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Solução de um modelo de vértices assimétrico de três estados
(Universidade Federal de São Carlos, 2005-03-29) Melo, Cláudio Silva de; Martins, Márcio José; https://lattes.cnpq.br/1875815921495261
In this work we first review some of the techniques relevant to the theory of two-dimensional integrable models. We apply the Quantum Inverse Scattering approach to a class of three-state vertex model with both closed and open boundaries. The respective transfer matrices eigenvalues and eigenvectors are determined by the algebraic Bethe ansatz method.
Estudo experimental da deformação ao longo do tempo de lajes contínuas e simplesmente apoiadas executadas com vigotas pré-moldadas de concreto
(Universidade Federal de São Carlos, 2005-03-29) Kataoka, Luciana Tiemi; Carvalho, Roberto Chust; https://lattes.cnpq.br/3633394168236221
This research deals with the experimental investigation of time dependent deformations in partially precast floors with composite beam-and-block floor systems made with reinforced concrete lattice joist through the measurement of deflections of prototypes with real dimensions. It is a continuation of several researches of composite beam-and-block floor systems done in Universidade Federal de São Carlos. Besides the accompanied measurement deflections of four already existents prototypes, with ages of three and a half years, it was studied eight new prototypes built in pairs. Four prototypes are localized in an acclimatized room in other to keep the values of temperature and humidity constant, and the other four prototypes, with identical characteristics, localized inside of a covered area where the temperature and humidity vary. The climatic variations were measured and analyzed in the evaluation of time dependent deformation. In the new prototypes the strain were also accompanied in the concrete and in the reinforcement, as well as their influences in time dependent deformation. Simultaneously to the experimental study, models for predicting creep are tested for prediction of deflections along the time, including the new version of Brazilian Code for Structural Concrete (NBR6118:2003). The research also establishes the ratio of long-term deflections (infinite) to the instantaneous deformation and it evaluates how the deformation develops in composite beamand- block floor systems of different supports, wherein statically and hyperstatically structures were studied. As a conclusion in this research, conforming in others already done by the study group, it has been found the results give strongly indication that the composite beam-and-block floor systems deformations are a decisive factor in design and that the shrinkage of the concrete increases this effect.
Definição de um indicador para avaliar a acessibilidade dos alunos da zona rural às escolas da zona urbana
(Universidade Federal de São Carlos, 2005-03-29) Pegoretti, Michela Sagrillo; Sanches, Suely da Penha; https://lattes.cnpq.br/3857424839674606
The main objective of this work was to establish an indicator to evaluate students accessibility from rural to urban areas. It involves the broad issue of rural versus urban dichotomy and the evolution of social and spatial segregation process in the cities, which reaches the rural area, isolsting it and restricting people s access to different activities. It also establishes the importance of cities accessibility improvement by rural zones inhabitants, through means of transportation, as a way of mitigating opportunity difference that reach people who live in the field, specially those who are attending school. This paper analyses the situation of rural school transportation in Brazil, identifying the most relevant attributes that interfere in the accessibility: children walking distances, travel time and characteristics of the roads and safety/comfort in the vehicles. The accessibility patterns were evaluated in regard to the trips from the residence to the bus stop (walk trip) and the trips from the bus stop to the schools (by motorized vehicles). The methodology for the research development consisted on the use of a multicriterial evaluation method, composed by four steps: attributes choice, determining attribute importance, normalization and combination. In one of these steps, a survey was made with 120 (one hundred twenty) professionals who act on education and transportation areas to evaluate the importance of the accessibility attributes and higher acceptable distance values travelled by foot and the travel time to school. The case study was developed in the city of São Carlos, where the defined indicator was applied to seven (07) transport lines in the afternoon period on the district of Água Vermelha. The final research result, generated on TransCAD, is shown by means of a map of multicriterial accessibility of the chosen region. The analyses realized about the results, prove that more distant boarding places from rural schools do not have, as a rule, lower levels of accessibility and that minimizing students walking distances from home to the boarding stops is a very important point to be considered on the planning of rural school transportation.