A navigation pile, which can be used as a priority queue, is an extension of a selection tree. In a compact form the whole data structure requires only a linear number of bits in addition to the elements stored. In this paper, we study the practical efficiency of three different implementations of navigation piles and compare their efficiency against two implementations of binary heaps. The res...

spm (Sand Pile Model) is a simple discrete dynamical system used in physics to represent granular objects. It is deeply related to integer partitions, and many other combinatorics problems, such as tilings or rewriting systems. The evolution of the system started with n stacked grains generates a lattice, denoted by SPM(n). We study here the structure of this lattice. We rst explain how it can ...

Concrete cylinder piles produced by a centrifugally cast, vibrated, roller-compacted process have shown promising corrosion resistance in marine environments. Three bridges in the Florida panhandle with ~40 years in aggressive marine service and one newly constructed marine bridge utilizing concrete cylinder piles were examined. Examination of the older marine bridges showed minimal corrosion d...

The dynamics of several games on line graphs is studied. Relations between these games and a one-dimensional version of the sand pile model are established. We also study a generalization of the latter model, which we call the ice pile model. Specifically, we investigate the dynamical behavior of all these games and provide closed formulas for the transient time lengths they require to reach th...

to increase the safety of structures against strong ground motions and their life due to environmental issues on the earth and saving in terms of materials, it is necessary to expand and upgrade seismic resistant systems. however, more cost-effective systems which have sufficient influence on the seismic performance of structures and also more compatibility with the regional conditions, will be...

Pennsylvania generates over 50,000 m of spent mushroom substrate (SMS) annually due to production of the white button mushroom Agaricus bisporus (Chong and Hamersma 1997). Improper disposal of this volume of organic waste may cause environmental problems such as air, water and soil pollution. Considering that its major ingredients include incompletely composted straw, hay, manure, gypsum and po...

Partial cutting is required in areas where forest cover must be maintained to meet silvicultural objectives or to support non-timber values. The Okanagan has an arid climate and water quality is often a concern, requiring cut-and-leave patterns to meet hydrological considerations. Large areas of mature pine are harvested in sections (two or more passes) to meet cutblock size and green-up requir...

The spatial distribution and deposition of lead and zinc emitted from the Trail smelter, British Columbia, Canada, was studied by strategically locating moss bags in the area surrounding the smelter and monitoring the deposition of elements every three months. A combined diffusion/distribution model was applied to estimate the relative contribution of stack-emitted material and material emitted...

We introduce a model for granular flow in a one-dimensional rice pile that incorporates rolling effects through a long-range rolling probability for the individual rice grains proportional to r(-rho), r being the distance traveled by a grain in a single toppling event. The exponent rho controls the average rolling distance. We have shown that the crossover from the power law to the stretched ex...

With the popularity of new energy vehicles, a large number cities began to focus on installation electric vehicle charging piles. However, existing intelligent piles have faced problems such as short supply, unreasonable distribution areas, and insufficient power supply. In response these problems, this research proposes recurrent neural network algorithm with an integrated firefly algorithm. B...