Diseño y simulación de una rectenna para cosechar energía electromagnética a 2.4 GHz

Trabajo de InvestigaciónSe realizó el diseño y la simulación de una antena rectificadora con tecnología microcinta a 2.4 GHz junto con un filtro pasa-banda chebyshev de octavo orden y un rectificador de onda completa tipo puente de diodos con el fin de obtener la conversión de ondas electromagneticas a una señal DC.INTRODUCCIÓN 1. GENERALIDADES 2. RECTENNAS Y HERRMANIENTAS DE SIMULACIÓN 3. DISEÑO DE UNA ANTENA RECTIFICADORA A 2.4 GHz 4. DISEÑO Y SIMULACIÓN DE LA ANTENA RECTIFICADORA 5. CONCLUSIONES 6. RECOMENDACIONES Y TRABAJOS FUTUROS 7. ESTRATEGIAS DE COMUNICACIÓNPregradoIngeniero Electrónic

Application of Virtual Surgical Planning with Computer Assisted Design and Manufacturing Technology to Cranio-Maxillofacial Surgery

Computer aided design and manufacturing (CAD/CAM) technology today is the standard in manufacturing industry. The application of the CAD/CAM technology, together with the emerging 3D medical images based virtual surgical planning (VSP) technology, to craniomaxillofacial reconstruction has been gaining increasing attention to reconstructive surgeons. This article illustrates the components, system and clinical management of the VSP and CAD/CAM technology including: data acquisition, virtual surgical and treatment planning, individual implant design and fabrication, and outcome assessment. It focuses primarily on the technical aspects of the VSP and CAD/CAM system to improve the predictability of the planning and outcome

Historical Ethnic Homelands and Income Convergence in Africa

This paper tests the cross-sectional income convergence in historical African ethnic homelands proxied by per capita CO2 emissions between 1850 and 2005 using both parametric and non parametric tests of cross-sectional income distribution modality. We report that the cross- sectional income distribution in historical African ethnic homelands exhibits two very persistent steady states: one very low and one medium-to-high. Excluding from the analysis those areas that had no CO2 emissions throughout the sample period � although they were inhabited � we find that ethnic homeland areas still share two distinct steady states after the 1940s. Our study contributes to the literature on income convergence in ethnically divergent�areas and more specifically in the historical ethnic homelands in the African continent

Virtual surgical planning and 3D printing in prosthetic orbital reconstruction with percutaneous implants: a technical case report

Osseointegrated titanium implants to the cranial skeleton for retention of facial prostheses have proven to be a reliable replacement for adhesive systems. However, improper placement of the implants can jeopardize prosthetic outcomes, and long-term success of an implant-retained prosthesis. Three-dimensional (3D) computer imaging, virtual planning, and 3D printing have become accepted components of the preoperative planning and design phase of treatment. Computer-aided design and computer-assisted manufacture that employ cone-beam computed tomography data offer benefits to patient treatment by contributing to greater predictability and improved treatment efficiencies with more reliable outcomes in surgical and prosthetic reconstruction. 3D printing enables transfer of the virtual surgical plan to the operating room by fabrication of surgical guides. Previous studies have shown that accuracy improves considerably with guided implantation when compared to conventional template or freehand implant placement. This clinical case report demonstrates the use of a 3D technological pathway for preoperative virtual planning through prosthesis fabrication, utilizing 3D printing, for a patient with an acquired orbital defect that was restored with an implant-retained silicone orbital prosthesis

Free Microsurgical and Pedicled Flaps for Oncological Mandibular Reconstruction: Technical Aspects and Evaluation of Patient Comorbidities

Oncologic mandibular reconstruction has changed significantly over the years and continues to evolve with the introduction of newer technologies and techniques. Patient demographic, reconstructive, and complication data were obtained from a prospectively maintained clinical database of patients who underwent head and neck reconstruction at our institution. The free fibular flap is now considered the gold standard for mandibular reconstruction. However, in patients with multiple comorbidities, lengthy procedures may be less optimal and pedicled flaps, with specific modifications, can yield reasonable outcomes. Technical aspects and comorbidity profiles are examined in the oncological mandibular reconstruction cohort