Coletas de sementes em árvores altas.

bitstream/CNPF-2009-09/42432/1/Doc145.pdf1 CD-ROM

A review of advanced air distribution methods - theory, practice, limitations and solutions

Ventilation and air distribution methods are important for indoor thermal environments and air quality. Effective distribution of airflow for indoor built environments with the aim of simultaneously offsetting thermal and ventilation loads in an energy efficient manner has been the research focus in the past several decades. Based on airflow characteristics, ventilation methods can be categorized as fully mixed or non-uniform. Non-uniform methods can be further divided into piston, stratified and task zone ventilation. In this paper, the theory, performance, practical applications, limitations and solutions pertaining to ventilation and air distribution methods are critically reviewed. Since many ventilation methods are buoyancy driving that confines their use for heating mode, some methods suitable for heating are discussed. Furthermore, measuring and evaluating methods for ventilation and air distribution are also discussed to give a comprehensive framework of the review

The Visualization - Visual Comparative Analysis of Early Romanesque Churches

The paper presents educative aspects of visualization techniques performed in order to achieve the visual comparison of early romanesque or pre-romanesque churches of rotunda type. It explains and renders how computer techniques are used in order to achieve reliable basis for comparison of dimensions, volumetrics, material, proportions and other features

Behaviour of elasto/visco-plastic workpiece material during machining

Experimental investigations of plastic deformation and uniaxial tension of elasto/visco-plastic (E/V-P) material (41Cr4) were conducted to characterize the flow behavior of the material. Dynamic effects, constitutive damage law and contact with non-linear friction in simulations were described using updated Lagrangian formulation. That model of the process allows defining advanced simulations of tool's penetration in workpiece and chip formation. The yield stress is taken as a function of the strain and the strain rate in order to reflect realistic behavior of unsteady-state process, a material separation criterion based on the failure strain ?f were determined Finite element simulations were carried out using ANSYS code. The influence of the chosen process parameter in numerical simulations on the chip's shapes was presented. Results revealed good agreements between FEM results and experimental ones

Valve-in-Valve in Small Surgical Valves: Predictors for Survival and Elevated Post Procedural Gradients. Insights from the Valve-in-Valve International Data (VIVID) Registry

Thoracic Surger