Platform Enterprise Business Model: Their Essence and Particularity

Purpose: The purpose of this is present research to explore the essence and particularity of platform enterprise business model. Design/Methodology/Approach: Grounded theory are used to abstract the elements of platform by two step coding, and then social network relation analysis are used for the core modules and their relation of platform enterprise business model. Findings: The present study abstracted four core modules and constructed the platform model structure, and analyzed its essence and particularity. Originality/Value: In most research of business model, the value creation and capture are seen as the core of value logic, while this study found that the value delivery and creation are more important for a platform enterprise business model

Vortex evolution in the near wake behind polygonal cylinders

The near wake of the polygonal cylinder with the side number N = 3~∞ is systematically studied using particle image velocimetry (PIV) at Re = 1.6 × 104. The proper orthogonal decomposition (POD) analysis is carried out to extract the large-scale coherent vortex structures and their evolution. It has been found that the vortex circulation grows to the maximum at the vortex formation length by entraining the vorticity from the separated shear layer and then undergoes a two-stage decay. The maximum circulation scales with the wake width, defined as the vertical distance between the two peaks of streamwise velocity fluctuation at vortex formation length. The vortex center trajectory indicates that the vortices move towards the centerline first and then away, with the vortex size monotonically increasing over the examined streamwise range. The vortex size at the maximum circulation also scales with the wake width. The vortex convection velocity increases gradually in the streamwise direction, and the ratio of the lateral and streamwise components of the vortex convection velocity, when scaled by wake width and vortex formation length respectively, approaches asymptotically 0.18 in the downstream, irrespective of the cylinder orientation or N