Spin exchange and superconductivity in a t−J′−Vt-J'-V model for two-dimensional quarter-filled systems

The effect of antiferromagnetic spin fluctuations on two-dimensional quarter-filled systems is studied theoretically. An effective $t-J'-V$ model on a square lattice which accounts for checkerboard charge fluctuations and next-nearest-neighbors antiferromagnetic spin fluctuations is considered. From calculations based on large-N theory on this model it is found that the exchange interaction, $J'$, increases the attraction between electrons in the d$_{xy}$ channel only, so that both charge and spin fluctuations work cooperatively to produce d$_{xy}$ pairing.Comment: 9 pages, 6 figure

Strategy of management of storage systems integrated with photovoltaic systems for mitigating the impact on LV distribution network

This article presents an integrated storage management strategy with photovoltaic systems connected to the grid, to provide voltage regulation and losses reduction in the low voltage feeder, minimising the power supplied by the network upstream of the main transformer. A new control algorithm for battery energy storage systems (BESS) is presented embedding as a battery management algorithm for charging and discharging process. The charging of the storage system is defined by the optimization of the αk coefficient to establish the value of charging threshold power, in a distributed manner, to maximise the use of photovoltaic systems. The discharging process occurs by a given σ coefficient. A standard network model from CIGRE was used for the validation of the management strategy. It was modified with real profiles of load and irradiance with a minute resolution to adapt it to the using of the quasi-static load flow in MATLAB/Simulink. As a result, by integrating 67% of PV along with 442 kWh of BESS with its management algorithm, power import from the grid decreases up to 49.3%.The authors would like to thank the University of the BasqueCountry and TECNALIA for supporting the work done at the Universityof the Basque Country under research grant by the Carolina Foundation

From theory to practice: professional experimentation in the course of graphic design

Da teoria à prática: a experimentação profissional no curso de design gráficoEste artigo relata um caso de aproximação de estudantes de design com o mercado de trabalho. Alunos do curso de graduação em design gráfico da Universidade Federal de Santa Catarina participaram de experimentação profissional na disciplina de Metodologia e Desenvolvimento de Projetos II, através do desenvolvimento de um projeto de programação visual para uma ação de reciclagem de óleo vegetal usado. A experiência foi fundamental para preparar os alunos para o mercado de trabalho, além de estimular para o bom aproveitamento da disciplina. Para a ação de reciclagem de óleo vegetal usado, os resultados alcançados mostraram-se tecnicamente adequados, superando expectativas

Critical analysis of a Musculoskeletal Disorders Prevention Program

Critical analysis of a Musculoskeletal Disorders Prevention ProgramThe studies involving the development of occupational diseases and accidents at work prevention programs have delimited two facts. One of them is that the program must be linked to the general organization politics. The other fact is that the diagnosis and the intervention about the organizational culture are necessary for the program to reach its goals. This research have aimed to evaluate an ergonomic intervention called Legislature Court, – Prevention of Musculoskeletal Disorders Program – developed, during one year, at the in Santa Catarina, compounded by 61 work environments. The demand have come from the institution direction, which have noticed the growing rise of Musculoskeletal Disorders. Thus, the direction have hired two professionals from the Ergonomics area (phychologist and physiotherapist) for contributing to the team organization which would be formed by the institutions´employess. The PMDP have initially aimed: to investigate the diseases demand and to evaluate the professionals, able to participate in the multidisciplinary team which would develop the PMDP. The program have gathered diagnosis strategies and interventions highlighted by ergonomics, work psychology and physiotherapy. The strategies were brought in two dimensions: the organizational and the individual. On the individual dimension there were performed physical activities on the work environment, followed by discussions about body conscious, in 14 place of the institution, visitations for understanding the work conditions, followed by discussions about the furniture adequacy and body posture; and three groups of preventive activities. On the organizational dimension it was planned for the multidisciplinary team to integrate the department in charge of the maintenance of the building and the health department. For the critical analysis of the program’s results, the data were collected by: : a) historical rescue of the PMDP; b) surveys with the employees who partipated in the multidisciplinary team; c) questionnaires in a stratified pre-sample of the activities´particpants. The critical analysis of the program´s results, can be initially understood, by the political aspect, due to the fact that the multidisciplinary team was built aiming the self-management, facing the human relations´ institutionalization, which permeates the politics adopted by the Intitution. However, the team didn´t reflect about the politics ´attitude and how it was against the whole organization politics. The team professional project was intervening on the Musculoskeletal Disorders prevention. This made them to be recognized as references on Ergonomics and Health. However, the team wasn´t recognized by the institution’s direction, who didn’t have a commitment with the PMDP. To conclude, the result’s criticism shows the comprehension a team must have about its own politics, about its organization politics and how it can determine a Musculoskeletal Disorders Prevention Program and its limits

Streaming Data Clustering in MOA using the Leader Algorithm

This master thesis presents a novel stream clustering algorithm, called StreamLeader. It presents a way to deliver clustering without the need of resorting to conventional clustering algorithms, like most other algorithms do. We test it, outperforming its state of the art rivals in most of the case

Los panteones reales del Monasterio de San Lorenzo de El Escorial. Muerte, sistemas sepulcrales y construcción de imagen dinástica, (1563-1833)

Estudio de la importancia histórica del panteón real y los demás espacios que configuran el monasterio de san Lorenzo de El Escorial, construido a iniciativa de Felipe II entre 1563 y 1584, como lugar de creación y proyección de imagen funeraria de la monarquía de España, durante la Edad Moderna, a partir de la mentalidad ante la muerte de los soberanos españoles, sus consortes y familiares, y el depósito de sus restos mortales en el mismo, cuya custodia era confiada a su comunidad jerónima