Embedded diagnostic of conveyor belts actuated by induction motors

Frequently, companies with conveyor belts face problems to keep them working as expected. Currently, there are many automatic conveyor failure diagnostic techniques but most of them require complex instrumentation schemes or algorithms. This paper presents a fault diagnostic scheme for conveyor belts actuated by an induction motor. The main features of the solution include the embedded system implementation, the use of a simple and effective algorithm, and a low cost instrumentation. The system retrieves information from a current sensor located in the voltage line of the motor. A series of experiments with different states of the conveyor belt, were performed. Using this data, an algorithm based on statistical indices that detects irregular behaviors, was designed and developed. This proposal is the starting point for a future solution that detects irregularities in the conveyor belt behavior more accurately considering other variables of the system. Also, voltage, speed, and acceleration signals from the induction motor were acquired to characterize the behavior of the conveyor belt. Unfortunately, speed and acceleration signals were not accurate enough to detect any relevant change, this could be due to the low operation speed of the conveyor belt. Perhaps, in a faster conveyor this data can be helpful. Voltage analysis will be considered in future work for environments where supply voltage is not constant

Activation of the Innate Immune Response against DENV in Normal Non-Transformed Human Fibroblasts

In this work, we demonstrate that that both human whole skin and freshly isolated skin fibroblasts are productively infected with Dengue virus (DENV). In addition, primary skin fibroblast cultures were established and subsequently infected with DENV-2; we showed in these cells the presence of the viral antigen NS3, and we found productive viral infection by a conventional plaque assay. Of note, the infectivity rate was almost the same in all the primary cultures analyzed from different donors. The skin fibroblasts infected with DENV-2 underwent signaling through both TLR3 and RIG-1, but not Mda5, triggering up-regulation of IFNβ, TNFα, defensin 5 (HB5) and β defensin 2 (HβD2). In addition, DENV infected fibroblasts showed increased nuclear translocation of interferon (IFN) regulatory factor 3 (IRF3), but not interferon regulatory factor 7 IRF7, when compared with mock-infected fibroblasts. Our data suggest that fibroblasts might even participate producing mediators involved in innate immunity that activate and contribute to the orchestration of the local innate responses. This work is the first evaluating primary skin fibroblast cultures obtained from different humans, assessing both their susceptibility to DENV infection as well as their ability to produce molecules crucial for innate immunity

Atitudes infantis face aos cuidados de saúde e percepcão de dor: Papel mediador dos medos médicos

This study sought to contribute to a better understanding of children's attitudes and opinions regarding health care, mainly in terms of medical procedures, institutions and the efficacy of health professionals. The sample included 381 children, recruited from different schools in Lisbon. The more negative attitudes were attributed to institutions, while positive attitudes were related to the efficacy of health professionals. Medical procedures were considered less painful compared to potential day-to-day accidents. Higher levels of pain were reported by children of the female sex and by children during the primary education phase. Medical fears mediated the relationship between the perception of pain and children's attitudes with respect to health care. Higher levels of pain perception were seen to be related to more negative attitudes regarding health care. However, this relationship was diminished when children's fears about medical issues were contemplated. In conclusion, a translated instrument to assess children's attitudes regarding health care is needed, as it may even contribute to the development of intervention programs within the scope of the promotion of attitudes towards health care

Compilación de Proyectos de Investigacion de 1984-2002

Instituto Politecnico Nacional. UPIICS

The immunogenetic diversity of the HLA system in Mexico correlates with underlying population genetic structure

International audienc