A pump station is a very important flood control facility for mitigating inundation of urban lowland areas. It is not easy to secure a site to increase the capacity of a pump station in an urban area because of various limitations or to maximize the discharge capacity of the pump sump. Adding a facility to improve the pump capacity of a pump station may affect the flow characteristics, such as ...

We present an improved effective action for the D-brane-anti-D-brane system obtained from boundary superstring field theory. Although the action looks highly nontrivial, it has simple explicit multi-vortex (i.e. codimension-2 multi-BPS D-brane) multianti-vortex solutions. The solutions have a curious degeneracy corresponding to different “magnetic” fluxes at the core of each vortex. We also gen...

We fabricated a device that controls the motion of flux quanta in a niobium superconducting film grown on an array of nanoscale triangular pinning potentials. The controllable rectification of the vortex motion is due to the asymmetry of the fabricated magnetic pinning centers. The reversal in the direction of the vortex flow is explained by the interaction between the vortices trapped on the m...

This paper suggests a method to create dark soliton-like waves in a trapped atomic Bose-Einstein condensate (BEC). With the phase imprinting method, a soliton-like disturbance is produced along the x-axis. The method is used in two cases (with and without rotation of a trapping potential). The disturbance in a two-dimensional (2D) system is unstable. The soliton-like perturbation is found to de...

where φ is the angle between the unit vortex line tangent vectors ξ(x−y, t) and ξ(x, t). Some degree of smoothness of the bundle of vortex lines near a potential singularity may result in averting blowup [3]. For simplicity, we’ll discuss Lipschitz continuous cases, although Hölder continuous cases may be analyzed in a similar fashion. We distinguish between the sine-Lipschitz case (i.e. sinφ i...

Hydrodynamic cavitation for the degradation of model dye wastewater containing Auramine O dye was investigated using vortex diode as a cavitating device. The effect of different operating parameters such as inlet pressure, initial dye concentration and flow rate on degradation rate of auramine O was studied in the concentration range of 80 mg/L to 1200 mg/L. The cavitational yield of the cavita...

It has been conjectured that the vortex solution on a D-brane anti-D-brane system represents a D-brane of two lower dimension. We establish this result by first identifying a series of marginal deformations which create the vortex antivortex pair on the brane antibrane system, and then showing that under this series of marginal deformations the original D-brane anti-D-brane system becomes a D-b...

Composite materials based on superparamagnetic magnetite nanoparticles embedded in polyvinylpyrrolidone (PVP) are generated in a continuous flow vortex fluidic device (VFD). The same device is effective in entrapping microalgal cells within this material, such that the functional cells can be retrieved from aqueous dispersions using an external magnet.

It is shown that a pair of vortex and anti-vortex is completely screened in 2 + 1 dimensional Yang-Mills theory and 3 + 1 dimensional Yang-Mills theory in the strong coupling limit, based on the recent conjecture of Maldacena. This is consistent with the fact that these theories exhibit confinement.