The study focuses on estimating the input power of a power plant from available data, using the theoretical inverter efficiency as the key parameter. The paper addresses the problem of missing data in power generation...The study focuses on estimating the input power of a power plant from available data, using the theoretical inverter efficiency as the key parameter. The paper addresses the problem of missing data in power generation systems and proposes an approach based on the efficiency formula widely documented in the literature. In the absence of input data, this method makes it possible to estimate the plant’s input power using data extracted from the site, in particular that provided by the Ministry of the Environment. The importance of this study lies in the need to accurately determine the input power in order to assess the overall performance of the energy system.展开更多
In this paper, we present a study on the prediction of the power produced by the 33 MWp photovoltaic power plant at Zagtouli in Burkina-Faso, as a function of climatic factors. We identified models in the literature, ...In this paper, we present a study on the prediction of the power produced by the 33 MWp photovoltaic power plant at Zagtouli in Burkina-Faso, as a function of climatic factors. We identified models in the literature, namely the Benchmark, input/output, Marion, Cristo-fri, Kroposki, Jones-Underwood and Hatziargyriou prediction models, which depend exclusively on environmental parameters. We then compared our linear model with these seven mathematical models in order to determine the most optimal prediction model. Our results show that the Hatziargyriou model is better in terms of accuracy for power prediction.展开更多
In a context of climate change exacerbated by the increasing scarcity of fossil fuels, renewable energies, in particular photovoltaic solar energy, offer a promising alternative. Solar energy is non-polluting, globall...In a context of climate change exacerbated by the increasing scarcity of fossil fuels, renewable energies, in particular photovoltaic solar energy, offer a promising alternative. Solar energy is non-polluting, globally available and the most widely distributed resource on Earth. However, the intermittency of this energy source considerably limits its expansion. To solve this problem, storage techniques are being used, in particular, electrochemical storage using lithium-ion batteries. In this article, we will evaluate the performance of lithium-ion batteries when integrated into a photovoltaic grid. To do this, modelling and simulation of a photovoltaic system connected to a lithium-ion battery storage system will be carried out using MATLAB/Simulink software. A diagnostic of the energy consumption of the Kaya Polytechnic University Centre will be carried out, and the data will then be used in the simulator to observe the behaviour of the PV-Lion system. The results obtained indicate that lithium-ion batteries can effectively meet the centre’s energy demand. In addition, it was observed that lithium-ion batteries perform better under high energy demand than the other battery technologies studied. Successive storage systems with the same capacity but different battery technologies were compared. It was found that these storage systems can handle a maximum power of 4 × 10<sup>5</sup> W for lead-acid batteries, 6.5 × 10<sup>5</sup> W for nickel-cadmium batteries, 8.5 × 10<sup>5</sup> W for nickel-metal-hydride batteries, and more than 10 × 10<sup>5</sup> W for lithium-ion technology.展开更多
Introduction: The prevalence of urticaria is increasing. Approximately 20% of individuals have suffered from an acute episode of urticaria at least at some point in their lives. The objective of this study was to eval...Introduction: The prevalence of urticaria is increasing. Approximately 20% of individuals have suffered from an acute episode of urticaria at least at some point in their lives. The objective of this study was to evaluate the clinical and therapeutic socio-demographic profile and quality of live of patients followed for urticaria in the dermatology-venereology department of the Yalgado Ouédraogo University Hospital in Ouagadougou. Methodology: We conducted a descriptive cross-sectional study over a 5-year period from 1 January 2015 to 31 December 2019. The data were collected retrospectively by analysing the files and prospectively by evaluating the quality of life with DLQI. All the records of patients treated for urticaria at the Dermatology-Venerology Department of the Yalgado Ouédraogo University Hospital during the period were included. Results: Urticarial frequency is 1.91%. There were 36 men (25.71%) and 104 women (74.28%), i.e. a sex ratio of 0.34. The median age was 31 years with extremes of 4 to 70 years. The 30 - 45 age group accounted for 51.42%, followed by the 16 - 29 age group (31.42%), then the 46 - 65 age group (9.28%), the 4 - 15 age group (5.71%) and the over 66 age group (2.14%). In terms of occupation, pupils/students accounted for 37.1%, housewives for 18.6% and workers for 44.3%. As for the residence of the patients, 88.57% lived in Ouagadougou Personal history of atopy, it concerned 19.26% of patients, with precisely 9.28% having asthma history, 7.14% having rhino-sinusitis history, 1.42% of atopic dermatitis and allergic conjunctivitis respectively. For clinical aspects, 97.14% of the patients had superficial urticaria, and 2.86% had facial angioedema. There were 35% (49) patients with acute urticaria and 65% (91) with chronic urticaria. Chronic urticaria was spontaneous in 55% (50) and physically inducible in 10% (9) (sweating, pressure or friction). 97.14% of patients received antihistamines associated with systemic corticoids in 2.86%. For Quality of life, the mean DLQI score was 7.5展开更多
Nowadays, distributing network-connected photovoltaic (PV) systems are expanded by merging a PV system and a Direct Current (DC)/Alternating Current (AC) energy converter. DC/AC conversion of PV energy is in great dem...Nowadays, distributing network-connected photovoltaic (PV) systems are expanded by merging a PV system and a Direct Current (DC)/Alternating Current (AC) energy converter. DC/AC conversion of PV energy is in great demand for AC applications. The supply of electrical machines and transfer energy to the distribution network is a typical case. In this work, we study and design a DC/AC energy converter using harmonic selective eliminated (HSE) method. To this end, we have combined two power stages connected in derivation. Each power stage is constituted of transistors and transformers. The connection by switching of the two rectangular waves, delivered by each of the stages, makes it possible to create a quasi-sinusoidal output voltage of the inverter. Mathematical equations based on the current-voltage characteristics of the inverter have been developed. The simulation model was validated using experimental data from a 25.2 kWp grid-coupled (PV) system, connected to Gridfit type inverters. The data were exported and implemented in programming software. A good agreement was observed and this shows all the robustness and the technical performances of the energy converter device. It emerges from this analysis that the inverter output voltage and the phase angle thus simulated are very important to control in order to orientate the transfer of the power flow from the continuous cell to cell to the alternating part. Simulated and field-testing results also show that increases in the value of the modulation factor (m) for low power output are highly significant. This study is an important tool for DC/AC inverter designers during initial planning stages. A short presentation of the design model of the inverter has been proposed in this article.展开更多
This paper concerns the calculation of equilibrium composition of plasma mixture Air Fe<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>...This paper concerns the calculation of equilibrium composition of plasma mixture Air Fe<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> and CO in temperatures range 1000 K to 6000 K. We supposed that the plasma is at atmospheric pressure and at local thermodynamic equilibrium (ETL). In the Saharan zone, the aerosols are proven from desert dust and biomass fires. They are essentially composed of oxides of silicon, calcium, iron, aluminum and carbonaceous elements from biomass. Thus, air circuit breakers often operate in a polluted environment without specific protection. They can have abnormal behaviors and failures of cuts. We used Gibbs free energy minimization method to access the different numerical densities of chemical species as a function of temperature. These data are very important to calculate thermodynamic properties, transport coefficients and modeling electrical arc in circuit breakers. The results show that the dust brings many particles which have low dissociation and ionization energies. This leads to an increase in metallic elements and a strong increase in the numerical density of electrons which could have a detrimental effect during the current cut-off phase with the increase in the electrical conductivity of the plasma.展开更多
<b><span style="font-family:Verdana;">Background: </span></b></span><span><span><span style="font-family:""><span style="font-family:Ver...<b><span style="font-family:Verdana;">Background: </span></b></span><span><span><span style="font-family:""><span style="font-family:Verdana;">Serious trauma is the main cause of death for people under 40 years old. According to the WHO, in 2002, nearly 1.2 million people died worldwide from road traffic injuries. The vast majority (90%) are from low and middle-income countries. The diagnostic performance, the quality of the treatments offered, and the optimization of trauma care channels, make it possible to improve the management of serious trauma. This is not always the case in our context of a country with limited resources. </span><b><span style="font-family:Verdana;">Objectives: </span></b><span style="font-family:Verdana;">T</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">he objective is </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">o describe the epidemiological, diagnostic and therapeutic aspects of premortal death in patients with traumatic injuries. </span><b><span style="font-family:Verdana;">Methods: </span></b><span style="font-family:Verdana;">This was a descriptive study with retrospective collection in the trauma emergency department of Yalgado Ouedraogo Teaching Hospital (Ouagadougou, Burkina Faso). All patients who died on the ward while in the hospital or on arrival were included. </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">192 deaths were listed. The annual mortality was 1.6%, the sex ratio was 6.1 and the average age was 36 years. Road traffic accidents were the main etiology:</span></span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">163 deaths (85%). Head injuries were the most common injuries: 45.3% of deceased patients had a Glasgow score ≤ 8. There was no pre-hospital care in 63% of the patients展开更多
Objective: The purpose of this work was to study the factors of cancellations or postponement of regulated operating programs of the Orthopedic-Traumatology unit of Yalgado Ouédraogo University Teaching Hospital....Objective: The purpose of this work was to study the factors of cancellations or postponement of regulated operating programs of the Orthopedic-Traumatology unit of Yalgado Ouédraogo University Teaching Hospital. Materials and Methods: This was a prospective descriptive study over a period of six months. All interventions postponed or canceled during the study period were included. Patients who died or were lost to follow-up before surgery were not included. Results and Comments: the postponement/ cancellation rate was 24.5%. Out of 83 operations cancelled, 72.3% of patients were under 50 years old [extreme 15 and 88 years old]. ASA classes I and II were dominant with 57% and 37% of patients canceled, respectively. There were more postponed interventions (67.5%) than definitive cancellations (32.5%). The causes found were avoidable in 68.7% of cases. The most common was the unavailability of labile blood products (57%), the lack of financial means (36%) and the absence of the patient (28%). The results of our study show that 53% of the causes of cancellations were related to the organization of the hospital. Conclusion: the cancellation rate of orthopedic surgeries remains high at Yalgado Ouédraogo University Teaching Hospital. Most of the causes of cancellations are potentially preventable and the vast majority of them are related to the organization of the hospital. Financial accessibility to care plays an important role in cancellations.展开更多
Purpose: To evaluate the management of traumatic injuries of accident victims in the city of Ouagadougou admitted to the trauma emergencies of the University Hospital of Ouagadougou. Material and Method: This was a de...Purpose: To evaluate the management of traumatic injuries of accident victims in the city of Ouagadougou admitted to the trauma emergencies of the University Hospital of Ouagadougou. Material and Method: This was a descriptive prospective study of road traffic accident victims in the city of Ouagadougou on their arrival at trauma emergencies and on the 7th and 30th day after their discharge. A total of 991 patients were identified. The sex ratio was 1.94 with a male predominance. The average age of the patients was 31.5 years. The ratio of caregivers to patients on a 24-hour shift was 7/47, excluding patients hospitalized in the corridors. Results: We note that 81.94% of patients were transported by the fire brigade. The average time to first contact with a caregiver was 11 minutes. Upon admission, accident victims were accompanied in 84% of cases. The combination of paracetamol and néfopam was the most prescribed analgesic (50.2%). The average time between admission and X-ray completion was 101 minutes. Benign skin lesions were the most frequent (48.82%), followed by osteoarticular lesions of the limbs (fractures and dislocations). Ceftriaxone, and the combination of Amoxicillin + Clavulanic Acid, were the most prescribed antibiotics. Dressings and sutures (44.63%) were the most commonly performed treatments, followed by orthopaedic restraints (37.88%) and open fracture areas in 14.34%. The average time between admission and orthopaedic and/or surgical treatment was 04 hours 25 minutes. Patients discharged against medical advice accounted for 10.80% of cases. In 95% of cases, patients were satisfied with their management. Conclusion: The management of patients admitted to trauma emergencies is satisfactory, but difficulties remain in terms of delays in management. It is imperative to take into account certain factors involving both staff and working conditions in order to reduce the time required to provide care and improve user satisfaction in this emergency unit.展开更多
The sophistication of the implants allows the extension of the surgical indications for tibia plateau fractures. These fractures, which are often comminuted, are caused by a high velocity trauma, making treatment diff...The sophistication of the implants allows the extension of the surgical indications for tibia plateau fractures. These fractures, which are often comminuted, are caused by a high velocity trauma, making treatment difficult. Objective: The aim of this study was to determine the indications for osteosynthesis of tibia plateau fractures in the orthopaedic-traumatology department of the Yalgado Ouédraogo University Hospital, in order to evaluate the results for their better management. Patients and Methods: it was a 5-year retrospective study of the records of patients with tibia plateau fracture operated and hospitalized in our department. The anatomical-clinical and therapeutic aspects collected from the complete files were analysed. A cortico-cancellous graft was performed in 67.4% of cases. The results were evaluated according to the criteria of Merle d’Aubigné and Mazas [1]. Road traffic accidents (97.4%) were the predominant etiology, involving mainly motorcycles (97.8%). Results: Spino-tuberository and uni-tuberository fractures were the most common. The average consolidation time was 12.5 weeks. One urinary infection, 3 superficial suppurations, 3 vicious calluses and 2 equipment dismantlings were the main complications. Our results were excellent and good in 91.3% and fair in 6.5%. Osteosynthesis of tibial plateau fractures provides excellent results and remains the most appropriate procedure to treat these fractures. Conclusion: reduce the operating time, modernize the technical platform, will allow stable osteosynthesis and early functional rehabilitation to optimize their results.展开更多
The synthesis of trochanteric fractures has evolved considerably since the use of the Staca nail-plate in 1964. This implant, despite its age, remains a solid and reliable material for the synthesis of this type of fr...The synthesis of trochanteric fractures has evolved considerably since the use of the Staca nail-plate in 1964. This implant, despite its age, remains a solid and reliable material for the synthesis of this type of fracture. Objective: To evaluate the anatomo-clinical and functional results of Staca nail-plate osteosynthesis of trochanteric fractures at the Regional University Hospital of Ouahigouya in Burkina Faso. Methods: We performed a retrospective study of 52 trochanteric fractures treated by Staca nail-plate in the regional university hospital of Ouahigouya between June 2007 and June 2017. There were 10 women and 42 men with a mean age of 61 years (range 17 years to 89 years). Ten stable type I and II of Ender classification fractures and 42 unstable fractures were recorded, including four pseudarthrosis and six vicious calluses. The anterolateral approach was used in all cases. In the absence of an image intensifier, we performed an arthrotomy to identify the femoral neck and set up a guide pin. Results: The reduction was satisfactory with stable synthesis in 39 cases. At last follow-up, consolidation was effective in all patients, except one. Two cases of acetabular protrusion were noted, requiring early removal of equipment. Fifty-one patients were autonomous. The overall results were considered satisfactory. Conclusion: The Staca nail-plate remains a means of solid osteosynthesis. Although it is no longer relevant in industrialized countries, it provides comparable results to new implants for the osteosynthesis of trochanteric fractures. Because of its low cost, its abandonment is not justified in low-income countries.展开更多
There have been not many reports on the result of intralesional excision for giant cell tumors (GCTs) of the great trochanter and femoral neck because of its rarity. The authors present the case of a 35-year-old femal...There have been not many reports on the result of intralesional excision for giant cell tumors (GCTs) of the great trochanter and femoral neck because of its rarity. The authors present the case of a 35-year-old female patient managed with intralesional curettage and filling the defect with autologous bone graft from iliac crest. An appoint of three doses of Denosumab was done postoperatively. The article discusses the clinical aspects and surgical treatment, and the benefits of Denosumab. This report aimed to demonstrate the possibility to perform curetage for giant cell tumor of the hip even the recommandation for this location is wide resection and endoprothesis fixation.展开更多
The subtrochanteric fractures are relatively rare in the child and they constitute a therapeutic problem. The pseudarthrosis of this fracture in the child is often the complication of a subtrochanteric fracture treate...The subtrochanteric fractures are relatively rare in the child and they constitute a therapeutic problem. The pseudarthrosis of this fracture in the child is often the complication of a subtrochanteric fracture treated orthopedically. We report the case of a subtrochanteric pseudarthrosis in a 5 year-old child occurred following an orthopedic treatment. After surgical treatment by bloody reduction and pinning, the pseudarthrosis consolidated in 10 months with satisfactory functional results.展开更多
Bilateral anterior dislocations of the shoulder are rare lesions. They are even rarer when combined with a bilateral fracture of major tubercles. We report the case of a 28-year-old patient admitted to trauma emergenc...Bilateral anterior dislocations of the shoulder are rare lesions. They are even rarer when combined with a bilateral fracture of major tubercles. We report the case of a 28-year-old patient admitted to trauma emergencies after trauma by falling from the top of a stool. Clinical and radiographic findings revealed bilateral anterior shoulder dislocation associated with bilateral fracture of major tubercles. The patient was treated orthopedically by a reduction of dislocations under General Anesthesia, immobilization of the shoulders for 6 weeks followed by reeducation. The functional result after 12 months was satisfactory with a UCLA score of 30 points.展开更多
Background: Functional treatment of proximal femur fractures (PFF) is being discontinued with advances in surgery and anesthesia. Suspension traction is used as a waiting treatment before surgery when technical, mater...Background: Functional treatment of proximal femur fractures (PFF) is being discontinued with advances in surgery and anesthesia. Suspension traction is used as a waiting treatment before surgery when technical, material and financial conditions are not met. The surgical treatment of these fractures must ensure a stable reduction and fixation, to allow early support to the patient who will quickly regain his previous autonomy. Objective: To specify the indications for surgical treatment of proximal fractures in adult in order to evaluate the results in the context of Burkina Faso. Patients and Methods: We conducted a retrospective study including adult patients hospitalized and followed up for proximal femoral fracture (PFF) in the orthopedic-traumatology department of the Yalgado Ouedraogo University Hospital Center at Ouagadougou. Among 310 patients presenting with PFF in 5.5 years, (56 cases a year (10.4%)), we focused on those whose PFFs were treated by surgical methods and followed up. Patients treated with orthopedic (40.1%) or functional (6.8%) methods, patients with incomplete records and those having signed a discharge against medical advice were excluded. A total of 94 patients, with 95 PFFs treated by surgical methods, constituted our study population. Road traffic accidents (51.1%) and domestic accidents (48.9%) were the predominant etiologies. The functional criteria of Postel Merle d’Aubigné (PMA) were used for the evaluation of the results (Table 1). Results: A total of 65 men and 29 women (sex ratio 2.2), aged of average 56 years, were recorded. Trochanteric mass fractures were predominant with 63 cases (66.3%), including one case of bilateral fracture and one case of an open fracture;we also reported 32 femoral neck fractures (33.7%). Osteosynthesis was performed in 66 patients (70.2%) and hip arthroplasty in the remaining 28 patients (29.8%). Osteosynthesis with DHS plate screws was performed in 49 cases (73.1%) and Moore type cephalic arthroplasty in 18 cases (64.3%). Two patients (2.1%) die展开更多
Background: The management of traumatic acetabular injuries (TAI), which are often complex and diverse, is difficult and costly in the context of low-income African countries. Objective: To evaluate the treatment of t...Background: The management of traumatic acetabular injuries (TAI), which are often complex and diverse, is difficult and costly in the context of low-income African countries. Objective: To evaluate the treatment of traumatic acetabular lesions in the Orthopedics and Traumatology Department of the Yalgado Ouedraogo University Hospital, for their better management. Patients and Methods: This was a retrospective study, conducted in our department from January 2012 to December 2016. Sixty-three patients with TAI and complete records were selected. The mean age of patients with coxofemoral dislocations was 34.2 years and 36.4 years for acetabulum fractures with male predominance in both injury types. The injuries were mainly caused by a violent road traffic accident (RTA) (90.5%). Forty hip dislocations and 41 acetabular fractures were reported, with a prevalence of iliac dislocations (52.5%) and posterior wall fractures of the acetabulum (24.4%). Results: The average time to manage TAI was 15.9 hours (range 2 - 100). Medical treatment was performed in all patients. Thirty-eight coxofemoral dislocations and 34 acetabular fractures were treated by orthopedic methods. Seven complex acetabular fractures and two coxo-femoral dislocations were performed by surgical method. Two patients died (3.2%), one in a hemorrhagic shock table and the other in a septic shock table. Immediate and late complications were identified. Conclusion: Early and adequate management of our TAI, requires a modern technical platform and a sufficient number of qualified medical personnel to improve their functional outcomes.展开更多
The objective is to study the knowledge that albinos have on skin cancers, and their attitudes in terms of primary prevention and the screening practices for skin cancers in Burkina Faso. Methods: This is a cross-sect...The objective is to study the knowledge that albinos have on skin cancers, and their attitudes in terms of primary prevention and the screening practices for skin cancers in Burkina Faso. Methods: This is a cross-sectional and descriptive KAP study conducted from May 18<sup>th</sup> to July 7<sup>th</sup> 2015. It involved albinos aged at least 12 years. Their general knowledge, prevention attitudes and screening practices were considered. Results: All the responding albinos had already heard about skin cancers. Their main source of information was health workers (65.6%). They were showing at least two risk factors (99.2%) but only 68.3% affirmed having already undergone screening for skin cancer. Ignorance of the existence of screening was the main obstacle to it (16/26). The prevention means used was sun avoidance, the use of cream and protection clothing respectively in 84%, 41.5% and 51.2%. The skin lesions found were hyperpigmented macules (77.8%) then actinic keratosis (40.7%) and finally cheilitis (35.8%). We detected 4 cases of skin cancers confirmed by biopsy. Conclusion: Risk factors are frequent. Participation to screening is still insignificant. A lot is still to be done to extend the protection means. A good awareness-raising campaign and the accessibility to protection means remain for all, the best defense in the fight against skin cancers in albinos.展开更多
Pemphigus of Hallopeau (PH) is a mild and pustular form of pemphigus vegetans, termed initially as “pyodermite végétante” described by Hallopeau. We report cases in two black women. Two women aged 32 and 3...Pemphigus of Hallopeau (PH) is a mild and pustular form of pemphigus vegetans, termed initially as “pyodermite végétante” described by Hallopeau. We report cases in two black women. Two women aged 32 and 36 respectively (case 1 and case 2) were seen for a pustulosis associated with blisters and erosions. Their history and their review have found the mouth ulcerations. The clinical examination showed pustules on the cephalic end, the trunk, the limbs and the large folds. Lesions had a polycyclic aspect and spread in a centrifugal way, developing towards budding, squamous and scabby erosions quickly surrounded by new pustules. Regression left a pigmented macula. Histological examination of the skin lesion showed images similar to vulgaris pemphigus (PV), together with hyperacanthosis and papillomatosis. Aspects observed in immunofluorescence were identical to those of PV (case1). General corticoid therapy led to a rapid disappearance of lesions in Case 1 but in Case 2 the Lever protocol combining corticoid and methotrexate have been used. PH is rarely described in our regions. Clinical diagnosis is not obvious for the uninitiated. Beyond the clinical presentation, PH has the same paraclinical diagnosis and the same treatment as PV.展开更多
INTRODUCTION: The artificial depigmentation (DA) is a practice that aims to reduce the natural pigmentation of the skin by the use of depigmenting products (DP). In Burkina Faso, few studies have been made on the issu...INTRODUCTION: The artificial depigmentation (DA) is a practice that aims to reduce the natural pigmentation of the skin by the use of depigmenting products (DP). In Burkina Faso, few studies have been made on the issue and the last date of 2003. The objective of the study is to realize an overview of the DA phenomenon in women population in Bobo-Dioulasso City. METHODS: This is a descriptive cross-sectional study held from April 16th to April 30th 2016 including 437 women aged from 13 to 55 years old. A multi-stage random sampling was realized A chi-square test was used to compare groups with significant threshold of 5%. RESULTS: The prevalence of the use of DP (67.28% with IC95 = [63.52 - 71.03]). The mean age of users was 27.5 years old;the typical profile was women from 30 to 35 years old (85.7%), with elementary study level, (73.47%), housewife’s (75.19%) and monogamous (71.98%). the products used was those made of hydroquinone (81.6%), EDTA (8.33%), kojic acid (4.86%), mixtures (11.12%) or unknown products (14.58%). The origin of the product was doubtful for almost all the cases (98.96%). The monthly mean cost of this practice for a single user is 1710 CFA. Complications were reported in 62.5% of users, and the most found was dyschromia (85.87%), acne (17.39%) and burns (10.32%). DISCUSSION: The DA is in great progress in Bobo-Dioulasso (2 out of 3 women) compared to half, thirteen years ago. The hydroquinone was markedly the most frequent DP while there was an apparent lack of corticosteroids and mercuries replaced by the new depigmenting agent such as EDTA and kojic acid. This result contrasted with the classic combination hydroquinone-dermocorticoid-mercuries reported by previous studies. CONCLUSION: The low-cost of DP could explain the magnitude of the artificial depigmentation phenomenon. Other studies should be conducted in order to establish with precision the composition of these products and their causality in the occurrence of common complications. Research in cosmetology should make it possible 展开更多
文摘The study focuses on estimating the input power of a power plant from available data, using the theoretical inverter efficiency as the key parameter. The paper addresses the problem of missing data in power generation systems and proposes an approach based on the efficiency formula widely documented in the literature. In the absence of input data, this method makes it possible to estimate the plant’s input power using data extracted from the site, in particular that provided by the Ministry of the Environment. The importance of this study lies in the need to accurately determine the input power in order to assess the overall performance of the energy system.
文摘In this paper, we present a study on the prediction of the power produced by the 33 MWp photovoltaic power plant at Zagtouli in Burkina-Faso, as a function of climatic factors. We identified models in the literature, namely the Benchmark, input/output, Marion, Cristo-fri, Kroposki, Jones-Underwood and Hatziargyriou prediction models, which depend exclusively on environmental parameters. We then compared our linear model with these seven mathematical models in order to determine the most optimal prediction model. Our results show that the Hatziargyriou model is better in terms of accuracy for power prediction.
文摘In a context of climate change exacerbated by the increasing scarcity of fossil fuels, renewable energies, in particular photovoltaic solar energy, offer a promising alternative. Solar energy is non-polluting, globally available and the most widely distributed resource on Earth. However, the intermittency of this energy source considerably limits its expansion. To solve this problem, storage techniques are being used, in particular, electrochemical storage using lithium-ion batteries. In this article, we will evaluate the performance of lithium-ion batteries when integrated into a photovoltaic grid. To do this, modelling and simulation of a photovoltaic system connected to a lithium-ion battery storage system will be carried out using MATLAB/Simulink software. A diagnostic of the energy consumption of the Kaya Polytechnic University Centre will be carried out, and the data will then be used in the simulator to observe the behaviour of the PV-Lion system. The results obtained indicate that lithium-ion batteries can effectively meet the centre’s energy demand. In addition, it was observed that lithium-ion batteries perform better under high energy demand than the other battery technologies studied. Successive storage systems with the same capacity but different battery technologies were compared. It was found that these storage systems can handle a maximum power of 4 × 10<sup>5</sup> W for lead-acid batteries, 6.5 × 10<sup>5</sup> W for nickel-cadmium batteries, 8.5 × 10<sup>5</sup> W for nickel-metal-hydride batteries, and more than 10 × 10<sup>5</sup> W for lithium-ion technology.
文摘Introduction: The prevalence of urticaria is increasing. Approximately 20% of individuals have suffered from an acute episode of urticaria at least at some point in their lives. The objective of this study was to evaluate the clinical and therapeutic socio-demographic profile and quality of live of patients followed for urticaria in the dermatology-venereology department of the Yalgado Ouédraogo University Hospital in Ouagadougou. Methodology: We conducted a descriptive cross-sectional study over a 5-year period from 1 January 2015 to 31 December 2019. The data were collected retrospectively by analysing the files and prospectively by evaluating the quality of life with DLQI. All the records of patients treated for urticaria at the Dermatology-Venerology Department of the Yalgado Ouédraogo University Hospital during the period were included. Results: Urticarial frequency is 1.91%. There were 36 men (25.71%) and 104 women (74.28%), i.e. a sex ratio of 0.34. The median age was 31 years with extremes of 4 to 70 years. The 30 - 45 age group accounted for 51.42%, followed by the 16 - 29 age group (31.42%), then the 46 - 65 age group (9.28%), the 4 - 15 age group (5.71%) and the over 66 age group (2.14%). In terms of occupation, pupils/students accounted for 37.1%, housewives for 18.6% and workers for 44.3%. As for the residence of the patients, 88.57% lived in Ouagadougou Personal history of atopy, it concerned 19.26% of patients, with precisely 9.28% having asthma history, 7.14% having rhino-sinusitis history, 1.42% of atopic dermatitis and allergic conjunctivitis respectively. For clinical aspects, 97.14% of the patients had superficial urticaria, and 2.86% had facial angioedema. There were 35% (49) patients with acute urticaria and 65% (91) with chronic urticaria. Chronic urticaria was spontaneous in 55% (50) and physically inducible in 10% (9) (sweating, pressure or friction). 97.14% of patients received antihistamines associated with systemic corticoids in 2.86%. For Quality of life, the mean DLQI score was 7.5
文摘Nowadays, distributing network-connected photovoltaic (PV) systems are expanded by merging a PV system and a Direct Current (DC)/Alternating Current (AC) energy converter. DC/AC conversion of PV energy is in great demand for AC applications. The supply of electrical machines and transfer energy to the distribution network is a typical case. In this work, we study and design a DC/AC energy converter using harmonic selective eliminated (HSE) method. To this end, we have combined two power stages connected in derivation. Each power stage is constituted of transistors and transformers. The connection by switching of the two rectangular waves, delivered by each of the stages, makes it possible to create a quasi-sinusoidal output voltage of the inverter. Mathematical equations based on the current-voltage characteristics of the inverter have been developed. The simulation model was validated using experimental data from a 25.2 kWp grid-coupled (PV) system, connected to Gridfit type inverters. The data were exported and implemented in programming software. A good agreement was observed and this shows all the robustness and the technical performances of the energy converter device. It emerges from this analysis that the inverter output voltage and the phase angle thus simulated are very important to control in order to orientate the transfer of the power flow from the continuous cell to cell to the alternating part. Simulated and field-testing results also show that increases in the value of the modulation factor (m) for low power output are highly significant. This study is an important tool for DC/AC inverter designers during initial planning stages. A short presentation of the design model of the inverter has been proposed in this article.
文摘This paper concerns the calculation of equilibrium composition of plasma mixture Air Fe<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> and CO in temperatures range 1000 K to 6000 K. We supposed that the plasma is at atmospheric pressure and at local thermodynamic equilibrium (ETL). In the Saharan zone, the aerosols are proven from desert dust and biomass fires. They are essentially composed of oxides of silicon, calcium, iron, aluminum and carbonaceous elements from biomass. Thus, air circuit breakers often operate in a polluted environment without specific protection. They can have abnormal behaviors and failures of cuts. We used Gibbs free energy minimization method to access the different numerical densities of chemical species as a function of temperature. These data are very important to calculate thermodynamic properties, transport coefficients and modeling electrical arc in circuit breakers. The results show that the dust brings many particles which have low dissociation and ionization energies. This leads to an increase in metallic elements and a strong increase in the numerical density of electrons which could have a detrimental effect during the current cut-off phase with the increase in the electrical conductivity of the plasma.
文摘<b><span style="font-family:Verdana;">Background: </span></b></span><span><span><span style="font-family:""><span style="font-family:Verdana;">Serious trauma is the main cause of death for people under 40 years old. According to the WHO, in 2002, nearly 1.2 million people died worldwide from road traffic injuries. The vast majority (90%) are from low and middle-income countries. The diagnostic performance, the quality of the treatments offered, and the optimization of trauma care channels, make it possible to improve the management of serious trauma. This is not always the case in our context of a country with limited resources. </span><b><span style="font-family:Verdana;">Objectives: </span></b><span style="font-family:Verdana;">T</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">he objective is </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">o describe the epidemiological, diagnostic and therapeutic aspects of premortal death in patients with traumatic injuries. </span><b><span style="font-family:Verdana;">Methods: </span></b><span style="font-family:Verdana;">This was a descriptive study with retrospective collection in the trauma emergency department of Yalgado Ouedraogo Teaching Hospital (Ouagadougou, Burkina Faso). All patients who died on the ward while in the hospital or on arrival were included. </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">192 deaths were listed. The annual mortality was 1.6%, the sex ratio was 6.1 and the average age was 36 years. Road traffic accidents were the main etiology:</span></span></span></span><span><span><span style="font-family:""> </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">163 deaths (85%). Head injuries were the most common injuries: 45.3% of deceased patients had a Glasgow score ≤ 8. There was no pre-hospital care in 63% of the patients
文摘Objective: The purpose of this work was to study the factors of cancellations or postponement of regulated operating programs of the Orthopedic-Traumatology unit of Yalgado Ouédraogo University Teaching Hospital. Materials and Methods: This was a prospective descriptive study over a period of six months. All interventions postponed or canceled during the study period were included. Patients who died or were lost to follow-up before surgery were not included. Results and Comments: the postponement/ cancellation rate was 24.5%. Out of 83 operations cancelled, 72.3% of patients were under 50 years old [extreme 15 and 88 years old]. ASA classes I and II were dominant with 57% and 37% of patients canceled, respectively. There were more postponed interventions (67.5%) than definitive cancellations (32.5%). The causes found were avoidable in 68.7% of cases. The most common was the unavailability of labile blood products (57%), the lack of financial means (36%) and the absence of the patient (28%). The results of our study show that 53% of the causes of cancellations were related to the organization of the hospital. Conclusion: the cancellation rate of orthopedic surgeries remains high at Yalgado Ouédraogo University Teaching Hospital. Most of the causes of cancellations are potentially preventable and the vast majority of them are related to the organization of the hospital. Financial accessibility to care plays an important role in cancellations.
文摘Purpose: To evaluate the management of traumatic injuries of accident victims in the city of Ouagadougou admitted to the trauma emergencies of the University Hospital of Ouagadougou. Material and Method: This was a descriptive prospective study of road traffic accident victims in the city of Ouagadougou on their arrival at trauma emergencies and on the 7th and 30th day after their discharge. A total of 991 patients were identified. The sex ratio was 1.94 with a male predominance. The average age of the patients was 31.5 years. The ratio of caregivers to patients on a 24-hour shift was 7/47, excluding patients hospitalized in the corridors. Results: We note that 81.94% of patients were transported by the fire brigade. The average time to first contact with a caregiver was 11 minutes. Upon admission, accident victims were accompanied in 84% of cases. The combination of paracetamol and néfopam was the most prescribed analgesic (50.2%). The average time between admission and X-ray completion was 101 minutes. Benign skin lesions were the most frequent (48.82%), followed by osteoarticular lesions of the limbs (fractures and dislocations). Ceftriaxone, and the combination of Amoxicillin + Clavulanic Acid, were the most prescribed antibiotics. Dressings and sutures (44.63%) were the most commonly performed treatments, followed by orthopaedic restraints (37.88%) and open fracture areas in 14.34%. The average time between admission and orthopaedic and/or surgical treatment was 04 hours 25 minutes. Patients discharged against medical advice accounted for 10.80% of cases. In 95% of cases, patients were satisfied with their management. Conclusion: The management of patients admitted to trauma emergencies is satisfactory, but difficulties remain in terms of delays in management. It is imperative to take into account certain factors involving both staff and working conditions in order to reduce the time required to provide care and improve user satisfaction in this emergency unit.
文摘The sophistication of the implants allows the extension of the surgical indications for tibia plateau fractures. These fractures, which are often comminuted, are caused by a high velocity trauma, making treatment difficult. Objective: The aim of this study was to determine the indications for osteosynthesis of tibia plateau fractures in the orthopaedic-traumatology department of the Yalgado Ouédraogo University Hospital, in order to evaluate the results for their better management. Patients and Methods: it was a 5-year retrospective study of the records of patients with tibia plateau fracture operated and hospitalized in our department. The anatomical-clinical and therapeutic aspects collected from the complete files were analysed. A cortico-cancellous graft was performed in 67.4% of cases. The results were evaluated according to the criteria of Merle d’Aubigné and Mazas [1]. Road traffic accidents (97.4%) were the predominant etiology, involving mainly motorcycles (97.8%). Results: Spino-tuberository and uni-tuberository fractures were the most common. The average consolidation time was 12.5 weeks. One urinary infection, 3 superficial suppurations, 3 vicious calluses and 2 equipment dismantlings were the main complications. Our results were excellent and good in 91.3% and fair in 6.5%. Osteosynthesis of tibial plateau fractures provides excellent results and remains the most appropriate procedure to treat these fractures. Conclusion: reduce the operating time, modernize the technical platform, will allow stable osteosynthesis and early functional rehabilitation to optimize their results.
文摘The synthesis of trochanteric fractures has evolved considerably since the use of the Staca nail-plate in 1964. This implant, despite its age, remains a solid and reliable material for the synthesis of this type of fracture. Objective: To evaluate the anatomo-clinical and functional results of Staca nail-plate osteosynthesis of trochanteric fractures at the Regional University Hospital of Ouahigouya in Burkina Faso. Methods: We performed a retrospective study of 52 trochanteric fractures treated by Staca nail-plate in the regional university hospital of Ouahigouya between June 2007 and June 2017. There were 10 women and 42 men with a mean age of 61 years (range 17 years to 89 years). Ten stable type I and II of Ender classification fractures and 42 unstable fractures were recorded, including four pseudarthrosis and six vicious calluses. The anterolateral approach was used in all cases. In the absence of an image intensifier, we performed an arthrotomy to identify the femoral neck and set up a guide pin. Results: The reduction was satisfactory with stable synthesis in 39 cases. At last follow-up, consolidation was effective in all patients, except one. Two cases of acetabular protrusion were noted, requiring early removal of equipment. Fifty-one patients were autonomous. The overall results were considered satisfactory. Conclusion: The Staca nail-plate remains a means of solid osteosynthesis. Although it is no longer relevant in industrialized countries, it provides comparable results to new implants for the osteosynthesis of trochanteric fractures. Because of its low cost, its abandonment is not justified in low-income countries.
文摘There have been not many reports on the result of intralesional excision for giant cell tumors (GCTs) of the great trochanter and femoral neck because of its rarity. The authors present the case of a 35-year-old female patient managed with intralesional curettage and filling the defect with autologous bone graft from iliac crest. An appoint of three doses of Denosumab was done postoperatively. The article discusses the clinical aspects and surgical treatment, and the benefits of Denosumab. This report aimed to demonstrate the possibility to perform curetage for giant cell tumor of the hip even the recommandation for this location is wide resection and endoprothesis fixation.
文摘The subtrochanteric fractures are relatively rare in the child and they constitute a therapeutic problem. The pseudarthrosis of this fracture in the child is often the complication of a subtrochanteric fracture treated orthopedically. We report the case of a subtrochanteric pseudarthrosis in a 5 year-old child occurred following an orthopedic treatment. After surgical treatment by bloody reduction and pinning, the pseudarthrosis consolidated in 10 months with satisfactory functional results.
文摘Bilateral anterior dislocations of the shoulder are rare lesions. They are even rarer when combined with a bilateral fracture of major tubercles. We report the case of a 28-year-old patient admitted to trauma emergencies after trauma by falling from the top of a stool. Clinical and radiographic findings revealed bilateral anterior shoulder dislocation associated with bilateral fracture of major tubercles. The patient was treated orthopedically by a reduction of dislocations under General Anesthesia, immobilization of the shoulders for 6 weeks followed by reeducation. The functional result after 12 months was satisfactory with a UCLA score of 30 points.
文摘Background: Functional treatment of proximal femur fractures (PFF) is being discontinued with advances in surgery and anesthesia. Suspension traction is used as a waiting treatment before surgery when technical, material and financial conditions are not met. The surgical treatment of these fractures must ensure a stable reduction and fixation, to allow early support to the patient who will quickly regain his previous autonomy. Objective: To specify the indications for surgical treatment of proximal fractures in adult in order to evaluate the results in the context of Burkina Faso. Patients and Methods: We conducted a retrospective study including adult patients hospitalized and followed up for proximal femoral fracture (PFF) in the orthopedic-traumatology department of the Yalgado Ouedraogo University Hospital Center at Ouagadougou. Among 310 patients presenting with PFF in 5.5 years, (56 cases a year (10.4%)), we focused on those whose PFFs were treated by surgical methods and followed up. Patients treated with orthopedic (40.1%) or functional (6.8%) methods, patients with incomplete records and those having signed a discharge against medical advice were excluded. A total of 94 patients, with 95 PFFs treated by surgical methods, constituted our study population. Road traffic accidents (51.1%) and domestic accidents (48.9%) were the predominant etiologies. The functional criteria of Postel Merle d’Aubigné (PMA) were used for the evaluation of the results (Table 1). Results: A total of 65 men and 29 women (sex ratio 2.2), aged of average 56 years, were recorded. Trochanteric mass fractures were predominant with 63 cases (66.3%), including one case of bilateral fracture and one case of an open fracture;we also reported 32 femoral neck fractures (33.7%). Osteosynthesis was performed in 66 patients (70.2%) and hip arthroplasty in the remaining 28 patients (29.8%). Osteosynthesis with DHS plate screws was performed in 49 cases (73.1%) and Moore type cephalic arthroplasty in 18 cases (64.3%). Two patients (2.1%) die
文摘Background: The management of traumatic acetabular injuries (TAI), which are often complex and diverse, is difficult and costly in the context of low-income African countries. Objective: To evaluate the treatment of traumatic acetabular lesions in the Orthopedics and Traumatology Department of the Yalgado Ouedraogo University Hospital, for their better management. Patients and Methods: This was a retrospective study, conducted in our department from January 2012 to December 2016. Sixty-three patients with TAI and complete records were selected. The mean age of patients with coxofemoral dislocations was 34.2 years and 36.4 years for acetabulum fractures with male predominance in both injury types. The injuries were mainly caused by a violent road traffic accident (RTA) (90.5%). Forty hip dislocations and 41 acetabular fractures were reported, with a prevalence of iliac dislocations (52.5%) and posterior wall fractures of the acetabulum (24.4%). Results: The average time to manage TAI was 15.9 hours (range 2 - 100). Medical treatment was performed in all patients. Thirty-eight coxofemoral dislocations and 34 acetabular fractures were treated by orthopedic methods. Seven complex acetabular fractures and two coxo-femoral dislocations were performed by surgical method. Two patients died (3.2%), one in a hemorrhagic shock table and the other in a septic shock table. Immediate and late complications were identified. Conclusion: Early and adequate management of our TAI, requires a modern technical platform and a sufficient number of qualified medical personnel to improve their functional outcomes.
文摘The objective is to study the knowledge that albinos have on skin cancers, and their attitudes in terms of primary prevention and the screening practices for skin cancers in Burkina Faso. Methods: This is a cross-sectional and descriptive KAP study conducted from May 18<sup>th</sup> to July 7<sup>th</sup> 2015. It involved albinos aged at least 12 years. Their general knowledge, prevention attitudes and screening practices were considered. Results: All the responding albinos had already heard about skin cancers. Their main source of information was health workers (65.6%). They were showing at least two risk factors (99.2%) but only 68.3% affirmed having already undergone screening for skin cancer. Ignorance of the existence of screening was the main obstacle to it (16/26). The prevention means used was sun avoidance, the use of cream and protection clothing respectively in 84%, 41.5% and 51.2%. The skin lesions found were hyperpigmented macules (77.8%) then actinic keratosis (40.7%) and finally cheilitis (35.8%). We detected 4 cases of skin cancers confirmed by biopsy. Conclusion: Risk factors are frequent. Participation to screening is still insignificant. A lot is still to be done to extend the protection means. A good awareness-raising campaign and the accessibility to protection means remain for all, the best defense in the fight against skin cancers in albinos.
文摘Pemphigus of Hallopeau (PH) is a mild and pustular form of pemphigus vegetans, termed initially as “pyodermite végétante” described by Hallopeau. We report cases in two black women. Two women aged 32 and 36 respectively (case 1 and case 2) were seen for a pustulosis associated with blisters and erosions. Their history and their review have found the mouth ulcerations. The clinical examination showed pustules on the cephalic end, the trunk, the limbs and the large folds. Lesions had a polycyclic aspect and spread in a centrifugal way, developing towards budding, squamous and scabby erosions quickly surrounded by new pustules. Regression left a pigmented macula. Histological examination of the skin lesion showed images similar to vulgaris pemphigus (PV), together with hyperacanthosis and papillomatosis. Aspects observed in immunofluorescence were identical to those of PV (case1). General corticoid therapy led to a rapid disappearance of lesions in Case 1 but in Case 2 the Lever protocol combining corticoid and methotrexate have been used. PH is rarely described in our regions. Clinical diagnosis is not obvious for the uninitiated. Beyond the clinical presentation, PH has the same paraclinical diagnosis and the same treatment as PV.
文摘INTRODUCTION: The artificial depigmentation (DA) is a practice that aims to reduce the natural pigmentation of the skin by the use of depigmenting products (DP). In Burkina Faso, few studies have been made on the issue and the last date of 2003. The objective of the study is to realize an overview of the DA phenomenon in women population in Bobo-Dioulasso City. METHODS: This is a descriptive cross-sectional study held from April 16th to April 30th 2016 including 437 women aged from 13 to 55 years old. A multi-stage random sampling was realized A chi-square test was used to compare groups with significant threshold of 5%. RESULTS: The prevalence of the use of DP (67.28% with IC95 = [63.52 - 71.03]). The mean age of users was 27.5 years old;the typical profile was women from 30 to 35 years old (85.7%), with elementary study level, (73.47%), housewife’s (75.19%) and monogamous (71.98%). the products used was those made of hydroquinone (81.6%), EDTA (8.33%), kojic acid (4.86%), mixtures (11.12%) or unknown products (14.58%). The origin of the product was doubtful for almost all the cases (98.96%). The monthly mean cost of this practice for a single user is 1710 CFA. Complications were reported in 62.5% of users, and the most found was dyschromia (85.87%), acne (17.39%) and burns (10.32%). DISCUSSION: The DA is in great progress in Bobo-Dioulasso (2 out of 3 women) compared to half, thirteen years ago. The hydroquinone was markedly the most frequent DP while there was an apparent lack of corticosteroids and mercuries replaced by the new depigmenting agent such as EDTA and kojic acid. This result contrasted with the classic combination hydroquinone-dermocorticoid-mercuries reported by previous studies. CONCLUSION: The low-cost of DP could explain the magnitude of the artificial depigmentation phenomenon. Other studies should be conducted in order to establish with precision the composition of these products and their causality in the occurrence of common complications. Research in cosmetology should make it possible
