300 research outputs found

    Condutitvidade hisráulica do solo coeso dos tabuleiros costeiros cultivado com citros.

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    Avalia através da determinação da condutividade hidráulica não saturada, o movimento de água em agrissolo acinzentado coeso dos tabuleiros costeiros cultivado com citros.bitstream/CPATC/19569/1/bp-22.pdfISSN 1678-1961

    Diferentes substratos na produção de porta-enxertos de caramboleira.

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    Objetivou-se com o presente estudo verificar a influência de diferentes substratos na produção de porta-enxertos de caramboleira. As sementes foram extraídas de frutos maduros de carambola cultívar Malásía, lavadas em água corrente e semeadas em bandejas de poliestireno (72 células, capacidade de 120 cm3/célula), contendo os seguintes substratos: vermículita, Plantmax, Rendmax, terra de barranco, areia e terra + areia (1:1, 2:1 e 1:2 v/v). Em seguída, as bandejas foram colocadas em ambiente coberto por sombrite com 50 % de lurninosidade, efetuando-se regas manuais diárias. Após 130 dias da semeadura, foram coletados os seguintes dados biométricos: porcentagem de plantas vivas, altura das plântulas, comprimento das raízes e número de folhas. Concluiu-se que a mistura terra + areia (1:1 v/v) foi mais eficiente na germinação de sementes e formação inicial de porta-enxertos de caramboleira

    Event-based causality in virtual reality

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    In this paper, we describe such an environment, in which the user can be presented in real-time with an alternative range of consequences for a given interaction with virtual world objects, thus inducing various perceptions of causality. From a systemic perspective, we can adopt a pragmatic approach, inspired from Humian philosophy, which considers that causal relations are established by the user in response to certain event co-occurrences. To control causal perception in VR, the system comprises the following components: a visualisation engine, an Event Recognition System (together with its specific event formalism that supports event modification), and a causal engine as an Event Modification System, which selects co-occurring events on a rule-based manner. A search process, evaluates alternative consequences using semantic and spatio-contiguity information, such as comparison between candidate objects on which the action consequences should be applied. A first prototype has been fully implemented and is described together with an example real-time simulation

    Shot peening of a sintered Ni-Cu-Mo steel produced by diffusion bonded powders

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    The influence of the mechanical properties of a diffusion bonded Ni-Cu-Mo sintered steel on the residual stressesand the plastic deformation promoted by both steel and ceramic shot peening was investigated. While steel shotsdeform the surface more extensively than ceramic ones, leading to a thicker surface densification, ceramic shotsare more effective in terms of maximum compressive residual stresses. The increase in the yield strength of thebase material enhances residual stresses and reduces plastic deformation. The strain induced transformation ofNi-rich austenite in martensite causes a slight decrease of tensile elongation and of impact energy in specimenssintered at low temperature
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