A Note on Unparticle Decays

The coupling of an unparticle operator O_U to Standard Model particles opens up the possibility of unparticle decays into standard model fields. We study this issue by analyzing the pole structure (and spectral function) of the unparticle propagator, corrected to account for one-loop polarization effects from virtual SM particles. We find that the propagator of a scalar unparticle (of scaling dimension 1 < d_U < 2) with a mass gap m_g develops an isolated pole, m_p^2-i m_p Gamma_p, with m_p^2 < m_g^2 below the unparticle continuum that extends above m_g (showing that the theory would be unstable without a mass gap). If that pole lies below the threshold for decay into two standard model particles the pole corresponds to a stable unparticle state (and its width Gamma_p is zero). For m_p^2 above threshold the width is non zero and related to the unparticle decay rate into Standard Model particles. This picture is valid for any value of d_U in the considered range.Comment: 11 pages, 4 figure

Improvement of the Proton Conduction of Copper(II)-Mesoxalate Metal−Organic Frameworks by Strategic Selection of the Counterions

Supporting Information The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.inorgchem.2c01241.ACKNOWLEDGMENTS The authors would like to dedicate this publication to the memory of our good friend, scientific collaborator and former Inorganic Chemistry Department Professor Dr. Pedro Gili- Trujillo, whose wisdom, scientific knowledge, serenity, and kindness we will never forget. B.G.-H. acknowledges the SIDIX/SEGAI facility of the University of La Laguna.Threecopper(II)/mesoxalatebasedMOFswithformulas(H3O)[Cu9(Hmesox)6(H2O)6Cl]•8H2O(1),(NH2Me2)0.4(H3O)0.6[Cu9(Hmesox)6(H2O)6Cl]•8H2O(2),and(enH2)0.25(enH)1.5[Cu6(Hmesox)3(mesox)(H2O)6Cl0.5]Cl0.5•5.25H2O (3) were synthesized (H4mesox = mesoxalic acid = 2,2-dihydroxypropanedioic acid, en = ethylenediamine). Essentially, all of the compounds display the same anionic network with a different arrangement of the cations, which have a remarkable effect on the proton conduction of the materials, ranging from 1.16 × 10–4 S cm–1 for 1 to 1.87 × 10–3 S cm–1 for 3 (at 80 °C and 95% RH). These compounds also display antiferromagnetic coupling among the copper(II) ions through both the carboxylate and alkoxido bridges. The values of the principal magnetic coupling constants were calculated by density functional theory (DFT), leading to congruent values that confirm the predominant antiferromagnetic nature of the interactions

Profitability of technical trading rules in the Brazilian stock market

Objetivo: El objetivo de este trabajo ha sido analizar las diferentes estrategias comerciales para el mercado de valores brasileño. Este análisis se centra en la comparación y combinación de diferentes reglas activas contra la regla pasiva de compra y retención. Antecedentes: El papel de líder regional del mercado de valores brasileño ha atraído la atención de los inversores, que ahora lo consideran una alternativa válida cuando buscan diversificar sus carteras. Por consiguiente, un uso adecuado de las Reglas Técnicas de Comercio (RTC) podría ayudar a los inversores a obtener los beneficios deseados de sus inversiones. Método: Se compara el rendimiento de las estrategias activas basadas en las TTR clásicas con una propuesta basada en el indicador de momentum, y luego todas ellas con las obtenidas de la estrategia pasiva de compra y retención. Se emplean pruebas de comprobación de la realidad y de capacidad de predicción superior para tener en cuenta el posible sesgo de fisgoneo de los datos. Los resultados: Se muestra que las reglas clásicas tienen un peor rendimiento que una regla propuesta basada en la Tasa de Cambio. Además, cuando empleamos una ETF que rastrea las compañías más pequeñas, obtenemos rendimientos más altos que los obtenidos para las compañías más grandes. Contribuciones: Este análisis es especialmente interesante porque, hasta donde sabemos, no hay evidencia empírica en ese sentido para el mercado de valores brasileño. Además, ampliamos la evidencia anterior centrándonos en tres ETF que rastrean las empresas grandes, medianas y pequeñas del mercado de valores brasileño y, por lo tanto, los resultados obtenidos de nuestro análisis proporcionarán una mejor visión de las oportunidades de inversión que la evidencia empírica anterior ha mostrado.Objective: The objective of this paper has been to analyze different trading strategies for the Brazilian stock market. This analysis is focused on the comparison and combination of different active rules against the passive rule of buy-and-hold. Background: The role of regional leader of the Brazilian stock market has attracted the attention of the investors, who now consider it a valid alternative when seeking to diversify their portfolios. Consequently, an adequate use of the Technical Trading Rules (TTR) could help investors obtain the desired profits on their investments. Method: We compare the performance of active strategies based on classical TTRs with a proposal based on the momentum indicator, and then all of them with those obtained from the passive strategy of buy-and-hold. Reality Check and Superior Predictive Ability tests are employed to account for possible data snooping bias. Results: It is shown that the classical rules perform worse than a proposed rule based on the Rate of Change. Additionally, when we employ an ETF which tracks the smaller companies, we obtain higher performances than those obtained for larger companies. Contributions: This analysis is especially interesting because, to our knowledge, there is no empirical evidence in that sense for the Brazilian stock market. Additionally, we extend the previous evidence by focusing on three ETFs that track large, medium and small companies of the Brazilian stock market and, therefore, the results obtained from our analysis will provide a better vision of the investment opportunities than what the previous empirical evidence has shown.• Junta de Extremadura. V Plan Regional de Investigación y Desarrollo. Ayuda GR15027peerReviewe

Placement of dynamic data objects over heterogeneous memory organizations in embedded systems

Tesis inédita de la Universidad Complutense de Madrid, Facultad de Informática, Departamento de Arquitectura de Computadoras y Automática, leída el 24-11-2015Depto. de Arquitectura de Computadores y AutomáticaFac. de InformáticaTRUEunpu

Using SMILES strings for the description of chemical connectivity in the Crystallography Open Database

Computer descriptions of chemical molecular connectivity are necessary for searching chemical databases and for predicting chemical properties from molecular structure. In this article, the ongoing work to describe the chemical connectivity of entries contained in the Crystallography Open Database (COD) in SMILES format is reported. This collection of SMILES is publicly available for chemical (substructure) search or for any other purpose on an open-access basis, as is the COD itself. The conventions that have been followed for the representation of compounds that do not fit into the valence bond theory are outlined for the most frequently found cases. The procedure for getting the SMILES out of the CIF files starts with checking whether the atoms in the asymmetric unit are a chemically acceptable image of the compound. When they are not (molecule in a symmetry element, disorder, polymeric species,etc.), the previously published cif_molecule program is used to get such image in many cases. The program package Open Babel is then applied to get SMILES strings from the CIF files (either those directly taken from the COD or those produced by cif_molecule when applicable). The results are then checked and/or fixed by a human editor, in a computer-aided task that at present still consumes a great deal of human time. Even if the procedure still needs to be improved to make it more automatic (and hence faster), it has already yielded more than 160,000 curated chemical structures and the purpose of this article is to announce the existence of this work to the chemical community as well as to spread the use of its results.The authors are grateful to the Junta de Andalucía (Research Group FQM-195) for financial support of the publication costs of this article

Using SMILES strings for the description of chemical connectivity in the Crystallography Open Database

Computer descriptions of chemical molecular connectivity are necessary for searching chemical databases and for predicting chemical properties from molecular structure. In this article, the ongoing work to describe the chemical connectivity of entries contained in the Crystallography Open Database (COD) in SMILES format is reported. This collection of SMILES is publicly available for chemical (substructure) search or for any other purpose on an open-access basis, as is the COD itself. The conventions that have been followed for the representation of compounds that do not fit into the valence bond theory are outlined for the most frequently found cases. The procedure for getting the SMILES out of the CIF files starts with checking whether the atoms in the asymmetric unit are a chemically acceptable image of the compound. When they are not (molecule in a symmetry element, disorder, polymeric species,etc.), the previously published cif_molecule program is used to get such image in many cases. The program package Open Babel is then applied to get SMILES strings from the CIF files (either those directly taken from the COD or those produced by cif_molecule when applicable). The results are then checked and/or fixed by a human editor, in a computer-aided task that at present still consumes a great deal of human time. Even if the procedure still needs to be improved to make it more automatic (and hence faster), it has already yielded more than 160,000 curated chemical structures and the purpose of this article is to announce the existence of this work to the chemical community as well as to spread the use of its results.The authors are grateful to the Junta de Andalucía (Research Group FQM-195) for financial support of the publication costs of this article

4,7-Phenanthrolinium perchlorate-5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7(4H)-one-water (1/1/2)

The asymmetric unit of the title compound, C12H9N2+·ClO4-·C6H6N4O·2H2O, contains a monoprotonated 4,7-phenanthrolinium (47phen) cation, a perchlorate anion balancing its charge, a neutral molecule of 5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7(4H)-one (HmtpO) and two interstitial water molecules. In the crystal structure, the acidic H atoms of 47phenH+ and HmtpO form strong hydrogen bonds with the water molecules, which in turn act as hydrogen-bond donors, forming links between them and towards the carbonyl O atom of HmtpO, the non-protonated N atom of 47phen+ and one of the O atoms of the anion.We acknowledge financial support from the Spanish Ministerio de Ciencia y Tecnología (project CTQ2008–00037/PPQ) and from the Junta de Andalucía (research group FQM 195). ABC is grateful for a FPU grant from the Spanish Ministerio de Educación y Ciencia

Fractional Control of a Humanoid Robot Reduced Model with Model Disturbances

There is an open discussion between those who defend mass-distributed models for humanoid robots and those in favor of simple concentrated models. Even though each of them has its advantages and disadvantages, little research has been conducted analyzing the control performance due to the mismatch between the model and the real robot, and how the simplifications affect the controller's output. In this article we address this problem by combining a reduced model of the humanoid robot, which has an easier mathematical formulation and implementation, with a fractional order controller, which is robust to changes in the model parameters. This controller is a generalization of the well-known proportional-integral-derivative (PID) structure obtained from the application of Fractional Calculus for control, as will be discussed in this article. This control strategy guarantees the robustness of the system, minimizing the effects from the assumption that the robot has a simple mass distribution. The humanoid robot is modeled and identified as a triple inverted pendulum and, using a gain scheduling strategy, the performances of a classical PID controller and a fractional order PID controller are compared, tuning the controller parameters with a genetic algorithm.The research leading to these results has received funding from the ARCADIA project DPI2010-21047- C02-01, funded by CICYT project grant on behalf of Spanish Ministry of Economy and Competitiveness, and from the RoboCity2030-II-CM project (S2009/DPI-1559), funded by the Research and Development Work Programme of the Community of Madrid and cofunded by Structural Funds of the EU.Publicad

As diferenças em torno dos valores culturais: um estudo empírico a partir de entidades listadas em índices europeus.

Artigo em revista científica internacional com arbitragem científicaA influência do fator cultural no âmbito da subcultura da Contabilidade é reconhecida pela literatura, que não descura os seus eventuais impactos na comparabilidade do relato financeiro. A presente investigação visa aferir a eventual existência de distintos níveis de valores culturais propostos por Gray (1988) em função de agrupamentos regionais. Adicionalmente, pretende-se testar a existência de uma eventual associação entre os referidos valores culturais. A recolha dos dados foi realizada a partir dos relatórios e contas consolidados anuais, referentes a 2013 e 2014, divulgados pelas entidades cotadas (grupos não financeiros) nos índices bolsistas relativos a mercados financeiros da União Europeia (UE), tendo sido utilizada a análise de conteúdo como metodologia. Após a aplicação de critérios específicos de seleção, a população final deste estudo é constituída por 137 entidades. Os resultados obtidos a partir da aplicação de técnicas de análise não-paramétricas bivariadas sugerem que o conservadorismo distingue-se em função de alguns agrupamentos regionais. Constata-se ainda a existência de uma conexão positiva entre o conservadorismo e o secretismo. Um dos contributos desta investigação consiste, entre outros, na identificação do potencial impacto da cultura sobre o julgamento profissional, mesmo no contexto do avançado processo de harmonização contabilística internacional em curso.The influence of cultural factor within the subculture of accounting is recognized by the literature, that does not neglect its possible impact on comparability of financial reporting. This research seeks to analyze the possible existence of distinct levels of cultural values proposed by Gray (1988) on the basis of regional groups. Additionally, it is intended to test the existence of a possible association between the cultural values, as well as between these and the qualitative characteristics. Data collection was carried out from the reports and consolidated annual accounts, for 2013 and 2014, disclosed by non-financial entities listes in stock indexes relating to financial markets of the European Union, having been used as content analysis methodology. After the application of the selection criteria, the final population of this study encompasses 137 entities. The findings based on the application of non-parametric bivariate analysis techniques suggest that the conservatism could be distinguished on the basis of some regional groups. The existence of a positive connection between conservatism and secrecy is equally noticed. One of the contributions of this investigation is constituted by, among others, the identification of the potential impact of culture in the context of professional judgment, even in the context of advanced international accounting harmonisation process.info:eu-repo/semantics/publishedVersio