Structural Steel Tensile Fracture-Inception Prevention Limit State and Ductility Criteria

This paper proposes using the tensile-fracture-inception-prevention (TFIP) limit state and ductility parameter/criterion for a safer fracture-resistant design of the tension members of steel structures. Finite element (FE) analysis revealed that the tensile band localization strain (TBLS) is significantly lower than the fracture strain currently employed as the structural steel elongation-based ductility parameter/criterion. The TBLS is thus, a safer fracture-resistant parameter/criterion than the fracture strain. FE analysis reveals that the TBLS at the center of tension specimens (mid-thickness and mid-width) is lower, and is thus a safer TFIP elongation-based ductility criteria/parameter than the TBLS at the surface of tension specimens.

Size and shape dependency of the surface energy of metallic nanoparticles: unifying the atomic and thermodynamic approaches

We identify the surface of tension for faceted, metallic nanoparticles, revealing the thermodynamically consistent size dependency of the surface energy.

Una tensión de fuerzas: Luz, energía y visión en la imagen cinematográfica

La imagen acontece como un encuentro de fuerzas que se hacen perceptibles, como sensaciones materializadas en una superficie de tensión, que podemos relacionar con la de un lago o un estanque. Este lugar fotosensible de resonancias que conducen a la visión nos permite un estudio de la imagen-visual cinematográfica desde esta condición radical de materia vibrátil de luz, en la que confluyen una multiplicidad de estratos de experiencia, y en la que todo opera al nivel de la energía: una tensión en la luz y una presencia de capas geológicas que se estructuran en un cosmos sensorial donde fluyen una serie de resonancias, relaciones y estructuras en su interior, y que la convierten en un medio de visión. Nos acercamos a esta vida de la imagen cinematográfica, como una realidad en sí misma, a partir de una serie de relaciones con la pintura, la escultura y la fotografía, así como a través de las palabras de algunos cineastas y sus reflexiones. Palabras clave: CINE; LUZ; ENERGÍA; VISIÓN; IMAGEN A tension of forces: light, energy and vision in the cinematographic image AbstractThe image occurs as a gathering of forces that are made perceptible as sensations materialized in a surface of tension, which can relate to a lake or a pond. This photosensitive place of resonances that lead to vision, allows us a study of cinematographic visual-image from this radical condition of vibrating matter of light, convergence of multiple layers of experience, and in which everything operates at the level of energy: a tension in the light and a presence of geological layers that are structured in a sensory cosmos, in which flow a series of resonances, relationships and structures, and turn it into a medium of vision. We approach this life of the film-image, as a reality in itself, from a series of relationships with painting, sculpture and photography, as well as through the words and thoughts of some filmmakers. Keywords: CINEMA; LIGHT; ENERGY; VISION; IMAGE