Abstract. In this paper we addressed the training of High School teachers, a school which is member of State Education System from in the State of Minas IntroduçãoNa sociedade contemporânea estamos rodeados pelas novas tecnologias, as quais influenciam de forma significativa nossas vidas, desde a formação e interação sociocultural até a maneira de aquisição de novos conhecimentos. Diante dos avanços crescentes das tecnologias, a produção, disseminação e acesso às informações estão acontecendo de maneira rápida, motivada, parcialmente, pelo desenvolvimento dos sistemas informacionais e pelo acesso da população a um grande aparato tecnológico (VELLOSO, 2014). Assim, há a necessidade de criar novos métodos, estratégias e práticas de aprender e ensinar, que contemplem o atual cenário tecnológico.

RESUMO:Este estudo tem como objetivo compreender a importância da formação contínua dos professores do Ensino Médio do CESEC (Centro Estadual de Educação Continuada) Augusta Raquel da Silveira, em Lagamar-MG, como uma forma de possibilitar a adoção de novas tecnologias, especificamente o Tablet Educacional, em suas propostas pedagógicas. Como método de trabalho, escolheu-se a pesquisa-ação. Assim, por meio da implantação de três ações -formação técnica, formação pedagógica e elaboração e desenvolvimento de um plano de aula utilizando o aparelho -foi possível apresentar aos professores da instituição conhecimentos técnicos e pedagógicos referentes ao manuseio do tablet, além de proporcionar a aplicação prática do aparelho, com as devidas orientações e suporte, na rotina educacional de cada profissional. A partir do desenvolvimento das ações, foi construído e sistematizado um conjunto de saberes inerentes ao Tablet Educacional, que contribuíram para que os professores conhecessem a relevância da sua utilização, de modo a usufruírem suas possibilidades e recursos que subsidiam, de forma significativa, o trabalho docente e o processo de ensinoaprendizagem. PALAVRAS-CHAVE: tecnologias na educação; formação de professores; formação contínua de professores.

Adjuvants are used in or associated with agrochemical formulations in tank mixtures to improve and ensure the performance of active ingredients during crop management. They can modify physicochemical properties, improving the spray solution quality and stability. Adjuvants are able to improve properties such as wettability, adhesion, and spreading of spray droplets, thus contributing to better retention, persistence, and absorption/penetration of the active ingredient into the target species. As a result, an increase in productivity for the farmer can be expected. One of the most common types of adjuvants used to enhance pesticide performance is the oil-based emulsion, commonly known as crop oil concentrate. The oil component of crop oil concentrates can be derived from either mineral oil (petroleum oil concentrate) or soybean/vegetable oil (methylated seed oil). These products also contain an emulsifier system to achieve the emulsion stability necessary upon dilution for application in the spray tank. In recent years, high-load surfactant oil concentrates have been formulated that increase the functions available from the product. Four different oil concentrates were tank mixed with herbicides and fungicides and compared with regard to the following aspects of their physicochemical characterization: static and dynamic surface tension, contact angle on flat and tilted surface, emulsion stability, and adhesion. The spray droplet size distribution and drift potential were also evaluated. Some mathematical correlations were used to estimate spreading and retention. Field trials were conducted with fungicide (strobilurin and triazole mixture) and also with different herbicide combinations (glyphosate tank mixed with tembotrione and glyphosate tank mixed with clethodim). From these studies, this paper tries to connect chemical formulation features to performance results.

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Solvents play a key role in the delivery of pesticides to their respective targets. One of the most common types of agrochemical formulation is emulsifiable concentrate (EC), which basically comprises an active ingredient (AI), a solvent or blend of solvents, surfactants, and small amounts of additives. The most common solvents present in these formulas contribute to volatile organic compound (VOC) emissions, are flammable, classified as hazardous air pollutant (HAP) substances, i.e., are toxic to users and farmers, and can be phytotoxic to crops. The use of solvents that are more benign to human health and the environment is part of the “green chemistry” movement. The Principles of Green Chemistry were considered during selection and design of the new solvents described in this paper. Important features defined for these new molecules were low volatility, being derived from renewable feedstock, and low toxicity and phytotoxicity. From these studies, we present new ester solvents based on citric acid and branched alcohols derived from sugar cane. They had many desirable physical and chemical properties herein described as high boiling point, low volatility, and low freezing point. Due to their chemical characteristics, it is believed that they have low toxicity to humans and to the environment. A remarkable benefit of these products is that they do not cause eye irritation. The lab tests results showed that solubility of selected active ingredients in these esters exceed their commercial concentrations without crystallization. Based on these findings, stable EC formulations were developed using surfactants with sustainable characteristics.