https://repositorio.ufu.br/handle/123456789/17890 Fri, 17 Apr 2026 04:04:10 GMT 2026-04-17T04:04:10Z https://repositorio.ufu.br/handle/123456789/47870 Title: Análise na perda de eficiência de produção de energia elétrica em usinas fotovoltaicas por efeito de sujidade Wed, 10 Dec 2025 00:00:00 GMT https://repositorio.ufu.br/handle/123456789/47870 2025-12-10T00:00:00Z https://repositorio.ufu.br/handle/123456789/47594 Title: Desenvolvimento de um sistema de levitação acústica controlado por microcontrolador Abstract: This work presents the development and validation of a didactic acoustic levitation prototype based on ultrasonic waves, aiming to provide an accessible and practical demonstration of standing wave concepts and acoustic resonance. The system was built using an Arduino Uno microcontroller, an L298N power driver, a 40 kHz ultrasonic transducer array, a 3D-printed structure, and a human-machine interface composed of a 16×2 LCD display and control buttons. The prototype allows real-time manipulation of acoustic excitation patterns, displaying on the LCD the active frame, nominal frequency, and relative amplitude index. Its low-cost, modular, and easy-to-replicate design ensures applicability in educational and laboratory environments. Experimental tests confirmed the formation of pressure zones capable of stably levitating microbeads, validating the system as a didactic tool for teaching acoustics, electronics, and applied physics. The prototype demonstrated simplicity, interactivity, and reliability, proving to be a feasible alternative for academic experiments and future improvements such as quantitative amplitude measurements and automated control of excitation patterns. Fri, 24 Oct 2025 00:00:00 GMT https://repositorio.ufu.br/handle/123456789/47594 2025-10-24T00:00:00Z https://repositorio.ufu.br/handle/123456789/47320 Title: Parametrização de erros em switches de telecomunicações Mon, 22 Sep 2025 00:00:00 GMT https://repositorio.ufu.br/handle/123456789/47320 2025-09-22T00:00:00Z https://repositorio.ufu.br/handle/123456789/47274 Title: Desenvolvimento de um sistema de automação para aquários controlado por uma aplicação WEB Abstract: This thesis proposes the development of an automation system for aquariums using Internet of Things (IoT) technology. The system is based on the ESP32 microcontroller, integrated with the MQTT communication protocol and the Node-RED platform, allowing real-time monitoring and control of essential parameters such as temperature, water level, lighting, and fish feeding. The main objective is to automate routine tasks like feeding and temperature control, while providing users with an intuitive web-based interface for remote monitoring. The project implements sensors and actuators connected to the ESP32, which send real-time data to a central server via MQTT. Node-RED is used to create automation flows and an interactive graphical interface, enabling users to visualize data and control the system remotely. Predictive analysis techniques are also applied to forecast critical conditions, ensuring system robustness in adverse situations. Tue, 23 Sep 2025 00:00:00 GMT https://repositorio.ufu.br/handle/123456789/47274 2025-09-23T00:00:00Z