A qualidade de placas de circuito impresso confeccionadas a partir de poliestireno reciclado

Pós-graduação em Engenharia Mecânica - FEG

Avaliação cefalométrica das alterações esqueléticas, dentárias do perfil facial naturais e induzidas pelos aparelhos de Herbst e Bionator no tratamento da má oclusão de Classe II, divisão 1ª

Pós-graduação em Ciências Odontológicas - FOAR

Estudo de placas com várias condições de contorno e de carregamento através do método dos elementos de contorno

Even today tables are used in the calculation of structures formed by flat elements, these methods are acceptable only for a limited number of cases, but even so, in some situations, tables are used. With time some methods of differential equations resolutions were emerging and accepted as the most effective solution. Today, with the advancement in technology, there are already some programs able to solve more complex problems in less time using these methods. Aiming to optimize time and better understand the physical behavior of plates, this work presents the theory of plate, the Boundary Element Method (BEM) applied to solve problems of plates (slabs) with various boundary conditions and load through the program Placas2 (TAGUTI, Y.-2010) in Fortran language

Estudo para a implementação de um sistema de desbaste de cobre para manufatura de placas de circuito impresso

This paper presents a study on the development of a manufacturing system of printed circuit boards through copper milling. An advantage of this system is the replacement of chemical processes by physical process presenting a sustainable solution. The paper uses programs that will generate G-code needed to establish the coordinates where the milling forms the tracks. After obtaining the code, it will be transformed into steps that will be sent through the serial port to the microcontroller and the serial communication control will be in software. After obtaining information the microcontroller will execute the movement of the stepper motors through their drivers, H-bridge, the microcontroller also drives the spindle motor responsible for rotating the grinding tool, using a driver with a optocoupler and TRIAC

Estudo de placas elásticas pelo metodo dos elementos de contorno

Este trabajo tiene como objetivo principal oferecer una herramienta alternativa para la resolución de placas finas, presentes en edifícios, relacionadas con los métodos de cálculo adquiridos durante la universidad, calculo a través de tablas con pocas condiciones de controno. El método utilizado es el Método de los elementos de contorno que discretiza la placa en partes finitas, aproximando los resultados obtenidos a valores reales. En este trabajo se ha utilizado el programa de ordenador Placas2.for (TAGUTI,Y. 2010) basado en el Método de los elementos de contorno para la resolución de las placas finas con varias condiciones de contorno geométricas y de cargas

Implementação do algoritmo de Newman para identificação de comunidades em placas gráficas

Communities are present on physical, chemical and biological systems and their identification is fundamental for the comprehension of the behavior of these systems. Recently, available data related to complex networks have grown exponentially, demanding more computational power. The Graphical Processing Unit (GPU) is a cost effective alternative suitable for this purpose. We investigate the convenience of this for network science by proposing a GPU based implementation of Newman community detection algorithm. We showed that the processing time of matrix multiplications of GPUs grow slower than CPUs in relation to the matrix size. It was proven, thus, that GPU processing power is a viable solution for community dentification simulation that demand high computational power. Our implementation was tested on an integrated biological network for the bacterium Escherichia coli

Reciclagem de poliestireno expandido: compósito com fibras de algodão para a confecção de placas de circuito impresso

In this work polymeric composites reinforced with cotton fibers, from the textile industry, were developed in order to manufacture printed circuit boards. It was used expanded polystyrene (EPS) as a thermoplastic matrix by melting it. For the obtention of 10% and 15% of fiber volume fraction in cotton fibers composites, it was used wasted cotton fibers as an incentive of recycling and reusing of the domestic and industrial wastes as well as for Expanded Polystyrene(EPS). The mechanical properties of the composites were evaluated by tensile and flexural strength from standardized test methods. Composites were characterized by a Scanning Electron Microscopy (SEM), Thermogravimetry (TG/DTG), Differential Scanning Calorimetry (DSC) and dielectric analysis. The analysis of the results showed that fiber in the composite directly influenced in the thermal and mechanical properties

Reciclagem de poliestireno expandido: compósito com fibras de sisal para confecção de placas de circuito impresso

In this work polystyrene composites reinforced with recycled sisal fibers were processed, in order to apply in the manufacture of printed circuit boards. A thermoplastic matrix of recycled polystyrene was used, this material came from waste expanded polystyrene (EPS) used in appliance's packages. Composites were prepared with 15% and 25% of sisal fibers. To obtain the composites, wasted EPS and natural sisal fibers were chosen, to encourage recycling and reuse of household waste and also the use of renewable resources. The composites were analyzed by standard tensile and flexural test, in order to verify the mechanical properties of the material. The characterization of the composite was done by scanning electron microscopy (SEM) , thermogravimetry (TGA / DTG) , differential scanning calorimetry (DSC) and dielectric analysis . The analysis of the results showed that the percentage of fibers in the composite influences directly the thermal and mechanical properties. Plates with a lower percentage of fibers showed superior properties at a higher percentage. The composite material obtained is easy to process and it's use is feasible for the confection of printed circuit boards, considering it's mechanical, thermal and insulative properties

Características psicológicas, faciais e buco-dentárias de crianças com bruxismo da clínica de odontopediatria da Faculdade de Odontologia Araçatuba - Unesp

Pós-graduação em Ciência Odontólogica - FOA

Avaliação das alterações dentárias e esqueléticas induzidas pelo uso do aparelho de Herbst no tratamento da classe II na dentadura mista: Revisão sistemática

Objective: evaluate the immediate dental and skeletal changes induced by the Herbst appliance on early treatment of Angle´s Class II malocclusion. Material and Method: several electronic databases such as Scopus, Pub Med, Medline, Cochrane Library, Lilacs and Scielo were searched. The abstracts that fullfilled the selection criteria were selected and those that did not provide enough information about these criteria were selected but the final decision of including them or not on the research, was taken after the complete reading of the article. The selection criteria were: clinical studies with Class II individuals, both male and female, with initial age of 7 to 10 years, treated with the Herbst appliance that analysed the dental and/or skeletal changes evaluated on lateral cephalometric radiographs; researches where the treatment performed did not involve extractions or surgical interventions; studies that included patients without syndromes or health concerns and articles published in English or Portuguese. Results and Conclusions: five articles were selected. The articles showed that significant changes happened in the mandibular sagittal lenght, on facial convexity angle, on maxillo-mandibular relationship, on retroclination of the upper incisors and on distal movement of the upper molars, on proclination of the lower incisors and on extrusion of the lower molars. The appliance exerted a limited effect on the anterior relocation of the maxillary complex and on facial heights. However, more studies about the performance of the Herbst appliance on early treatment of Class II are needed.

Estimativa da altura por dimensões dentárias: uma revisão da literatura

The knowledge of Forensic Anthropology is very importance in cases of identification of human remains. One phase of this process is the study of human height, which can be accomplished with relative ease when intact corpses, complete skeletons or long bones are available. However, the experience of Forensic Dentistry is essential in situations in which there is only information of the skull or of the teeth. The objective of this study was to review in the literature and evaluate works concerning the estimate of the height calculated from dental dimensions. Carrea, in 1920, proposed the estimation of the probable height of an individual by developing formulas for maximum and minimum heights from measurements of the lower central and lateral incisors and canines. The method was used in the case "Josef Mengele", to complement estimates. Tested in the Brazilian population, 70% of match between the actual and the estimated stature were obtained. Using more precise instruments, in the modified method, 96% of correct matching were verified. Recently, a new formula was introduced to estimate height, from measurements of upper teeth, because the technique cannot be used when jaw is not available. The correlation between height and dental dimensions is demonstrated. However, there is still a lack in scientific literature in this field, and further studies are necessary. The estimate of height from dental dimensions can be very useful and important, especially in situations where the complete skeleton it not found, and long bones are not available.

Variação da temperatura superficial dos músculos masseter e temporal anterior durante o apertamento dental voluntário com placas interoclusais maxilares de duas diferentes espessuras

Muscle activity has been studied indirectly through analyses of temperature variation in skin surface temperature on the masticatory muscles. These procedure may be an important tool for clinical evaluation and assessment of the evolution of temporomandibular disorders, as well as monitoring the adopted protocol. Thus, its utilization for identified pathological alterations on blood circulation and/or on metabolic activity in subcutaneous tissues, such as the masticatory muscles, is justified. The aim of this study was to investigate the effect of occlusal splints’ thickness on the variation of surface temperature of the anterior temporal and masseter muscles during rest and clenching. It were analyzed 20 symptomatic subjects (10 males and 10 females) selected through the Research Diagnostic Criteria (RDC) questionnaire. Temperature expressed in degrees Celsius (ºC) was measured on the surface of both muscles measured with the aid of a digital thermometer with an infrared radiation reading system. The surface temperature of the anterior temporal and masseter muscles presented significant reduction during teeth clenching in relation to the mandibular rest position. However, there were no significant differences between conditions with and without occlusal splint or between the different thicknesses of splints analyzed. Masticatory muscles showed a considerable similar behavior for both sides, and no significant distinctions were observed between male and female patients.

Saúde bucal e educação infantil: avaliação do desgaste e do acondicionamento de escovas dentárias utilizadas por pré-escolares

Introduction: Early childhood is an essential phase of life for the future of oral health. The link between educational and health sectors can facilitate incorporating educational and preventive oral health practices in daily teaching in pre-schools. The main measure is manual tooth-brushing, which is the most accessible method for most of the population. Objective: The objective of this study is to evaluate macroscopically the wear on the bristles, form of storage, and identification of tooth brushes. Material and method: 345 toothbrushes used by children between the ages of 2 and 5 were evaluated in 4 pre-schools, by 2 participants from the oral health program. The Rawls et al. index was used to evaluate the bristles. Result: There were statistically significant differences (p = 0.020 - Mann-Whitney U test) between the frequency of toothbrushes, with the highest being (n = 205) stored at participating school; and, between adequate and inadequate brushes (p < 0.05 - X2 test) with 31.7 and 60%, respectively, classified as unfit for tooth-brushing. Of the toothbrush holders evaluated 100% were used collectively. Regarding identification, 18% of the toothbrushes were not identified in participating schools, and 37% in the others. Conclusion: The toothbrushes exhibited marked wear, and storage was inadequate; however, the schools participating in the oral health program showed toothbrushes with bristles less worn. It is suggested that training of educators regarding correct storage and evaluation of toothbrushes for wear of the bristles should be undertaken in all early childhood schools.

Percepção e atitudes de pedagogos sobre aspectos relevantes do uso de escovas dentárias

Objective: To evaluate the perception and attitude of kindergarten teachers in relation to the storage of toothbrushes. Methodology: The analysis instrument used was a structured and previously validated questionnaire. The sample universe of this study was composed of all states and municipals kindergarten school teachers who taught in school year of 2010 at the town of Araçatuba / SP (n = 232). The criteria used to integrate the study were: to have a college degree and agree to participate. Results: 164 teachers participated of the study. The results were analyzed using Epi Info 6.04 and showed that 55% of the teachers had received some information about the proper storage of toothbrushes, and only 35% believed that the toothbrushes were storaged improperly. Most teachers, 97% reported being possible the transmission of microorganisms through the brush, however, there was observed difficulty in identifying which diseases could be transmitted. About the question related to the execute of supervised toothbrushing, 93% of the educators said that they realize supervised toothbrushing and the same percentage was observed for the identification of preschoolers at the toothbrushes. Conclusions: The perception and attitude of the teachers ahead the storage of toothbrushes are weak and limited, so there is a need for educational programs targeted to this group, so that they would have more information and knowledge related to the correct storage of toothbrushes and would continue to perform oral health preventive methods.

Utilização de trocadores de calor de placas em espiral em processos da indústria siderúrgica

Stricter environmental policies are shown necessary to ensure an effective pollutant emission control. It is expected for the present year of 2015, that Brazil will assume, at the 21th United Nation's Climate Change Conference (COP21), implementation of commitment to a low carbon economy. This positioning affects the industrial environment, so that is deemed necessary to search for new technologies, less aggressive to the environment, so the adequacies to the new emission policies do not cause a negative effect on production. Almost all of the processes performed in the steel industry demand burning fuel and, therefore, flue gases are sent to the atmosphere. In this present work is discussed the utilization of heat exchangers so, by recovering part of the available heat from the flue gases of certain industrial process, the combustion air is preheated. The combustion air preheat results in less energy requirement, i.e., less need of fuel consumption and, in addition, minor amount of pollutants to be emitted. Due to better fitting to the process, it is studied the utilization of spiral plate heat exchangers. The heat exchanger dimensioning is made by an iterative method implemented in the software Microsoft Excel. Subsequently are analyzed the gains in terms of process's thermal efficiency improvement and the percentage of fuel saving. The latter implies in reduction of the same percentage of greenhouse gases emission