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Back Illuminated N/P/P+Bifacial Silicon Solar Cell under Modulated Short-Wavelength: Determination of Base Optimum Thickness

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Energy and Power Engineering 2021年第5期13卷 207-220页

作者： Mamadou Sall Dianguina Diarisso Mame faty Mbaye fall Gora Diop Mor Ndiaye Khady Loum Gregoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology Cheikh Anta Diop University Dakar Senegal University Institute of Technology University of Thiès Thiès Sénégal Ecole Polytechnique de Thiès Thiès Sénégal

A bifacial silicon solar cell under monochromatic illumination in frequency modulation by the rear side is being studied for the optimization of base thickness. The density of photogenerated carriers in the base is obtained by resolution of the continuity equation, with the help of boundary conditions at the junction surface (n+/p) and the rear face (p/p+) of the base. For a short wavelength corresponding to a high absorption coefficient, the AC photocurrent density is calculated and represented according to the excess minority carrier’s recombination velocity at the junction, for different modulation frequency values. The expression of the AC recombination velocity of excess minority carriers at the rear surface of the base of the solar cell is then deduced, depending on both, the absorption coefficient of the silicon material and the thickness of the base. Compared to the intrinsic AC recombination velocity, the optimal thickness is extracted and modeled in a mathematical relationship, as a decreasing function of the modulated frequency of back illumination. Thus under these operating conditions, a maximum short-circuit photocurrent is obtained and a low-cost bifacial solar cell can be achieved by reducing material (Si) to elaborate the base thickness.

关键词： Bifacial Silicon Solar Cell AC Recombination Velocity-Base Thickness Short-Wavelength

AC Back Surface Recombination Velocity in n+-p-p+Silicon Solar Cell under Monochromatic Light and Temperature

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Journal of Electromagnetic Analysis and Applications 2021年第5期13卷 67-81页

作者： Mame faty Mbaye fall Idrissa Gaye Dianguina Diarisso Gora Diop Khady Loum Nafy Diop Khalidou Mamadou Sy Mor Ndiaye Gregoire Sissoko Ecole Polytechnique de Thiès Thiès Sénégal Institute of Technology University of Thiès Thiès Sénégal Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal

Excess minority carrier’s diffusion equation in the base of monofaciale silicon solar cell under frequency modulation of monochromatic illumination is resolved. Using conditions at the base limits involving recombination velocities Sf and Sb, respectively at the junction (n+/p) and back surface (p+/p), the AC expression of the excess minority carriers’ density δ (T, ω) is determined. The AC density of photocurrent Jph (T, ω) is represented versus recombination velocity at the junction for different values of the temperature. The expression of the AC back surface recombination velocity Sb of minority carriers is deduced depending on the frequency of modulation, temperature, the electronic parameters (D (ω)) and the thickness of the base. Bode and Nyquist diagrams are used to analyze it.

关键词： Silicon Solar Cell AC Back Surface Recombination Velocity Temperature Bode and Nyquist Diagrams

Diffusion Coefficient at Resonance Frequency as Applied to n+/p/p+ Silicon Solar Cell Optimum Base Thickness Determination

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Journal of Electromagnetic Analysis and Applications 2020年第10期12卷 145-158页

作者： Amadou Mar Ndiaye Sega Gueye Mame faty Mbaye fall Gora Diop Amadou Mamour Ba Mamadou Lamine Ba Ibrahima Diatta Lemrabott Habiboullah Gregoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Ecole Polytechnique de Thiès Thiès Sénégal Département Génie Electrique Ecole Supérieure Polytechnique de Nouakchott Nouakchott Mauritanie

The modelling and determination of the geometric parameters of a solar cell are important data, which influence the evaluation of its performance under specific operating conditions, as well as its industrial development for a low cost. In this work, an n+/p/p+ crystalline silicon solar cell is studied under monochromatic illumination in modulation and placed in a constant magnetic field. The minority carriers’ diffusion coefficient (D(ω, B), in the (p) base leads to maximum values (Dmax) at resonance frequencies (ωr). These values are used in expressions of AC minority carriers recombination velocity (Sb(Dmax, H)) in the rear of the base, to extract the optimum thickness while solar cell is subjected to these specific conditions. Optimum thickness modelling relationships, depending respectively on Dmax, ωr and B, are then established, and will be data for industrial development of low-cost solar cells for specific use.

关键词： Silicon Solar Cell Resonance Frequency Magnetic Field Recombination Velocity Base Thickness

Scapula Fracture in a Child: Report of a Rare Injury

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Open Journal of Pediatrics 2023年第2期13卷 158-163页

作者： Florent Tshibwid A. Zeng Mbaye fall Nankouman Konaté faty Balla Lô Eben-Ezer Samé Souleymane Camara Aimé Lakh Faye fall Oumar Ndour Gabriel Ngom Department of Pediatric Surgery Aristide Le Dantec University Teaching Hospital Cheikh Anta Diop University Dakar Senegal Department of Pediatric Surgery Albert Royer National Children’s Hospital Center Cheikh Anta Diop University Dakar Sene-gal

Scapular fracture is exceptional in children, mainly occurring after high-energy trauma. Radiologic investigations help its diagnosis and classification, which determines its management. We report the case of a 14-year-old patient admitted for blunt trauma of the left shoulder after falling from a speeding car. The diagnosis of a displaced fracture of the body of the scapula was made, and non-operative treatment was indicated and carried out for four weeks, followed by physiotherapy for another four weeks. Nine weeks after the trauma, the mobility of the affected shoulder was equivalent to that of the contralateral shoulder.

关键词： Fracture Scapula Child Non-Operative Management Case Report

Design and Realization of a UV-C Based Disinfection Tools Monitored by Mobile Application

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Open Journal of Applied Sciences 2022年第1期12卷 155-163页

作者： Baba Ngom Mouhamadou Thiam Mame faty Mbaye Moussa Sow Khadim Hann Mamadou Wade Laboratoire Sciences et Techniques de l’Eau et de l’Environnement (LASTEE) Ecole Polytechnique de Thiès (EPT) Thiès Sénégal

In many outbreaks, patients and healthcare workers are particularly at risk from nosocomial infections as a result of non-effective disinfection methods. With increasing incidence of viral infections such as severe acute respiratory syndrome, in one hand, and the increase in the rate of antibiotic resistant bacteria associated with nosocomial infections in other hand, there is a need to design novel engineering tools for inactivation of nosocomial pathogens. Ultraviolet germicidal irradiation (UVGI) is considered as a promising method to inactivate bacteria and viruses. This paper presents UV-C Based disinfection tools monitored by mobile application, designed for hospital and Epidemic Treatment Center. The evolution of the irradiation intensity over time was evaluated, and the theorical disinfection duration for several nosocomial pathogens was determined. In the case of SARS-CoV2, less than 12 minutes were needed to achieve 99.99% viral reduction in a room of 36 sqm.

关键词： Disinfection UVGI SARS-CoV2 Nosocomial Infections

A Chronic Dysphony Caused by a Bifocal and Pulmonary Laryngeal Tuberculosis

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International Journal of Otolaryngology and Head & Neck Surgery 2023年第2期12卷 55-60页

作者： Aliou faty Abdou Sy Ndeye Fatou Ngom Djibril Balde Khadim Diouf Ndadi Tchiengang Kadielle Junie Heinrich Lübke Regional Hospital Centre of Diourbel Diourbel Senegal Children’s Hospital of Diamniadio Dakar Senegal Departement of Medecine Bambey Alioune Diop University Diourbel Senegal Sociale Hygiene Institute Dakar Senegal Regional Hospital Centre of Sédhiou Sédhiou Senegal

Laryngeal tuberculosis is a rare entity. We consider the case of a woman of 62 who presented a one-year evolving chronic dysphonia chart associated with cough, febricula and general health damage. The nasofibroscopy showed a budding ulcerous lesion of the larynx a priori evoking a granulomatous lesion or cancer. The BAAR spits were strongly positive and the radiographic pictures of the thorax, typically evoked a pulmonary tuberculosis. Seeing the excellent therapeutic response to TB treatment in 4 months period, the bifocal tuberculosis diagnostic was confirmed.

关键词： Tuberculosis Dysphonia Larynx Lungs

Indications and Results of Parotidectomies in the Orl Department of the Idrissa Pouye General Hospital in Dakar. Concerning 31 Cases

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International Journal of Otolaryngology and Head & Neck Surgery 2023年第6期12卷 375-384页

作者： Oumou Amadou Diallo Aliou faty Hady Tall Alimou Synayoko Alpha Oumar Diallo Malick Ndiaye Bay Karim Diallo ENT Department of The Saint Louis Regional Hospital Saint Louis Senegal ENT Department Heinrich Regional Hospital Diourbel Senega ENT Department H&#244pital National Ignace Deen Guinea Conakry Guinea ENT Department Diamniadio Children’s Hospital Dakar Senegal ENT Department Albert Royer Children’s Hospital Dakar Senegal

Introduction: The parotid tumors are benign or malignant, primary or secondary neoformations developed at the expense of the parotid gland. The aim of the present study was to describe the indications and results of parotidectomies in the ENT department of the Idrissa Pouye General Hospital in Dakar. Patients & Methods: We conducted a retrospective study between January 1, 2004 and December 31, 2012, including all patients who had been consulted for a parotid tumor with or without histological evidence collected in the otolaryngology and anatomy-pathology department of the Idrissa Pouye General Hospital in Dakar. Results: We collected 31 patient files. The mean age was 47.45 years, with extremes of 16 and 74 years. Females predominated, with a sex ratio of 0.82. Swelling of the parotid region was the main reason for consultation in 100% of cases. Parotidectomy was the most frequently performed procedure, accounting for 41.93%. Benign tumors accounted for 72% of cases, the majority being pleomorphic adenomas (50%). The outcome was favorable in 67.74% of cases. Conclusion: Management of parotid tumors at HOGIP would be improved by informing and educating patients to consult early, and by upgrading the technical platform.

关键词： Parotid Gland Parotid Tumor Pleomorphic Adenoma Epidemiology Clinic Treatment Dakar

Gallbladder Carcinoma of the Thyroid Revealed by an Acute Festered Thyroiditis: A Literature Study about a Case

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International Journal of Otolaryngology and Head & Neck Surgery 2023年第3期12卷 135-139页

作者： Aliou faty Hady Tall Abdou Sy Fulgence Abdou Faye Birame Loum Kevin Dimitri Manfoumbi Manfoumbi ENT Department Diourbel Heinrich Lübke Regional Hospital Centre Diourbel Senegal ENT Department Saint-Louis Regional Hospital Centre Saint-Louis Senegal ENT Department Children’s Hospital of Diamniadio Dakar Senegal Department of Medecine Bambey Alioune Diop University’s Diourbel Senegal ENT Department H&#244pital Principal de Dakar Dakar Sénégal

The cutaneous extension of gallbladder thyroid carcinoma is uncommon and is among the aggressive forms of the disease. We are reporting the case of a woman of 54 that shows acute festered thyroiditis worsened by a necrotic ulcer wound on the skin lasting 3 weeks amid a big neglected hetero-multinodular goitre, evolving since 20 years. The anatomopathological test showed a gallbladder thyroid carcinoma of the thyroid with severe inflammation. The treatment consisted of a complete thyroidectomy with recurrent bilateral dredging. There was a favourable evolution. Gallbladder carcinoma, in its aggressive aspect, may be linked to the occurrence of acute festered thyroiditis. Therefore, the prognosis of our patient was favourable.

关键词： Thyroiditis Gallbladder Carcinoma Suppuration

Urgent Urologic Surgery in Patients with Acute Coronary Syndrome

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Journal of Biosciences and Medicines 2022年第1期10卷 29-32页

作者： Tariq F. Al-Shaiji Jaffar M. Hussain Majd Al-Kabbani Mostafa A. faty Ahmed R. El-Nahas Abdullatif Al-Terki Urology Unit Department of Surgery Al-Amiri Hospital Kuwait City Kuwait

Urgent urologic interventions create a challenging scenario when they occur in patients suffering from concurrent acute coronary syndrome. Herewith we report two patients with this scenario. Case 1, a male patient was admitted with non-ST elevation myocardial infarction in which dual antiplatelet therapy was initiated. He developed symptomatic right obstructive uropathy. Case 2, a male patient developed non-ST elevation myocardial infarction and was commenced on dual antiplatelet therapy. Subsequently, he developed gross hematuria unresponsive to conservative measures. Urgent urological intervention was carried out while on aspirin in both cases with uneventful recovery. Upon coronary angiography, both cases were found to have multi-vessel disease requiring coronary artery by-pass graft later. Due to their concurrent urologic problems the patients described were not optimized fully to undergo coronary angiography. In close collaboration with cardiology, patients with acute coronary syndrome can be carefully selected to undergo urgent urologic interventions prior to coronary angiography/primary coronary intervention.

关键词： Acute Coronary Syndrome Urgent Urologic Conditions Urgent Urologic Intervention