Integrable deformations of strings on symmetric spaces

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

On two-current realization of KP hierarchy

A simple description of the KP hierarchy and its multi-hamiltonian structure is given in terms of two Bose currents. A deformation scheme connecting various W-infinity algebras and the relation between two fundamental nonlinear structures are discussed. Properties of Faá di Bruno polynomials are extensively explored in this construction. Applications of our method are given for the Conformal Affine Toda model, WZNW models and discrete KP approach to Toda lattice chain.

Flattening of the resonance spectrum of hadrons from κ-deformed Poincaré algebra

Recently Lukierski et al. [1] defined a κ-deformed Poincaré algebra which is characterized by having the energy-momentum and angular momentum sub-algebras not deformed. Further Biedenharn et al. [2] showed that on gauging the κ-deformed electron with the electromagnetic field, one can set a limit on the allowed value of the deformation parameter ∈ ≡ 1/κ < 1 fm. We show that one gets Regge like angular excitations, J, of the mesons, non-strange and strange baryons, with a value of ∈ ∼ 0.082 fm and predict a flattening with J of the corresponding trajectories. The Regge fit improves on including deformation, particularly for the baryon spectrum.

Aplicações de ágebra linear aos códigos corretos de erros e ao ensino médio

Pós-graduação em Matemática em Rede Nacional - IBILCE

Boas práticas de manejo de bezerras leiteiras na fase de cria e potenciais efeitos na recria

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Poluentes orgânicos persistentes em ar interior: desenvolvimento de método de extração em adsorvente para amostragem ativa

Persistent Organic Pollutants (POPs) are chemical substances extraordinarily toxic and persistent in the environment. Due to these properties, POPs are targets of the Stockholm Convention which aims to provide means to eliminate production and use by encouraging the reduction and, where possible, eliminating the release of these contaminants to the environment. One of the articles of this _Convention aims to assess the basal levels of such substances in the environment to monitor both the reduction of release to the environment, and to assess human exposure, using analyzes of milk and air for example. Although efforts to control POPs production and release to the environment have been made, data about their levels in Brazil are still scarce, mainly in the atmosphere or indoor environment. Considering the permanence of people inside its house, this study presents a method for POP extraction from XAD-2 sorbent employed in indoor air sampling, with identification and quantification by GC-ECD. GC-ECD linear range of the studied analytes, congeners of polychlorinated biphenyls (PCB) (28, 52, 101, 118, 138, 153 and 180), DDTs and their metabolites (DDDs, DDEs) and endosullan (isomers c - and 13 - and metabolite endosulfan sulfate) ranged between 0.5 and 16.0 ng mL-I with r2 > 0.967. The method developing consist of selecting the extraction solvent system by agitation (90 rpm, 1 hour) with n-hexan,e (2 mL) or n-hexane:acetone (1:1, v/v) (2 mL), concentration the extract with a gentle N2 stream, and evaluation of breakthrough with passage or air through the fortified XAD-2 cartridge before extraction, employing a low volume air suction pump (Pump Model 224 universal-PCXR8; 5-5000 mL min-1, SKC Inc., Eighty Four, PA, USA), Calibrator Dry-Cal DC-Lite (BIOS, Butler, NJ, USA)). Two fortification levels were employed, 15 and 30 ng. After selecting n-hexane as extraction solvent, with accuracy and precision ranging...

Simetrias e sólitons do modelo de toda conforme afim

Pós-graduação em Física - IFT

A neighbourhood semantic for the Logic TK

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

O papel das tecnologias digitais em disciplinas de álgebra linear a distância: possibilidades, limites e desafios

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estrutura algébrica dos modelos integráveis

Pós-graduação em Física - IFT

Fluxo do grupo de renormalização dos modelos-'alfa' e as álgebras de Lie contínuas

Pós-graduação em Física - IFT

Marcadores prosódicos da escrita literária: uma análise da obra Manuelzão e Miguilim, de Guimarães Rosa

to each other. These approaches reveal the speaker's attitudes, their feelings expressed in statements and in the contexts in which those expressions are used. Cagliari (1989) calls this kind of discursive reference as prosodic markers in literary writing. In this project, the corpus for the analysis comes from the work of Guimarães Rosa: Manuelzão e Miguilim. The main goal of the present project is to develop studies on the subject, since there is virtually nothing done about the prosodic writing markers. Develop working methods is an important objective, in order to show how the prosodic markers can be studied. This type of study is not only important to linguistics: phonetics, textual analysis and discourse, but also to literary studies. Different ages of literary expressions used differently such resources as shown by the work of Cagliari (1989). The methodology of this project starts collecting data to compose the corpus with examples categorized as prosodic markers. Then, according to prosodic theories, these expressions are classified in types. The contexts in which they appear are important elements and they will be highlighted. The narrative of the plot is also an important context. Dialogues are good source of prosodic markers. In the work of Guimarães Rosa: Manuelzão e Miguilim, it was observed that the author likes to reveal the feelings of the characters in the novel through stated words in their speech. There are prosodic markers showing feeling like: intimidating, serene, gentle, cheerful, worried, angry, with irony, etc. The authors also refer to the fact that the character pronounced his speech with different voice qualities such as loud, hoarse, whispering, etc. This project studies the association between some prosodic elements of speech and their occurrence in literary texts as prosodic writing markers, as defined in the project. The data come from the phonetic descriptions of words and expressions regarded as prosodic...

Marcadores prosódicos da escrita literária: uma análise da obra Manuelzão e Miguilim, de Guimarães Rosa

to each other. These approaches reveal the speaker's attitudes, their feelings expressed in statements and in the contexts in which those expressions are used. Cagliari (1989) calls this kind of discursive reference as prosodic markers in literary writing. In this project, the corpus for the analysis comes from the work of Guimarães Rosa: Manuelzão e Miguilim. The main goal of the present project is to develop studies on the subject, since there is virtually nothing done about the prosodic writing markers. Develop working methods is an important objective, in order to show how the prosodic markers can be studied. This type of study is not only important to linguistics: phonetics, textual analysis and discourse, but also to literary studies. Different ages of literary expressions used differently such resources as shown by the work of Cagliari (1989). The methodology of this project starts collecting data to compose the corpus with examples categorized as prosodic markers. Then, according to prosodic theories, these expressions are classified in types. The contexts in which they appear are important elements and they will be highlighted. The narrative of the plot is also an important context. Dialogues are good source of prosodic markers. In the work of Guimarães Rosa: Manuelzão e Miguilim, it was observed that the author likes to reveal the feelings of the characters in the novel through stated words in their speech. There are prosodic markers showing feeling like: intimidating, serene, gentle, cheerful, worried, angry, with irony, etc. The authors also refer to the fact that the character pronounced his speech with different voice qualities such as loud, hoarse, whispering, etc. This project studies the association between some prosodic elements of speech and their occurrence in literary texts as prosodic writing markers, as defined in the project. The data come from the phonetic descriptions of words and expressions regarded as prosodic...

Ontogeny of manipulative behavior and nut-cracking in young tufted capuchin monkeys (Cebus apella): a Perception-action perspective

How do capuchin monkeys learn to use stones to crack open nuts? Perception-action theory posits that individuals explore producing varying spatial and force relations among objects and surfaces, thereby learning about affordances of such relations and how to produce them. Such learning supports the discovery of tool use. We present longitudinal developmental data from semifree-ranging tufted capuchin monkeys (Cebus apella) to evaluate predictions arising from Perception-action theory linking manipulative development and the onset of tool-using. Percussive actions bringing an object into contact with a surface appeared within the first year of life. Most infants readily struck nuts and other objects against stones or other surfaces from 6 months of age, but percussive actions alone were not sufficient to produce nut-cracking sequences. Placing the nut on the anvil surface and then releasing it, so that it could be struck with a stone, was the last element necessary for nut-cracking to appear in capuchins. Young chimpanzees may face a different challenge in learning to crack nuts: they readily place objects on surfaces and release them, but rarely vigorously strike objects against surfaces or other objects. Thus the challenges facing the two species in developing the same behavior (nut-cracking using a stone hammer and an anvil) may be quite different. Capuchins must inhibit a strong bias to hold nuts so that they can release them; chimpanzees must generate a percussive action rather than a gentle placing action. Generating the right actions may be as challenging as achieving the right sequence of actions in both species. Our analysis suggests a new direction for studies of social influence on young primates learning sequences of actions involving manipulation of objects in relation to surfaces.

Virasoro Action on Imaginary Verma Modules and the Operator Form of the KZ-Equation

We define the Virasoro algebra action on imaginary Verma modules for affine and construct an analogue of the Knizhnik-Zamolodchikov equation in the operator form. Both these results are based on a realization of imaginary Verma modules in terms of sums of partial differential operators.