Structures and Stabilities of Doubly-charged (MgO)nMg2+ (n=1-29) Cluster Ions

Ab initio perturbed ion plus polarization calculations are reported for doubly-charged nonstoichiometric (MgO)nMg2+ (n=1-29) cluster ions. We consider a large number of isomers with full relaxations of the geometries, and add the correlation correction to the Hartree-Fock energies for all cluster sizes. The polarization contribution is included at a semiempirical level also for all cluster sizes. Comparison is made with theoretical results for neutral (MgO)n clusters and singly-charged alkali-halide cluster ions. Our method is also compared to phenomenological pair potential models in order to asses their reliability for calculations on small ionic systems. The large coordination-dependent polarizabilities of oxide anions favor the formation of surface sites, and thus bulklike structures begin to dominate only after n=24. The relative stabilities of the cluster ions against evaporation of a MgO molecule show variations that are in excellent agreement with the experimental abundance spectra.Comment: Final version accepted in Journal of Chemical Physics; 8 pages plus 8 figures (6 GIFs and 2 PSs). The main difference with respect to the original submission is the inclusion of coordination-dependent polarizabilities for oxide anions. That results in substantial changes in the result

The Rothschild House business network in Spain as an example of entrepreneurial decision-taking and management structure.

In the period between 1835 and 1931 the Rothschild House established one of the most complex and influential business networks in Spanish economic history. This network controlled a wide range of activities, including financial services for the Spanish Government and the Bank of Spain, as well as the management of industrial, mining and railway firms. Instances of these firms are Rio Tinto Co., Société Minière et Metallurgique Peñarroya, MZA railway company and Deutsch & Cie, which was the main oil refining firm in Spain at the end of the 19th century.Spain 1835-1931, Rothschild, networks, Weisweiller, Bauer, foreign investments in Spain, railways, mining and refining companies, international raw material market, Public Finances, entrepreneurial function, agency problems, rent-seeking.

Micro-Jet Test Facility for Aerospace Propulsion Engineering Education

This paper describes the methodology that has been developed and implemented at the School ofAeronautics (ETSIA) of the Universidad Politecnica de Madrid (UPM) to familiarize aerospaceengineering students with the operation of real complex jet engine systems. This methodology has atwo-pronged approach: students carry out preparatory work by using, first, a gas turbineperformance prediction numerical code; then they validate their assumptions and results on anexperimental test rig. When looking at the educational aspects, we have taken care that, apart frombeing sufficiently robust and flexible, the experimental set-up is similar to real jet engine rigs, so thestudents are not constrained to exploring a much too limited parametric space. Also, because afacility like this is usually subject to extensive and somewhat rugged use, we have focused on a lowcost design

The short summer of tourismphobia. Social movements and urban conflict in the neighborhood of Poblenou, Barcelona

L’any 2017 podria ser considerat, a Barcelona, com l’any de la turismefòbia. Els canvis socials i econòmics viscuts per la ciutat durant les darreres dècades s›han vist acompanyats per l’aparició de tot un entramat de moviments socials íntimament lligats a aquestes transformacions, així com als seus impactes. Al barri del Poblenou, el diagnòstic realitzat per #EnsPlantem, Veïns en Perill d’Extinció, apunta a la turistificació com un dels seus principals reptes. Mitjançant una aproximació etnogràfica de dos anys al voltant d’aquesta plataforma, el present article pretén mostrar el paper exercit per aquest tipus de moviments davant de l’aplicació de polítiques urbanes contemporànies de tall neoliberal vinculades al turisme.The year 2017 could be considered, in Barcelona, as the year of tourismphobia. The social and economic changes experienced by the city during the last decades have been accompanied by a complex network of social movements closely linked to these transformations, as well as their impacts. In the neighborhood of Poblenou, the diagnosis made by #EnsPlantem, Neighbors in Danger of Extinction, points to the touristification as one of its main challenges. Through an ethnographic approach of two years around this platform, this article aims to show the role played by this type of movements around the application of neoliberal contemporary urban policies linked to tourism