62 research outputs found
Lubricated revolute joints in rigid multibody systems
The main purpose of this work is to present a general methodology for modeling lubricated revolute joints in constrained rigid multibody systems. In the dynamic analysis of journal-bearings, the hydrodynamic forces, which include both squeeze and wedge effects, generated by the lubricant fluid, oppose the journal motion. The hydrodynamic forces are obtained by integrating the pressure distribution evaluated with the aid of Reynoldsâ equation, written for the dynamic regime. The hydrodynamic forces built up by the lubricant fluid are evaluated from the system state variables and included into the equations of motion of the multibody system. Numerical examples are presented in order to demonstrate the use of the methodologies and procedures described in this work.Fundação para a CiĂȘncia e a Tecnologia (FCT
Influence of structural distortions on the Ir magnetism in Ba2âxSrxYIrO6 double perovskites
Through Student Eyes: Perceptions and Aspirations of Students from the Armenian State Agrarian University and Selected European Universities
Stabilization of the Ti3Co5B2-type structure for Ti3âSi Ru5B2 through SiâTi substitution
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The roles of olfaction and vision in host-plant finding by the diamondback moth, Plutella xylostella
The relative roles of olfaction and vision in the crepuscular host-finding process of a major lepidopteran pest of cruciferous crops, the diamondback moth Plutella xylostella are investigated in a series of laboratory and semi-field experiments. Flying female moths use volatile plant chemical cues to locate and to promote landing on their host, even in complex mixed-crop environments in large cages. Multiple regression analysis shows that both the plant position (front, middle or back rows) and the type of plant (host plant, nonhost plant) are needed to explain the distribution of insects in such a mixed-crop situation. This strong plant position effect indicates that, when host plants are present in a mixture, foraging P. xylostella are more likely to alight on the first row of the plants. The findings are discussed with regard to current theories of host-plant location by phytophagous insects and the possible implications for integrated pest management
Twoâgeneration preschool programme: immediate and 7âyearâold outcomes for lowâincome children and their parents
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