Gás natural no panorama brasileiro e um estudo de caso no setor automotivo

The intended purpose of this paper is to present the main aspects of natural gas applied to the public transportation as well as the environmental, economical and technical impacts in this sector. Also it is given specific information to be considered when comparing natural gas to other fuels, specially the diesel. At this point is presented the types of internal combustion engines (Otto and Diesel cycle) and which type is used in each vehicle. Moreover, it is presented the main standards pollutant emission (Euro, US and Proconve) with a brief explanation of the tests made in order to approve the engines. This paper is focused on heavy duty vehicles. Also in this paper is exposed the economic impact due to the natural gas use in the public transportation fleet. In addition is presented a real case (of Berlin) and an estimative to a Brazilian city, presenting the potential of natural gas as vehicular fuel in Brazil, as well as financial and environmental aspects of the substitution

Desenvolvimento da oralidade em crianças de três a quatro anos: descrevendo jogos e brincadeiras que produzem novas formas de comportamento

The goal for this communication is the speech development in children three to four years, and how games and child's plays can help them in the process. For this, we have set three specific goals. They are: select games and activities that serve as a means of furthering the development of speech; elect three activities, making sure at what point is the extra step to the outbreak of the sign/symbol and identify at what time of play the child uses more talk and no change in psychological structure. These games have been applied to children from three to four years in order to identify and record their actions and speeches during activities. Acquiring the ability to speak, the kids will be able to communicate socially and develop new forms of behavior. From young children already expresses themselves through babbling and even crying, because do not have a conventional language yet. From the social relationship, the child tends to become familiar with the language, and gradually learn how to use it, expressing her feelings and desires. When the development of language and thought intersect, transform the course of action of the child who begins to have control of your action. Such its importance in society, the language became the basis of childhood education and is the duty of teachers and educators to appropriate the necessary encouragement to the child to develop or improve her language