When a superfluid flows past an obstacle, quantized vortices can be created in the wake above certain critical velocity. In experiment by Kwon et al. [Phys. Rev. A 91, 053615 (2015)], velocity ${v}_{c}$ was measured for atomic Bose-Einstein condensates (BECs) using moving repulsive Gaussian potential, and minimized when potential height ${V}_{0}$ of obstacle close to condensate chemical $\ensur...

This paper deals with a method for generating symmetrical trapezoidal acceleration profiles the motor of vibrating system in rest-to-velocity motion. The aim was to significantly reduce time and residual load vibration lightly damped systems. Under undamped conditions, analytical values jerk are found be relation estimated natural frequency minimum value is provided, also taking into account li...

We present the velocity profile measured within a porous bed below rough turbulent open channel flow. Mean streamwise velocity has a minimum in the top pore, just below the bed surface, and then increases towards a constant value in the deeper pores. We argue that the velocity minimum in the top pore is due to enhanced turbulence generated within the external flow. This produces a flow regime s...

I propose a general class of space-times whose structure is governed by observer-independent scales of both velocity (c) and length (Planck length), and I observe that these space-times can naturally host a modification of FitzGerald-Lorentz contraction such that lengths which in their inertial rest frame are bigger than a " minimum length " are also bigger than the minimum length in all other ...

When a battery-powered robot needs to operate for a long period of time, optimizing its energy consumption becomes critical. Driving motors are a major source of power consumption for mobile robots. In this paper, we study the problem of finding optimal paths and velocity profiles for car-like robots so as to minimize the energy consumed during motion. We start with an established model for ene...

This Letter deals with an analysis of bending edge waves propagating along the free edge of a Kirchhoff plate supported by a Winkler foundation. The presence of a foundation leads to a non-zero cut-off frequency for this wave, along with a local minimum of the associated phase velocity. This minimum phase velocity corresponds to a critical speed of an edge moving load and is analogous to that i...

A three-dimensional finite difference model was employed for the borehole ground heat exchanger to perform a thermal response test analysis using the parameter estimation technique. This allowed the groundwater velocity to be determined simultaneously together with the ground thermal conductivity and the borehole thermal resistance. It was found that the estimated groundwater velocity scattered...

thin layer drying of russian olive (elaeagnusan gastifolial l.) fruit using a hot air dryer in order to calculate effective moisture diffusivity, activation energy and energy consumption has been evaluated in this article. the selected variables included three levels of air velocity of 0.5, 1 and 1.5 m/s and three air temperature levels of 50, 60 and 70°c. increased air temperature increased ef...

the present study investigated the influence of air temperature and velocity on the drying kinetics and specific energy consumption during fluidized bed drying of soybean at 80, 100, 120 and 140ºc and airflow rates of 1.8, 3.1 and 4.5 m s-1. six mathematical models for describing the fluidized bed drying behavior were investigated. the value of the drying rate coefficient (k) increased with inc...