Prediction of dopant atom distribution on nanocrystals using thermodynamic arguments

A theoretical approach aiming at the prediction of segregation of dopant atoms on nanocrystalline systems is discussed here. It considers the free energy minimization argument in order to provide the most likely dopant distribution as a function of the total doping level. For this, it requires as input (i) a fixed polyhedral geometry with defined facets, and (ii) a set of functions that describe the surface energy as a function of dopant content for different crystallographic planes. Two Sb-doped SnO2 nanocrystalline systems with different morphology and dopant content were selected as a case study, and the calculation of the dopant distributions expected for them is presented in detail. The obtained results were compared to previously reported characterization of this system by a combination of HRTEM and surface energy calculations, and both methods are shown to be equivalent. Considering its application pre-requisites, the present theoretical approach can provide a first estimation of doping atom distribution for a wide range of nanocrystalline systems. We expect that its use will support the reduction of experimental effort for the characterization of doped nanocrystals, and also provide a solution to the characterization of systems where even state-of-art analytical techniques are limited.

Control of instabilities in non-Newtonian free surface fluid flows

Free surface flows in inclined channels can develop periodic instabilities that are propagated downstream as shock waves with well-defined wavelengths and amplitudes. Such disturbances are called roll waves and are common in channels, torrential lava, landslides, and avalanches. The prediction and detection of such waves over certain types of structures and environments are useful for the prevention of natural risks. In this work, a mathematical model is established using a theoretical approach based on Cauchy's equations with the Herschel-Bulkley rheological model inserted into the viscous part of the stress tensor. This arrangement can adequately represent the behavior of muddy fluids, such as water-clay mixture. Then, taking into account the shallow water and the Rankine-Hugoniot's (shock wave) conditions, the equation of the roll wave and its properties, profile, and propagation velocity are determined. A linear stability analysis is performed with an emphasis on determining the condition that allows the generation of such instabilities, which depends on the minimum Froude number. A sensitivity analysis on the numerical parameters is performed, and numerical results including the influence of the Froude number, the index flow and dimensionless yield stress on the amplitude, the wavelength of roll waves and the propagation velocity of roll waves are shown. We show that our numerical results were in agreement with Coussot's experimental results (1994).

Gramsci e a Teoria Crítica das Relações Internacionais

This text has the following aims: a) to discuss Gramsci and Horkheimer’s epistemological status, joined authors in an theoretical approach known as Critical Theory of International Relations; b) to draft an analysis in order to show the mentioned and joined authors’ different epistemological statuses in the theoretical approach in discussion; c) to begin a reflection pointing the absence of accuracy in this approach - whose beginning happened with Canadian political scientist Robert W. Cox – due to joining different epistemological statuses and ignoring the theoretical consequences put by respective central Gramsci and Horkheimer’s concepts: hegemony and emancipation.

Aikido: via para ascese marcial

Aikido is a Japanese martial art developed in the 20th century by Morihei Ueshiba. This self defense art, as it is known, is trained around the world as a noncompetitive practice. This work aimed to investigate and circumscribe the history of this martial art presenting features of its singularity. Akido´s Cultural History was used as a theoretical approach to build the historical background. The work was divided in five chapters as respectively named and described: Japan´s historical contextualization - it seeks to show the changing processes that happened in Japan which were arising from the insertion of other cultures, and how that insertion led the country to modernize itself and turn into a great world power. The ancient art: Aiki Jujutsu Daitoryu - talks about this samurai martial art which ensured the Aikido to obtain as the source technique the aiki, and the Xintoist practice. The history of a master: Morihei Ueshiba - presents some defining facts and moments from the master Ueshiba´s history, which points both to the changes occurred in the country, and to the ones that led the master to justify and broadcast the martial art. Aikido: The Budo art - portraits the Aikido´s meaning and the way that it was built to present the Aikido as a Budo art. And to finalize, Martial asceticism - seeks to make the dialogue between the cultures, from the meaning of this chapter title words (martial asceticism), as well as to point facts from the contemporaneity which provoke reflections upon the present practice

Uma análise da tradução de vocábulos relacionados à violência e criminalidade presentes em três obras de Patrícia Melo

Pós-graduação em Estudos Linguísticos - IBILCE

Desenvolvimento de uma metodologia para elaboração de modelos de predição dos níveis de ruído do campo acústico de usinas hidrelétricas

Pós-graduação em Engenharia Mecânica - FEIS

Programação térmica fetal: efeitos sobre a temperatura de preferência e características morfofisiológicas de frangos de corte

Pós-graduação em Zootecnia - FCAV

Teoria crítica, neoliberalismo e educação: análise reflexiva da realidade educacional brasileira a partir da reforma educacional de 1990

Pós-graduação em Educação - FFC

Avaliação da preocupação com a forma corporal: um desafio

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

Uma discussão sobre os conceitos de fronteira e território no ensino fundamental, anos iniciais, de Geografia

Pós-graduação em Geografia - FCT

Análise do processo formativo de professores para a educação não formal realizada em organizações não governamentais

This article presents research academic-scientific aimed to examine the definition and theoretical approach or model curriculum that organizes and guides the training of teachers to work in the field of non-formal education made in non-governmental organizations (NGOs). We chose to adopt the perspective of qualitative research was conducted and the case study course called Teacher Training for NGOs, developed by an NGO based in the city of São Paulo. The research instruments were used: document analysis course, semi-directive interviews with their trainers and coordinator and literature review. Examined in the course curriculum is defined as a path to be followed by students and instructors and as organizer of the subjects studied. Adopts the approach named Integrated Curriculum, in which teaching occurs through the study of problem situations and integration projects of learning. At the end of the study, it is suggested that the improvement of the course and follow information that, hopefully, support the production of further comparative research.

A produção e a compreensão do humor por uma criança bilíngue: um estudo de caso

Pós-graduação em Linguística e Língua Portuguesa - FCLAR

Imaginando o outro e a nação nas relações internacionais: Commentary Magazine, The New Republic e o intervencionismo dos Estados Unidos na Nicarágua e El Salvador (1977 - 1992)

Pós-graduação em Relações Internacionais (UNESP - UNICAMP - PUC-SP) - FFC

Programação térmica fetal e duração da fase de eclosão: efeitos sobre a qualidade na eclosão, variáveis sanguíneas, preferência térmica e resposta ao desafio térmico de pintos fêmeas

Pós-graduação em Zootecnia - FCAV

A importância da educação profissional na modalidade de educação a distância para o desenvolvimento territorial

Pós-graduação em Geografia - IGCE