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Journal of Applied Mathematics and Physics 2015年第11期3卷 1522-1535页

作者： El Hadji Ndiaye Gokhan Sahin Moustapha Dieng amary thiam Hawa Ly Diallo Mor Ndiaye Grégoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal

In this study, a method for determining the intrinsic recombination velocity at the junction of a silicon solar cell is presented. The expression of intrinsic recombination velocity at the junction was established under irradiation in frequency modulation. Based on this expression, an electrical model of the intrinsic recombination velocity at the junction is presented.

关键词： Silicon Solar Cell Frequency Modulation Intrinsic Recombination Velocity at the Junction Irradiation Energy

Influence of Temperature and Frequency on Minority Carrier Diffusion Coefficient in a Silicon Solar Cell under Magnetic Field

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Energy and Power Engineering 2019年第10期11卷 355-361页

作者： Seydina Diouf Mor Ndiaye Ndeye thiam Youssou Traore Mamadou Lamine Ba Ibrahima Diatta Marcel Sitor Diouf Oulimata Mballo amary thiam Ibrahima Ly Grégoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Electromechanical Department Polytechnic School of Thiès Thiès Senegal.

In this study, the effects of temperature and frequency on minority carrier diffusion coefficient in silicon solar cell under a magnetic field are presented. Using two methods (analytic and graphical), the optimum temperature corresponding to maximum diffusion coefficient is determined versus cyclotronic frequency and magnetic field.

关键词： Solar Cell Diffusion Coefficient Temperature Magnetic Field Frequency

Capacitance of Vertical Parallel Junction Silicon Solar Cell under Monochromatic Modulated Illumination

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Journal of Applied Mathematics and Physics 2015年第11期3卷 1536-1543页

作者： Gokhan Sahin Moustapha Dieng Mohamed Abderrahim Ould El Moujtaba Moussa Ibra Ngom amary thiam Grégoire Sissoko Physics Department Faculty of Sciences and Techniques University of Cheikh Anta Diop Dakar Senegal

The aim of this study is to show the influence of the wavelength on the electrical parameters of vertical parallel junction silicon solar cell by use of impedance spectroscopy technique. The Bode diagrams of the diffusion capacitance are shown for different wavelengths while the solar cell operates under both open circuit and short circuit conditions. The Nyquist diagram of the diffusion capacitance has shown the extension of the space charge region for various wavelengths.

关键词： Vertical Parallel Junction Wavelength Capacitance Bode and Nyquist Diagrams

AC Recombination Velocity in the Back Surface of a Lamella Silicon Solar Cell under Temperature

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Journal of Modern Physics 2019年第10期10卷 1235-1246页

作者： Youssou Traore Ndeye thiam Moustapha thiame amary thiam Mamadou Lamine Ba Marcel Sitor Diouf Ibrahima Diatta Oulymata Mballo El Hadji Sow Mamadou Wade Grégoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Laboratory of Sciences and Techniques of Water and Environment Polytechnic School of Thiès Thiès Senegal University Assane SECK Ziguinchor Senegal

The ac recombination velocity of the excess minority carriers, in the back surface of a silicon solar cell with a vertical junction connected in series, is developed through Einstein’s law giving the diffusion coefficient of minority carriers according to temperature, through mobility. The frequency spectrum of both, amplitude and phase, are produced for the diffusion coefficient and the recombination velocity in the rear face, in order to identify the parameters of equivalent electric models.

关键词： Vertical Multi-Junctions Solar Cell AC Back Surface Recombination Velocity Temperature Bode and Nyquist Diagrams

Influence of Both Magnetic Field and Temperature on Silicon Solar Cell Base Optimum Thickness Determination

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Journal of Modern Physics 2019年第13期10卷 1596-1605页

作者： Nouh Mohamed Moctar Ould Mohamed Ousmane Sow Sega Gueye Youssou Traore Ibrahima Diatta amary thiam Mamour Amadou Ba Richard Mane Ibrahima Ly Gregoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal University Institute of Technology University of Thiès Thiès Sénégal Ecole Polytechnique de Thiès Thiès Sénégal

The minority carrier’s recombination velocity at the junction and at the back surface is used for the modeling and determination of the optimum thickness of the base of a silicon solar cell in the static regime, under magnetic field and temperature influence. This study takes into account the Umklapp process and the Lorentz effect on the minority carriers photogenerated in the base.

关键词： Silicon Solar Cell Diffusion Coefficient Surface Recombination Velocity Optimum Base Thickness Lorentz and Umklapp Processes

Correlation between Total PSA Level and the Histoprognostic Gleason Score

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Open Journal of Pathology 2024年第2期14卷 69-80页

作者： Fabrice Senghor Ibou thiam Kor Ndiaye Kassoum Badji Department of Pathological Anatomy H&#244pital de La Paix Ziguinchor Senegal Department of Pathological Anatomy CHU Aristide le Dantec Dakar Senegal

Prostate cancer is a public health problem in Senegal. It is one of the most common cancers in men and can be detected early by PSA measurement and confirmed by the pathological study which specifies the histological type and evaluates the histoprognostic scores (Gleason and pTNM). We did not find any anatomopathological study highlighting a link between the PSA t rate and histoprognostic Gleason scores in Senegal. Objective: We carried out this work aimed at determining whether there is a correlation between the PSA t rate and the histoprognostic Gleason score, in our context. Methodology: This is a retrospective, descriptive and analytical study conducted from January 2013 to October 2021, based on histologically proven prostate cancer cases with a specified PSA level, diagnosed in the pathological anatomy and cytology laboratory of Aristide Le Dantec hospital. Results: We identified 654 cases of prostate cancer. The average age was 68.59 ± 5.8 years with extremes of 40 years to 92 years. More than half of our cohort presented a clinical stage T2c, i.e. 56.94%. The average prostate volume on ultrasound was 81.81 ± 66 cc. The median PSA t was 110.5 ng/ml, with extremes ranging from 2 ng/ml to 74,770 ng/ml. Prostatic adenocarcinoma was the only histological type found in our patients. There was a predominance of Gleason score 6 (PICU grade group 1) observed in 35.17% of patients. Well-differentiated cancers were predominant and represented 35.17%. There was a statistically significant positive correlation between PSA t level and Gleason score (Spearman’s Rho = 0.305, p = 0.000). Conclusion: This study shows that in the Senegalese population, in patients with prostate cancer, the higher the PSA t level rises above normal, the higher the Gleason score tends to be.

关键词： Prostate Cancer PSAt Gleason Dakar

Contribution of Anti-p63 Antibodies in the Interpretation of Benign Label Prostatic Biopsies

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Open Journal of Pathology 2024年第2期14卷 31-44页

作者： Ibou thiam Fabrice Senghor Frenette Codja Kor Ndiaye Mohamed Moustapha Cherif Dial Pathological Anatomy Department Aristide Le Dantec University Hospital Dakar Senegal Pathological Anatomy Department H&#244pital de la Paix Ziguinchor Senegal Pathological Anatomy Department Idrissa Pouye University Hospital Dakar Senegal

Introduction: Prostate cancer is the second most common cancer in men. The diagnosis is most often based on the prostate biopsies’ analysis and on histological criteria recognizable on standard coloring. In some cases, the use of immunohistochemistry is important. Objectives: This paper aims to specify the p63 phenotypic profile of lesions diagnosed benign, with minimal suspect foci, difficult to interpret, HGPIN (high grade intraepithelial neoplasia) and LGPIN (low-grade prostatic intraepithelial neoplasia) and evaluate the manual technique of p63 immunohistochemistry. Patients and Method: This was a retrospective, descriptive study of prostate biopsies recorded in the PAC service of the HALD from January 1st, 2018 to December 31st, 2018. It was completed by a manual immunohistochemical study of the blocks enrolled from November 19th to December 4th, 2020 in the PAC department of the HPD. The studied parameters were: registry number, age, clinical stage, prostate volume, PSA level, microscopic appearance and p63 immunohistochemical profile. Results: Our study included 60 prostate biopsies. The ages of our patients varied from 45 to 77 years, with an average of 64.2 years and a standard deviation of 6.2. The majority of patients were at clinical stage cT2b (33%) with a prostate volume varying between 33.15 and 169.4 cc. The minimum value of PSA in our series is 5 ng/ml, the maximum being 100 ng/ml with an average level of 24.1 ng/ml and a standard deviation of 21.2. Our series included 50 adenomyomatous hyperplasias, 7 adenomyomatous hyperplasias associated with chronic prostatitis, 2 HGPIN and 1 LGPIN. After re-reading we found 5 discordant cases, which corresponded to minimal suspect foci (kappa = 0.5098). The p63 marking was informative in 53 cases, i.e. 88%, and non-informative in 7 cases, i.e. 12%. Among the uninformative markings, 2 were due to lack of tissue adhesion to the slides. Among the informative markings, 11 were negative. p63 immunohistochemistry was

关键词： Prostate Cancer Diagnosis Anti-p6 Antibody

Intraductal Prostatic Carcinoma: Epidemiological and Anatomopathological Aspects in Dakar

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Open Journal of Pathology 2024年第2期14卷 54-63页

作者： Ibou thiam Fabrice Senghor Omar Sow Kor Ndiaye Mohamed Moustapha Chérif Dial Anatomical Pathology Department Aristide Le Dantec University Hospital Dakar Senegal Anatomical Pathology Department Peace Hospital Ziguinchor Senegal General Surgery Department Peace Hospital Ziguinchor Senegal Anatomical Pathology Department Idrissa Pouye University Hospital Dakar Senegal

Introduction: Intraductal carcinoma is often associated with high-grade, high-stage adenocarcinoma. Its frequency is variable and it is considered a poor prognostic factor. In our context, when prostatic carcinoma is diagnosed, pathologists do not always report the presence of this anatomopathological entity. We therefore conducted a study to determine the epidemiological and anatomopathological profile of patients with this lesion in Dakar. Materials and Methods: This is a retrospective descriptive study covering a 1-year period from January to December 2022. It focused on cases of intraductal carcinoma diagnosed among prostatic carcinomas collected in the anatomopathology laboratories of Hôpital Général Idrissa Pouye (HOGIP) and Hôpital Militaire de Ouakam (HMO). It was based on archives of anatomopathological reports, blocks and slides. A total of 200 cases of prostatic carcinoma were collated and reviewed to identify those presenting with intraductal carcinoma according to the diagnostic criteria of Guo and Epstein. Results: 87 cases of intraductal carcinoma were found, representing 43.5% of prostatic carcinomas. The mean age was 71 years. Patients in their seventh decade were the most represented, i.e. 42.5%. The majority of samples examined were biopsies (72.4%). The mean PSA level was 965.91 ng/ml, with extremes ranging from 0.03 to 10,000 ng/ml. Histologically, 96.5% of cases (N = 84) were invasive prostatic carcinoma. Gleason score 8 (4 + 4) was the most common, accounting for 42.53% (N = 37). On average, the study found four (04) foci of intraductal carcinoma per specimen, with extremes ranging from 1 to 30. Dense cribriform architecture accounted for 78.16%, loose cribriform for 11.5%, solid for 8.04% and micropapillary for 2.3%. Six cases (6.9%) showed foci of comedonecrosis. The vast majority of radical prostatectomies (87.5%) were classified as pT3. Node invasion and perineural sheathing were observed in 12.5% and 52.32% of cases respectively. Conclusi

关键词： Intraductal Carcinoma Prostate Pathological Anatomy Senegal

Neuroanatomical Basis of Postoperative Pain and Assessment of Its Management in a Series of Patients Undergoing Caesarean Sections

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Pain Studies and Treatment 2024年第2期12卷 21-32页

作者： Moustapha Diedhiou Philippe Manyacka Ma Nyemb Ndiamé Sarr Aissatou Sarr Ousmane thiam Mohamed Lamine Fall Health Sciences Training and Research Unit Gaston Berger Saint Louis University Saint Louis Senegal Intensive Care Unit Saint Louis Regional Hospital Saint Louis Senegal

Introduction: In recent decades, the cost of postoperative pain has been the subject of many studies based on protocols developed by scientific societies for its assessment and optimization. At the Regional Hospital of Saint-Louis (Senegal), several protocols have been developed for pain management, but no study has focused on the assessment of postoperative pain management specifically. We therefore initiated this work, the objectives of which were to remind the neuroanatomical and neurophysiological bases of postoperative pain, and to analyze the assessment and management of this pain in patients who have undergone a caesarean section. Materials and methods: This was a prospective and descriptive study, which took place in the gynecology-obstetrics department, over a period from January 2019 to July 2020. All patients who gave birth by cesarean section were included. The data was collected from a survey sheet written for this purpose. For each of the patients, the information was taken every day throughout the duration of postoperative hospitalization. Results: It appears from our work that after a cesarean section, the pain felt evolves on the first postoperative days with a peak during the second day. As in the data reported in the literature, there does not seem to be a difference in terms of pain intensity and analgesia dosage between scheduled and emergency caesarean sections. However, young age and female gender—for other types of surgeries—are risk factors associated with high postoperative pain scores. This trend is probably related to the low pain experience of tested patients. Our initial hypothesis was that acute post-operative pain after caesarean sections could be linked to defects in the perception and processing of pain by caregivers. Indeed, we have shown that awareness-raising, information, and training actions have made it possible to significantly improve the management of pain after a cesarean section. Conclusion: After a cesarean section the p

关键词： Postoperative Pain Neuroanatomical Bases Assessment Cesarean Section

《欧盟Natech风险管理框架》下的环境风险管理体系及其对我国的启示

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环境科学研究 2024年第5期37卷 1162-1168页

作者：陈强凌郡鸿邱顺添天津大学环境科学与工程学院天津300072

国际上将由自然灾害引发的技术事故称为Natech(natural hazard triggered technological disasters).作为全球工业大国和自然灾害最为严重的国家之一.我国自然灾害种类多、发生频率高,极易引发技术事故,造成严重的人员伤亡、经济损失和... 详细信息

国际上将由自然灾害引发的技术事故称为Natech(natural hazard triggered technological disasters).作为全球工业大国和自然灾害最为严重的国家之一.我国自然灾害种类多、发生频率高,极易引发技术事故,造成严重的人员伤亡、经济损失和环境破坏.世界工业强国如日本、法国以及欧盟地区等较早地针对这类事件展开研究并制定政策,而中国相关研究还处于起步阶段.2022年欧盟发布的《欧盟Natech风险管理框架》为其成员国的Natech风险防控提供了目标、原则和方法.该研究全面综述了欧盟Natech风险管理框架,从关注事件特点及主要挑战、风险管理、风险评估要素到减轻风险方法的主要内容,同时系统总结了欧盟Natech风险识别、评价、应对措施等方面的先进理念,并通过与中国Natech风险管理现状及问题的对比分析,提出了对未来中国Natech风险管理的启示和建议:①加大Natech风险防控科研投入;②提升数字化平台建设水平;③加强Natech风险预防措施;④考虑全球气候变化影响.该研究试图通过学习、借鉴和吸收国际Natech风险管理的有益经验,为中国的Natech风险管理提供新思路和新方法.

关键词： Natech 风险识别风险管理风险评估风险应对