In selective withdrawal, the interface between two liquid layers is deformed by an imposed withdrawal flow. A shape transition occurs at a threshold flow rate that changes the topology of the interface from a steady-state hump to an entrained spout. Near the transition a very sharp hump tip occurs, with the minimum tip radius far smaller than the characteristic lateral length-scale. Previous me...

the large amount of computation necessary for obtaining time optimal solution for moving a manipulator on specified path has made it impossible to introduce an on line time optimal control algorithm. most of this computational burden is due to calculation of switching points. in this paper a learning algorithm is proposed for finding the switching points. the method, which can be used for both ...

OBJECTIVE It is known from animal experiments that blood flow through the ductus venosus changes with fetal strain. Therefore the ratio of umbilical vein to ductus venosus flow rate in human intrauterine growth retardation and multifetal pregnancies was investigated and compared with that in control subjects. STUDY DESIGN Blood flow rates in the umbilical vein and in the ductus venosus, as we...

Anisotropies in the elasticity, sound velocity, and minimum thermal conductivity of low borides VB, V5B6, V3B4, V2B3 are discussed using first-principles calculations. The various elastic anisotropic indexes (AU, Acomp, Ashear), three-dimensional (3D) surface contours, their planar projections among different crystallographic planes bulk modulus, shear Young’s modulus used to characterize aniso...

BACKGROUND Obesity is a risk factor for chronic venous insufficiency and venous thromboembolism. The aim of this study was to compare venous flow parameters of the lower limbs assessed by duplex ultrasound scanning in obese and nonobese individuals according to body mass index (BMI). METHODS Venous hemodynamics were studied in a prospective cohort study in nonobese (BMI <25 kg/m(2)) and obese...

Abstract. In fully developed turbulence, the velocity field possesses long-range correlations, 10 denoted by a scaling power spectrum or structure functions. Here we consider the autocorrelation 11 function of velocity increment Δu`(t) at separation distance time `. Anselmet et al. [Anselmet 12 et al. J. Fluid Mech. 140, 63 (1984)] have found that the autocorrelation function of velocity 13 inc...

This paper presents the determination of a concentration at the minimum bubble velocity (CMV) for different types of frothers, such as straight and branched alkyl chain aliphatic alcohols, 1,ω-diols, poly(propylene glycol) and poly(ethylene glycol) alkyl ethers, n-alkyltrimethylammonium bromides, commercial frothers and others. The values of terminal rise bubble velocity were reviewed from the ...

Motor control neuroscientists measure limb trajectories and extract the onset of the movement for a variety of purposes. Such trajectories are often aligned relative to the onset of individual movement before the features of that movement are extracted and their properties are inspected. Onset detection is performed either manually or automatically, typically by selecting a velocity threshold. ...