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Performance Analysis of a Boost Converter with Components Losses

Energy and Power Engineering 2018年第9期10卷 399-413页

作者： Prince Abdoul Aziz Honadia Fabé Idrissa Barro moustapha sané Department of Physics Semiconductors and Solar Energy Laboratory Faculty of Science and Technique Cheikh Anta Diop University Dakar Senegal

A theoretical study of a conventional boost converter is presented. Based on the real behavior of the components, two models of the boost converter are introduced: one dealing only with losses through inductor and capacitor and another taking into account switching losses in addition to resistive ones. From these two models, the detailed analytical expressions of both voltage gain factor and conversion efficiency are established taking into account the losses through parasitic resistances and switching losses. The behavior of the converter is then analyzed for each model by simulation for the voltage gain factor and the conversion efficiency.

关键词： Boost Gain Factor Efficiency ESR

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Total Hip Replacement: Short- and Medium-Term Morbidity and Mortality in the Department of Orthopedic Traumatology of Donka University Hospital, Guinea-Conakry

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Open Journal of Orthopedics 2022年第12期12卷 493-502页

作者： Lamah Leopold Diallo Mamadou moustapha Sidimé Sory Diallo Ibrahima Gallé Barry Alhassane Lamah Philip Bah Mohamed Lamine Camara Nouhou Mangué Diallo Amadou Mamadou Fela sané André Department of Orthopedics and Traumatology of the Donka University Hospital Conakry Guinea Orthopedic Traumatology Department of the Ignace Deen University Hospital Conakry Guinea Orthopedic Traumatology Service of the Aristide le Dantec University Hospital in Dakar Dakar Senegal

Introduction: Total hip prostheses are a reliable means of treating hip disorders. It is indicated when pain and reduced mobility of the hip become incompatible with the patient’s daily activities. In low-income countries, the risk factors for hip disease are numerous, but the means for its management, such as total hip prostheses, are not. The aim of this work was to determine the morbi-mortality of total hip prostheses in the short and medium term in our department and to review the literature. Patients and Method: This was a prospective and descriptive study over a period of 9 years. It involved 50 THPs performed on 45 patients. Patients who had received a THP and were followed up for at least two years were included. We excluded patients who were lost to follow-up. The Moore-type posterolateral minimally invasive approach was used. Complications were investigated from the immediate postoperative period and in the medium term. The final functional results were evaluated according to the Postel Merle d’Aubigné score. Results: We performed 50 THPs out of 750 procedures, i.e. , 6.6%. The indications were: primary coxarthrosis 60%, necrosis of the femoral head 26%, post-infectious balloon hip 4%, and pseudarthrosis of the femoral neck 10%. The average time to the consultation was 2.4 years with extremes of 1 and 5 years. According to the terrain, sickle cell disease represented 18%, tuberculosis 12%. Postoperative complications were lameness 12%, dislocation 6%, suppuration 6%, death 4%, peri-prosthetic fracture 8%, loosening 2%, peri-articular ossification 2%, and paralysis of the external popliteal nerve 2%. Conclusion: Whoever performs a THP is obliged to monitor the patient as long as he/she is alive. Complications are possible at any time and can negatively change the assigned goal and force the surgeon to be expensive and sometimes inconclusive secondary interventions.

关键词： THP Morbi-Mortality Short- Medium- Term

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