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International Education, Qualification and Certification Systems in Welding
L., Quintino,R., Ferraz,I., Fernandes The Korean Welding and Joining Society 2007 대한용접·접합학회지 Vol.25 No.6
The International System for Education and Qualification of Welding Personnel has been implemented based on the harmonized European System for education and qualification of welding personnel. This paper gives an overview of the International System focusing on the training guidelines and the quality assurance system developed. Systems for harmonization of Certification of Welding Personnel and for supporting companies using welding to implement ISO 3834 have been developed by EWF and are presently being transferred to IIW in line with the EWF/IIW agreement established in 2000.
High-power fiber laser cutting parameter optimization for nuclear Decommissioning
Ana Beatriz Lopez,Eurico Assunç~ao,Luisa Quintino,Jonathan Blackburn,Ali Khan 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.4
For more than 10 years, the laser process has been studied for dismantling work; however, relatively fewresearch works have addressed the effect of high-power fiber laser cutting for thick sections. Since in thenuclear sector, a significant quantity of thick material is required to be cut, this study aims to improve thereliability of laser cutting for such work and indicates guidelines to optimize the cutting procedure, inparticular, nozzle combinations (standoff distance and focus position), to minimize waste material. Theresults obtained show the performance levels that can be reached with 10 kW fiber lasers, using which itis possible to obtain narrower kerfs than those found in published results obtained with other lasers. Nonetheless, fiber lasers appear to show the same effects as those of CO2 and ND:YAG lasers. Thus, themain factor that affects the kerf width is the focal position, which means that minimum laser spot diametersare advised for smaller kerf widths.
Leandro dos Santos,Leticia de Oliveira Maciel,Erika Kristina Incerpi Gracia,Evelise Aline Soares,Danielle Aparecida Quintino Si,Valerio Garrone Barauna,Heder Frank Gianotto Estrela,Carollayne Mendonca 한국식품영양과학회 2021 Preventive Nutrition and Food Science Vol.26 No.1
Cardiovascular diseases are the leading cause of mortality and morbidity worldwide. In this study we compared the effects of oral treatment with red pepper ethereal extracts or simvastatin on dyslipidemia, left ventricle remodeling, and atherosclerotic lesions of low-density lipoprotein (LDL) receptor knockout mice (LDLr<SUP>−/−</SUP>) fed a hyperlipidic diet. Forty 3-month-old male mice were distributed into four groups: control (C; animals fed a standard diet), HL (animals fed a hyperlipidic diet), and HL+P or HL+S (animals fed a hyperlipidic diet plus red pepper ethereal extracts or simvastatin, respectively). After 60 days, treatment with both red pepper ethereal extracts and simvastatin prevented dyslipidemia, atherosclerotic lesion progression, and left ventricle hypertrophy. Our results suggest a cardioprotective effect of red pepper ethereal extracts in LDLr<SUP>−/−</SUP> mice, which is comparable to the well-known effects of simvastatin.