Floquet Fractional Chern Insulator in Doped Graphene

Fractional Chern insulators are theoretically predicted states of electronic matter with emergent topological order. They exhibit the same universal properties as the fractional quantum Hall effect, but dispose of the need to apply a strong magnetic field. However, despite intense theoretical work, an experimental realization for these exotic states of matter is still lacking. Here we show that doped graphene turns into a fractional Chern insulator, when irradiated with high-intensity circularly polarized light. We derive the effective steady state band structure of light-driven graphene using Floquet theory and subsequently study the interacting system with exact numerical diagonalization. The fractional Chern insulator state equivalent to the 1/3 Laughlin state appears at 7/12 total filling of the honeycomb lattice (1/6 filling of the upper band). The state also features spontaneous ferromagnetism and is thus an example of the spontaneous breaking of a continuous symmetry along with a topological phase transition.Comment: 10 page

Alberto Sánchez: un dibujo inédito y extracto de una conferencia

The sculptor Alberto Sánchez (1895-1962), one of the most important figures in the Spanish historical vanguard, goes through a crisis during the previous years to the civil war and he practically renounces to the tridimensional creation that he had developed between 1925 and 1932. At the end of this last year he gives a lecture at the "Ateneo de Madrid" where he exposes the basis of an unrealizable poetics faced with the Spanish historical moment. Shortly afterwards, in spite of the political and ideological pressures, Alberto makes an important bi-dimensional work, unpublished until now, for whom political duty and individual creation were unavoidable and (occasionally) irreconcilable terms.El escultor Alberto Sánchez (1895-1962), una de las principales figuras de la vanguardia histórica española, atraviesa durante los años previos a la guerra civil una crisis que provoca el práctico abandono de la creación tridimensional sostenida entre 1925 y 1932. A finales de este último año imparte una conferencia en el Ateneo de Madrid en la que plantea las razones de este "alejamiento" y expone los fundamentos de una poética irrealizable ante la difícil coyuntura histórica que atraviesa el país. Poco tiempo después, y pese a las presiones políticas e ideológicas a las que se ve sometido, Alberto realiza una importante obra bidimensional, hasta el momento inédita, que permite profundizar en las contradicciones de un artista para el que compromiso político y creación individual eran términos ineludibles y (en ocasiones) irreconciliables

El juego de las políticas públicas: Reglas y decisiones sociales

El Juego de las políticas públicas -- Reglas y decisiones sociales es un libro que se deja leer con facilidad y sus propuestas conceptuales son un buen punto de partida para generar discusiones y cerrar otras, para articular discursos, para proponer metodologías de análisis, de ahí su valía teórica -- Constituye un paso en la dirección correcta para enriquecer el análisis de políticas públicas, en un país como Colombia donde se habla del tema con extrema flexibilidad, y donde los conceptos construidos en otras latitudes no se adaptan a nuestras realidades institucionales y culturales -- Ese esfuerzo de adaptación es un valor agregado de la obra1. Políticas públicas - 27 2. Instituciones y análisis de políticas públicas - 43 3. Contexto para la decisión social - 75 4. La apuesta predecisional - 97 5. Dimensión democrática -115 6. Coordinación - 131 7. Accountability y control social - 143 Algunos autores referenciados - 169 Bibliografía - 171p. 18

Customer-oriented risk assessment in Network Utilities

For companies that distribute services such as telecommunications, water, energy, gas, etc., quality perceived by the customers has a strong impact on the fulfillment of financial goals, positively increasing the demand and negatively increasing the risk of customer churn (loss of customers). Failures by these companies may cause customer affection in a massive way, augmenting the intention to leave the company. Therefore, maintenance performance and specifically service reliability has a strong influence on financial goals. This paper proposes a methodology to evaluate the contribution of the maintenance department in economic terms, based on service unreliability by network failures. The developed methodology aims to provide an analysis of failures to facilitate decision making about maintenance (preventive/predictive and corrective) costs versus negative impacts in end-customer invoicing based on the probability of losing customers. Survival analysis of recurrent failures with the General Renewal Process distribution is used for this novel purpose with the intention to be applied as a standard procedure to calculate the expected maintenance financial impact, for a given period of time. Also, geographical areas of coverage are distinguished, enabling the comparison of different technical or management alternatives. Two case studies in a telecommunications services company are presented in order to illustrate the applicability of the methodology

Diseño de un plan de mantenimiento preventivo (LEM) y software de administración para los equipos de las súper tiendas y Droguerías Olímpica S.A. en el Eje Cafetero

Este trabajo de grado se realiza con el fin de diseñar un plan de mantenimiento tipo LEM (Lubricación electricidad mecánica) para la empresa supertienda Olimpica S.A. ubicada en la ciudad de Pereira (Risaralda), el objetivo es entregar un recurso con el cual esta compañía pueda hacer seguimiento a todos sus equipos utilizando un software en el cual se puede encontrar empadronamiento de equipos, expedientes, historial de los equipos por medio de las hojas de vida y notas de seguridad, instructivos de mantenimiento para la programación de los tableros de control y software para manejo. Dicho plan de mantenimiento se hace de acuerdo a las necesidades de la empresa, en el cual se entrega como resultado una documentación que ayude a la compañía para hacer una mejora en los procesos mediante la información que se logré captar con este trabajo. Se encontrarán algunos anexos entre ellos los expedientes, las tarjetas maestras, las hojas de vida, las notas de seguridad, los tableros de control que acompañados de la relación de requerimientos son la base para la programación de los mantenimientos; también se menciona la visión, misión e historia de la compañía Olimpica S.A. Durante este proceso hubo toda la disponibilidad de la empresa Olimpica S.A, el Ingeniero Alexander Cuesta jefe de mantenimiento, y los estudiantes involucrados en esta tarea

Failure mode prediction and energy forecasting of PV plants to assist dynamic maintenance tasks by ANN based models

In the field of renewable energy, reliability analysis techniques combining the operating time of the system with the observation of operational and environmental conditions, are gaining importance over time. In this paper, reliability models are adapted to incorporate monitoring data on operating assets, as well as information on their environmental conditions, in their calculations. To that end, a logical decision tool based on two artificial neural networks models is presented. This tool allows updating assets reliability analysis according to changes in operational and/or environmental conditions. The proposed tool could easily be automated within a supervisory control and data acquisition system, where reference values and corresponding warnings and alarms could be now dynamically generated using the tool. Thanks to this capability, on-line diagnosis and/or potential asset degradation prediction can be certainly improved. Reliability models in the tool presented are developed according to the available amount of failure data and are used for early detection of degradation in energy production due to power inverter and solar trackers functional failures. Another capability of the tool presented in the paper is to assess the economic risk associated with the system under existing conditions and for a certain period of time. This information can then also be used to trigger preventive maintenance activities

Analysis of the impact of the Asset Health Index in a Maintenance Strategy

Hosted by the Johannes Kepler University, Linz, Austria. May 23-24, 2019 - European Safety, Reliability & Data Association (ESReDA)During many years, asset management methodologies used in industry were focused on knowing and analysing the operational control of the daily work and the impact of the maintenance on the availability. Later, the costs turn into the priority, and strategies were focused on assesses a longer lifecycle and optimizing processes and contracts. Finally, recent normative have included concepts as “knowing and managing the risks” and the target is to prioritize the maintenance tasks to the critical assets. However, taking a balanced asset management model for the operational environment, quite a lot of facilities of Oil & Gas sector are reaching the end of their initially estimated lifecycle. New challenges are related to extend the life of the main items of the facilities or at least, to find the optimal replacement moment that guarantees that the maintenance strategy is being optimized. Asset Health Index methodology considers a theoretical lifecycle of an item, in which depending on the proximity to the end of the useful life, the probability of failure increases. But take this theoretical lifecycle as a base, different operation location factors or O&M aspects can modify this period. All these factor are quantified and permit us to calculate a new theoretical profile. This paper is about assess the impact of the AHI into the maintenance strategy optimisation. AHI enables us to compare future alternative cost profiles and assess the impact in the failure probability of the item. As a result, we are able to know the risk that is taken when we enlarge the operation of an item, and the impact in the operational costs

The activism of ABC and El Debate vis-à-vis education in the second república

El presente trabajo analiza la acción social desarrollada por los diarios católicos Abc y El Debate durante la II República española a propósito de las reformas aprobadas en el campo de la enseñanza. Para ello, se analizan las estrategias de enmarcado dominantes a partir del examen de 355 documentos, publicados entre 1931 y 1933. Los resultados muestran que el discurso de estos periódicos buscó promover la movilización social.This paper analyzes the social action developed by the Catholic newspapers Abc and El Debate during the Second Republic with regard to the reforms adopted in the field of education. With this aim, we analyze the dominant framing strategies by means of the examination of 355 articles, published between 1931 and 1933. The results show that the discourse of these newspapers sought to promote social mobilization

On the role of Prognostics and Health Management in advanced maintenance systems

The advanced use of the Information and Communication Technologies is evolving the way that systems are managed and maintained. A great number of techniques and methods have emerged in the light of these advances allowing to have an accurate and knowledge about the systems’ condition evolution and remaining useful life. The advances are recognized as outcomes of an innovative discipline, nowadays discussed under the term of Prognostics and Health Management (PHM). In order to analyze how maintenance will change by using PHM, a conceptual model is proposed built upon three views. The model highlights: (i) how PHM may impact the definition of maintenance policies; (ii) how PHM fits within the Condition Based Maintenance (CBM) and (iii) how PHM can be integrated into Reliability Centered Maintenance (RCM) programs. The conceptual model is the research finding of this review note and helps to discuss the role of PHM in advanced maintenance systems.EU Framework Programme Horizon 2020, 645733 - Sustain-Owner - H2020-MSCA-RISE-201