Examinando por Autor "Villar Ribera, Ricardo"
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Ítem Computer-Aided Design: Development of a Software Tool for Solving Loci Problems(Multidisciplinary Digital Publishing Institute (MDPI), 2022-12-21) Hernández Díaz, David; Hernández Abad, Francisco; Hernández Abad, Vicente; Villar Ribera, Ricardo; Julián, Fernando; Rojas Sola, José IgnacioIn this work, we developed a software tool for the simplified, automated definition and viewing of loci in the plane, an essential task in the design, engineering and architectural fields. The process was started by identifying the most salient geometric loci in the engineering domain (i.e., tangents). A geometric approach was followed to deal with curves from the relative positions of two circles or a circle and a point. The algorithms used can be easily implemented in commercially available CAD software, which testifies to the usefulness and timeliness of the proposed tool. The tool successfully solved all target cases and was implemented as a function with the commercial software Adobe Authorware v.7.0.2.Ítem Computer-Aided Sketching: Incorporating the Locus to Improve the Three-Dimensional Geometric Design(Multidisciplinary Digital Publishing Institute, 2020-07-16) Rojas Sola, José Ignacio; Hernández Díaz, David; Villar Ribera, Ricardo; Hernández Abad, Vicente; Hernández Abad, FranciscoThis article presents evidence of the convenience of implementing the geometric places of the plane into commercial computer-aided design (CAD) software as auxiliary tools in the computer-aided sketching process. Additionally, the research considers the possibility of adding several intuitive spatial geometric places to improve the efficiency of the three-dimensional geometric design. For demonstrative purposes, four examples are presented. A two-dimensional figure positioned on the flat face of an object shows the significant improvement over tools currently available in commercial CAD software, both vector and parametric: it is more intuitive and does not require the designer to execute as many operations. Two more complex three-dimensional examples are presented to show how the use of spatial geometric places, implemented as CAD software functions, would be an effective and highly intuitive tool. Using these functions produces auxiliary curved surfaces with points whose notable features are a significant innovation. A final example provided solves a geometric place problem using own software designed for this purpose. The proposal to incorporate geometric places into CAD software would lead to a significant improvement in the field of computational geometry. Consequently, the incorporation of geometric places into CAD software could increase technical-design productivity by eliminating some intermediate operations, such as symmetry, among others, and improving the geometry training of less skilled users.Ítem Indoor PM2.5 removal efficiency of two different non-thermal plasma systems(Academic Press LTD - Elsevier Science LTD, 2021-01-15) Hernández Díaz, David; Martos Ferreira, David; Hernández Abad, Vicente; Villar Ribera, Ricardo; Tarrés, Quim; Rojas Sola, José IgnacioThe use of non-thermal plasma (NTP) generators in air processing systems and their duct networks to improve indoor air quality (IAQ) has grown considerably in recent years. This paper reviews the advantages and disadvantages of NTP generators for IAQ improvement in biological, chemical and particulate pollutant terms. Also, it assesses and compares the ability of a multipin corona discharge (MPCD) and a dielectric barrier discharge (DBD) generator to reduce the concentration of fine particulate matter (PM2.5) in recycled, unfiltered air in a refrigeration chamber. The MPCD generator was found to have a higher PM2.5 removal efficiency; also, it was faster in removing pollutants, used less energy, and produced much less ozone. The fact that the MPCD generator performed better was seemingly the result of its increased ion production mainly. NTP generators, however, cannot match air filtration media purifiers in this respect as the latter are much more effective in removing particles. Besides, NTP-based air purifying technology continues to be subject to a major drawback, namely: the formation of ozone as a by-product. In any case, the ozone generation was uncorrelated to ion emission when using different technologies.