Sum-of-squares of polynomials approach to nonlinear stability of fluid flows: an example of application

With the goal of providing the first example of application of a recently proposed method, thus demonstrating its ability to give results in principle, global stability of a version of the rotating Couette flow is examined. The flow depends on the Reynolds number and a parameter characterising the magnitude of the Coriolis force. By converting the original Navier-Stokes equations to a finite-dimensional uncertain dynamical system using a partial Galerkin expansion, high-degree polynomial Lyapunov functionals were found by sum-of-squares-of-polynomials optimization. It is demonstrated that the proposed method allows obtaining the exact global stability limit for this flow in a range of values of the parameter characterising the Coriolis force. Outside this range a lower bound for the global stability limit was obtained, which is still better than the energy stability limit. In the course of the study several results meaningful in the context of the method used were also obtained. Overall, the results obtained demonstrate the applicability of the recently proposed approach to global stability of the fluid flows. To the best of our knowledge, it is the first case in which global stability of a fluid flow has been proved by a generic method for the value of a Reynolds number greater than that which could be achieved with the energy stability approach

Desenvolvimento urbano contemporâneo em cidades médias do interior paulista sob o estatuto da cidade: uma análise comparada de Piracicaba, Bauru e Rio Claro

O artigo traça um quadro do desenvolvimento urbano contemporâneo em cidades médias do interior do estado de São Paulo (Brasil), sob três dimensões complementares: econômica, urbanística e políticoinstitucional. Para tanto, indica os processos interdependentes que estruturam o desenvolvimento urbano com base na análise comparativa desses municípios (Piracicaba, Bauru e Rio Claro). Nesses termos, identifica como essas cidades se inseriram nos processos de transformação da economia nacional nas décadas de 1970-90, e como essa trajetória impactou suas dinâmicas urbano-regionais. Observa-se de que maneira as determinantes econômicas – tanto as vinculadas às mudanças no padrão locacional das indústrias quanto outras associadas à dinâmica imobiliária – impactaram o ordenamento urbanístico e como ocorreram tais processos decisórios. A análise se faz no contexto institucional da promulgação e vigência do Estatuto da Cidade, no qual os municípios refizeram seus Planos Diretores e passaram a contar com novos meios de regular a produção do espaço urbano.The article focuses on contemporary urban development in medium-sized cities in the state of São Paulo (Brazil), under three complementary dimensions: economic, urban and political-institutional. Thus, it indicates the interdependent processes that shape urban development based on comparative analysis of these municipalities (Piracicaba, Bauru and Rio Claro). In these terms it identifies how these cities were inserted in the processes of transformation of the national economy in the decades of 1970-90, and how that path impacted their urban-regional dynamics. We observe how the economic determinants – changes in the industry standard locational and dynamic real estate – impacted the urban planning and decision-making processes. The analysis is done in the context of institutional effectiveness and promulgation enactment of the Statute of the City, when municipalities remade their Master Plans and have acquired new ways to regulate the production of urban space.Peer Reviewe

Phenotypic heterogeneity of peripheral monocytes in healthy dogs

Monocytes are key cells of the innate immune system. Their phenotypic and functional roles have been investigated in humans, mice and other animals, such as the rat, pig and cow. To date, detailed phenotypic analysis of monocytes has not been undertaken in dogs. Two important surface markers in human monocytes are CD14 and MHC class II (MHC II). By flow cytometry, we demonstrated that canine monocytes can be subdivided into three separate populations: CD14posMHC IIneg, CD14posMHC IIpos and CD14negMHC IIpos. Both light and transmission electron microscopy confirmed the monocytic identity of all three populations. The CD14posMHC IIneg population could be distinguished on an ultrastructural level by their smaller size, the presence of more numerous, larger granules, and more pseudopodia than both of the other populations

Estoque de carbono e nutrientes na Serapilheira e solos de fragmentos florestais da Mata Atlântica do Estado Rio de Janeiro.

Esse trabalho objetiva contribuir para o entendimento da quantificação dos estoques de carbono da serapilheira em sistemas florestais do domínio da Mata Atlântica de duas regiões morfoclimáticas distintas do Estado do Rio de Janeiro. Trata-se de duas Microbacias Hidrográficas (MBH), respectivamente Santa Maria, em São José de Ubá, município situado na região Noroeste fluminense e Caixa d?água, situada no município de Trajano de Moraes, na região Serrana do Estado do Rio de Janeiro. Essas MBHs foram selecionadas no âmbito do Projeto RIO-RURAL, desenvolvidas pela Secretaria de Desenvolvimento Sustentável (SDS) da Secretaria de Agricultura e Pecuária do Estado do Rio de Janeiro (SEAPEC).bitstream/item/110806/1/ComTec-67-Estoque-Carbono.pd

Análise da estrutura populacional e determinação do fluxo gênico entre populações de arroz vermelho.

objetivo do trabalho foi caracterizar geneticamente populações de arroz vermelho do RS com suspeita de resistência aos herbicidas imidazolinonas e elucidar aspectos relacionados ao fluxo gênico de sementes entre diferentes locais

Spatial and temporal variability of the concentration field from localized releases in a regular building array

Spatial and temporal fluctuations in the concentration field from an ensemble of continuous point-source releases in a regular building array are analyzed from data generated by direct numerical simulations. The release is of a passive scalar under conditions of neutral stability. Results are related to the underlying flow structure by contrasting data for an imposed wind direction of 0 deg and 45 deg relative to the buildings. Furthermore, the effects of distance from the source and vicinity to the plume centreline on the spatial and temporal variability are documented. The general picture that emerges is that this particular geometry splits the flow domain into segments (e.g. “streets” and “intersections”) in each of which the air is, to a first approximation, well mixed. Notable exceptions to this general rule include regions close to the source, near the plume edge, and in unobstructed channels when the flow is aligned. In the oblique (45 deg) case the strongly three-dimensional nature of the flow enhances mixing of a scalar within the canopy leading to reduced temporal and spatial concentration fluctuations within the plume core. These fluctuations are in general larger for the parallel flow (0 deg) case, especially so in the long unobstructed channels. Due to the more complex flow structure in the canyon-type streets behind buildings, fluctuations are lower than in the open channels, though still substantially larger than for oblique flow. These results are relevant to the formulation of simple models for dispersion in urban areas and to the quantification of the uncertainties in their predictions