Infrared Maximally Abelian Gauge

The confinement scenario in Maximally Abelian gauge (MAG) is based on the concepts of Abelian dominance and of dual superconductivity. Recently, several groups pointed out the possible existence in MAG of ghost and gluon condensates with mass dimension 2, which in turn should influence the infrared behavior of ghost and gluon propagators. We present preliminary results for the first lattice numerical study of the ghost propagator and of ghost condensation for pure SU(2) theory in the MAG.Comment: 3 pages, 4 figures; work presented at QCHS7 in Ponta Delgada (PT) Sept 2-7, 200

Brief Incursion into Bankruptcy and the Enforcement of Creditor\u27s Rights in Brazil

This article is an overview of bankruptcy law and concerns in Brazil, as well as a exploration of what rights creditors have in bankruptcy

Brief Incursion into Bankruptcy and the Enforcement of Creditor\u27s Rights in Brazil

This article is an overview of bankruptcy law and concerns in Brazil, as well as a exploration of what rights creditors have in bankruptcy

EDUCATION IN ORAL HEALTH: A Reflective Approach for Quality of Life.

This work aims at critical reflection on the actions that determine a good level of oral health. Health promotion is a process that can positively affect the quality of life of a population. Dental problems have a low priority compared to diseases considered to be of social relevance. Prevention of oral diseases must be developed at three levels: primary, secondary and tertiary. Self-diagnosis is extremely important, because the sooner the problem is detected and prevention services are activated, the greater the chances of an effective treatment. Among oral health problems, dental caries is considered a damage that deserves higher priority due to its high prevalence. Oral cancer gained the second degree of priority, due to its severity, followed by periodontal diseases. Education in oral health has been increasingly required, taking into account the low cost and the possibilities of dental impact on public health. Therefore, the role of educating should not be the exclusive responsibility of the professional conventionally called teacher, but of any citizen.This work aims at critical reflection on the actions that determine a good level of oral health. Health promotion is a process that can positively affect the quality of life of a population. Dental problems have a low priority compared to diseases considered to be of social relevance. Prevention of oral diseases must be developed at three levels: primary, secondary and tertiary. Self-diagnosis is extremely important, because the sooner the problem is detected and prevention services are activated, the greater the chances of an effective treatment. Among oral health problems, dental caries is considered a damage that deserves higher priority due to its high prevalence. Oral cancer gained the second degree of priority, due to its severity, followed by periodontal diseases. Education in oral health has been increasingly required, taking into account the low cost and the possibilities of dental impact on public health. Therefore, the role of educating should not be the exclusive responsibility of the professional conventionally called teacher, but of any citizen

Embedment of metal nanoparticles in GaAs and Si for plasmonic absorption enhancement in intermediate band solar cells

The high near-field enhancement occurring in the vicinity of metallic nanoparticles (MNPs) sustaining surface plasmons can only be fully exploited in photovoltaic devices if the MNPs are placed inside their semiconducting material, in the photoactive region. In this work an experimental procedure is studied to embed MNPs in gallium arsenide (GaAs) and silicon (Si), which can be applied to other semiconductor host materials. The approach consists in spin-coating colloidal MNPs dispersed in solution onto the substrate surface. Then a capping layer of the same material as the substrate is deposited on top to embed the MNPs in the semiconductor. The extinction spectra of silver (Ag) and gold (Au) MNPs embedded in GaAs and Si is modeled with Mie theory for comparison with optical measurements. This contribution constitutes the initial step towards the realization of quantum-dot intermediate band solar cells (QD-IBSC) with MN

Growth patterns and scaling laws governing AIDS epidemic in Brazilian cities

Brazil holds approximately 1/3 of population living infected with AIDS (acquired immunodeficiency syndrome) in Central and South Americas, and it was also the first developing country to implement a large-scale control and intervention program against AIDS epidemic. In this scenario, we investigate the temporal evolution and current status of the AIDS epidemic in Brazil. Specifically, we analyze records of annual absolute frequency of cases for more than 5000 cities for the first 33 years of the infection in Brazil. We found that (i) the annual absolute frequencies exhibit a logistic-type growth with an exponential regime in the first few years of the AIDS spreading; (ii) the actual reproduction number decaying as a power law; (iii) the distribution of the annual absolute frequencies among cities decays with a power law behavior; (iv) the annual absolute frequencies and the number of inhabitants have an allometric relationship; (v) the temporal evolution of the annual absolute frequencies have different profile depending on the average annual absolute frequencies in the cities. These findings yield a general quantitative description of the AIDS infection dynamics in Brazil since the beginning. They also provide clues about the effectiveness of treatment and control programs against the infection, that has had a different impact depending on the number of inhabitants of cities. In this framework, our results give insights into the overall dynamics of AIDS epidemic, which may contribute to select empirically accurate models.Comment: 12 pages, 6 figure

Mobilizing histories in mathematics teacher education: memories, social practices, and discursive games

Disponível em: http://link.springer.com/article/10.1007/s11858-010-0255-8In the first part of this paper, we share and elucidate the way we mobilize histories in some disciplines that are part of the undergraduate courses in mathematics teacher education offered by State University of Campinas and Federal University of Rio Grande do Norte in Brazil. This way of mobilization can be featured as a set of collective indisciplinary problematizations occurring in a series of student investigations. Mobilizing practices of mathematics culture are the object of these investigations. These practices are performed by different communities both constituted by and constituent of different human activities. In the second part of this paper, we will discuss our way of mobilizing histories, contrasting it with the theoretical perspective of expansive learning, just as it has been defended by Yrjö Engeström, in his article Non scolae sed vitae discimus—towards overcoming the encapsulation of school learning. We will also attempt to highlight the role which this researcher has attributed to history in his model of expansive learning, a perspective based on the current research on activity theory