Non-Chern-Simons Topological Mass Generation in (2+1) Dimensions

By dimensional reduction of a massive BF theory, a new topological field theory is constructed in (2+1) dimensions. Two different topological terms, one involving a scalar and a Kalb-Ramond fields and another one equivalent to the four-dimensional BF term, are present. We constructed two actions with these topological terms and show that a topological mass generation mechanism can be implemented. Using the non-Chern-Simons topological term, an action is proposed leading to a classical duality relation between Klein-Gordon and Maxwell actions. We also have shown that an action in (2+1) dimensions with the Kalb-Ramond field is related by Buscher's duality transformation to a massive gauge-invariant Stuckelberg-type theory.Comment: 8 pages, no figures, RevTE

Four-dimensional topological Einstein-Maxwell gravity

The complete on-shell action of topological Einstein-Maxwell gravity in four-dimensions is presented. It is shown explicitly how this theory for SU(2) holonomy manifolds arises from four-dimensional Euclidean N=2 supergravity. The twisted local BRST symmetries and twisted local Lorentz symmetries are given and the action and stress tensor are shown to be BRST-exact. A set of BRST-invariant topological operators is given. The vector and antisymmetric tensor twisted supersymmetries and their algebra are also found.Comment: Published version. Expanded discussion of new results in the introduction and some clarifying remarks added in later sections. 22 pages, uses phyzz

Extended excitons and compact heliumlike biexcitons in type-II quantum dots.

We have used magneto-photoluminescence measurements to establish that InP/GaAs quantum dots have a type-II band (staggered) alignment. The average excitonic Bohr radius and the binding energy are estimated to be 15 nm and 1.5 meV respectively. When compared to bulk InP, the excitonic binding is weaker due to the repulsive (type-II) potential at the hetero-interface. The measurements are extended to over almost six orders of magnitude of laser excitation powers and to magnetic fields of up to 50 tesla. It is shown that the excitation power can be used to tune the average hole occupancy of the quantum dots, and hence the strength of the electron-hole binding. The diamagnetic shift coe±cient is observed to drastically reduce as the quantum dot ensemble makes a gradual transition from a regime where the emission is from (hydrogen-like) two-particle excitonic states to a regime where the emission from (helium-like) four-particle biexcitonic states also become significant

Recomendações técnicas para criação de cabras leiteiras.

Raças indicadas; Parda Alpina; Toggenburg; Saanen; Anglo-Nubiana;Manejo reprodutivo; Seleção de Reprodutores; Seleção de Matrizes; Puberdade e Maturidade Sexual; Ciclo Estral e Estro; Rufião; Sistema de Acasalamento; Período de Gestação; Cuidados Durante a Gestação; Parto; Manejo das crias; Mamada do Colostro; Tratamento do Umbigo; Identificação; Permanência da Cria com a Mãe; Aleitamento Artificial; Descorna; Desmame e Separação por Sexo; Castração; Alimentação e nutrição; Pastagem Cultivada; Manejo de Utilização de Capineira de Capim Elefante; Irrigação; Formas de Utilização do Capim; Suplementação Alimentar; Banco de Proteína; Leucena (Leucaena leucocephala); Feijão Guandu (Cajanus cajan); Cunhã (Clitoria ternatea L.); Suplementação Mineral; Exigências Nutricionais de Cabras Leiteiras; Manejo sanitário; Endoparasitoses; Helmintoses (verminose gastrintestinal); Eimeriose (coccidiose); Ectoparasitoses; Pediculose (piolho); Miíase (bicheira); Sarnas; Doenças Causadas por Bactérias; Mamite (mastite); Linfadenite caseosa (mal do caroço); Ceratoconjuntivite infecciosa (oftalmia contagiosa); Pododermatite (frieira ou mal do casco); Micoplasmose; Doenças Causadas por Vírus; Ectima contagioso (boqueira); Artrite-encefalite caprina viral (CAEV); Doenças Metabólicas e Carenciais; Urolitíase obstrutiva (cálculo urinário); Toxemia da gestação (acetonemia ou hipoglicemia); Instalações; Aprisco e Chiqueiro; Currais de manejo; Pedilúvio; Cochos para Sal Mineral (Saleiro); Cercas; Área de Isolamento.bitstream/item/35660/1/CIT25.pd

Characterizing Brazilian climate zones for up-scaling the simulated crop yield potential.

ABSTRACT: Crop models are written as sets of different equations which are solved numerically. They require time series of local environmental drivers like weather conditions and constant parameters that determine sensitivity of processes to both crop state and environment. There is a hamper on the model upscaling from point to region, and the quantification of model output uncertainity at the regional scale. This paper aimed to perform a conceptual analysis of the Brazilian climate zones based on long-term uniform weather data series (air temperature, soil water deficit, rainfall and global solar radiation), were each climatic variable were spatially organized and the maps for each one were generated by a kriging interpolation. The proposed zonation seems coherent with the agroecologycal conditions observed around Brazil, and based on the biomes, there is an agreement with the main Brazilian potential vegetation types and even with the cropping systems spatial distributions. The final map might be used for ?bottom-up? upscaling approach in order to extrapolate the location specific data to a broader scale. Further work should focus in the inclusion of soil data to reach a robust zone map to support crop model outputs up-scaling, as well as in the zones validation.CBA 2013, RLAA 2013

Sociospatial reading of favela: A comparative analysis from organic Portuguese cities

This research decodifies the favelas spatial system through its configuration in com- parison to historical organic structures aiming at searching similar self-organized processes. It is intended to observe in which way the configuration of such areas, read through their spatial patterns, affects their sociospatial dynamics and how it gets closer to common strategies for organizing the urban space: in which way favela reproduces historically consolidated spatial patterns inherent to organic cities? The Theory of The Social Logic of Space (Hillier & Han- son, 1984) is the theoretical, methodological and technical approach for this study, allowing to investigate such phenomena by means of its spatial complexity. The sample consists of 120 set- tlements around the world, explored according to a set of 26 configurational variables (among qualitative and quantitative, both geometric and topological), compared to a group of 45 Por- tuguese medieval towns (representative of organic cities). Findings show that the favelas recog- nized spatial patterns are mostly common to those associated with organic structures. Despite being much denser and apparently labyrinthine shapes, the internal dynamics of the favelas reveal positive global relationships. These settlements behave similarly to consolidated urban systems and share common spatial logics throughout world regions and distinct cultures, fea- ture which allows recognizing the self-organization strategy as essential to their structural and survival process.info:eu-repo/semantics/publishedVersio

Efeito da população de plantas e do espaçamento sobre a produtividade de milho.

Para avaliar o efeito da população de plantas (30.000, 60.000 e 90.000 plantas ha-1), sob dois espaçamentos (0,40 e 0,80 m), sobre o rendimento de grãos de três genótipos de milho com arquiteturas foliares aberta (AG 1O51), semi-ereta (AG 7575) e ereta (DKB 911), foi conduzido um experimento em Piracicaba-SP, no período de 20 de novembro de 2000 a lO de abril de 2001. Pôde-se concluir que: a) na maior população, a redução do espaçamento de 0,80 m para 0,40 m teve efeito positivo no rendimento de grãos no genótipo de arquitetura foliar aberta; b) até 60.000 plantas ha-1, independentemente do genótipo, o rendimento de grãos é crescente com o aumento da população de plantas. Com o aumento da população de plantas de 60.000 para 90.000 plantas ha-1, o rendimento de grãos: a) aumenta no genótipo de arquitetura foliar ereta; b) estabiliza-se, no genótipo de arquitetura semi-ereta; c) estabiliza-se, sob o menor espaçamento, ou diminui sob espaçamento de 0,80 m, no genótipo de arquitetura aberta