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Enhancing optical absorption in visible light of ZnO co-doped with europium and promethium by first-principles study through modified Becke and Johnson potential scheme

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Journal of Rare Earths 2019年第4期37卷 416-421页

作者： a.g.el hachimi M.L.Ould NE A.el Yousfi A.Benyoussef A.el Kenz Laboratory of Condensed Matter and Interdisciplinary Sciences (LaMCScI) Associé Au CNRST (URAC 12) Département de Physique B.P.1014 Faculté des SciencesUniversité Mohammed V Hassan Ⅱ Academy of Science and Technology

By using first-principles calculations we studied the electronic, optical and magnetic properties of ZnO co-doped with Eu and Pm. In this calculation, we used Wien2 k code based on full potential linearized augmented plane waves(FP-LAPW) method with the modified Becke-Johnson(mBJ) approximation. This correction gives good band gap compared to experimental band gap. The introduction of Eu and Pm codoping leads to an increase in the band gap. electrons can transit easily from the valence band to the conduction band, which results in an enhancement of visible light absorption in a wider absorption range. Absorption spectra reach a high value in visible and infrared light regions. With the significance of the obtained results, the studied compounds may potentially find spintronic and optoelectronic applications.

关键词： Zinc oxide Rare earth Density functional theory Modified Becke-Johnson Magnetic properties Spintronics

Duty Cycle of a Radiant Ceiling Heating System under Extremely Cold-Temperature Conditions:A Theoretical Assessment

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Journal of Energy and Power Engineering 2019年第10期13卷 359-368页

作者： Mohamed Lateb hachimi Fellouah Department of Mechanical Engineering Universitéde Sherbrooke2500 Blvd.de l’UniversitéSherbrookeQC J1K 2R1Canada

This work focuses on the estimation of a duty cycle of a radiant ceiling heating system with a panel surface temperature of 35℃and a heat flux of 65 W/m2 that corresponds to a thermal comfort for sedentary *** results obtained are based on the theoretical heat transfer equations that govern the radiant and natural convection heat exchange mechanisms,and experimental heat transfer coefficients available in the *** results of the examined radiant heating system with specific conditions showed that a duty cycle of 6.46 min alternated by 13.36 min in shutting-down position is required to assure an acceptable thermal comfort for the enclosure space *** addition,the study showed that for extremely cold-temperature conditions the heating system requires a daily operating load of about 61.2%which clearly proves the efficiency of these radiant heating systems in terms of energy consumption.

关键词： Radiant ceiling panels natural convection transfer thermal comfort radiant heating systems duty cycle energy consumption.

What Factors Influence the Choice of Anesthesiology in a Moroccan Medical School?

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International Journal of Clinical Medicine 2022年第1期13卷 57-65页

作者： Abdelhamid hachimi Soulaymane Rachda Mohamed el-Alaoui Leonard Biantona Bouebazebi Rajaa Belmaati Meriem Essafti Fatima-Ezzahra Saroukh Mohamed Amine Medical Intensive Care Unit Faculty of Medicine and Pharmacy Cadi Ayyad University Marrakech Morocco Community Medicine and Public Health Department Research Laboratory Biosciences and Health Faculty of Medicine and Pharmacy Cadi Ayyad University Marrakech Morocco

Objective: To determine factors influencing anesthesiology choice among resident doctors at the medical school of Marrakech. Materials and Methods: We have conducted a descriptive cross-sectional study based on an anonymous questionnaire. Results: A total of 406/672 questionnaires were returned, with a female/male sex ratio of 1.07. The duration of the training (OR: 3.3;CI 95%: 1.74 - 6.23;p ellectual challenge (OR: 3.02;CI 95%: 1.69 - 5.37;p elationship (OR: 2.22;CI 95%: 1.02 - 4.84;p: 0.04), and financial aspects (OR: 2.14;CI 95%: 1.09 - 4.21;p: 0.02) were independent factors that influenced the choice of anesthesiology. Conclusion: we recommend the succeeding: 1) Support students in their choice;2) Correct misconceptions about certain specialties;3) Promote clinical clerkship;4) Encourage mentorship;5) Increase the salary of at-risk specialties.

关键词： Anesthesiology Career Choice Influencing Factors Resident Doctor

Characterisation and seasonal variations of particles in the atmosphere of rural, urban and industrial areas：Organic compounds

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Journal of Environmental Sciences 2016年第6期28卷 45-56页

作者： Fabrice Cazier Paul genevray Dorothée Dewaele Habiba Nouali Anthony Verdin Frédéric Ledoux Adam hachimi Lucie Courcot Sylvain Billet Saad Bouhsina Pirouz Shirali guillaume garcon Dominique Courcot Common Center of Measurements (CCM) Univ. Littoral Cote d'Opale F-59140 Dunkirk France Unit of Environmental Chemistry and Interactions with Life UCEIV-EA4492 Univ. Littoral Cote d'Opale F-59140 Dunkirk France MicroPolluants Technologie SA 4 Rue de Bort Les Orgues F-57070 Saint Julien Les Metz France Oceanology and geosciences Laboratory LOG UMR 8187 Univ. Littoral C6te d'Opale F-62230 Wimereux France Impact of Chemical Environment on Human Health Univ. Lille CHU Lille Institut Pasteur de Lille EA4483-IMPECS 59000 LILLE France

Atmospheric aerosol samples（PM2.5–0.3, i.e., atmospheric particles ranging from 0.3 to2.5 μm） were collected during two periods： spring–summer 2008 and autumn–winter 2008–2009, using high volume samplers equipped with cascade impactors. Two sites located in the Northern France were compared in this study： a highly industrialised city（Dunkirk） and a rural site（Rubrouck）. Physicochemical analysis of particulate matter（PM） was undertaken to propose parameters that could be used to distinguish the various sources and to exhibit seasonal variations but also to provide knowledge of chemical element composition for the interpretation of future toxicological studies. The study showed that PM2.5–0.3concentration in the atmosphere of the rural area remains stable along the year and was significantly lower than in the urban or industrial ones, for which concentrations increase during *** concentrations of polycyclic aromatic hydrocarbons（PAHs）, dioxins, furans and dioxin like polychlorinated biphenyls（DL-PCBs）, generated by industrial activities, traffic and municipal wastes incineration were detected in the samples. Specific criteria like Carbon Preference Index（CPI） and Combustion PAHs/Total PAHs ratio（CPAHs/TPAHs） were used to identify the possible sources of atmospheric pollution. They revealed that paraffins are mainly emitted by biogenic sources in spring–summer whereas as in the case of PAHs, they have numerous anthropogenic emission sources in autumn-winter（mainly from traffic and domestic heating）.

关键词： Environmental monitoring Airborne particles PAHs Paraffins Dioxins

Air Flow Prediction and Evaluation of Ventilation Effectiveness with Different Zonal Configurations

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Journal of Energy and Power Engineering 2013年第2期7卷 277-282页

作者： Nasreddine guerfala hachimi Fellouah Ahmed Daoud Nicolas galanis Department of Mechanical Engineering Universite de Sherbrooke Sherbrooke JIK 2R1 Quebec Canada The lnstitut de recherche d'Hydro-Quebec (IREQ) Energy Technology Laboratory (L TE) Shawinigan G9N 7N5 Quebec Canada

This paper proposes a numerical method for the study of ventilation efficiency in buildings. The developed model is validated with the experimental results of Nielsen who tested the isothermal flow in a scaled model of a ventilated room. A zonal method is used to predict airflow patterns in the same ventilated room. The different equations governing the flow in the room were coded in Matlab for different operating conditions, different zonal configurations of the room and different number of cells （control volumes）. The efficiency of the ventilation was determined by calculating the number of ACH （air changes per hour） for each cell. The present results show the importance of the inlet air flow rate, the space resolution and the jet inlet dimensions on the determination of air quality.

关键词： Air flow zonal method numerical simulation ventilated room ventilation efficiency.

COVID-19: Lymphocyte Subpopulations Monitoring in Critically Ill Patients

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International Journal of Clinical Medicine 2020年第8期11卷 465-473页

作者： Amra Ziadi Abdelhamid hachimi Raja Hazime Imane Brahim Brahim Admou Fouzia Douirek Ahmed R. el Adib Said Younous Abdenasser M. Samkaoui Polyvalent Intensive Care Unit Arrazi Hospital Mohammed VIth University Centre Cadi Ayyad University Marrakech Morocco Medical Intensive Care Unit Arrazi Hospital Mohammed VIth University Centre Cadi Ayyad University Marrakech Morocco Laboratory of Immunology Centre of Clinical Research Mohammed VIth University Centre Cadi Ayyad University Marrakech Mo-rocco Polyvalent Intensive Care Unit Child and Mother Hospital Mohammed VIth University Centre Cadi Ayyad University Marrakech Morocco

Background: The alteration of lymphocyte subpopulations can help to predict the severity and the prognosis of severe Coronavirus disease 2019 (COVID-19). Our goal was to describe the kinetics of lymphocyte subsets, an... 详细信息

g>Background: g>The alteration of lymphocyte subpopulations can help to predict the severity and the prognosis of severe Coronavirus disease 2019 (COVID-19). Our goal was to describe the kinetics of lymphocyte subsets, and their impact on the severity and mortality in critically ill COVID-19 patients. g>Methods: g>We collected demographic data, comorbidities, clinical signs on admission, laboratory findings on admission then a follow-up during hospitalization. Lymphocyte subsets including CD3+ T cells, CD4+ T cells, CD8+ T cells, B cells, and natural killer (NK) cells were counted by flow cytometer. g>Results:g> On admission, we observed lymphopenia in 57% of cases, decreased CD3+ T cells in 76% of cases, decreased CD4+ T cells in 81% of cases, decreased CD8+ T cells in 62% of cases, decreased B cells in 52% of cases, and decreased natural killer (NK) cells in 33% of cases. After treatment, decreased CD3+ T cells, decreased CD4+ T cells, decreased CD8+ T cells, and decreased natural killer cells were predictor factors of mortality, in the univariable analysis.g> Conclusion:g> CD3+ T cells, CD4+ T cells, CD8+ T cells, and natural killer cells were predictor factors of severity, ICU mortality, and also a useful tool for predicting disease progression.

关键词： SARS-CoV-2 Coronavirus Disease 2019 Lymphocyte Subsets Critical Care Outcomes

Immunological Manifestations in Paraphenylene Diamine Poisoning

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International Journal of Clinical Medicine 2011年第4期2卷 435-438页

作者： Boubaker Charra Abdelhamid hachimi Abdellatif Benslama Norddine Habti Brahim Farouqi Said Motaouakkil 不详

Objective: Our aim is to establish the immunologic profile of PPD-intoxicated persons based on monitoring of the inflammatory reaction. Methods and patients: A prospective study of 21 patients hospitalized in a medical ICU with PPD intoxication during 2010. A follow-up of demographic, clinical, paraclinical, therapeutic and evolutive parameters as well as evaluation of the scores of gravity (SAPS II, APACHE II, OSF) was carried out in all our patients, and an inflammatory check-up (white blood cell, Creactive protein, C3 and C4 fractions of complement and lymphocyte subpopulations CD3, CD4, CD8 and CD19) was realized for all patients. The kinetic of these parameters was compared with clinical and paraclinical evolution. Results: The monitoring of the inflammatory reaction in our patients shows an evolution at three times for this reaction, with the first time of inflammatory stress during the first 3 days after the intoxication characterized by a relative immunodepression, the second time from the third day when the rhabdomyolysis exerts its pro-inflammatory power and the third time (from the sixth day) corresponds to the immunomodulative action of PPD and to its oxidative metabolism. It’s a systemic and specific inflammatory reaction to a cytotoxic cell support, which would explain the secondary worsening of the clinical and paraclinical parameters of our patients (hemodynamic shock, multivisceral failure, etc.). Conclusion: It seems that the immunological aspect may present the answer to several questions that rhabdomyolysis alone could not answer during PPD-poisoning. This study tried to establish a first immunologic profile of PPD-intoxicated persons, and to correlate it with their evolution.

关键词： Immunological Manifestations Inflammation Lymphocyte Paraphenylene Diamine Poisoning Rhabdomyolysis

Exceptional Association of a Cerebral Sinus Thrombosis and a guillain-Barre Syndrome: A New Case Report and Review of the Literature

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Case Reports in Clinical Medicine 2018年第6期7卷 391-396页

作者： Zakaria ghoummid Hassan Ait Bahssain Soukaina Kadiri Nisserine Louhab Najib Kissani Mina elkhayari Abdelhamid hachimi Medical ICU Cadi Ayyad University Mohammed VIth University Hospital of Marrakech Marrakesh Morocco Neurology Department Cadi Ayyad University Mohammed VIth University Hospital of Marrakech Marrakesh Morocco

Background: The association of guillain-Barre syndrome and cerebral sinus thrombosis is uncommon. Case Presentation: We report a 37-year-old patient hospitalized in medical ICU for respiratory distress following a guillain-Barre syndrome. He had symptomatic treatment in addition to plasma exchange. In the presence of clonic movements, a brain venography magnetic resonance showed a thrombophlebitis of the left lateral sinus, and hence a low-molecular-weight heparin treatment was begun. Immunological, thrombophilia and serological tests were negative. After a favorable evolution, he was transferred to the neurology department. Conclusion: The combination of a guillain-Barre syndrome and a cerebral sinus thrombosis would suggest a common process. A rigorous investigation, including the use of imaging, is necessary in front of any unusual clinical sign during a gBS.

关键词： Cerebral Sinus Thrombosis guillain-Barre Syndrome Plasma Exchange Venography Magnetic Resonance

Congenital gangrene in a Premature Newborn: A Case Report

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Open Journal of Pediatrics 2021年第3期11卷 393-397页

作者： Assetou Cissouma Mamadou B. Coulibaly Djibril Kassogué hachimi A. Poma Moussa Diassana Bathio Traoré Aly Diallo Layes Touré Ternan Traoré Moussa Kanté Abdoulaye Kissima-Traoré Pediatric Service Sikasso Hospital Sikasso Mali Pediatric Surgery Service Sikasso Hospital Sikasso Mali Pediatric Service Timbuktu Hospital Timbuktu Mali Surgery general Service Sikasso Hospital Sikasso Mali Orthopedic and Trauma Surgery Service Sikasso Hospital Sikasso Mali Anesthesia and Intensive Care Service Sikasso Hospital Sikasso Mali Cardiology Service Sikasso Hospital Sikasso Mali

Introduction: Congenital limb gangrene is a rare pathology. In the majority of cases, no cause is identified and its treatment is not codified. Observation: 29-week premature newborn, female from poorly followed twin ... 详细信息

g>Introduction:g> Congenital limb gangrene is a rare pathology. In the majority of cases, no cause is identified and its treatment is not codified. Observation: 29-week premature newborn, female from poorly followed twin pregnancy. Clinical examination at admission found an unstable neonate, the presence of necrosis of the left hand and forearm well limited, with absent humeral pulse and absence of hand movement. Surgical treatment was scheduled for amputation of the limb after the agreement of the parents whose postoperative follow-ups were simple. Conclusion: Congenital gangrene remains a rare entity in neonatology.

关键词： gangrene Upper Limb Newborn Prematurity