Considerable effort has been directed towards the application of percolation theory and fractal modeling to porous media. We combine these areas of research to investigate percolation in prefractal porous media. We estimated percolation thresholds in the pore space of homogeneous random 2-dimensional prefractals as a function of the fractal scale invariance ratio b and iteration level i. The pe...

In this paper, we present a method for speech signal analysis and synthesis based on IFS theory. We consider a speech signal as the graph of a continuous function whose irregularity, measured in terms of its local HH older exponents, is arbitrary. We extract a few remarkable points in the signal and perform a fractal interpolation between them using a classical technique based on IFS theory. We...

In this paper we show that Fractal, a generic component model coming from the Component-Based Software Engineering (CBSE) community, meets most of the functional expectations identified so far in the simulation community for component-based modeling and simulation. We also demonstrate that Fractal offers additional features that have not yet been identified in the simulation community despite t...

The Zarshuran Carlin-like gold deposit is located at the Takab Metallogenic belt in the northern part of the Sanandaj-Sirjan zone, NW Iran. The high-grade ore bodies are mainly hosted by black shale and cream to gray massive limestone along the NNE-trending extensional fault/fracture zones. The aim of this investigation was to determine and separate the gold mineralized stages based on the surf...

Gazestan magnetite-apatite deposit is located in Central Iran and Bafq region, which has been occurred in form of veins, veinlets, and small apatite lenses as well as magnetite in metasomatic rock types such as green chlorite-actinolite rock units. These rocks are situated in the carbonate-volcanic complex of Upper Precambrian-Lower Cambrian Rizo formation. In this study, staged factor analysis...

A fractal is a function or a process in which an identical motif repeats itself on an ever diminishing scale. The motif of a fractal can be a feature influenced by chance. Fractals can be found in nature everywhere, for instance the surface of the moon is a fractal, where the motif of craters is repeated in a scale from inches to miles. It is created by random collisions with space objects. Fra...

Material components for the nuclear fusion and the advanced nuclear fi ssion reactors are exposed to high levels of radiation energy, high temperature, and high thermo-mechanical stresses. Radiation damage is inherently a multiscale phenomenon, with interactions encompassing time scales from femto-seconds to years and length scales from subnanometer to meters. In this study, multiscale modeling...

BACKGROUND AND PURPOSE Cerebral vasospasm (CV) with infarction causes a significant degree of morbidity and mortality after aneurysmal subarachnoid hemorrhage (aSAH). We sought to determine if reduced cerebral blood flow (CBF) on Xenon CT within 48 h of the ictus was predictive of developing CV with infarction. METHODS This is a prospective study from 1999 to 2006 of 97 patients with aSAH who...