Integral equations of scattering in one dimension

A self-contained discussion of integral equations of scattering is presented in the case of centrally symmetric potentials in one dimension, which will facilitate the understanding of more complex scattering integral equations in two and three dimensions. The present discussion illustrates in a simple fashion the concept of partial-wave decomposition, Green's function, Lippmann-Schwinger integral equations of scattering for wave function and transition operator, optical theorem, and unitarity relation. We illustrate the present approach with a Dirac delta potential. (C) 2001 American Association of Physics Teachers.

Collective Perspective on Advances in Dyson-Schwinger Equation QCD

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Complexos fosfínicos e suas aplicações na medicina

Phosphines are well known to chemists. The ligands themselves are widely used in organic synthesis (e.g. The Wittig reaction) and transition metal phosphine complexes have been studied extensively primarily for their applications as hydrogenation catalysts (e.g. Wilkinson's catalyst). In this article attention is focused on the biological properties of phosphines and metal phosphine complexes since the triethylphosphine Au(I) complex, auranofin, has been used as antiarthritic drug for clinical use. This fact has provided a stimulus for exploration of the biological chemistry of phosphines and their metal complexes. Metal phosphine complexes also offer potential as heart-imaging agents and anticancer drugs.

Mirmecofauna em um fragmento de floresta atlântica urbana no município de Marília, Brasil

The aim of this study was to verify the influence of the habitat fragmentation on the Ant Fauna in an urban fragment of Semideciduous Seasonal Atlantic Forest located in the municipality of Marilia, São Paulo, Brazil. The studied fragment was divided into three environments in relation to edge: "Edge" (2m), "Transition" (30m) and "Interior" (90m). By using pitfalls traps and attractive baits there were done nine samples between November 2007 and February 2008. There were collected 3.873 individuals distributed into five subfamilies, 19 genera and 33 species. Five species were abundant on three studied environments: Ectatomma sp1, Mycocepurus goeldii, Paratrechina sp1, Pheidole sp2, Trachymyrmex sp1, Wasmannia auropunctata. The edge and transition environments presented the lower Simpsons diversity index and higher species dominance. However, it was observed little variation between these parameters between environments. Faunistic similarity between environments, expressed by Jaccard's similarity index showed high similarity between all studied environments. Because the studied site is an urban fragment, the similarity found between these areas can be related to habitat fragmentation process, an historical of constant anthropic perturbation and low local colonization rates. However, we suggest that a posteriori evaluation should be done with other arthropods groups like spiders and beetles in due to understand the changes that occur in urban fragments and support the choice of conservation and management actions in favor of this important forest remnant localized in urban area of Marilia, São Paulo, Brazil.

Influência da irrigação, da densidade de plantio e da adubação nitrogenada nas características morfogênicas, estruturais e de produção do capim-tanzânia

This experiment was carried out to evaluate canopy height of guinea grass with 95% of photosynthetic active radiation interception and quantify the nitrogen fertilization influence and plants' density on the morphogenesis and structural characteristics of Tanzania grass. Four doses of N (0, 80, 160 e 320 kg.ha -1), were arranged with three plant densities (9, 25 and 49 plants.m -2), according to 4 × 3 completely randomized design, with three repetitions. Total dry matter (DM) accumulation throughout the experimental period was influenced by nitrogen fertilization and plants' density. In the rainy period, the higher nitrogen fertilization decreased the harvesting intervals, and consequently, increased the number of harvests. The rate of leaf appearance and the phyllochron were influenced only under nitrogen fertilization in the transition period of rainy and dry weather. Tanzania grass canopy height under 95% of light interception was positively influenced because of the plant densities in rainy period and transition period between rainy/drought and drought. Tanzania grass height under 95% of light interception presented variations along the evaluations and the values were higher (near 70 cm) in the rainy period, followed by transition period rain/drought and drought. © 2011 Sociedade Brasileira de Zootecnia.

Poços quânticos e transferência de elétrons

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Entre o semear e a próxima colheita: uma análise dos escritos de Lenin sobre a questão agrário-camponesa

Pós-graduação em Ciências Sociais - FFC

Bignoniáceas de dezoito fragmentos florestais remanescentes no noroeste paulista, Brasil

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

A educação especial do novo homem soviético e a psicologia de L. S. Vigotski: implicações e contribuições para a psicologia e a educação atuais

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Conchostráceos permianos da bacia do Paraná: taxonomia, evolução, bioestratigrafia e paleobiogeografia

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Como Esaú e Jacó: as oligarquias sul-mineiras no final do Império e Primeira República

Pós-graduação em História - FCHS

Análise morfológica de pites em aços inoxidáveis austeníticos ABNT 304 e 310S submetido à nèvoa salina

Pós-graduação em Engenharia Mecânica - FEG

Estratégias de exploração dos recursos florais pelas abelhas (Hymenoptera: Apiformes) em uma comunidade vegetal em regeneração

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Helena Antipoff – A educadora ruralista: a construção de um acervo pessoal sua relevância para a educação na atualidade

Este artigo propõe-se a refletir como as trajetórias pessoal e profissional de Helena Antipoff (1892-1974), aliadas às suas convicções de que a intervenção e transformação do real decorrem do conhecimento acumulado, da experiência e do desejo de ampliar o bem comum são elementos que vão construindo acervos pessoais, a partir dessa triangulação. Esta construção se funda mais nas práticas e ações do que na intenção de elaborar um acervo, mas termina por compor a construção de uma memória, articulada à formação do “Centro de Documentação e Pesquisa Helena Antipoff” – Ibirité-MG. Nascida na Rússia e tendo vivido no Brasil no período de 1929-1974, a educadora destacou-se por ações socialmente relevantes fundadas na organização do estudo e da pesquisa nos campos da psicologia, da educação e da educação rural, sendo estas duas últimas objetos de nossa pesquisa documental e análises.

White light generation in Tm3+/Ho3+/Yb3+ doped PbO-GeO2 glasses excited at 980 nm

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)