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A influência dos contextos de produção na carga de trabalho de profissionais de segurança privada.
(Universidade Federal de São Carlos, 2007-10-05) Greghi, Marina Fonseca; Camarotto, João Alberto; https://lattes.cnpq.br/1427853773681255; https://lattes.cnpq.br/6957418053245469
The literature affirms that on the last four decades has been occurring a significant raising on the number of private security companies in all over the world. In Brazil, there are estimations which point that there are 1,148 million people working as agents of private security, and this number can reach the house of 2 million people if considered the informal workers. Besides that, there are not many studies about the worker s activities on private security. This paper analyses the activity of the private security officers. It has been utilized foundation from Work Ergonomic Analysis to understand how the operator manages his workload. This paper provides findings about the perception of the private security officers that the mental workload prevails in the activity and that the main constraints are linked with the work organization, including shift work, control and supervision; and variables of consumer attendance. It is concluded that the Context of Production and Service, based on main aspects of work organization, as: prescriptions, work processes, demands of quality and productivity, has decisive influence upon the behavior of the operator. The Context of Production and Service is important to define the workload. In the activity of the professionals of private security the work is prescribed by the independent contractor and the private security company. This mediation is not a prescription that can be easily followed, but a source of constant conflicts, and then it finishes making source of constant conflicts that hold multiple dimensions and finish producing overload for the vigilant thing.
Estudo por espalhamento Raman de efeitos anarmônicos e transição de fase do PbTiO3 : Sm3+ induzidos por pressão hidrostática e variação de temperatura
(Universidade Federal de São Carlos, 2007-10-05) Machado, Marco Antonio Cunha; Pizani, Paulo Sérgio; https://lattes.cnpq.br/1038437165007849; https://lattes.cnpq.br/5662281567883957
In this work it was investigated, by using Raman spectroscopy, the effect of the substitucional disorder on the vibrational properties of the ferroelectric ceramics PbTiO3 doped with Samarium, at different temperatures and hydrostatic pressures. This material is interesting from the technological point of view because it is a combination between a material with intense ferroelectric properties and a rare earth ion, with very well known optical properties. From the academic point of view, the main purpose was to study qualitatively and quantitatively the combined chemical and structural effects on the phonon spectrum, which was achieved through measurements of the frequency shifts and broadenings of the vibrational modes, that is, the anharmonic effects. It was also investigated the changes in the Curie temperature, the critical transition pressure values and frequency pressure and temperature coefficients generated by substitucional disorder. A special attention was done to the behavior of the lower frequency mode, the so called soft mode, which plays an important role, whose frequency tends to zero with the approach of the ferroelectric-paraelectric transition. The Raman scattering, due to its sensitivity to short range order, to the character nondestructive, noninvasive is a technique well adapted to the purpose of the present study. The importance of the material and the choice of the technique are justified by the great number and quality of publications related to both in the international literature.