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Geochemistry, mineral paragenesis and geothermal conditions of oreforming fluids from the Ain El Bey Cu–Fe deposit: potential occurrence of native gold and precious metal traces (North African orogenic belt, Northern Tunisia)

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Acta Geochimica 2024年第2期43卷 366-384页

作者： Rania ben Aissa Wiem ben Aissa Said Tlig Lassaad ben Aissa abdessalem ben Haj Amara Faculty of Science of Bizerte University of Carthage7021 ZarzounaBizerteTunisia Laboratoire de Recherche Ressources Materiaux et EcosystemesUniversity of Carthage7021 ZarzounaBizerteTunisia Department of Geology University Claude Bernard Lyon 169622 VilleurbanneFrance Faculty of Science of Tunis University of Tunis-El ManarRommana1068 TunisTunisia

The Ain El Bey abandoned mine, in North-West Tunisia, fits into the geodynamic context of the European and African plate boundary. Ore deposit corresponds to veins and breccia of multiphase Cu–Fe-rich mineralization related to various hydrothermal fluid circulations. Petromineralogical studies indicate a rich mineral paragenesis with a minimum of seven mineralization phases and, at least, six pyrite generations. As is also the case for galena and native silver, native gold is observed for the first time as inclusion in quartz which opens up, thus, new perspectives for prospecting and evaluating the potential for noble metals associated with the mineralization. Scanning Electron Microscope--Energy Dispersive Spectroscopy and Transmission electron microscopy analyses show, in addition, a large incorporation of trace elements, including Ag and Au, in mineral structures such as fahlores(tetrahedrite-tennantite) and chalcopyrite ones. The mineral/mineral associations, used as geothermometers, gave estimated temperatures for the mineralizing fluids varying from 254 to 330 ℃ for phase Ⅲ, from 254 to 350 ℃ for phase Ⅳ, and from 200 to 300 ℃ for phases Ⅴ and Ⅵ. The seventh and last identified mineralization phase, marked by a deposit of native gold, reflects a drop in the mineralizing fluid’s temperature(< 200 ℃) compatible with boiling conditions. Such results open up perspectives for the development of precious metal research and the revaluation of the Cu–Fe ore deposit at the Ain El Bey abandoned mine, as well as at the surrounding areas fitting in the geodynamic framework of the Africa-Europe plate boundary.

关键词： Ore-formingﬂuids Mineral geochemistry Mineral geothermometers Native silver-gold Ain El Bey Ore deposit North Tunisia

The Relation between Mental Workload and Face Temperature in Flight Simulation

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Journal of Behavioral and Brain Science 2024年第2期14卷 64-92页

作者： Amin Bonyad Hamdi ben abdessalem Claude Frasson Dé partement d’Informatique et de Recherche Op&eacuterationnelle Universit&eacute de Montr&eacuteal Montr&eacuteal Canada Dé partement d’Informatique et de Math&eacutematique Universit&eacute du Qu&eacutebec &agrave Chicoutimi Chicoutimi Canada

In this research, we study the relationship between mental workload and facial temperature of aircraft participants during a simulated takeoff flight. We conducted experiments to comprehend the correlation between work and facial temperature within the flight simulator. The experiment involved a group of 10 participants who played the role of pilots in a simulated A-320 flight. Six different flying scenarios were designed to simulate normal and emergency situations on airplane takeoff that would occur in different levels of mental workload for the participants. The measurements were workload assessment, face temperatures, and heart rate monitoring. Throughout the experiments, we collected a total of 120 instances of takeoffs, together with over 10 hours of time-series data including heart rate, workload, and face thermal images and temperatures. Comparative analysis of EEG data and thermal image types, revealed intriguing findings. The results indicate a notable inverse relationship between workload and facial muscle temperatures, as well as facial landmark points. The results of this study contribute to a deeper understanding of the physiological effects of workload, as well as practical implications for aviation safety and performance.

关键词： Mental Workload EEG Thermal Images Flight Simulation Aviation Face Temperature

Inter-comparative Study of Quantitative Methods of Industrial Clinker

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Journal of Wuhan University of Technology(Materials Science) 2017年第6期32卷 1250-1260页

作者： benmohamed Mohamed Galai Haykel Alouani Rabah Bejaoui Marouene ben Haj Amara abdessalem ben Rhaim Hafsia UR05/13-01 Physique des Materiaux Lamellaires et Nanomateriaux Hybrides (PMLNMH) Faeulte des Sciences de Bizerte Universitede Carthage Zarzouna 7021 Tunisia Institut National de Recherche et d'Analyse Physico-chimiques 2026 Technopole de Sidi Thabet Tunisia

Impurities from the raw materials, the grinding and the homogenization of the raw materials, the kiln instability and the complexity of the cooling step, all these factors make it difficult to obtain a perfect evaluation of the mineralogical composition of Portland clinker. We studied the limitations of the most commonly used quantitative methods and recommend some procedures to obtain reliable and reproducible results of quantitative analyses. Different clinker samples（provided by the Bizerte Cement Company（Tunisia）） were subjected to an elemental analysis by X-ray fluorescence and the mineralogical composition was determined by the Bogue calculation and by X-ray powder diffraction combined with the Rietveld method（Different softwares were used： XPert High Score Plus version 2.0 and TOPAS version 4.2）. We then compared the results obtained by the Rietveld method and the Bogue calculation to the specific peak areas of each phase. The content of each phase, determined by the Rietveld method, varied proportionally to the change in peak area; a significant difference in these results was found by using the elementary Bogue calculation.

关键词： portland clinker bogue calculation rietveld method quantitative mineralogy specificpeaks different software

Optimizing Alzheimer’s Disease Therapy Using a Neural Intelligent Agent-Based Platform

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International Journal of Intelligence Science 2021年第2期11卷 70-96页

作者： Hamdi ben abdessalem Alexie Byrns Claude Frasson Département d’Informatique et de Recherche Opérationnelle Université de Montréal Montréal Canada

Alzheimer’s disease affects millions of persons every year. Negative emotions such as stress and frustration have a negative impact on memory function and Alzheimer's patients experience more negative emotions than healthy adults. Non-pharmacological treatment such as immersion in virtual environments could help Alzheimer patients by reducing their negative emotions, but it has restrictions and requirements. In this work, we present three virtual reality relaxing systems in which the patients are immersed in relaxing environments. We propose to use intelligent agents in order to adapt the relaxing environment to each participant and optimize its relaxation effect. The intelligent agents track the emotions of patients using electroencephalography as input in order to adapt the environments. We designed each system with different levels of intelligence in order to analyze the impact of the adaptation on the patients. Experiments were performed for each system on participants with subjective cognitive decline. Results show that these relaxing systems can reduce negative emotions and improve participants’ memory performance. The positive effects on affective state and memory persisted for a longer period of time and were generally more effective for the systems with more intelligence. We believe that the combination of a relaxing environment, virtual reality, intelligent agents for adapting

关键词： EEG Brain Assessment Intelligent Agent Virtual Reality Alzheimer’s Disease Subjective Cognitive Decline Emotions Adaptation Emotional Intelligence

Cognitive Workload Assessment of Aircraft Pilots

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Journal of Behavioral and Brain Science 2022年第10期12卷 474-484页

作者： Maxime Antoine Hamdi ben abdessalem Claude Frasson Departement d’Informatique et de Recherche Operationnelle Universite de Montreal Montreal Canada

In this research, we study the cognitive workload of aircraft pilots during a simulated takeoff procedure. We propose a proof-of-concept setup environment to gather heart rate, pupil dilation, and brain cognitive workload data during an A320 takeoff within a simulator. Experiments were performed during which we collected 136 takeoffs across 13 pilots for more than 9 hours of time-series data. Moreover, this paper investigates the correlations between heart rate, pupil dilation, and cognitive workload during such exercise and found that a spike in cognitive load during a critical moment, such as an engine failure, augments a pilot’s heart rate and pupil dilation. Results show that a critical moment within a takeoff procedure increases a pilot’s cognitive load. Next, we used a stacked-LSTM model to predict cognitive workload 5 seconds into the future. The model was able to produce accurate predictions.

关键词： Cognitive Workload Aviation Heart Rate Pupil Dilation Machine Learning Deep Learning EEG

Detection and Recuperation of Mental Fatigue

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Journal of Behavioral and Brain Science 2023年第2期13卷 15-31页

作者： Alyssa Hajj Assaf Hamdi ben abdessalem Claude Frasson Département d’Informatique et de Recherche Opérationnelle Université de Montréal Montréal Canada

Mental fatigue is a complex state that results from prolonged cognitive activity. Symptoms of mental fatigue can include change in mood, motivation, and temporary deterioration of various cognitive functions involved in goal-directed behavior. Extensive research has been done to develop methods for recognizing physiological and psychophysiological signs of mental fatigue. This has allowed the development of many AI-based models to classify different levels of fatigue, using data extracted from eye-tracking device, EEG, or ECG. In this paper, we present an experimental protocol which aims to both generate/measure mental fatigue and provide effective strategies for recuperation via VR sessions paired with EEG and eye tracking devices. This paper first provides a comprehensive state-of-the-art of mental fatigue predictive factors, measurement methods, and recuperation strategies. Then the paper presents an experimental protocol resulting from the state-of-the-art to 1) generate and measure mental fatigue and 2) evaluate the effectiveness of virtual therapy for fatigue recuperation, using a virtual reality (VR) simulated environment. In our work, we successfully generated mental fatigue through completion of cognitive tasks in a virtual simulated environment. Participants showed significant decline in pupil diameter and theta/alpha score during the various cognitive tasks. We trained an RBF SVM classifier from Electroencephalogram (EEG) data classifying mental fatigue with 95% accuracy on the test set. Finally, our results show that the time allocated for virtual therapy did not improve pupil diameter in post-relaxation period. Further research on the impact of relaxation therapy on relaxation therapy should allocate time closer to the standard recovery time of 60 min.

关键词： Mental Fatigue Recovery Machine Learning Mental Workload Task-Engagement Virtual Reality EEG Pupil Diameter

Spontaneous and simultaneous complete bilateral rupture of the quadriceps tendon in a patient receiving hemodialysis: A case report and literature review

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World Journal of Orthopedics 2018年第9期9卷 180-184页

作者： Wassim Zribi Mohamed Zribi Ahmed Racem Guidara Mohamed ben Jemaa Ameur Abid Nabil Krid abdessalem Naceur Hassib Keskes Department of Orthopaedic Surgery and Traumatology Habib Bourguiba University Hospital Department of Orthopaedic Surgery and Traumatology Marechal Leclerc Argentan Hospital

The spontaneous and simultaneous rupture of both quadriceps tendons is uncommon and has rarely been reported in the literature. The current case involves a 43-year-old man with end-stage renal disease requiring hemodialysis for the past 20 years. The patient experienced bilateral knee pain and swelling and was unable to bear weight. Physical examination revealed bilateral quadriceps tendon defect above the patella and loss of active extension. Although plain radiographs of both knees showed no fracture or widening of the joint space, an inferiorly positioned patella was observed. Ultrasonography of the knees revealed a quadriceps tendon defect at the upper edge of each patella, while MR imaging revealed a tear in each quadriceps tendon from the superior poles of the patella. The patient then underwent surgical correction wherein the tendons were repaired using sutures passed through drill holes in the patella. The knees were immobilized with splints for 4 wk before starting physiotherapy. The patient subsequently regained full functional activity within 1 year.

关键词： Quadriceps tendon Tear Krackow sutures Renal failure Hyperparathyroidism

Identifying Brain Characteristics of Bright Students

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Journal of Intelligent Learning Systems and Applications 2018年第3期10卷 93-103页

作者： Ramla Ghali Hamdi ben abdessalem Claude Frasson Roger Nkambou Department of Computer Science Université du Québec à Montréal Montréal Canada Department of Computer Science and Operations Research Université de Montréal Montréal Canada

Gifted students have different ways of learning. They are characterized by a fitful level of attention and intuitive reasoning. In order to distinguish gifted students from normal students, we conducted an experiment with 17 pupils, willing participants in this study. We collected different types of data (gender, age, performance, initial average in math and EEG mental states) in a web platform called NetMath intending for the learning of mathematics. We selected ten tasks divided into three difficulty levels (easy, medium and hard). Participants were invited to respond to top-level exercises on the four basic operations in decimals. Our first results confirmed that the student’s performance has no relation with age. A younger 9-year-old student achieved a higher score than the group with an average of 68.18%. This student can be considered as a gifted one. The gifted students can be also characterized by a mean value of attention (around 60%). They also can be defined by slightly weaker values of their mental states of attention and workload in comparison with the weak pupils.

关键词： NetMath Platform Performance Workload Attention Relaxation Decimal Numbers

Evaluation of hypoglycemic and hypolipidemic activities of aqueous extract of Cistus ladaniferus in streptozotocin-induced diabetic rats

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Asian Pacific Journal of Tropical Biomedicine 2016年第12期6卷 1044-1049页

作者： Mohamed El Kabbaoui Alae Chda Ouarda Azdad Najlae Mejrhit Lotfi Aarab Rachid bencheikh abdelali Tazi Laboratory of Bioactive Molecules Faculty of Sciences and TechniquesSidi Mohamed Ben Abdellah University(USMBA)

Objective:To evaluate the effect of aqueous leaf extract of Cistus ladaniferus(***) on glycemic and lipidemic status in diabetic ***:Overnight fasted rats were injected intraperitoneally with streptozotocin(45 mg/kg) to induce experimental *** aqueous extract of the leaves of *** was administered orally at the dose of 500 mg/kg body weight to diabetic rats for a period of 28 *** effect,body weight,oral glucose tolerance,change in lipid parameters,urea,creatinine,aspartate aminotransferase and alanine aminotransferase levels of diabetic rats treated with aqueous extract were evaluated in experimental ***:Administration of 500 mg/kg of *** extract to diabetic rats for 28 days resulted in a significant reduction in the levels of blood glucose,alanine aminotransferase,aspartate aminotransferase,urea and ***,the extract of *** improved glucose tolerance in diabetic rats,and its antidiabetic effect was similar to the one obtained with *** hypolipidemic effect was demonstrated by an important decrease in plasma total cholesterol,triglycerides and low density lipoprotein-cholesterol ***:It is concluded that *** leaf extract showed an antidiabetic activity in experimental diabetes which was similar to the one obtained with glibenclamide.

关键词： Cistus ladaniferus Diabetes mellitus Streptozotocin Antidiabetic activity Hypolipidemic activity Glucose tolerance