Refrigerador doméstico con efecto Peltier, acumuladores térmicos y termosifones evaporativos

Referencia OEPM: P9801016.-- Fecha de solicitud: 14/05/1998.-- Titular: Consejo Superior de Investigaciones Científicas (CSIC).La patente se refiere a instalaciones frigoríficas que funcionan gracias a la combinación de elementos productores de efecto Peltier y termosifones con cambio de fase líquido-vapor. Básicamente consta de: 1) Recinto de refrigeración. 2) Disipador de calor. 3) Un circuito cerrado y estanco conteniendo un fluido, que hierve o se evapora. 4) Elementos de efecto Peltier (primera etapa). 5) Termosifón que transporta el calor, a las caras frías de las pastillas de efecto Peltier de la primera etapa. 6) Termosifón que intercambia el calor con el anterior y transporta éste de las caras calientes de las pastillas Peltier de la segunda etapa. 7) Elementos de efecto Peltier (segunda etapa). 8) Termosifón que transporta el calor, del recinto a baja temperatura, a las caras frías de las placas Peltier de la segunda etapa.Peer reviewe

A sufficient condition to polynomially compute a minimum separating DFA

This is the author’s version of a work that was accepted for publication in Information Sciences. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Information Sciences 370–371 (2016) 204–220. DOI 10.1016/j.ins.2016.07.053.The computation of a minimal separating automaton (MSA) for regular languages has been studied from many different points of view, from synthesis of automata or Grammatical Inference to the minimization of incompletely specified machines or Compositional Verification. In the general case, the problem is NP-complete, but this drawback does not prevent the problem from having a real application in the above-mentioned fields. In this paper, we propose a sufficient condition that guarantees that the computation of the MSA can be carried out with polynomial time complexity. © 2016 Elsevier Inc. All rights reserved.Vázquez-De-Parga Andrade, M.; García Gómez, P.; López Rodríguez, D. (2016). A sufficient condition to polynomially compute a minimum separating DFA. Information Sciences. 370-371:204-220. doi:10.1016/j.ins.2016.07.053S204220370-37

DFA minimization: Double reversal versus split minimization algorithms

“NOTICE: this is the author’s version of a work that was accepted for publication in Theoretical Computer Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published inTheoretical Computer Science, [Volume 583, 7 June 2015, Pages 78–85] DOI 10.1016/j.tcs.2015.04.002In this paper, we show the relationship between the two most widely used approaches for the minimization of deterministic finite automata: minimization by split of partitions and minimization by double reversal. Even though the double reversal approach has usually been considered to be unconventional with respect to the more common split approach, we show that any double reversal minimization algorithm can be related to a split minimization algorithm and vice versa.García Gómez, P.; López Rodríguez, D.; Vázquez-De-Parga Andrade, M. (2015). DFA minimization: Double reversal versus split minimization algorithms. Theoretical Computer Science. 583:78-85. doi:10.1016/j.tcs.2015.04.002788558

Experiencia de clase inversa en el grado de ingeniería informática

La amplia disponibilidad de herramientas de generación de contenido multimedia hace posible la incorporación de nuevos recursos que complementen la actividad habitual en el aula. En la experiencia que se expone, se analizaron los recursos que existían relacionados con la materia de Teoría de Autómatas del Grado de Informática de la Universidad Politécnica de Valencia. Este análisis permitió detectar algunos aspectos clave que no eran convenientemente asimilados por el alumnado. Para cada uno de estos se elaboró material audiovisual que presentaba el contenido así como ejercicios de autoevaluación a realizar antes de la clase presencial. Se comprobó que el efecto de facilitar de forma anticipada al estudiante de este material permite al alumno, si bien en principio no completamente, trabajar ciertos conceptos, permitiendo plantear las dudas de forma más orientada. Pese a que el grupo piloto de esta experiencia estaba formado exclusivamente por voluntarios, lo que puede suponer un sesgo en la valoración, la experiencia se considera muy positiva

Narrowing the Tolerance Factor Limits for Hybrid Organic-Inorganic Dicyanamide-Perovskites

[Abstract] In this work we focus in setting the limits of the tolerance factor and the size of the A-cations that stabilize the perovskite structure in hybrid dicyanamide compounds [A][Mn(dca)3]. For this purpose, we propose an alternative, simple approach to calculate a more realistic effective ionic radius for the large and anisotropic A-cations often present in these type of compounds. We test the proposed procedure by analysing the crystal structures of [A][Mn(dca)3] dicyanamide hybrids reported in the literature and recalculating the tolerance factors of such compounds, as well as by preparing five new [A][Mn(dca)3] members, discussing also the influence of the A-cation shape in the stability limits of the perovskite structure. Interestingly, such methodology is not only useful to develop new compounds of the emerging family of (multi)functional multi(stimuli)-responsive dicyanamide materials but can also be applied to other hybrid organic-inorganic perovskites and related materials.As for financial support, the authors thank Ministerio de Economía y Competitividad MINECO and EU-FEDER (projects MAT2017-86453-R and PDC2021-121076-I00), and Xunta de Galicia for the collaboration agreement “Development of research strategic actions Universidade da Coruña I ​+ ​D ​+ ​i 2021–2022: CICA-Disrupting Projects 2021SEM-A3 (NanoCool). J.G.-B. and J.M.B.-G. acknowledge Xunta de Galicia for Predoctoral and Postdoctoral Fellowships, respectively. I.D.-F thanks Ministerio de Universidades for a FPU Predoctoral Fellowship. A. G.-F. and U.B.C thank the Carl Tryggers foundation and the Göran Gustafsson foundation for financial suppor

Impact of glucose oxidase treatment in high sugar and pH musts on volatile composition of white wines

Producción CientíficaClimate change is modifying the composition of the grapes, increasing sugar and pH levels, which produces unbalanced wines with high alcohol degree, low acidity and poor aromatic notes. In this study, glucose oxidase (GOX) and catalase (CAT) were applied in white must with high sugar content and pH (>3.8) to simultaneously decrease glucose concentration and pH. The effect of enzyme treatment on volatile composition of wine was investigated. A concentration of 0.17 mkat/L for both GOX and CAT was sufficient to produce a remarkable reduction of glucose concentration in the must (61.5 g/L), achieving similar results within the pH range of 3–4. The musts subjected to enzymatic treatment yielded more balanced wines, lowering their alcohol content by 10–27 mL/L and pH by 0.3–0.5, while leaving their chromatic characteristics unchanged compared to the control wines. As positive effects, enzyme treatment reduced the concentrations of C6-alcohols with green-herbaceous notes and high-chain ethyl esters with soapy notes in wines, and did not modify the concentrations of short-chain ethyl esters, acids and higher alcohols. However, the concentrations of heptyl acetate and 2-phenylethanol with floral notes, and some ketones with floral and fruit notes, were lower in wines from treated musts

Tratamiento quirúrgico del Tumor de Koënen: expresión podológica de la Esclerosis Tuberosa

The Koenen tumors are cutaneous manifestations of tuberous sclerosis, which is of systemic involvement and sometimes with location in the foot. The knowledge of this type of dermatological is very important for proper treatment and for this reason an interdisciplinary approach is essential for the accurate and early diagnosis. In the clinical history is important to make an assessment of family history, perform a scan of the skin and a neurological study. We report a case with symptoms consistent with the presence of tumor Koenen. The differential diagnosis is essential for planning treatment and get a good outcome and speedy recovery.Conclusions. Surgical treatment is proposed as a technique of choice despite the high rate of recurrence presents such treatment. Surgical resection of the lesion allows the pathological diagnosis.Los Tumores de Koënen son manifestaciones cutáneas de la Esclerosis Tuberosa, que es de afectación sistémica y en ocasiones con localización en el pie. El conocimiento de este tipo de afecciones dermatológicas es muy importante para un tratamiento correcto y por este motivo un enfoque interdisciplinario es esencial para que el diagnóstico sea preciso y precoz. En la Historia Clínica es importante realizar una valoración de los antecedentes familiares, realizar una exploración de la piel y un estudio neurológico. Se presenta un caso con clínica compatible con la presencia de Tumor de Koënen. El diagnostico diferencial es esencial para plantear el tratamiento y conseguir un buen pronóstico y pronta curación. Conclusiones. Se plantea el tratamiento quirúrgico como técnica de elección pese a la elevada tasa de recidivas que presenta dicho tratamiento. La resección quirúrgica de la lesión permite el diagnóstico anatomopatologico

Techno-economic assessment of a membrane-based wastewater reclamation process

Reclaimed water plays a crucial role in the water cycle since it constitutes an effective way to improve the utilization of water resources and can help to cope with the water crisis. Membrane technologies for wastewater reclamation, especially ultrafiltration (UF) and reverse osmosis (RO), have received great attention in the past decades. In this work, an integrated prototype (2.5 m3 /h) based on the combination of UF and RO was operated in Vuelta Ostrera municipal wastewater treatment plant, located in the proximity of an industrial hub, to obtain water with the required quality for being industrially reused complying with Spanish law and the needs of industrial users. The influence of the process variables on water recovery was studied. Filtration time, backwash cycles duration and frequency, and the addition (or not) of coagulant, were the main variables studied during UF operation, while the recirculation rate of the concentrate stream and the UF permeate quality were the main variables for RO operation. Finally, the economic evaluation pointed to important savings in the OPEX of the process, when compared to the prize that industrial users are currently paying for water.This work has been performed within financial support from projects PID2019-105827RB-I00 and RTI2018-093310-B-I00 – Agencia Estatal de Investigación, Spain

A split-based incremental deterministic automata minimization algorithm

The final publication is available at Springer via http://dx.doi.org/10.1007/s00224-014-9588-y. La fecha de publicación corresponde a la versión First OnlineWe here study previous results due to Hopcroft and Almeida et al. to propose an incremental split-based deterministic automata minimization algorithm whose average running-time does not depend on the size of the alphabet. The experimentation carried out shows that our proposal outperforms the algorithms studied whenever the automata have more than a (quite small) number of states and symbols.García Gómez, P.; Vázquez-De-Parga Andrade, M.; Velasco, JA.; López Rodríguez, D. (2014). A split-based incremental deterministic automata minimization algorithm. Theory of Computing Systems. 1-18. doi:10.1007/s00224-014-9588-y118Hopcroft, J.E., Ullman, J.D.: Introduction to Automata Theory, Languages and Computation. Addison-Wesley Publishing Company (1979)Watson, B.W., Daciuk, J.: An efficient incremental DFA minimization algorithm. Nat. Lang. Eng. 9(1), 49–64 (2003)Almeida, M., Moreira, N., Reis, R.: Incremental DFA minimisation. In: Domaratzki, M., Salomaa, K. (eds.) CIAA, of Lecture Notes in Computer Science, vol. 6482, pp 39–48. Springer (2010)Hopcroft, J.E.: An n ⋅ log n $n\cdot \log n$ algorithm for minimizing states in a finite automaton. Technical report, Stanford, University, Stanford (1971)Moore, E.F.: Gedanken experiments on sequential machines. In: Shannon, C.E., Mc-Carthy, J. (eds.) Automata Studies. Princeton Universty Press, Princeton (1956)Berstel, J., Boasson, L., Carton, O., Fagnot, I.: Automata: from Mathematics to Applications, chapter Minimization of automata. European Mathematical Society. (arXiv: 1010.5318v3. ) To appear.David, J.: Average complexity of Moore’s and Hopcroft’s algorithms. Theor. Comput. Sci. 417, 50–65 (2012)Almeida, M., Moreira, N., Reis, R.: Aspects of enumeration and generation with a string automata representation. In: Leung, H., Pighizzini, G. (eds.) DCFS, pp 58–69. New Mexico State University, Las Cruces (2006)Gries, D.: Describing an algorithm by Hopcroft. Acta Informatica 2, 97–109 (1973)Aho, A., Hopcroft, J.E., Ullman, J.D.: The Design and Analysis of Computer Algorithms. Addison-Wesley Publishing Company (1974)Blum, N.: A O ( n log n ) $\mathcal {O}(n\log n)$ implementation of the standard method for minimizing n-state finite automata. Inf. Process. Lett. 57, 65–69 (1996)Knuutila, T.: Re-describing an algorithm by Hopcroft. Theor. Comput. Sci. 250, 333–363 (2001)Veanes, M.: Minimization of symbolic automata. Technical report, Microsoft Research, MSR-TR-2013-48 (2013)Lothaire, M.: Applied Combinatorics on Words chap. 1. Cambridge University Press, Cambridge (2005

Method of Moments Optimization of Distributed Raman Amplification in Fibers with Randomly Variying Birefringence

In this work, we develop a vectorial model, for optical communications, using distributed Raman amplification (DRA) applied to vectorial soliton pulses in monomode fiber optics. The main result, a dependent polarization effective Raman gain coefficient, is calculated considering the random birefringence character of the fiber and the relative mismatch between the continuous wave (CW) pump and the signal. The Method of Moments allows the determination of the optimal initial conditions to achieve a better performance in our system. With these starting values, the simulations carried out with the Split-Step Fourier Method (SSFM) elucidate the influence of the peak power and prechirping initial phase control on the vectorial soliton propagation