O câncer de mama apresenta elevado índice de mortalidade em todo o mundo, sendo o mais incidente em mulheres. Seu diagnóstico tendo sido realizado por meio de rastreamento, ecografias mamárias e mamografias. Este trabalho tem como objetivo desenvolver um classificador para identificar o câncer de mama utilizando dados antropométricos e parâmetros de exame sanguíneo de rotina que são os biomarcadores. Redes-Neurais do tipo Perceptron Multi-Camadas(MLP) e as redes Neuro-Fuzzy (ANFIS) empregados a um comitê de decisão, trazendo como resultado uma classificação do câncer de mama, com acurácia de 97\% , um valor superior apresentado comparado aos trabalhos dos últimos anos que utilizaram biomarcadores semelhantes no período de 2013 ao início do ano de 2018.
Agricultural machinery telemetry collects and shares data, which are sent remotely and become precious information. Thus, accurate and instantaneous monitoring can provide an important base of information for adjusting the parameters of the most diverse mechanized agricultural operations, reducing input costs and maintenance expenses. In recent years, this theme has gained more strength and importance for managing rural properties. Therefore, the present study developed a bipartite bibliometric analysis in two lines of research and described the state of the art of this data collection methodology (via telemetry), presenting its technological evolution. The study presents the evolution and connection of telemetry and the processes of robotization of agricultural operations and automation provided by data collection via telemetry in real time. The main countries, keywords, researchers, institutions, and the Dickson quality index indicate a high growth in the last decade. Thus, the present study contributes to decision making regarding research topics, guidance on the state of the art, and contextualization of telemetry’s importance in current research.
Colhedoras de café trabalham com um sistema de vibração para promover a derriça dos grãos. O sistema de vibração geralmente é acoplado na extremidade de um eixo, denominado por cilindro vibrador de varetas. Este cilindro pode apresentar falhas em campo, as quais geralmente ocorrem por fratura na região da solda entre o cilindro e seu flange. Observa-se em campo que, este tipo de falha ocorre em um curto intervalo de tempo, antes de 12 meses de trabalho constante, o que requer diagnóstico de falhas. Este trabalho tem como objetivo principal realizar o diagnóstico de falha em um cilindro vibrador de varetas de uma colhedora de café. Para isso, foi realizado o mapeamento da fratura e foram confeccionados corpos de prova para a realização de ensaios mecânicos destrutivos e não destrutivos (ensaio de tração, análise química dos materiais do cilindro vibrador de varetas e flange, metalografia das juntas soldadas e ensaios de dureza Vickers e Brinell. Os resultados das análises químicas e de dureza Brinell comprovaram que o material do cilindro de varetas se trata de um aço de baixo teor de carbono. Os resultados de dureza Vickers evidenciaram a não homogeneidade do metal depositado. Os resultados obtidos nos ensaios de tração foram próximos a valores encontrados na literatura, exceto para o alongamento. Os resultados metalográficos da junta soldada evidenciaram defeitos, como trinca e porosidade, que podem influenciara fratura. Neste sentido, foi proposto um procedimento de soldagem (EPs) para a melhoria do processo de fabricação da peça analisada. Palavras-chave: Colhedora de café. Ensaio mecânicos. Diagnóstico de falhas. Experimental analysis in a stell cylinder of a coffee harvest for failure diagnosis Abstract Coffee harvesters work with vibration system in order to promote the breaking of the grains peduncle. The vibration system is usually coupled to the end of an axis, called a rod vibrating cylinder. This cylinder can present failures on duty, which usually occurs due to fracture failure in the weld region between the cylinder and its flange. It is observed that this type of failure occurs in a short time, before 12 months of constant work, which requires a failure diagnosis. The main objective of this work is to perform failure diagnosis in the vibrating rod cylinder of a coffee harvester. To this end, a the fracture mapping was performed and samples were made specimens for destructive and non-destructive mechanical tests, such as tensile testing, chemical analysis of the pipe and flange materials, metallography of the welded joints and hardness testing Vickens and Brinell. Through these tests, it was observed problems due to the welding process applied between the rod cylinder and the flange, and to manufacturing defects of the axle (arising from the casting process). As a result, it was observed a probable fatigue failure process leading to a short service life in the cylinder-flange assembly. To solve this problem, a welding procedure (EPs) is proposed to improve the fabrication process of the rod cylinder. Keywords: Coffee harvester. Mechanical tests. Failure diagnosis.
Numerical simulations have been widely used in the industry, although with some limitations. One of these limitations is the fact that the thermal effects derived from component manufacturing processes are normally disregarded in the analysis. Thus, the main goal of this study is to evaluate strains near the weld beads of a geometric model for a truck tow hook using numerical simulations by finite element method, considering thermal loads applied before the field loading. To validate the simulation results, an experiment was performed using a tow hook found in a commercial truck. Strain gauge rosettes were placed on the body base plate, and a load of 181.050 N was applied to the hook. This loading was the result of a commercial truck being pulled on level terrain, simulating a normal operation condition of the tow hook. The Von Mises stress found in simulations was approximately 302.23 MPa at the same position where the strain gauges were glued, when the load was applied. The difference between the simulated and experimental values of the equivalent specific strains in the area of the weld beads was 19.2%, and the difference between the permanent displacement values, resulting from plastic strain, in the X-direction was 0.1%. These results justify conducting new studies involving numerical simulations and considering thermal effects on static and dynamic loads in the automotive industry.
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