El "sistema de psicología" de Ortega y Gasset.

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Temas actuales de la psicología filosófica (Notas a un Congreso).

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Temperature dependence of surface stress across an order-disorder transition: p(1x2)O/W(110)

Strain relaxations of a p(1x2) ordered oxygen layer on W(110) are measured as a function of temperature across the disordering transition using low-energy electron diffraction. The measured strains approach values of 0.027 in the [1-10] and -0.053 in the [001] direction. On the basis of the measured strain relaxations, we give quantitative information on temperature-dependent surface stress using the results of ab initio calculations. From the surface formation energy for different strains, determined by first-principles calculations, we estimate that surface stress changes from -1.1 for the ordered phase to -0.2N/m for the disordered one along [1-10], and from 5.1 to 3.4 N/m along [001]. Moreover, our observation that the strains scale inversely with domain size confirms that the strain relaxation takes place at the domain boundaries.Comment: 8 pages, 5 figure

Occupational injuries and the “student syndrome” (or procrastination) on a large construction Project

Resumen Introducción: Hay una mayor incidencia de lesiones en los primeros días hábiles de la semana, y entre las 13:00 y las 17:00 horas. Se ha descrito una asociación entre algunas fechas especiales y cambios en la ocurrencia de muertes o enfermedades en diferentes países y regiones. Nuestra hipótesis fue que el cumplimiento de las obligaciones contractuales de una empresa puede convertirse en un desencadenante que aumenta la ocurrencia de lesiones laborales. Métodos: Nosotros analizamos los registros de lesiones e informes de nómina mensuales consolidados (de enero de 2012 a septiembre de 2013) para el personal que trabajaba en empresas que participaron en un megaproyecto para construir una carretera en Colombia. Este análisis informa una posible asociación entre las fechas de hitos contractuales financieramente importantes y una mayor ocurrencia de lesiones laborales. Pruebas binomiales de una cola se usaron para comparar la ocurrencia de lesiones uno y dos meses antes vs un mes después de cuatro fechas límite, correspondientes al 14, 3, 1 y 1% del presupuesto general, respectivamente. Resultados: La mayor incidencia de lesiones se observó durante el mes anterior a la fecha límite correspondiente al 14% del presupuesto (p=0,07). Discusión: Los hitos contractuales podrían actuar como determinantes distales, mientras que los errores humanos son determinantes proximales de las lesiones.Abstract Introduction: There is a higher occurrence of injuries on the first working days of the week, and between 13:00 and 17:00 hours. An association between some special dates and changes in the occurrence of deaths or diseases have been described in different countries and regions. Our hypothesis was that completing contractual obligations with a company may become triggers that increase the occurrence of occupational injuries. Methods: Injury records were analyzed and consolidated monthly payroll reports (from January 2012 to September 2013) for personnel operations who worked in companies that were involved in a megaproject to build a road in Colombia. This analysis reports a possible association between dates of financially important contractual milestones and a higher occurrence of occupational injuries. One-tailed binomial tests were used to compare the occurrence of injuries one and two months before and one month after four deadlines, corresponding to 14, 3, 1 and 1% of the overall budget, respectively. Results: The highest occurrence of injuries was observed during the month before the deadline corresponding to 14% of the budget (p=0.07). Discussion: Contractual milestones could act as distal determinant whereas human errors are proximal determinants of injuries

Electrostatic internal energy using the method of images

For several configurations of charges in the presence of conductors, the method of images permits us to obtain some observables associated with such a configuration by replacing the conductors with some image charges. However, simple inspection shows that the potential energy associated with both systems does not coincide. Nevertheless, it can be shown that for a system of a grounded or neutral conductor and a distribution of charges outside, the external potential energy associated with the real charge distribution embedded in the field generated by the set of image charges is twice the value of the internal potential energy associated with the original system. This assertion is valid for any size and shape of the conductor, and regardless of the configuration of images required. In addition, even in the case in which the conductor is not grounded nor neutral, it is still possible to calculate the internal potential energy of the original configuration through the method of images. These results show that the method of images could also be useful for calculations of the internal potential energy of the original system.Comment: 5 pages, 3 figures. New discussions added. Minor change

Stress engineering at the nanometer scale: Two-component adlayer stripes

Spontaneously formed equilibrium nanopatterns with long-range order are widely observed in a variety of systems, but their pronounced temperature dependence remains an impediment to maintain such patterns away from the temperature of formation. Here, we report on a highly ordered stress-induced stripe pattern in a two-component, Pd-O, adsorbate monolayer on W(110), produced at high temperature and identically preserved at lower temperatures. The pattern shows a tunable period (down to 16 nm) and orientation, as predicted by a continuum model theory along with the surface stress and its anisotropy found in our DFT calculations. The control over thermal fluctuations in the stripe formation process is based on the breaking/restoring of ergodicity in a high-density lattice gas with long-range interactions upon turning off/on particle exchange with a heat bath.Comment: 6 pages, 4 figure

Tradición e historia de la filosofía: la concepción cibernética de A. Robinet.

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El "sistema de psicología" de Ortega y Gasset.

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Combination of DROOL rules and Protégé knowledge bases in the ONTO-H annotation tool

ONTO-H is a semi-automatic collaborative tool for the semantic annotation of documents, built as a Protégé 3.0 tab plug-in. Among its multiple functionalities aimed at easing the document annotation process, ONTO-H uses a rule-based system to create cascading annotations out from a single drag and drop operation from a part of a document into an already existing concept or instance of the domain ontology being used for annotation. It also gives support to the detection of name conflicts and instance duplications in the creation of the annotations. The rule system runs on top of the open source rule engine DROOLS and is connected to the domain ontology used for annotation by means of an ad-hoc programmed Java proxy