281 research outputs found

    Coherent delocalization: Views of entanglement in different scenarios

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    The concept of entanglement was originally introduced to explain correlations existing between two spatially separated systems, that cannot be described using classical ideas. Interestingly, in recent years, it has been shown that similar correlations can be observed when considering different degrees of freedom of a single system, even a classical one. Surprisingly, it has also been suggested that entanglement might be playing a relevant role in certain biological processes, such as the functioning of pigment-proteins that constitute light-harvesting complexes of photosynthetic bacteria. The aim of this work is to show that the presence of entanglement in all of these different scenarios should not be unexpected, once it is realized that the very same mathematical structure can describe all of them. We show this by considering three different, realistic cases in which the only condition for entanglement to exist is that a single excitation is coherently delocalized between the different subsystems that compose the system of interest

    Driven Diffusive Systems: How Steady States Depend on Dynamics

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    In contrast to equilibrium systems, non-equilibrium steady states depend explicitly on the underlying dynamics. Using Monte Carlo simulations with Metropolis, Glauber and heat bath rates, we illustrate this expectation for an Ising lattice gas, driven far from equilibrium by an `electric' field. While heat bath and Glauber rates generate essentially identical data for structure factors and two-point correlations, Metropolis rates give noticeably weaker correlations, as if the `effective' temperature were higher in the latter case. We also measure energy histograms and define a simple ratio which is exactly known and closely related to the Boltzmann factor for the equilibrium case. For the driven system, the ratio probes a thermodynamic derivative which is found to be dependent on dynamics

    UHMWPE/HDPE in-reactor blends, prepared by in situ polymerization: synthetic aspects and characterization

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    This work covers the synthesis and characterization of in-reactor Ultra-High Molecular Weight Polyethylene/ High Density Polyethylene, UHMWPE/HDPE, blends by in situ polymerization in a single reactor, through dual catalyst immobilization. These blends are synthesized combining two different catalysts (one for each targeted molar mass) co-immobilized in mesoporous Santa Barbara Amorphous, SBA-15, particles. First, the ethylene polymerization behavior is investigated, under different polymerization conditions. Then, studies on the thermal, mechanical and rheological characteristics of the produced in-reactor blends are presented and their performance is compared and discussed in a comprehensive way. Moreover, the effect of different filler contents on the properties exhibited by the resulting materials is investigated. Results have shown that these in-reactor UHMWPE/HDPE blends exhibit a complex thermal, mechanical and rheological behavior, which depends mainly on the proportion between the two polymer components and on the amount of SBA-15.info:eu-repo/semantics/publishedVersio

    Self-assembly of Clicked Star-Shaped Triazines into Functional Nanostructures

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    Two non-amphiphilic star-shaped 2, 4, 6-tris(1, 2, 3-triazol-4-yl)-1, 3, 5-triazines showing different behavior in terms of self-assembly and luminescent properties are described. They aggregate in the liquid phase to form low-dimensional nanostructures with a variety of morphologies, such as spherical particles, one-hole hollow spheres, toroids, twisted fibers or helical nanotubes, just by varying the conditions of a straightforward reprecipitation method. Aggregation has an opposite effect concerning the fluorescent properties of the proposed compounds, either causing the enhancement or the quenching of the emission after the self-assembly. Quantum chemical calculations have been also performed to assist in the structural and electronic characterization of the two star-shaped compounds

    Microspore embryogenesis: assignment of genes to embryo formation and green vs. albino plant production

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    Plant microspores can be reprogrammed from their normal pollen development to an embryogenic route in a process termed microspore embryogenesis or androgenesis. Stress treatment has a critical role in this process, inducing the dedifferentiation of microspores and conditioning the following androgenic response. In this study, we have used three barley doubled haploid lines with similar genetic background but different androgenic response. The Barley1 GeneChip was used for transcriptome comparison of these lines after mannitol stress treatment, allowing the identification of 213 differentially expressed genes. Most of these genes belong to the functional categories “cell rescue, defense, and virulence”; “metabolism”; “transcription”; and “transport”. These genes were grouped into clusters according to their expression profiles among lines. A principal component analysis allowed us to associate specific gene expression clusters to phenotypic variables. Genes associated with the ability of microspores to divide and form embryos were mainly involved in changes in the structure and function of membranes, efficient use of available energy sources, and cell fate. Genes related to stress response, transcription and translation regulation, and degradation of pollen-specific proteins were associated with green plant production, while expression of genes related to plastid development was associated with albino plant regeneration

    Monte Carlo Analysis of a New Interatomic Potential for He

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    By means of a Quadratic Diffusion Monte Carlo method we have performed a comparative analysis between the Aziz potential and a revised version of it. The results demonstrate that the new potential produces a better description of the equation of state for liquid 4^4He. In spite of the improvement in the description of derivative magnitudes of the energy, as the pressure or the compressibility, the energy per particle which comes from this new potential is lower than the experimental one. The inclusion of three-body interactions, which give a repulsive contribution to the potential energy, makes it feasible that the calculated energy comes close to the experimental result.Comment: 36 pages, LaTex, 11 PostScript figures include

    Influence of the balanced scorecard on the science and innovation performance of Latin American universities

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    This is an Accepted Manuscript of an article published by Taylor & Francis in Knowledge Management Research & Practice on 2019, available online: http://www.tandfonline.com/10.1080/14778238.2019.1569488[EN] Pressure on the education system to meet society's needs has led some universities to adopt organisational performance measurement systems as strategic control tools. One of the most commonly used systems in business is the balanced scorecard (BSC). For Latin American universities, the urgent task of increasing the quantity and quality of research and innovation has led these universities to update their essential processes. A suitable control system is necessary to ensure the effectiveness of these new policies. Based on strategic management theory, this study focuses on the implementation of a BSC method in Latin American public universities. The aim of this study is to determine the influence of BSC implementation on universities? research and innovation performance. The results reveal similar patterns of indicators to measure performance in public universities. Furthermore, these indicators develop favourably following implementation of the BSC.Peris-Ortiz, M.; García-Hurtado, D.; Devece Carañana, CA. (2019). Influence of the balanced scorecard on the science and innovation performance of Latin American universities. Knowledge Management Research & Practice. 17(4):373-383. https://doi.org/10.1080/14778238.2019.1569488S373383174Agostino, D., & Arnaboldi, M. (2012). Design issues in Balanced Scorecards: The «what» and «how» of control. European Management Journal, 30(4), 327-339. doi:10.1016/j.emj.2012.02.001Al-Ashaab, A., Flores, M., Doultsinou, A., & Magyar, A. (2011). A balanced scorecard for measuring the impact of industry–university collaboration. Production Planning & Control, 22(5-6), 554-570. doi:10.1080/09537287.2010.536626Ankrah, S., & AL-Tabbaa, O. (2015). Universities–industry collaboration: A systematic review. 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    Curvature effects on the surface thickness and tension at the free interface of 4^4He systems

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    The thickness WW and the surface energy σA\sigma_A at the free interface of superfluid 4^4He are studied. Results of calculations carried out by using density functionals for cylindrical and spherical systems are presented in a unified way, including a comparison with the behavior of planar slabs. It is found that for large species WW is independent of the geometry. The obtained values of WW are compared with prior theoretical results and experimental data. Experimental data favor results evaluated by adopting finite range approaches. The behavior of σA\sigma_A and WσAW \sigma_A exhibit overshoots similar to that found previously for the central density, the trend of these observables towards their asymptotic values is examined.Comment: 35 pages, TeX, 5 figures, definitive versio
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