68,337 research outputs found
Simulation of Chua's Circuit by Means of Interval Analysis
The Chua's circuit is a paradigm for nonlinear scientific studies. It is
usually simulated by means of numerical methods under IEEE 754-2008 standard.
Although the error propagation problem is well known, little attention has been
given to the relationship between this error and inequalities presented in
Chua's circuit model. Taking the average of round mode towards and
, we showed a qualitative change on the dynamics of Chua's circuit.Comment: 6th International Conference on Nonlinear Science and Complexity -
S\~ao Jos\'e dos Campos, 2016, p. 1-
Vacuum fluctuations of a scalar field near a reflecting boundary and their effects on the motion of a test particle
The contribution from quantum vacuum fluctuations of a real massless scalar
field to the motion of a test particle that interacts with the field in the
presence of a perfectly reflecting flat boundary is here investigated. There is
no quantum induced dispersions on the motion of the particle when it is alone
in the empty space. However, when a reflecting wall is introduced, dispersions
occur with magnitude dependent on how fast the system evolves between the two
scenarios. A possible way of implementing this process would be by means of an
idealized sudden switching, for which the transition occurs instantaneously.
Although the sudden process is a simple and mathematically convenient
idealization it brings some divergences to the results, particularly at a time
corresponding to a round trip of a light signal between the particle and the
wall. It is shown that the use of smooth switching functions, besides
regularizing such divergences, enables us to better understand the behavior of
the quantum dispersions induced on the motion of the particle. Furthermore, the
action of modifying the vacuum state of the system leads to a change in the
particle energy that depends on how fast the transition between these states is
implemented. Possible implications of these results to the similar case of an
electric charge near a perfectly conducting wall are discussed.Comment: 17 pages, 8 figure
Gender differences in the workplace: the case of pharmaceutical industry in China
Gender’s equality is still an allusive phenomenon in twenty-first century workplaces. Previous studies have suggested that gendered assumptions and organizational factors may contribute to gender’s inequality. However, little research has investigated how individuals make sense of their roles in the workplace in the Chinese context. Drawing on cultural constructions of gender’s roles in organizations, we address three research questions: What are the meanings different actors ascribed to the sales occupation? To what extent are different actors able to (re)construct the dominant culture in the sales context? What are the implications of existing reproduction processes of the dominant culture for the way people experience their lives at the workplace? Through a discourse analysis this article examines the transcripts of thirty narratives on women in sale roles to critically analyse people attitudes to transform the dominant culture in working life. We argue that initiatives sponsored at different organizational ladders, and by both genders, are (un)consciously reproducing sales occupation’s masculine cultures in the pharmaceutical sales industry. The study reveals that while there is a discursive space within the salesforce for gender’s equality, in practice men and women at the workplace engage in masculine status quo, contributing to legitimize unequal relations between the genders in the sales industry in China.info:eu-repo/semantics/acceptedVersio
Diagnóstico da agricultura familiar no municÃpio de Moju, Pará.
bitstream/item/63291/1/Oriental-Doc104.pd
Riqueza de espécies, estrutura e composição florÃstica de uma floresta secundária de 40 anos no leste da Amazônia.
A perda de florestas naturais devido a pressões antrópicas levou as florestas secundárias a ocupar uma grande proporção de áreas no leste da Amazônia. Com o objetivo de conhecer as caracterÃsticas de uma comunidade arbórea e a estrutura populacional das espécies mais representativas, foram investigadas a riqueza de espécies, a estrutura e a composição florÃstica de uma floresta secundária de 40 anos no municÃpio de Bragança (01°11'S e 46°40'W), Estado do Pará, Brasil. A amostragem contou com todos os indivÃduos de espécies arbóreas (exceto Arecaceae) com DAP > 5 cm em 150 quadrados de 10×10 m. Foram registrados 2.934 indivÃduos em 154 espécies, 101 gêneros e 40 famÃlias. A densidade foi de 1.956,00 ± 643,45 ind ha-1 e a área basal de 17,358 ± 7,952 m2 ha-1 com um Ãndice de diversidade de Shannon de 4,030 nats. ind.-1. As espécies com a maior abundância de indivÃduos foram Myrcia bracteata, Casearia arborea e Maprounea guianensis. As com maior área basal foram Tapirira guianensis, Croton matourensis e Maprounea guianensis. A riqueza de espécies adaptou-se ao modelo de distribuição lognormal apenas para área basal e não para número de indivÃduos. Em 40 anos de sucessão, esta floresta mostra uma grande diversidade de espécies e baixa área basal
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