Produção do serviço de transporte público urbano por ônibus: aspectos da organização do trabalho

O trabalho tem o objetivo de descrever e analisar a produção do serviço de transporte público urbano por ônibus, a partir da organização do trabalho nas empresas operadoras de Belo Horizonte, MG. No estudo identificaram-se os principais elementos que sobressaem na produção do serviço como o plano e as normas de trabalho, a divisão e sistematização das tarefas e do tempo do trabalhador, a carga e ritmos exigidos, as qualificações necessárias e a participação do trabalhador na programação do trabalho. As conclusões revelam que a organização do trabalho nas empresas pesquisadas se baseia fundamentalmente nas determinações do órgão gestor que regulamenta o setor

Equality of symmetrized tensors and the coordinate ring of the flag variety

In this note we give a transparent proof of a result of da Cruz and Dias da Silva on the equality of symmetrized decomposable tensors. This will be done by explaining that their result follows from the fact that the coordinate ring of a flag variety is a unique factorization domain.Comment: 5 page

Information retrieval in institutional repositories using the summarization technique derived from the selection of Cassiopeia attributes/ Recuperação de informação em repositórios institucionais utilizando a técnica de sumarização a partir da seleção de atributos do Cassiopeia

The large volume of available text documents arising from the increase in scientific output creates a need for researching and implementing methods that facilitate information search and retrieval in academic text bases, such as institutional repositories. This study’s objective is thus to analyze whether the application of the summarization technique, based on the method of selecting attributes (words) of the Cassiopeia model (implemented in the PragmaSUM summarizer), in academic texts, is helpful for retrieving information by reducing information overload and improving the accuracy of user search results. The research was developed in steps: elaboration of the reference collection; implementation of a search engine; execution of standard information retrieval; evaluation of information retrieval using the precision metric; and data analysis from Friedman ANOVA and Kendall’s Coefficient of Concordance statistical tests. Results revealed that summarization, mainly performed with high compression rates (80% and 90%), reduced information overload and increased the accuracy of the results presented to the user, allowing quality information retrieval in academic texts. Furthermore, it simplified the indexing process, attenuated high dimensionality and promoted faster information retrieval

Religiosidade tardo antiga e a cristianização do Império Romano

O IV século marca um momento decisivo tanto para o cristianismo e a Igreja cristão quanto para o Império Romano, pois verifica-se o processo de cristianização da  sociedade tardo antiga romana. Neste trabalho nosso objetivo é analisar esse fenômeno a partir do surgimento de uma nova religiosidade que cria as condições para o avanço do cristianismo e dos elementos internos da Igreja cristã que permitem a sua expansão neste novo ambiente religioso

Exact 1/N and Optimized Perturbative Evaluation of mu_c for Homogeneous Interacting Bose Gases

In the framework of the O(N) three-dimensional effective scalar field model for homogeneous dilute weakly interacting Bose gases we use the 1/N expansion to evaluate, within the large N limit, the parameter r_c which is directly related to the critical chemical potential mu_c. This quantity enters the order-a^2 n^{2/3} coefficient contributing to the critical temperature shift Delta T_c where a represents the s-wave scattering length and n represents the density. Compared to the recent precise numerical lattice simulation results, our calculation suggests that the large N approximation performs rather well even for the physical case N=2. We then calculate the same quantity but using different forms of the optimized perturbative (variational) method, showing that these produce excellent results both for the finite N and large-N cases.Comment: 12 pages, 2 figures. We have performed a refined and extended numerical analysis to take into account the very recent results of Ref. [15

Transition Temperature for Weakly Interacting Homogeneous Bose Gases

We apply the nonperturbative optimized linear δ expansion method to the O(N) scalar field model in three dimensions to determine the transition temperature of a dilute homogeneous Bose gas. Our results show that the shift of the transition temperature ΔTc/Tc of the interacting model, compared with the ideal-gas transition temperature, really behaves as γan1/3 where a is the s-wave scattering length and n is the number density. For N=2 our calculations yield the value γ=3.059