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Hospital Night Shift and Its Effects on the Quality of Sleep, the Quality of Life, and Vigilance Troubles among Nurses

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International Journal of Clinical Medicine 2014年第10期5卷 572-583页

作者： Wided Boughattas Olfa El Maalel ridha ben chikh Maher Maoua Kalboussi Houda Aicha Braham Houssem Rhif Souheil Chatti Faten Debbabi Mohamed Dogui Nejib Mrizak Neurophysiology Department Sahloul Teaching Hospital Sousse Tunisia Occupational Medicine and Professional Pathologies Department Medicine Faculty of Sousse Sousse Tunisia

Introduction: The exposure to shift works, and especially to night shift, goes against the circadian rythmicity of the social man, which brings about a multitude of disruptive effects on health. In a hospital environment, such night shift is necessary so as to ensure the continuity of care. Sleep and vigilance disorders related to this work mode are frequent and often pose adaptation problems. The objective of this study is to detect the harmful effects of night shift on sleep, vigilance and the quality of life of nurses in Farhat Hached Teaching Hospital in Sousse. Material and Methods: It is a cross-sectional study carried out among two groups of nurses: one group performing a fixed night work and the other one working permanently during the day at Farhat Hached Teaching Hospital in Sousse. Data collection is mainly based on validated questionnaires evaluating sleep quality (Pittsburg sleep quality index), daytime sleepiness (Epworth sleepiness scale), sleep typology (Horne and Ostberg questionnaire), and the quality of life (SF-12). An objective evaluation of vigilance was realized by the study of reaction time and error rates to different tasks of “Super lab” software. Results: 50 night and 50 day nurses have been colligated. Both groups were age- and gender-matched. Sleep quality mean index was significantly higher among night nurses in comparison with day nurses (10.2 ± 5.9 versus 6.76 ± 5.16). After multivariate analysis, sleep quality was significantly correlated to age, department, schedule and the choice of schedule. Night shift was not related to daytime sleepiness. The objective analysis of vigilance showed that the reaction time to different tasks exploring the attentional mechanisms, as well as errors rate, were significantly more important among the night group. The mental score of the quality of life was significantly higher among day nurses. However, such difference was not significant with regard to physical score. Conclusion: The findings of our s

关键词： Night Shift Nurse Quality of Life Sleep Vigilance

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Optimal Systematic Determination of Models' Base for Multimodel Representation: Real Time Application

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International Journal of Automation and computing 2014年第6期11卷 644-652页

作者： Majda Ltaief Anis Messaoud ridha ben Abdennour Research Unit of Numerical Control of Industrial Processes National School of Engineers of Gabes University of Gabes St Omar Ibn El-Khattab6029 Gabes Tunisia

The multimodel approach is a powerful and practical tool to deal with analysis, modeling, observation, emulation and control of complex systems. In the modeling framework, we propose in this paper a new method for optimal systematic determination of models base for multimodel representation. This method is based on the classification of data set picked out of the considered system. The obtained cluster centers are exploited to provide the weighting functions and to deduce the corresponding dispersions and their models base. A simulation example and an experimental validation on a semi-batch reactor are presented to evaluate the effectiveness of the proposed method.

关键词： Multimodel approach identification classification weighting functions complex systems chemical reactor

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ACTIVE VIBRATION SUPPRESSION VIA LINEARIZING HYSTERESIS OF PIEZOCERAMIC ACTUATORS

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Chinese Journal of Mechanical Engineering 2007年第4期20卷 84-87页

作者： HU Hong SHI Hongyan ben MRAD ridha Department of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen Graduate School Shenzhen 518055. China Department of Mechanical and Industrial Engineering University of Toronto Toronto MSS 3G8. Canada

A novel active vibration control technique on the basis of linearized piezoelectric actuators is presented. An experimental apparatus consisting of a cantilever beam to which are attached strain patches and piezoceramic actuators to be used for active vibration suppression is described. A dynamical model of the cantilever beam using Lagrange＇s equation and two coordinate systems are presented. Based on the Lyapunov＇s direct method, an active vibration controller with hysteresis compensation is designed. The controller is designed so that it guarantees the global stability of the overall system. The controller developed is assessed experimentally.

关键词： Active vibration control Piezoceramic actuator Hysteresis

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Electrochemical behavior and analytical detection of Imidacloprid insecticide on a BDD electrode using square-wave voltammetric method

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Chinese Chemical Letters 2016年第5期27卷 666-672页

作者： Mabrouk ben Brahim Hafedh Belhadj Ammar ridha Abdelhedi Youssef Samet Electrochemistry and Environmental Laboratory Department of Materials Engineering National Engineering School of Sfax University of Sfax B.P. I 1733038 Sfax Tunisia

A sensitive square-wave voltammetric method for the determination of lmidacloprid （IMD） was developed using electrochemically pretreated boron-doped diamond （BDD） electrode. Aqueous solutions were prepared with Confidor 200 SL as the commercial formulation of IMD. Sodium sulfate （Na2SO4） was used as supporting electrolyte. The influence of operating parameters, such as the pH of the medium, frequency, pulse amplitude, scan increment and the concentration of IMD was investigated. An irreversible cathodic peak, corresponding to the reduction oflMD is observed at 1.21 V （vs. SCE） and the electrode reaction was controlled by adsorption. Under optimized conditions, the square-wave reduction peak current was linear over the concentration range of （30-200 μmol L 1） with a detection and quantification limits of 8.60 μmol L 1 and 28.67 μmol L 1, respectively. The results were compared with spectrophotometry and HPLC methods under some conditions and found to be in good agreement. To investigate applicability to real samples, the proposed method was applied to the determination of IMD in plum juice.

关键词： Imidacloprid Square-wave volammetry Boron-doped diamond electrode Electrochemical detection

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A Systematic Design of Emulators for Multivariable Non Square and Nonlinear Systems

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International Journal of Automation and computing 2017年第6期14卷 742-754页

作者： Nesrine Bahri Asma Atig ridha ben Abdennour Fabrice Druaux Dimitri Lefebvre University of Gabes National School of Engineers of Gabes-TunisiaStreet Omar Ibn Khattab 6029Gabes University of Havre 25 Rue Philippe Lebon76600 Le HavreFrance

In this paper, multimodel and neural emulators are proposed for uncoupled multivariable nonlinear plants with unknown dynamics. The contributions of this paper are to extend the emulators to multivariable non square systems and to propose a systematic method to compute the multimodel synthesis parameters. The effectiveness of the proposed emulators is shown through two simulation examples. The obtained results are very satisfactory, they illustrate the performance of both emulators and show the advantages of the multimodel emulator relatively to the neural one.

关键词： Uncoupled multimodel neural networks emulation multivariable nonlinear systems parameters estimation

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Ultrasonic Activation of Suzuki and Hiyama Cross-Coupling Reactions Catalyzed by Palladium

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Advances in Chemical Engineering and Science 2016年第2期6卷 111-123页

作者： Khemais Said ridha ben Salem Physical Organic Chemistry Laboratory (UR11ES74) Science Faculty of Sfax University of Sfax Sfax Tunisia

The coupling reaction of aryl bromide and aryl boronic acid in water/DMF as solvent was studied using a palladium-complex as a catalyst in the presence of ultrasound at room temperature. The effect on the reaction of a base and a solvent was also studied with and without ultrasound and was found to increase the speed of the reaction. In this regard, we propose reaction mechanisms that could explain the results obtained.

关键词： Palladium Suzuki Cross-Coupling Hiyama Ultrasound Sonochemical Activation

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Intelligent System of M-Vision Based on Optimized SIFT

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Journal of Computer and Communications 2016年第4期4卷 52-62页

作者： Sameh ben Hamida ridha Azizi Alia Maaloul Institute of Higher Technological Studies of Gabes Gabes Tunisia Institute of Higher Technological Studies of Sousse Sousse Tunisia

This paper proposes the recognition of bank notes through a mobile intelligent vision system under Android and this, based on an approach of artificial vision of images using the SIFT algorithm under OPENCV whose principle is to detect the remarkable points of this image and compare it with the image saved in the local database on a handheld device. Finally, the system informs the user of the result by a sound indicating the value of the currency detected. The SIFT algorithm proposed can achieve a higher percentage of identification in a reduced time compared to results achieved by classic SIFT.

关键词： Android Image Recognition Open CV SIFT

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A New Method for Cardiac Diseases Diagnosis

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Advances in Bioscience and Biotechnology 2015年第4期6卷 311-319页

作者： ridha ben Salah Tareq Alhadidi Sofienne Mansouri Mounir Naouar College of Applied Medical Sciences Department of Medical Equipment Technology Prince Sattam Bin Abdulaziz University Al-Kharj KSA Higher Institute of Medical Technologies of Tunis Laboratory of Biophysics University of Tunis El Manar Tunis Tunisia

The objective of this work is to perform automatic diagnosis using a non invasive method which consists on the bioimpedance signal processing. Bioimpedance signal (BIS) represents the aorta impedance variation during the heart cycle activity. BIS is detected by mean of two electrodes located at the level of the ascendant aorta. Automatic diagnosis method consists on preparing, first, a data base with a set of cepstral parameters of different BIS according to normal case and different cardiac diseases. This data base is composed from n classes Yk corresponding to n diseases. The classification of anonymous individuals is based on the determination of Fisher distance between anonymous disease and class Yk using Fischer formula. Our method permits to calculate seven relevant cepstral parameters. The application of Fisher method has allowed us to perform the diagnosis of five anonymous cases. The major interest of this method is its especially useful for the exploration of cardiovascular system anomalies for emergency cases, children, elderly and pregnant women who can’t support surgical operations especially at the level of the heart.

关键词： Signal Processing Cepstral Parameters Bioimpedance Cardiac Diseases Automatic Diagnosis

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Phase Transfer Catalysis of Henry and Darzens Reactions

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International Journal of Organic Chemistry 2011年第3期1卷 119-124页

作者： Layla Mhamdi Hafedh Bohli Younes Moussaoui ridha ben Salem 不详

We describe in this work the influence of the addition of phase transfer catalyst in heterogeneous medium liquid/liquid on the output of the reactions of Darzens and Henry. It proves that the reaction of Darzens is favoured in the presence of low base such as K2CO3 and Et3N. Phase transfer catalysis is an efficient activation method in Darzens and Henry reactions. Thus, the Ethylene Diammonium Diacetate (EDD) has a comparable catalytic activity has that of quaternary ammonium salts in the reaction of Darzens.

关键词： Darzens Henry Phase Transfer Catalysis Mechanism

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Phase Transfer Catalysis Improved Synthesis of 3,4-Dihydropyrimidinones

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International Journal of Organic Chemistry 2013年第3期3卷 96-100页

作者： Hela Slimi Khemais Said Younes Moussaoui ridha ben Salem Physical Organic Chemistry Laboratory(UR11ES74) Science Faculty of SfaxSfax UniversitySfaxTunisia Science Faculty of Gafsa Gafsa UniversityGafsaTunisia

Various 3,4-dihydropyrimidinones can be prepared via Biginelli reaction in aqueous media by using quaternary ammonium salts of different alkyl groups (C4 and C8) and anions (Cl-?and Br-) as catalysts. The use of quaternary ammonium salts along with longer alkyl chains increases the yield of the Biginelli reaction;however, bromide ammonium salts are less active than the chloride ones.

关键词： Multicomponent Reaction Biginelli Reaction 3,4-Dihydropyrimidinones Phase-Transfer Catalysis Quaternary Ammonium Salts

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