations for its *** are heavily involved in research strategies to minimize the cost of elements that can impact on the final price of the *** is one such *** products arrive from diverse locations to consumers in today’s digital era of online ***,the logistics sector faces several dilemmas from order attributes to environmental changes in this *** has specially been noted during the ongoing Covid-19 pandemic where the demands on online businesses have increased several ***,the methodology to optimise delivery cost and its impact on environmental focus by reducing CO_(2) emissions has gained *** resultant strategy of Shipment Consolidation that has evolved is an approach that combines one or more transport orders in the same vehicle for *** Consolidation has been categorized in three order scheduling approaches:Time based consolidation,Quantity based consolidation,and a Hybrid(Time-Quantity)based *** this paper,a new Hybrid Consolidation approach is *** the Hybrid approach,it has been shown that order delivery can be facilitated by taking into account not only the order pick up time,but also the total order *** results have shown that if a time window is available in respect of the order delivery time,then the order can be delayed from pickup to consolidate it with other orders for cost *** hybrid approach is based on four consolidation principles,two of which work on fixed departure and two,on demand *** of these rules have been implemented and tested here with an application case *** analysis of the results is illustrated with different planning evaluation *** Result analyses indicate that consolidation of orders is increased with each implemented rule hence motivating us towards t

关键词： Consolidation transportation supply chain cost minimization

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Structural Morphological and Optical Properties of SnSb_2S_4 Thin Films Grown by Vacuum Evaporation Method

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Journal of Materials Science & Technology 2014年第10期30卷 1006-1011页

作者： N.Khedmi M.Ben Rabeh M.Kanzari Laboratoire de Photovoltaques et Matriaux de Semi-conducteurs-enit-Universit de Tunis el Manar BP 37le belvedere1002 TunisTunisie Laboratoire de Photovoltaques et Matriaux de Semi-conducteurs-enit-IPEITunis Montfleury-Universit de Tunis Tunisie

SnSb2S4 thin films were prepared from powder by thermal evaporation under vacuum of 1.33 × 10^-4 Pa （ 10^-6 Torr） on unheated glass substrates. The effect of thickness on the structural, morphological and optical properties of SnSb2S4 thin films was investigated. Films thickness measured by interference fringes method varied from 50 to 700 nm. X-ray diffraction analysis revealed that all the SnSb2S4 films were polycrystalline in spite without heating the substrates and the crystallinity was improved with increasing film thickness. The microstructure parameters： crystallite size, strain and dislocation density were calculated. It was observed that the crystallite size increased and the crystal defects decreased with increasing film thickness. In addition, by increasing the film thickness, an enhancement in the surface roughness root-mean-square （RMS） increased from 2.0 to 6.6 nm. The fundamental optical parameters like band gap, absorption and extinction coefficient were calculated in the strong absorption region of transmittance and reflectance spectrum. The optical absorption measurements indicated that the band （Eg） gap of the thin films decreased from 2.10 to 1.65 eV with increasing film thickness. The refractive indexes were evaluated in transparent region in terms of envelope method, which was suggested by Swanepoul. It was observed that the refractive index increased with increasing film thickness.

关键词： Ternary system Thermal evaporation technique Thin films Thickness Atomic force microscopy (AFM)

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Water extraction kinetics of metals, arsenic and dissolved organic carbon from industrial contaminated poplar leaves

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Journal of Environmental Sciences 2013年第12期25卷 2451-2459页

作者： Muhammad Shahid Tiantian Xiong Maryse Castrec-Rouelle Tibo Leveque Camille Dumat Department of Environmental Sciences COMSATS Institute of Information Technology University of Toulouse INP-ENSATAv of Agrobiopole UMR 5245 CNRS-inp-UPS EcoLab UMR 7618 BioEmco UPMC-Paris 6

In industrial areas, tree leaves contaminated by metals and metalloids could constitute a secondary source of pollutants. In the present study, water extraction kinetics of inorganic elements （IE： Pb, Zn, Cd, As, Fe and Mn）, dissolved organic carbon, pH and biological activity were studied for industrial contaminated poplar leaves. Moreover, the distribution of the IE through the size fractions of the associated top soil was measured. High quantities ofMn, Zn and As and polysaccharides were released in the solution from the strongly contaminated leaves. The kinetic of release varied with time and metal type. The solution pH decreased while dissolved organic contents increased with time after 30 days. Therefore, these contaminated leaves could constitute a source of more available organic metals and metalloids than the initial inorganic process particles. However, the distribution of the IE through the size fractions of the top soil suggested that a great part of the released IE was adsorbed, reducing in consequence their transfers and bioavailability. It＇s concluded that mobility/boioavailability and speciation of metals and metalloids released from the decomposition of polluted tree leaves depends on soil characteristics, pollutant type and litter composition, with consequences for environmental risk assessment.

关键词： metals and metalloids dissolved organic carbon litter decomposition kinetics speciation water extraction

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A dynamical approach to generate chaos in a micromechanical resonator

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Microsystems & Nanoengineering 2021年第1期7卷 161-171页

作者： Martial Defoort Libor Rufer Laurent Fesquet Skandar Basrour Univ.Grenoble Alpes CNRSGrenoble INPTIMA38000 GrenobleFrance

Chaotic systems,presenting complex and nonreproducible dynamics,may be found in nature,from the interaction between planets to the evolution of weather,but can also be tailored using current technologies for advanced signal ***,the realization of chaotic signal generators remains challenging due to the involved dynamics of the underlying *** this paper,we experimentally and numerically present a disruptive approach to generate a chaotic signal from a micromechanical *** technique overcomes the long-established complexity of controlling the buckling in micro/nanomechanical structures by modulating either the amplitude or the frequency of the driving force applied to the resonator in the nonlinear *** experimental characteristic parameters of the chaotic regime,namely,the Poincarésections and Lyapunov exponents,are directly comparable to simulations for different *** results confirm that this dynamical approach is transposable to any kind of micro/nanomechanical resonator,from accelerometers to *** demonstrate a direct application exploiting the mixing properties of the chaotic regime by transforming an off-the-shelf microdiaphragm into a true random number generator conforming to the National Institute of Standards and Technology *** versatility of this original method opens new paths to combine the unique properties of chaos with the exceptional sensitivity of microstructures,leading to emergent microsystems.

关键词： chaotic chaos dynamical

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Determination and Analysis of Optical Constant of Annealed Sn_2Sb_2S_5 Thin Films

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Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 656-662页

作者： Yousra Fadhli Adel Rabhi Mounir Kanzari Laboratoire de Photovoltaque et Matriaux Semi-Conducteurs ENIT BP 37 Le belvdère 1002 Tunis Tunisia

The effects of annealing on structural, optical and electrical properties of Sn2Sb2S5 thin films were studied. Sn2Sb2S5 thin films were deposited on no-heated glass substrates by single source vacuum evaporation method. The as- deposited films were annealed in air for 1 h at 100, 200 and 300 ℃. XRD study shows that annealed films are crystallized according to the preferential orientation （602）. Optical measurements show that the thin films have relatively high absorption coefficients in the range of 10s-106 cm-1 in the energy range of 2-3.25 eV. It is also found that Sn2Sb2S5 exhibit two optical direct transitions. The models of Wemple-DiDomenico and Spitzer-Fan were applied for the analysis of the dispersion of the refractive index and the determination of the optical and dielectric constants. The electrical resistivity measurements are recorded, and two activation energy values are determined. The layers annealed at 200 and 300 ℃ exhibit a resistive hysteresis behavior. The properties reported here offer perspective to Sn2SbES5 for its application in many advanced technologies.

关键词： Sn2Sb2S5 thin films Optical constants Electrical properties

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Atomic-scale structural signature of dynamic heterogeneities in metallic liquids

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npj Computational Materials 2017年第1期3卷 179-188页

作者： Alain Pasturel Noel Jakse University Grenoble Alpes CNRSGrenoble INPSIMaPF-38000 GrenobleFrance

With sufficiently high cooling rates,liquids will cross their equilibrium melting temperatures and can be maintained in a metastable undercooled state before *** of undercooled liquids reveal several intriguing dynamic phenomena and because explicit connections between liquid structure and liquids dynamics are difficult to identify,it remains a major challenge to capture the underlying structural link to these *** initio molecular dynamics(AIMD)simulations are yet especially powerful in providing atomic-scale details otherwise not accessible in *** the AIMD-based study of Cr additions in Al-based liquids,we evidence for the first time a close relationship between the decoupling of component diffusion and the emergence of dynamic heterogeneities in the undercooling *** addition,we demonstrate that the origin of both phenomena is related to a structural heterogeneity caused by a strong interplay between chemical short-range order(CSRO)and local fivefold topology(ISRO)at the short-range scale in the liquid phase that develops into an icosahedral-based medium-range order(IMRO)upon ***,our findings reveal that this structural signature is also captured in the temperature dependence of partial pair-distribution functions which opens up the route to more elaborated experimental studies.

关键词： structural dynamic signature

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Stability of highly supersaturated vanadium electrolyte solution and characterization of precipitated phases for vanadium redox flow battery

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Journal of Energy Chemistry 2021年第10期30卷 436-445,I0012页

作者： Waldemir M.Carvalho Jr Laurent Cassayre Delphine Quaranta Fabien Chauvet Ranine El-Hage Theodore Tzedakis Béatrice Biscans Laboratoire de Génie Chimique Universitéde ToulouseCNRSINPUPSToulouseFrance

The vanadium redox flow battery(VRFB)has been receiving great attention in recent years as one of the most viable energy storage technologies for large-scale ***,higher concentrations of vanadium species are required in the H_(2)O-H_(2)SO_(4) electrolyte in order to improve the VRFB energy *** might lead to unwanted precipitation of vanadium compounds,whose nature has not been accurately characterized *** this purpose,this study reports the preparation ofⅤ^((Ⅱ)),ⅤV^((Ⅲ)),Ⅴ^((Ⅳ))andⅤ^((Ⅴ))supersaturated solutions in a 5 M H_(2)SO_(4)-H_(2)O electrolyte by an electrolytic method,from the only vanadium sulfate compound commercially available(VOSO_(4)).The precipitates obtained by ageing of the stirred solutions are representative of the solids that may form in a VRFB operated with such supersaturated *** solid phases are identified using thermogravimetric analysis,X-ray diffraction and *** report that dissolvedⅤ^((Ⅱ)),Ⅴ^((Ⅲ))andⅤ^((Ⅳ))species precipitate as crystals of VSO_(4),V_(2)(SO_(4))3 and VOSO_(4) hydrates and not in their anhydrous form;conversely V^((Ⅴ))precipitates as an amorphous V_(2) O_(5) oxide partially *** measured hydration degrees(respectively 1.5,9,3 and 0.26 mol of H_(2)O per mol of compound)might significantly affect the overall engineering of VRFB operating with high vanadium concentrations.

关键词： Vanadium Redox Flow Batteries Supersaturated electrolyte Precipitation Vanadium sulfate Vanadium hydrates

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Experiment/simulation correlation-based methodology for metallic ballistic protection solutions

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Defence Technology（防务技术） 2023年第11期29卷 24-38页

作者： Yohan Cosquer Patrice Longère Olivier Pantalé Claude Gailhac DGA-Techniques Aéronautiques 31130BalmaFrance Institut Clement Ader Universite de ToulouseISAE-SUPAEROIMT Mines AlbiUPSINSACNRS3RueCarolineAigle31400ToulouseFrance Laboratoire Genie de Production INP/ENITUniversitéde Toulouse47Avenued’AzereixF-65016TarbesFrance CNIM Systemes Industriels 83500 La Seyne-sur-MerFrance

A methodology is developed based on the coupling of a finite element code with an optimisation module for the design of land vehicle armouring composed of lightweight aluminium alloy and high strength steel *** an experiment/simulation correlation,a numerical model has been built and calibrated considering monolithic plates and then verified considering a bi-metal protection against tungsten carbide projectile mimicking the core of a 7.62×51 AP8 *** addition,a method is proposed to obtain the v_(res)-v_(i) curve for the full 7.62×51 AP8 bullet from the v_(res)-v_(i) curve obtained from the core only.

关键词： Impact Terminal ballistics Ballistic limit MARS380 Aluminium alloy 7.62×51 AP8

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