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FlowBreakdown of Hybrid Nanofluid on a Rigid Surface with Power Law Fluid as Lubricated Layers

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Computer Modeling in Engineering & Sciences 2024年第2期138卷 1485-1499页

作者： Mirza Naveed Jahangeer Baig NadeemSalamat Sohail Nadeem NaeemUllah mohamed Bechir ben Hamida Hassan ali Ghazwani Sayed M.Eldin A.S.Al-Shafay Instituite of Mathematics Khwaja Fareed University of Engineering and Information TechnologyRahim yar Khan64200Pakistan Department of Mathematics Quaid-I-Azam UniversityIslamabad44000Pakistan Department of Mathematics Wenzhou UniversityWenzhou325035China College of Engineering Department of Mechanical EngineeringImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11564Saudi Arabia Research Laboratory of Ionized Backgrounds and Reagents Studies(EMIR) Preparatory Institute for Engineering Studies of Monastir(IPEIM)University of MonastirMonastir5060Tunisia Higher School of Sciences and Technology of Hammam Sousse Department of PhysicsJazan82511Kingdom of Saudia Arabia Department of Mechanical Engineering Faculty of engineeringJazan UniversityP.O.Box 45124JazanKingdom of Saudia Arabia Center of Research Faculty of EngineeringFuture University in EgyptNew Cairo11835Egypt Department of Mechanical Engineering College of EngineeringPrince Sattam bin Abdulaziz UniversityAlkharj16436Saudi Arabia

Thiswork investigates an oblique stagnation point flowof hybrid nanofluid over a rigid surface with power lawfluidas lubricated layers. Copper (Cu) and Silver (Ag) solid particles are used as hybrid particles acting in water H2O asa base fluid. The mathematical formulation of flow configuration is presented in terms of differential systemthat isnonlinear in nature. The thermal aspects of the flow field are also investigated by assuming the surface is a heatedsurface with a constant temperature T. Numerical solutions to the governing mathematical model are calculatedby the RK45 algorithm. The results based on the numerical solution against various flow and thermal controllingparameters are presented in terms of line graphs. The specific results depict that the heat flux increases over thelubricated-indexed parameter.

关键词： Oblique stagnation point flow hybrid nanofluid lubricated layer magnetohydrodynamics

Outcome of Nurses with Occupational Dermatitis

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Open Journal of Nursing 2024年第6期14卷 239-251页

作者： Amira Omrane Chayma Harrathi Asma Kheder Maher Maoua Malek ben Abdelkader Taoufik Khalfallah Najib Mrizak mohamed Akrout mohamed Adnene Henchi Hichem Bel Hadj ali Department of Occupational Medicine and Ergonomics Taher Sfar Teaching Hospital Mahdia Tunisia Department of Occupational Medicine Houcine Bouzaiene Teaching Hospital Gafsa Tunisia Department of Occupational Medicine Farhat Hached Teaching Hospital Sousse Tunisia Department of Occupational Medicine and Ergonomics Fattouma Bourguiba Teaching Hospital Monastir Tunisia Department of Dermatology Fattouma Bourguiba Teaching Hospital Monastir Tunisia

Background: Occupational dermatitis is considered as the second most common occupational disease. It accounts for 25% of all lost workdays. Several international studies reported a prevalence of occupational dermatitis in healthcare workers between 17% and 55%. This study aims to identify factors that affect the professional outcome of nurses suffering from occupational dermatitis. Methods: This was a multicenter cross-sectional study concerning nurses declared having occupational dermatitis in the central region of Tunisia. A synoptic sheet related to socio-professional and administrative data was completed. A self-administered Questionnaire going over medical and occupational characteristics was completed during a direct interview. Results: The study involved forty nurses working in four public hospitals in the center of Tunisia. Only 37 workers were included in the study. A professional reclassification was introduced among 19 workers (51% of study population). Work-station adaptation was requested in 14 cases (38%). Exposure to allergens in the workplace was eliminated in 20 cases. Two study participants were transferred to other departments (5.4%) and three people retired (8.1%). A statistically significant association was found between professional reclassification and a history of allergic manifestations (p = 0.003). Similarly, a significant association was found between professional reclassification and the allergic agent (p = 0.014). Workstation layout was significantly associated with a history of allergic manifestations (p = 0.039), the palm hand location (p = 0.04), professional eviction (p Conclusion: This study identified the main factors influencing the occupational outcome of nurses suffering from occupational dermatitis. This outcome depended on a history of atopy (especially allergic rhinitis) and sensitization to allergens (thiuram mix).

关键词： Nursing Occupational Dermatitis Hospital

Experimental Testing of Cellular Construction Materials Containing Flax Particles

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Fluid Dynamics & Materials Processing 2023年第3期19卷 723-741页

作者： Hamadou-ali mohamed benazzouk Amar Haïkel ben Hamed Arash Jamali Laboratoire des Technologies Innovantes(UR-UPJV 3899)-UPJV Amiens80000France Plateforme de Microscopie Electronique-UPJV HUB de l’Energie80039Amiens

The feasibility of a sustainable non-autoclaved cellular concrete,based on flax vegetable co-products,for the production of usable specimen in the lightweight construction field,has been investigated *** produced specimen,containing various volume ratios of flax particles with respect to preformulatd Tradical PF70 lime binder of 0,1,and 2,were lightened by creating a porous structure in the matrix through the addition of 0.3%*** powder(able to react with calcium hydroxide from the binder and result in microscopic air-bubbles).Fresh and hardened specimen properties,including hydration,fresh density,porosity,hardened density,compressive and flexural strengths,toughness energy,and dry thermal conductivity at different temperatures,were assessed for varying flax-to-binder *** have shown that the addition of Aluminum powder leads to restrain the setting time delay of binder-based ***,the hardened material displays a significant decrease in specimen density,thereby resulting in a compressive strength level compatible with that required in the cellular construction materials *** also highlighted the ability of added flax to induce a change in the specimen from brittle to ductile ***,a high degree of thermal insulation can be achieved,which makes the cellular specimen based on flax particle suitable as insulated-bearing walls material.

关键词： Flax particles cellular concrete lightening porous structure physico-mechanical properties thermal conductivity

Practical stabilization of a class of uncertain time-varying nonlinear delay systems

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控制理论与应用（英文版） 2009年第2期7卷 175-180页

作者： Bassem ben HAMED mohamed ali HAMMAMI Institut Supérieur des Sciences Appliquées et de Technologie de Gabès Département de MathématiquesRue Amor Ben El Khatab 6029 GabèsTunisia Faculté des Sciences de Sfax Département de Mathématiques BP 802 Route Soukra km 4 Sfax 3018Tunisia

In this paper we deal with a class of uncertain time-varying nonlinear systems with a state delay. Under some assumptions, we construct some stabilizing continuous feedback, i.e. linear and nonlinear in the state, which can guarantee global uniform exponential stability and global uniform practical convergence of the considered system. The quadratic Lyapunov function for the nominal stable system is used as a Lyapunov candidate function for the global system. The results developed in this note are applicable to a class of dynamical systems with uncertain time-delay. Our result is illustrated by a numerical example.

关键词： Nonlinear system Time-delay Feedbacks Practical convergence Lyapunov function

Cooperative Answering of Fuzzy Queries

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Journal of Computer Science & Technology 2009年第4期24卷 675-686页

作者： Narjes Hachani mohamed ali ben Hassine Hanene Chettaoui Habib Ounelli Department of Computer Sciences Faculty of Sciences of Tunis University Campus Tunis 1060 Tunisia

The majority of existing information systems deals with crisp data through crisp database systems. Traditional Database Management Systems （DBMS） have not taken into account imprecision so one can say there is some sort of lack of flexibility. The reason is that queries retrieve only elements which precisely match to the given Boolean query. That is, an element belongs to the result if the query is true for this element; otherwise, no answers are returned to the user. The aim of this paper is to present a cooperative approach to handling empty answers of fuzzy conjunctive queries by referring to the Formal Concept Analysis （FCA） theory and fuzzy logic. We present an architecture which combines FCA and databases. The processing of fuzzy queries allows detecting the minimal reasons of empty answers. We also use concept lattice in order to provide the user with the nearest answers in the case of a query failure.

关键词： cooperative system database empty answer formal concept analysis fuzzy query

Nonlinear Coordinated Passivation Control of Single Machine Infinite Bus Power System with Static Var Compensator

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1557-1565页

作者： Salma Keskes Souhir Salleem Larbi Chrifi-Alaoui mohamed ben ali Kammoun Electric Machines and Power Networks Control Laboratory from the Electrical Engineering Department National Engineering School of Sfax Innovative Technologies Laboratory University of Picardy Jules Verne

We propose a nonlinear coordinated control of the generator excitation and the static var compensator(SVC) in order to enhance the transient stability and voltage regulation of power system by the passivation approach. SVC is installed in the middle of the transmission line of power system and consists of a single machine infinite bus(SMIB) system. The design of the proposed controller consists of two parts. On one hand,the generator excitation controller is designed based on a backstepping controller. On the other hand, the conception of SVC control input is based on the coordinated passivation approach,which can guarantee the asymptotic stability of the closed-loop system. The simulation results show the effectiveness of the proposed controller compared with other methods, which ensures better performance than the uncoordinated control when the system is subjected to a disturbance.

关键词： Coordinated control passivation approach transient stability control design

Monitoring the variation of soil quality with sewage sludge application rates in absence of rhizosphere effect

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International Soil and Water Conservation Research 2020年第3期8卷 245-252页

作者： Rahma Inès Zoghlami Helmi Hamdi Sonia Mokni-Tlili Sarra Hechmi mohamed Naceur Khelil Nadhira ben aissa mohamed Moussa Habib Bousnina Saoussen benzarti Naceur Jedidi Arid Regions Institute University of GabèsMèdenine4119Tunisia Water Research and Technology Center University of CarthageP.O.Box 273Soliman8020Tunisia Center for Sustainable Development College of Arts and SciencesQatar UniversityP.O.Box 2713DohaQatar National Institute for Research in Rural Engineering Water and ForestryP.O.Box 10Ariana2080Tunisia National Institute of Agronomy 43 Av.Charles NicolleTunis1082Tunisia College of Agriculture at Mograne University of Carthage1121MograneTunisia

Agricultural soils in semi-arid regions have frequently been degraded due to adverse climatic conditions,organic matter depletion,and poor farming *** enhance soil quality,this study examines the reuse of sewage sludge(SS)as an available source of organic matter in a typical Mediterranean sandy-loam ***,we studied the cumulative effect of two annual applications of 40,80 and 120 tons of sludge per ha on soil quality in absence of *** dose-dependent improvement of organic matter content was the most significant event that reflected sludge application rates,and consequently influenced other soil ***,soil structural stability increased by 13.3%,28.8%and 59.4%for treatments SS-40,SS-80 and SS-120 respectively as compared to unamended *** stability improvement was also confirmed by the dose-dependent variation of other edaphic factors including calcium content,the microbial quotient as well as Welt and C:N *** param-eters are involved in cementing soil aggregates by cation bridging,the formation of microbial mucilage,and clay-humic *** magnetic susceptibility(SMS)was measured in situ as a possible rapid tool to evaluate soil *** showed significant correlation with sludge dose and stability amelioration testifying to the aggregation role that can play Al2O3 and particularly Fe2O3 minerals added by the hematite-rich ***,analytical results and field observations revealed no trends of soil salinization or acidification by excessive sludge *** avoiding the rhizosphere effect,outcomes could reflect the resilience and intrinsic capacity of the soil to cope with excessive sludge loads.

关键词： Sandy loam soil Urban sewage sludge Structural stability Soil degradation Aggregation Magnetic susceptibility

Modeling interaction between CO_(2),brine and chalk reservoir rock including temperature effect on petrophysical properties

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Energy Geoscience 2021年第4期2卷 337-344页

作者： Hisham ben Mahmud Walid mohamed Mahmud ali Al-Rubaye Petroleum Engineering Department Curtin University MalaysiaCDT 250Miri98009Malaysia Department of Petroleum Engineering University of TripoliTripoliLibya Gudea Geoscience Group(GGSG) Thi QarIraq

Carbon dioxide(CO_(2))capture and sequestration through CO_(2)enhanced oil recovery(EOR)in oil reservoirs is one of the approaches considered to reduce CO_(2)emission into the *** injection of CO_(2)into a subsurface geological formation may lead to chemical reactions that may affect the formation pore structure and *** this study,the effect of CO_(2)ebrineerock interaction on the rock petrophysical properties and mineral volume fraction was numerically investigated during CO_(2)injection into a chalk reservoir rock.A 3D numerical modeling and simulation were conducted using COMSOL®Multiphysics commercial software of computational fluid dynamics(CFD)to simulate CO_(2)ebrine core flooding process in a chalk *** model was validated against a coreescale experimental data from *** differential pressure data matched the literature experimental data closely and consistently indicating good agreement between *** effect on the performance of CO_(2)ebrineechalk sequestration was also evaluated in the present *** indicated that porosity was only slightly affected by temperature increase during CO_(2)injection in contrast to permeability that was substantially affected by ***,chemical reactions enhanced as temperature increased leading to significant increase in ***,carbonated brine sequestration excelled at elevated temperature due to increased acidity which governs the sequestration *** developed model maybe considered as a reliable tool to optimize various operating parameters of CO_(2)ebrine sequestration.

关键词： CO_(2)ebrine injection Petrophysical properties Mineral volume fraction COMSOL Multiphysics software Temperature effect on chalk rock

CRP Binding Kinetics Enhancement Using Local Narrowing into a bent Channel: Finite Element Analysis

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Engineering（科研） 2022年第1期14卷 62-75页

作者： mohamed Bahri Imen Dermoul Marshet Getaye mohamed Amin Elaguech Khouloud Djebbi Mounir ben ali Chaker Tlili Deqiang Wang Chongqing School University of Chinese Academy of Sciences Chongqing China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing China University of Chinese Academy of Sciences Beijing China Preparatory Institute for Engineering of Nabeul IPEIN University of Carthage Campus Universitaire Merazka Tunisia NANOMISENE Lab LR16CRMN01 Centre for Research on Microelectronics and Nanotechnology of Sousse Technopole of Sousse Sousse Tunisia University of Sousse Higher Institute of Applied Sciences and Technology of Sousse GREENS-ISSAT Cité Ettafala Sousse Tunisia

Binding kinetics enhancement of a microfluidic biosensor into a micro-channel through the application of a supplementary mechanism has received tremendous attention because of the obtained significant enhancement factor. However, biosensor’s performance enhancement using only simple channel engineering is still rarely realized. Herein, we present a novel design of a complex reactive protein (CRP) biosensor into a U-shaped channel with a sensitive membrane located in the middle of the bent zone. Various critical factors affecting the equilibrium binding time are numerically investigated. The turn geometry is then optimized when the arc length along the inner and outer radii is almost the same, which leads to locally minimizing the channel height overhead the reaction surface and improves the analyte transport towards the sensing area. The numerical studies reveal that applying a local narrowing above the reaction surface can notably enhance the trapping and the surface formation of complex antibody-antigen, thus upgrading the biosensor performance. This work puts a significant advance towards microfluidic channel engineering and the exploration of micro-flow injection experimental studies.

关键词： Finite Elements Method Binding Reaction CRP Biosensor Microfluidic System Microchannel Turn Numerical Simulation