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Neuromuscular fatigue and recovery profiles in individuals with intellectual disability

Journal of Sport and Health Science 2019年第3期8卷 242-248页

作者： Rihab Borji firas zghal Nidhal Zarrouk Vincent Martin Sonia Sahli Haithem Rebai Research Unit Education Motor Skills Sports and Health (EM2S UR15JS01) Higher Institute of Sport and Physical Education of SfaxUniversity of Sfax Laboratory of Metabolic Adaptations to Exercise in Physiological and Pathological Conditions Blaise Pascal University

Purpose: This study aimed to explore neuromuscular fatigue and recovery profiles im individuals with intellectual disability(ID) after exhausting submaximal ***: Ten men with ID were compared to 10 men without ID. The evaluation of neuromuscular function consisted in brief(3 s) isometric maximal voluntary contraction(IMVC) of the knee extension superimposed with electrical nerve stimulation before, immediately after, and during33 min after an exhausting submaximal isometric task at 15% of the IMVC. Force, voluntary activation level(VAL), potentiated twitch(Ptw), and electromyography(EMG) signals were measured during IMVC and then ***: Individuals with ID developed lower baseline IMVC, VAL, Ptw; and RMS/M_(max) ratio(root-mean-square value normalized to the maximal peak-to-peak amplitude of the M-wave) than controls(p < 0.05). Nevertheless, the time to task failure was significantly longer in ID vs. controls(p < 0.05). The 2 groups presented similar IMVC decline and recovery kinetics after the fatiguing exercise. However. individuals with ID presented higher VAL and RMS/M_(max) ratio declines but lower Ptw decline compared to those without ID. Moreover, individuals with ID demonstrated a persistent central fatigue but faster recovery from peripheral ***: These differences in neuromuscular fatigue profiles and recovery kinetics should be acknowledged when prescribing training programs for individuals with ID.

关键词： Central fatigue Intellectual disability Neuromuscular fatigue Peripheral fatigue Sustained sub-maximal exercise Twitch interpolation technique

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Large deflection response-based geometrical nonlinearity of nanocomposite structures reinforced with carbon nanotubes

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Applied Mathematics and Mechanics(English Edition) 2020年第8期41卷 1227-1250页

作者： S.zghal A.FRIKHA F.DAMMAK Laboratory of Electromechanical Systems National Engineering School of SfaxUniversity of SfaxB.P W3038SfaxTunisia

This paper deals with the nonlinear large deflection analysis of functionally graded carbon nanotube-reinforced composite(FG-CNTRC)plates and panels using a finite element *** on the first-order shear deformation theory(FSDT),the proposed model takes into account the transverse shear deformations and incorporates the geometrical nonlinearity type.A C^0 isoparametric finite shell element is developed for the present nonlinear model with the description of large displacements and finite *** adopting the extended rule of mixture,the effective material properties of FG-CNTRCs are approximated with the introduction of some efficiency *** carbon nanotube(CNT)distributions,labeled uniformly distributed(UD)-CNT,FG-VCNT,FG-O-CNT,and FG-X-CNT,are *** solution procedure is carried out via the Newton-Raphson incremental *** numerical applications in both isotropic and CNTRC composite cases are performed to trace the potential of the present *** effects of the CNT distributions,their volume fractions,and the geometrical characteristics on the nonlinear deflection responses of FG-CNTRC structures are highlighted via a detailed parametric study.

关键词： carbon nanotube(CNT) functionally graded material(FGM) geometrical nonlinearity large deflection

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Correlation between welding and hardening parameters of friction stir welded joints of 2017 aluminum alloy

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Transactions of Nonferrous Metals Society of China 2012年第5期22卷 1064-1072页

作者： Hassen BOUZAIENE Mohamed-Ali REZGUI Mahfoudh AYADI Ali zghal Research Unit in Solid Mechanics Structures and Technological Development(99-UR11-46)Higher School of Sciences and Techniques of TunisTunisia

An experimental study was undertaken to express the hardening Swift law according to friction stir welding （FSW） aluminum alloy 2017. Tensile tests of welded joints were run in accordance with face centered composite design. Two types of identified models based on least square method and response surface method were used to assess the contribution of FSW independent factors on the hardening parameters. These models were introduced into finite-element code ＂Abaqus＂ to simulate tensile tests of welded joints. The relative average deviation criterion, between the experimental data and the numerical simulations of tension-elongation of tensile tests, shows good agreement between the experimental results and the predicted hardening models. These results can be used to perform multi-criteria optimization for carrying out specific welds or conducting numerical simulation of plastic deformation of forming process of FSW parts such as hydroforming, bending and forging.

关键词： friction stir welding response surface methodology face centered central composite design hardening simulation relative average deviation criterion

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DOF:a generic approach of domain ontology fuzzification

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Frontiers of Computer Science 2021年第3期15卷 97-108页

作者： Houda AKREMI Sami zghal Faculty of Sciences of Tunis University of Tunis El ManarTunis 2092Tunisia Faculte des Sciences Juridiques Universite de JendoubaJendouba 8189Tunisia

Although recent studies on the Semantic Web have focused on crisp ontologies and knowledge representation,they have paid less attention to imprecise ***,the results of these studies constitute a Semantic Web that can answer requests almost perfectly with respect to ***,they ensure low *** such,we propose in this re-search work a new generic approach of fuzzification that which allows a semantic representation of crisp and fuzzy data in a domain *** the framework of our real case study,the obtained illustrate that our approach is highly better than the crisp one in terms of completeness,comprehensiveness,generality,comprehension and shareability.

关键词： crisp ontology fuzzy ontology fuzzy logic fuzzy reasoning domain ontology

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Rapid reversibility of Takotsubo cardiomyopathy

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World Journal of Cardiovascular Diseases 2012年第1期2卷 26-28页

作者： Fathia Mghaieth zghal Ramy Trabelsi Sihem Mbarki Mohamed Sami Mourali Rachid Mechmeche 不详

Background: In Takotsubo cardiomyopathy (TCM), left ventricular dysfunction is usually reversible within a few weeks. Complete recovery can however be very rapid. We report the case of Mrs. TA, a 53 year old patient who had a history of hypertension treated with atenolol and captopril. She was admitted with the diagnosis of non ST segment elevation myo-cardial infarction. The electrocardiogram showed anterior sub and the troponinI level was 3.48 mg/l. Echo-cardiography revealed a left ventricular (LV) ballooning and LV ejection fraction was 36%. A recent emotional stress was mentioned. TCM was suspected and emergency angiography showed apical ballooning with a normal coronary angiogram. There was a complete recovery in 72 hours with a normalization of regional and global LV function at echocardiography and angiography. Conclusion: There is a large variability in TCM evolution aspects probably due to a variable physiopathological mechanism which remains to be clarified.

关键词： Apical Ballooning Takotsubo Cardiomyopathy Early Recovery

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Influence of Cutting and Geometrical Parameters on the Cutting Force in Milling

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Engineering（科研） 2010年第10期2卷 751-761页

作者： Hedi Yangui Bacem zghal Amir Kessentini Gael Chevallier Alain Riviere Mohamed Haddar Chafik Karra Unite de Mecanique Modélisation et Production(U2MP)Ecole Nationale d’Ingénieurs de Sfax(E.N.I.S.)route soukra km 4 Sfax–TUNISIEFrance Laboratoire d’Ingénierie des Structures Mécanique et de Matériaux(LISMMA) Institut Supérieur de Mécanique de Paris(SUPMECA)3 rue Fernand Hainaut93407 cedex Saint ouenParis–France

This paper presents a numerical modelling of the dynamic behaviour of the Machine-Tool-Part system (MOP) in milling. The numerical study of such complex structure requires the use of sophisticated method like finite elements one. Simulation is employed to predict cutting forces and dynamic response of Machine-Tool-Part system (MOP) during end-milling operation. Finally, spectral analysis is presented to see the influence of feed direction in the vibration.

关键词： Milling Modelling Cutting Force Finite Element

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Tako-tsubo cardiomyopathy in a male patient after administration of isoproterenol and implantation of a pacemaker

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World Journal of Cardiovascular Diseases 2012年第1期2卷 38-41页

作者： Fathia Mghaieth zghal Ramy Trabelsi Sihem Mbarki Ghassen Cherif Nidhal Ben Moussa Mohamed Sami Mourali Rachid Mechmeche 不详

Background: Tako-tsubo cardiomyopathy occurs typicallly after an intrinsic adrenergic hyperstimulation triggered by a psychological or physically stressful event. Exceptionally, it may be caused by an exogenous hyperadrenergism. We report the case of an 85 year old man, hypertensive, with a history of ischemic stroke. He consulted for signs of heart failure with recurrent dizziness two weeks which was explained by an atrioventricular block. Initial echocardiography showed left ventricular ejection fraction to 60% with no wall motion abnormalities. The patient received iso-prenaline (0.02 mcg/kg/mn) for 20 hours before the implantation of a single chamber pacemaker. At 24 hours of admission an acute pulmonary edema occurred. The control echocardiography showed impaired left ventricular ejection fraction of 25% with apical ballooning and akinesis was also found on ventricu-lography. Coronary angiography showed no significant coronary lesions. Troponin level was elevated to 2 ng/ml. The pulmonary edema was then controlled. Subsequent clinical and echocardiographic were favo- rable after two weeks which was consistent with the diagnosis of tako-tsubo cardiomyopathy. Conclusion: This case illustrates an example of tako-tsubo syndrome induced by an exogenous catecholergic stimulation (isoprenaline) combined with an endogenous release after a pacemaker implantation which confirmed the physiopathological hypothesis of a catecholamine-mediated stunning in tako-tsubo cardiomyopathy.

关键词： Tako-Tsubo Syndrome Isoprenaline Pacemaker Left Ventricular Dysfunction Ventricular Dysfunction

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Rapid reversibility of Takotsubo cardiomyopathy

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World Journal of Cardiovascular Diseases（心血管病） 2012年第1期

作者： Fathia Mghaieth zghal Ramy Trabelsi Sihem Mbarki Mohamed Sami Mourali Rachid Mechmeche

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Tako-tsubo cardiomyopathy in a male patient after administration of isoproterenol and implantation of a pacemaker

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World Journal of Cardiovascular Diseases（心血管病） 2012年第1期

作者： Fathia Mghaieth zghal Ramy Trabelsi Sihem Mbarki Ghassen Cherif Nidhal Ben Moussa Mohamed Sami Mourali Rachid Mechmeche

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