1,720,991 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Austenitic stainless steel with sandwich microstructure manufactured by selective laser melting
No full textThe Federation of European Materials Societies (FEMS)lAdditive manufacturing (AM), based on layer-upon-layer building, is continuously proving itself to be a groundbreaking technology, shaking metallurgists into the design of new alloys and complex microstructures. One of the main restrictions of AM is that thermomechanical or cold working processes are not commonly applied after the manufacturing process, in order to respect the part shape. This limitation forces these routes to be substituted by other hardening procedures based on pure heat treatment and to redefine the alloying strategies. The impossibility to apply cold working is specially challenging when dealing with austenitic stainless steels, because their austenite stability/metastability nature restrains the heat treatment usefulness. This work proposes the additive manufacturing of a novel high-performance austenitic stainless steel, by means of selective laser melting, with special alloying and microstructural characteristics: high nitrogen content, and composite behavior conferred by an engineered sandwich-like microstructure. Such a design strategy has the purpose to introduce intrinsic heat treatments leading to martensitic transformation during the manufacturing process, in order to achieve an enhanced mechanical response of the material. This work has been funded by the ComFuturo Third Edition Programme, supported by the Marie Sk¿odowska-Curie Actions (MSCA) COFUND of the European Commission (Grant Agreement Nº 101034263)
Microstructure and mechanical response of nanostructured bainitic steels
No full textTesis doctoral presentada en Enero de 2016 en la Universidad Carlos III de MadridNanostructured bainite is a promising new steel concept presenting excellent values of rivalling mechanical properties, strength vs. toughness or ductility. These microstructures, as opposed to conventional bainite, contain retained austenite. This, together with the fact that the structure is refined down to the nanoscale, are responsible for the good mechanical properties.
The microstructure is formed by a complete austenitization and a subsequent isothermal holding for the bainitic transformation, at temperatures about 200-350C. The microstructure consists basically of two phases: a hard matrix of bainitic ferrite and a carbon-enriched retained austenite, the second dispersed phase. The complex composite character of the microstructure determines its stress-strain response. Mechanically-induced martensitic transformation is thought to play an important role in the work-hardening behaviour, as in transformation-induced plasticity aided steels.
Whereas extensive previous research has been carried out to understand the mechanisms and microstructural parameters that control the strength of these steels, no conclusive results exist for the ductility. It is the objective of this work to determine the factors that affect the ductility, deformation and fracture. For that purpose, tensile tests have been performed on different samples, and microstructural examinations have been carried out on both undeformed and cross-sections of the tensile deformed samples.
First of all, the characterization of the microstructure and its relation with heat treatment parameters, transformation temperature and time, have been addressed. Special emphasis has been put on the crystallographic characteristics of nanostructured bainite, studied by means of electron backscatter diffraction, X-ray diffraction analysis and also transmission electron microscopy. Results show, in general, a refinement of the microstructure as the treatment temperature decreases. There is also a structural relaxation of bainitic ferrite and a favored carbon enrichment of austenite as the treatment temperature increases, which is now known to occur at the expenses of the carbon placed at defect-free solid solution in bainitic ferrite and at clusters, boundaries or dislocations. Noteworthy on their own it is the new advance on the characterization of bainitic ferrite crystal structure, which turns out to be tetragonal rather than cubic.
The full understanding of the composite behavior of nanostructured bainite requires, at a first stage, the local characterization of its mechanical properties, which are expected to change from one phase, bainitic ferrite, to another, austenite. The combined use of atomic force microscopy-based techniques, such as nanoindentation and peak force quantitative nanomechanical measurements is devoted to that purpose. Limits and advantages of these challenging techniques have been critically addressed and some elastic-plastic parameters of both phases have been measured. Peak force quantitative nanomechanical results have been compared to those obtained from the analysis of the loading force curve of single indentation and have been discussed in terms of the nature and scale of the microstructures. Results point out that, on one hand, within the elastic region, differences in mechanical properties between phases are within the error bars. On the other hand, for high treatment temperatures, plastic behavior of retained austenite and bainitic ferrite might be quite similar.
Understanding the deformation mechanisms is key to confirm the importance of the microstructure and its composite behavior in the control of ductility. They can be revealed by tracking the austenite fraction evolution and also the texture evolution of both austenite and ferrite while tensile testing. Martensitic transformation is found to contribute as a softening mechanism rather than as a strengthening one.Peer reviewe
AUSTANDING: Lean austenitic stainless steel composite microstructure with enhanced mechanical properties
No full textThird Edtion - ComFuturo Researchers (ongoing projects)
https://www.youtube.com/watch?v=pa8Ob8yhRi4&list=PL1z-B9O4vYj-3n0cmX4CAqoaqtRWZ205m&t=14sThe AUSTANDING project proposes the design and additive manufacturing of a new stainless steel with special characteristics that possesses the right combination of strength, ductility and toughness while maintaining high levels of corrosion resistance. This innovative manufacturing process, based on layer-by-layer 3D printing, enables the production of steel parts with the aforementioned high performance and complex geometries that could not be achieved until now, which will be applied to the production of next-generation heat exchangers, devices widely used and demanded by multiple industrial sectors. The nature of the processes used in the manufacture of this steel will contribute to moving towards a zero net carbon steel industry model. On the other hand, as it is a manufacturing process that seeks materials with the simplest possible chemical composition and minimises the use of scarce metals, the project fulfils the mission of the circular economy.El proyecto AUSTANDING propone el diseño y la fabricación aditiva de un nuevo acero inoxidable con características especiales que posea una combinación adecuada de resistencia, ductilidad y tenacidad y a la vez mantenga altos niveles de resistencia a la corrosión. Este innovador proceso de fabricación, basado en la impresión 3D capa a capa, permite la elaboración de piezas de acero con las altas prestaciones mencionadas y geometrías complejas que no han podido lograrse hasta ahora, lo cual se aplicará a la producción de intercambiadores de calor de próxima generación, unos dispositivos ampliamente usados y demandados por múltiples sectores industriales. La naturaleza de los procesos empleados en la fabricación de este acero contribuirá a avanzar hacia un modelo de industria siderúrgica con cero emisiones netas de carbono. Por otro lado, al ser una fabricación que busca materiales con una composición química lo más simple posible y que minimiza la utilización de metales escasos, el proyecto cumple con la misión de la economía circular
Aparición en 8 periódicos de prensa general de noticia sobre participación de empresa Acerinox en programa Comfuturo liderado por investigadora de CENIM (CSIC).
No full textENLACES A LA NOTICIA
https://www.diarioarea.com/2023/11/28/acerinox-investigacion-acero-inoxidable-de-muy-altas-prestaciones/;
https://www.europapress.es/andalucia/cadiz-00351/noticia-acerinox-europa-recibe-sede-barrios-cadiz-fundacio
n-general-csis-dentro-programa-comfuturo-20231128183506.html;
https://www.europasur.es/los_barrios/factoria-acerinox-fundacion-general-CSIC_0_1852316657.html;
https://www.noticiasde.es/andalucia-2/acerinox-europa-recibe-en-su-sede-de-los-barrios-a-la-fundacion-gener
al-csis-en-el-marco-del-programa-comfuturo/;
https://www.lavanguardia.com/local/sevilla/20231128/9413774/acerinox-europa-recibe-sede-barrios-fundaciongeneral-csis-programa-comfuturo-agenciaslv20231128.html;
https://www.elestrechodigital.com/2023/11/29/acerinox-europa-y-la-fundacion-general-csic-fortalecen-vinculos/;
https://www.acerinox.com/es/comunicacion/noticias/Acerinox-Europa-recibe-a-la-FGCSIC-el-marco-de-colabor
acion-del-programa-ComFuturo/;
https://www.8directo.com/algeciras/la-uca-cuenta-con-una-nueva-impresora-3d-para-la-fabricacion-aditiva-demetales-en-la-etsi_271736_102.html;La doctora Morales es la beneficiaria de la línea de investigación propuesta por Acerinox en la presente edición de ComFuturo. Su proyecto, Austanding, aborda el diseño y la fabricación aditiva de un nuevo acero inoxidable de muy altas prestaciones y cuyo proceso de producción contribuirá a avanzar hacia un modelo de industria siderúrgica con cero emisiones netas de carbono.
La colaboración de Acerinox y la FGCSIC en ComFuturo representa un caso de éxito de esta iniciativa que nació en 2014 con el objetivo de retener el mejor talento joven investigador en nuestro país y que ha evolucionado en sus sucesivas convocatorias hacia la presente tercera edición, enmarcada por primera vez en las Acciones Marie Skłodowska-Curie de la Comisión Europea.
ComFuturo aspira ahora a consolidar una nueva generación de investigadores globales, versátiles y multifacéticos, que aúnen la excelencia científica con capacidades de valorización de conocimiento, y que sepan combinar el liderazgo científico con la aproximación práctica a la resolución de problemas del mercado y la sociedad. En este sentido, la investigadora Lucía Morales mantendrá a lo largo de los tres años de proyecto ComFuturo, una estrecha vinculación con Acerinox, donde además realizará estancias laborales con el fin de aproximar su investigación a un entorno real industrial.Peer reviewe
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