نتایج جستجو برای: fractal theories

تعداد نتایج: 143297  

2002
Nemanja POPRŽEN Mićo GAĆANOVIĆ

1 University of Banjaluka, Faculty of Electrical Engineering, Patre 5, 78000 Banjaluka, Bosnia and Herzegovina, E-mail: nemanjapoprzen@gmail 2 University of Banjaluka, Faculty of Electrical Engineering, Patre 5, 78000 Banjaluka, Bosnia and Herzegovina, E-mail: [email protected] Abstract: This report will describe the theories and techniques for shrinking the size of an antenna through the use of ...

2011
Sandeep k. Agrawal V. Chaurasia A. Somkuwar

Fractal Image compression is a ground-breaking image compression technique in the area of image processing. This technique is based on fractals rather than pixels. It is advantageous in compression ratio, decompression speed, bitrate and resolution independence. But in conjunction with above advantages, the encoding phase of this technique consumes huge time, which is a major drawback and restr...

2001
G. Erdös Z. Németh

___________________ Correspondence to: G. Erd V ([email protected]) Abstract. The heliospheric magnetic field is rich in highly fragmented small-scale structures. The magnetic background strongly influences the motion of the charged particles of relatively low rigidity. Using high time resolution magnetic field data measured by the magnetometer onboard Ulysses, we study the small-scale magneti...

2018
Yanguang Chen

A fractal is in essence a hierarchy with cascade structure, which can be described with a set of exponential functions. From these exponential functions, a set of power laws indicative of scaling can be derived. Hierarchy structure and spatial network proved to be associated with one another. This paper is devoted to exploring the theory of fractal analysis of complex systems by means of hierar...

Journal: :Physical review 2021

In this Letter, we study two-dimensional Floquet conformal field theory, where the external periodic driving is described by iterated logistic or tent maps. These maps are known to be typical examples of dynamical systems exhibiting order-chaos transition, and show that, as a result such driving, entanglement entropy scaling develops fractal features when corresponding system approaches chaotic...

Hamid Pashaei Adl, Samad Roshan Entezar,

In this paper, the optical properties of one dimensional fractal structures are investigated. We consider six typical fractal photonic structures: the symmetric dual cantor-like fractal structure, the asymmetric dual cantor-like fractal structure, the single cantor-like fractal structure, the symmetric dual golden-section fractal structure, the asymmetric dual golden-section fractal structure a...

2004
Arash Yavari

The size effect on structural strength is an important phenomenon with a very old history. Unfortunately, despite abundant experimental evidence, this phenomenon is still not taken into account in most specifications of the design codes for concrete structures, as well as the design practices for polymer composites, rock masses and timber. The main reason appears to be a controversy between two...

2004
Arash Yavari

The size effect on structural strength is an important phenomenon with a very old history. Unfortunately, despite abundant experimental evidence, this phenomenon is still not taken into account in most specifications of the design codes for concrete structures, as well as the design practices for polymer composites, rock masses and timber. The main reason appears to be a controversy between two...

Journal: :journal of advanced materials and processing 0
maryam shojaie bahaabad department of chemical and materialas engineering, shahrood university of technology, shahrood, iran

in this work, sio2 –zro2 mixed oxides was prepared by the polymeric sol–gel route. the characterization of pore structure, which determines the permeation process of membrane, is of great importance. so far, most investigations have focused on such pore structure as specific surface area and pore size distribution, but the surface fractal, the important parameter reflecting the roughness of por...

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