Abstract Glide-snow avalanches release due to a loss of friction at the snow–ground interface, which can result in large that endanger infrastructure alpine regions. The underlying processes are still relatively poorly understood, part limited data available on glide processes. Here, we introduce pixel-based algorithm detect cracks time-lapse photographs under changing illumination and shadow c...

We investigated the interaction of intrinsic point defects (vacancies and self-interstitials) with a partial dislocation in silicon. Using a combination of zero-temperature ab initio total energy calculations with finite temperature free-energy calculations based on an interatomic potential, we obtained energies for the relevant core defects. The formation energies of vacancies and interstitial...

We introduce a framework for collision detection between a pair of rigid polyhedra. Given the initial and final positions and orientations of two objects, the algorithm determines whether the bodies collide, and if so, when and where. All the collisions, including collisions at different times are computed at once. This kind of collision information is useful for handling multiple (nearly) conc...

The glide-path scans of the LIDARs at the Hong Kong International Airport (HKIA) are used to calculate the eddy dissipation rate (EDR), the internationally adopted metric for turbulence reporting/alerting, by using the structure function approach based on the radial velocity data. The EDR so determined is compared with the turbulence intensity calculated from the Quick Access Recorder (QAR) dat...

A set of flight tests designed to evaluate the relative utility of candidate displays with advanced symbology for general aviation terminal area instrument flight rules operations are discussed. The symbology was previously evaluated as part of the NASA Langley Research Center's Terminal Configured Vehicle Program for use in commercial airlines. The advanced symbology included vehicle track ang...

In this letter, we propose and study a 2-D glide-symmetric dielectric periodic structure. We demonstrate that glide symmetry broadens the bandwidth of operation achieves lower effective refractive indices when compared to non-glide configurations. These two properties are beneficial for producing graded-index lens antennas. To potential proposed unit cell, designed Luneburg operating in K- K <i...

In this paper we consider the dynamics of dislocations with the same Burgers vector, contained in the same glide plane, and moving in a material with periodic obstacles. We study two cases: i) the particular case of parallel straight dislocations and ii) the general case of curved dislocations. In each case, we perform rigorously the homogenization of the dynamics and predict the corresponding ...