Objectives: The purpose the study was to evaluate role of diffusion weighted magnetic resonance imaging (DW-MRI) in diagnosis benign and malignant breast lesions, calculate a cut-off apparent coefficient (ADC) value explore use relative ADC (r ADC) for improving sensitivity specificity MRI cancer. Methods: This retrospective based on cohort patients who underwent dynamic contrast enhanced (DCE)...

We analyze frictionaly damped orbits in central potentials. When the potential is a monomial in the radius, the orbit shape and precession angle remain constant to leading order in the linear friction coefficient. This is not a consequence of any obvious symmetry, but for motion in the Kepler potential may be understood in terms of the generalization of Poisson structure to damped systems sugge...

The vibration performance is critical to the suspension control and torque precision of magnetically suspended momentum flywheel (MSMW). translational torsional MSMW are investigated in this article, damping regulation method proposed improve anti-vibration MSMW. Firstly, modellings MSMW, including dynamic models displacement coordinate, developed, comprehensive characteristics investigated. Mo...

The effect of fine particles on turbulence damping and reduction of flow friction coefficient in ribleted pipes, have been investigated experimentally. Tests have been conducted in a ribleted pipe with hydraulic diameter of 18.6 mm, and 20 stream wise riblets of 1.8 mm depth, along the pipe. Flows of water tap with Reynolds number from 5000 to 30000 were compared with flows containing silt-clay...

abstract: for many years, the wood of walnut tree (juglans regia) has been used for making santur. even though artisans have their own divers’ ideas about this species’ features; until now there has been no scientific data to support them. in santur’s case specially, differently cut surface plates can be formed into final instrument. besides, some steam treatments, which supposedly improve the ...