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Journal of Materials Science and Chemical Engineering 2023年第12期11卷 34-45页

作者： Mamadou Yaya Balde Diaka sidibe Éric Severin Simo Bakam Chantale Djangang Njiomou Philippe Blanchart Laboratory of Applied Inorganic Chemistry University of Yaoundé 1 Yaoundé Cameroon Laboratory of Physical and Colloidal Chemistry Gamal Abdel Nasser University of Conakry Conakry Guinée Center for Waste Management Research (CREGED) Conakry Guinea Higher Institute of Mines and Geology of Boké (ISMGB) Boké Guinea Institute of Research for Ceramics (IRCER) Limoges France

The paper talks about the elaboration of geopolymer with two types of kaolinite clays containing muscovite. The kaolinite materials were first calcined at different temperatures, and mixed with an activator solution, called liquid precursor, at a different solid/liquid mass ratio depending on their normal consistency to produce geopolymer binders. Results show that the geopolymer products obtained from the different clays have good physichomechanical properties: their open porosity and their water absorption rate decrease while their compressive strength and their apparent density increase with the increase in calcination temperature of the clays. The density of GABD binders varies between 2.92 and 2.47 g/cm3 and that of GARD binders between 1.86 and 2.16 g/cm3. Specimens in the GABD series have the best mechanical performance, ranging from 14.43 to 31.37 MPa, while those in the GARD series oscillate between 6.18 and 11.56 MPa. These properties make kaolinite materials from this region suitable for use as construction materials for adequate waterproof structures.

关键词： Geopolymer Cements Kaolinitic Clays Muscovite Permeability Mechanical Strength

基于U盾支付系统的实现 ——几内亚银行研究案例

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基于U盾支付系统的实现 ——几内亚银行研究案例

作者：迪安（sidibe Dian）北京交通大学

学位级别：硕士

本文是对银行业交易及其在银行中的安全性进行研究和总结的总结。鉴于世界银行交易安全的发展,本论文解决了几内亚共和国中央银行的问题。考虑到银行交易的重要性和创新性,我在此论文上的选择促使我通过了解几内亚共和国的安全性,性能,... 详细信息

本文是对银行业交易及其在银行中的安全性进行研究和总结的总结。鉴于世界银行交易安全的发展,本论文解决了几内亚共和国中央银行的问题。考虑到银行交易的重要性和创新性,我在此论文上的选择促使我通过了解几内亚共和国的安全性,性能,简单性,灵活性,易行性,在几内亚共和国中央银行部署U盾。U盾是用于在线交易的完整工具.这几年以来,现代技术已将世界缩小为一个具有共同利益的全球性共同中心,并且几乎全部是通过技术来实现的。迄今为止,信息技术(IT:Information Technology)的发展正在转变为全球未来先进产业的关键因素实际上,所有以前大家使用的古老的银行付款方式都现在是为了世纪现代银行方式提供更好的方案。以前的传统银行业务方法长久时间很多年了,现在整个这些业务已经在特定的地区和国家(无论是在发达国家还是正在发展的国家)进行银行交易的最普遍的方法。如今,从业务观察来看,以市场中心为中心已转向以消费者为中心,以用户为最大目标。从本质上讲,IT的进步以及网络在商业交易中的利用日新月异,这在银行业企业中已取得了重大成果,现在的很多银行客户对银行的安全要求关于付款方式和许多职能功能使用限制欺诈风险并减少交易时间的高质量服务水平的需求被认为是一个巨大的挑战。在当前用户的需求中,当今设计的支付银行系统在包括在线或任何类型的移动支付操作符业务可能性在内的支付服务中代表了一个具有挑战性的问题。为了实现在线交易或银行用于转账的现代移动支付系统的开发和应用正变得越来越需求;如,通过保护个人数据免受在线欺诈,从而节省时间,快速付款,优化安全性。采用现代技术以确保为用户提供满意的服务是一项重大责任,这些责任包括账户余额查询,资金转账,账单支付,查找自动柜员机以及其他相关的支付方式。考虑到当今采用所有技术来实现现代系统的过高费用,在用户认证,数据机密性,不可否认性,数据完整性和服务可用性方面引起了很多关注。网络犯罪率每天呈指数增长,特别是在非洲急需技术的国家中,这是因为缺乏能够提供不同级别性能的多功能系统。一些银行(例如中国的银行)使用多功能系统,例如能够进行汇款或通过互联网在线或电力交易的货币。几内亚需要具有高度安全水平并能够面对犯罪袭击的这种创新系统。刑事攻击不只是网络安全和网络数据,而且还收集个人数据并在电子银行系统上进行攻击。一群流氓通过破坏安全性而连接到电子银行系统数据库,并通过非法手段获取客户的个人兴趣点(帐户数据,信用卡兴趣点,客户(ID:is required as proof of identity)标语等)。当犯罪分子在那一刻获得个人数据时,用户的帐户就无法防御攻击。这不是对客户造成的损害,而是银行。客户验证的成功方法包括不受限制,其中包括使用密码或客户ID(标识符),或区分证明卡和PIN(可识别的单独证明编号)。密码和(PIN:Personal Identification Number)码可能会因秘密卧底侦察而非法获得。几内亚是西非地区的国家;几内亚共和国中央银行(CBRG:Central bank of Republic of Guinea)的国家银行成立于1960年,是负责执行几内亚货币政策和汇率政策的机构。整个银行负责管理几内亚法郎(GNF:Guinea National Franc)的发行和发行。因此,在本文中分析和提出新的贡献也很重要,该贡献能够支持基于配置的支付程序,并且该算法系统实现了在三个不同级别的安全性下工作。关于现在的研究状态,几内亚共和国的银行支付方式使用的传统处理客户汇收款方式效率较低,很多客户要等待排队银行柜台代收,客户排队时间过长;这是传统处理汇收款方式非洲银行用的方式所以效率较低。很多客户对通过网点的系统处理业务目前不太熟悉而且网点的系统数目有限。银行将自身业务优先的处理方式导致客户不满意,有违方便客户办理业务的初衷,客观上降低了客户要的效率需求。几内亚共和国,这几年以来网店代收已经在全国变成非常大行业;所以本文在分析和研究同时也介绍U盾处理方案在银行网点的覆盖。网店代收主要分为银行代收和社会化代收。银行代收与U盾的用户营业厅代收方式类似。根据我们的实际问题分析和调研的数据分析发现的问题,几内亚共和国的银行的ATM利用率不高,整个银行只有两台,而且要排队好久。应对方法:营业厅人员主动积极推广(ATM:Automatic Teller Machine),在发现排队情况的时候,主动引导客户使用ATM终端,指导其操作流程,当客户熟悉了操作后,慢慢去接受ATM去办理业务。被视为世界上最现代的支付系统之一,中国银行开发了一种被称为“U盾”,一种U盘设备被银行使用为了能够保护并加强任何交易活动。本文研究内容主要采用U盾技术的实施来开发能够支持几内亚共和国支付平台中央银行的新密码学概念。本文创新点主要贡献如下:U盾付款

关键词： U盾银行支付平台密码系统私钥和公钥

Palpebral Reconstruction in a Secondary Ophthalmology Center in Mali: About a Case

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Surgical Science 2023年第2期14卷 97-103页

作者： Dembélé Adama sidibe Moro sidibe Oumar Dembele Ahmadou Poma Hachimi Amadou Abdoulaye Konaté Oumar Diallo Djonny Jonas Dembele Mamadou Adama Togo Kadiatou Ba Koita Abdoulaye Nouhoum Coulibaly Cheick Fantamady Tounkara Nouhoum Touré Napo Abdoulaye Régional Hospital of Sikasso Sikasso Mali Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali Center Médical Jean Marie Cissé Sikasso Mali

Introduction: Significant trauma to the periocular region can seriously damage ocular structures and their adnexa. The eyelids can be damaged during these traumas. The most frequent lesions are lacerations, the surgical treatment of which is generally simple. In some cases, there are complex traumas where there is a loss of tissue, which is difficult to treat. We report the case of a 26-year-old young man, farmer with no medical and surgical history, referred by the odontostomatology and maxillofacial surgery department for burns to the left hemi face by the exhaust pipe of his motorbike which occurred following a public road accident (AVP). Observation: A 26-year-old young man with no medical-surgical history, visual acuity was 5/10 with good mobility of the globe. In collaboration with the maxillofacial surgeon, a graft of the hemi face was performed using a flap from the inner side of the thigh first. In the second time we carried out a recovery by a flap which consisted in taking a supra-superciliary flap and suturing it at the level of the palpebral edges which, in spite of a fragile vitality of the tissues. Conclusion: The reconstruction of the eyelid is a real problem in our service because of the technical platform and the availability of consumables, which limits us in the choice of the operating technique.

关键词： Road Accident Hemi-Face Burn Eyelid Reconstruction

Fortuitous Discovery of a Multifocal Enchondromatosis in a Case at the “Luxembourg” Hospital Center in Bamako

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Open Journal of Radiology 2022年第4期12卷 222-228页

作者： Mamoudou Camara Aboubacar Sidiki Keita Mahamane Mariko Toumin Camara Issa Cisse Aly Traore Souleymane Sanogo Siaka sidibe Center for Medical Imaging Exploration and Diagnosis Gamal Abdel Nasser University Conakry Guinea Medical Imaging Department CHU Mother-Child “Luxembourg” Bamako Mali Medical Imaging Department North Franche Comté Hospital Trevenans France Internal Medicine Department Siguiri Prefectural Hospital Siguiri Guinea Hemodialysis Department of CHU Donka Conakry Guinea Medical Imaging Department CHU Point G Bamako Mali

The aim of this study was to clarify the interest of standard radiography in the management of Ollier’s disease. Observation: Enchondromas are benign lesions that may present on imaging with nonspecific features in children, and they are relatively large lesions, with frequent endosteal erosion and rare matrix mineralization. We report a case of predominantly right-sided multifocal enchondromatosis in a 5-year-old girl with no known medical history, diagnosed fortuitously on standard radiography during a trauma assessment and confirmed by histology. No sign of pain was noted after a 6-month follow-up. But the radiographic control noted signs of diffuse osteoarthritic remodeling in the surgical areas and early fusion of the growth cartilages. Conclusion: Ollier’s disease is rare, you have to know how to think about it in the face of fortuitous discoveries, especially at an early age. Enchondromas are benign lesions that may present on imaging with nonspecific features in children. In all cases, standard radiography is essential in the diagnosis and follow-up of Ollier’s disease.

关键词： Enchondromatosis Fortuitous Girl Standard Radiography

Bilateral Central Serous Chorioretinopathy (CRSC) in Pregnancy Complicated with Retroplacental Hematoma: About a Case

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Open Journal of Ophthalmology 2023年第1期13卷 13-22页

作者： Daouda Goita Moro sidibe Mala Sylla Nana Wangara Mamadou Kolé sidibe Adama Dembele Gounon Saye Abdoulaye Napo Nouhoum Guirou Adama Guindo Mamadou Adama Togo Abdoulaye Nouhoum Coulibaly Oumar Diallo Japhet Popanou Thera Lamine Traore BOUGOUNI Reference Health Center Bougouni Mali Sikasso Regional Hospital Mali/Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali Institute of Tropical Ophthalmology of Africa Bamako Mali/Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali Alliance for the Development of Community Ophthalmology (ADOC) Bamako Mali National Eye Health Program Bamako Mali

Introduction: Central serous chorioretinopathy (CSCR) is associated with serous sensorineural retinal detachment in the macular region. The condition that affects the male gender more than their female counterpart results from focal leakage disturbance of retinal pigment epithelial cells and choroidal abnormalities. The corticosteroid is highlighted as one of the major factors that promote the occurrence of CSCR. Stress and pregnancy, especially in the third trimester, have also been reported by some authors. Central serous chorioretinopathy associated with pregnancy complicated by retroplacental hematoma is a rare event. Observation: We report the case of a pregnant woman at approximately 34 weeks of amenorrhea who presented a sudden and severe drop in visual acuity on a pregnancy complicated by retroplacental hematoma and delivered by cesarean section. The diagnosis was based on clinical arguments associated with photos of the retina made by the MII Ret Cam device (Made In India, Retinoscope Camera) highlighting the lifting of the macular region. Ophthalmological monitoring without medical or physical treatment was instituted. At two months of progression without treatment, bilateral visual acuity was 10/10. Conclusion: Central serous chorioretinopathy and pregnancy is not unusual;however, its bilateral and brutal form in a context of pregnancy complicated by retroplacental hematoma is rare. Despite this favorable evolution, monitoring remains necessary in order to prevent recurrences and complications.

关键词： MII Ret Cam Central Serous Chorioretinitis Retroplacental Hematoma

Aging Experiences among Older People in Conakry/Guinea: Towards an Age-Friendly City and Community

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Advances in Aging Research 2023年第4期12卷 67-86页

作者： Mamadou Dioulde Balde Alpha Oumar Sall Tiany sidibe Madeleine Toure Ramata Diallo Aissatou Diallo Sadan Camara Center for Research in Reproductive Health in Guinea (CERREGUI) Conakry Guinea

Older people are a demographically significant group, who represent a vulnerable layer within conditions for active and healthy aging that may be lacking in both urban and rural areas. Objective: To identify the main barriers and opportunities for the establishment of age-friendly cities and communities in a low-income country. Methods: This was a qualitative study that involved focus group discussions with older people, and service providers (health and social services) in the city of Conakry. The older people were purposively selected with the support of older people associations, and men and women were equally represented in the sample. Results: The analysis focused on the experience of old age as well as the barriers and opportunities for active healthy aging specific to the sub-Saharan context. The results indicate that a good quality of life for older adults boils down to the acquisition of good health and decent housing. Other concerns frequently reported were food and education problems for their children and security. Conclusion: This study contributes to strengthening the understanding of the age-friendly cities and communities’ approach in the context of sub-Saharan African countries.

关键词： Older People Age-Friendly Cities and Communities Barriers Opportunities Conakry

Left Pyelic Bifidity and Ectopic Ureteral Superolateral Intravesical Homolateral Ectopic Junction Revealed by a Urinary Calculus Apropos of a Case at the Pasteur Clinic

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Open Journal of Medical Imaging 2022年第3期12卷 123-130页

作者： Abdoulaye Kone Oucoumba Diarra Mamoudou Camara Youssouf Kone Abba Ata Omar Moussa Traore Ibrahima Coulibaly Moussa Konate Kassim sidibe Toumin Camara Youssouf Diawara Cheick Oumar Toure Abdoulaye Mody Camara Salia Coulibaly Mahamadou Diallo Adama Diaman Keita Aboubacar S. Ndiaye Siaka sidibe Faculty of Medicine and Odontostomatology Bamako Mali Medical Imaging Department of the University Hospital of Point G Bamako Mali Radiology Department of CSREF Commune III Bamako Mali Medical Imaging Service Mother Child Hospital Luxembourg Bamako Mali FSTS Gamal Abdel NasserConakry Guinea Radiology Department of the Jacques Boutard Hospital Saint-Yrieix-la-Perche France France Medical Imaging Department of the Pasteur Polyclinic Bamko Mali DCSSA Bamako Mali General Medicine Department of the Siguiri Prefectural Hospital Siguiri Guinea Medical Imaging Service Health Center of Ref Commune IV Bamako Mali Medical Imaging Department of Mali Hospital Bamako Mali Medical Imaging Department of KATI Hospital Bamako Mali Medical Imaging Department of GABRIEL TOURE Hospital Bamako Mali

Introduction: Malformations of the excretory tract are abnormalities due to a disorder of embryogenesis. According to some authors, their frequency varies from 0.30 to 5.25 per 1000. The aim of this study was to highlight the CT uroscan aspect of pyelic bifidity with intravesical ureteral ectopic junction revealed by a urinary calculus and to explain the interest of CT uroscan in the management of urinary pathologies. Result: We report the observation of a 37-year-old overweight patient with a body mass index equal to 28, a history of surgery and extracorporeal litho-thipsis dating back 10 years. He was referred to the Imaging Department in the context of renal colic. The uroscanner made it possible to highlight a left pyelic bifidity associated with an ectopic abutment of the left ureter on the superolateral wall of the bladder, a calculation in the left ectopic ureteral meatus measured at 4 mm in axial diameter. He noted upstream of these lesions, a uretero-pyelo-calicielle dilation on double homolateral pyelon. On late cuts, a slight delay in left renal excretion was noted. The right kidney was also the site of a hyperdense calculation of 1257 HU density and measured 4 mm in transverse diameter with a non-obstructive appearance. Due to a lack of means, our patient was subjected to oral medication, hygiene and dietary rules and rigorous monitoring. Conclusion: At the end of this study, the uroscanner is presented as the reference examination to better explore urinary pathologies. At the same time, it makes it possible to carry out a study of the organs surrounding the urinary tract. Always think about the association of several urinary pathologies each time you see a patient for renal colic.

关键词： Bifidity Pyelic Uroscanner Ectopia Lithiasis

Study of Complications of Traditional Treatment. <br/>Member Fractures

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Surgical Science 2020年第10期11卷 289-297页

作者： Louis Traore Laye Toure Moussa sidibe Mamadou Diallo Aboul Kadri Moussa Mamadou Bassirou Traore Tiéman Coulibaly Service de Chirurgie orthopédique et traumatologique CHU Gabriel Touré Bamako Mali Service de Chirurgie orthopédique et traumatologique Hopital Regional de Sikasso Bamako Mali

Introduction: Since the times of our ancestors, traditional medicine has existed to cure all diseases [1]. The objective of this study was to assess the complications of traditional fracture treatment. Patients and Methods: This was a prospective study extending from January 01, 2018 to June 30, 2018, duration of six months. It concerned patients who had traditionally been treated beforehand for traumas with bone lesion in a traditional therapist and who had developed a complication, the definitive management of which was made in the department. Results: This study involved 102 patients, including 71 men (69.6%), with a sex ratio of 2.2. 33 patients or 32.4% were under 15 years old. The average of our patients’ age was 29.61 years with extremes of 2 and 89 years. Pupils/students (44 pupils and 5 students) were the most represented with 49 cases or 48.1% of the cases. The majority of patients (59.8% of cases) were educated or had a basic level. The majority of patients (36.3%) came as motif for a painful swelling. Gangrene was the most common complication with 37 cases or 36.3% of cases. Conclusion: At the end of our study, we have noticed that the traditional preliminary treatment of fractures was based mainly on trial and error. Practicing with inadequate means and measures without respecting the anatomical structures, is a real source of disabling handicaps. We have recorded 38, among the 102 patients who came for a complication of traditional treatment: that is 45.2% amputation, which is deplorable.

关键词： Fracture Complications Traditional Treatments

Unusual Head Trauma: About Three Observations at the Chu Pr Bocar Sidy Sall (BSS) of Kati

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Open Journal of Medical Imaging 2023年第3期13卷 57-62页

作者： Coulibaly Salia Ilias Guindo Traore Ousmane Diarra Issa Traore Youssouf Sanogo Souleymane Diarra Ouncoumba Diarra Hawa sidibe Siaka Medical Imaging Department Pr BSS University Hospital of Kati Mali Medical Imaging Department Kati University Hospital Kati Mali Department of Traumatology Neurosurgery Unit Pr BSS University Hospital of Kati Mali

Introduction: Penetrating head injuries are often due to human-to-human violence, mainly by firearms, those by stab are rare. CT is the exam of choice in the assessment of emergency lesions. We report three observations, all victims of knife assault during the brawl in order to clarify the contribution of DTM in the care. Observations: 1) Mr. I S, 21-year-old, student, was admitted with the hillside implanted in the skull. There were traces of blood on his face and clothes. There was no neurological deficit on examination. The CT scan performed showed the knife penetrating the vault of the skull at the left parietal level, up to 5 cm in the cerebral parenchyma with a minimal subdural and intracerebral hematoma;2) Mr. S C, 43-year-old, farmer, admitted with a large left fronto-temporo-parietal wound, bleeding and right hemiplegia. The CT scan performed showed a frontal linear fracture (with fronto-ethmoid hemosinus) and left temporoparietal with a parietal intraparenchymal hematoma and homolateral frontoparietal subdural hematoma;3) Mr. S B: 40 years old, driver, admitted with a parietal wound. The CT scan performed objectified a left parietal cortical hematoma in relation to a metallic foreign body (3000 HU) corresponding to the distal end of the knife penetrating the vault of the skull. They all underwent emergency surgery and received antibiotics and preventive serotherapy. The postoperative follow-up was simple, the follow-ups are without neurological sequelae. Conclusion: Head trauma by knife is rare, it results from inter-human violence. The lesion diagnosis is computed tomography. The prognosis depends on the severity.

关键词： Head Trauma Stabbing CT CHU Kati

Retroperitoneal Teratoma in Infants: About a Case in the Medical Imaging Department of the Mother and Child Hospital Center “Luxembourg”

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Open Journal of Medical Imaging 2022年第2期12卷 73-81页

作者： Issa Cisse Mamoudou Camara Chomba Abdoulaye Kone Toumin Camara Diakaridia Traore Mahamane Mariko Souleymane Sanogo Moussa Konate Siaka sidibe Medical Imaging Department CH Mother-Child “Luxembourg” Bamako Mali Medical Imaging Department CHU Point G Bamako Mali Internal Medicine Department Siguiri Prefectural Hospital Siguiri Guinea Department of Pediatric Surgery CH Mother-Child “Luxembourg” Bamako Mali

Introduction: Retroperitoneal teratoma is a rare congenital tumour, representing only 1% to 10% of primary retroperitoneal tumors in children, far behind ovarian and testicular locations. There is a clear female predominance with a sex ratio of 3.4/1. The purpose of this study is to review the clinical manifestations, the mode of revelation of retroperitoneal teratoma, the diagnostic means and the anatomopathologic aspect of retroperitoneal teratoma, then to show the contribution and the limits of the various imaging examinations: ultrasound, CT and MRI in the diagnosis of retroperitoneal teratoma. Observation: We report the case of a mature retroperitoneal teratoma discovered in a 10-month-old male infant. The diagnosis evoked by ultrasound and abdominal CT was confirmed by histological study of the excised specimen. The postoperative evolution after 3 months was favorable in particular with no signs of recurrence. Conclusion: Retroperitoneal teratoma is a rare congenital tumour. The complete imaging assessment including ultrasound and computed tomography is necessary preoperatively in order to make the diagnosis and to clearly determine the relationship with the various organs. The anatomopathological study confirms the diagnosis of retroperitoneal teratoma. Tumor excision must be radical to avoid recurrence, which readily occurs in a malignant form. Even if the tumor appears benign, postoperative monitoring based on clinical, biological and radiological examination is essential.

关键词： Tumours Mature Retroperitoneal Teratoma Child