Resumo A fruticultura brasileira exerce grande influência sobre o setor social e econômico nas mais diversas regiões do País, gerando emprego e renda no exercício de suas atividades. Por se tratar de uma atividade realizada, na maioria das vezes, de forma manual e convencional, a fruticultura possui grande potencial de crescimento tecnológico, principalmente ao adotar os conceitos aplicados pela agricultura de precisão sobre as culturas de grãos, fibras e energia, criando um novo segmento, a Fruticultura de Precisão. O presente estudo objetivou realizar uma revisão bibliográfica sobre as principais tendências que surgiram nos últimos cinco anos sobre a Fruticultura de Precisão, destacando suas perspectivas futuras e o histórico de evolução tecnológica. Foram analisados 83 artigos, classificados em diferentes culturas perenes e aplicações, como machine learning (aprendizado de máquinas), sensoriamento remoto, robótica, utilização de VANT para obtenção de diferentes índices de vegetação, entre outras.

Abstract Brazilian fruit culture has a great influence on the social and economic sector in the most diverse regions of the country, generating employment and income in the exercise of its activities. As it is an activity carried out most often in a manual and conventional manner, fruit culture has a great potential for technological growth, especially when adopting the concepts applied by precision agriculture on the crops of grains, fibers and energy, creating a new segment, Precision Fruit Farming. The present work aims to carry out a bibliographic review on the main trends that have emerged in the last five years on Precision Fruit growing, highlighting its future perspectives and the history of technological evolution. 83 articles were analyzed, classified in different perennial cultures and applications, such as machine learning, remote sensing, robotics, using UAV to obtain different vegetation indexes, among others.

Abstract Camphorquinone is the most conventionally used photoinitiator in Dentistry. Although different alternative photoinitiators have been proposed, no photoinitiator was capable of completely substituting camphorquinone. The combination of photoinitiators has been considered the best alternative. Objectives: To evaluate the effect of combining Norrish type I and II photoinitiators on the cure efficiency of dental resin-based composites. Methodology: Experimental composites were produced containing different photoinitiator systems: Norrish type I-only, mono-alkyl phosphine oxide (TPO); Norrish type II-only, camphorquinone (CQ); or its combination, CQ and TPO, in a 1: 1 molar ratio. UV-vis absorption spectrophotometry was performed to assess the consumption of each photoinitiator after curing (n=3). A multi-wave LED (Bluephase® G2, Ivoclar Vivadent) was pre-characterized and used with a radiant exposure of 24 J/cm2. The degree of conversion was evaluated by Raman spectrometry, and the elution of the monomers by nuclear magnetic resonance analysis (n=3). Data were analyzed using ANOVA and Tukey's test (α=0.05; β=0.2). Results: The combination of CQ and TPO increased the consumption of the photoinitiator system compared to CQ-only (p=0.001), but presented similar consumption compared to TPO-only (p=0.52). There was no significant difference in the degree of conversion between the composites regardless of the photoinitiator system (p=0.81). However, the elution of the monomers was reduced when both photoinitiators were combined. TPO-based material presented the highest elution of monomers. Conclusions: The combination of the photoinitiator systems seems to be beneficial for the cure efficiency of dental resin-based composites.

Neste trabalho, concentramo-nos em um método específico na teoria de perturbação, o método das escalas múltiplas. Desenvolvido na mecânica clássica para o tratamento de equações diferenciais não-lineares, este método é aplicado como uma ferramenta matemática na descrição de efeitos perturbativos em vários sistemas físicos. Desta forma queremos mostrar algumas aplicações deste método, em circuitos elétricos LC e RLC.

In this work, we focus on a specific method of perturbation theory, the method of multiple scales. Developed in classical mechanics for the treatment of non-linear differential equations, this method is applied as a mathematical tool in the description of perturbative effects in several physical systems. Thus we show some applications of this method, electrical circuits LC and RLC.

Neste trabalho, concentramo-nos em um método específico na teoria de perturbação, o método das escalas múltiplas. Desenvolvido na mecânica clássica para o tratamento de equações diferenciais não-lineares, este método é aplicado como uma ferramenta matemática na descrição de efeitos perturbativos em vários sistemas físicos. Desta forma queremos mostrar a aplicação deste método, tanto no contexto clássico como quântico utilizando a equação de Duffing.

In this work, we focus on a specific method of perturbation theory, the method of multiple scales. Developed in classical mechanics for the treatment of non-linear differential equations, this method is applied as a mathematical tool in the description of perturbative effects in several physical systems. Therefore, in order to exemplify this method, we apply it to the Duffing equation both in the classical and quantum contexts.