1,766 research outputs found

    Onde posicionar sensores de umidade e de tensão de água do solo próximo da planta para um manejo mais eficiente da água de irrigação.

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    A irrigação eficiente é aquela com menor consumo de energia e menor perda de água, contribuindo na maior conservação dos recursos hídricos, por ser aplicada no momento correto, isto é, aquele em que a umidade do solo começa a comprometer a absorção de água pela planta. Essa irrigação eficiente requer também a reposição correta da água perdida pelas plantas desde a última irrigação.bitstream/item/118884/1/CircularTecnica-109-Onde-posicionar-sensores.pd

    Editorial: The Chemistry of Biofilms and Their Inhibitors

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    Analyzing the IAR with IRI During the Recent Solar Minimum

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    The 2008-2009 solar minimum was deeper than any within the past century. As such, the performance of the empirical International Reference Ionosphere (IRI) model was impacted. This impact manifested as a disagreement between predicted and measured characteristic separation in frequency for a wave resonating within an Ionospheric Alfven Resonator (IAR). The predicted value of the characteristic was a factor of three lower than what was measured by the Communication/Navigation Outage Forecast System (C/NOFS). Analyzing the model performance and comparing output with measured ionospheric values showed that more than half of the inaccuracy could be explained by inaccuracies in the output of the model. The 2008-2009 solar minimum was outside of the bounds of the effectiveness of the empirical IRI model. Incorporating recent data measurements and new indices would increase the accuracy of IRI during this period

    Foeniculum vulgare Essential Oils: Chemical Composition, Antioxidant and Antimicrobial Activities

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    The essential oils from Foeniculum vulgare commercial aerial parts and fruits were isolated by hydrodistillation, with different distillation times (30 min, I h, 2 h and 3 h), and analyzed by GC and GC-MS. The antioxidant ability was estimated using four distinct methods. Antibacterial activity was determined by the agar diffusion method. Remarkable differences, and worrying from the quality and safety point of view, were detected in the essential oils. trans-Anethole (31-36%), alpha-pinene (14-20%) and limonene (11-13%) were the main components of the essentials oil isolated from F. vulgare dried aerial parts, whereas methyl chavicol (= estragole) (79-88%) was dominant in the fruit oils. With the DPPH method the plant oils showed better antioxidant activity than the fruits oils. With the TBARS method and at higher concentrations, fennel essential oils showed a pro-oxidant activity. None of the oils showed a hydroxyl radical scavenging capacity >50%, but they showed an ability to inhibit 5-lipoxygenase. The essential oils showed a very low antimicrobial activity. In general, the essential oils isolated during 2 h were as effective, from the biological activity point of view, as those isolated during 3 h.info:eu-repo/semantics/publishedVersio

    O Critério da Verdade no Contra Acadêmicos de Agostinho

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    Na obra Contra Academicos, Agostinho parte da questão se pode um homem alcançar sabedoria e felicidade enquanto ele procura a verdade ou somente quando ele a encontra. Ao partir dessa questão, confrontam-se os interlocutores nesse diálogo. Compreender o critério de verdade apresentado na obra pelo autor, contextualizar/analisar as fontes filosóficas, constitui um dos objetivos dessa dissertação, o que exige uma análise detalhada da obra Contra Academicos de Agostinho de Hipona (354-430). O tema da discussão no Contra Academicos é um problema relevante até os dias de hoje, merecendo um debate sério acerca de suas questões. Buscar a verdade não é um assunto banal nem supérfluo, mas necessário e fundamental . As discussões apresentadas nessa obra colocam em pauta a via filosófica na qual Agostinho se direciona, a partir de um encontro consigo mesmo e ao buscar a verdade que habita no interior do homem
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