In this short note we discuss the shellability of (nonpure) simplicial complexes in terms of acyclic orientations of the facet-ridge incidence graphs, which shows that we can decide shellability only from the facet-ridge incidences and the total number of faces the simplicial complex contains. © 2007 Elsevier B.V. All rights reserved.

Introduction: In recent years, we have seen a tremendous growth in communications devices, such as mobiles and tablets. Also, the appeal to connect to the Internet through wireless systems has increased significantly. Given these changes in everyday life, the approach to cognitive works and problem-solving and decision-making in a complex system that has become increasingly imp...

We evaluate models for the formation of the ridge belt fan assemblage on Venus through consideration of the orientation, spatial distribution, topographic expression and wavelengths of observed tectonic surface features. We favor a compressional mechanism for long wavelength deformation corresponding to the spacing of ridge belts (300_<),<400 kin). However, short wavelength ridges and grooves (...

Internal tides have been implicated as a major source of mechanical energy for mixing in the ocean interior. Indeed, microstructure and tracer measurements have indicated that enhanced turbulence levels occur near topography where internal tides are generated. However, the details of the energy budget and the mechanisms by which energy is transferred from the internal tide to turbulence have be...

The propagation of plane incident waves over a long submerged uniform rectangular structured ridge protruding from the sea bed is considered. comprised closely-spaced array vertical barriers between which fluid allowed to flow. In addition height and width ridge, orientation thickness are adjustable design parameters. Particular interest centres negative refraction obliquely-incident waves, sho...

plane wave Hao-Yuan She, Le-Wei Li, Soo Jin Chua, Wei-Bin Ewe, Olivier J. F. Martin, and Juan R. Mosig Nanoscience and Nanotechnology Initiative and Department of Electrical and Computer Engineering, National University of Singapore, Kent Ridge 119260, Singapore Institute of High Performance Computing, Singapore Science Park II 117528, Singapore Institute for Transmission, Waves and Photonics, ...