Corrosion behavior of boride diffusion layer on CoCrMo alloy surface

87-95In the present study, the corrosion behaviour of CoCrMo ASTM F75 alloy with boride diffusion layer and under simulated physiological conditions has been investigated using electrochemical methods. Corrosion has been analyzed using Tafel and electrochemical impedance spectroscopy (EIS) curves. The corrosion resistance optimization of boride diffusion layer on ASTM F-75 alloy using a central composite design (CCD) in response surface methodology (RSM) has been studied. A boronizing thermochemical treatment has been carried out at different temperatures, time periods and paste mass. The roughness for samples subjected to boride annealing has been higher than that of the unboride sample. X-ray diffraction (XRD) measurement has shown that the boride layer of the sample at least consists of a mixture of CoB and CrB phases. The EIS and Tafel curves results have suggested that boride ASTM F75 alloy has not been a suitable candidate for orthopedics applications

Corrosion behavior of boride diffusion layer on CoCrMo alloy surface

In the present study, the corrosion behaviour of CoCrMo ASTM F75 alloy with boride diffusion layer and undersimulated physiological conditions has been investigated using electrochemical methods. Corrosion has been analyzed usingTafel and electrochemical impedance spectroscopy (EIS) curves. The corrosion resistance optimization of boride diffusionlayer on ASTM F-75 alloy using a central composite design (CCD) in response surface methodology (RSM) has beenstudied. A boronizing thermochemical treatment has been carried out at different temperatures, time periods and paste mass.The roughness for samples subjected to boride annealing has been higher than that of the unboride sample. X-ray diffraction(XRD) measurement has shown that the boride layer of the sample at least consists of a mixture of CoB and CrB phases.The EIS and Tafel curves results have suggested that boride ASTM F75 alloy has not been a suitable candidate fororthopedics applications

Crecimiento y caracterización de películas delgadas ferroelectricas de Ba1-xSrxTiO3 por la técnica de RF- Sputtering

Tesis (Maestría en Tecnología Avanzada), Instituto Politécnico Nacional, CICATA, Unidad Altamira, 2005, 1 archivo PDF, (54 páginas). tesis.ipn.m

Epidemiología de enfermedades bucales en postgrado de estomatología y cirugía oral de una universidad pública

Tesis (Odontólogo) -- Universidad de Cartagena, Facultad de Odontología 2019Dentro de esta investigación, se busca describir las patologías orales más frecuentes en la consulta externa del postgrado de estomatología y cirugía oral en la Facultad de Odontología de la Universidad de Cartagen

Elaboración de biofertilizante a base de Rhizobium spp. en campo zacatecano

Los biofertilizantes son preparados de microorganismos aplicados al suelo y/o planta con el fin de sustituir parcial o totalmente la fertilización sintética, así como disminuir la contaminación generada por los agroquímicos (Armenta, García et al. 2010). Desde un punto de vista ecológico los fijadores del nitrógeno más importantes son aquellos que fijan en asociación con una planta, porque el Nitrógeno fijado es suministrado precisamente donde se necesita: pegado a las raíces de la planta (Postgate, 1981)

A Study on the Evolutionary Adaptive Defuzzification Methods in Fuzzy Modeling *

Abstract. Evolutionary Adaptive Defuzzification Methods are a kind of defuzzification methods based on using a parametrical defuzzification expression tuned with evolutionary algorithms. Their goal is to increase the accuracy of the fuzzy system without loosing its interpretability. They induce a kind of rule cooperation in the defuzzification interface. 1 This paper deals with Evolutionary Adaptive Defuzzification Methods. We study their common general expression, the different defuzzification methods that can be obtained from it, their interpretation, and their accuracy. We consider two applications in order to analyse their accuracy in practice. We get some useful results for practical fuzzy systems designed by means of this kind of Intelligent Hybrid System

Facile Synthesis of SrCO3-Sr(OH)2/PPy Nanocomposite with Enhanced Photocatalytic Activity under Visible Light

Pyrrole monomer was chemically polymerized onto SrCO3-Sr(OH)2 powders to obtain SrCO3-Sr(OH)2/polypyrrole nanocomposite to be used as a candidate for photocatalytic degradation of methylene blue dye (MB). The material was characterized by Fourier transform infrared (FTIR) spectroscopy, UV/Vis spectroscopy, and X-ray diffraction (XRD). It was observed from transmission electronic microscopy (TEM) analysis that the reported synthesis route allows the production of SrCO3-Sr(OH)2 nanoparticles with particle size below 100 nm which were embedded within a semiconducting polypyrrole matrix (PPy). The SrCO3-Sr(OH)2 and SrCO3-Sr(OH)2/PPy nanocomposites were tested in the photodegradation of MB dye under visible light irradiation. Also, the effects of MB dye initial concentration and the catalyst load on photodegradation efficiency were studied and discussed. Under the same conditions, the efficiency of photodegradation of MB employing the SrCO3-Sr(OH)2/PPy nanocomposite increases as compared with that obtained employing the SrCO3-Sr(OH)2 nanocomposite

Nursing intervention to prevent delirium in critically ill adults

Objetivo: Determinar a eficácia de uma intervenção de enfermagem para prevenção do delirium em pacientes críticos. Método: Foi realizado um estudo quasi-experimental com grupo controle não equivalente e com avaliação antes e após a intervenção. 157 pacientes faziam parte do grupo intervenção e 134 do grupo controle. Os pacientes foram acompanhados até a alta da UTI ou óbito. A incidência de delirium em ambos os grupos foi comparada. Além disso, as medidas de efeito foram ajustadas para o escore de propensão. Resultados: A incidência e a taxa de incidência de delirium no grupo controle foram de 20,1% e 33,1 por 1000 pessoas-dia (IC 95% 22,7 a 48,3) e no grupo de intervenção foi de 0,6% e 0,64 por 1000 pessoas-dia (IC 95% 0,22 a 11,09), respectivamente. O Hazard Ratio bruto foi de 0,06 (IC 95% 0,008 a 0,45) e ajustado de 0,07 (IC 95% 0,009 a 0,60). O número que precisava ser tratado era seis. Conclusão: A baixa incidência de delirium em pacientes gravemente enfermos com intervenção demonstrou a eficácia das intervenções. O tempo médio de intervenção foi de 4 dias com dedicação de 15 minutos para cada paciente.Objetivo: Determinar la efectividad de una intervención de enfermería para la prevención del delirio en pacientes críticos. Método: Se realizó un estudio cuasiexperimental con un grupo control no equivalente y con evaluación antes y después de la intervención. 157 pacientes eran parte del grupo de intervención y 134 del grupo de control. Los pacientes fueron seguidos hasta que fueron dados de alta de la UCI o fallecieron. Se comparó la incidencia de delirio en ambos grupos. Además, las medidas del efecto se ajustaron por el puntaje de propensión. Resultados: La incidencia y la tasa de incidencia de delirio en el grupo de control fue de 20,1% y 33,1 por 1000 personas-días (IC 95% 22,7 a 48,3) y en el grupo de intervención fue de 0,6% y 0,64 por 1000 personas-días (IC 95% 0,22 a 11,09), respectivamente. El cociente de riesgo bruto fue de 0,06 (IC 95% 0,008 a 0,45) y ajustado 0,07 (IC 95% 0,009 a 0,60). El número necesario a tratar era seis. Conclusión: La baja incidencia de delirio en pacientes críticos intervenidos demostró la efectividad de las intervenciones. El tiempo medio de intervención fue de 4 días con una dedicación de 15 minutos para cada paciente.Objective: To determine the effectiveness of a nursing intervention for delirium prevention in critically ill patients. Method: A quasi-experimental study was conducted with a non-equivalent control group and with evaluation before and after the intervention. 157 Patients were part of the intervention group and 134 of the control group. Patients were followed-up until they were discharged from the ICU or died. The incidence of delirium in both groups was compared. Additionally, the effect measures were adjusted for the propensity score. Results: The incidence and incidence rate of delirium in the control group were 20.1% and 33.1 per 1000 person-days (CI 95% 22.7 to 48.3) and in the intervention group was 0.6% and 0.64 per 1000 person-days (CI 95% 0.22 to 11.09), respectively. The crude Hazard Ratio was 0.06 (CI 95% 0,008 to 0,45) and adjusted 0.07 (CI 95% 0,009 to 0,60). The number needed to be treated was six. Conclusion: Low incidence of delirium in critically ill patients intervened demonstrated the effectiveness of interventions. The average intervention time was 4 days with a 15-minutes dedication for each patient

Nursing intervention to prevent delirium in critically ill adults

ABSTRACT Objective: To determine the effectiveness of a nursing intervention for delirium prevention in critically ill patients. Method: A quasi-experimental study was conducted with a non-equivalent control group and with evaluation before and after the intervention. 157 Patients were part of the intervention group and 134 of the control group. Patients were followed-up until they were discharged from the ICU or died. The incidence of delirium in both groups was compared. Additionally, the effect measures were adjusted for the propensity score. Results: The incidence and incidence rate of delirium in the control group were 20.1% and 33.1 per 1000 person-days (CI 95% 22.7 to 48.3) and in the intervention group was 0.6% and 0.64 per 1000 person-days (CI 95% 0.22 to 11.09), respectively. The crude Hazard Ratio was 0.06 (CI 95% 0,008 to 0,45) and adjusted 0.07 (CI 95% 0,009 to 0,60). The number needed to be treated was six. Conclusion: Low incidence of delirium in critically ill patients intervened demonstrated the effectiveness of interventions. The average intervention time was 4 days with a 15-minutes dedication for each patient