Avaliação das técnicas de soldagem MIG-P CA e MIG-P CC+ aplicadas ao passe de enchimento em liga de alumínio AA5083

For contain beneficial properties, aluminum alloys are gaining more importance in different industrial areas, becoming the subject of study in several academic fields. When related to welding these alloys have some peculiarities that may hinder the union, such as microscopic oxide layer present on the metal surface. The MIG welding process, also known as GMAW, has developed versions that can be effective for welding aluminum. Knowing this, for this paper, two versions of pulsed MIG (CC + and CA) were chosen to evaluate which best suits pass by filling bevel on AA5083 aluminum sheets with 8 and 12 mm thick respectively. Furthermore, two types of wire, ER5087 and ER5183 were evaluated. To evaluate the process and versions of the wires, the high-speed cameras and thermal were used to monitor the metal transfer and the thermal behavior respectively, and the metallographic analysis for macrographic view of the weld beads and non-destructive testing by radiography for observation of possible discontinuities. It was found that the technique of MIG-P CA showed better results ahead of another technique both welding conditions imposed. When connected to the wires, they showed similar results, with uniform cords and seamless

Modelo matemático para otimização dos custos de um sistema híbrido eólico-solar : aplicação no bombeamento de petróleo

This work purposes the application of a methodology to optimize the implantation cost of an wind-solar hybrid system for oil pumping. The developed model is estimated the implantation cost of system through Multiple Linear Regression technique, on the basis of the previous knowledge of variables: necessary capacity of storage, total daily energy demand, wind power, module power and module number. These variables are gotten by means of sizing. The considered model not only can be applied to the oil pumping, but also for any other purposes of electric energy generation for conversion of solar, wind or solar-wind energy, that demand short powers. Parametric statistical T-student tests had been used to detect the significant difference in the average of total cost to being considered the diameter of the wind, F by Snedecor in the variance analysis to test if the coefficients of the considered model are significantly different of zero and test not-parametric statistical by Friedman, toverify if there is difference in the system cost, by being considered the photovoltaic module powers. In decision of hypothesis tests was considered a 5%-significant level. The configurations module powers showed significant differences in total cost of investment by considering an electrical motor of 3 HP. The configurations module powers showed significant differences in total cost of investment by considering an electrical motor of 5 HP only to wind speed of 4m/s and 6 m/s in wind of 3 m, 4m and 5 m of diameter. There was not significant difference in costs to diameters of winds of 3 m and 4m. The mathematical model and the computational program may be used to others applications which require electrical between 2.250 W and 3.750 W. A computational program was developed to assist the study of several configurations that optimizes the implantation cost of an wind-solar system through considered mathematical model

Minicontos: uma prática de letramento emergente na escola

Like numerous other mini ficçion genres, the Flash fiction is configured as a concise and brief genre, but it can still preserve some elements of the traditional tale, such as: narrator, space-temporal unit, characters and plot. For some authors, the emergence of this genre is strictly connected to the speed and diversity of forms of communication in the current social context, that require the reader other skills in addition to reading and writing. Considering the importance of these skills in a literate society and recognizing this genre as potentially effective tool for the development of literacy, this research has as objective to describe the development and implications of didactic sequence directed the literacy practices with the Flash fiction genre. Thus, the research becomes effective in an elementary school vespertine class in 9th grade from Escola Estadual Dr. José Gonçalves de Medeiros, located in the city of Acari-RN. As theoretical assumptions, it will be used fundamentals from Literacy Studies as social practice, especially that ones discussed by the writings Kleiman (1995), Hamilton (2000), Soares (2012), Mortatti (2004) and Rojo (2012). To subsidize the literary literacy, it will be used the theoretical contibutions of Borges (2000), Candido (2004), Pinheiro (2001) and Silva e Silveira (2013). In what relates to the study about the storytellers, it was taken by support the postulates of Gotlib (2006), Bosi (1997), Cortázar (1999), Talbot (2002), Poe (s/d), Luzia de Maria (2004), as well as studies by researchers and writers as Spalding (2007; 2008; 2011), George (2007), Freire (2004) and Trevisan (1994), among others who are dedicated to study Flash fiction. In the methodological field, the proposed perspective anchors itself in an action-researching guidelines (MOREIRA; CALEFFE, 2006) and in the approach of a qualitative data (BOGDAN; BIKLEN, 1994), since it talks to interpretation of diagnosed situation, implementation of intervention actions organized in didactic sequence (SCHNEUWLY; DOLZ, 2004; BARROS; RIVERS-registry, 2014), including description and evaluation of results achieved from the implementation of such actions. The discussions generated indicate that the work with Flash ficition, developed by means of didactic sequences, contributes to the reflection on teaching strategies of Portuguese, used to prepare the students to meet the demands of reading and writing of contemporary society.

Função compras no setor público: fatores preponderantes para o alcance da celeridade dos pregões eletrônicos da Base Aérea de Natal

This study discusses the issue of deadlines in the purchasing process within the Federal Public Administration. Your main goal is to analyze the main factors that influenced, mainly in the implementation of sub-phases of electronic trading in BANT, in 2014, as service to the principle of celerity. The research is descriptive since they were identified and analyzed the factors that influenced in terms of purchases, through direct observation and interviews. Based on the theoretical framework, the purchasing function, four dimensions of analysis were established: "Legislation and procurement processes", "Structure and Organization of the purchasing department", "purchasing systems" and "Human Resources of the purchasing department." Analysis showed that, unlike what happens in the private sector, the public procurement sector has not reached a strategic status within organizations, which brings harmful consequences to the speed of the purchases. It was found that there is a need for greater involvement of the purchasing department staff and criers in the formulation of the organization's purchasing strategies and that these purchases elements present, about their attitudes, a hybrid profile, proactive regarding specifications of the items, but reactive in relation to the need to urgently purchase, due to the lack of a better plan, which overloads the work of the sector. The observation of these strategic aspects of the procurement function in BANT influenced the finding that the lack of staff and expertise in investments plus the lack of rigor and formality of legislation, among other factors, contributed mainly to the lack of speed of processes.