No advantageous merging in minimum cost spanning tree problems

In the context of cost sharing in minimum cost spanning tree problems, we introduce a property called No Advantageous Merging. This property implies that no group of agents can be better off claiming to be a single node. We show that the sharing rule that assigns to each agent his own connection cost (the Bird rule) satisfies this property. Moreover, we provide a characterization of the Bird rule using No Advantageous Merging.Minimum cost spanning tree problems; cost sharing; Bird rule; No Advantageous Merging

Teoría y método del grupo operativo.

Antologí

PVT-Robust CMOS Programmable Chaotic Oscillator: Synchronization of Two 7-Scroll Attractors

Designing chaotic oscillators using complementary metal-oxide-semiconductor (CMOS) integrated circuit technology for generating multi-scroll attractors has been a challenge. That way, we introduce a current-mode piecewise-linear (PWL) function based on CMOS cells that allow programmable generation of 2–7-scroll chaotic attractors. The mathematical model of the chaotic oscillator designed herein has four coefficients and a PWL function, which can be varied to provide a high value of the maximum Lyapunov exponent. The coefficients are implemented electronically by designing operational transconductance amplifiers that allow programmability of their transconductances. Design simulations of the chaotic oscillator are provided for the 0.35μ m CMOS technology. Post-layout and process–voltage–temperature (PVT) variation simulations demonstrate robustness of the multi-scroll chaotic attractors. Finally, we highlight the synchronization of two seven-scroll attractors in a master–slave topology by generalized Hamiltonian forms and observer approach. Simulation results show that the synchronized CMOS chaotic oscillators are robust to PVT variations and are suitable for chaotic secure communication applications.Universidad Autónoma de Tlaxcala CACyPI-UATx-2017Program to Strengthen Quality in Educational Institutions C/PFCE-2016-29MSU0013Y-07-23National Council for Science and Technology 237991 22284

Elaboracion y normalizacion de una prueba de habla filtrada en pasa bajo

49 p.Existen variados estudios sobre PAC que prácticamente no pueden ser válidos para la población sudamericana, debido a que la calibración fonética de las palabras estudiadas no se rige por las mismas reglas del continente hispano y eso complica la inteligibilidad y el procesamiento de las propiedades auditivas. El propósito de este trabajo fue elaborar y normalizar una prueba de habla filtrada con pasa bajo para una población de adultos chilenos. Se evaluaron 51 jóvenes de un rango de edad de 18 a 24 años pertenecientes a la Universidad de Talca de la carrera de Fonoaudiología. Para ello, se utilizaron 70 monosílabos filtrados, los cuales fueron validados mediante análisis estadístico y posterior a ello, se procedió a obtener la confiabilidad de este grupo de palabras. De estos estímulos, sólo cumplieron con los criterios de validez y confiabilidad 13 monosílabos. Además se obtuvieron datos de normalización los cuales aportarán información necesaria para futuros fines audiológicos y diagnósticos en personas con Trastornos en el Procesamiento Auditivo Central (TPAC)

Sense and sensitivity of double beta decay experiments

The search for neutrinoless double beta decay is a very active field in which the number of proposals for next-generation experiments has proliferated. In this paper we attempt to address both the sense and the sensitivity of such proposals. Sensitivity comes first, by means of proposing a simple and unambiguous statistical recipe to derive the sensitivity to a putative Majorana neutrino mass, m_bb. In order to make sense of how the different experimental approaches compare, we apply this recipe to a selection of proposals, comparing the resulting sensitivities. We also propose a "physics-motivated range" (PMR) of the nuclear matrix elements as a unifying criterium between the different nuclear models. The expected performance of the proposals is parametrized in terms of only four numbers: energy resolution, background rate (per unit time, isotope mass and energy), detection efficiency, and bb isotope mass. For each proposal, both a reference and an optimistic scenario for the experimental performance are studied. In the reference scenario we find that all the proposals will be able to partially explore the degenerate spectrum, without fully covering it, although four of them (KamLAND-Zen, CUORE, NEXT and EXO) will approach the 50 meV boundary. In the optimistic scenario, we find that CUORE and the xenon-based proposals (KamLAND-Zen, EXO and NEXT) will explore a significant fraction of the inverse hierarchy, with NEXT covering it almost fully. For the long term future, we argue that Xe-based experiments may provide the best case for a 1-ton scale experiment, given the potentially very low backgrounds achievable and the expected scalability to large isotope masses.Comment: 30 pages, 12 figures, 6 table

Thermalization and Cooling of Plasmon-Exciton Polaritons: Towards Quantum Condensation

We present indications of thermalization and cooling of quasi-particles, a precursor for quantum condensation, in a plasmonic nanoparticle array. We investigate a periodic array of metallic nanorods covered by a polymer layer doped with an organic dye at room temperature. Surface lattice resonances of the array---hybridized plasmonic/photonic modes---couple strongly to excitons in the dye, and bosonic quasi-particles which we call plasmon-exciton-polaritons (PEPs) are formed. By increasing the PEP density through optical pumping, we observe thermalization and cooling of the strongly coupled PEP band in the light emission dispersion diagram. For increased pumping, we observe saturation of the strong coupling and emission in a new weakly coupled band, which again shows signatures of thermalization and cooling.Comment: 8 pages, 5 figures including supplemental material. The newest version includes new measurements and corrections to the interpretation of the result

ADMINISTRACIÓN PARA EL DESARROLLO LOCAL: EXPERIENCIAS DE PRODUCTORES DE HORTALIZAS EN LA REGIÓN III FRONTERIZA DE CHIAPAS

This paper is meant to share results with the academic community, specialists and agricultural management experts, this results are related to the Project “Análisis y Propuestas para el Desarrollo Organizacional de la Integradora de la Frontera Sur, S.A. de C.V.†(Analysis and proposals for the Organization Development of Integradora de la Frontera Sur, S.A. de C.V.). This project was sponsored by Universidad Autónoma de Chiapas and by Campesinos Unidos de Comitán, which is a private association of producers. This borderland is located in southern Mexico in the State of Chiapas and specifically in the municipalities of Tzimol, La Trinitaria, Comitán y La Independencia, where the producers organization has its own greenhouses and commercialization places. The project focused on analysing and studying the specific business activities that some companies develop in order to generate business management knowledge. There were involved activities related to research, teaching and entailment. This means; research activity was of main interest, but the team also promoted teaching and entailment activities. In this sense, the general objective, which guided the work, it was analyzed the management status of La Integradora de la Frontera Sur, S.A. de C.V. This analysis took place in the light of the theories related to Business Administration to generate tangible proposals to improve it. Particular objectives were to propose specific management strategies and to develop a short training program. The scheme of work was raised from the participant focus; this means the owners were given a relevant participant role during the process. This way they could promote and include their point of view regarding tangible proposals. This is relevant in the light of the actor oriented development theory. In the process of diagnosis, the company defined as a priority for the current stage of its organizational development topics regarding human resources (especially about new personnel), control sales and advertising their products. This document focuses on the two first topics that have been developed at this point of the first stage of the research work.Control for sales, human resources, induction, Chiapas, vegetable producers, local development, actor oriented development, social capital., Agribusiness,

Bioinformatics strategies for lipidomics analysis: characterization of obesity related hepatic steatosis.

BACKGROUND: Lipids are an important and highly diverse class of molecules having structural, energy storage and signaling roles. Modern analytical technologies afford screening of many lipid molecular species in parallel. One of the biggest challenges of lipidomics is elucidation of important pathobiological phenomena from the integration of the large amounts of new data becoming available. RESULTS: We present computational and informatics approaches to study lipid molecular profiles in the context of known metabolic pathways and established pathophysiological responses, utilizing information obtained from modern analytical technologies. In order to facilitate identification of lipids, we compute the scaffold of theoretically possible lipids based on known lipid building blocks such as polar head groups and fatty acids. Each compound entry is linked to the available information on lipid pathways and contains the information that can be utilized for its automated identification from high-throughput UPLC/MS-based lipidomics experiments. The utility of our approach is demonstrated by its application to the lipidomic characterization of the fatty liver of the genetically obese insulin resistant ob/ob mouse model. We investigate the changes of correlation structure of the lipidome using multivariate analysis, as well as reconstruct the pathways for specific molecular species of interest using available lipidomic and gene expression data. CONCLUSION: The methodology presented herein facilitates identification and interpretation of high-throughput lipidomics data. In the context of the ob/ob mouse liver profiling, we have identified the parallel associations between the elevated triacylglycerol levels and the ceramides, as well as the putative activated ceramide-synthesis pathways.RIGHTS : This article is licensed under the BioMed Central licence at http://www.biomedcentral.com/about/license which is similar to the 'Creative Commons Attribution Licence'. In brief you may : copy, distribute, and display the work; make derivative works; or make commercial use of the work - under the following conditions: the original author must be given credit; for any reuse or distribution, it must be made clear to others what the license terms of this work are

Photosynthetic and antioxidant responses of Mexican lime (Citrus aurantifolia) plants to Citrus tristeza virus infection

The effect of Citrus tristeza virus (CTV) infection on photosynthetic activity and antioxidant metabolism was analysedin plants of the highly susceptible citrus genotype Mexican lime (Citrus aurantifolia). Two virus isolates differing intheir virulence (the severe T318 and the mild T385) were used in the experiments. CTV infection caused a reduction inphotosynthetic capacity in infected plants. This limitation was mainly due to a reduction in the carboxylative efficiencywhereas the limitation of CO2diffusion through the stoma had lower impact. The virus did not damage the antennaeand did not reduce the efficiency of light harvesting complexes. Oxidative damage occurred in infected plants, as evi-denced by the increase in malondialdehyde levels. Indeed, CTV infection caused an increase in ascorbate peroxidaseactivity in new shoots developed in infected plants during the 2 years of the experiment. Data suggest that the H2O2removal machinery was not damaged as a result of stress but the defence mechanism was overwhelmed with time dueto the continuing pressure of biotic stressUniversitat Jaume I (SPAIN) P1IB2012-06 P1IB2013-23 Spanish Ministerio de Economia y Competitividad (MINECO) AGL2010-22195-C03-0