Wireless Power Transfer Through Coupled Magnetic Resonance With Conventional and Superconducting Metamaterials/ Transferência de energia sem fio através de Ressonância Magnética Acoplada com Metamateriais Convencionais e Supercondutores

Wireless Power Transfer (WPT) is an option to gain mobility and convenience while charging electrical devices. Metamaterials are used to increase the energy transmission efficiency by coupled magnetic resonance. A WPT system was implemented in a 3D electromagnetic solver, where three configurations were simulated: initially without Metamaterials, with Split Ring Resonators, and with a superconductor spiral line (superconducting Metamaterials) that was designed in this work. An investigation of the power and efficiency of these systems was carried out through simulations. The distance between the coils was increased from 4 until 10 cm, and the horizontal misalignment varied up to 3 cm. The metamaterials showed themselves efficient as can be seen in the results.

Layering lines and thoughts: A study of musical time through drawing

Through the analysis of the drawing Sans Titre (Apres P. B. Notations) (2017), the following article seeks to explore the role of writing in my own artistic practice, which is concerned with the relation between music and drawing. This article examines the creative process that is carried out in relation to drawing with a musical composition, in this case Pierre Boulez’s Notations (1945), and how the imbrication of text influences and shapes the process and outcome of the artwork. In addition, this article analyses how the text engages with a wider theoretical approach of time, through ‘Chronos’ and ‘Aion’, two categories of time developed by French philosopher Gilles Deleuze primarily in The Logic of Sense ([1969] 2004), and the way they relate to drawing and opening up new ways of understanding it. Thus, the research will look at the role of the spiral line or helix as a visual model that could lend shape to musical time constituting the main frame of the drawing.

Influence of Mechanical Anisotropy on Micro-Voids and Ductile Fracture Onset and Evolution in High-Strength Low Alloyed Steels

In this paper results of a wide and innovative mechanical assessment, that was performedon large diameter spiral line pipes for gas transportation, are reported. The anisotropic materialhardening has been characterized by tensile (smooth and notched specimens), torsion, andcompression tests. Tests were performed in the pipe of the pipe with specimens machined alongseveral orientations, taking into account the pipe through thickness direction. The influence ofdifferent triaxiality stress states on anisotropic behavior of the material have also been analyzed bymeans of tensile tests on notched specimens. After the experiments, the material was assessed bymeasuring the void distribution on the material as is, and on many deformed and fracturedspecimens, including tensile tests at different triaxiality, and torsion tests. The results showed that insuch a class of materials, the experimental void fraction is fully negligible and not related to theapplied plastic strain, even at the fracture proximity. As a consequence it can be concluded that, theplastic softening hypothesis may be dropped and damage due to void evolution hypothesis is notadequate.