114 research outputs found
Draft Genome Sequence Of 11399, A Transformable Citrus-pathogenic Strain Of Xylella Fastidiosa
The draft genome of Xylella fastidiosa subsp. pauca strain 11399, a transformable citrus-pathogenic strain, is reported here. The 11399 genome size is 2,690,704 bp and has a G+C content of 52.7%. The draft genome of 11399 reveals the absence of four type I restriction-modification system genes. © 2016 Niza et al.4
Three-dimensional CFD analysis of the hand and forearm in swimming
The purpose of this study was to analyze the hydrodynamic characteristics of a realistic model of an elite
swimmer hand/forearm using three-dimensional computational fluid dynamics techniques. A three-dimensional
domain was designed to simulate the fluid flow around a swimmer hand and forearm model in different orientations
(0°, 45°, and 90° for the three axes Ox, Oy and Oz). The hand/forearm model was obtained through
computerized tomography scans. Steady-state analyses were performed using the commercial code Fluent.
The drag coefficient presented higher values than the lift coefficient for all model orientations. The drag coefficient
of the hand/forearm model increased with the angle of attack, with the maximum value of the force
coefficient corresponding to an angle of attack of 90°. The drag coefficient obtained the highest value at an
orientation of the hand plane in which the model was directly perpendicular to the direction of the flow. An
important contribution of the lift coefficient was observed at an angle of attack of 45°, which could have an
important role in the overall propulsive force production of the hand and forearm in swimming phases, when
the angle of attack is near 45°.Lif
Swimming propulsion forces are enhanced by a small finger spread
The main aim of this study was to investigate the effect of finger spread on the propulsive force production
in swimming using computational fluid dynamics. Computer tomography scans of an Olympic swimmer
hand were conducted. This procedure involved three models of the hand with differing finger spreads: fingers
closed together (no spread), fingers with a small (0.32 cm) spread, and fingers with large (0.64 cm) spread.
Steady-state computational fluid dynamics analyses were performed using the Fluent code. The measured
forces on the hand models were decomposed into drag and lift coefficients. For hand models, angles of attack
of 0°, 15°, 30°, 45°, 60°, 75°, and 90°, with a sweep back angle of 0°, were used for the calculations. The
results showed that the model with a small spread between fingers presented higher values of drag coefficient
than did the models with fingers closed and fingers with a large spread. One can note that the drag coefficient
presented the highest values for an attack angle of 90° in the three hand models. The lift coefficient resembled
a sinusoidal curve across the attack angle. The values for the lift coefficient presented few differences among
the three models, for a given attack angle. These results suggested that fingers slightly spread could allow the
hand to create more propulsive force during swimming
Superconductivity in the ternary ZrVGe compound
We report bulk superconductivity in ZrVGe withTc=6K determined by magnetization, electronic transport and specific heat measurements. From the analysis of magnetization and resistivity data we obtain the thermodynamic critical fieldsΌ0Hc1andΌ0Hc2, respectively. The heat capacity data deviate from conventional BCS theory suggesting possible unconventional superconducting behavior
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