Melquisedec Francisco Santos

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This paper describes the current development status of a mobile robot designed to inspect the outer surface of large oil ship hulls and Floating Production Storage Offloading (FPSO) platforms. These are usually former oil tanker ships, especially adapted to work as an oil offshore platform. Several mechanisms of corrosion are present in such structures,(More)
Enhanced reproductive output after sublethal insecticide exposure, including neonicotinoid exposure, has been reported in a diversity of arthropods. Suspicions of such a phenomenon in the Neotropical brown stink bug, Euschistus heros (Hemiptera: Pentatomidae), were sparked by the increasing densities of naturally occurring populations of this insect pest(More)
This paper describes the current development status of a mobile robot designed to inspect the outer surface of large oil ship hulls and floating production storage and offloading platforms. These vessels require a detailed inspection program, using several nondestructive testing techniques. A robotic crawler designed to perform such inspections is presented(More)
This paper aims to show the development and methodology of PI controllers, tuning by Ant Colony Optimization (ACO). It is an optimized technique that uses other methods for this purpose, based on metaheuristic. Which solves the problem of the traveling salesman, among others. The PI controller has two parameters that must be determined to start the process(More)
This work presents the modeling and practical control design of an UAV (Unmanned Aerial Vehicle) based on a quadcopter type. The PID controllers were set for angular position stability (roll and pitch) and yaw speed. The PID gains were designed based on the Saturation Constraints and Performance and Root-Locus technique. The prototype was built with low(More)
Nowadays, a great variety of industrial processes has an extreme necessity of improving the quality of controlled tanks level, due to the fact that this type of control and process is widely found in the industrial environment. The objective of this work consists to create a tank system, aiming to represent in small scale an industrial level process,(More)
PI controller is still the most used control algorithm in industry. This can be explained by its robustness and easy implementation. However, the presence of overshoot (inherent characteristic of the integral action) could prejudice its use. Considering the presence of such an effect, the main objective of this paper is to present the outcome of seven(More)
For most of the seed weevils (Coleoptera: Chrysomelidae: Bruchinae), the ability to survive environmental stresses like insecticide exposure and reproduction is variable and depends on the host. Here, we evaluated the physiological costs and benefits of a host shift from kidney beans of the landrace “Vermelho” to cranberry beans of the landrace “Manteigão”(More)
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