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Materials Sciences and Applications 2024年第9期15卷 358-377页

作者： Mouhamadou Nabi Kane Mapathe Ndiaye pape moussa touré Adama Dione University College of Architecture of Dakar (CUAD) UFR SI University of Thies This Senegal Laboratory of Mechanics and Modeling UFR SI University of This This Senegal Laboratoire dEnergtique Applique (LEA) Cheikh Anta Diop University Dakar Senegal Institut of Earth Sciences (IST) Universit Cheikh Anta Diop (UCAD) Dakar Senegal

The objective of this study is to seek solutions to reduce the impact of buildings on climate change and to promote the use of local bio-sourced or geo-sourced materials for sustainable construction. Different samples of raw earth from 3 sites were taken in the commune of Mlomp. Geotechnical tests showed that the raw earth samples from sites 2 and 3 have more clay fraction while site 1 contains more sand. The fact of integrating fibers from crushed palm leaves (Borassus aethiopum) (2%, 4% and 6%) into the 3 raw earth samples reduced the mechanical resistance to compression and traction of the 3 raw earths. The experimental results of thermal tests on samples of earth mixtures with crushed Palma leaf fibers show a decrease in thermal conductivity as well as thermal effusivity as the percentages increase (2%, 4% and 6%) of fibers in raw earth for the 3 sites. This shows that this renewable composite material can help improve the thermal insulation of building envelopes.

关键词： Raw Earth Palma Leaf Fibers Ecological Composite Materials Physical Thermo-Mechanical Thermal Conductivity Thermal Effusivity

Successful Separation of Conjoined Twins at the Conakry University Hospital Center

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Open Journal of Pediatrics 2022年第3期12卷 514-521页

作者： Mamadou Alpha touré Balla Keita Balla moussa touré Naby Fofana Ibrahima Kalil Dioubaté Thiero Mamadou Aliou touré Pediatric Surgery Department Donka National Hospital Conakry Guinea Pediatric Surgery Unit General Surgery Department Ignace Deen Hospital Conakry Guinea Institute of Nutrition and Health for Children Conakry Guinea

Introduction: The birth of conjoined twins is an event extremely rare that offers unique therapeutic challenges and circumstances. We must examine each situation with the many questions that arise and which sometimes require a long reflection. We report a case of separation of pygopages conjoined twins as well as a review of the literature. Patients and Observations: a pair of conjoined twins aged 11 days, weighing 3080 g between them, was referred to the neonatology department from the Faranah prefecture, 300 km from Conakry, for care. The mother, a 30-year-old housewife, multipara, eight gestures and nine parities, had not followed any prenatal consultation. The delivery took place at home in a village with the death of the mother immediately postpartum. The clinical and paraclinical investigation had concluded with the diagnosis of Siamese type pygopage. After multidisciplinary consultation, the surgical treatment by separation of the twins was carried out at the age of 50 days with success and preservation of the physiological functions. Conclusion: The birth of conjoined twins is extremely rare. Each pair of Siamese is different and the surgical strategy must be adapted according to the shared organs. The perfect multidisciplinary work of the medical staff has been the main contributor to our success.

关键词： Siamese Twins Pygopages Multidisciplinarity Separation Conakry Hospital and University Center

Olecranon Bone Tumor Complicated by Ulnar Nerve Paresis Revealing Tuberculous Osteitis—About a Case

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Surgical Science 2023年第3期14卷 192-196页

作者： Abdoul Kadri moussa Mahamadou Diallo Kalifa Coulibaly Layes touré Mamadou Bassirou Traoré Tata touré Adegné Togo Orthopedic-Traumatology Department CHU Gabriel tourE Bamako Mali Traumatology Orthopedic Department of The Hospital and University Center: CHU Kati Mali Department of Orthopedics-Traumatology Sikasso Regional Hospital Sikasso Mali General Surgery Department CHU Gabriel tourE Bamako Mali

Introduction: The localization of bone tuberculosis at the level of the olecranon is rare and can pose a problem of differential diagnosis with a tumoral affection. Only the biopsy allows the diagnosis of certainty. The goal was to report our first case to do a review of the literature. Clinical Observation: This was a 64-year-old patient who consulted 2 years after the onset of symptoms for swelling and mechanical pain in the left elbow. On clinical examination there was a firm consistent mass measuring 6/4 cm in diameter, not very painful and hot on the posterior surface of the left elbow, accompanied by paresthesias in the territory of the ulnar nerve associated with partial functional impotence of the left forearm with little altered general condition. The X-rays of the left elbow showed extensive bone lysis of the olecranon with fracture of the base of the olecranon. The CT Scan of the elbow performed showed osteolysis of the olecranon with extensive bone reactions at the distal end of the humerus. The biopsy carried out with histological examination concluded with an aspect of tuberculous osteitis and the culture came back sterile. A curettage was performed associated with anti-tuberculosis treatment for 12 months as well as the placement of a posterior splint. The evolution at 9 months was unsatisfactory with persistence of paresis and stiffness of the elbow. Conclusion: Tuberculous osteitis of the olecranon can simulate a malignant tumor with non-specific signs of bone tuberculosis. Only the anatomopathological examination is definitive for the diagnosis. The treatment is multidisciplinary. Orthopedic evolution is difficult to predict.

关键词： Osteitis Tuberculosis Olecranon Evolution Mali

Fabrication and Characterization of PZN-4.5PT Inorganic Perovskites Nanoparticles Thin Films Deposited on P-Type Silicon Substrate

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Journal of Modern Physics 2018年第2期9卷 259-272页

作者： Rémi Ndioukane moussa touré Diouma Kobor Laurence Motte Marcel Pasquinelli Jeanne Solard Laboratoire de Chimie et de Physique des Matériaux (LCPM) Université Assane Seck de Ziguinchor Ziguinchor Sénégal Laboratory for Vascular Translational Science (LVTS) Université Paris 13 Bobigny France Institutut Matériaux Microélectronique Nanosciences de Provence (IM2NP) Aix-Marseille Université Marseille France Centrale de Proximité en Nanotechnologies de Paris Nord Institut Universitaire de Technologie de Villetaneuse Paris France

This work involves an investigation of nanostructures, microelectronic properties and domain engineering of nanoparticles thin layers of Pb(Zn1/ 3Nb2/3)O3-PbTiO3 (PZN-PT) ferroelectric single crystals deposited on nanostructured silicon substrate. In this study, devices made from PZN-4.5PT nanoparticles thin films successfully deposited on silicon substrate have been studied and discussed. SEM images show the formation of local black circles and hexagonal shapes probably due to the nucleation of a new Si-gel component or phase induced by annealing. Micro Xray Fluorescence mapping shows that the high values of Si and B atoms (≅7 and 4 normalized unit respectively) can be explained by the fact that the substrate is p-type silicon. The most interesting result of optical measurements is the very good absorption for all the thin films in UV, Visible and NIR regions with values from 70% to 90% in UV, from 75% to 93% in Visible and NIR. Tauc plots present particularities (rarely encountered behavior) with different segments or absorption changes showing the presence of multiple band gaps coming from the heterogeneity of the thin films (nanowires, gel and nanoparticles). Their values are 1.9 and 2.8 eV for DKRN-Gel, 2.1 and 3.1 eV for DKRN-UD and 2.1 and 3.2 eV for DKRN-D) corresponding respectively to the band gap of nanowires and that of the gel while the last ones correspond to the undoped and doped nanoparticles (3.1 and 3.2 eV respectively).

关键词： Nanostructures Perovskite Nanoparticles Silicon Thin Layer Band Gap

Improving the Thermal Comfort of a Building by Adding a Layer of Straw over the High Floor

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Journal of Building Construction and Planning Research 2020年第3期8卷 193-202页

作者： Gollé Diouf Oumar Diallo Harouna Mamadou Bal pape moussa toure Salif Gaye GSSSM Faculté des Sciences Université Cheikh Anta DIOP de Dakar Dakar Sénégal Laboratoire des Matériaux et d’Energétique de l’IUT Université de Thiès Thiès Sénégal LEA Ecole Supérieure Polytechnique Université Cheikh Anta DIOP de Dakar Dakar Sénégal

This document deals with the thermal characterization of a building with a layer of straw above the high floor. In the current environmental context, in Senegal, buildings are the biggest consumers of energy. This is due to the construction materials used. Almost of buildings in Senegal used concrete (cement + aggregates) as based material construction. Due to this, the buildings require air conditioning or artificial ventilation to ensure minimum comfort. In face of this situation, it becomes useful to propose methods for reducing this high energy consumption. In this work, we propose to add a layer of straw above the high floor of a building in Matam city (North Senegal). In this case, we designed and modeled one building of single room in which the walls are in briks and a concrete slab. A bale of straw is layered on this slab in order to determine its influence on the energy consumption of the building. This study shows that the straw has a strong influence on the energy consumption of a building and the slab + straw building is more energy efficient than the bare slab building.

关键词： Thermal Comfort Energy Building Straw

Dielectric and Ferroelectric Properties of PZN-4.5PT Nanoparticles Thin Films on Nanostructured Silicon Substrate for Ferrophotovoltaic and Energy Storage Application

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Journal of Modern Physics 2019年第6期10卷 613-623页

作者： Rémi Ndioukane moussa touré Diouma Kobor Laurence Motte Jeanne Solard Laurent Lebrun Laboratoire de Chimie et de Physique des Matériaux (LCPM) University Assane Seck of Ziguinchor Ziguinchor Sénégal Laboratory for Vascular Translational Science (LVTS) University Paris 13 Paris France Centrale de Proximité en Nanotechnologies de Paris Nord Paris France Laboratoire Génie Electrique et Ferroélectricité Institut National des Sciences Appliquées de Lyon Villeurbanne France

The integration of ferroelectric materials as thin films has attracted considerable attention these last years thanks to their outstanding performances that allow considering new features for the realization of photovoltaic devices. Our study focuses on investigating structural, dielectric and ferroelectric properties of undoped and Mn doped PZN-4.5PT nanoparticles thin films on Silicon substrate. We fabricate very stable PZN-4.5PT nanoparticles thin films deposited on nanostructured silicon substrate with giant relative dielectric permittivity of 2.76 × 104 and 17.7 × 104 for respectively the undoped and Mn doped thin films. These values are very large compared to those found in single crystals and might be explained by the influence of the gel in which nanoparticles were dispersed. The SEM images show the crystallization of new hexagonal phases on the film surface probably coming from interaction between Si and the gel. The hysteresis loops permitted to determine the spontaneous polarization (Ps), remnant polarization (Pr) and coercive field Ec which are equal to 11.73 μC/cm2, 10.20 μC/cm2 and 20 V/cm, respectively for the undoped nanoparticles thin film and 22.22 μC/cm2, 19.32 μC/cm2 and 20 V/cm respectively for the Mn doped one. These values are high and correspond to the best ones found in literature compared to typical ferroelectric thin films.

关键词： PZN-PT Thin Film Ferroelectric Perovskite Nanoparticles Gel

Assessing the Nutritional Status of Hemodialysis Patients in Sub-Saharan Africa: Experience of Two Hemodialysis Centers in Niger

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Open Journal of Nephrology 2016年第4期6卷 161-166页

作者： Hassan Diongole moussa Zeinabou Maiga moussa Tondi Yaya Kane Mahamane Aminou Mahamane Sani Ide Abdou Illiassou touré Aichatou Illa Adehossi Eric Omar Nephrology Department of Zender University Zender Niger Nephrology Department and Internal Medecine of Abdou Moumouni University Niamey Niger Nephrology Department of Assane Seck University Ziguinchor Senegal Hospital Center of Cahors

Introduction: Patients with end-stage chronic renal failure (ESKD) have a significant impairment in their nutritional status. Our study is aiming at evaluating the nutritional status based on clinical and biological parameters. Patient and method: This is a prospective, cross-sectional, descriptive and analytical study carried out in two departments of nephrology/dialysis in Niger from 1 December 2014 to 31 March 2015. The assessment of nutritional status relied on the Body Mass Index (BMI), albuminemia, serum phosphate, hemoglobin, CRP, urea, creatinine levels. Results: Sixty-five patients were involved in the study. The mean age was 44.35 ± 13 years with a sex ratio of 2.09 in favor of men and an average dialysis duration of 43.47 ± 36.55 months. The mean BMI was 21.60 ± 4.47 kg/m2. Undernutrition was noted in 19 patients (29.23%), hypoalbuminemia was found in 13 patients, C-reactive protein (CRP) level was high in 11 patients. In comparative analysis according to the BMI, several parameters were significantly related to undernutrition: hypo-albuminemia, hyperphosphatemia, high CRP, hyperazotemia, anorexia, MUAC, comorbidities, central venous catheter. Conclusion: The prognostic value of undernutrition in chronic hemodialysis patients fosters early recognition and management of all nutritional disturbances in these patients. Assessment and monitoring of nutritional status in chronic hemodialysis require the simultaneous determination of several markers in order to weight the limits of each of the criteria taken in isolation.

关键词： Nutrition Hemodialysis Niger

The Factors of the Failure in the Treatment of Congenital Equinus Clubfoot Varus by the Ponseti Method at the Reference Health Care Center (CSREF) of Commune III of Bamako

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Surgical Science 2023年第5期14卷 398-404页

作者： Seydou Sanogo Soumaila Diallo Boubacar Karembé Lassine Cissé Almami Kire moussa Cissé Abdoulaye Coulibaly Aboubacar touré Boureima Traoré Moustapha Yossi moussa Samaké Drissa Diarra Mohamed Traore Seydou Mariko Mariko Issa Fomba Layes touré Adégné Togo Department of Orthopedic-Traumatology CSREF CIII Bamako Mali

Clubfoot malformation is the most common serious congenital anomaly affecting the foot in children. Its treatment by the Ponseti method is simple, profitable and widely used in the world. Objective: The objective of this study was to identify the factors of the failure of its treatment by the Ponseti method. Material and Method: We carried out a retrospective and descriptive study of cases of congenital equinus clubfoot varus at the Reference Health Care Center of Commune III of Bamako over 26 months from September 2020 to November 2022. Data were treated with the utmost anonymity. Result: This study was performed on 44 children seen for clubfoot: male (68%) and female (32%), with a sex ratio of 2.1. We obtained 13 cases of recidivism including 7 boys and 6 girls. We found 21 cases of unilateral and 23 bilateral;among which 9 recurrences were found against 4 in the unilateral forms. 85% of recurrences did not have good adherence to the splint and 62% did not come regularly for follow-up consultation. We obtained 33 children with idiopathic clubfeet (75%) with a recurrence of 24%, and 7 children with secondary clubfeet with 71 % recurrence. There was no recurrence in the postural type. Among the recurrences, 38.5% started treatment between 1 and 6 months, 23.1% from 0 to 1 month and 15.4% at 2 years and more. 85% of recurrences had a Pirani score between 4.5 to 6 at the start of treatment and 15% at a score of 2.5 to 4. Conclusion: The factors of the failure of the Ponseti method are mainly non-compliance with treatment, secondary clubfeet, and a high Pirani score at the start of treatment.

关键词： Chess’ Factors Club Foot Ponseti Method Pirani Score

New Procedure to Obtain Specific and High Absorbent Silicon Nanotextures: Inverted Pyramids, Cubic Nano-Microholes, Spiroconical Nano-Microholes and Rhombohedral-Stared Nanosheet Bouquets (Nanobuckets)

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Journal of Modern Physics 2021年第9期12卷 1267-1280页

作者： Ndeye Coumba Y. Fall moussa touré Remi Ndioukane Abdoul Kadri Diallo Diouma Kobor Marcel Pasquinelli Laboratoire de Chimie et de Physique des Matériaux (LCPM) Université Assane Seck de Ziguinchor Ziguinchor Senegal Aix Marseille Université Domaine Universitaire de Saint Jér&ocirc me Marseille France

The present work relates to a process for silicon surface texturing for preparing large-area, silicon nanotextures on silicon substrates at ambient temperature by assisted chemical etching. A novel strategy comprises of two fundamental steps (metal-assisted chemical etching (MACE) and solution post-treatment) of using the silver catalyst to obtain specific nano- or micro-textures. The strategy is based on metal-induced (Ag) local oxidation and dissolution of a silicon substrate in three different concentrations of aqueous fluoride solution with the post-treatment solution. The etching technique is dependent on the etching time and concentration of aqueous fluoride solution. Therefore, detailed scanning electron microscopy observations reveal specifics shapes as inverted pyramids, cubic nano-microholes, spiroconical nano-microholes and rhombohedral-stared nanosheet bouquets (called Nanobukets), obtained for the first time on a (100) silicon surface by this new variant of the MACE method named Double Etching Method (DEM). Silicon nanostructures are used in many nanotechnology applications such as nano-microelectronics, optoelectronics or biomedical applications. UV-Visible spectrometry measurements carried out made it possible to obtain the lowest reflectance and highest absorbance values who are 3% and 97%, respectively for the rhomboedral-stared nanosheet bouquets on (100) crystalline silicon substrates in the UV-visible-NIR wavelength range from 300 to 1200 nm.

关键词： Silicon Nanotextures New Procedure Etching Reflectance Absorption

Septic Hip Arthritis at CHU Gabriel tourE: Therapeutic and Evolutionary Aspects

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Surgical Science 2023年第3期14卷 162-169页

作者： Abdoul Kadri moussa Mahamadou Diallo Layes touré Mamadou B. Traoré Tiéman Coulibaly Adegné Togo Service d’Orthopédie-Traumatologie CHU Gabriel tourE Faculté de Médecine et d’Odontostomatologie (FMOS) Bamako Mali

Introduction: Septic hip arthritis involves the functional prognosis of the hip in case of joint destruction. The aim of this work was to evaluate the hospital frequency, to determine the therapeutic and evolutionary aspects of septic arthritis of the hip at the trauma orthopedic department of CHU Gabriel tourE Bamako. Methods: This was a descriptive, monocentric, cross-sectional study of patients with septic hip arthritis, managed from January 2010 to December 2019. Results: We collected 48 patients. Gender male was represented 58.3% with a sex ratio of 1.4. The average age of our patients was 17.02, with extremes of 7 and 80. Septic hip arthritis was observed in a chronic mode in 87.5% (more than 3 weeks). Diagnosis was based on clinical, bacteriological and imaging. Trauma was incriminated in 5 cases (10.4%). The radiographic assessment at the time of the consultation was normal in 66.7% of cases. Staphylococcus aureus was the most common germ with 47.9%, and the culture was sterile in 10.4%. Septic hip arthritis was complicated in 18.75% of cases. Antibiotic therapy was probabilistic with the combination of ciprofloxacin and metronidazole in 24 cases (50%). Watson Jones antero-lateral arthrotomy was performed in 35.71%. We observed 66.6% complications. After an average decrease of 41.6 months, functional results were good in 58.3%. Conclusion: Septic hip arthritis is a serious condition of the child and adolescent. Diagnosis must be early;management must also be early, multidisciplinary and adapted to minimize sequelae.

关键词： Hip Arthritis Septic Treatment Evolution Mali