Rio de Janeiro State University

About: Rio de Janeiro State University is a education organization based out in Rio de Janeiro, Brazil. It is known for research contribution in the topics: Population & Large Hadron Collider. The organization has 16631 authors who have published 30919 publications receiving 465753 citations. The organization is also known as: UERJ & Rio de Janeiro State University.

Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at sqrt(s) = 8 TeV

Abstract: A search is reported for massive resonances decaying into a quark and a vector boson (W or Z), or two vector bosons (WW, WZ, or ZZ). The analysis is performed on an inclusive sample of multijet events corresponding to an integrated luminosity of 19.7 inverse femtobarns, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. The search uses novel jet-substructure identification techniques that provide sensitivity to the presence of highly boosted vector bosons decaying into a pair of quarks. Exclusion limits are set at a confidence level of 95% on the production of: (i) excited quark resonances q* decaying to qW and qZ for masses less than 3.2 TeV and 2.9 TeV, respectively, (ii) a Randall-Sundrum graviton G[RS] decaying into WW for masses below 1.2 TeV, and (iii) a heavy partner of the W boson W' decaying into WZ for masses less than 1.7 TeV. For the first time mass limits are set on W' to WZ and G[RS] to WW in the all-jets final state. The mass limits on q* to qW, q* to qZ, W' to WZ, G[RS] to WW are the most stringent to date. A model with a "bulk" graviton G[Bulk] that decays into WW or ZZ bosons is also studied.

Relevant factors for tacit knowledge transfer within organisations

Abstract: Purpose – This paper aims to identify the pertinent factors for tacit knowledge transfer within a major state‐owned Brazilian oil company – Petrobras.Design/methodology/approach – The research analyses the literature concerning tacit knowledge transfer within organisations and, using a quantitative approach based on exploratory factorial analysis, seeks to collect facts in order to identify relevant factors for tacit knowledge transfer within the organisation in question.Findings – It is seen that idiosyncratic factors, the knowledge management strategy adopted by the company, and its organisational structure are relevant elements for the success of tacit knowledge transfer within the organisation.Research limitations/implications – The study was conducted just in the Sales and Marketing division of Petrobras. Therefore, its external validity cannot be tested and any attempt to make a statistical generalisation would be flawed. Another limitation is related to the acuity of perception of the employees inv...

Shearing expansion-free spherical anisotropic fluid evolution

Abstract: Spherically symmetric expansion-free distributions are systematically studied. The entire set of field equations and junction conditions are presented for a general distribution of dissipative anisotropic fluid (principal stresses unequal), and the expansion-free condition is integrated. In order to understand the physical meaning of expansion-free motion, two different definitions for the radial velocity of a fluid element are discussed. It is shown that the appearance of a cavity is inevitable in the expansion-free evolution. The nondissipative case is considered in detail, and the Skripkin model is recovered.

Incapacidade funcional entre as mulheres idosas no Brasil

Abstract: OBJETIVO: Estimar as taxas de incapacidade funcional e identificar os fatores sociodemograficos associados com a prevalencia de incapacidade funcional entre as mulheres idosas. METODOS: As estimativas das taxas de incapacidade funcional foram produzidas com informacoes da Pesquisa Nacional por Amostra de Domicilios, de 1998, realizada pelo Instituto Brasileiro de Geografia e Estatistica. O estudo analisou a populacao de mulheres idosas, num total de 16.186. Foram elaborados modelos de regressao logistica, utilizando como variavel dependente a dificuldade para caminhar 100 metros. RESULTADOS: A prevalencia de incapacidade funcional leve, moderada e severa foi maior entre as mulheres, e aumentou com a idade. Na analise de regressao logistica, os indicadores mais fortemente associados com o aumento da prevalencia de incapacidade funcional foram baixo nivel de educacao e baixo rendimento familiar. Residencia rural foi tambem associada com reducao de prevalencia. CONCLUSOES: Os resultados sugerem possiveis fatores de risco para o desenvolvimento de declinio funcional em idosas, tendo em vista que as associacoes encontradas foram consistentes com aquelas reportadas por outros estudos.