The Cerdà year and our fixation on origins

Peer Reviewe

Optimal design of a three-phase AFPM for in-wheel electrical traction

Sinusoidally fed permanent magnet synchronous motors (PMSM) fulfill the special features required for traction motors to be applied in electric vehicles (EV). Among them, axial flux permanent magnet (AFPM) synchronous motors are especially suited for in-wheel applications. Electric motors used in such applications must meet two main requirements, i.e. high power density and fault tolerance. This paper deals with the optimal design of an AFPM for in-wheel applications used to drive an electrical scooter. The single-objective optimization process carried out in this paper is based on designing the AFPM to obtain an optimized power density while ensuring appropriate fault tolerance requirements. For this purpose a set of analytical equations are applied to obtain the geometrical, electric and mechanical parameters of the optimized AFPM and several design restrictions are applied to ensure fault tolerance capability. The optimization process is based on a genetic algorithm and two more constrained nonlinear optimization algorithms in which the objective function is the power density. Comparisons with available data found in the technical bibliography show the appropriateness of the approach developed in this work.Postprint (published version

Ríos de ideas

Un viaje a Santiago del autor entrega una experiencia de recorrido de la ciudad y del río Mapocho, que muchas veces no somos capaces de ver y comprender. La existencia de una particular topografía y del cauce del río son determinantes de un paisaje, una trama urbana compleja y de situaciones particulares que enriquecen la ciudad.An author’s trip to Santiago offers an experience of the city’s and Mapocho River’s promenade, which we are often not able to see and understand. The existence of a particular topography and a river bed are the determinants of landscape, a complex urban scheme, and the particular situations that enrich the city

Agua y territorio

I Congreso Andaluz de Desarrollo Sostenible – V Congreso Andaluz de Ciencias Ambientale

Stereoselective Synthesis of α‐Aminophosphonic Acids through Pudovik and Kabachnik‐Fields Reaction

Representative examples concerning the Pudovik and Kabachnik‐Fields reactions as the main strategies for the stereoselective synthesis of α‐aminophosphonic acids are discussed, classifying these reactions according to the chiral auxiliary and chiral catalyst

Plasma screening effects in molecular hydrogen: modified energies and lifetimes of doubly excited states

We perform a systematic study on the behaviour of energy positions and autoionization widths of metastable resonance states in the Hydrogen molecule subject to screened Coulomb interactions among all particles using an ab initio Feshbach configuration interaction method. We only focus on the Q1 series of doubly excited states lying between the first H2 +(1sσg) and the second H2 +(2pσu) ionization thresholds, for several spectroscopic molecular symmetries 1,3Σg u, 1,3Πg, u and 1,3Δg, u. Special attention is given to the efficient and accurate method for the evaluation of screened Coulomb two-electron integrals in molecules when using configurations in terms of molecular orbitals described using a B-spline basi

Multi-objective optimal design of a five-phase fault-tolerant axial flux PM motor

Electric motors used for traction purposes in electric vehicles (EVs) must meet several requirements, including high efficiency, high power density and faulttolerance. Among them, permanent magnet synchronous motors (PMSMs) highlight. Especially, five-phase axial flux permanent magnet (AFPM) synchronous motors are particularly suitable for in-wheel applications with enhanced fault-tolerant capabilities. This paper is devoted to optimally design an AFPM for in-wheel applications. The main geometric, electric and mechanical parameters of the designed AFPM are calculated by applying an iterative method based on a set of analytical equations, which is assisted by means of a reduced number of three-dimensional finite element method (3D-FEM) simulations to limit the computational burden. To optimally design the AFPM, a constrained multi-objective optimization process based on a genetic algorithm is applied, in which two objective functions are considered, i.e. the power density and the efficiency. Several fault-tolerance constraints are settled during the optimization process to ensure enhanced fault-tolerance in the resulting motor design. The accuracy of the best solution attained is validated by means of 3D-FEM simulations.Postprint (published version

Stereoselective synthesis of α-amino-C-phosphinic acids and derivatives

α-Amino-C-phosphinic acids and derivatives are an important group of compounds of synthetic and medicinal interest and particular attention has been dedicated to their stereoselective synthesis in recent years. Among these, phosphinic pseudopeptides have acquired pharmacological importance in influencing physiologic and pathologic processes, primarily acting as inhibitors for proteolytic enzymes where molecular stereochemistry has proven to be critical. This review summarizes the latest developments in the asymmetric synthesis of acyclic and phosphacyclic α-amino-C-phosphinic acids and derivatives, following in the first case an order according to the strategy used, whereas for cyclic compounds the nitrogen embedding in the heterocyclic core is considered. In addition selected examples of pharmacological implications of title compounds are also disclosed.The authors gratefully acknowledge the CONACYT (grant 181816, 248868) and PRODEP (project UAEMOR-PTC-379) of Mexico, Ministerio de Economía y Competitividad (grant CTQ2013-40855-R) and Gobierno de Aragón-FSE (research group E40) for their financial support.We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI)

Effect of potential screening on the H2 autoionizing states

ABSTRACT: We study the behavior of autoionizing states of the hydrogen molecule subject to screened Coulomb interactions using an ab initio Feshbach configuration interaction method. Special attention is given to the algorithms developed for the evaluation of (i) screened molecular orbitals expressed in terms of one-center expansions using B-spline polynomial basis functions and (ii) screened two-electron integrals between configurations expressed in terms of such molecular orbitals, by solving the screened Poisson equation. As an illustration of the method we focus on the lowest Feshbach resonance of the Q1 1+g series of doubly excited states of H2, which lies between the first H2 + (1sσg) and the second H2 + (2pσu) ionization thresholds. We show that Coulomb screening in the electron-proton interaction and between electrons may significantly alter the resonance position and autoionizing decay as a function of internuclear distance. In general, screening increases the resonance lifetime. However, when electron-proton screening dominates over electron-electron screening, we find that the Q1 resonance acquires a pronounced shape-resonance character at internuclear distances where the resonance approaches the lower ionization threshold, thus leading to a pronounced decrease of its lifetime