Multiple-fault detection methodology based on vibration and current analysis applied to bearings in induction motors and gearboxes on the kinematic chain

© 2016 Juan Jose Saucedo-Dorantes et al. Gearboxes and induction motors are important components in industrial applications and their monitoring condition is critical in the industrial sector so as to reduce costs and maintenance downtimes. There are several techniques associated with the fault diagnosis in rotating machinery; however, vibration and stator currents analysis are commonly used due to their proven reliability. Indeed, vibration and current analysis provide fault condition information by means of the fault-related spectral component identification. This work presents a methodology based on vibration and current analysis for the diagnosis of wear in a gearbox and the detection of bearing defect in an induction motor both linked to the same kinematic chain; besides, the location of the fault-related components for analysis is supported by the corresponding theoretical models. The theoretical models are based on calculation of characteristic gearbox and bearings fault frequencies, in order to locate the spectral components of the faults. In this work, the influence of vibrations over the system is observed by performing motor current signal analysis to detect the presence of faults. The obtained results show the feasibility of detecting multiple faults in a kinematic chain, making the proposed methodology suitable to be used in the application of industrial machinery diagnosis.Postprint (published version

Fertilización comercial de ají chino (capsicum annuum) con Hormigaza en el corregimiento de Mamatoco municipio de Santa Marta

La presente investigación pretende observar el comportamiento del Ají Chino bajo diferentes dosis de hormigaza, al compararse con un testigo absoluto y otro comercial usando en éste último la fertilización tradicional y una mezcla, de hormigaza - fertilización química. Las variables a tener en cuenta y que se medirán son las siguientes: Producción por tratamiento, Altura de la planta al inicio de la floración, Peso seco total de la planta, Área foliar de la planta

Interstitial defects stability in FeCr alloys vs Cr concentration

Finding adequate materials to withstand the demanding conditions in the future fusion and fission reactors is a real challenge in the development of these technologies. Structural materials need to sustain high irradiation doses and temperatures that will change the microstructure over time. A better understanding of the changes produced by the irradiation will allow for a better choice of materials, ensuring a safer and reliable future power plants. High-Cr ferritic/martensitic steels head the list of structural materials due to their high resistance to swelling and corrosion. However, it is well known that these alloys present a problem of embrittlement, which could be caused by the presence of defects created by irradiation as these defects act as obstacles for dislocation motion. Therefore, the mechanical response of these materials will depend on the type of defects created during irradiation. In this work, we address a study of the effect Cr concentration has on single interstitial defect formation energies in FeCr alloys

The effect of Cr concentration on single interstitials stability in FeCr alloys

Finding adequate materials to withstand the demanding conditions in future fusion and fission reactors is a real challenge in the development of these technologies. Structural materials are going to be subjected to high irradiation doses and operating temperatures which will affect and modify material properties at a microstructural level. Understanding the changes in the microstructure induced by irradiation is needed in order to predict the response of these materials, ensuring safe and reliable future power plants. High-Cr ferritic/martensitic steels are preferred candidate structural materials due to their high resistance to radiation effects and their good resistance against corrosion. On the other hand, it is well known that these alloys present a problem of embrittlement, which could be caused by the presence of defects created by irradiation as these defects act as obstacles for dislocation motion. Therefore, the mechanical response of these materials will depend on the type of defects created during irradiation. In this work, we address a study of the effect of Cr concentration on single interstitial defect formation energies in FeCr alloys

Effect of triptolide on proliferation and apoptosis of angiotensin II-induced cardiac fibroblasts in vitro: a preliminary study

Background: The effect of triptolide (TPL) on cardiac fibroblasts (CFbs) and cardiac fibrosis remain unknown till now. This study was conducted to explore the effects of TPL on proliferation and apoptosis of angiotensin II (Ang II)-induced CFbs.Materials and Methods: Ang II was used to promote proliferation of CFbs. Two dosages of TPL (10ng/ml and 100ng/ml) were chosen. MTT assay was used to detect cell survival rate in vitro. Flow cytometer was performed to analyze apoptosis of CFbs. Hydroxyproline concentration was detected with hydroxyproline assay kit. Quantitative real-time PCR was used to detect the expression of TGF-β1 and Smad3 mRNA.Results: Ang II promoted CFbs proliferation significantly. Compared to Ang II group, TPL markedly reduced the viability of CFbs and its Hydroxyproline concentration (P<0.05). Besides, TPL can significantly promote apoptosis of CFbs (P<0.05). Furthermore, TPL reduced the expressions of TGF-β1 and Smad3 mRNA in Ang II-induced CFbs (P<0.05).Conclusion: TPL can inhibit the proliferation of CFbs in rats by down-regulating TGF-β1/Smad3 signaling pathway. TPL might be a promising therapeutic drug for myocardial fibrosis.Keywords: Cardiac fibroblast; triptolide; proliferation; apoptosis; angiotensi

Incidencias de la aplicación de las normas aduaneras y restricciones al comercio de la zona de régimen especial aduanero de Maicao, Uribía y Manaure

El comercio tradicional de mercancías extranjeras en la Zona de Régimen Especial Aduanero de Maicao, Uribia y Manaure, ha sido uno de los soportes de la economía y del desarrollo del Departamento, la frontera más importante de Colombia, cuyos habitantes han defendido la soberanía nacional, más por sus principios y convicciones patrióticos, que por los estímulos de progreso y los aportes de bienestar de parte del Estado, que en forma también tradicional las ha dejado a merced de su propia penuria. Un hecho importante: la globalización e internacionalización de la economía mundial, obligó a ciertas regiones, que venían ejerciendo la actividad comercial sin ser regulada legalmente a que se enmarcaran en una normatividad especial que le siguiera brindando la oportunidad de seguir ejerciendo su actividad comercial para así lograr su desarrollo. Con las recientes normas expedidas por el Gobierno Nacional se puede jalonar el desarrollo de la zona dando la aplicabilidad requerida, y demostrándole al país que se puede ejercer una actividad comercial enmarcada en la legalidad.El comercio tradicional de mercancías extranjeras en la Zona de Régimen Especial Aduanero de Maicao, Uribia y Manaure, ha sido uno de los soportes de la economía y del desarrollo del Departamento, la frontera más importante de Colombia, cuyos habitantes han defendido la soberanía nacional, más por sus principios y convicciones patrióticos, que por los estímulos de progreso y los aportes de bienestar de parte del Estado, que en forma también tradicional las ha dejado a merced de su propia penuria. Un hecho importante: la globalización e internacionalización de la economía mundial, obligó a ciertas regiones, que venían ejerciendo la actividad comercial sin ser regulada legalmente a que se enmarcaran en una normatividad especial que le siguiera brindando la oportunidad de seguir ejerciendo su actividad comercial para así lograr su desarrollo. Con las recientes normas expedidas por el Gobierno Nacional se puede jalonar el desarrollo de la zona dando la aplicabilidad requerida, y demostrándole al país que se puede ejercer una actividad comercial enmarcada en la legalidad

Impregnation processes of insulation rigid components of cellulose in synthetic ester and mineral oil

Although oil-immersed power transformers generally use mineral oil as insulation and cooling fluid, this liquid does not meet the new technical requirements of dielectric fluids such as high biodegradability, non-toxicity and high safety. For these reasons, natural and synthetic esters as alternative to mineral oil have increased their utilization in some transformers installations. Despite the fact that there are several works that have demonstrated the suitability of these insulation fluids from the point of view of their stability, dielectric and thermal properties, there are very few works focused on the study of the effects of these liquids on impregnation process. The aim of this work is provide information about the behavior of different rigid insulation materials, not studied until now, during the impregnation process in a synthetic ester compared with a mineral oil.This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 823969-BIOTRAF

Expression Pattern of Fatty Acid Binding Proteins in Celiac Disease Enteropathy

Celiac disease (CD) is an immune-mediated enteropathy that develops in genetically susceptible individuals following exposure to dietary gluten. Severe changes at the intestinal mucosa observed in untreated CD patients are linked to changes in the level and in the pattern of expression of different genes. Fully differentiated epithelial cells express two isoforms of fatty acid binding proteins (FABPs): intestinal and liver, IFABP and LFABP, respectively. These proteins bind and transport long chain fatty acids and also have other important biological roles in signaling pathways, particularly those related to PPARγ and inflammatory processes. Herein, we analyze the serum levels of IFABP and characterize the expression of both FABPs at protein and mRNA level in small intestinal mucosa in severe enteropathy and normal tissue. As a result, we observed higher levels of circulating IFABP in untreated CD patients compared with controls and patients on gluten-free diet. In duodenal mucosa a differential FABPs expression pattern was observed with a reduction in mRNA levels compared to controls explained by the epithelium loss in severe enteropathy. In conclusion, we report changes in FABPs' expression pattern in severe enteropathy. Consequently, there might be alterations in lipid metabolism and the inflammatory process in the small intestinal mucosa.Instituto de Investigaciones Bioquímicas de La PlataInstituto de Estudios Inmunológicos y Fisiopatológico

Expression Pattern of Fatty Acid Binding Proteins in Celiac Disease Enteropathy

Celiac disease (CD) is an immune-mediated enteropathy that develops in genetically susceptible individuals following exposure to dietary gluten. Severe changes at the intestinal mucosa observed in untreated CD patients are linked to changes in the level and in the pattern of expression of different genes. Fully differentiated epithelial cells express two isoforms of fatty acid binding proteins (FABPs): intestinal and liver, IFABP and LFABP, respectively. These proteins bind and transport long chain fatty acids and also have other important biological roles in signaling pathways, particularly those related to PPARγ and inflammatory processes. Herein, we analyze the serum levels of IFABP and characterize the expression of both FABPs at protein and mRNA level in small intestinal mucosa in severe enteropathy and normal tissue. As a result, we observed higher levels of circulating IFABP in untreated CD patients compared with controls and patients on gluten-free diet. In duodenal mucosa a differential FABPs expression pattern was observed with a reduction in mRNA levels compared to controls explained by the epithelium loss in severe enteropathy. In conclusion, we report changes in FABPs' expression pattern in severe enteropathy. Consequently, there might be alterations in lipid metabolism and the inflammatory process in the small intestinal mucosa.Instituto de Investigaciones Bioquímicas de La PlataInstituto de Estudios Inmunológicos y Fisiopatológico