Optimal investment under behavioural criteria -- a dual approach

We consider a discrete-time, generically incomplete market model and a behavioural investor with power-like utility and distortion functions. The existence of optimal strategies in this setting has been shown in a previous paper under certain conditions on the parameters of these power functions. In the present paper we prove the existence of optimal strategies under a different set of conditions on the parameters, identical to the ones which were shown to be necessary and sufficient in the Black-Scholes model. Although there exists no natural dual problem for optimisation under behavioural criteria (due to the lack of concavity), we will rely on techniques based on the usual duality between attainable contingent claims and equivalent martingale measures.Comment: Forthcoming in Banach Center Publications. Some errors have been corrected, in particular in Assumption 2.3

Validation of microsatellite markers for cytotype discrimination in the model grass Brachypodium distachyon

Brachypodium distachyon (2n = 2x = 10) is a small annual grass species where the existence of three different cytotypes (10, 20 and 30 chromosomes) has long been regarded as a case of autopolyploid series, with x = 5. However, it has been demonstrated that the cytotypes assumed to be polyploids represent two separate Brachypodium species recently named as B. stacei (2n = 2x = 20) and B. hybridum (2n = 4x = 30). The aim of this study was to find a PCR-based alternative approach that could replace standard cytotyping methods (i. e., chromosome counting and flow cytometry) to characterize each of the three Brachypodium species. We have analyzed with four microsatellite (SSR) markers eighty-three Brachypodium distachyon-type lines from varied locations in Spain, including the Balearic and Canary Islands. Within this set of lines, 64, 4 and 15 had 10, 20 and 30 chromosomes, respectively. The surveyed markers produced cytotype-specific SSR profiles. So, a single amplification product was generated in the diploid samples, with non-overlapping allelic ranges between the 2n = 10 and 2n = 20 cytotypes, whereas two bands, one in the size range of each of the diploid cytotypes, were amplified in the 2n = 30 lines. Furthermore, the remarkable size difference obtained with the SSR ALB165 allowed the identification of the Brachypodium species by simple agarose gel electrophoresis

Web Page Retrieval by Combining Evidence

The participation of the REINA Research Group in WebCLEF 2005 focused in the monolingual mixed task. Queries or topics are of two types: named and home pages. For both, we first perform a search by thematic contents; for the same query, we do a search in several elements of information from every page (title, some meta tags, anchor text) and then we combine the results. For queries about home pages, we try to detect using a method based in some keywords and their patterns of use. After, a re-rank of the results of the thematic contents retrieval is performed, based on Page-Rank and Centrality coeficients

Completeness in the Mackey topology by norming subspaces

[EN] We study the class of Banach spaces X such that the locally convex space (X, mu(X,Y)) is complete for every norming and norm-closed subspace Y subset of X*, where mu(X, Y) denotes the Mackey topology on X associated to the dual pair . Such Banach spaces are called fully Mackey complete. We show that fully Mackey completeness is implied by Efremov's property (epsilon) and, on the other hand, it prevents the existence of subspaces isomorphic to l(1)(omega(1)). This extends previous results by Guirao et al. (2017) [9] and Bonet and Cascales (2010) [3]. Further examples of Banach spaces which are not fully Mackey complete are exhibited, like C[0, omega(1)] and the long James space J(omega(1)). Finally, by assuming the Continuum Hypothesis, we construct a Banach space with w*-sequential dual unit ball which is not fully Mackey complete. A key role in our discussion is played by the (at least formally) smaller class of Banach spaces X such that (Y, w*) has the Mazur property for every norming and norm-closed subspace Y subset of X*. (C) 2019 Elsevier Inc. All rights reserved.The authors wish to thank A. Aviles for valuable discussions on the topic of this paper. They are also grateful to the referee for his/her comments and suggestions. A.J. Guirao was supported by projects MTM2017-83262-C2-1-P (AEI/FEDER, UE) and 19368/PI/14 (Fundacion Seneca). G. Martinez-Cervantes and J. Rodriguez were supported by projects MTM2014-54182-P and MTM2017-86182-P (AEI/FEDER, UE) and 19275/PI/14 (Fundacion Seneca).Guirao Sánchez, AJ.; Martínez-Cervantes, G.; Rodríguez Ruiz, J. (2019). Completeness in the Mackey topology by norming subspaces. Journal of Mathematical Analysis and Applications. 478(2):776-789. https://doi.org/10.1016/j.jmaa.2019.05.054S776789478

Transferencia de operación de manufactura de EE. UU. a México. Estudio de caso

Companies are continuously looking for resources and skills which lead them to a higher performance. Companies should manage not only the resource access, but a collaborative strategy as well, which maximizes the benefits of a healthy and constructive interaction expected between customer and provider. This paper analyzes the case of a company accustomed to operate with a traditional business model, and the paradigm shift that was necessary as a result of its exposure to the new customer’s requirements and demands for total openness, cooperation and transparency.Las empresas están permanentemente en búsqueda de recursos y capacidades que las habiliten hacia un nivel superior de desempeño. Es necesario que la empresa administre la estrategia colaborativa que maximice los beneficios de esa interacción sana y constructiva que se espera entre cliente y proveedor. En este documento se analiza el caso de una empresa acostumbrada a operar con un modelo de negocios tradicional, y el cambio de paradigma que fue necesario adoptar, como resultado de su exposición a los nuevos requerimientos y exigencias del cliente, que demanda apertura, colaboración, y transparencia

The band spectrum of periodic potentials with PT-symmetry

A real band condition is shown to exist for one dimensional periodic complex non-hermitian potentials exhibiting PT-symmetry. We use an exactly solvable ultralocal periodic potential to obtain the band structure and discuss some spectral features of the model, specially those concerning the role of the imaginary parameters of the couplings. Analytical results as well as some numerical examples are provided.Comment: 14 pages, 19 included figures (13 coloured). Submitted to J. Phys.

Kinetics and crystallization path of a Fe-based metallic glass alloy

The thermal stability and the quantification of the different transformation processes involved in the overall crystallization of the Fe50Cr15Mo14C15B6 amorphous alloy were investigated by several characterization techniques. Formation of various metastable and stable phases during the devitrification process in the sequence a-Fe, ¿-Cr6Fe18Mo5, M23(C,B)6, M7C3, ¿-Fe3Mo3C and FeMo2B2 (with M = Fe, Cr, Mo), was observed by in-situ synchrotron high energy X-ray diffraction and in-situ transmission electron microscopy. By combining these techniques with differential scanning calorimetry data, the crystallization states and their temperature range of stability under continuous heating were related with the evolution of the crystallized fraction and the phase sequence as a function of temperature, revealing structural and chemical details of the different transformation mechanisms.Postprint (published version

Effect of light and temperature on the development of turbot eggs

Different experiments were done to determine the effeets of light and temperature on the embryonie development of turbot eggs (Seophthalmus maximus L.) obtained in eaptivity. No signifieant differen~es have from fertilization to hC'tehing in the been found between time elapsed trials earried out wi th 24 hours of light and those done in dark eonditions,therefore light is not a determining faetor in the embryonie development of turbot eggs. The relation between temperature and time needed to reaeh eaeh embryonie stage, shows a elear inverse relationship. The exponential-potential equation whieh relates temperature and the age of the eggs, defined as the time in hours elapsed sinee fertilization, is: Y = 27.64 . e -0.11 T + 0.05 i . 1.21 1 r = 0.9904 paper also provides for eaeh experimental From the applieation of this equation, this th~ development eurves for eaeh embryonie stage temperature (in the range 10 QC to 20 QC)