Search results for "PAUT"
showing 10 items of 48 documents
In-process calibration of a non-destructive testing system used for in-process inspection of multi-pass welding
2020
Abstract In multi-pass welding, there is increasing motivation to move towards in-process defect detection to enable real-time repair; thus avoiding deposition of more layers over a defective weld pass. All defect detection techniques require a consistent and repeatable approach to calibration to ensure that measured defect sizing is accurate. Conventional approaches to calibration employ fixed test blocks with known defect sizes, however, this methodology can lead to incorrect sizing when considering complex geometries, materials with challenging microstructure, and the significant thermal gradients present in materials during the inter-pass inspection period. To circumvent these challenge…
Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites
2019
[EN] Films of carrageenan (KC) and glycerol (g) with different contents of chitin nanowhiskers (CHW) were prepared by a solution casting process. The molecular dynamics of pure carrageenan (KC), carrageenan/glycerol (KCg) and KCg with different quantities of CHWs as a filler was studied using dielectric relaxation spectroscopy. The analysis of the CHW effect on the molecular mobility at the glass transition, T-g, indicates that non-attractive intermolecular interactions between KCg and CHW occur. The fragility index increased upon CHW incorporation, due to a reduction in the polymer chains mobility produced by the CHW confinement of the KCg network. The apparent activation energy associated…
MOF-Mediated Synthesis of Supported Fe-Doped Pd Nanoparticles under Mild Conditions for Magnetically Recoverable Catalysis**
2020
Metal–organic framework (MOF)-driven synthesis is considered as a promising alternative for the development of new catalytic materials with well-designed active sites. This synthetic approach is used here to gradually transform a new bimetallic MOF, with Pd and Fe as the metal components, by the in situ generation of aniline under mild conditions. This methodology results in a compositionally homogeneous nanocomposite formed by Fe-doped Pd nanoparticles that, in turn, are supported on iron oxide-doped carbon. The nanocomposite has been fully characterized by several techniques such as IR and Raman spectroscopy, TEM, XPS, and XAS. The performance of this nanocomposite as an heterogeneous cat…
A Compact Representation of Preferences in Multiple Criteria Optimization Problems
2019
A critical step in multiple criteria optimization is setting the preferences for all the criteria under consideration. Several methodologies have been proposed to compute the relative priority of criteria when preference relations can be expressed either by ordinal or by cardinal information. The analytic hierarchy process introduces relative priority levels and cardinal preferences. Lexicographical orders combine both ordinal and cardinal preferences and present the additional difficulty of establishing strict priority levels. To enhance the process of setting preferences, we propose a compact representation that subsumes the most common preference schemes in a single algebraic object. We …
Investigating the effect of residual stress on hydrogen cracking in multi-pass robotic welding through process compatible non-destructive testing
2021
Abstract In this paper, the effect of Welding Residual Stress (WRS) on the size and morphology of hydrogen-induced cracks (HIC) is studied. Four samples were manufactured using a 6-axis welding robot and in two separate batches. The difference between the two batches was the clamping system used, which resulted in different amounts of welding deformation and WRS. The hydrogen cracks were intentionally manufactured in the samples using a localised water-quenching method, where water was sprayed over a specific weld pass in a predetermined position. The Phased-Array Ultrasonic Testing (PAUT) system was implemented during the welding process (high-temperature in-process method), to detect the …
Psicología familiar: relaciones familiares y desarrollo de los hijos/as
2018
La familia es la institución donde más han influido los cambios acontecidos en la esfera pública en todas sus dimensiones, desde el número de miembros que la constituyen hasta los roles y funciones de cada uno de ellos. La familia puede ser entendida como un todo organizado e interdependiente, que permite al individuo alcanzar un comportamiento autónomo en una sociedad y cultura. Podemos decir que la familia constituye el primer contexto de socialización. En ella se desarrollan los lazos afectivos, los sentimientos de pertenencia, la calidad de las interacciones entre los diferentes miembros y hasta la forma de entender las relaciones con los demás en la vida adulta. De este modo, se habrá …
Sostenibilidad en áreas metropolitanas intermedias. El caso del acceso a los servicios públicos en el área metropolitana de Valencia
2015
El análisis de la sostenibilidad en espacios complejos, como las áreas metropolitanas presenta un enorme potencial de aplicación en términos de políticas públicas. La prestación de los servicios públicos locales es uno de los aspectos más destacables y menos estudiados de la llamada sostenibilidad social, aunque es un aspecto clave de la acción política en las zonas urbanas. En la presente comunicación se propone una aproximación al tema basada en el acceso de la población a los servicios públicos esenciales (educación, salud y servicios sociales) en el Área Metropolitana de Valencia (AMV). Los Sistemas de Información Geográfica (SIG) han permitido trabajar con enormes cantidades de informa…
La cour ducale à Dijon aux XIV et XVe siècles. Préparations, installations et départs
2017
Nicolas Faucherre, Delphine Gautier, Hervé Mouillebouche; International audience
Le bureau des âmes : écritures et pratiques administratives de la Pénitencerie apostolique : (XIIIe-XIVe siècle)
2018
International audience
Assessing supply chain risks in the automotive industry through a modified MCDM-based FMECA
2020
Supply chains are complex networks that receive assiduous attention in the literature. Like any complex network, a supply chain is subject to a wide variety of risks that can result in significant economic losses and negative impacts in terms of image and prestige for companies. In circumstances of aggressive competition among companies, effective management of supply chain risks (SCRs) is crucial, and is currently a very active field of research. Failure Mode, Effects and Criticality Analysis (FMECA) has been recently extended to SCR identification and prioritization, aiming at reducing potential losses caused by lack of risk control. This article has a twofold objective. First, SCR assess…